:root{--brand:#10b981;--brand-dark:#047857;--ink:#071711;--muted:#5f756b;--soft:#edfdf4;--soft-2:#f8fffb;--line:#c9f1db;--warning:#8a4b05;--warning-bg:#fff7e8;--card:#fff;--shadow:0 22px 70px rgba(7,23,17,.11);--shadow-soft:0 10px 32px rgba(7,23,17,.08);--radius:28px;--container:1120px;--wide:1220px}*{box-sizing:border-box}html{scroll-behavior:smooth;max-width:100%;overflow-x:hidden}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:#fff;max-width:100%;overflow-x:hidden}a{color:inherit;text-decoration:none}a:hover{color:var(--brand-dark)}p{line-height:1.72}img,svg{max-width:100%}button,input,select,textarea{font:inherit}.skip-link{position:absolute;left:-999px;top:8px;background:#fff;border:1px solid var(--line);padding:8px 12px;border-radius:999px;z-index:30}.skip-link:focus{left:8px}.container{width:min(var(--container),calc(100% - 40px));margin:auto}.container-wide{width:min(var(--wide),calc(100% - 40px));margin:auto}.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.header-inner{width:min(1280px,calc(100% - 34px));margin:auto;display:flex;align-items:center;gap:18px;min-height:72px}.brand{display:inline-flex;align-items:center;gap:10px;font-size:1.18rem;font-weight:950;color:var(--brand-dark);white-space:nowrap}.brand-mark,.icon-badge{display:inline-grid;place-items:center;width:28px;height:28px;border:1px solid #a8ebc8;border-radius:10px;background:linear-gradient(135deg,#f8fffb,#defbea);color:var(--brand-dark);font-weight:950}.mobile-menu-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:999px;padding:9px 14px;font-weight:850}.main-nav{margin-left:auto;display:flex;align-items:center;gap:8px}.nav-link,.nav-button{display:inline-flex;align-items:center;gap:7px;border:0;background:transparent;border-radius:999px;padding:9px 12px;font-weight:850;color:#101d17;cursor:pointer}.nav-link.active,.nav-button:hover,.nav-link:hover{background:var(--soft);color:#065f46}.nav-item{position:relative}.mega-menu{display:none;position:absolute;right:0;top:calc(100% + 12px);width:min(840px,calc(100vw - 36px));grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:14px}.mega-link{display:block;border:1px solid var(--line);background:linear-gradient(180deg,#fff,var(--soft-2));border-radius:18px;padding:13px;min-height:82px}.mega-link strong{display:block;color:#052016}.mega-link span{display:block;margin-top:5px;color:var(--muted);font-size:.88rem;line-height:1.35}.header-actions{display:flex;margin-left:12px}.lang-pill,.pill{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);background:#fff;border-radius:999px;padding:10px 18px;font-weight:850;box-shadow:var(--shadow-soft)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;border:1px solid var(--line);background:#fff;color:#0b1711;border-radius:999px;padding:14px 22px;font-weight:950;cursor:pointer;box-shadow:var(--shadow-soft)}.btn.primary{background:linear-gradient(135deg,#11c784,#059669);border-color:transparent;color:#fff;box-shadow:0 18px 42px rgba(16,185,129,.28)}.btn.small{padding:10px 14px;font-size:.92rem}.hero-actions,.cta-row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}.hero-shell{position:relative;overflow:hidden;background:linear-gradient(180deg,#f0fff8 0%,#fff 74%);border-bottom:1px solid var(--line)}.hero-shell:before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(16,185,129,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(16,185,129,.08) 1px,transparent 1px);background-size:34px 34px;mask-image:linear-gradient(#000,transparent 82%)}.hero-inner{position:relative;padding:70px 0 58px;text-align:center}.breadcrumbs{display:flex;justify-content:center;gap:6px;flex-wrap:wrap;color:var(--muted);font-weight:750;margin-bottom:18px}.breadcrumbs a{color:#076c50}.hero-chips,.trust-row{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-bottom:18px}.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:8px 13px;font-weight:850;color:#064e3b;box-shadow:var(--shadow-soft)}h1{font-size:clamp(3.4rem,8vw,7rem);line-height:.96;margin:0 auto 22px;letter-spacing:-.07em;max-width:1050px}h2{font-size:clamp(2rem,4vw,3.4rem);line-height:1.02;letter-spacing:-.045em;margin:0 0 16px}h3{font-size:1.28rem;margin:0 0 10px}.lead{font-size:clamp(1.08rem,1.6vw,1.35rem);max-width:800px;margin:0 auto 26px;color:var(--muted)}.section{padding:70px 0}.section-tight{padding:44px 0}.section-head{text-align:center;max-width:820px;margin:0 auto 34px}.section-head p{color:var(--muted);font-size:1.05rem}.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-soft);min-width:0}.soft-card{background:linear-gradient(180deg,#fff,var(--soft-2));border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-soft)}.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.stack{display:grid;gap:22px}.single-column{max-width:980px;margin:auto}.mini-label{display:inline-flex;border:1px solid #a8ebc8;background:var(--soft);color:#065f46;border-radius:999px;padding:7px 12px;font-weight:950;margin-bottom:14px}.field{width:100%;border:1px solid var(--line);border-radius:18px;padding:15px 17px;background:#fff;color:#13231b}.inputbar{display:grid;grid-template-columns:1fr auto auto;gap:12px;max-width:850px;margin:24px auto}.player-window{max-width:960px;height:480px;margin:26px auto 0;border-radius:28px;background:linear-gradient(135deg,#07111e,#14253a);box-shadow:0 34px 80px rgba(7,17,30,.32);display:grid;place-items:center;color:#bfe6d1;border:1px solid rgba(255,255,255,.08)}.play-triangle{font-size:4rem;opacity:.55}.playlist-tabs{max-width:960px;margin:20px auto 0;background:#fff;border:1px solid var(--line);border-radius:28px;padding:16px;box-shadow:var(--shadow-soft)}.tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;background:#e8f5ee;border-radius:999px;padding:5px}.tabs button{border:0;background:transparent;border-radius:999px;padding:11px;font-weight:900}.tabs button.active{background:#fff;box-shadow:var(--shadow-soft)}.empty-state{min-height:150px;display:grid;place-items:center;text-align:center;color:var(--muted)}.ad-safe{border:1px dashed #a8ebc8;background:linear-gradient(135deg,#f7fffb,#effdf5);color:#4a675b;border-radius:22px;min-height:86px;display:grid;place-items:center;font-weight:850}.feature-card .icon-big{font-size:1.65rem;margin-bottom:12px}.tool-directory{display:grid;gap:18px}.tool-group{background:#fff;border:1px solid var(--line);border-radius:30px;padding:26px;box-shadow:var(--shadow-soft)}.tool-list{display:grid;grid-template-columns:1fr;gap:12px;margin-top:16px}.tool-link{display:grid;grid-template-columns:190px 1fr auto;gap:16px;align-items:center;border:1px solid var(--line);background:linear-gradient(180deg,#fff,var(--soft-2));border-radius:20px;padding:16px 18px}.tool-link strong{font-size:1.05rem}.tool-link span{color:var(--muted);line-height:1.45}.notice{border:1px solid #f1d19b;background:var(--warning-bg);color:var(--warning);border-radius:22px;padding:17px 20px;margin:22px auto 0;max-width:850px}.tool-panel{max-width:900px;margin:auto;background:#fff;border:1px solid var(--line);border-radius:32px;padding:30px;box-shadow:var(--shadow)}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.form-grid .full{grid-column:1/-1}.status-box{border:1px dashed #a8ebc8;background:#f4fff8;border-radius:24px;min-height:145px;padding:24px;color:#557166}.process{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.process .step{background:#fff;border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:var(--shadow-soft)}.step-num{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--brand);color:#fff;font-weight:950;margin-bottom:12px}.decision-table{overflow:auto;border:1px solid var(--line);border-radius:24px;background:#fff;box-shadow:var(--shadow-soft)}table{width:100%;border-collapse:collapse;min-width:720px}th,td{text-align:left;padding:17px 18px;border-bottom:1px solid var(--line);vertical-align:top}th{background:var(--soft);font-weight:950}tr:last-child td{border-bottom:0}.share-strip{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;background:#fff;border:1px solid var(--line);border-radius:24px;padding:18px;box-shadow:var(--shadow-soft)}.share-strip a,.share-strip button{border:1px solid var(--line);background:var(--soft-2);border-radius:999px;padding:10px 14px;font-weight:850;color:#064e3b}.article-list{display:grid;gap:16px}.article-card{display:block;background:#fff;border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:var(--shadow-soft)}.article-meta{display:flex;gap:10px;flex-wrap:wrap;color:#60766b;font-size:.92rem;font-weight:750}.article-body{max-width:850px;margin:auto}.article-body p,.article-body li{font-size:1.06rem;color:#33483f;line-height:1.82}.article-body ul,.article-body ol{padding-left:24px}.quick-answer{background:linear-gradient(180deg,#fff,var(--soft));border:1px solid var(--line);border-radius:28px;padding:26px;margin:28px 0}.toc-inline{display:flex;gap:10px;flex-wrap:wrap;border:1px solid var(--line);background:#fff;border-radius:24px;padding:16px;margin:24px 0}.toc-inline a{font-weight:850;color:#065f46}.footer-cta{background:linear-gradient(135deg,#e9fff3,#fff);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:54px 0;text-align:center}.site-footer{background:#05140e;color:#d9fff0;padding:48px 0 28px}.footer-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:24px}.footer-grid h3{font-size:1rem;color:#fff;margin:0 0 12px}.footer-grid a{display:block;color:#b8dccd;margin:9px 0;font-size:.92rem}.footer-brand{display:flex;justify-content:space-between;gap:20px;align-items:center;border-top:1px solid rgba(255,255,255,.12);margin-top:34px;padding-top:22px;color:#b8dccd}.footer-brand strong{color:#fff}.muted{color:var(--muted)}.hide{display:none!important}
@media(max-width:1100px){.header-actions{display:none}.nav-link,.nav-button{padding:8px 9px;font-size:.9rem}.footer-grid{grid-template-columns:repeat(3,1fr)}.grid-3,.process{grid-template-columns:repeat(2,1fr)}}
@media(max-width:820px){.header-inner{flex-wrap:wrap;min-height:auto;padding:12px 0}.mobile-menu-toggle{display:inline-flex;margin-left:auto}.main-nav{display:none;flex:1 0 100%;flex-wrap:wrap;margin:0;gap:8px;padding:8px 0}.main-nav.open{display:flex}.nav-item{position:static}.mega-menu{position:static;width:100%;box-shadow:none;border-radius:20px;grid-template-columns:1fr}.nav-item.open .mega-menu{display:none}.header-actions{display:flex;margin-left:0}.hero-inner{padding:44px 0}.inputbar{grid-template-columns:1fr}.player-window{height:300px}.grid-2,.grid-3,.form-grid,.process{grid-template-columns:1fr}.tool-link{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.tabs{grid-template-columns:1fr;border-radius:20px}.container,.container-wide{width:min(100% - 28px,var(--container))}h1{font-size:clamp(2.75rem,15vw,4.8rem)}}
@media(max-width:540px){.footer-grid{grid-template-columns:1fr}.footer-brand{display:block}.player-window{height:240px}.tool-panel{padding:20px;border-radius:24px}.card,.soft-card{padding:22px}.btn{width:100%}.hero-actions{width:100%}.inputbar .btn{width:100%}.share-strip{justify-content:stretch}.share-strip a,.share-strip button{flex:1;text-align:center}.site-footer{padding-bottom:18px}}


