:root {
  --bg: #07080c;
  --bg-2: #10131a;
  --text: #f4f4f5;
  --muted: #9aa3b5;
  --line: rgba(148, 163, 184, 0.16);
  --accent: #1d4ed8;
  --accent-ink: #eff6ff;
  --accent-deep: #1e3a8a;
  --accent-soft: rgba(29, 78, 216, 0.14);
  --font-display: "Syne", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --max: 1120px;
  --header-h: 68px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --dur: 0.7s;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

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

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  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;
  left: 1rem;
  top: -100%;
  z-index: 100;
  padding: 0.65rem 1rem;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 500;
}

.skip-link:focus {
  top: 1rem;
}

/* Ambient atmosphere */
.ambient {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.ambient__glow {
  position: absolute;
  width: 48vw;
  height: 48vw;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.45;
  will-change: transform;
  transform: translate3d(0, var(--parallax-y, 0px), 0);
}

.ambient__glow--a {
  top: -12%;
  right: -8%;
  background: radial-gradient(circle, rgba(29, 78, 216, 0.35), transparent 68%);
}

.ambient__glow--b {
  bottom: 8%;
  left: -14%;
  width: 42vw;
  height: 42vw;
  background: radial-gradient(circle, rgba(30, 58, 138, 0.28), transparent 70%);
}

.ambient__grain {
  position: absolute;
  inset: 0;
  opacity: 0.035;
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(255, 255, 255, 0.03) 2px,
      rgba(255, 255, 255, 0.03) 3px
    );
  mix-blend-mode: overlay;
}

/* Scroll progress */
.scroll-progress {
  position: fixed;
  inset: 0 0 auto;
  height: 2px;
  z-index: 60;
  background: rgba(255, 255, 255, 0.04);
  pointer-events: none;
}

.scroll-progress__bar {
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent-deep), var(--accent));
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  padding: 0 clamp(1.25rem, 4vw, 2.75rem);
  background: rgba(7, 8, 12, 0.72);
  border-bottom: 1px solid transparent;
  transform: translateY(-12px);
  opacity: 0;
  transition:
    transform 0.55s var(--ease-out),
    opacity 0.55s var(--ease-out),
    border-color 0.3s ease,
    background-color 0.3s ease;
}

body.is-ready .site-header {
  transform: none;
  opacity: 1;
  transition-delay: 0.08s;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(7, 8, 12, 0.92);
}

.site-header.is-hidden {
  transform: translateY(-100%);
}

.logo {
  position: relative;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.03em;
  cursor: pointer;
}

.logo::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 100%;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease-out);
}

.logo:hover::after,
.logo:focus-visible::after {
  transform: scaleX(1);
}

.site-nav {
  display: flex;
  gap: 1.75rem;
}

.site-nav a {
  position: relative;
  overflow: hidden;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.25s ease;
}

.site-nav a span {
  display: inline-block;
  transition: transform 0.35s var(--ease-out);
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.35rem;
  width: 100%;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease-out);
}

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

.site-nav a:hover span,
.site-nav a:focus-visible span {
  transform: translateY(-1px);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after,
.site-nav a.is-active::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin-inline: auto;
  background: var(--text);
  transition: transform 0.28s var(--ease-out), opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(4px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-4px) rotate(-45deg);
}

/* Hero */
/* Hero */
.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  align-items: end;
  gap: clamp(2rem, 6vw, 4.5rem);
  max-width: var(--max);
  margin: 0 auto;
  min-height: calc(100svh - var(--header-h));
  padding: clamp(2.5rem, 7vw, 5.5rem) clamp(1.25rem, 4vw, 2.75rem) clamp(4rem, 9vw, 6rem);
}

.hero-copy {
  will-change: transform;
  transform: translate3d(0, var(--parallax-y, 0px), 0);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3.6rem, 11vw, 6.6rem);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.055em;
  margin-bottom: 1.5rem;
  overflow: hidden;
  min-height: 0.95em;
}

