/* ── YouTube Thumbnail Safe Zone Checker — CSS ── */
:root{
  --bg:#0f0f14;--bg-card:#1e1e28;--bg-surface:#18181f;
  --primary:#ff0000;--secondary:#cc0000;--accent:#ff4444;
  --text:#e8e8f0;--text-muted:#9999b8;--text-faint:#555570;
  --border:rgba(255,255,255,.08);--border-strong:rgba(255,255,255,.14);
  --radius:14px;--radius-sm:8px;
  --font:'Inter',system-ui,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--bg);color:var(--text);font-family:var(--font);font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
code{font-family:monospace;font-size:.85em;background:rgba(255,0,0,.1);color:#ff6666;padding:2px 6px;border-radius:4px}

/* ── Header ── */
.site-header{background:rgba(15,15,20,.9);backdrop-filter:blur(14px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;padding:0 24px;height:58px;display:flex;align-items:center}
.header-inner{width:100%;max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:9px;text-decoration:none}
.logo-icon{width:32px;height:32px;flex-shrink:0}
.logo-text{font-size:.97rem;font-weight:700;color:var(--text);letter-spacing:-.01em}
.main-nav{display:flex;gap:6px}
.nav-link{padding:5px 12px;border-radius:var(--radius-sm);font-size:.84rem;font-weight:500;color:var(--text-muted);text-decoration:none;transition:color .15s,background .15s}
.nav-link:hover,.nav-link.active{color:var(--text);background:rgba(255,255,255,.06)}

/* ── Wrap ── */
.main-wrap{max-width:1040px;margin:0 auto;padding:28px 24px 80px}
@media(max-width:640px){.main-wrap{padding:18px 14px 60px}}

/* ── Hero ── */
.tool-hero{text-align:center;padding:28px 0 22px}
.tool-badge{display:inline-flex;align-items:center;gap:5px;padding:4px 12px;background:rgba(255,0,0,.1);color:var(--primary);border-radius:20px;font-size:.73rem;font-weight:600;margin-bottom:12px}
.tool-title{font-size:clamp(1.6rem,4vw,2.2rem);font-weight:800;letter-spacing:-.02em;margin-bottom:8px}
.gradient-title{background:linear-gradient(135deg,var(--primary),#ff8800);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.tool-subtitle{font-size:.97rem;color:var(--text-muted);max-width:600px;margin:0 auto}

/* ── Ad slot ── */
.ad-slot{background:rgba(255,255,255,.02);border:1px dashed rgba(255,255,255,.07);border-radius:var(--radius);display:flex;align-items:center;justify-content:center;min-height:90px;font-size:.75rem;color:var(--text-faint);text-align:center;padding:12px;margin-bottom:20px}

/* ── Card base ── */
.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;margin-bottom:20px}
.card-header{padding:13px 18px;border-bottom:1px solid var(--border);background:rgba(255,255,255,.02);display:flex;align-items:center;gap:8px}
.card-icon{width:28px;height:28px;border-radius:7px;background:rgba(255,0,0,.1);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.card-icon svg{width:13px;height:13px;color:var(--primary)}
.card-title{font-size:.82rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--text-faint)}
.card-body{padding:20px}

/* ── Buttons ── */
.btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:10px 20px;border-radius:var(--radius-sm);background:var(--primary);color:#fff;font-weight:700;font-size:.88rem;border:none;cursor:pointer;transition:background .15s;width:auto}
.btn-primary:hover{background:var(--secondary)}
.btn-primary.full{width:100%}
.btn-outline{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 14px;border-radius:var(--radius-sm);background:transparent;color:var(--text-muted);font-size:.82rem;font-weight:600;border:1px solid var(--border);cursor:pointer;transition:border-color .15s,color .15s}
.btn-outline:hover{border-color:var(--primary);color:var(--text)}

/* ── Upload zone ── */
.upload-zone{border:2px dashed var(--border);border-radius:var(--radius);padding:36px 20px;text-align:center;cursor:pointer;transition:border-color .2s,background .2s;position:relative}
.upload-zone:hover,.upload-zone.drag-over{border-color:var(--primary);background:rgba(255,0,0,.04)}
.upload-icon{font-size:2.4rem;margin-bottom:10px}
.upload-title{font-size:1rem;font-weight:700;color:var(--text);margin-bottom:4px}
.upload-sub{font-size:.8rem;color:var(--text-faint)}
.upload-zone input[type=file]{position:absolute;inset:0;opacity:0;cursor:pointer;width:100%;height:100%}

/* ── Main preview layout ── */
.preview-wrap{display:grid;grid-template-columns:1fr 320px;gap:20px;align-items:start}
@media(max-width:900px){.preview-wrap{grid-template-columns:1fr}}

/* ── Canvas container ── */
.canvas-container{position:relative;width:100%;background:var(--bg-surface);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border)}
.canvas-container canvas{display:block;width:100%;height:auto;cursor:crosshair}
.canvas-placeholder{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:320px;color:var(--text-faint);gap:8px;font-size:.88rem}
.canvas-placeholder svg{width:48px;height:48px;opacity:.3}