/* V4.7 core page operational polish */
.site-header{box-shadow:0 1px 0 rgba(6,95,70,.04)}
.header-inner{min-height:70px}.nav-button.active{background:var(--soft);color:#065f46}.compact-mega{grid-template-columns:repeat(4,minmax(0,1fr));width:min(980px,calc(100vw - 40px));left:auto;right:0}.compact-mega .mega-link{min-height:74px;padding:12px}.compact-mega .mega-link span{font-size:.84rem}.home-hero .hero-inner{padding-top:68px}.hero-inputbar{grid-template-columns:1fr auto auto auto;max-width:930px}.icon-only{width:54px;padding:0}.hero-player{height:520px;max-width:980px}.refined-tabs{max-width:980px}.clean-ad{min-height:74px;border-style:solid;background:#f8fffb;color:#739082}.feature-row .card{text-align:center}.embed-console,.download-console,.conversion-console{background:#fff;border:1px solid var(--line);border-radius:34px;padding:30px;box-shadow:var(--shadow);display:grid;gap:18px}.console-head{display:flex;justify-content:space-between;align-items:center;gap:14px}.input-row{display:grid;grid-template-columns:1fr auto;gap:12px}.compact-controls{margin-top:6px}.inline-details{border:1px solid var(--line);border-radius:22px;padding:14px 16px;background:var(--soft-2)}.inline-details summary{font-weight:950;color:#065f46;cursor:pointer}.queue-preview{border:1px dashed #9be7bd;background:#f6fff9;border-radius:26px;min-height:170px;padding:18px}.code-card{display:block;width:100%;white-space:pre-wrap;word-break:break-word;background:#06180f;color:#ceffe8;border:1px solid rgba(255,255,255,.08);border-radius:22px;padding:18px;overflow:auto}.code-output{font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.mini-table table{min-width:0}.mini-table th{width:180px}.primary-tool-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.tool-tile{display:block;background:#fff;border:1px solid var(--line);border-radius:28px;padding:24px;box-shadow:var(--shadow-soft);min-height:190px}.tool-tile.large{grid-column:span 2;min-height:240px;background:linear-gradient(180deg,#fff,#f3fff9)}.tool-tile span{display:inline-flex;border:1px solid #a8ebc8;background:var(--soft);border-radius:999px;padding:7px 11px;color:#065f46;font-weight:950;margin-bottom:14px}.tool-tile h3{font-size:1.55rem}.tool-tile b{display:inline-flex;margin-top:12px;color:#047857}.content-split{display:grid;grid-template-columns:1.1fr .9fr;gap:30px;align-items:center}.visual-card{background:#062116;color:#d9fff0;border-radius:32px;padding:26px;box-shadow:var(--shadow)}.compact-diagram{display:grid;gap:14px}.diagram-row{display:grid;grid-template-columns:180px 1fr;gap:16px;border:1px solid rgba(255,255,255,.12);border-radius:18px;padding:15px;background:rgba(255,255,255,.04)}.diagram-row span{color:#aee9ca}.image-steps .step{min-height:210px}.group-head{display:flex;justify-content:space-between;gap:20px;align-items:flex-start}.refined-directory .tool-group{padding:30px}.polished-list .article-card h2{font-size:clamp(1.6rem,3vw,2.4rem);margin:12px 0}.read-more{display:inline-flex;margin-top:10px;color:#047857;font-weight:950}.compact-hero .hero-inner{padding:58px 0 50px}.compact-hero h1{font-size:clamp(3.2rem,7vw,6.2rem)}.compact-hero .lead{max-width:860px}.share-strip.useful-share{margin-top:22px}.decision-table table{font-size:.98rem}
@media(max-width:1100px){.compact-mega{grid-template-columns:repeat(2,minmax(0,1fr));}.primary-tool-grid{grid-template-columns:repeat(2,minmax(0,1fr));}.content-split{grid-template-columns:1fr}.hero-player{height:440px}}
@media(max-width:820px){.hero-inputbar,.input-row{grid-template-columns:1fr}.compact-mega{grid-template-columns:1fr}.primary-tool-grid{grid-template-columns:1fr}.tool-tile.large{grid-column:auto}.group-head{display:block}.compact-hero h1{font-size:clamp(2.7rem,14vw,4.3rem)}.hero-player{height:320px}.mini-table th{width:auto}.diagram-row{grid-template-columns:1fr}}
@media(max-width:540px){.hero-player{height:250px}.embed-console,.download-console,.conversion-console{padding:20px;border-radius:26px}.hero-chips{gap:7px}.chip{padding:7px 10px}.inputbar{margin-top:18px}.compact-hero .hero-inner{padding:42px 0}.footer-grid{grid-template-columns:1fr}.process.image-steps .step{min-height:auto}}


/* V4.8 long-tail tool page polish */
.operational-tool{display:grid;gap:22px}.tool-form{margin-top:8px}.status-pill{display:inline-flex;border:1px solid #a8ebc8;background:#ecfdf5;color:#065f46;border-radius:999px;padding:9px 13px;font-weight:950;white-space:nowrap}.rich-status{min-height:96px;display:block;color:#31594a}.command-output{display:grid;gap:12px}.faq-stack details summary{cursor:pointer}.refined-related .tool-link{background:#fff}.refined-directory .tool-group{margin-bottom:22px}.refined-directory .tool-group h2{margin-bottom:8px}.tool-group .group-head{margin-bottom:18px}.tool-panel .cta-row{margin-top:8px}.tool-panel textarea.field{resize:vertical}.quick-answer ul{margin:0;padding-left:24px}.quick-answer li{margin:8px 0;line-height:1.7}.section .grid-3.feature-row .card{min-height:210px}.image-steps.process{grid-template-columns:repeat(4,minmax(0,1fr))}.compact-hero h1{max-width:980px}.compact-hero .notice{margin-top:24px}.decision-table td:first-child{font-weight:800;color:#0b241a}.ad-safe.clean-ad{box-shadow:none}.tool-list.refined-related{margin-top:0}
@media(max-width:1000px){.image-steps.process{grid-template-columns:repeat(2,minmax(0,1fr))}.tool-panel .console-head{align-items:flex-start}.status-pill{margin-top:4px}}
@media(max-width:640px){.image-steps.process{grid-template-columns:1fr}.tool-panel .console-head{display:block}.status-pill{margin:10px 0 0}.compact-hero h1{letter-spacing:-.055em}.tool-form{grid-template-columns:1fr}.section .grid-3.feature-row .card{min-height:auto}}


