/* ============================================================
   SUNYL — Personal Homepage
   Design system: dark space-tech · glassmorphism · 3D ambient
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  /* palette */
  --bg: #05060a;
  --bg-soft: #0a0c15;
  --surface: rgba(255, 255, 255, 0.03);
  --surface-strong: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);

  --text: #eef0f8;
  --text-muted: #a7adc4;
  --text-dim: #7d85a0;

  --primary: #7b61ff;
  --primary-2: #6c63ff;
  --accent: #4fd8d8;
  --accent-2: #22d3ee;
  --glow-purple: rgba(123, 97, 255, 0.5);
  --glow-cyan: rgba(79, 216, 216, 0.45);

  /* radius */
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 22px;
  --r-xl: 30px;

  /* spacing (8pt grid) */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-6: 24px;
  --s-8: 32px;
  --s-10: 40px;
  --s-12: 48px;
  --s-16: 64px;
  --s-24: 96px;

  /* type */
  --font-display: "Space Grotesk", "Inter", "Noto Sans SC", sans-serif;
  --font-body: "Inter", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, monospace;

  --type-display: clamp(64px, 14vw, 180px);
  --type-hero-tag: clamp(22px, 3.4vw, 40px);
  --type-section: clamp(32px, 5vw, 56px);

  /* motion */
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-standard: cubic-bezier(0.2, 0, 0, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  --nav-h: 72px;
}

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

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

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  cursor: none;
}

@media (pointer: coarse) {
  body {
    cursor: auto;
  }
}

::selection {
  background: var(--primary);
  color: #fff;
}

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

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

/* 键盘焦点：所有可交互元素有清晰可见的 focus 状态 */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--primary), var(--accent));
  border-radius: 8px;
  border: 2px solid var(--bg);
}

/* ---------- 3D background layers ---------- */
/* 静态深色渐变：无 WebGL（移动端 / 详情页）时作为背景，WebGL 开启时被画布覆盖 */
#webgl-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(110% 90% at 50% 0%, rgba(79, 216, 216, 0.05), transparent 45%),
    radial-gradient(120% 90% at 20% 100%, rgba(123, 97, 255, 0.09), transparent 55%),
    radial-gradient(120% 90% at 85% 85%, rgba(34, 211, 238, 0.04), transparent 50%),
    #05060a;
}

.scrim {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    rgba(5, 6, 10, 0.28) 0%,
    rgba(5, 6, 10, 0.72) 55%,
    rgba(5, 6, 10, 0.9) 100%
  );
}

.grain {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  opacity: 0.04;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- Preloader ---------- */
#preloader {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  place-items: center;
  background: var(--bg);
  transition: opacity 0.8s var(--ease-out), visibility 0.8s var(--ease-out);
}
body.is-loaded #preloader {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.preloader__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}
.preloader__mark {
  position: relative;
  width: 88px;
  height: 88px;
  display: grid;
  place-items: center;
}
.preloader__ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid transparent;
  border-top-color: var(--primary);
  border-right-color: var(--accent);
  animation: spin 1s linear infinite;
  filter: drop-shadow(0 0 10px var(--glow-purple));
}
.preloader__letter {
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.preloader__word {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.5em;
  color: var(--text-dim);
}
.preloader__bar {
  width: 160px;
  height: 2px;
  background: var(--surface-strong);
  border-radius: 2px;
  overflow: hidden;
}
.preloader__bar span {
  display: block;
  height: 100%;
  width: 40%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  animation: preload 1.2s var(--ease-standard) infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}
@keyframes preload {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(400%);
  }
}

/* ---------- Scroll progress ---------- */
#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  z-index: 101;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  box-shadow: 0 0 12px var(--glow-purple);
}

/* ---------- Custom cursor ---------- */
.cursor,
.cursor-ring {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  pointer-events: none;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  will-change: transform;
}
.cursor {
  width: 8px;
  height: 8px;
  background: var(--accent);
  box-shadow: 0 0 12px var(--glow-cyan);
}
.cursor-ring {
  width: 36px;
  height: 36px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  transition: width 0.25s var(--ease-standard), height 0.25s var(--ease-standard),
    border-color 0.25s var(--ease-standard), background 0.25s var(--ease-standard);
}
.cursor-ring.is-hover {
  width: 56px;
  height: 56px;
  border-color: var(--accent);
  background: rgba(79, 216, 216, 0.08);
}
@media (pointer: coarse) {
  .cursor,
  .cursor-ring {
    display: none;
  }
}

