:root {
  --bg: #f7f7f4;
  --surface: rgba(255, 255, 255, 0.78);
  --surface-strong: rgba(255, 255, 255, 0.94);
  --text: #111111;
  --muted: #5f5f63;
  --line: rgba(17, 17, 17, 0.08);
  --line-strong: rgba(17, 17, 17, 0.14);
  --shadow-soft: 0 30px 80px rgba(15, 18, 26, 0.08);
  --shadow-panel: 0 40px 120px rgba(15, 18, 26, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: linear-gradient(180deg, #ffffff 0%, #f7f7f4 100%);
  color: var(--text);
  font-family: "Noto Sans SC", sans-serif;
  overflow-x: hidden;
}

main,
section,
article,
div {
  min-width: 0;
}

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

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

.ambient {
  position: fixed;
  inset: auto auto 0 0;
  width: 42vw;
  height: 42vw;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.42;
  pointer-events: none;
  z-index: 0;
}

.ambient-one {
  top: -10vw;
  left: -8vw;
  background: radial-gradient(circle, rgba(209, 228, 255, 0.9), rgba(209, 228, 255, 0) 68%);
}

.ambient-two {
  right: -10vw;
  bottom: -8vw;
  left: auto;
  background: radial-gradient(circle, rgba(233, 237, 244, 0.95), rgba(233, 237, 244, 0) 68%);
}

.site-shell {
  position: relative;
  z-index: 1;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 24px 0 96px;
}

.site-header {
  position: sticky;
  top: 16px;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(18px);
  box-shadow: 0 12px 32px rgba(15, 18, 26, 0.05);
}

.brand {
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: 0.03em;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.site-nav a {
  color: var(--muted);
  transition: color 180ms ease;
}

.site-nav a.active,
.site-nav a:hover {
  color: var(--text);
}

.hero {
  display: grid;
  gap: 36px;
  align-items: center;
  padding: 80px 0 24px;
}

.hero-premium {
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.9fr);
  min-height: calc(100vh - 120px);
}

.hero-copy {
  max-width: 720px;
}

.eyebrow,
.label,
.panel-index,
.device-label,
.mini-card span {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 18px;
  font-size: clamp(2.8rem, 6vw, 5.8rem);
  line-height: 0.98;
  letter-spacing: -0.05em;
}

h2 {
  margin: 0 0 12px;
  font-size: clamp(1.35rem, 2.5vw, 2.2rem);
  line-height: 1.16;
  letter-spacing: -0.03em;
}

h3 {
  margin: 0 0 10px;
  font-size: 1.4rem;
  line-height: 1.2;
}

.lead,
.content-card p,
.feature-panel p,
.plain-list li,
.summary-card li,
.mini-card strong,
.device-screen p {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.8;
}

.lead-wide {
  max-width: 680px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 148px;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(10px);
  transition: transform 220ms ease, box-shadow 220ms ease, background 220ms ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(15, 18, 26, 0.08);
}

.button-primary {
  background: #111111;
  border-color: #111111;
  color: #ffffff;
}

.hero-device,
.summary-card,
.content-card,
.feature-panel,
.mini-card,
.photo-card {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--surface);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-soft);
}

.hero-device {
  min-height: 620px;
  overflow: hidden;
  padding: 18px;
}

.device-glow {
  position: absolute;
  inset: 10% 6% auto auto;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(202, 223, 255, 0.85), rgba(202, 223, 255, 0) 70%);
  filter: blur(24px);
}

.device-frame {
  position: relative;
  height: 100%;
  border: 1px solid rgba(17, 17, 17, 0.08);
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(244, 246, 250, 0.85));
  overflow: hidden;
}

.device-topline {
  height: 52px;
  border-bottom: 1px solid rgba(17, 17, 17, 0.06);
  background: linear-gradient(90deg, rgba(255,255,255,0.9), rgba(243,245,248,0.9));
}

.device-screen {
  padding: 34px;
}

.device-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
}

.device-stats div {
  padding: 18px;
  border: 1px solid rgba(17, 17, 17, 0.06);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.6);
}

.device-stats span {
  display: block;
  color: var(--muted);
  font-size: 0.86rem;
  margin-bottom: 6px;
}

.device-stats strong {
  font-size: 1.1rem;
}

.cinema-section,
.split-showcase,
.page-layout {
  padding-top: 48px;
}

.section-heading,
.page-intro {
  max-width: 760px;
  margin-bottom: 28px;
}

.feature-stack {
  display: grid;
  gap: 18px;
}

.feature-panel {
  padding: 28px;
}

.split-showcase {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 24px;
  align-items: start;
}

.showcase-grid,
.cards-grid,
.timeline-grid,
.portrait-stage,
.photo-layout {
  display: grid;
  gap: 20px;
}

