/*
Theme Name: Tải Video Facebook
Theme URI: https://emarketer.com.vn/
Author: eMarketer
Description: Theme tải video Facebook không watermark — trang chủ landing tối ưu, tiếng Việt.
Version: 1.0
License: GNU General Public License v2 or later
Text Domain: taivideofb
*/

:root{
  --fb:#1877f2;
  --fb-dark:#0b5ed7;
  --grad:linear-gradient(135deg,#1877f2 0%,#00c6ff 100%);
  --bg:#f0f2f5;
  --card:#ffffff;
  --text:#0f1419;
  --text-2:#65676b;
  --border:#e4e6eb;
  --radius:16px;
  --shadow:0 6px 24px rgba(24,119,242,.12);
  --font:'Segoe UI',system-ui,-apple-system,Roboto,'Helvetica Neue',Arial,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.65}
img{max-width:100%;height:auto;display:block}
a{color:var(--fb);text-decoration:none}
.container{max-width:1080px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}
.header-inner{display:flex;align-items:center;gap:14px;height:62px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.2rem;color:var(--text)}
.brand .logo{width:36px;height:36px;border-radius:10px;background:var(--grad);display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.2rem}
.main-nav{margin-left:auto;display:flex;gap:6px}
.main-nav a{padding:8px 14px;border-radius:99px;color:var(--text-2);font-weight:600;font-size:.92rem}
.main-nav a:hover{background:var(--bg);color:var(--fb)}
@media(max-width:720px){.main-nav{display:none}}

/* Hero */
.hero{background:var(--grad);color:#fff;padding:52px 0 60px;text-align:center;position:relative}
.hero h1{font-size:clamp(1.7rem,4.5vw,2.6rem);font-weight:800;letter-spacing:-.02em;line-height:1.25}
.hero p.sub{max-width:640px;margin:14px auto 0;font-size:1.06rem;opacity:.95}
.badge{display:inline-block;background:rgba(255,255,255,.18);padding:6px 16px;border-radius:99px;font-size:.85rem;font-weight:600;margin-bottom:16px}

/* Downloader box */
.dl-wrap{max-width:720px;margin:26px auto 0}
.dl-box{background:#fff;border-radius:18px;padding:12px;box-shadow:0 12px 40px rgba(0,0,0,.18);display:flex;gap:10px;flex-wrap:wrap}
.dl-box input{flex:1;min-width:220px;border:none;outline:none;font-size:1rem;padding:14px 16px;color:var(--text);font-family:var(--font);background:transparent}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;cursor:pointer;font-family:var(--font);font-weight:700;font-size:1rem;padding:14px 26px;border-radius:12px;transition:.2s}
.btn-primary{background:var(--grad);color:#fff}
.btn-primary:hover{filter:brightness(1.06);transform:translateY(-1px)}
.btn-ghost{background:var(--bg);color:var(--text)}
.btn-ghost:hover{background:var(--border)}
.dl-hint{margin-top:14px;font-size:.9rem;opacity:.9}
.dl-hint a{color:#fff;text-decoration:underline}

/* Result */
.dl-result{max-width:720px;margin:20px auto 0;display:none}
.dl-result.show{display:block}
.result-card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;text-align:left;color:var(--text)}
.result-body{display:flex;gap:16px;padding:18px;flex-wrap:wrap;align-items:flex-start}
.result-thumb{width:180px;max-width:40vw;border-radius:12px;background:#000;aspect-ratio:16/9;object-fit:cover;flex-shrink:0}
.result-info{flex:1;min-width:220px}
.result-info h3{font-size:1.05rem;line-height:1.4;margin-bottom:6px}
.result-meta{font-size:.85rem;color:var(--text-2);margin-bottom:12px}
.dl-formats{display:flex;flex-direction:column;gap:8px}
.fmt{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:10px 14px;flex-wrap:wrap}
.fmt .fmt-label{font-weight:700;font-size:.92rem}
.fmt .fmt-sub{font-size:.8rem;color:var(--text-2)}
.fmt a.btn{padding:9px 18px;font-size:.9rem}
.spinner{width:22px;height:22px;border:3px solid #dbe7ff;border-top-color:var(--fb);border-radius:50%;animation:spin .8s linear infinite;display:inline-block;vertical-align:middle;margin-right:8px}
@keyframes spin{to{transform:rotate(360deg)}}
.msg-box{padding:18px;text-align:center;color:var(--text-2);font-size:.95rem}
.msg-box.err{color:#d33}

/* Sections */
section{padding:56px 0}
.section h2{text-align:center;font-size:clamp(1.4rem,3vw,1.9rem);font-weight:800;letter-spacing:-.02em;margin-bottom:8px}
.section .lead{text-align:center;color:var(--text-2);max-width:620px;margin:0 auto 34px}
.steps,.features{display:grid;gap:18px}
.steps{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.features{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:26px 22px;transition:.25s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.step .num{width:42px;height:42px;border-radius:12px;background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.1rem;margin-bottom:14px}
.step h3,.feature h3{font-size:1.05rem;margin-bottom:6px}
.step p,.feature p{color:var(--text-2);font-size:.93rem}
.feature .ico{font-size:1.7rem;margin-bottom:10px}
.alt{background:#fff}
.prose{max-width:760px;margin:0 auto}
.prose h2{text-align:left}
.prose p{color:var(--text-2);margin-bottom:14px}
.prose ul{margin:0 0 16px 22px;color:var(--text-2)}
.prose li{margin-bottom:8px}
.prose strong{color:var(--text)}

/* FAQ */
.faq{max-width:760px;margin:0 auto}
.faq details{background:#fff;border:1px solid var(--border);border-radius:12px;margin-bottom:12px;overflow:hidden}
.faq summary{cursor:pointer;padding:16px 20px;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--fb);font-size:1.3rem}
.faq details[open] summary::after{content:"−"}
.faq .a{padding:0 20px 16px;color:var(--text-2);font-size:.94rem}

/* Footer */
.site-footer{background:#fff;border-top:1px solid var(--border);padding:36px 0;margin-top:20px;text-align:center;color:var(--text-2);font-size:.9rem}
.site-footer .brand{justify-content:center;margin-bottom:10px}
.site-footer .disc{max-width:640px;margin:8px auto 0;font-size:.82rem}