/* ---------- Layout ---------- */
main {
  position: relative;
  z-index: 3;
}

.section {
  max-width: 1160px;
  margin: 0 auto;
  padding: var(--s-24) var(--s-6);
  scroll-margin-top: var(--nav-h);
}

/* ---------- Nav ---------- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  transition: background 0.35s var(--ease-standard), border-color 0.35s var(--ease-standard),
    backdrop-filter 0.35s var(--ease-standard);
  border-bottom: 1px solid transparent;
}
.site-nav.is-scrolled {
  background: rgba(5, 6, 10, 0.65);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom-color: var(--border);
}
.nav__inner {
  max-width: 1160px;
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--s-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-6);
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--s-3);
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.06em;
}
.brand__mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 9px;
  overflow: hidden;
  background: #0a0c15;
  border: 1px solid var(--border-strong);
}
.brand__mark-letter {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.brand__mark-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 3px;
  background: #0a0c15;
}
.brand__word {
  font-size: 16px;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--s-8);
}
.nav__link {
  position: relative;
  font-size: 14px;
  color: var(--text-muted);
  transition: color 0.2s var(--ease-standard);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease-standard);
}
.nav__link:hover {
  color: var(--text);
}
.nav__link:hover::after {
  transform: scaleX(1);
}
.nav__link.is-active {
  color: var(--text);
}
.nav__link.is-active::after {
  transform: scaleX(1);
}

.nav__cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--surface);
  transition: border-color 0.2s var(--ease-standard), background 0.2s var(--ease-standard);
}
.nav__cta:hover {
  border-color: var(--primary);
  background: rgba(123, 97, 255, 0.1);
}
.nav__cta-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--glow-cyan);
  animation: pulse 2s infinite;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 8px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 10px;
  touch-action: manipulation;
}
.nav__toggle span {
  display: block;
  height: 2px;
  width: 100%;
  border-radius: 2px;
  background: var(--text);
  transition: transform 0.3s var(--ease-standard), opacity 0.2s;
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.6);
    opacity: 0.5;
  }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--nav-h) + var(--s-8)) var(--s-6) var(--s-16);
  text-align: center;
}
.hero__inner {
  max-width: 900px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.42em;
  color: var(--text-dim);
  margin-bottom: var(--s-6);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--type-display);
  font-weight: 700;
  line-height: 0.92;
  letter-spacing: 0.02em;
  background: linear-gradient(180deg, #ffffff 0%, #cfd3ea 42%, #7b8bff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero__tagline {
  margin-top: var(--s-8);
  font-size: var(--type-hero-tag);
  font-weight: 500;
  line-height: 1.3;
  color: var(--text);
  text-shadow: 0 2px 26px rgba(5, 6, 10, 0.75);
}
.hero__tagline .accent {
  color: var(--accent);
  text-shadow: 0 0 24px var(--glow-cyan);
}

.hero__sub {
  margin-top: var(--s-6);
  max-width: 560px;
  font-size: 16px;
  color: var(--text-muted);
  text-shadow: 0 2px 26px rgba(5, 6, 10, 0.75);
}

.hero__cta {
  display: flex;
  gap: var(--s-4);
  margin-top: var(--s-10);
  flex-wrap: wrap;
  justify-content: center;
}

