/* === YouTube Video Downloader v1.0 — KTHDIGI === */
@font-face{font-family:'Phudu';src:url('https://kth-electric.com/wp-content/fonts/DT-Phudu/DTPhudu-Bold.woff') format('woff');font-weight:700;font-display:swap}
@font-face{font-family:'Ganh';src:url('https://kth-electric.com/wp-content/fonts/Ganh/Ganh%20Type-Regular.otf') format('opentype');font-weight:400;font-display:swap}

:root{
  --p:#ff0000;--p2:#cc0000;--p3:#ff4444;--bg:#0f0f0f;--surface:#1a1a1a;--surface2:#272727;
  --border:#3a3a3a;--text:#f1f1f1;--muted:#aaa;--success:#2ecc71;--warn:#f39c12;--err:#e74c3c;
  --info:#3498db;--radius:14px;--shadow:0 8px 32px rgba(0,0,0,.45);
  --glow:0 0 20px rgba(255,0,0,.15);--grad:linear-gradient(135deg,var(--p),#ff6b35)
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:'Ganh',sans-serif;background:var(--bg);color:var(--text);line-height:1.7;min-height:100vh}
.brand-font{font-family:'Phudu',sans-serif}
.container{max-width:960px;margin:0 auto;padding:0 20px}
.ic{display:inline-block;width:1em;height:1em;vertical-align:-.125em;fill:currentColor}

/* HEADER */
.kth-header{background:var(--surface);border-bottom:1px solid var(--border);padding:14px 0;position:sticky;top:0;z-index:100;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}
.nav-flex{display:flex;align-items:center;justify-content:space-between}
.logo{color:var(--p);font-family:'Phudu',sans-serif;font-size:1.15rem;text-decoration:none;display:flex;align-items:center;gap:6px}
.logo span{color:var(--text)}
.theme-btn{background:none;border:1px solid var(--border);border-radius:8px;padding:6px 10px;cursor:pointer;font-size:1rem;color:var(--text);transition:.3s}
.theme-btn:hover{border-color:var(--p);background:var(--surface2)}

/* HERO */
.hero{text-align:center;padding:48px 20px 32px;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:-60%;left:-20%;width:140%;height:200%;background:radial-gradient(ellipse at 50% 0%,rgba(255,0,0,.08) 0%,transparent 60%);pointer-events:none}
.hero h1{font-family:'Phudu',sans-serif;font-size:clamp(1.6rem,4vw,2.4rem);background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:8px;position:relative}
.hero p{color:var(--muted);font-size:1rem;max-width:560px;margin:0 auto;position:relative}
.hero-badges{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:16px;position:relative}
.badge{background:var(--surface2);border:1px solid var(--border);border-radius:20px;padding:5px 14px;font-size:.8rem;color:var(--muted);display:flex;align-items:center;gap:5px}
.badge .ic{width:.85em;height:.85em}

/* SHIMMER */
@keyframes shimmer{0%{background-position:-200% 0}100%{background-position:200% 0}}
.hero h1::after{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(90deg,transparent 30%,rgba(255,255,255,.08) 50%,transparent 70%);background-size:200% 100%;animation:shimmer 3s infinite;pointer-events:none}