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

.mini-card {
  min-height: 180px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.mini-card strong {
  color: var(--text);
  font-size: 1.35rem;
  line-height: 1.3;
}

.content-card {
  padding: 26px;
}

.hero-card {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 24px;
  align-items: start;
}

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

.cards-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.cards-grid-wide .content-card {
  min-height: 260px;
}

.plain-list {
  margin: 0;
  padding-left: 18px;
}

.text-link {
  display: inline-block;
  margin-top: 10px;
  color: var(--text);
  font-weight: 700;
}

.portrait-shell {
  position: relative;
  padding: 30px;
}

.portrait-backdrop {
  position: absolute;
  inset: 5% 10%;
  border-radius: 40px;
  background:
    radial-gradient(circle at top, rgba(212, 224, 243, 0.85), rgba(212, 224, 243, 0) 55%),
    linear-gradient(180deg, rgba(255,255,255,0.95), rgba(240,243,248,0.8));
  filter: blur(0.5px);
}

.photo-card {
  padding: 16px;
  background: var(--surface-strong);
}

.portrait-card {
  position: relative;
  z-index: 1;
}

.portrait-image {
  width: 100%;
  max-width: 460px;
  margin: 0 auto;
  border-radius: 22px;
}

.photo-fallback {
  display: none;
  padding: 72px 24px;
  text-align: center;
  color: var(--muted);
  line-height: 1.8;
}

.reveal {
  --reveal-y: 34px;
  --reveal-scale: 0.985;
  --parallax-offset: 0px;
  opacity: 0;
  transform: translate3d(0, calc(var(--reveal-y) + var(--parallax-offset)), 0) scale(var(--reveal-scale));
  transition:
    opacity 520ms cubic-bezier(0.22, 1, 0.36, 1),
    transform 700ms cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: var(--reveal-delay, 0s);
}

.reveal.is-visible {
  --reveal-y: 0px;
  --reveal-scale: 1;
  opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal,
  .button,
  .site-nav a {
    transition: none !important;
    transform: none !important;
    opacity: 1 !important;
  }
}

@media (max-width: 960px) {
  .hero-premium,
  .split-showcase,
  .hero-card,
  .timeline-grid,
  .portrait-stage,
  .cards-grid {
    grid-template-columns: 1fr;
  }

  .showcase-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero-device {
    min-height: 460px;
  }
}

@media (max-width: 720px) {
  .ambient {
    display: none;
  }

  .site-shell {
    width: min(1120px, calc(100% - 24px));
    padding-top: 14px;
  }

  .site-header {
    position: static;
    top: auto;
    border-radius: 24px;
    align-items: stretch;
    flex-direction: column;
    gap: 14px;
    padding: 14px;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: none;
    box-shadow: 0 8px 24px rgba(15, 18, 26, 0.04);
  }

  .site-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 12px;
    width: 100%;
  }

  .site-nav a {
    display: block;
    padding: 10px 12px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #ffffff;
    text-align: center;
  }

  .button-row {
    display: grid;
    grid-template-columns: 1fr;
    width: 100%;
  }

  .showcase-grid {
    grid-template-columns: 1fr;
  }

  .device-stats {
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
    backdrop-filter: none;
  }

  h1 {
    font-size: clamp(2.3rem, 11vw, 4rem);
    line-height: 1.04;
  }

  .hero {
    gap: 24px;
    padding-top: 44px;
  }

  .hero-premium {
    min-height: auto;
  }

  .hero-device {
    min-height: 380px;
    padding: 12px;
  }

  .device-screen {
    padding: 22px;
  }

  .content-card,
  .feature-panel,
  .mini-card,
  .photo-card {
    padding: 18px;
    backdrop-filter: none;
    box-shadow: 0 8px 24px rgba(15, 18, 26, 0.04);
  }

  .portrait-shell {
    padding: 18px;
  }

  .portrait-backdrop {
    inset: 8% 6%;
    border-radius: 28px;
  }

  .hero-device,
  .summary-card,
  .device-stats div,
  .device-frame {
    box-shadow: 0 8px 24px rgba(15, 18, 26, 0.04);
  }

  .device-glow,
  .portrait-backdrop {
    opacity: 0.55;
  }
}

@media (max-width: 720px), (prefers-reduced-motion: reduce) {
  .reveal {
    --parallax-offset: 0px;
  }
}

@media (max-width: 420px) {
  .site-shell {
    width: calc(100% - 16px);
  }

  .site-header {
    border-radius: 20px;
    padding: 12px;
  }

  .site-nav {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 28px;
  }

  .hero-device {
    min-height: 340px;
  }

  .device-screen {
    padding: 18px;
  }

  .summary-card,
  .content-card,
  .feature-panel,
  .mini-card,
  .photo-card {
    border-radius: 22px;
  }
}