.hero__caps {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0;
  margin-top: var(--s-10);
  list-style: none;
}
.hero__cap {
  display: flex;
  align-items: center;
}
.hero__cap:not(:last-child)::after {
  content: "";
  width: 1px;
  height: 14px;
  margin: 0 clamp(14px, 3vw, 26px);
  background: var(--border-strong);
}
.hero__cap-label {
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.hero__scroll {
  position: absolute;
  bottom: var(--s-8);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.hero__scroll-text {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.4em;
  color: var(--text-dim);
}
.hero__scroll-line {
  position: relative;
  width: 1px;
  height: 48px;
  background: var(--border-strong);
  overflow: hidden;
}
.hero__scroll-line::after {
  content: "";
  position: absolute;
  left: 0;
  top: -50%;
  width: 100%;
  height: 50%;
  background: linear-gradient(var(--accent), transparent);
  animation: scrollLine 2.2s var(--ease-standard) infinite;
}
@keyframes scrollLine {
  0% {
    top: -50%;
  }
  100% {
    top: 110%;
  }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 26px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: transform 0.15s var(--ease-standard), box-shadow 0.2s var(--ease-standard),
    background 0.2s var(--ease-standard), border-color 0.2s var(--ease-standard);
}
.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), #5b4bd6);
  box-shadow: 0 8px 30px rgba(123, 97, 255, 0.4);
}
.btn--primary:hover {
  box-shadow: 0 12px 40px rgba(123, 97, 255, 0.6);
  transform: translateY(-2px);
}

.btn--ghost {
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
}
.btn--ghost:hover {
  border-color: var(--accent);
  background: rgba(79, 216, 216, 0.08);
}

/* ---------- Section head ---------- */
.section__head {
  margin-bottom: var(--s-16);
}
.section__eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.32em;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.section__eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--accent);
  box-shadow: 0 0 8px var(--glow-cyan);
}
.section__title {
  margin-top: var(--s-4);
  font-family: var(--font-display);
  font-size: var(--type-section);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.05;
}
.section__sub {
  margin-top: var(--s-4);
  color: var(--text-muted);
  font-size: 16px;
}

/* ---------- About ---------- */
.about__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(40px, 6vw, 80px);
  align-items: start;
}
.about__text p {
  color: var(--text-muted);
  font-size: 17px;
  line-height: 1.85;
}
.about__text p + p {
  margin-top: var(--s-5);
}
.about__lead {
  color: var(--text) !important;
  font-size: 22px !important;
  font-weight: 500;
  line-height: 1.5 !important;
}
.about__lead strong {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.about__text em {
  font-style: normal;
  color: var(--accent);
}
.about__sign {
  margin-top: var(--s-6);
  padding-left: var(--s-4);
  border-left: 2px solid var(--accent);
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text) !important;
}

.about__chips {
  padding: var(--s-8);
  border-radius: var(--r-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.about__chips-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--text-dim);
  margin-bottom: var(--s-5);
}
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.chip {
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--surface-strong);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: color 0.2s var(--ease-standard), border-color 0.2s var(--ease-standard),
    background 0.2s var(--ease-standard), transform 0.2s var(--ease-spring);
}
.chip:hover {
  color: var(--text);
  border-color: var(--primary);
  background: rgba(123, 97, 255, 0.12);
  transform: translateY(-2px);
}

/* ---------- Projects ---------- */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-6);
}
.card {
  display: block;
  position: relative;
  border-radius: var(--r-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  overflow: hidden;
  transform-style: preserve-3d;
  transition: border-color 0.3s var(--ease-standard), box-shadow 0.3s var(--ease-standard);
  will-change: transform;
}
.card:hover {
  border-color: var(--border-strong);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(123, 97, 255, 0.12);
}
.card__cover {
  position: relative;
  height: 200px;
  display: flex;
  align-items: flex-end;
  padding: var(--s-4);
  overflow: hidden;
  background: radial-gradient(120% 140% at 30% 20%, #16162a 0%, #0a0c15 100%);
}
.card__cover img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ease-out);
}
.card__cover.cover--contain img {
  object-fit: contain;
  padding: 26px;
}
.card:hover .card__cover img {
  transform: scale(1.05);
}
.card__cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 42%, rgba(5, 6, 10, 0.6) 100%);
}
.card__cover.cover--sys {
  background:
    radial-gradient(120% 160% at 85% 0%, rgba(123, 97, 255, 0.35), transparent 60%),
    radial-gradient(120% 160% at 15% 100%, rgba(79, 216, 216, 0.25), transparent 60%),
    #0a0c15;
}
.card__cover.cover--sys::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 22px 22px;
}
.card__index {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.85);
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(8px);
}

