/* ============================================================
   YouTube Transcript Jump — Landing Page
   Design tokens follow LP/DESIGN.md
   ============================================================ */

:root {
  --bg: #09090b;
  --bg-raised: rgba(24, 24, 27, 0.5);
  --bg-raised-solid: #18181b;
  --bg-elev-2: rgba(39, 39, 42, 0.6);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #e4e4e7;
  --text-muted: #a1a1aa;
  --text-dim: #71717a;
  --text-strong: #fafafa;
  --accent: #7dd3fc;
  --accent-2: #a78bfa;

  --radius-card: 16px;
  --radius-pill: 9999px;
  --container: 1200px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Hiragino Sans",
    "Noto Sans JP", sans-serif;
  font-feature-settings: "cv11", "ss01";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

::selection {
  background: rgba(125, 211, 252, 0.25);
  color: var(--text-strong);
}

/* ============================================================
   Layout primitives
   ============================================================ */

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

@media (min-width: 1024px) {
  .container {
    padding-inline: 32px;
  }
}

section {
  padding-block: clamp(72px, 10vw, 128px);
}

.eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 16px;
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 10px;
  translate: 0 -2px;
  box-shadow: 0 0 12px rgba(125, 211, 252, 0.8);
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--text-strong);
  line-height: 1.07;
  letter-spacing: -0.02em;
  font-weight: 700;
}

h1 {
  font-size: clamp(44px, 6.5vw, 72px);
  letter-spacing: -0.025em;
}

h2 {
  font-size: clamp(32px, 4.2vw, 48px);
}

h3 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

p {
  margin: 0;
  color: var(--text-muted);
}

.lead {
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.6;
  color: var(--text-muted);
  max-width: 52ch;
}

.hl {
  color: var(--text-strong);
}

/* ============================================================
   Buttons
   ============================================================ */

.btn {
  --btn-bg: rgba(9, 9, 11, 0.6);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 44px;
  padding: 0 22px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  position: relative;
  background: var(--btn-bg);
  border: 1px solid var(--border-strong);
  transition: all 200ms var(--ease-out);
  white-space: nowrap;
}

.btn:hover {
  color: var(--text-strong);
  border-color: rgba(125, 211, 252, 0.5);
  box-shadow: 0 0 0 4px rgba(125, 211, 252, 0.08);
}

.btn--primary {
  background:
    linear-gradient(var(--btn-bg), var(--btn-bg)) padding-box,
    linear-gradient(135deg, #38bdf8 0%, #a78bfa 50%, #38bdf8 100%) border-box;
  border: 1px solid transparent;
  color: var(--text-strong);
}

.btn--primary::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: linear-gradient(135deg, #38bdf8 0%, #a78bfa 50%, #38bdf8 100%);
  z-index: -1;
  opacity: 0;
  filter: blur(10px);
  transition: opacity 220ms var(--ease-out);
}

.btn--primary:hover::after {
  opacity: 0.4;
}

.btn--ghost {
  background: transparent;
  border: none;
  padding: 0 4px;
  height: auto;
  color: var(--text-muted);
}

.btn--ghost:hover {
  color: var(--text-strong);
  border: none;
  box-shadow: none;
}

.btn-icon {
  width: 16px;
  height: 16px;
  stroke-width: 1.75;
}

/* ============================================================
   Nav
   ============================================================ */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  padding-block: 16px;
  background: rgba(9, 9, 11, 0.7);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms var(--ease-out);
}

.nav.is-scrolled {
  border-bottom-color: var(--border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-strong);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.brand__mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background:
    radial-gradient(120% 120% at 0% 0%, #38bdf8 0%, transparent 60%),
    linear-gradient(135deg, #1e293b, #0f172a);
  position: relative;
  display: grid;
  place-items: center;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.brand__mark::after {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: #f8fafc;
  clip-path: polygon(0 0, 100% 50%, 0 100%);
  transform: translateX(1px);
}

.nav__links {
  display: none;
  gap: 28px;
  font-size: 14px;
  color: var(--text-muted);
}

.nav__links a:hover {
  color: var(--text-strong);
}

@media (min-width: 768px) {
  .nav__links {
    display: flex;
  }
}

/* ============================================================
   Hero
   ============================================================ */

.hero {
  position: relative;
  padding-block: clamp(64px, 10vw, 120px) 0;
  isolation: isolate;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

.hero__bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(
      ellipse 70% 50% at 50% 0%,
      rgba(56, 189, 248, 0.18) 0%,
      rgba(167, 139, 250, 0.06) 35%,
      transparent 70%
    );
}

.hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
  background-position: center top;
  mask-image: radial-gradient(ellipse 60% 60% at 50% 30%, #000 40%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 30%, #000 40%, transparent 80%);
}