/* V4.9 page-by-page UA/UI polish */
.grouped-mega{display:grid;grid-template-columns:repeat(4,minmax(180px,1fr));gap:12px;max-width:980px;padding:18px}.mega-column{display:grid;gap:8px;align-content:start}.mega-column>span{font-size:12px;font-weight:950;color:#047857;text-transform:uppercase;letter-spacing:.08em;padding:0 8px}.mega-column .mega-link{display:grid;gap:2px;padding:9px 10px;border-radius:14px;text-decoration:none}.mega-column .mega-link small{color:#5b7168;line-height:1.35;font-size:12px}.simplified-footer{grid-template-columns:repeat(6,minmax(0,1fr))}.reference-hero{padding-top:76px;padding-bottom:60px}.polished-tool-panel{display:grid;gap:22px;border-radius:30px}.tool-panel-head{display:flex;justify-content:space-between;gap:20px;align-items:flex-start}.tool-panel-head h2{font-size:clamp(28px,3vw,44px);letter-spacing:-.045em;margin:8px 0 8px}.tool-panel-head p{max-width:760px;color:#52665e;font-size:18px;line-height:1.7}.polished-form{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.status-pill{display:inline-flex;border:1px solid #a8ebc8;background:#ecfdf5;color:#065f46;border-radius:999px;padding:9px 14px;font-weight:950;white-space:nowrap}.useful-card-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.mini-card{background:#fff;border:1px solid rgba(6,95,70,.14);box-shadow:0 18px 50px rgba(4,120,87,.08);border-radius:24px;padding:24px}.mini-card strong{display:block;font-size:20px;color:#09261d;margin-bottom:8px}.mini-card p{color:#5b7168;line-height:1.7;margin:0}.timeline-list{counter-reset:item;list-style:none;margin:0;padding:0;display:grid;gap:14px}.timeline-list li{display:grid;grid-template-columns:220px 1fr;gap:16px;padding:20px;border:1px solid rgba(6,95,70,.14);border-radius:22px;background:#fff}.timeline-list strong{color:#063f2f;font-size:18px}.timeline-list span{color:#5b7168;line-height:1.7}.polished-boundary{border-left:0;background:linear-gradient(135deg,#ecfdf5,#fff);border:1px solid rgba(16,185,129,.28)}.polished-boundary ul{margin:0;padding-left:22px}.polished-boundary li{margin:8px 0;line-height:1.7}.polished-table table{font-size:15px}.polished-faq .card{padding:0}.polished-faq summary{padding:18px 22px;cursor:pointer}.polished-faq p{padding:0 22px 20px}.tool-card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.tool-card-op{display:grid;gap:9px;background:#fff;border:1px solid rgba(6,95,70,.14);border-radius:24px;padding:22px;text-decoration:none;min-height:190px;box-shadow:0 18px 50px rgba(4,120,87,.07)}.tool-card-op span{font-size:12px;font-weight:950;color:#047857;text-transform:uppercase;letter-spacing:.08em}.tool-card-op strong{font-size:21px;color:#071a14}.tool-card-op p{color:#60746c;line-height:1.62;margin:0}.tool-card-op b{margin-top:auto;color:#059669}.tool-family{display:grid;gap:18px;margin-bottom:34px}.tool-directory-stack{display:grid;gap:12px}.rich-status{min-height:92px;line-height:1.65}.cta-row{flex-wrap:wrap}.share-strip.useful-share{justify-content:center}.refined-related .tool-link{background:#fff}
@media(max-width:1100px){.grouped-mega{grid-template-columns:repeat(2,minmax(0,1fr));max-width:720px}.simplified-footer{grid-template-columns:repeat(3,minmax(0,1fr))}.tool-card-grid,.useful-card-row{grid-template-columns:repeat(2,minmax(0,1fr))}.timeline-list li{grid-template-columns:1fr}}
@media(max-width:720px){.grouped-mega{grid-template-columns:1fr;max-width:min(92vw,420px)}.polished-form,.tool-card-grid,.useful-card-row{grid-template-columns:1fr}.tool-panel-head{display:grid}.simplified-footer{grid-template-columns:repeat(2,minmax(0,1fr))}.reference-hero{padding-top:54px}.polished-tool-panel{border-radius:22px}.tool-card-op{min-height:auto}.hero-actions .btn{width:100%;justify-content:center}.share-strip.useful-share{justify-content:flex-start;overflow-x:auto}.polished-table{overflow-x:auto}.polished-table table{min-width:620px}}
@media(max-width:460px){.simplified-footer{grid-template-columns:1fr}.timeline-list li{padding:16px}.tool-panel-head h2{font-size:30px}.tool-panel-head p{font-size:16px}.reference-hero h1{font-size:clamp(44px,16vw,68px)}}


/* V5.0 remaining tool-page polish */
.conversion-panel{position:relative;overflow:hidden}.conversion-panel:before{content:"";position:absolute;inset:0 0 auto auto;width:220px;height:220px;background:radial-gradient(circle,rgba(16,185,129,.14),transparent 65%);pointer-events:none}.conversion-panel>*{position:relative}.reference-hero .breadcrumbs{justify-content:center}.reference-hero .lead{max-width:900px}.polished-form label{font-weight:850;color:#0a2b20;display:grid;gap:8px}.polished-form .field{font-weight:600}.rich-status strong{color:#064e3b}.rich-status .muted{color:#63786f}.clean-ad{max-width:980px;margin:auto}.useful-card-row .mini-card{min-height:170px}.timeline-list li{align-items:start}.polished-boundary h2{margin-top:0}.polished-boundary ul{display:grid;gap:4px}.refined-related{grid-template-columns:repeat(2,minmax(0,1fr))}.refined-related .tool-link{border:1px solid rgba(6,95,70,.14)}.status-pill{align-self:start}.main-nav .nav-link,.nav-button{white-space:nowrap}
@media(max-width:900px){.refined-related{grid-template-columns:1fr}.tool-panel-head{grid-template-columns:1fr}.status-pill{width:max-content}.reference-hero .breadcrumbs{justify-content:flex-start}.reference-hero .hero-actions{justify-content:flex-start!important}.reference-hero .hero-actions .btn{width:auto}}
@media(max-width:560px){.reference-hero .hero-actions .btn{width:100%}.polished-form label{font-size:14px}.status-pill{font-size:13px}.useful-card-row .mini-card{min-height:auto}.refined-related .tool-link{grid-template-columns:1fr}.site-footer .footer-grid{gap:18px}}


/* V5.1 core-route visual unification pass */
body{background:linear-gradient(180deg,#f9fffc 0,#fff 560px)}
.site-header{box-shadow:0 10px 30px rgba(5,20,14,.045)}
.header-inner{gap:14px}.brand-mark{box-shadow:inset 0 0 0 1px rgba(255,255,255,.6)}
.nav-link,.nav-button{font-size:14px;padding:9px 11px}.lang-pill{padding:9px 14px}
.grouped-mega{max-height:78vh;overflow:auto}.mega-column .mega-link{min-height:auto}.mega-link:hover{border-color:#8de8ba;background:#f2fff8;color:#064e3b}
.hero-shell{background:radial-gradient(circle at 50% 0,rgba(16,185,129,.18),transparent 34%),linear-gradient(180deg,#f2fff8 0%,#fff 76%)}
.hero-inner{padding-top:64px}.compact-hero .hero-inner{padding-top:60px}.reference-hero{padding-top:62px}
h1{max-width:1000px}.compact-hero h1,.reference-hero h1{font-size:clamp(3rem,6.2vw,5.7rem);letter-spacing:-.06em}.lead{color:#4f665d}
.hero-chips{margin-bottom:16px}.chip{box-shadow:none;background:rgba(255,255,255,.88)}
.inputbar{box-shadow:0 18px 55px rgba(4,120,87,.08);border:1px solid rgba(16,185,129,.16);border-radius:26px;padding:10px;background:#fff}.inputbar .field{border-color:transparent;background:#f8fffb}.inputbar .btn{box-shadow:none}.hero-inputbar{max-width:900px}
.player-window{height:min(500px,52vw);min-height:360px;border-radius:34px;position:relative;overflow:hidden}.player-window:before{content:"";position:absolute;left:24px;right:24px;bottom:24px;height:8px;border-radius:999px;background:linear-gradient(90deg,#10b981 0 32%,rgba(255,255,255,.16) 32%)}.player-window:after{content:"";position:absolute;left:24px;top:22px;width:92px;height:12px;border-radius:999px;background:rgba(255,255,255,.12)}
.playlist-tabs{border-radius:26px}.tabs{background:#edf8f2}.empty-state{min-height:112px}.section{padding:68px 0}.section-tight{padding:34px 0}.section-head{margin-bottom:28px}.section-head h2{max-width:900px;margin-left:auto;margin-right:auto}.section-head p{max-width:780px;margin-left:auto;margin-right:auto}.card,.soft-card,.tool-panel,.tool-group,.article-card{box-shadow:0 18px 45px rgba(5,31,20,.06)}
.content-split{grid-template-columns:1fr;max-width:980px;margin:auto}.visual-card{margin-top:16px}.diagram-row{grid-template-columns:1fr 1fr}
.tool-panel{max-width:980px}.polished-tool-panel{gap:20px}.tool-panel-head{border-bottom:1px solid rgba(6,95,70,.12);padding-bottom:18px}.tool-panel-head h2{font-size:clamp(2rem,4vw,3.4rem)}.status-pill{background:#f3fff8;color:#047857;border-color:#b9efd1}.rich-status{background:linear-gradient(180deg,#f6fffa,#fff);border-style:solid}.form-grid{align-items:start}
.process .step{min-height:0}.timeline-list li{background:linear-gradient(180deg,#fff,#fbfffd)}.decision-table{box-shadow:0 18px 45px rgba(5,31,20,.055)}
.share-strip.useful-share{max-width:980px;margin-left:auto;margin-right:auto}.share-strip a,.share-strip button{box-shadow:none}.tool-card-op:hover,.tool-link:hover,.article-card:hover,.tool-tile:hover{transform:translateY(-2px);transition:.18s ease;box-shadow:0 24px 55px rgba(4,120,87,.12)}
.footer-cta{padding:46px 0}.site-footer{padding-top:42px}.footer-grid a{padding:4px 0;color:#c8f8e5}.footer-brand{border-top:1px solid rgba(255,255,255,.12);margin-top:28px;padding-top:20px;color:#aee7cf}
@media(max-width:980px){.main-nav{gap:5px}.nav-link,.nav-button{padding:8px 9px}.header-actions{margin-left:4px}.player-window{min-height:320px}.diagram-row{grid-template-columns:1fr}.tool-panel-head{display:grid}.status-pill{width:max-content}}
@media(max-width:820px){.site-header{position:sticky}.main-nav.open{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-items:stretch}.main-nav.open .nav-item{grid-column:1/-1}.main-nav.open .nav-link,.main-nav.open .nav-button{justify-content:center;background:#fff;border:1px solid var(--line)}.inputbar{display:grid;grid-template-columns:1fr;padding:8px}.player-window{height:320px;min-height:280px}.footer-grid.simplified-footer{grid-template-columns:repeat(2,minmax(0,1fr))}.section{padding:52px 0}}
@media(max-width:520px){.container,.container-wide{width:min(100% - 24px,var(--container))}.compact-hero h1,.reference-hero h1,h1{font-size:clamp(2.55rem,14vw,4.1rem);letter-spacing:-.052em}.lead{font-size:1.02rem}.player-window{height:250px;min-height:240px;border-radius:26px}.footer-grid.simplified-footer{grid-template-columns:1fr}.card,.soft-card,.tool-panel,.tool-group{padding:22px;border-radius:24px}.btn{width:100%}.cta-row .btn{width:100%}.hero-actions{justify-content:stretch}.hero-actions .btn{width:100%}}

.public-route-strip{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;background:#fff;border:1px solid var(--line);border-radius:26px;padding:14px;box-shadow:var(--shadow-soft)}.public-route-strip a{display:grid;gap:5px;border-radius:18px;padding:16px;background:linear-gradient(180deg,#fff,#f7fffb)}.public-route-strip strong{color:#064e3b;font-size:1.05rem}.public-route-strip span{color:#61766d;line-height:1.45}@media(max-width:820px){.public-route-strip{grid-template-columns:1fr 1fr}}@media(max-width:520px){.public-route-strip{grid-template-columns:1fr}}


