/* MediaDown — mobile-first stylesheet */

:root {
  --bg: #f4f5fb;
  --bg-glow-1: rgba(99, 102, 241, 0.14);
  --bg-glow-2: rgba(168, 85, 247, 0.10);
  --card: #ffffff;
  --text: #101322;
  --muted: #5b6478;
  --line: #e4e7f2;
  --line-strong: #d4d9ea;
  --primary: #4f46e5;
  --primary-2: #7c3aed;
  --primary-soft: #eef2ff;
  --ok: #16a34a;
  --danger: #dc2626;
  --warn-bg: #fffbeb;
  --warn-text: #92400e;
  --info-bg: #eef2ff;
  --info-text: #3730a3;
  --err-bg: #fef2f2;
  --err-text: #b91c1c;
  --shadow-sm: 0 1px 2px rgba(16, 19, 34, 0.05);
  --shadow-md: 0 8px 24px -12px rgba(16, 19, 34, 0.22);
  --shadow-lg: 0 24px 60px -24px rgba(79, 70, 229, 0.35);
  --radius: 18px;
  --radius-sm: 12px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1017;
    --bg-glow-1: rgba(99, 102, 241, 0.20);
    --bg-glow-2: rgba(168, 85, 247, 0.14);
    --card: #161a24;
    --text: #e8eaf2;
    --muted: #98a1b3;
    --line: #262c3a;
    --line-strong: #333b4e;
    --primary-soft: #1d2140;
    --warn-bg: #2a2312;
    --warn-text: #fbbf24;
    --info-bg: #1b1f3d;
    --info-text: #a5b4fc;
    --err-bg: #2d1517;
    --err-text: #fca5a5;
    --shadow-md: 0 8px 24px -12px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 24px 60px -24px rgba(0, 0, 0, 0.7);
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
  background-image:
    radial-gradient(900px 480px at 12% -8%, var(--bg-glow-1), transparent 60%),
    radial-gradient(700px 420px at 92% 4%, var(--bg-glow-2), transparent 55%);
  background-repeat: no-repeat;
}

main {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 16px 24px;
}

.muted { color: var(--muted); }
.small { font-size: 13px; }
[hidden] { display: none !important; }

/* ---------- top bar ---------- */

.topbar {
  max-width: 860px;
  margin: 0 auto;
  padding: 18px 16px 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  box-shadow: var(--shadow-md);
}

.brand-mark svg { width: 18px; height: 18px; }

.brand-name { font-size: 17px; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 12.5px;
  color: var(--muted);
  border: 1px solid var(--line);
  background: var(--card);
  padding: 6px 12px;
  border-radius: 999px;
}

.live-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 3px rgba(22, 163, 74, 0.18);
}

/* ---------- hero ---------- */

.hero { padding: 34px 0 8px; text-align: center; }

.hero h1 {
  margin: 0 auto 14px;
  font-size: clamp(30px, 6.4vw, 46px);
  line-height: 1.16;
  letter-spacing: -0.025em;
  font-weight: 800;
  max-width: 640px;
}

.hero h1 em {
  font-style: normal;
  background: linear-gradient(100deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead {
  margin: 0 auto 24px;
  color: var(--muted);
  font-size: 15.5px;
  max-width: 560px;
}

.url-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: var(--shadow-lg);
}

.input-shell {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0 12px;
  min-height: 52px;
}

.input-icon { width: 18px; height: 18px; color: var(--muted); flex: none; }

.input-shell input {
  flex: 1;
  min-width: 0;
  border: 0;
  background: transparent;
  font: inherit;
  font-size: 16px; /* iOS: avoid zoom-on-focus */
  color: var(--text);
  padding: 12px 0;
  outline: none;
}

.input-shell input::placeholder { color: var(--muted); opacity: 0.75; }

.paste-btn {
  flex: none;
  border: 0;
  background: var(--primary-soft);
  color: var(--primary);
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: 9px;
  cursor: pointer;
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: 13px;
  font: inherit;
  font-size: 15px;
  font-weight: 600;
  padding: 13px 20px;
  min-height: 50px;
  cursor: pointer;
  text-decoration: none;
  color: var(--text);
  transition: transform 0.12s ease, box-shadow 0.12s ease, opacity 0.12s ease;
  -webkit-tap-highlight-color: transparent;
}