/* ── Preview modes nav ── */
.preview-tabs{display:flex;gap:0;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden;margin-bottom:14px}
.preview-tab{flex:1;padding:9px 6px;font-size:.73rem;font-weight:600;border:none;background:transparent;color:var(--text-faint);cursor:pointer;border-right:1px solid var(--border);transition:background .15s,color .15s;text-align:center;letter-spacing:.01em}
.preview-tab:last-child{border-right:none}
.preview-tab.active{background:rgba(255,0,0,.12);color:var(--primary)}
.preview-tab:hover:not(.active){background:rgba(255,255,255,.03);color:var(--text-muted)}

/* ── Overlay toggle chips ── */
.overlay-chips{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px}
.ov-chip{display:inline-flex;align-items:center;gap:5px;padding:5px 10px;border-radius:20px;font-size:.72rem;font-weight:600;border:1px solid var(--border);cursor:pointer;transition:background .15s,border-color .15s;color:var(--text-muted)}
.ov-chip .ov-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}
.ov-chip.active{border-color:transparent;color:#fff}
.ov-chip.ov-safezone.active{background:rgba(34,197,94,.2);border-color:rgba(34,197,94,.4);color:#4ade80}
.ov-chip.ov-safezone .ov-dot{background:#22c55e}
.ov-chip.ov-ui.active{background:rgba(250,204,21,.15);border-color:rgba(250,204,21,.35);color:#facc15}
.ov-chip.ov-ui .ov-dot{background:#facc15}
.ov-chip.ov-grid.active{background:rgba(148,163,184,.12);border-color:rgba(148,163,184,.25);color:#94a3b8}
.ov-chip.ov-grid .ov-dot{background:#94a3b8}
.ov-chip.ov-title.active{background:rgba(167,139,250,.15);border-color:rgba(167,139,250,.35);color:#a78bfa}
.ov-chip.ov-title .ov-dot{background:#a78bfa}

/* ── Safe zone legend ── */
.legend-list{list-style:none;display:flex;flex-direction:column;gap:8px}
.legend-item{display:flex;align-items:flex-start;gap:9px;font-size:.8rem;color:var(--text-muted)}
.legend-swatch{width:12px;height:12px;border-radius:3px;flex-shrink:0;margin-top:2px}

/* ── Info rows ── */
.info-row{display:flex;justify-content:space-between;align-items:center;padding:7px 0;border-bottom:1px solid rgba(255,255,255,.04);font-size:.82rem}
.info-row:last-child{border-bottom:none}
.info-label{color:var(--text-faint)}
.info-val{color:var(--text);font-weight:600}
.info-val.ok{color:#4ade80}
.info-val.warn{color:#facc15}
.info-val.bad{color:#f87171}

/* ── Mockup preview frames ── */
.mockup-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:14px}
@media(max-width:540px){.mockup-grid{grid-template-columns:1fr}}
.mockup-card{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden}
.mockup-label{font-size:.68rem;font-weight:700;color:var(--text-faint);text-transform:uppercase;letter-spacing:.07em;padding:7px 10px;border-bottom:1px solid var(--border)}
.mockup-frame{padding:10px;background:#f1f1f1;display:flex;flex-direction:column;gap:6px}
.mockup-frame.dark-frame{background:#0d0d0d}
.mockup-frame.mobile-frame{background:#fff;padding:8px}
.thumb-wrap{position:relative;overflow:hidden;border-radius:4px}
.thumb-wrap img{display:block;width:100%;height:auto}
.thumb-overlay-duration{position:absolute;bottom:3px;right:4px;background:rgba(0,0,0,.85);color:#fff;font-size:.62rem;font-weight:700;padding:1px 5px;border-radius:3px;font-family:monospace}

/* YouTube search result mockup */
.yt-result{display:flex;gap:8px;align-items:flex-start}
.yt-result-thumb{position:relative;flex-shrink:0;width:120px;border-radius:4px;overflow:hidden}
.yt-result-thumb img{display:block;width:100%;height:auto}
.yt-result-info{flex:1;min-width:0}
.yt-result-title{font-size:.72rem;font-weight:600;color:#f0f0f0;line-height:1.3;margin-bottom:3px;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.yt-result-meta{font-size:.62rem;color:#9999aa}

/* YouTube mobile mockup */
.yt-mobile-feed{display:flex;flex-direction:column;gap:8px}
.yt-mobile-card{background:#1a1a2a;border-radius:6px;overflow:hidden}
.yt-mobile-thumb{position:relative;width:100%}
.yt-mobile-thumb img{display:block;width:100%;height:auto}
.yt-mobile-info{padding:6px 8px 8px}
.yt-mobile-title{font-size:.68rem;font-weight:600;color:#eee;line-height:1.3;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.yt-mobile-meta{font-size:.6rem;color:#777;margin-top:2px}