/* 重点案例卡片 */
.card--featured {
  grid-column: span 2;
}
.card--featured .card__cover {
  height: 260px;
}
.card__flag {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 1;
  padding: 5px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: rgba(79, 216, 216, 0.1);
  border: 1px solid rgba(79, 216, 216, 0.35);
  border-radius: 999px;
}

/* cover artwork: images via .card__cover img; no-image system card via .cover--sys */

.card__body {
  padding: var(--s-6);
}
.card__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.card__desc {
  margin-top: var(--s-2);
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}
.card__proof {
  display: flex;
  align-items: baseline;
  gap: 9px;
  margin-top: var(--s-4);
  padding-top: var(--s-4);
  border-top: 1px solid var(--border);
  font-size: 13px;
  line-height: 1.55;
}
.card__proof-label {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--accent);
  text-transform: uppercase;
}
.card__proof-value {
  color: var(--text-muted);
}
.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: var(--s-4);
}
.card__tag {
  padding: 4px 11px;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 999px;
}

/* ---------- Approach ---------- */
.approach__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-6);
}
.approach__step {
  position: relative;
  padding: var(--s-8);
  border-radius: var(--r-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: border-color 0.3s var(--ease-standard), background 0.3s var(--ease-standard),
    transform 0.3s var(--ease-spring);
}
.approach__step:hover {
  border-color: var(--border-strong);
  background: var(--surface-strong);
  transform: translateY(-4px);
}
.approach__num {
  font-family: var(--font-display);
  font-size: 64px;
  font-weight: 700;
  line-height: 1;
  background: linear-gradient(135deg, rgba(123, 97, 255, 0.4), rgba(79, 216, 216, 0.25));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.approach__title {
  margin-top: var(--s-5);
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
}
.approach__desc {
  margin-top: var(--s-3);
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.7;
}

/* ---------- Contact ---------- */
.contact__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--s-4);
}
.contact__item {
  display: flex;
  align-items: center;
  gap: var(--s-5);
  padding: var(--s-6);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-strong);
  transition: border-color 0.25s var(--ease-standard), background 0.25s var(--ease-standard),
    transform 0.25s var(--ease-spring);
  /* 兼容 button 形态（微信复制卡） */
  font: inherit;
  color: inherit;
  text-align: left;
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
}
.contact__item:hover {
  border-color: var(--primary);
  background: rgba(123, 97, 255, 0.1);
  transform: translateY(-3px);
}
.contact__icon {
  display: grid;
  place-items: center;
  flex: none;
  width: 48px;
  height: 48px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  border-radius: 12px;
  color: var(--accent);
  background: rgba(79, 216, 216, 0.1);
  border: 1px solid rgba(79, 216, 216, 0.35);
}
.contact__icon svg {
  width: 22px;
  height: 22px;
}
.contact__item[data-copy] .contact__arrow {
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}
.contact__meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.contact__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--text-muted);
}
.contact__value {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.contact__arrow {
  margin-left: auto;
  font-size: 20px;
  color: var(--text-muted);
  transition: color 0.2s var(--ease-standard), transform 0.25s var(--ease-spring);
}
.contact__item:hover .contact__arrow {
  color: var(--accent);
  transform: translate(3px, -3px);
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  z-index: 3;
  max-width: 1160px;
  margin: var(--s-16) auto 0;
  padding: var(--s-10) var(--s-6) var(--s-10);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-6);
  flex-wrap: wrap;
}
.footer__brand {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.05em;
}
.footer__dot {
  color: var(--accent);
}
.footer__note {
  font-size: 13px;
  color: var(--text-dim);
}
.footer__top {
  font-size: 13px;
  color: var(--text-muted);
  transition: color 0.2s var(--ease-standard);
}
.footer__top:hover {
  color: var(--accent);
}