.site-header .nav-item.menu-open > .mega-menu{display:grid!important;}
.site-header .nav-item.menu-open > .nav-button{background:var(--soft);color:#065f46;}
@media(max-width:820px){
  .site-header .nav-item .mega-menu{display:none!important;}
  .site-header .nav-item.menu-open > .mega-menu{display:grid!important;}
}


/* V5.3 global page UA/UI continuity polish */
.site-header .nav-item .mega-menu{display:none!important;}
.site-header .nav-item.menu-open > .mega-menu{display:grid!important;}
.site-header .nav-item.menu-open > .nav-button{background:var(--soft);color:#065f46;}
.grouped-mega{width:min(1040px,calc(100vw - 36px));grid-template-columns:repeat(4,minmax(0,1fr));align-items:start;}
.mega-column{display:grid;gap:10px;align-content:start;}
.mega-column>span{display:inline-flex;width:max-content;max-width:100%;border:1px solid #a8ebc8;background:#f0fff8;color:#065f46;border-radius:999px;padding:6px 10px;font-size:.82rem;font-weight:950;}
.mega-link{min-height:auto;}
.mega-link small{display:block;margin-top:5px;color:var(--muted);font-size:.84rem;line-height:1.35;}
.reference-single-flow{max-width:980px;margin:auto;display:grid;gap:22px;}
.reference-single-flow .visual-card{width:100%;}
.flow-card{display:grid;gap:12px;border:1px solid var(--line);background:linear-gradient(180deg,#fff,var(--soft-2));border-radius:26px;padding:24px;box-shadow:var(--shadow-soft);}
.flow-line{display:grid;grid-template-columns:160px 1fr;gap:16px;align-items:start;border-top:1px solid var(--line);padding-top:14px;}
.flow-line:first-child{border-top:0;padding-top:0;}
.flow-line b{color:#064e3b;}
.page-continuity-note{max-width:960px;margin:0 auto 28px;border:1px solid var(--line);background:linear-gradient(135deg,#f8fffb,#fff);border-radius:24px;padding:18px 20px;color:#3f5b50;box-shadow:var(--shadow-soft);}
.page-continuity-note strong{color:#064e3b;}
.article-card strong,.tool-link b{white-space:nowrap;}
@media(max-width:980px){.grouped-mega{grid-template-columns:repeat(2,minmax(0,1fr));}.flow-line{grid-template-columns:1fr;gap:6px}.article-card strong,.tool-link b{white-space:normal;}}
@media(max-width:820px){.site-header .nav-item .mega-menu{display:none!important;position:static;width:100%;box-shadow:none;margin-top:8px;border-radius:18px;}.site-header .nav-item.menu-open > .mega-menu{display:grid!important;}.grouped-mega{grid-template-columns:1fr}.nav-button{width:100%;justify-content:center}.header-actions{margin-left:0}.lang-pill{padding:9px 14px}.main-nav.open{align-items:stretch}.main-nav.open .nav-link,.main-nav.open .nav-button{justify-content:center}}
@media(max-width:520px){.inputbar{grid-template-columns:1fr}.tabs{grid-template-columns:1fr;border-radius:20px}.tool-link{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.section{padding:52px 0}h1{font-size:clamp(2.6rem,14vw,4rem)}}

/* V5.4 full-screen adaptive stage polish
   Goal: stop the prototype from feeling like a narrow centered column.
   Public tool pages should behave closer to a YouTube-like responsive stage:
   wide on desktop/4K, controlled on laptop, readable on mobile. */
:root{
  --container:1640px;
  --wide:1880px;
  --stage-pad:clamp(16px,2.4vw,56px);
  --tool-stage:1480px;
  --player-stage:1500px;
  --reading-measure:920px;
}
.container{width:min(calc(100% - (var(--stage-pad) * 2)),var(--container));}
.container-wide,.header-inner{width:min(calc(100% - (var(--stage-pad) * 2)),var(--wide));}
.header-inner{max-width:none;}
.hero-inner{padding-left:0;padding-right:0;}
h1{max-width:min(1280px,100%);} 
.lead{max-width:min(980px,100%);} 
.hero-inputbar,.inputbar{max-width:min(1180px,100%);} 
.player-window{max-width:min(var(--player-stage),100%);height:clamp(360px,42vw,760px);} 
.playlist-tabs{max-width:min(var(--player-stage),100%);} 
.tool-panel,.polished-tool-panel{max-width:min(var(--tool-stage),100%);} 
.single-column,.reference-single-flow{max-width:min(var(--tool-stage),100%);} 
.content-split{max-width:min(var(--tool-stage),100%);} 
.tool-directory{max-width:min(var(--tool-stage),100%);margin-left:auto;margin-right:auto;} 
.tool-group{width:100%;}
.tool-list{width:100%;}
.tool-link{grid-template-columns:minmax(190px,270px) 1fr auto;}
.form-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
.status-box{min-height:180px;}
.process{grid-template-columns:repeat(4,minmax(0,1fr));}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr));}
.public-route-strip{max-width:min(var(--tool-stage),100%);margin-left:auto;margin-right:auto;}
.share-strip.useful-share,.share-strip{max-width:min(var(--tool-stage),100%);margin-left:auto;margin-right:auto;}
.decision-table{max-width:100%;}
.article-body{max-width:var(--reading-measure);} 
.article-list,.content-index,.topic-map{max-width:min(var(--tool-stage),100%);margin-left:auto;margin-right:auto;}
.footer-grid{grid-template-columns:repeat(6,minmax(0,1fr));}

@media (min-width:1440px){
  .section{padding:84px 0;}
  .section-tight{padding:52px 0;}
  .hero-inner{padding-top:82px;padding-bottom:72px;}
  .compact-hero h1,.reference-hero h1,h1{font-size:clamp(4rem,6.6vw,7.4rem);} 
  .tool-panel{padding:38px;}
  .card,.soft-card,.tool-group{padding:32px;}
  .hero-actions,.cta-row{gap:14px;}
}
@media (min-width:1800px){
  .container{width:min(calc(100% - 112px),1740px);} 
  .container-wide,.header-inner{width:min(calc(100% - 112px),1920px);} 
  .player-window{height:clamp(560px,38vw,820px);} 
  .playlist-tabs{margin-top:24px;}
  .tool-panel,.single-column,.reference-single-flow,.tool-directory,.content-split{max-width:1540px;}
}
@media (max-width:1180px){
  .container,.container-wide,.header-inner{width:min(calc(100% - 32px),100%);} 
  .tool-link{grid-template-columns:1fr auto;}
  .tool-link span{grid-column:1/-1;}
  .process{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-grid{grid-template-columns:repeat(3,minmax(0,1fr));}
}
@media (max-width:820px){
  :root{--stage-pad:16px;}
  .container,.container-wide,.header-inner{width:calc(100% - 24px);} 
  .form-grid,.grid-2,.grid-3,.process,.public-route-strip{grid-template-columns:1fr;} 
  .tool-link{grid-template-columns:1fr;} 
  .player-window{height:clamp(260px,68vw,420px);min-height:260px;} 
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (max-width:520px){
  .container,.container-wide,.header-inner{width:calc(100% - 20px);} 
  .footer-grid{grid-template-columns:1fr;} 
  .player-window{height:clamp(230px,72vw,340px);min-height:230px;} 
  .tool-panel,.card,.soft-card,.tool-group{padding:20px;} 
}

/* V5.5 YouTube-like fluid stage refinement
   The previous full-screen pass made the site wider, but some core routes still felt like centered forms.
   This pass treats the public tool pages as fluid stages: wide on 1440/1920/4K, readable on tablet, single-column on mobile. */
:root{
  --container:1760px;
  --wide:2040px;
  --stage-pad:clamp(16px,2.2vw,64px);
  --tool-stage:1680px;
  --player-stage:1780px;
  --reading-measure:920px;
}
.container{width:min(calc(100% - (var(--stage-pad) * 2)),var(--container));}
.container-wide,.header-inner{width:min(calc(100% - (var(--stage-pad) * 2)),var(--wide));max-width:none;}
.home-hero .container,.compact-hero .container,.reference-hero .container{width:min(calc(100% - (var(--stage-pad) * 2)),var(--wide));}
.home-hero .hero-inner{min-height:clamp(760px,92svh,1040px);display:flex;flex-direction:column;justify-content:center;}
.hero-inner{padding-top:clamp(54px,6vw,96px);padding-bottom:clamp(46px,5vw,82px);}
h1{max-width:min(1380px,100%);font-size:clamp(3.6rem,6.8vw,7.8rem);}
.compact-hero h1,.reference-hero h1{max-width:min(1320px,100%);}
.lead{max-width:min(1080px,100%);}
.hero-inputbar,.inputbar{max-width:min(1380px,100%);grid-template-columns:minmax(0,1fr) auto auto auto;}
.home-hero .player-window,.compact-hero .player-window,.hero-player{width:100%;max-width:min(var(--player-stage),100%);height:auto;aspect-ratio:16/7.6;min-height:clamp(360px,42vw,780px);max-height:min(82svh,840px);}
.playlist-tabs{width:100%;max-width:min(var(--player-stage),100%);}
.tool-panel,.polished-tool-panel,.embed-console{width:100%;max-width:min(var(--tool-stage),100%);}
.single-column,.reference-single-flow,.content-split,.tool-directory,.public-route-strip,.share-strip.useful-share{max-width:min(var(--tool-stage),100%);}
.section-head{max-width:min(1120px,100%);}
.section-head p{max-width:min(980px,100%);}
.page-continuity-note,.notice{max-width:min(var(--tool-stage),100%);}
.grid-3.feature-row,.primary-tool-grid,.grid-3,.grid-2,.process{max-width:min(var(--tool-stage),100%);margin-left:auto;margin-right:auto;}
.tool-link{grid-template-columns:minmax(190px,300px) minmax(0,1fr) auto;}
.form-grid{grid-template-columns:minmax(0,1.15fr) minmax(300px,.85fr);}
.form-grid .full{grid-column:1/-1;}
.status-box{min-height:clamp(180px,18vw,280px);}
.decision-table{max-width:min(var(--tool-stage),100%);margin-left:auto;margin-right:auto;}
.article-body{max-width:var(--reading-measure);}
.article-list{max-width:min(var(--tool-stage),100%);}
.footer-grid{grid-template-columns:repeat(6,minmax(0,1fr));gap:clamp(18px,2vw,34px);}
.footer-cta .container{max-width:min(1320px,calc(100% - (var(--stage-pad) * 2)));}