.hero-title .char {
  display: inline-block;
  opacity: 0;
  transform: translateY(110%) rotate(6deg);
  filter: blur(6px);
  will-change: transform, opacity, filter;
}

.hero-title.is-ready .char {
  animation: char-in 0.85s var(--ease-out) forwards;
  animation-delay: calc(var(--i) * 0.04s + 0.15s);
}

.hero-lead {
  max-width: 30rem;
  color: var(--muted);
  margin-bottom: 2.1rem;
}

.hero-lead .line {
  display: block;
  overflow: hidden;
}

.hero-lead .line span {
  display: block;
  opacity: 0;
  transform: translateY(100%);
  transition:
    opacity 0.65s var(--ease-out),
    transform 0.65s var(--ease-out);
  transition-delay: calc(0.35s + var(--li, 0) * 0.1s);
}

.hero-lead.is-in .line span {
  opacity: 1;
  transform: none;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.hero-figure {
  justify-self: end;
  width: min(340px, 74vw);
  overflow: hidden;
  background: transparent;
  will-change: transform;
}

.hero-figure[data-reveal="clip"] {
  opacity: 0;
  transform: translate3d(28px, var(--parallax-y, 0px), 0) scale(0.97);
  filter: blur(8px);
  transition:
    opacity 0.8s var(--ease-out),
    transform 0.9s var(--ease-out),
    filter 0.8s var(--ease-out);
  transition-delay: 0.2s;
}

.hero-figure[data-reveal="clip"].is-in {
  opacity: 1;
  transform: translate3d(0, var(--parallax-y, 0px), 0);
  filter: none;
  overflow: visible;
}

.model-stage {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  touch-action: none;
  cursor: grab;
  background:
    radial-gradient(circle at 50% 62%, rgba(29, 78, 216, 0.18), transparent 60%),
    linear-gradient(160deg, #121722 0%, var(--bg-2) 100%);
  transition: transform 0.45s var(--ease-out);
}

.model-stage:hover {
  transform: translateY(-4px);
}

.model-stage:active {
  cursor: grabbing;
}

.model-canvas {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.5s var(--ease-out);
}

.model-stage.is-ready .model-canvas {
  opacity: 1;
}

.model-fallback {
  display: block;
  position: relative;
  z-index: 0;
  width: 100%;
  height: 100%;
}

.model-fallback[hidden] {
  display: none;
}

.model-status {
  position: absolute;
  left: 0.75rem;
  bottom: 0.75rem;
  z-index: 2;
  margin: 0;
  font-size: 0.75rem;
  color: var(--muted);
  pointer-events: none;
}

.model-stage.is-ready .model-status,
.model-stage.is-fallback .model-status {
  display: none;
}

.avatar {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  filter: contrast(1.04) saturate(0.92);
}

/* Buttons */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: 46px;
  padding: 0.75rem 1.3rem;
  overflow: hidden;
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  border: 1px solid transparent;
  cursor: pointer;
  isolation: isolate;
  transition:
    color 0.28s ease,
    border-color 0.28s ease,
    transform 0.35s var(--ease-out);
  will-change: transform;
}

.btn__label,
.btn__arrow,
.icon {
  position: relative;
  z-index: 1;
  transition: transform 0.35s var(--ease-out);
}

.btn__arrow {
  display: inline-block;
  transform: translateX(0);
}

.btn:hover .btn__arrow,
.btn:focus-visible .btn__arrow {
  transform: translateX(4px);
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  transform: translateY(101%);
  transition: transform 0.4s var(--ease-out);
}

.btn:hover::before,
.btn:focus-visible::before {
  transform: none;
}

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

.btn-primary::before {
  background: var(--accent-deep);
}

.btn-line {
  border-color: var(--line);
  color: var(--text);
  background: rgba(255, 255, 255, 0.02);
}