.btn:active { transform: scale(0.985); }
.btn[disabled] { opacity: 0.55; pointer-events: none; }

.btn.primary {
  background: linear-gradient(120deg, var(--primary), var(--primary-2));
  color: #fff;
  box-shadow: 0 10px 24px -12px rgba(79, 70, 229, 0.65);
}

.btn.secondary {
  background: var(--card);
  border-color: var(--line-strong);
}

.btn.ghost {
  background: transparent;
  color: var(--muted);
  border-color: transparent;
}

.btn .spinner { border-color: rgba(255, 255, 255, 0.35); border-top-color: #fff; }

/* ---------- platforms / notice ---------- */

.platforms {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 7px;
}

.platforms span {
  font-size: 12.5px;
  color: var(--muted);
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 999px;
  padding: 5px 11px;
}

.notice {
  margin-top: 18px;
  border-radius: var(--radius-sm);
  padding: 12px 15px;
  font-size: 14px;
  text-align: left;
  background: var(--info-bg);
  color: var(--info-text);
}

.notice.error { background: var(--err-bg); color: var(--err-text); }
.notice.warn { background: var(--warn-bg); color: var(--warn-text); }

/* ---------- cards ---------- */

.card {
  margin-top: 22px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 18px;
  scroll-margin-top: 16px;
}

/* preview */

.preview-top {
  display: grid;
  gap: 14px;
}

.thumb-wrap {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  background: var(--bg);
  aspect-ratio: 16 / 9;
}

.thumb-wrap img { width: 100%; height: 100%; object-fit: cover; display: block; }

.duration-badge {
  position: absolute;
  right: 8px;
  bottom: 8px;
  background: rgba(6, 8, 15, 0.78);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  border-radius: 7px;
  padding: 2px 8px;
  letter-spacing: 0.02em;
}

.preview-meta { display: flex; flex-direction: column; align-items: flex-start; gap: 7px; }

.meta-chip {
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-soft);
  border-radius: 7px;
  padding: 3px 9px;
}

.preview-meta h2 {
  margin: 0;
  font-size: 17px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  overflow-wrap: anywhere;
}

.preview-meta .muted { margin: 0; font-size: 13px; }

/* options */

.options-area { display: grid; gap: 20px; margin-top: 18px; }

.options-col h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px;
  font-size: 14px;
  color: var(--muted);
  font-weight: 600;
}

.options-col h3 svg { width: 16px; height: 16px; }
.options-col h3 small { font-weight: 500; color: var(--muted); font-size: 11.5px; }

.options { display: grid; gap: 9px; }

.option-row {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  text-align: left;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 14px;
  font: inherit;
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.14s ease, transform 0.14s ease, box-shadow 0.14s ease;
  -webkit-tap-highlight-color: transparent;
}

.option-row:hover, .option-row:focus-visible {
  border-color: var(--primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  outline: none;
}

.option-icon {
  flex: none;
  width: 38px;
  height: 38px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
}

.option-icon svg { width: 16px; height: 16px; }

.option-main { flex: 1; min-width: 0; }

.option-label { display: block; font-size: 15px; font-weight: 600; letter-spacing: -0.01em; }

.option-note {
  display: block;
  font-size: 12.5px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.option-side { flex: none; text-align: right; }

.option-size { display: block; font-size: 12px; color: var(--muted); }

.option-chevron { color: var(--primary); font-size: 16px; line-height: 1; }

/* job */

.job-head { display: flex; align-items: center; gap: 13px; }

.job-info { flex: 1; min-width: 0; }

.job-info h2 {
  margin: 0 0 2px;
  font-size: 15.5px;
  line-height: 1.4;
  overflow-wrap: anywhere;
}

.job-info .muted { margin: 0; font-size: 13px; }

.job-percent { font-size: 18px; font-variant-numeric: tabular-nums; }

.spinner {
  flex: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2.5px solid var(--line-strong);
  border-top-color: var(--primary);
  animation: spin 0.9s linear infinite;
}