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
  transition-delay: calc(var(--delay, 0) * 90ms);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .about__grid {
    grid-template-columns: 1fr;
  }
  .projects__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .card--featured {
    grid-column: span 1;
  }
  .card--featured .card__cover {
    height: 200px;
  }
  .contact__grid {
    grid-template-columns: 1fr;
  }
  .approach__grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .nav__links,
  .nav__cta {
    display: none;
  }
  .nav__toggle {
    display: flex;
  }
  .projects__grid {
    grid-template-columns: 1fr;
  }
  .hero__caps {
    margin-top: var(--s-8);
  }
  .hero__inner {
    width: 100%;
    max-width: 360px;
  }
  .hero__eyebrow {
    max-width: 100%;
    font-size: 10px;
    letter-spacing: 0.22em;
    white-space: nowrap;
  }
  .hero__tagline {
    max-width: 100%;
    font-size: clamp(21px, 6.2vw, 27px);
  }
  .hero__tagline .accent {
    white-space: nowrap;
  }
  .hero__cap:not(:last-child)::after {
    margin: 0 12px;
  }
  .site-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Mobile menu open state（更实的深色背景） */
.site-nav.menu-open {
  background: #07080e;
}
.site-nav.menu-open .nav__links {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: var(--nav-h);
  left: 0;
  right: 0;
  gap: 0;
  padding: var(--s-4) var(--s-6) var(--s-6);
  background: #07080e;
  border-bottom: 1px solid var(--border);
}
body.menu-open {
  overflow: hidden;
}
.site-nav.menu-open .nav__link {
  display: block;
  padding: var(--s-4) 0;
  font-size: 18px;
  border-bottom: 1px solid var(--border);
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .cursor,
  .cursor-ring {
    display: none;
  }
  body {
    cursor: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* ---------- Card "view detail" ---------- */
.card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.card__more {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: var(--s-4);
  font-size: 13px;
  color: var(--text-dim);
  transition: color 0.25s var(--ease-standard);
}
.card__more span {
  display: inline-block;
  transition: transform 0.25s var(--ease-spring);
}
.card:hover .card__more {
  color: var(--accent);
}
.card:hover .card__more span {
  transform: translate(2px, -2px);
}

/* ---------- Project modal ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--s-6);
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.35s var(--ease-standard), visibility 0.35s var(--ease-standard);
}
.modal.is-open {
  visibility: visible;
  opacity: 1;
}
.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(3, 4, 8, 0.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.modal__panel {
  position: relative;
  width: min(760px, 100%);
  max-height: min(88vh, 860px);
  display: flex;
  flex-direction: column;
  border-radius: var(--r-xl);
  background: #0b0d17;
  border: 1px solid var(--border-strong);
  box-shadow: 0 40px 120px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(123, 97, 255, 0.08);
  overflow: hidden;
  transform: translateY(16px) scale(0.98);
  transition: transform 0.35s var(--ease-out);
}
.modal.is-open .modal__panel {
  transform: none;
}
.modal__close {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 3;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  font-size: 24px;
  line-height: 1;
  color: var(--text);
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: background 0.2s var(--ease-standard), border-color 0.2s var(--ease-standard),
    transform 0.3s var(--ease-spring);
}
.modal__close:hover {
  background: rgba(123, 97, 255, 0.2);
  border-color: var(--primary);
  transform: rotate(90deg);
}
.modal__scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
}
.modal__cover {
  position: relative;
  height: 260px;
  background: radial-gradient(120% 140% at 30% 20%, #16162a 0%, #0a0c15 100%);
  overflow: hidden;
}
.modal__cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 30%, rgba(11, 13, 23, 0.9) 100%);
}
.modal__cover-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.modal__cover-img--contain {
  object-fit: contain;
  padding: 28px;
}
.modal__cover-fallback {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background:
    radial-gradient(120% 160% at 85% 0%, rgba(123, 97, 255, 0.4), transparent 60%),
    radial-gradient(120% 160% at 15% 100%, rgba(79, 216, 216, 0.28), transparent 60%),
    #0a0c15;
}
.modal__cover-fallback::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 24px 24px;
}
.modal__cover-fallback span {
  position: relative;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.4em;
  color: rgba(255, 255, 255, 0.5);
}
.modal__content {
  padding: var(--s-8) var(--s-8) var(--s-10);
}
.modal__category {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--accent);
}
.modal__title {
  margin-top: var(--s-3);
  font-family: var(--font-display);
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.15;
}
.modal__role {
  margin-top: var(--s-3);
  font-size: 14px;
  color: var(--text-dim);
}
.modal__body {
  margin-top: var(--s-6);
}
.modal__body p {
  color: var(--text-muted);
  font-size: 15.5px;
  line-height: 1.8;
}
.modal__body p + p {
  margin-top: var(--s-4);
}
.modal__subhead {
  margin-top: var(--s-8);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--text-dim);
}
.modal__highlights {
  margin-top: var(--s-4);
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
}
.modal__highlights li {
  position: relative;
  padding-left: 22px;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.6;
}
.modal__highlights li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  transform: rotate(45deg);
}
.modal__stack {
  margin-top: var(--s-4);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