/* ── Pixel info bar ── */
.px-bar{display:flex;gap:6px;flex-wrap:wrap;padding:10px 14px;background:rgba(255,255,255,.025);border-top:1px solid var(--border);font-size:.74rem;color:var(--text-faint)}
.px-item{display:flex;align-items:center;gap:4px}
.px-val{color:var(--text-muted);font-weight:600}

/* ── Download bar ── */
.dl-bar{display:flex;gap:8px;flex-wrap:wrap;padding:14px;border-top:1px solid var(--border)}

/* ── Page sections ── */
.page-section{padding:40px 0 0}
.section-head{text-align:center;margin-bottom:28px}
.section-title{font-size:clamp(1.3rem,3vw,1.7rem);font-weight:800;letter-spacing:-.02em}
.section-desc{font-size:.93rem;color:var(--text-muted);margin-top:6px}
.section-divider{height:1px;background:var(--border);margin:40px 0 0}

/* ── Features grid ── */
.features-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}
.feature-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:18px}
.feature-icon{font-size:1.5rem;margin-bottom:8px}
.feature-title{font-size:.9rem;font-weight:700;margin-bottom:4px}
.feature-desc{font-size:.8rem;color:var(--text-muted);line-height:1.5}

/* ── Steps grid ── */
.steps-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:14px}
.step-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;display:flex;gap:14px;align-items:flex-start}
.step-number{width:32px;height:32px;border-radius:50%;background:rgba(255,0,0,.15);color:var(--primary);font-weight:800;font-size:.9rem;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.step-body{}
.step-title{font-size:.9rem;font-weight:700;margin-bottom:4px}
.step-desc{font-size:.8rem;color:var(--text-muted);line-height:1.5}

/* ── Logic grid ── */
.logic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}
.logic-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:18px}
.logic-title{font-size:.88rem;font-weight:700;margin-bottom:6px;color:var(--text)}
.logic-desc{font-size:.8rem;color:var(--text-muted);line-height:1.55}

/* ── FAQ ── */
.faq-list{display:flex;flex-direction:column;gap:10px}
.faq-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;padding:14px 18px;font-size:.9rem;font-weight:600;background:none;border:none;color:var(--text);cursor:pointer;text-align:left;gap:10px}
.faq-icon{font-size:1.2rem;color:var(--text-faint);flex-shrink:0;transition:transform .2s}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-item.open .faq-a{max-height:400px}
.faq-item.open .faq-icon{transform:rotate(45deg)}
.faq-a p{padding:0 18px 16px;font-size:.85rem;color:var(--text-muted);line-height:1.65}

/* ── Related tools ── */
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px}
.related-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:16px;display:flex;flex-direction:column;gap:6px;text-decoration:none;transition:border-color .15s}
.related-card:hover{border-color:var(--primary);text-decoration:none}
.related-icon{width:36px;height:36px;border-radius:9px;display:flex;align-items:center;justify-content:center;margin-bottom:4px}
.related-icon svg{width:17px;height:17px;color:#fff}
.related-name{font-size:.88rem;font-weight:700;color:var(--text)}
.related-desc{font-size:.77rem;color:var(--text-muted);line-height:1.4}
.related-link{font-size:.75rem;color:var(--primary);font-weight:600;margin-top:auto}

/* ── Blog related ── */
.blog-related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px}
.blog-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:16px;display:flex;flex-direction:column;gap:6px;text-decoration:none;transition:border-color .15s}
.blog-card:hover{border-color:var(--primary);text-decoration:none}
.blog-tag-sm{font-size:.7rem;font-weight:700;color:var(--primary)}
.blog-title-sm{font-size:.85rem;font-weight:600;color:var(--text);line-height:1.4}
.blog-link{font-size:.75rem;color:var(--primary);font-weight:600;margin-top:auto}

/* ── Footer ── */
.site-footer{border-top:1px solid var(--border);padding:40px 24px 28px;margin-top:60px}
.footer-grid{max-width:1040px;margin:0 auto;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:28px}
@media(max-width:768px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:480px){.footer-grid{grid-template-columns:1fr}}
.footer-brand-text{font-size:.82rem;color:var(--text-faint);margin-top:8px;line-height:1.5}
.footer-heading{font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--text-faint);margin-bottom:10px}
.footer-links{display:flex;flex-direction:column;gap:7px}
.footer-links a{font-size:.83rem;color:var(--text-muted)}
.footer-links a:hover{color:var(--text)}
.footer-bottom{max-width:1040px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;font-size:.75rem;color:var(--text-faint);flex-wrap:wrap;gap:8px;padding-top:16px;border-top:1px solid var(--border)}

/* ── Toast ── */
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(12px);background:#22c55e;color:#fff;padding:8px 18px;border-radius:20px;font-size:.82rem;font-weight:600;opacity:0;transition:opacity .2s,transform .2s;pointer-events:none;z-index:999;white-space:nowrap}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}