@media(min-width:1800px){
  :root{--stage-pad:56px;--player-stage:1880px;--tool-stage:1760px;}
  .home-hero .player-window,.compact-hero .player-window,.hero-player{min-height:clamp(600px,38vw,860px);}
  .section{padding-top:96px;padding-bottom:96px;}
  .section-tight{padding-top:56px;padding-bottom:56px;}
}
@media(max-width:1280px){
  .hero-inputbar,.inputbar{grid-template-columns:minmax(0,1fr) auto auto;}
  .inputbar .btn:nth-of-type(3){grid-column:auto;}
  .form-grid{grid-template-columns:1fr 1fr;}
  .tool-link{grid-template-columns:1fr auto;}
  .tool-link span{grid-column:1/-1;}
}
@media(max-width:920px){
  .home-hero .hero-inner{min-height:auto;}
  .hero-inputbar,.inputbar,.form-grid,.grid-2,.grid-3,.process,.primary-tool-grid,.public-route-strip{grid-template-columns:1fr;}
  .home-hero .player-window,.compact-hero .player-window,.hero-player{aspect-ratio:16/10;min-height:clamp(260px,64vw,460px);max-height:none;}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media(max-width:560px){
  :root{--stage-pad:12px;}
  .container,.container-wide,.header-inner,.home-hero .container,.compact-hero .container,.reference-hero .container{width:calc(100% - 20px);}
  h1{font-size:clamp(2.55rem,13vw,4.15rem);}
  .home-hero .player-window,.compact-hero .player-window,.hero-player{min-height:230px;border-radius:24px;}
  .tabs{grid-template-columns:1fr;border-radius:22px;}
  .footer-grid{grid-template-columns:1fr;}
}


/* V5.6 self-audit + full-screen route polish
   Rule: the assistant must self-check layout risks before handoff.
   User review is final product judgement, not the first QA layer.
   Layout target: YouTube-like fluid stage on desktop/4K, single-column readable on mobile. */
:root{
  --container:2400px;
  --wide:2600px;
  --tool-stage:2240px;
  --player-stage:2480px;
  --stage-pad:clamp(12px,1.5vw,72px);
  --reading-measure:960px;
}
.container,
.container-wide,
.header-inner,
.home-hero .container,
.compact-hero .container,
.reference-hero .container{
  width:min(calc(100% - (var(--stage-pad) * 2)),var(--container));
  max-width:none;
}
.header-inner{width:min(calc(100% - (var(--stage-pad) * 2)),var(--wide));}
.home-hero .hero-inner{
  min-height:min(1080px,calc(100svh - 72px));
  padding-top:clamp(56px,5.5vw,96px);
  padding-bottom:clamp(48px,5vw,90px);
}
.hero-inner{padding-left:0;padding-right:0;}
h1{max-width:min(1500px,100%);}
.compact-hero h1,.reference-hero h1{max-width:min(1500px,100%);}
.lead{max-width:min(1180px,100%);}
.hero-inputbar,.inputbar{max-width:min(1500px,100%);}
.home-hero .player-window,.compact-hero .player-window,.reference-hero .player-window,.hero-player{
  width:100%;
  max-width:min(var(--player-stage),100%);
  aspect-ratio:16/7.4;
  min-height:clamp(400px,42vw,900px);
  height:auto;
}
.playlist-tabs{max-width:min(var(--player-stage),100%);width:100%;}
.tool-panel,.polished-tool-panel,.embed-console,.download-console,.conversion-console{
  width:100%;
  max-width:min(var(--tool-stage),100%);
  margin-left:auto;
  margin-right:auto;
}
.single-column,.reference-single-flow,.content-split,.tool-directory,.public-route-strip,.share-strip.useful-share,.share-strip,.page-continuity-note,.notice{
  max-width:min(var(--tool-stage),100%);
}
.section-head{max-width:min(1240px,100%);}
.section-head h2{max-width:min(1180px,100%);}
.section-head p{max-width:min(1040px,100%);}
.grid-3.feature-row,.primary-tool-grid,.grid-3,.grid-2,.process,.tool-card-grid,.useful-card-row,.article-list,.content-index,.topic-map{
  max-width:min(var(--tool-stage),100%);
  margin-left:auto;
  margin-right:auto;
}
.download-console .input-row,.conversion-console .input-row,.embed-console .input-row{
  grid-template-columns:minmax(0,1fr) auto;
}
.form-grid,.polished-form{
  grid-template-columns:repeat(2,minmax(0,1fr));
}
.queue-preview,.rich-status,.status-box{min-height:clamp(180px,16vw,320px);}
.footer-grid,.footer-grid.simplified-footer{grid-template-columns:repeat(6,minmax(0,1fr));}
.site-header .nav-item .mega-menu{display:none!important;}
.site-header .nav-item.menu-open > .mega-menu{display:grid!important;}
.site-header .nav-item:not(.menu-open) > .mega-menu{display:none!important;}
@media(min-width:1800px){
  :root{--stage-pad:64px;--container:3000px;--wide:3200px;--player-stage:2880px;--tool-stage:2600px;}
  .home-hero .player-window,.compact-hero .player-window,.reference-hero .player-window,.hero-player{min-height:clamp(640px,37vw,980px);}
  .section{padding-top:104px;padding-bottom:104px;}
  .section-tight{padding-top:60px;padding-bottom:60px;}
  .tool-panel,.download-console,.conversion-console,.embed-console{padding:clamp(34px,2.4vw,56px);}
}
@media(max-width:1180px){
  .container,.container-wide,.header-inner,.home-hero .container,.compact-hero .container,.reference-hero .container{width:calc(100% - 32px);}
  .footer-grid,.footer-grid.simplified-footer{grid-template-columns:repeat(3,minmax(0,1fr));}
  .form-grid,.polished-form{grid-template-columns:1fr 1fr;}
}
@media(max-width:920px){
  :root{--stage-pad:16px;}
  .home-hero .hero-inner{min-height:auto;}
  .hero-inputbar,.inputbar,.download-console .input-row,.conversion-console .input-row,.embed-console .input-row,.form-grid,.polished-form,.grid-2,.grid-3,.process,.primary-tool-grid,.tool-card-grid,.useful-card-row,.public-route-strip{grid-template-columns:1fr;}
  .home-hero .player-window,.compact-hero .player-window,.reference-hero .player-window,.hero-player{aspect-ratio:16/10;min-height:clamp(260px,64vw,480px);}
  .footer-grid,.footer-grid.simplified-footer{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media(max-width:560px){
  :root{--stage-pad:10px;}
  .container,.container-wide,.header-inner,.home-hero .container,.compact-hero .container,.reference-hero .container{width:calc(100% - 20px);}
  .home-hero .player-window,.compact-hero .player-window,.reference-hero .player-window,.hero-player{min-height:230px;border-radius:24px;}
  .footer-grid,.footer-grid.simplified-footer{grid-template-columns:1fr;}
}


/* V5.7 player stage + self-audit polish
   Purpose: continue AI-owned page checks and make the public player stage feel operational, not like a static card. */
.player-window{position:relative;overflow:hidden;padding:0;align-items:stretch;justify-items:stretch;background:radial-gradient(circle at 50% 42%,rgba(16,185,129,.16),transparent 28%),linear-gradient(135deg,#07111e,#0b1c14 55%,#13283d);}
.player-stage-inner{width:100%;min-height:100%;display:grid;grid-template-rows:auto 1fr auto;color:#d7f8e7;}
.player-topbar{display:flex;align-items:center;gap:10px;padding:16px clamp(18px,2vw,30px);border-bottom:1px solid rgba(255,255,255,.08);background:rgba(255,255,255,.035);}
.player-topbar .dot{width:10px;height:10px;border-radius:50%;background:#34d399;box-shadow:0 0 18px rgba(52,211,153,.45);}
.player-topbar strong{margin-left:8px;letter-spacing:.01em;}
.player-state-text{margin-left:auto;color:#9fe6c2;font-weight:850;font-size:.92rem;}
.player-center{display:grid;place-items:center;text-align:center;padding:clamp(34px,6vw,90px) 20px;}
.player-center .play-triangle{font-size:clamp(4.2rem,8vw,8rem);line-height:1;opacity:.72;filter:drop-shadow(0 18px 45px rgba(16,185,129,.22));}
.player-center p{margin:10px auto 0;max-width:900px;}
.player-main-copy{font-size:clamp(1.2rem,2vw,2rem);font-weight:900;color:#ecfff5;}
.player-current-url{color:#a7d7c0!important;overflow-wrap:anywhere;}
.player-controls{padding:18px clamp(18px,2vw,34px) 22px;border-top:1px solid rgba(255,255,255,.08);background:linear-gradient(180deg,rgba(0,0,0,.02),rgba(0,0,0,.24));}
.player-track{height:7px;background:rgba(255,255,255,.14);border-radius:999px;overflow:hidden;}
.player-track span{display:block;width:18%;height:100%;background:linear-gradient(90deg,#34d399,#10b981);box-shadow:0 0 24px rgba(52,211,153,.35);}
.player-control-row{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:12px;color:#bee7d0;font-size:.92rem;font-weight:850;}
.route-audit-strip{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;max-width:min(var(--tool-stage),100%);margin:auto;}
.route-audit-strip a{display:grid;gap:7px;border:1px solid var(--line);background:linear-gradient(180deg,#fff,#f6fffb);border-radius:22px;padding:18px 20px;box-shadow:var(--shadow-soft);}
.route-audit-strip strong{color:#064e3b;font-size:1.02rem;}
.route-audit-strip span{color:#60756d;line-height:1.45;}
.route-audit-strip a:hover{transform:translateY(-2px);transition:.18s ease;box-shadow:0 22px 52px rgba(4,120,87,.12);}
.core-self-check-note{border:1px solid var(--line);background:#fff;border-radius:24px;padding:18px 20px;box-shadow:var(--shadow-soft);color:#4d665d;}
@media(max-width:920px){.route-audit-strip{grid-template-columns:1fr 1fr}.player-topbar{padding:13px 16px}.player-control-row{font-size:.84rem}}
@media(max-width:560px){.route-audit-strip{grid-template-columns:1fr}.player-state-text{display:none}.player-center{padding:38px 14px}.player-topbar strong{font-size:.92rem}}


