/* === Facebook 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{--bg:#f0f2f5;--card:#fff;--card2:#f8f9fa;--border:#dddfe2;--text:#1c1e21;--muted:#65676b;--p:#1877f2;--accent:#42b72a;--danger:#fa3e3e;--warn:#f7b928;--radius:16px;--shadow:0 2px 12px rgba(0,0,0,.08)}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Ganh',sans-serif;background:var(--bg);color:var(--text);line-height:1.7;min-height:100vh;display:flex;flex-direction:column}
h1,h2,h3,h4,.logo,.brand-font{font-family:'Phudu',sans-serif}
a{text-decoration:none;color:inherit}
.ic{display:inline-block;width:1em;height:1em;vertical-align:-.125em;fill:currentColor}
.container{max-width:1100px;margin:0 auto;padding:0 20px}

/* HEADER */
.kth-header{background:#fff;border-bottom:1px solid var(--border);padding:14px 0;position:sticky;top:0;z-index:100;box-shadow:0 2px 4px rgba(0,0,0,.04)}
.nav-flex{display:flex;justify-content:space-between;align-items:center}
.logo{font-size:1.5rem;color:var(--p);display:flex;align-items:center;gap:8px;font-weight:700}
.logo span{color:#333}
.header-links{display:flex;gap:4px}
.header-links a{padding:6px 14px;border-radius:8px;font-weight:600;color:var(--muted);font-size:.88rem;transition:.2s;display:flex;align-items:center;gap:5px}
.header-links a:hover{color:var(--p);background:rgba(24,119,242,.06)}

/* HERO */
.hero{background:linear-gradient(135deg,#1877f2 0%,#42b72a 100%);padding:50px 0 80px;text-align:center;color:#fff;position:relative;clip-path:polygon(0 0,100% 0,100% 85%,0 100%);margin-bottom:-30px}
.hero h1{font-size:clamp(1.6rem,4.5vw,2.6rem);margin-bottom:10px;text-shadow:0 2px 8px rgba(0,0,0,.15)}
.hero p{opacity:.95;font-size:1rem;max-width:520px;margin:0 auto}
.hero-badges{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:16px}
.h-badge{background:rgba(255,255,255,.18);backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,.25);border-radius:20px;padding:5px 14px;font-size:.78rem;color:#fff;display:flex;align-items:center;gap:5px}

/* INPUT CARD */
.input-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:28px;max-width:700px;margin:0 auto;position:relative;z-index:10;box-shadow:var(--shadow)}
.input-row{display:flex;gap:8px;margin-bottom:14px;position:relative}
.url-input{flex:1;padding:14px 90px 14px 18px;background:var(--card2);border:2px solid var(--border);border-radius:12px;color:var(--text);font-size:1rem;font-family:inherit;outline:none;transition:.3s}
.url-input::placeholder{color:#b0b3b8}
.url-input:focus{border-color:var(--p);box-shadow:0 0 0 3px rgba(24,119,242,.12)}
.input-actions{position:absolute;right:10px;top:50%;transform:translateY(-50%);display:flex;gap:4px}
.act-btn{background:var(--card2);border:1px solid var(--border);color:var(--muted);width:34px;height:34px;border-radius:8px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:.2s;padding:0}
.act-btn:hover{border-color:var(--p);color:var(--p)}
#clearBtn{display:none}
.btn-download{width:100%;padding:15px;background:var(--p);color:#fff;border:none;border-radius:12px;font-size:1.1rem;font-weight:700;font-family:'Phudu',sans-serif;cursor:pointer;transition:.3s;display:flex;align-items:center;justify-content:center;gap:10px}
.btn-download:hover{background:#166fe5;transform:translateY(-2px);box-shadow:0 6px 20px rgba(24,119,242,.3)}
.btn-download:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}
.spinner-sm{width:18px;height:18px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .6s linear infinite;display:inline-block}

/* LOADER */
.loader{display:none;text-align:center;padding:30px 0}
.loader.active{display:block}
.spinner{width:36px;height:36px;border:3px solid var(--border);border-top-color:var(--p);border-radius:50%;animation:spin .7s linear infinite;margin:0 auto 10px}
@keyframes spin{to{transform:rotate(360deg)}}
.loader p{color:var(--muted);font-size:.88rem}