.btn-line::before {
  background: var(--accent);
}

.btn-line:hover,
.btn-line:focus-visible {
  border-color: var(--accent);
  color: var(--accent-ink);
}

.icon {
  flex-shrink: 0;
}

/* Sections */
.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(4rem, 10vw, 7rem) clamp(1.25rem, 4vw, 2.75rem);
}

.section-head {
  display: grid;
  gap: 1rem;
  margin-bottom: 2.4rem;
}

.section-head__text h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.7rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.05;
}

.section-head__text p {
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.section-head__rule {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--line);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.9s var(--ease-out);
  transition-delay: 0.12s;
}

.section-head.is-in .section-head__rule {
  transform: scaleX(1);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.75rem 2.75rem;
  color: var(--muted);
  max-width: 52rem;
}

.about-grid p {
  position: relative;
  padding-left: 1rem;
}

.about-grid p::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35em;
  width: 2px;
  height: 0;
  background: var(--accent);
  transition: height 0.55s var(--ease-out);
  transition-delay: 0.15s;
}

.about-grid p.is-in::before {
  height: 1.5em;
}

.contact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.site-footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.75rem clamp(1.25rem, 4vw, 2.75rem) 2.85rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
}

.site-footer__credit {
  font-size: 0.82rem;
  letter-spacing: 0.01em;
  color: #6b7280;
  transition: color 0.25s ease;
}

.site-footer__credit:hover {
  color: var(--muted);
}

/* Reveal system */
[data-reveal]:not([data-reveal="clip"]):not(.hero-lead) {
  opacity: 0;
  transform: translateY(28px);
  filter: blur(4px);
  transition:
    opacity var(--dur) var(--ease-out),
    transform var(--dur) var(--ease-out),
    filter var(--dur) var(--ease-out);
}

[data-reveal].is-in:not([data-reveal="clip"]):not(.hero-lead) {
  opacity: 1;
  transform: none;
  filter: none;
}

.hero-actions[data-reveal] {
  transition-delay: 0.48s;
}

[data-stagger] > [data-reveal]:nth-child(1) { transition-delay: 0.05s; }
[data-stagger] > [data-reveal]:nth-child(2) { transition-delay: 0.16s; }
[data-stagger] > [data-reveal]:nth-child(3) { transition-delay: 0.27s; }

@keyframes char-in {
  to {
    opacity: 1;
    transform: none;
    filter: blur(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  body,
  .scroll-progress__bar,
  .site-header,
  .logo::after,
  .site-nav a::after,
  .site-nav a span,
  .nav-toggle span,
  .btn,
  .btn::before,
  .btn__arrow,
  .model-stage,
  .section-head__rule,
  .about-grid p::before,
  [data-reveal],
  .hero-figure[data-reveal="clip"],
  .hero-lead .line span,
  .ambient__glow {
    transition: none !important;
    animation: none !important;
    filter: none !important;
  }

  .site-header,
  .hero-title .char,
  [data-reveal],
  .hero-figure[data-reveal="clip"],
  .hero-lead .line span {
    opacity: 1 !important;
    transform: none !important;
  }

  .site-header.is-hidden {
    transform: none;
  }
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    align-items: start;
    padding-top: 2.5rem;
    padding-bottom: 4.5rem;
  }

  .hero-figure {
    justify-self: start;
    order: -1;
  }

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

@media (max-width: 640px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 0.35rem 1.25rem 1rem;
    background: rgba(7, 8, 12, 0.98);
    border-bottom: 1px solid var(--line);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s var(--ease-out);
  }

  .site-nav.is-open {
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }

  .site-nav a {
    padding: 0.95rem 0;
    border-bottom: 1px solid var(--line);
  }

  .site-nav a:last-child {
    border-bottom: 0;
  }

  .site-nav a::after {
    display: none;
  }

  .ambient__glow {
    opacity: 0.28;
    filter: blur(60px);
  }
}