/* Site tải TikTok — CSS viết tay, ưu tiên điện thoại. Không phông ngoài, không framework.
   Tinh thần docs/conventions/ui.md: nền sáng, viền mảnh, bo góc, không đổ bóng trên thẻ, một màu nhấn,
   vùng chạm ≥ 40px, ô nhập 16px (chống iOS tự phóng to), màu hex (không oklch). */

:root {
  --bg: #ffffff;
  --band: #f8fafc;
  --card: #ffffff;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --text: #111827;
  --muted: #4b5563;
  --faint: #6b7280;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-soft: #eef2ff;
  --accent-text: #4338ca;
  --danger: #b91c1c;
  --danger-soft: #fef2f2;
  --radius: 12px;
  --radius-sm: 8px;
  --wrap: 1040px;
  --narrow: 720px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f17;
    --band: #111827;
    --card: #111827;
    --border: #1f2937;
    --border-strong: #374151;
    --text: #f3f4f6;
    --muted: #d1d5db;
    --faint: #9ca3af;
    --accent-soft: #1e1b4b;
    --accent-text: #a5b4fc;
    --danger: #fca5a5;
    --danger-soft: #2a1215;
    color-scheme: dark;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--accent-text);
}

h1,
h2,
h3 {
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0;
}

h2 {
  font-size: 22px;
  margin-bottom: 16px;
}

h3 {
  font-size: 16px;
}

p {
  margin: 0;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.sr-only,
.hp {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  inset-inline-start: 8px;
  top: -48px;
  z-index: 10;
  padding: 8px 12px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  top: 8px;
}

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 16px;
}

.narrow {
  max-width: var(--narrow);
}

/* ── Đầu trang ── */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 56px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-weight: 700;
  font-size: 17px;
  text-decoration: none;
  min-height: 40px;
}

.logo-mark {
  color: var(--accent);
  flex: none;
}

.main-nav {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  min-width: 0;
}

.main-nav::-webkit-scrollbar {
  display: none;
}

.main-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 12px;
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
}

.main-nav a:hover {
  background: var(--band);
  color: var(--text);
}

.main-nav a[aria-current='page'] {
  color: var(--accent-text);
  background: var(--accent-soft);
}

@media (max-width: 767px) {
  .main-nav {
    width: calc(100% + 32px);
    margin: 0 -16px;
    padding: 0 12px 8px;
  }
}

/* ── Menu ngôn ngữ ── */
.lang-menu {
  position: relative;
  order: 3;
}

.lang-menu summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 40px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  white-space: nowrap;
}

.lang-menu summary::-webkit-details-marker {
  display: none;
}

.lang-menu[open] summary {
  border-color: var(--accent);
  color: var(--text);
}

.lang-menu ul {
  position: absolute;
  inset-inline-end: 0;
  top: calc(100% + 6px);
  z-index: 20;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  width: min(340px, calc(100vw - 32px));
  max-height: min(420px, 70vh);
  overflow-y: auto;
  margin: 0;
  padding: 6px;
  list-style: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.14);
}

.lang-menu li a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 0 10px;
  border-radius: 6px;
  color: var(--text);
  font-size: 14px;
  text-decoration: none;
}

.lang-menu li a:hover {
  background: var(--band);
}

.lang-menu li a[aria-current] {
  background: var(--accent-soft);
  color: var(--accent-text);
  font-weight: 600;
}

@media (max-width: 767px) {
  .brand {
    order: 1;
  }

  .lang-menu {
    order: 2;
    margin-inline-start: auto;
  }

  .main-nav {
    order: 3;
  }
}

@media (min-width: 768px) {
  .main-nav {
    margin-inline-start: auto;
  }
}

/* ── Khối mở đầu + ô dán link ── */
.hero {
  background: var(--band);
  border-bottom: 1px solid var(--border);
  padding: 32px 0 36px;
  text-align: center;
}

.hero h1,
.page-head h1 {
  font-size: 28px;
  font-weight: 800;
}

.lead {
  margin-top: 8px;
  color: var(--muted);
  font-size: 16px;
}

.tool-tabs {
  display: inline-flex;
  margin: 20px auto 0;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
}

.tool-tabs a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  border-radius: 7px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

.tool-tabs a[aria-current='page'] {
  background: var(--accent);
  color: #fff;
}

.dl-form {
  margin-top: 16px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  text-align: start;
}

.field {
  position: relative;
  display: flex;
  align-items: center;
}

.field input {
  width: 100%;
  min-width: 0;
  height: 52px;
  padding-block: 0;
  padding-inline: 14px 84px;
  /* Link luôn là chữ Latin: chữ tự theo nội dung, còn chỗ chừa cho nút Dán/Xoá vẫn theo chiều trang
     (dùng dir="auto" thì chỗ chừa đổi bên và nút đè lên link trên trang tiếng Ả Rập). */
  unicode-bidi: plaintext;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
}

.field input::placeholder {
  color: var(--faint);
}

.field input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font: inherit;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  text-decoration: none;
}

.btn:disabled {
  opacity: 0.65;
  cursor: progress;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--accent-text);
}

.btn-outline {
  background: var(--card);
  border-color: var(--border-strong);
  color: var(--text);
}

.field .btn-ghost {
  position: absolute;
  inset-inline-end: 4px;
  min-height: 44px;
  padding: 0 12px;
  font-size: 14px;
}

