:root {
  --bg: #12143f;
  --panel: #1a1a45;
  --panel-2: #1d1d4d;
  --ink: #ececf7;
  --muted: #a9a9c8;
  --line: #2c2c58;
  --accent: #ff5a52;
  --accent-dark: #d92c26;
  --violet: #7a5cff;
  --teal: #17c9b8;
  --lav: #b9a7ff;
  --hl: #fff3a3;
}

* { box-sizing: border-box; }

body {
  margin: 0 auto;
  max-width: 1080px;
  padding: 24px 20px 64px;
  font: 16px/1.55 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
}

/* ---------- header ---------- */
header { margin-bottom: 20px; }
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.brand { font-size: 28px; font-weight: 800; letter-spacing: -0.02em; }
.brand::after { content: "."; color: var(--accent); }
.tagline { color: var(--muted); margin: 4px 0 0; }
.site-header nav { display: flex; gap: 18px; }
.site-header nav a { color: var(--muted); text-decoration: none; font-weight: 600; font-size: 15px; }
.site-header nav a:hover { color: var(--accent); }

/* ---------- hero ---------- */
.hero { padding: 0; }
.hero-banner {
  width: 100%;
  height: clamp(150px, 24vw, 250px);
  object-fit: cover;
  object-position: 32% 50%;
  display: block;
  -webkit-mask-image: linear-gradient(to bottom, #000 80%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 80%, transparent 100%);
}
.hero-text { max-width: 760px; }
.hero h1 { font-size: 40px; line-height: 1.12; margin: 0 0 14px; letter-spacing: -0.02em; }
.hero-sub { color: #c9c9e6; margin: 0 0 22px; font-size: 17px; }

#fetch-form { display: flex; gap: 8px; }
#url-input {
  flex: 1;
  min-width: 0;
  padding: 13px 14px;
  font-size: 16px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: #fff;
  color: #1b1b2e;
}
#fetch-btn {
  padding: 13px 18px;
  font-size: 16px;
  font-weight: 700;
  border: 0;
  border-radius: 10px;
  background: var(--accent-dark);
  color: #fff;
  cursor: pointer;
  white-space: nowrap;
}
#fetch-btn:hover { background: #b3261e; }
#fetch-btn:disabled { opacity: 0.55; cursor: wait; }

.status { min-height: 1.4em; color: var(--muted); margin: 12px 0 0; }
.status.error { color: #ff9d97; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; margin: 14px 0 6px; padding: 0; }
.chips li {
  border: 1px solid rgba(255,255,255,0.28);
  color: #e8e8f6;
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 13.5px;
  font-weight: 600;
}

/* ---------- result ---------- */
#result { margin-top: 28px; }
#video-title { font-size: 20px; margin: 8px 0 12px; }

.player-wrap {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 16px;
}
.player-wrap iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 8px;
}
.toolbar .toggle { display: flex; align-items: center; gap: 6px; color: var(--muted); }
#search {
  flex: 1;
  min-width: 160px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 15px;
  background: #fff;
  color: #1b1b2e;
}
.search-count { color: var(--muted); font-size: 14px; min-width: 3.5em; }
.toolbar button, .toolbar select {
  padding: 8px 12px;
  font-size: 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  color: var(--ink);
  cursor: pointer;
}

.transcript { padding-top: 6px; }
.sentence {
  margin: 0;
  padding: 6px 8px;
  border-radius: 6px;
  cursor: pointer;
}
.sentence:hover { background: rgba(255,255,255,0.06); }
.sentence .ts {
  color: var(--teal);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  margin-right: 8px;
  user-select: none;
}
.sentence.dim { opacity: 0.35; }
.sentence mark { background: var(--hl); color: #1b1b2e; padding: 0 1px; border-radius: 2px; }
body.hide-ts .sentence .ts { display: none; }

/* ---------- sections ---------- */
section { margin-top: 44px; }
section h2 { font-size: 26px; letter-spacing: -0.01em; margin: 0 0 16px; }

.features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 4px solid var(--violet);
  border-radius: 12px;
  padding: 18px 20px;
}
.card:nth-child(2) { border-top-color: var(--teal); }
.card:nth-child(3) { border-top-color: var(--violet); }
.card:nth-child(4) { border-top-color: var(--teal); }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); }

.steps { list-style: none; margin: 0 0 18px; padding: 0; display: grid; gap: 12px; }
.steps li { display: flex; gap: 14px; align-items: flex-start; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px 18px; }
.step-num {
  flex: none;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--accent-dark);
  color: #fff;
  font-weight: 800;
  display: flex; align-items: center; justify-content: center;
}
.steps li:nth-child(2) .step-num { background: var(--violet); }
.steps li:nth-child(3) .step-num { background: #0e9488; }

.sample {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
}
.sample-label { margin: 0 0 8px; font-size: 12.5px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--lav); }
.sample .sentence { cursor: default; }

.use-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.use-grid li { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; display: grid; gap: 4px; }
.use-grid span { color: var(--muted); }

.guide-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.guide-card {
  display: grid; gap: 6px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  text-decoration: none;
  color: var(--ink);
}
.guide-card:hover { border-color: var(--violet); }
.guide-card span { color: var(--muted); }

.faq details { border: 1px solid var(--line); border-radius: 10px; background: var(--panel); padding: 12px 16px; margin-bottom: 10px; }
.faq summary { font-weight: 700; cursor: pointer; }
.faq details p { margin: 8px 0 2px; color: var(--muted); }

.final-cta {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 34px 36px;
  text-align: center;
}
.final-cta h2 { margin: 0 0 16px; }
.cta-btn {
  display: inline-block;
  background: var(--accent-dark);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  padding: 12px 22px;
  border-radius: 10px;
}
.cta-btn:hover { background: #b3261e; }

/* ---------- article (guide pages) ---------- */
.article { max-width: 760px; }
.article h1 { font-size: 32px; line-height: 1.2; letter-spacing: -0.01em; margin: 6px 0 12px; }
.article h2 { font-size: 22px; margin: 28px 0 10px; }
.article p, .article li { color: #d8d8ee; }
.article a { color: var(--lav); }
.article ol, .article ul { padding-left: 22px; display: grid; gap: 8px; }
.article .cta-box {
  background: var(--panel-2); border: 1px solid var(--line);
  border-radius: 14px; padding: 22px 24px; margin-top: 30px;
}
.article .cta-box p { color: var(--muted); margin: 6px 0 14px; }
.article .cta-box .cta-btn { padding: 10px 18px; }

/* ---------- footer ---------- */
footer { margin-top: 48px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); padding-top: 18px; }
footer a { color: var(--muted); }

/* ---------- small screens ---------- */
@media (max-width: 760px) {
  .hero-banner { height: 150px; }
  .hero h1 { font-size: 30px; }
  .features, .guide-cards, .use-grid { grid-template-columns: 1fr; }
  #fetch-form { flex-direction: column; }
  #fetch-btn { width: 100%; }
}