/* =============================================================
 * style.css — Theme TỐI kiểu tube-site (lưới thumbnail dày đặc)
 * Thiết kế riêng, trung tính. Màu nhấn: TÍM.
 * CSS thuần, responsive, không framework/CDN.
 * ============================================================= */

:root {
  --bg: #0e0e13;
  --bg-soft: #15151d;
  --surface: #1a1a24;
  --surface-2: #242433;
  --border: #2b2b3a;
  --text: #f3f3f6;
  --text-dim: #9a9aac;
  --accent: #8b5cf6;      /* tím */
  --accent-hover: #a78bfa;
  --accent-ink: #ffffff;
  --radius: 10px;
  --shadow: 0 14px 34px rgba(0, 0, 0, 0.55);
  --header-h: 60px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}
body { overflow-x: hidden; }

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ---------------- Header ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 clamp(12px, 3vw, 32px);
  background: #0a0a0f;
  border-bottom: 1px solid var(--border);
}
.brand {
  flex: 0 0 auto;
  font-weight: 900;
  font-size: 22px;
  letter-spacing: 0.5px;
  color: var(--accent);
  text-transform: uppercase;
  white-space: nowrap;
}
.brand span { color: var(--text); }

/* Thanh tìm kiếm ở giữa */
.search {
  flex: 1 1 auto;
  max-width: 560px;
  margin: 0 auto;
  display: flex;
  align-items: stretch;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  transition: border-color 0.2s;
}
.search:focus-within { border-color: var(--accent); }
.search-input {
  flex: 1 1 auto;
  min-width: 0;
  background: transparent;
  border: none;
  color: var(--text);
  font: inherit;
  font-size: 14px;
  padding: 9px 16px;
}
.search-input::placeholder { color: var(--text-dim); }
.search-input:focus { outline: none; }
.search-btn {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  border: none;
  background: var(--accent);
  color: var(--accent-ink);
  cursor: pointer;
  transition: background 0.2s;
}
.search-btn:hover { background: var(--accent-hover); }

.header-btn {
  flex: 0 0 auto;
  font-size: 14px;
  color: var(--text-dim);
  padding: 8px 12px;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
  white-space: nowrap;
}
.header-btn:hover { color: var(--text); background: var(--surface); }

/* ---------------- Toolbar (lọc/sắp xếp) ---------------- */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 20px;
  padding: 16px clamp(12px, 3vw, 32px) 4px;
}
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.chip-row + .chip-row { position: relative; }
.chip {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 7px 15px;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.18s, background 0.18s, border-color 0.18s;
  white-space: nowrap;
}
.chip:hover { color: var(--text); border-color: var(--accent); }
.chip.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

/* ---------------- Lưới thumbnail dày đặc ---------------- */
.grid-wrap { padding: 14px clamp(12px, 3vw, 32px) 60px; }
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 20px 16px;
}

/* ---------------- Card ---------------- */
.card {
  display: block;
  border-radius: var(--radius);
  overflow: hidden;
  background: transparent;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.card:hover { transform: translateY(-4px); }
.card:hover .card-thumb { box-shadow: var(--shadow); }
.card:hover .card-title { color: var(--accent-hover); }
.card:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.card-thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(135deg, #23233a, #14141d);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: box-shadow 0.18s ease;
}
.card-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}
/* Placeholder (icon phim) — luôn nằm dưới ảnh; hiện khi .is-empty. */
.card-ph {
  display: none;
  color: rgba(255, 255, 255, 0.28);
}
.card-thumb.is-empty .card-ph { display: block; }

.card-dur {
  position: absolute;
  right: 8px;
  bottom: 8px;
  z-index: 2;
  background: rgba(0, 0, 0, 0.82);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 5px;
  line-height: 1.4;
}
.card-body { padding: 9px 2px 2px; }
.card-title {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color 0.18s;
}
.card-meta {
  margin-top: 5px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-dim);
}
.card-cat {
  color: var(--accent-hover);
  font-weight: 600;
}
.card-date::before { content: "•"; margin-right: 8px; opacity: 0.6; }

/* ---------------- Tải thêm ---------------- */
.load-more-wrap { display: flex; justify-content: center; margin-top: 40px; }

/* ---------------- Nút ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 26px;
  border: none;
  border-radius: 8px;
  font: inherit;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s, background 0.2s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: var(--accent-hover); }
.btn-ghost { background: var(--surface); color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--surface-2); border-color: var(--accent); }

/* ---------------- Trạng thái rỗng / lỗi ---------------- */
.state {
  min-height: 50vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
  gap: 12px;
}
.state .icon { font-size: 60px; opacity: 0.75; }
.state h2 { margin: 0; font-size: 23px; }
.state p { margin: 0; color: var(--text-dim); max-width: 480px; line-height: 1.6; }

/* ---------------- Spinner ---------------- */
.spinner {
  width: 52px;
  height: 52px;
  border: 5px solid rgba(255, 255, 255, 0.16);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
 * TRANG XEM (watch.html)
 * ============================================================ */
.watch-main { max-width: 1180px; margin: 0 auto; padding: 20px clamp(12px, 3vw, 32px) 70px; }

.back-link { display: inline-flex; align-items: center; gap: 6px; color: var(--text-dim); font-size: 14px; margin-bottom: 14px; }
.back-link:hover { color: var(--text); }

.player-shell {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.player-shell video { width: 100%; height: 100%; background: #000; display: block; }

.player-spinner {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.35);
  pointer-events: none;
}
.player-spinner.show { display: flex; }

.player-error {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 12px;
  padding: 24px;
  background: rgba(0, 0, 0, 0.82);
}
.player-error.show { display: flex; }

.player-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 14px;
}
.quality-wrap { display: flex; align-items: center; gap: 8px; }
.quality-wrap label { font-size: 13px; color: var(--text-dim); }
select.quality {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}
select.quality:focus { outline: none; border-color: var(--accent); }
.hint { font-size: 12px; color: var(--text-dim); }

.watch-info { margin-top: 24px; }
.watch-title { margin: 0 0 10px; font-size: clamp(20px, 2.6vw, 30px); font-weight: 800; line-height: 1.25; }
.watch-meta { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; color: var(--text-dim); font-size: 14px; margin-bottom: 16px; }
.watch-cat {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 12px;
  font-weight: 700;
  padding: 3px 11px;
  border-radius: 999px;
}
.watch-desc { color: #cfcfd8; line-height: 1.7; font-size: 15px; }

/* Video liên quan — tái dùng .video-grid */
.suggest-title { font-size: 19px; font-weight: 800; margin: 38px 0 16px; }
.suggest-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }

/* ---------------- Responsive ---------------- */
/* Tablet: 3 cột (grid auto-fill tự lo, chỉ tinh chỉnh khoảng cách/header) */
@media (max-width: 900px) {
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
}

/* Mobile: 2 cột + header gọn */
@media (max-width: 640px) {
  .brand { font-size: 18px; }
  .header-btn { display: none; }
  .site-header { gap: 10px; }
  .video-grid { grid-template-columns: repeat(2, 1fr); gap: 16px 10px; }
  .suggest-grid { grid-template-columns: repeat(2, 1fr); }
  .card-title { font-size: 13px; }
  .grid-wrap { padding-left: 12px; padding-right: 12px; }
}

@media (max-width: 380px) {
  .video-grid { gap: 12px 8px; }
}