/* V5.8 downloader/converter operation-stage polish
   Goal: public tool pages should feel like full-width operational stages, not narrow forms.
   Scope: downloader and converter operation areas only; no new public columns. */
.tool-stage-section{padding-top:clamp(44px,5vw,88px);padding-bottom:clamp(56px,6vw,108px);background:linear-gradient(180deg,#f5fffb 0%,#ffffff 58%,#f7fffb 100%);}
.operation-stage{width:100%;max-width:min(var(--tool-stage),100%);margin:0 auto;border:1px solid rgba(16,185,129,.24);border-radius:clamp(28px,2.4vw,44px);background:linear-gradient(135deg,rgba(255,255,255,.98),rgba(236,253,245,.78));box-shadow:0 30px 90px rgba(6,95,70,.11);padding:clamp(24px,3vw,58px);position:relative;overflow:hidden;}
.operation-stage:before{content:"";position:absolute;inset:-30% auto auto -12%;width:42%;height:82%;background:radial-gradient(circle,rgba(16,185,129,.12),transparent 62%);pointer-events:none;}
.stage-toolbar{position:relative;display:flex;align-items:flex-start;justify-content:space-between;gap:28px;margin-bottom:clamp(24px,3vw,42px);}
.stage-toolbar h2{font-size:clamp(2.1rem,3.9vw,4.8rem);line-height:.98;margin:.22em 0 .16em;letter-spacing:-.05em;max-width:1200px;}
.stage-toolbar p{max-width:1050px;font-size:clamp(1rem,1.2vw,1.25rem);line-height:1.7;}
.stage-toolbar>strong{white-space:nowrap;border:1px solid rgba(16,185,129,.25);background:#ecfdf5;color:#065f46;border-radius:999px;padding:12px 18px;box-shadow:0 10px 28px rgba(16,185,129,.1);}
.stage-grid{position:relative;display:grid;grid-template-columns:minmax(0,1.18fr) minmax(420px,.82fr);gap:clamp(22px,2.8vw,52px);align-items:stretch;}
.stage-primary-panel,.stage-result-panel{border:1px solid rgba(16,185,129,.2);background:rgba(255,255,255,.92);border-radius:clamp(24px,2vw,36px);padding:clamp(22px,2.3vw,42px);box-shadow:0 18px 48px rgba(6,95,70,.08);}
.stage-primary-panel{display:grid;gap:clamp(18px,2vw,28px);}
.stage-result-panel{display:grid;gap:20px;align-content:start;background:linear-gradient(180deg,rgba(255,255,255,.92),rgba(236,253,245,.72));}
.result-head{display:flex;justify-content:space-between;gap:14px;align-items:center;}
.large-field{min-height:62px;font-size:1.05rem;border-radius:24px;}
.primary-action-row{display:flex;flex-wrap:wrap;gap:12px;align-items:center;}
.stage-settings-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;}
.stage-settings-grid label,.field-stack label{display:grid;gap:8px;font-weight:850;color:#123429;}
.stage-details{border:1px solid rgba(16,185,129,.22);background:#f1fff8;border-radius:22px;padding:14px 16px;}
.stage-code{min-height:118px;border-radius:24px;background:#051b13;color:#d7f8e7;white-space:pre-wrap;overflow-wrap:anywhere;}
.stage-queue{min-height:clamp(260px,18vw,420px);display:grid;place-items:center;border:1px dashed rgba(16,185,129,.35);border-radius:26px;background:rgba(240,253,244,.55);padding:20px;text-align:center;}
.stage-queue .article-list{display:grid;gap:14px;width:100%;}
.stage-queue .article-card{padding:18px;border-radius:20px;text-align:left;}
.boundary-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;}
.boundary-grid div{border:1px solid rgba(16,185,129,.22);background:#ecfdf5;border-radius:20px;padding:15px;display:grid;gap:6px;}
.boundary-grid strong{color:#065f46;}
.boundary-grid span{color:#546a60;line-height:1.45;}
.stage-route-bar{position:relative;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:clamp(18px,2.2vw,34px);}
.stage-route-bar a{border:1px solid rgba(16,185,129,.22);background:#fff;border-radius:22px;padding:18px 20px;display:grid;gap:6px;box-shadow:0 14px 36px rgba(6,95,70,.07);}
.stage-route-bar strong{color:#064e3b;}
.stage-route-bar span{color:#60756d;line-height:1.45;}
.conversion-route-visual{min-height:220px;border-radius:28px;background:linear-gradient(135deg,#03150e,#08291c);color:#d7f8e7;padding:clamp(20px,2.2vw,34px);display:grid;grid-template-columns:1fr 36px 1fr 36px 1fr;align-items:center;gap:14px;box-shadow:inset 0 0 0 1px rgba(255,255,255,.08);}
.conversion-route-visual div{border:1px solid rgba(52,211,153,.22);background:rgba(255,255,255,.06);border-radius:24px;padding:18px;display:grid;gap:7px;text-align:center;}
.conversion-route-visual b{display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:#34d399;color:#052e21;margin:0 auto 4px;}
.conversion-route-visual i{height:2px;background:linear-gradient(90deg,transparent,#34d399,transparent);}
.mini-table table{width:100%;}
@media(max-width:1180px){.stage-grid{grid-template-columns:1fr}.stage-result-panel{min-height:auto}.boundary-grid{grid-template-columns:repeat(3,minmax(0,1fr));}}
@media(max-width:760px){.stage-toolbar{display:grid}.stage-settings-grid,.stage-route-bar,.boundary-grid{grid-template-columns:1fr}.conversion-route-visual{grid-template-columns:1fr}.conversion-route-visual i{height:20px;width:2px;margin:auto;background:linear-gradient(180deg,transparent,#34d399,transparent)}.operation-stage{padding:18px;border-radius:26px}.stage-primary-panel,.stage-result-panel{padding:18px;border-radius:24px}.primary-action-row .btn{width:100%;justify-content:center}}

/* V6.1 core-route single-column theater polish
   Purpose: keep the YouTube-like wide stage while removing the remaining side-by-side operation layout on core tool routes.
   Rule: public tool pages use one vertical product story: hero, operation stage, result preview, proof/boundary cards, workflow, FAQ. */
:root{
  --container:1920px;
  --wide:2240px;
  --tool-stage:1880px;
  --player-stage:2080px;
  --stage-pad:clamp(14px,1.9vw,72px);
  --reading-measure:960px;
}
.container,
.container-wide,
.header-inner,
.home-hero .container,
.compact-hero .container,
.reference-hero .container{
  width:min(calc(100% - (var(--stage-pad) * 2)),var(--container));
  max-width:none;
}
.header-inner{width:min(calc(100% - (var(--stage-pad) * 2)),var(--wide));}
.home-hero .hero-inner{min-height:clamp(760px,calc(100svh - 72px),1080px);}
.compact-hero .hero-inner,.reference-hero .hero-inner{min-height:clamp(430px,50svh,760px);}
.hero-shell.compact-hero h1,.hero-shell.reference-hero h1{max-width:min(1500px,100%);}
.hero-shell.compact-hero .lead,.hero-shell.reference-hero .lead{max-width:min(1180px,100%);}
.player-window,.hero-player{max-width:min(var(--player-stage),100%);}
.tool-stage-section{padding-top:clamp(44px,5vw,90px);padding-bottom:clamp(56px,6vw,110px);}
.operation-stage{max-width:min(var(--tool-stage),100%);padding:clamp(24px,3.2vw,64px);}
.stage-toolbar{margin-bottom:clamp(26px,3vw,48px);align-items:center;}
.stage-toolbar h2{max-width:1500px;}
.stage-toolbar p{max-width:1260px;}
.stage-grid{grid-template-columns:1fr!important;gap:clamp(20px,2.6vw,44px)!important;}
.stage-primary-panel,.stage-result-panel{width:100%;}
.stage-primary-panel{max-width:none;}
.stage-result-panel{display:grid;grid-template-columns:minmax(0,1fr);align-content:start;}
.stage-result-panel .result-head{align-items:center;}
.stage-queue{min-height:clamp(220px,20vw,420px);}
.boundary-grid{grid-template-columns:repeat(3,minmax(0,1fr));}
.stage-route-bar{max-width:min(var(--tool-stage),100%);grid-template-columns:repeat(3,minmax(0,1fr));}
.stage-settings-grid{grid-template-columns:repeat(4,minmax(180px,1fr));}
.converter-stage .stage-settings-grid{grid-template-columns:repeat(4,minmax(180px,1fr));}
.conversion-route-visual{min-height:clamp(180px,18vw,320px);grid-template-columns:1fr 44px 1fr 44px 1fr;}
.page-continuity-note{max-width:min(1320px,100%);font-size:1rem;}
.process,.grid-3,.primary-tool-grid,.tool-directory,.public-route-strip,.route-audit-strip{max-width:min(var(--tool-stage),100%);}
.footer-grid,.footer-grid.simplified-footer{grid-template-columns:repeat(6,minmax(0,1fr));}
.site-header .nav-item .mega-menu{display:none!important;}
.site-header .nav-item.menu-open > .mega-menu{display:grid!important;}
.site-header .nav-item:not(.menu-open) > .mega-menu{display:none!important;}
@media(min-width:1800px){
  :root{--container:2140px;--wide:2400px;--tool-stage:2080px;--player-stage:2260px;--stage-pad:64px;}
  .section{padding-top:96px;padding-bottom:96px;}
  .section-tight{padding-top:56px;padding-bottom:56px;}
  .operation-stage{padding:clamp(42px,3vw,72px);}
}
@media(max-width:1280px){
  .stage-settings-grid,.converter-stage .stage-settings-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .stage-route-bar,.boundary-grid{grid-template-columns:repeat(3,minmax(0,1fr));}
  .footer-grid,.footer-grid.simplified-footer{grid-template-columns:repeat(3,minmax(0,1fr));}
}
@media(max-width:920px){
  :root{--stage-pad:16px;}
  .home-hero .hero-inner,.compact-hero .hero-inner,.reference-hero .hero-inner{min-height:auto;}
  .stage-toolbar{display:grid;align-items:start;}
  .stage-settings-grid,.converter-stage .stage-settings-grid,.stage-route-bar,.boundary-grid,.conversion-route-visual{grid-template-columns:1fr;}
  .conversion-route-visual i{height:20px;width:2px;margin:auto;background:linear-gradient(180deg,transparent,#34d399,transparent);}
  .footer-grid,.footer-grid.simplified-footer{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media(max-width:560px){
  :root{--stage-pad:10px;}
  .operation-stage{padding:18px;border-radius:26px;}
  .stage-primary-panel,.stage-result-panel{padding:18px;border-radius:22px;}
  .footer-grid,.footer-grid.simplified-footer{grid-template-columns:1fr;}
}