/* INPUT CARD */
.input-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:28px;margin:-10px auto 24px;max-width:700px;box-shadow:var(--shadow);position:relative}
.input-wrap{display:flex;gap:10px;margin-bottom:12px}
.input-wrap input{flex:1;background:var(--surface2);border:1px solid var(--border);border-radius:10px;padding:14px 16px;color:var(--text);font-size:1rem;font-family:'Ganh',sans-serif;outline:none;transition:border .3s}
.input-wrap input:focus{border-color:var(--p);box-shadow:0 0 0 3px rgba(255,0,0,.12)}
.input-wrap input::placeholder{color:#666}
.input-actions{display:flex;gap:8px}
.btn-paste,.btn-clear{background:var(--surface2);border:1px solid var(--border);border-radius:10px;padding:10px 14px;cursor:pointer;color:var(--muted);font-size:.85rem;transition:.3s;display:flex;align-items:center;gap:5px;font-family:'Ganh',sans-serif}
.btn-paste:hover,.btn-clear:hover{border-color:var(--p);color:var(--p)}
.btn-dl{background:var(--grad);border:none;border-radius:10px;padding:14px 28px;color:#fff;font-size:1rem;font-weight:700;font-family:'Phudu',sans-serif;cursor:pointer;transition:.3s;display:flex;align-items:center;gap:8px;justify-content:center;width:100%;letter-spacing:.5px}
.btn-dl:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(255,0,0,.35)}
.btn-dl:active{transform:translateY(0)}
.btn-dl:disabled{opacity:.5;cursor:not-allowed;transform:none}
.btn-dl .spinner{display:none;width:18px;height:18px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .6s linear infinite}
.btn-dl.loading .spinner{display:inline-block}
.btn-dl.loading .btn-text{display:none}
@keyframes spin{to{transform:rotate(360deg)}}

/* FORMAT SELECTOR */
.format-row{display:flex;gap:8px;margin-bottom:14px;flex-wrap:wrap}
.fmt-btn{background:var(--surface2);border:1px solid var(--border);border-radius:8px;padding:8px 16px;cursor:pointer;color:var(--muted);font-size:.85rem;font-family:'Ganh',sans-serif;transition:.3s;flex:1;text-align:center;min-width:80px}
.fmt-btn:hover{border-color:var(--p);color:var(--text)}
.fmt-btn.active{background:var(--p);border-color:var(--p);color:#fff;font-weight:600}

/* QUALITY SELECTOR */
.quality-row{display:flex;gap:8px;margin-bottom:14px;flex-wrap:wrap}
.q-btn{background:var(--surface2);border:1px solid var(--border);border-radius:8px;padding:6px 14px;cursor:pointer;color:var(--muted);font-size:.82rem;font-family:'Ganh',sans-serif;transition:.3s}
.q-btn:hover{border-color:var(--p3);color:var(--text)}
.q-btn.active{background:var(--p2);border-color:var(--p);color:#fff}

/* PREVIEW */
.preview{display:none;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;margin:0 auto 24px;max-width:700px;box-shadow:var(--shadow)}
.preview.show{display:block;animation:fadeUp .4s ease}
@keyframes fadeUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}
.preview-thumb{position:relative;width:100%;aspect-ratio:16/9;overflow:hidden;background:#000}
.preview-thumb img{width:100%;height:100%;object-fit:cover}
.preview-duration{position:absolute;bottom:10px;right:10px;background:rgba(0,0,0,.85);color:#fff;padding:3px 8px;border-radius:4px;font-size:.8rem;font-weight:600}
.preview-body{padding:18px}
.preview-title{font-size:1rem;font-weight:600;line-height:1.4;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.preview-meta{display:flex;gap:14px;flex-wrap:wrap;color:var(--muted);font-size:.85rem;margin-bottom:14px}
.preview-meta span{display:flex;align-items:center;gap:4px}
.dl-buttons{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px}
.dl-btn{display:flex;align-items:center;justify-content:center;gap:8px;padding:12px 16px;border-radius:10px;border:none;cursor:pointer;font-size:.9rem;font-weight:600;font-family:'Ganh',sans-serif;transition:.3s;text-decoration:none;color:#fff}
.dl-btn:hover{transform:translateY(-2px);filter:brightness(1.1)}
.dl-btn.video-hd{background:linear-gradient(135deg,#ff0000,#cc0000)}
.dl-btn.video-sd{background:linear-gradient(135deg,#ff6b35,#e55d30)}
.dl-btn.audio-mp3{background:linear-gradient(135deg,#1db954,#1aa34a)}
.dl-btn.audio-mp4{background:linear-gradient(135deg,#9b59b6,#8e44ad)}
.dl-btn .ic{width:1.1em;height:1.1em}