.starfield {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: -1;
}

.starfield span {
  position: absolute;
  width: 2px;
  height: 2px;
  border-radius: 50%;
  background: #fff;
}

.hero__inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.hero h1 {
  max-width: 14ch;
  margin-inline: auto;
}

.hero .lead {
  margin-inline: auto;
  text-align: center;
  max-width: 58ch;
}

.hero__cta {
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 4px;
}

.hero__trust {
  display: flex;
  gap: 16px;
  align-items: center;
  font-size: 13px;
  color: var(--text-dim);
  margin-top: 4px;
}

.hero__trust strong {
  color: var(--text);
  font-weight: 500;
}

.hero__mock {
  position: relative;
  margin-top: clamp(56px, 8vw, 96px);
  max-width: 1080px;
  margin-inline: auto;
  border-radius: 20px;
  padding: 8px;
  background:
    linear-gradient(180deg, rgba(39, 39, 42, 0.7), rgba(9, 9, 11, 0.7)) padding-box,
    linear-gradient(180deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.02))
      border-box;
  border: 1px solid transparent;
  box-shadow:
    0 30px 80px -20px rgba(0, 0, 0, 0.7),
    0 0 0 1px rgba(255, 255, 255, 0.04) inset;
}

.hero__mock img {
  border-radius: 14px;
  width: 100%;
  height: auto;
  display: block;
}

/* ============================================================
   Bridge / intro statement
   ============================================================ */

.bridge {
  padding-block: clamp(72px, 9vw, 112px);
}

.bridge__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

@media (min-width: 900px) {
  .bridge__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 64px;
    align-items: end;
  }
}

.bridge h2 {
  max-width: 16ch;
}

.bridge p {
  font-size: clamp(17px, 1.5vw, 19px);
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 60ch;
}

/* ============================================================
   Feature grid
   ============================================================ */

.features__head {
  max-width: 720px;
  margin-bottom: 56px;
}

.features__head h2 {
  margin-bottom: 16px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 20px;
}

@media (min-width: 1024px) {
  .grid {
    gap: 24px;
  }
}

.card {
  grid-column: span 12;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  overflow: hidden;
  transition: border-color 220ms var(--ease-out),
    transform 220ms var(--ease-out);
}

.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.card--image {
  padding: 0;
  gap: 0;
}

.card--image .card__body {
  padding: 24px 28px 28px;
}

.card__media {
  position: relative;
  background: #000;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

.card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
}

.card__media--contain img {
  object-fit: contain;
  background: #000;
}

/* UI-only sidebar crop: portrait canvas, shows the sidebar on a neutral
   backdrop so the design doesn't have to fight YouTube's player pixels. */
.card__media--ui {
  aspect-ratio: 5 / 7;
  background:
    radial-gradient(
      ellipse 80% 60% at 50% 0%,
      rgba(56, 189, 248, 0.14),
      transparent 70%
    ),
    linear-gradient(180deg, #111216 0%, #0a0b0e 100%);
  border-bottom: 1px solid var(--border);
  padding: 28px 28px 0;
  display: grid;
  place-items: start center;
}

.card__media--ui img {
  width: 100%;
  max-width: 320px;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  border-radius: 12px 12px 0 0;
  box-shadow:
    0 24px 50px -20px rgba(0, 0, 0, 0.7),
    0 0 0 1px rgba(255, 255, 255, 0.06);
}

.card__media--ui.card__media--dark {
  background:
    radial-gradient(
      ellipse 80% 60% at 50% 0%,
      rgba(167, 139, 250, 0.14),
      transparent 70%
    ),
    linear-gradient(180deg, #0b0c10 0%, #070709 100%);
}

.card__tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: rgba(125, 211, 252, 0.12);
  color: #bae6fd;
  border: 1px solid rgba(125, 211, 252, 0.25);
  padding: 3px 8px;
  border-radius: 4px;
  width: fit-content;
}

.card__tag--muted {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
  border-color: var(--border);
}

.card h3 {
  margin: 0;
}

.card p {
  font-size: 14.5px;
  line-height: 1.55;
}

@media (min-width: 768px) {
  .col-4 { grid-column: span 6; }
  .col-6 { grid-column: span 6; }
  .col-7 { grid-column: span 12; }
  .col-5 { grid-column: span 12; }
  .col-8 { grid-column: span 12; }
  .col-12 { grid-column: span 12; }
}

@media (min-width: 1024px) {
  .col-4 { grid-column: span 4; }
  .col-5 { grid-column: span 5; }
  .col-6 { grid-column: span 6; }
  .col-7 { grid-column: span 7; }
  .col-8 { grid-column: span 8; }
  .col-12 { grid-column: span 12; }
}