/* RESULT */
.result{display:none;margin-top:20px;animation:fadeUp .4s ease}
.result.active{display:block}
@keyframes fadeUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
.preview-card{background:var(--card2);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;display:grid;grid-template-columns:200px 1fr}
.preview-thumb{width:200px;height:200px;object-fit:cover;background:#e4e6eb}
.preview-info{padding:18px;display:flex;flex-direction:column;justify-content:space-between;gap:8px}
.preview-info .title{font-size:.95rem;font-weight:600;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;line-height:1.5}
.preview-info .author{color:var(--p);font-size:.85rem;font-weight:600}
.preview-info .stats{color:var(--muted);font-size:.78rem}
.dl-buttons{display:flex;flex-wrap:wrap;gap:6px;margin-top:auto}
.dl-btn{padding:9px 16px;border-radius:10px;font-weight:600;font-size:.84rem;display:inline-flex;align-items:center;gap:5px;cursor:pointer;transition:.2s;border:none;font-family:inherit;text-decoration:none;white-space:nowrap}
.dl-btn.hd{background:var(--p);color:#fff}
.dl-btn.hd:hover{background:#166fe5;transform:translateY(-1px)}
.dl-btn.sd{background:var(--accent);color:#fff}
.dl-btn.sd:hover{background:#36a420}
.dl-btn.audio{background:#9333ea;color:#fff}
.dl-btn.audio:hover{background:#7e22ce}
.dl-btn.copy{background:transparent;border:1px solid var(--border);color:var(--muted);font-size:.8rem}
.dl-btn.copy:hover{border-color:var(--p);color:var(--p)}

/* HISTORY */
.history{margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}
.history h3{font-size:.88rem;color:var(--muted);margin-bottom:10px;display:flex;align-items:center;gap:6px}
.history-list{display:flex;flex-direction:column;gap:6px;max-height:260px;overflow-y:auto}
.history-item{background:var(--card2);border:1px solid var(--border);border-radius:10px;padding:10px 14px;display:flex;align-items:center;gap:10px;cursor:pointer;transition:.2s}
.history-item:hover{border-color:var(--p);background:rgba(24,119,242,.03)}
.h-thumb{width:40px;height:40px;border-radius:6px;object-fit:cover;flex-shrink:0}
.h-body{flex:1;min-width:0}
.h-title{font-size:.82rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:block}
.h-time{color:var(--muted);font-size:.72rem}
.btn-clear-history{background:none;border:none;color:var(--danger);cursor:pointer;font-size:.78rem;font-family:inherit;margin-left:auto;padding:2px 8px}

/* FEATURES */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:50px auto;max-width:700px}
.feat{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px 16px;text-align:center;transition:.25s;box-shadow:var(--shadow)}
.feat:hover{border-color:var(--p);transform:translateY(-3px)}
.feat .feat-icon{width:44px;height:44px;background:rgba(24,119,242,.08);border-radius:12px;display:flex;align-items:center;justify-content:center;margin:0 auto 10px;color:var(--p)}
.feat h4{font-size:.88rem;margin-bottom:4px}
.feat p{font-size:.76rem;color:var(--muted);line-height:1.4}

/* STEPS */
.steps-section{max-width:700px;margin:0 auto 50px}
.steps-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:16px}
.step{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px 14px;text-align:center;box-shadow:var(--shadow)}
.step-num{width:28px;height:28px;background:var(--p);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.82rem;margin:0 auto 10px;font-family:'Phudu'}
.step h4{font-size:.85rem;margin-bottom:4px}
.step p{font-size:.76rem;color:var(--muted);line-height:1.4}