/* HISTORY */
.history-section{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin:0 auto 24px;max-width:700px;box-shadow:var(--shadow)}
.history-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.history-header h3{font-family:'Phudu',sans-serif;font-size:1rem;color:var(--p)}
.history-clear{background:none;border:1px solid var(--border);border-radius:8px;padding:5px 12px;color:var(--muted);cursor:pointer;font-size:.8rem;font-family:'Ganh',sans-serif;transition:.3s}
.history-clear:hover{border-color:var(--err);color:var(--err)}
.history-list{list-style:none;display:flex;flex-direction:column;gap:8px}
.history-item{display:flex;align-items:center;gap:10px;padding:8px;background:var(--surface2);border-radius:8px;cursor:pointer;transition:.3s;overflow:hidden}
.history-item:hover{background:var(--border)}
.history-thumb{width:64px;height:36px;border-radius:4px;object-fit:cover;flex-shrink:0;background:#000}
.history-info{flex:1;min-width:0}
.history-title{font-size:.82rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.history-date{font-size:.72rem;color:var(--muted)}
.history-empty{text-align:center;color:var(--muted);font-size:.88rem;padding:16px}

/* STEPS */
.steps-section{margin:32px auto;max-width:700px}
.steps-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:20px}
.step{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px 14px;text-align:center;position:relative;transition:.3s}
.step:hover{border-color:var(--p);transform:translateY(-3px);box-shadow:var(--glow)}
.step-num{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--grad);color:#fff;width:26px;height:26px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:700;font-family:'Phudu',sans-serif}
.step-icon{font-size:1.8rem;margin:10px 0 8px}
.step h4{font-size:.85rem;margin-bottom:4px;font-family:'Phudu',sans-serif}
.step p{font-size:.78rem;color:var(--muted);line-height:1.4}

/* FEATURES */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:32px auto;max-width:700px}
.feat{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;text-align:center;transition:.3s}
.feat:hover{border-color:var(--p3);transform:translateY(-2px)}
.feat-icon{font-size:2rem;margin-bottom:8px;display:block}
.feat h4{font-size:.85rem;margin-bottom:4px;font-family:'Phudu',sans-serif}
.feat p{font-size:.78rem;color:var(--muted);line-height:1.4}

/* SEO CONTENT */
.seo-content{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:28px;margin:24px auto;max-width:700px;box-shadow:var(--shadow)}
.seo-content h2{font-family:'Phudu',sans-serif;font-size:1.3rem;color:var(--p);margin-bottom:12px}
.seo-content h3{font-family:'Phudu',sans-serif;font-size:1.05rem;color:var(--text);margin:20px 0 8px}
.seo-content p{color:var(--muted);margin-bottom:12px;line-height:1.8}
.seo-content ul,.seo-content ol{color:var(--muted);padding-left:20px;margin-bottom:14px}
.seo-content li{margin-bottom:6px;line-height:1.6}
.seo-content strong{color:var(--text)}
.seo-content a{color:var(--p3);text-decoration:none;border-bottom:1px dotted var(--p3)}
.seo-content a:hover{color:var(--p)}

/* COMPARISON TABLE */
.cmp-table{width:100%;border-collapse:collapse;margin:16px 0;font-size:.85rem}
.cmp-table th{background:var(--p);color:#fff;padding:10px 12px;text-align:left;font-family:'Phudu',sans-serif;font-weight:600}
.cmp-table td{padding:9px 12px;border-bottom:1px solid var(--border)}
.cmp-table tr:nth-child(even) td{background:var(--surface2)}
.cmp-table tr:hover td{background:rgba(255,0,0,.05)}

/* LEGAL CALLOUT */
.legal-callout{background:linear-gradient(135deg,rgba(255,0,0,.08),rgba(255,107,53,.06));border:1px solid rgba(255,0,0,.2);border-radius:var(--radius);padding:18px;margin:20px 0}
.legal-callout h4{color:var(--p);font-family:'Phudu',sans-serif;margin-bottom:6px;display:flex;align-items:center;gap:6px}
.legal-callout p{color:var(--muted);font-size:.88rem;line-height:1.6}