/* V6.1 screenshot-driven core-route refinement
   Scope: core pages only. Bring tool action stages into the first viewport, keep large-screen theater width, and keep mobile readable.
   This is a public layout continuity rule. */
.compact-hero .hero-inner,
.reference-hero .hero-inner{
  min-height:0!important;
  padding-top:clamp(38px,4.2vw,72px)!important;
  padding-bottom:clamp(30px,3.4vw,52px)!important;
}
.compact-hero h1,
.reference-hero h1{
  font-size:clamp(3.45rem,6.1vw,6.35rem)!important;
  line-height:.98;
  max-width:min(1420px,100%);
  margin-bottom:clamp(14px,1.4vw,22px);
}
.compact-hero .lead,
.reference-hero .lead{
  max-width:min(1160px,100%);
  margin-bottom:clamp(18px,1.7vw,26px);
}
.compact-hero .hero-chips,
.reference-hero .hero-chips{
  margin-bottom:clamp(12px,1.3vw,18px);
}
.compact-hero .notice,
.reference-hero .notice{
  margin-top:clamp(14px,1.6vw,22px);
  max-width:min(1120px,100%);
}
.compact-hero + .section-tight,
.reference-hero + .section-tight{
  padding-top:clamp(22px,2.3vw,36px)!important;
  padding-bottom:clamp(10px,1.2vw,18px)!important;
}
.tool-stage-section{
  padding-top:clamp(24px,2.6vw,42px)!important;
  padding-bottom:clamp(48px,5vw,96px)!important;
}
.operation-stage{
  border-radius:clamp(28px,2.2vw,40px);
  padding:clamp(24px,2.7vw,54px)!important;
}
.stage-toolbar{
  margin-bottom:clamp(20px,2.2vw,36px)!important;
}
.stage-toolbar h2{
  font-size:clamp(2.25rem,3.45vw,4.9rem)!important;
  max-width:min(1320px,100%);
}
.stage-toolbar p{
  max-width:min(1160px,100%);
}
.stage-primary-panel,.stage-result-panel{
  padding:clamp(20px,2vw,36px)!important;
}
.stage-settings-grid,
.converter-stage .stage-settings-grid{
  grid-template-columns:repeat(4,minmax(160px,1fr));
}
.stage-queue{
  min-height:clamp(170px,14vw,320px)!important;
}
.boundary-grid div,.stage-route-bar a{
  min-height:0;
}
/* keep the home/player theater large, but reduce first-screen waste on small laptops */
@media(max-width:1540px){
  .home-hero .hero-inner{min-height:clamp(720px,calc(100svh - 72px),980px)!important;}
  .home-hero .player-window,.compact-hero .player-window,.reference-hero .player-window,.hero-player{min-height:clamp(420px,38vw,700px)!important;}
}
@media(max-width:1280px){
  .stage-settings-grid,.converter-stage .stage-settings-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media(max-width:920px){
  .compact-hero .hero-inner,.reference-hero .hero-inner{padding-top:38px!important;padding-bottom:34px!important;}
  .compact-hero h1,.reference-hero h1{font-size:clamp(3rem,13vw,4.6rem)!important;}
  .compact-hero + .section-tight,.reference-hero + .section-tight{padding-top:18px!important;padding-bottom:4px!important;}
  .tool-stage-section{padding-top:22px!important;}
  .stage-toolbar h2{font-size:clamp(2rem,9.5vw,3.8rem)!important;}
  .stage-settings-grid,.converter-stage .stage-settings-grid{grid-template-columns:1fr;}
  .stage-queue{min-height:190px!important;}
}
@media(max-width:560px){
  .compact-hero h1,.reference-hero h1{font-size:clamp(2.75rem,12vw,3.6rem)!important;}
  .compact-hero .notice,.reference-hero .notice{font-size:.93rem;padding:14px 16px;}
  .page-continuity-note{font-size:.92rem;padding:14px 16px;}
}

/* V6.1 pass 2: remove redundant route-note gap on core tool routes and restore compact mobile player height. */
.compact-hero + .section-tight,
.reference-hero + .section-tight{
  display:none!important;
}
.compact-hero .hero-inner,
.reference-hero .hero-inner{
  padding-top:clamp(34px,3.8vw,64px)!important;
  padding-bottom:clamp(26px,3vw,44px)!important;
}
.compact-hero h1,
.reference-hero h1{
  font-size:clamp(3.25rem,5.7vw,6rem)!important;
}
.tool-stage-section{
  padding-top:clamp(24px,2.4vw,40px)!important;
}
@media(max-width:920px){
  .home-hero .player-window,.compact-hero .player-window,.reference-hero .player-window,.hero-player{
    aspect-ratio:16/10!important;
    min-height:clamp(250px,64vw,460px)!important;
  }
  .compact-hero .hero-inner,.reference-hero .hero-inner{padding-top:34px!important;padding-bottom:30px!important;}
}
@media(max-width:560px){
  .home-hero .player-window,.compact-hero .player-window,.reference-hero .player-window,.hero-player{min-height:230px!important;}
}

/* V6.1 core route first-viewport polish
   Goal: keep the YouTube-like adaptive stage but stop core pages from wasting the first viewport.
   The first screen must show the main action area, not only a tall headline. */
.home-hero .hero-inner{
  min-height:auto!important;
  padding-top:clamp(44px,4.2vw,72px)!important;
  padding-bottom:clamp(34px,3.2vw,58px)!important;
}
.home-hero h1{
  font-size:clamp(3.65rem,5.65vw,6.45rem)!important;
  line-height:.96!important;
  max-width:min(1360px,100%)!important;
  margin-bottom:clamp(12px,1.2vw,18px)!important;
}
.home-hero .lead{
  max-width:min(1040px,100%)!important;
  margin-bottom:clamp(18px,1.6vw,24px)!important;
  line-height:1.55!important;
}
.home-hero .hero-chips{margin-bottom:clamp(10px,1vw,15px)!important;}
.home-hero .inputbar,.home-hero .hero-inputbar{
  max-width:min(960px,100%)!important;
  margin-top:clamp(16px,1.4vw,22px)!important;
  margin-bottom:clamp(18px,1.6vw,24px)!important;
}
.home-hero .player-window,.home-hero .hero-player{
  max-width:min(1280px,100%)!important;
  min-height:clamp(420px,32vw,560px)!important;
  aspect-ratio:16/7.4!important;
}
.refined-tabs,.playlist-tabs{max-width:min(1280px,100%)!important;}

.compact-hero .hero-inner,
.reference-hero .hero-inner{
  min-height:0!important;
  padding-top:clamp(26px,3vw,46px)!important;
  padding-bottom:clamp(22px,2.4vw,36px)!important;
}
.compact-hero h1,
.reference-hero h1{
  font-size:clamp(2.95rem,4.85vw,5.25rem)!important;
  line-height:.98!important;
  margin-bottom:clamp(10px,1vw,16px)!important;
  max-width:min(1260px,100%)!important;
}
.compact-hero .lead,
.reference-hero .lead{
  max-width:min(1040px,100%)!important;
  font-size:clamp(1rem,1.28vw,1.18rem)!important;
  line-height:1.48!important;
  margin-bottom:clamp(12px,1.2vw,18px)!important;
}
.compact-hero .hero-chips,
.reference-hero .hero-chips{margin-bottom:clamp(8px,.9vw,12px)!important;}
.compact-hero .chip,
.reference-hero .chip{padding:6px 11px!important;}
.compact-hero .hero-actions,
.reference-hero .hero-actions{gap:10px!important;}
.compact-hero .btn,
.reference-hero .btn{padding:12px 18px!important;}
.compact-hero .notice,
.reference-hero .notice{
  margin-top:clamp(10px,1.1vw,15px)!important;
  padding:11px 16px!important;
  line-height:1.42!important;
  max-width:min(1080px,100%)!important;
}
.compact-hero + .section-tight,
.reference-hero + .section-tight{display:none!important;}
.tool-stage-section{
  padding-top:clamp(16px,1.8vw,28px)!important;
  padding-bottom:clamp(42px,4.4vw,82px)!important;
}
.operation-stage{
  padding:clamp(20px,2.3vw,42px)!important;
}
.stage-toolbar{margin-bottom:clamp(16px,1.8vw,28px)!important;}
.stage-toolbar h2{
  font-size:clamp(2rem,3.05vw,4rem)!important;
  margin:.12em 0 .12em!important;
}
.stage-toolbar p{
  font-size:clamp(.98rem,1.08vw,1.12rem)!important;
  line-height:1.55!important;
}
.stage-primary-panel,.stage-result-panel{padding:clamp(18px,1.8vw,30px)!important;}
.stage-settings-grid,.converter-stage .stage-settings-grid{gap:12px!important;}
.large-field{min-height:54px!important;}
.stage-queue{min-height:clamp(150px,12vw,260px)!important;}
.stage-route-bar{margin-top:clamp(14px,1.5vw,24px)!important;}