/* SEO */
.seo-content{max-width:700px;margin:0 auto 50px;padding:0 20px}
.seo-content h2{color:var(--p);font-size:1.4rem;margin:30px 0 12px;border-left:3px solid var(--accent);padding-left:12px}
.seo-content h3{color:var(--text);font-size:1.05rem;margin:20px 0 8px}
.seo-content p{color:var(--muted);margin-bottom:12px;line-height:1.8}
.seo-content ul,.seo-content ol{padding-left:20px;color:var(--muted);margin-bottom:16px;line-height:1.8}
.seo-content li{margin-bottom:6px}
.seo-content strong{color:var(--text)}
.seo-content a{color:var(--p);text-decoration:underline}
.seo-table{width:100%;border-collapse:collapse;margin:16px 0;font-size:.86rem}
.seo-table th,.seo-table td{padding:10px 12px;border-bottom:1px solid var(--border);text-align:left}
.seo-table th{color:#fff;background:var(--p);font-weight:700}
.seo-table tr:nth-child(even){background:var(--card2)}
.seo-table tr:hover{background:#e7f3ff}
.callout-legal{background:var(--card);border:1px solid var(--border);border-left:4px solid var(--warn);border-radius:10px;padding:18px 20px;margin:20px 0;font-size:.88rem;color:var(--muted);line-height:1.7}
.callout-legal strong{color:#b45309}

/* FAQ */
.faq-section{max-width:700px;margin:0 auto 50px}
.faq-section h2{color:var(--p);font-size:1.4rem;margin-bottom:16px;border-left:3px solid var(--accent);padding-left:12px}
.faq-item{border:1px solid var(--border);border-radius:10px;margin-bottom:8px;overflow:hidden}
.faq-q{width:100%;padding:14px 18px;background:var(--card);border:none;color:var(--text);font-size:.9rem;font-weight:600;font-family:inherit;text-align:left;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:.2s;gap:10px}
.faq-q:hover{color:var(--p)}
.faq-q::after{content:'+';font-size:1.1rem;color:var(--p);flex-shrink:0}
.faq-item.open .faq-q{background:var(--card2)}
.faq-item.open .faq-q::after{content:'\2212'}
.faq-a{display:none;padding:14px 18px;color:var(--muted);font-size:.88rem;line-height:1.7}
.faq-item.open .faq-a{display:block}

/* RELATED */
.related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin-top:16px}
.tool-link{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:18px;display:flex;align-items:center;gap:12px;transition:.25s;box-shadow:var(--shadow)}
.tool-link:hover{border-color:var(--p);transform:translateY(-2px)}
.tool-icon{width:40px;height:40px;background:rgba(24,119,242,.08);border-radius:10px;display:flex;align-items:center;justify-content:center;color:var(--p);flex-shrink:0}

/* FOOTER */
.kth-footer{background:#fff;border-top:1px solid var(--border);padding:40px 0 20px;text-align:center;margin-top:auto;color:var(--muted);font-size:.85rem}
.footer-links{display:flex;justify-content:center;gap:18px;flex-wrap:wrap;margin-bottom:14px}
.footer-links a{color:var(--muted);transition:.2s}
.footer-links a:hover{color:var(--p)}
.disclaimer-box{background:var(--card2);border:1px solid var(--border);border-left:4px solid var(--warn);border-radius:8px;padding:16px 20px;max-width:700px;margin:0 auto 20px;text-align:left;font-size:.82rem;line-height:1.7}
.disclaimer-box h3{font-size:.9rem;margin-bottom:8px;color:var(--text);display:flex;align-items:center;gap:6px}

/* TOAST */
.toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%) translateY(80px);background:#fff;border:1px solid var(--border);color:var(--text);padding:12px 24px;border-radius:12px;font-size:.88rem;z-index:999;opacity:0;transition:.3s;pointer-events:none;box-shadow:0 8px 30px rgba(0,0,0,.12)}
.toast.show{transform:translateX(-50%) translateY(0);opacity:1}
.toast.success{border-color:var(--accent);color:#166534}
.toast.warn{border-color:var(--warn);color:#92400e}
.toast.error{border-color:var(--danger);color:#b91c1c}

@media(max-width:768px){
  .hero h1{font-size:1.5rem}
  .hero{padding:40px 0 70px}
  .input-card{padding:18px;border-radius:14px}
  .preview-card{grid-template-columns:1fr}
  .preview-thumb{width:100%;height:180px}
  .features{grid-template-columns:repeat(2,1fr);gap:10px}
  .steps-grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .header-links{display:none}
  .dl-buttons{flex-direction:column}
  .dl-btn{justify-content:center}
  .related-grid{grid-template-columns:1fr}
}