.card--wide .card__media {
  aspect-ratio: 16 / 8;
}

.card--tall .card__media {
  aspect-ratio: 4 / 3;
}

.card--hero-dark {
  background:
    radial-gradient(
      ellipse at 0% 0%,
      rgba(56, 189, 248, 0.1),
      transparent 60%
    ),
    var(--bg-raised-solid);
}

.card--hero-dark .card__media {
  aspect-ratio: 16 / 7;
  background: #000;
}

/* ============================================================
   How it works
   ============================================================ */

.steps__head {
  max-width: 720px;
  margin-bottom: 56px;
}

.steps__list {
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
  counter-reset: step;
}

@media (min-width: 768px) {
  .steps__list {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
}

.step {
  position: relative;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: var(--bg-raised);
  counter-increment: step;
}

.step::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: 24px;
  right: 28px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}

.step__icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text-strong);
  margin-bottom: 16px;
}

.step__icon svg {
  width: 18px;
  height: 18px;
  stroke-width: 1.75;
}

.step h3 {
  margin-bottom: 6px;
}

.step p {
  font-size: 14.5px;
}

/* ============================================================
   Pricing
   ============================================================ */

.pricing__head {
  max-width: 720px;
  margin-bottom: 56px;
}

.plans {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 900px) {
  .plans {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
    max-width: 720px;
    margin: 0 auto;
  }
}

.plan {
  position: relative;
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: var(--bg-raised);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.plan--featured {
  background:
    radial-gradient(
      120% 80% at 100% 0%,
      rgba(125, 211, 252, 0.12),
      transparent 60%
    ),
    var(--bg-raised-solid);
  border-color: rgba(125, 211, 252, 0.35);
}

.plan__badge {
  position: absolute;
  top: -10px;
  right: 24px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  background: linear-gradient(135deg, #38bdf8, #a78bfa);
  color: #0b1120;
}

.plan__name {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.plan__price {
  display: flex;
  align-items: baseline;
  gap: 6px;
  color: var(--text-strong);
}

.plan__price b {
  font-size: 44px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
}

.plan__price span {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
}

.plan__billing {
  font-size: 13px;
  color: var(--text-dim);
}

.plan__features {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 14.5px;
  color: var(--text-muted);
  flex: 1;
}

.plan__features li {
  position: relative;
  padding-left: 24px;
}

.plan__features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 14px;
  height: 8px;
  border-left: 1.5px solid var(--accent);
  border-bottom: 1.5px solid var(--accent);
  transform: rotate(-45deg);
}

.plan .btn {
  width: 100%;
  justify-content: center;
}

/* ============================================================
   FAQ
   ============================================================ */

.faq__head {
  max-width: 720px;
  margin-bottom: 40px;
}

.faq__list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
}

.faq__list details {
  border-bottom: 1px solid var(--border);
  padding-block: 20px;
}

.faq__list summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 17px;
  font-weight: 500;
  color: var(--text-strong);
  padding-block: 4px;
}

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

.faq__list summary::after {
  content: "";
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23a1a1aa' stroke-width='1.75' stroke-linecap='round' stroke-linejoin='round'><path d='M12 5v14M5 12h14'/></svg>");
  background-size: contain;
  background-repeat: no-repeat;
  transition: transform 200ms var(--ease-out);
}

.faq__list details[open] summary::after {
  transform: rotate(45deg);
}

.faq__list details p {
  margin-top: 12px;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.65;
}

/* ============================================================
   CTA footer
   ============================================================ */

.cta-final {
  position: relative;
  padding-block: clamp(96px, 12vw, 160px);
  text-align: center;
  overflow: hidden;
  isolation: isolate;
}

.cta-final::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse 50% 70% at 50% 100%,
    rgba(56, 189, 248, 0.18),
    transparent 70%
  );
  z-index: -1;
}

.cta-final h2 {
  max-width: 18ch;
  margin-inline: auto;
  margin-bottom: 20px;
}

.cta-final p {
  max-width: 52ch;
  margin-inline: auto;
  margin-bottom: 28px;
}

.cta-final .hero__cta {
  justify-content: center;
}

/* ============================================================
   Footer
   ============================================================ */

.footer {
  border-top: 1px solid var(--border);
  padding-block: 48px;
  font-size: 13px;
  color: var(--text-dim);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  justify-content: space-between;
  align-items: center;
}

.footer__links {
  display: flex;
  gap: 24px;
}

.footer__links a:hover {
  color: var(--text);
}

/* ============================================================
   Reveal animation
   ============================================================ */

.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 600ms var(--ease-out),
    transform 600ms var(--ease-out);
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
  html {
    scroll-behavior: auto;
  }
}