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

.progress {
  margin-top: 14px;
  height: 9px;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--line);
  overflow: hidden;
}

.progress span {
  display: block;
  height: 100%;
  width: 4%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  transition: width 0.4s ease;
}

#job-meta:empty { display: none; }

/* result */

.result-head { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }

.result-head h2 { margin: 0; font-size: 16.5px; overflow-wrap: anywhere; }

.ok-dot {
  flex: none;
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 4px rgba(22, 163, 74, 0.16);
}

#result-player {
  width: 100%;
  max-height: min(58vh, 460px);
  border-radius: 14px;
  background: #000;
  display: block;
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.result-actions .btn { flex: 1 1 44%; min-width: 138px; }

.ios-hint {
  margin-top: 16px;
  background: var(--info-bg);
  color: var(--info-text);
  border-radius: var(--radius-sm);
  padding: 13px 15px;
  font-size: 13.5px;
}

.ios-hint ol { margin: 8px 0 0; padding-left: 18px; }
.ios-hint li { margin: 4px 0; }

/* ---------- login support (cookies) ---------- */

.cookie-card p { margin: 0 0 14px; font-size: 14px; }

.cookie-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.file-label { cursor: pointer; }

.cookie-status { margin-top: 12px; }

.cookie-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.cookie-actions .btn { flex: 0 1 auto; }

.cookie-help { margin-top: 14px; }

.cookie-help summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  color: var(--muted);
}

.cookie-help ol { margin: 8px 0 0; padding-left: 20px; color: var(--muted); font-size: 13.5px; }
.cookie-help li { margin: 4px 0; }

/* error card */

.error-card h2 { margin: 0 0 8px; font-size: 16.5px; color: var(--danger); }
.error-card p { margin: 0; color: var(--muted); font-size: 14.5px; overflow-wrap: anywhere; }

/* ---------- sections ---------- */

.section-title {
  text-align: center;
  font-size: clamp(21px, 4.5vw, 27px);
  letter-spacing: -0.02em;
  margin: 52px 0 20px;
}

.steps-grid { display: grid; gap: 12px; }

.step-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow-sm);
}

.step-index {
  display: inline-grid;
  place-items: center;
  width: 34px; height: 34px;
  border-radius: 10px;
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 700;
  font-size: 13px;
  margin-bottom: 10px;
}

.step-card h3 { margin: 0 0 5px; font-size: 16px; }
.step-card p { margin: 0; color: var(--muted); font-size: 14px; }

.features-grid { display: grid; gap: 12px; }

.features-grid article {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 17px;
}

.features-grid h3 { margin: 0 0 5px; font-size: 15.5px; }
.features-grid p { margin: 0; color: var(--muted); font-size: 13.5px; }

.faq { margin-top: 8px; }

.faq details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 15px 17px;
  margin-bottom: 10px;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 15px;
  list-style: none;
  position: relative;
  padding-right: 24px;
}

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

.faq summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  color: var(--primary);
  font-weight: 700;
  font-size: 18px;
  transition: transform 0.15s ease;
}

.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }

.faq details p { margin: 10px 0 2px; color: var(--muted); font-size: 14px; }

/* ---------- footer ---------- */

footer {
  text-align: center;
  padding: 34px 16px 46px;
  color: var(--muted);
  font-size: 13.5px;
}

footer p { margin: 4px 0; }
footer .small { font-size: 12px; opacity: 0.85; }

/* ---------- desktop ---------- */

@media (min-width: 640px) {
  .url-card { flex-direction: row; padding: 12px; }
  .input-shell { border: 0; background: transparent; padding-left: 14px; }
  .input-shell input { font-size: 15px; }
  .url-card .btn.primary { flex: none; border-radius: 14px; }
  .preview-top { grid-template-columns: 300px 1fr; align-items: start; }
  .options-area { grid-template-columns: 1fr 1fr; }
  .steps-grid { grid-template-columns: repeat(3, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .card { padding: 22px; }
}

@media (min-width: 900px) {
  .features-grid { grid-template-columns: repeat(4, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation-duration: 0.01ms !important; }
}