#dl-submit {
  width: 100%;
  min-height: 52px;
  margin-top: 10px;
  font-size: 16px;
}

.turnstile:not(:empty) {
  margin-top: 10px;
}

.hint {
  margin-top: 10px;
  color: var(--faint);
  font-size: 13px;
}

.form-error {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 14px;
}

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.45);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (min-width: 768px) {
  .hero {
    padding: 48px 0 52px;
  }

  .hero h1,
  .page-head h1 {
    font-size: 40px;
  }

  .lead {
    font-size: 18px;
  }

  .dl-form {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    column-gap: 10px;
  }

  .dl-form > :not(.field):not(#dl-submit):not(.hp) {
    grid-column: 1 / -1;
  }

  #dl-submit {
    width: auto;
    margin-top: 0;
    padding: 0 28px;
  }
}

/* ── Kết quả ── */
.result {
  margin-top: 16px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  text-align: start;
}

.result-head {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.result-cover {
  width: 96px;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background: var(--band);
}

.result-title {
  font-size: 15px;
  font-weight: 600;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  overflow-wrap: anywhere;
}

.result-meta {
  margin-top: 4px;
  color: var(--faint);
  font-size: 13px;
  overflow-wrap: anywhere;
}

.dl-list {
  display: grid;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.dl-btn {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 2px 12px;
  min-height: 56px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #fff;
  text-decoration: none;
}

.dl-btn:hover {
  background: var(--accent-hover);
}

.dl-btn.secondary {
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border-strong);
}

.dl-btn.secondary:hover {
  background: var(--band);
}

.dl-label {
  font-weight: 700;
  font-size: 15px;
}

.dl-note {
  grid-column: 1;
  font-size: 12px;
  opacity: 0.85;
}

.dl-size {
  grid-row: 1 / span 2;
  grid-column: 2;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  opacity: 0.9;
}

.photo-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.photo-grid figure {
  margin: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--band);
}

.photo-grid img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.photo-grid a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border-top: 1px solid var(--border);
}

.result-actions {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.result-actions .btn {
  width: 100%;
}

.result-note {
  margin-top: 12px;
  color: var(--faint);
  font-size: 12px;
  text-align: center;
}

@media (min-width: 768px) {
  .result-head {
    grid-template-columns: 120px minmax(0, 1fr);
  }

  .result-cover {
    width: 120px;
  }

  .photo-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ── Ô quảng cáo Ganet ── */
/* Thẻ Ganet tự dựng khung giữ chỗ bên trong; ô không tự giữ chiều cao (không quảng cáo ⇒ không khoảng trống). */
.ad-slot {
  margin: 20px auto 0;
  text-align: center;
  max-width: 100%;
  overflow: hidden;
}

/* Nhãn chỉ hiện khi Google đã vẽ quảng cáo vào ô — ô trống không để lại dòng chữ mồ côi. */
.ad-slot:has(iframe)::before {
  content: attr(data-ad-label);
  display: block;
  margin-bottom: 4px;
  color: var(--faint);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.section + .wrap > .ad-slot {
  margin-top: 32px;
}

/* ── Các khối nội dung ── */
.section {
  padding: 40px 0 0;
}

.section:last-of-type {
  padding-bottom: 48px;
}

.page-head {
  padding: 32px 0 0;
}

.page-head .meta {
  margin-top: 6px;
  color: var(--faint);
  font-size: 14px;
}

.steps,
.features {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.steps li,
.features li {
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
}

.steps p,
.features p {
  margin-top: 6px;
  color: var(--muted);
  font-size: 15px;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  margin-bottom: 10px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-text);
  font-weight: 700;
  font-size: 14px;
}

@media (min-width: 768px) {
  .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .features {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .features {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.prose p + p {
  margin-top: 14px;
}

.prose p {
  color: var(--muted);
}

.prose h2 {
  margin: 32px 0 12px;
  font-size: 20px;
}

.prose h2:first-child {
  margin-top: 0;
}

.guide-steps {
  margin: 0;
  padding-inline-start: 22px;
  color: var(--muted);
}

.guide-steps li + li {
  margin-top: 8px;
}

.faq {
  border-top: 1px solid var(--border);
}

.faq details {
  border-bottom: 1px solid var(--border);
}

.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 52px;
  padding: 12px 0;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: '+';
  flex: none;
  color: var(--faint);
  font-size: 22px;
  font-weight: 400;
  line-height: 1;
}

.faq details[open] summary::after {
  content: '−';
}

.faq details p {
  padding: 0 0 16px;
  color: var(--muted);
}

.cta {
  margin-top: 28px;
}

/* ── Chân trang ── */
.site-footer {
  margin-top: 48px;
  padding: 32px 0 24px;
  border-top: 1px solid var(--border);
  background: var(--band);
  font-size: 14px;
}

.footer-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.footer-brand {
  grid-column: 1 / -1;
}

.footer-brand p {
  margin-top: 8px;
  color: var(--faint);
  max-width: 420px;
}

.site-footer h2 {
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--faint);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.site-footer ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer li a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  color: var(--muted);
  text-decoration: none;
}

.site-footer li a:hover {
  color: var(--text);
}

.footer-bottom {
  margin-top: 24px;
  color: var(--faint);
  font-size: 13px;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }

  .footer-brand {
    grid-column: auto;
  }
}