/* FAQ */
.faq-section{margin:24px auto;max-width:700px}
.faq-section h2{font-family:'Phudu',sans-serif;color:var(--p);text-align:center;margin-bottom:16px;font-size:1.2rem}
.faq-item{background:var(--surface);border:1px solid var(--border);border-radius:10px;margin-bottom:8px;overflow:hidden}
.faq-q{padding:14px 18px;cursor:pointer;font-weight:600;font-size:.92rem;display:flex;justify-content:space-between;align-items:center;transition:.3s;user-select:none}
.faq-q:hover{color:var(--p)}
.faq-q::after{content:'▼';font-size:.7rem;color:var(--muted);transition:transform .3s}
.faq-item.open .faq-q::after{transform:rotate(180deg);color:var(--p)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease,padding .35s;padding:0 18px}
.faq-item.open .faq-a{max-height:300px;padding:0 18px 16px}
.faq-a p{color:var(--muted);font-size:.88rem;line-height:1.7}

/* RELATED TOOLS */
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;margin:24px auto;max-width:700px}
.rel-card{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:16px;text-align:center;text-decoration:none;color:var(--text);transition:.3s}
.rel-card:hover{border-color:var(--p);transform:translateY(-3px);box-shadow:var(--glow)}
.rel-icon{font-size:1.6rem;margin-bottom:6px;display:block}
.rel-card h4{font-size:.85rem;margin-bottom:3px}
.rel-card p{font-size:.75rem;color:var(--muted)}

/* TOAST */
.toast-container{position:fixed;top:20px;right:20px;z-index:9999;display:flex;flex-direction:column;gap:8px}
.toast{padding:12px 18px;border-radius:10px;color:#fff;font-size:.88rem;box-shadow:0 4px 12px rgba(0,0,0,.3);animation:toastIn .3s ease;max-width:340px;display:flex;align-items:center;gap:8px;font-family:'Ganh',sans-serif}
@keyframes toastIn{from{opacity:0;transform:translateX(40px)}to{opacity:1;transform:translateX(0)}}
.toast.info{background:var(--info)}.toast.success{background:var(--success)}.toast.warn{background:var(--warn)}.toast.error{background:var(--err)}

/* FOOTER */
.kth-footer{background:var(--surface);border-top:1px solid var(--border);padding:28px 0;margin-top:40px}
.footer-inner{text-align:center}
.footer-brand{font-family:'Phudu',sans-serif;font-size:1rem;color:var(--p);margin-bottom:4px}
.footer-author{font-size:.85rem;color:var(--muted);margin-bottom:12px}
.footer-author a{color:var(--p3);text-decoration:none}
.footer-links{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:14px}
.footer-links a{color:var(--muted);text-decoration:none;font-size:.82rem;transition:color .3s}
.footer-links a:hover{color:var(--p)}
.footer-social{display:flex;gap:12px;justify-content:center;margin-bottom:10px}
.footer-social a{color:var(--muted);transition:color .3s}
.footer-social a:hover{color:var(--p)}
.footer-social .ic{width:20px;height:20px}
.footer-copy{font-size:.78rem;color:#555}
.footer-disclaimer{max-width:560px;margin:10px auto 0;font-size:.75rem;color:#555;line-height:1.5;border-top:1px solid var(--border);padding-top:10px}

/* RESPONSIVE */
@media(max-width:768px){
  .steps-grid,.features{grid-template-columns:repeat(2,1fr)}
  .input-wrap{flex-direction:column}
  .input-actions{justify-content:stretch}
  .btn-paste,.btn-clear{flex:1;justify-content:center}
  .dl-buttons{grid-template-columns:1fr 1fr}
  .preview-meta{gap:8px}
  .related-grid{grid-template-columns:repeat(2,1fr)}
  .format-row{flex-wrap:wrap}
  .fmt-btn{flex:1 1 45%}
}
@media(max-width:480px){
  .steps-grid,.features{grid-template-columns:1fr}
  .dl-buttons{grid-template-columns:1fr}
  .hero{padding:32px 16px 24px}
  .input-card{padding:18px}
  .quality-row{flex-wrap:wrap}
  .q-btn{flex:1 1 28%}
}