/* Tools directory first-screen density */
.tool-directory-stack{display:grid;gap:clamp(34px,4vw,64px)!important;}
.tool-family .section-head{margin-bottom:clamp(18px,2vw,28px)!important;}
.tool-card-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;max-width:min(var(--tool-stage),100%);margin:auto;}
.tool-card-op{display:grid;gap:9px;border:1px solid var(--line);background:#fff;border-radius:24px;padding:20px;box-shadow:var(--shadow-soft);min-height:176px;}
.tool-card-op span{color:#047857;font-size:.8rem;font-weight:950;text-transform:uppercase;letter-spacing:.04em;}
.tool-card-op strong{font-size:1.28rem;line-height:1.08;}
.tool-card-op p{margin:0;color:var(--muted);line-height:1.45;}
.tool-card-op b{color:#047857;margin-top:auto;}

@media(max-width:1280px){.tool-card-grid{grid-template-columns:repeat(3,minmax(0,1fr));}}
@media(max-width:920px){
  .home-hero .hero-inner{padding-top:34px!important;padding-bottom:30px!important;}
  .home-hero h1{font-size:clamp(3rem,12vw,4.6rem)!important;}
  .home-hero .player-window,.home-hero .hero-player{min-height:clamp(250px,62vw,440px)!important;aspect-ratio:16/10!important;}
  .tool-card-grid{grid-template-columns:1fr 1fr;}
  .compact-hero h1,.reference-hero h1{font-size:clamp(2.65rem,11.5vw,4.15rem)!important;}
}
@media(max-width:560px){
  .tool-card-grid{grid-template-columns:1fr;}
  .home-hero .player-window,.home-hero .hero-player{min-height:230px!important;}
  .compact-hero .hero-actions .btn,.reference-hero .hero-actions .btn{width:100%;}
}

/* V6.2 mobile-first viewport polish
   Scope: fix core mobile density after screenshot audit.
   Goal: the user should see the action area earlier on 390px without losing the desktop theater layout. */
@media(max-width:720px){
  .header-inner{min-height:64px;gap:10px;width:calc(100% - 20px)!important;}
  .brand{font-size:1.05rem;gap:8px;}
  .brand-mark{width:26px;height:26px;border-radius:9px;}
  .mobile-menu-toggle,.lang-pill{padding:9px 13px;}

  .home-hero .hero-inner{padding-top:28px!important;padding-bottom:24px!important;}
  .home-hero .hero-chips{margin-bottom:10px!important;}
  .home-hero .hero-chips .chip:not(:last-child){display:none!important;}
  .home-hero h1{font-size:clamp(2.55rem,10.6vw,3.45rem)!important;line-height:.95!important;letter-spacing:-.058em!important;margin-bottom:10px!important;}
  .home-hero .lead{font-size:.98rem!important;line-height:1.42!important;margin-bottom:14px!important;}
  .home-hero .inputbar,.home-hero .hero-inputbar{display:grid!important;grid-template-columns:1fr 1fr!important;gap:9px!important;margin:14px auto 14px!important;}
  .home-hero .hero-inputbar .field,.home-hero .inputbar .field{grid-column:1/-1!important;min-height:50px!important;border-radius:20px!important;}
  .home-hero .hero-inputbar .btn,.home-hero .inputbar .btn{padding:12px 13px!important;min-height:48px!important;box-shadow:none!important;}
  .home-hero .hero-inputbar .icon-only,.home-hero .inputbar .icon-only{display:none!important;}
  .home-hero .player-window,.home-hero .hero-player{min-height:215px!important;aspect-ratio:16/9.2!important;border-radius:24px!important;margin-top:16px!important;}
  .player-stage-inner{padding:14px!important;}
  .player-stage-main{min-height:130px!important;}
  .player-stage-main .play-triangle{font-size:3rem!important;}
  .player-main-copy{font-size:1rem!important;}
  .player-current-url{font-size:.83rem!important;}
  .playlist-tabs{margin-top:14px!important;padding:11px!important;border-radius:22px!important;}
  .tabs{grid-template-columns:1fr!important;border-radius:18px!important;}
  .tabs button{padding:9px!important;}

  .compact-hero .hero-inner,.reference-hero .hero-inner{padding-top:22px!important;padding-bottom:20px!important;}
  .compact-hero .breadcrumbs,.reference-hero .breadcrumbs{font-size:.9rem;margin-bottom:10px!important;}
  .compact-hero .hero-chips,.reference-hero .hero-chips{display:none!important;}
  .compact-hero h1,.reference-hero h1{font-size:clamp(2.35rem,10vw,3.25rem)!important;line-height:.96!important;letter-spacing:-.055em!important;margin-bottom:10px!important;}
  .compact-hero .lead,.reference-hero .lead{font-size:.96rem!important;line-height:1.4!important;margin-bottom:12px!important;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;}
  .compact-hero .hero-actions,.reference-hero .hero-actions{display:grid!important;grid-template-columns:1fr 1fr!important;gap:9px!important;}
  .compact-hero .hero-actions .btn,.reference-hero .hero-actions .btn{width:auto!important;padding:11px 9px!important;min-height:46px!important;box-shadow:none!important;}
  .compact-hero .notice,.reference-hero .notice{font-size:.86rem!important;line-height:1.34!important;padding:11px 13px!important;margin-top:12px!important;border-radius:18px!important;}
  .tool-stage-section{padding-top:14px!important;padding-bottom:42px!important;}
  .operation-stage{padding:16px!important;border-radius:26px!important;}
  .stage-toolbar{margin-bottom:14px!important;}
  .stage-toolbar .mini-label{margin-bottom:8px!important;}
  .stage-toolbar h2{font-size:clamp(1.85rem,8.2vw,2.65rem)!important;line-height:.98!important;margin-bottom:8px!important;}
  .stage-toolbar p{font-size:.94rem!important;line-height:1.42!important;}
  .stage-actions{display:grid!important;grid-template-columns:1fr 1fr!important;gap:8px!important;}
  .stage-actions .btn{padding:11px 9px!important;box-shadow:none!important;}
  .stage-primary-panel,.stage-result-panel{padding:15px!important;border-radius:22px!important;}
  .large-field{min-height:48px!important;border-radius:18px!important;}
  .stage-settings-grid,.converter-stage .stage-settings-grid{gap:10px!important;}
  .stage-queue{min-height:150px!important;}
  .boundary-grid{gap:10px!important;}
  .boundary-grid div{padding:13px!important;}
  .stage-route-bar{gap:9px!important;}
  .stage-route-bar a{padding:13px!important;}
}

@media(max-width:420px){
  .container,.container-wide,.header-inner,.home-hero .container,.compact-hero .container,.reference-hero .container{width:calc(100% - 20px)!important;}
  .home-hero h1{font-size:clamp(2.38rem,10.3vw,3.12rem)!important;}
  .compact-hero h1,.reference-hero h1{font-size:clamp(2.2rem,9.8vw,2.95rem)!important;}
  .home-hero .lead,.compact-hero .lead,.reference-hero .lead{font-size:.94rem!important;}
  .home-hero .player-window,.home-hero .hero-player{min-height:205px!important;}
  .field{padding:13px 14px!important;}
}

/* V6.2 pass 2: mobile player stage overlap fix from self-audit screenshot. */
@media(max-width:720px){
  .player-topbar{padding:10px 14px!important;min-height:42px!important;}
  .player-topbar .dot{width:8px!important;height:8px!important;}
  .player-center{padding:16px 12px!important;align-content:center!important;}
  .player-center .play-triangle{font-size:3.25rem!important;}
  .player-center p{margin-top:6px!important;}
  .player-main-copy{font-size:.98rem!important;line-height:1.15!important;}
  .player-current-url{display:none!important;}
  .player-controls{padding:8px 14px 10px!important;}
  .player-track{height:6px!important;}
  .player-control-row{display:none!important;}
  .home-hero .player-window,.home-hero .hero-player{min-height:205px!important;}
}
@media(max-width:420px){
  .player-center{padding:14px 10px!important;}
  .player-center .play-triangle{font-size:3rem!important;}
  .player-main-copy{font-size:.94rem!important;}
}


/* V6.3 global typography harmony pass.
   Fullscreen layout must not mean uncontrolled type sizes. */
:root{--type-h1:clamp(2.35rem,4.8vw,5.1rem);--type-h2:clamp(1.7rem,2.85vw,2.85rem);--type-h3:clamp(1.08rem,1.45vw,1.34rem);--type-lead:clamp(1rem,1.18vw,1.18rem);}
h1{font-size:var(--type-h1)!important;line-height:1.01!important;letter-spacing:-.055em!important;}
h2{font-size:var(--type-h2)!important;line-height:1.08!important;letter-spacing:-.038em!important;}
h3{font-size:var(--type-h3)!important;line-height:1.18!important;letter-spacing:-.02em!important;}
.lead{font-size:var(--type-lead)!important;line-height:1.62!important;}
.home-hero h1{font-size:clamp(2.65rem,5.6vw,5.45rem)!important;}
.compact-hero h1,.reference-hero h1{font-size:clamp(2.35rem,4.65vw,4.85rem)!important;}
.tool-card-op strong{font-size:clamp(1.08rem,1.25vw,1.28rem)!important;}
.btn{font-size:clamp(.92rem,1vw,1rem)!important;}
.card,.soft-card,.tool-group,.tool-panel,.operation-stage{font-size:1rem;}
@media(max-width:720px){h1{font-size:clamp(2.1rem,9.2vw,3.05rem)!important;}h2{font-size:clamp(1.48rem,7vw,2.15rem)!important;}.lead{font-size:.96rem!important;line-height:1.45!important;}.home-hero h1{font-size:clamp(2.28rem,10vw,3.15rem)!important;}.compact-hero h1,.reference-hero h1{font-size:clamp(2.05rem,9.2vw,2.85rem)!important;}}