body.modal-open {
  overflow: hidden;
}

@media (max-width: 640px) {
  .modal__cover {
    height: 200px;
  }
  .modal__content {
    padding: var(--s-6) var(--s-5) var(--s-8);
  }
}

/* ---------- Project detail page ---------- */
.detail {
  position: relative;
  z-index: 3;
  max-width: 860px;
  margin: 0 auto;
  padding: calc(var(--nav-h) + var(--s-10)) var(--s-6) var(--s-16);
}
.detail__wrap {
  display: flex;
  flex-direction: column;
  gap: var(--s-8);
}
.detail__back {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  font-size: 14px;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  transition: color 0.2s var(--ease-standard), border-color 0.2s var(--ease-standard),
    background 0.2s var(--ease-standard);
}
.detail__back:hover {
  color: var(--text);
  border-color: var(--accent);
  background: rgba(79, 216, 216, 0.08);
}
.detail__cover {
  position: relative;
  height: clamp(280px, 42vh, 480px);
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: radial-gradient(120% 140% at 30% 20%, #16162a 0%, #0a0c15 100%);
}
.detail__cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 30%, rgba(11, 13, 23, 0.85) 100%);
  pointer-events: none;
}
.detail__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.detail__cover img.detail__cover--contain {
  object-fit: contain;
  padding: 40px;
}
.detail__cover--fallback {
  background:
    radial-gradient(120% 160% at 85% 0%, rgba(123, 97, 255, 0.4), transparent 60%),
    radial-gradient(120% 160% at 15% 100%, rgba(79, 216, 216, 0.28), transparent 60%),
    #0a0c15;
}
.detail__cover--fallback::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 24px 24px;
}
.detail__cover--fallback span {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.4em;
  color: rgba(255, 255, 255, 0.5);
}
.detail__content {
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
}
.detail__category {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--accent);
}
.detail__title {
  font-family: var(--font-display);
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.detail__role {
  font-size: 15px;
  color: var(--text-muted);
}
.detail__value {
  font-size: clamp(17px, 2vw, 19px);
  font-weight: 500;
  line-height: 1.6;
  color: var(--text);
  max-width: 62ch;
}
.detail__body {
  margin-top: var(--s-4);
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
}
.detail__body p {
  color: #c4cadf;
  font-size: 17px;
  line-height: 1.9;
  max-width: 68ch;
}
.detail__subhead {
  margin-top: var(--s-8);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--text-muted);
}
.detail__header {
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
}
.detail__section {
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
}
.detail__decisions {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
}
.detail__decisions li {
  position: relative;
  padding-left: 24px;
  color: #c4cadf;
  font-size: 15.5px;
  line-height: 1.7;
}
.detail__decisions li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  transform: rotate(45deg);
}

/* 详情页：稳定深色背景，让作品图片成为视觉中心 */
body.detail-body #webgl-bg {
  background:
    radial-gradient(120% 100% at 50% 0%, rgba(123, 97, 255, 0.07), transparent 50%),
    #07080e;
}
body.detail-body .scrim {
  background: linear-gradient(180deg, rgba(7, 8, 14, 0.55), rgba(7, 8, 14, 0.88));
}
.detail__highlights {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
}
.detail__highlights li {
  position: relative;
  padding-left: 24px;
  color: var(--text-muted);
  font-size: 15.5px;
  line-height: 1.65;
}
.detail__highlights li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  transform: rotate(45deg);
}
.detail__stack {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.detail__pager {
  margin-top: var(--s-8);
  padding-top: var(--s-6);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--s-6);
}
.pager__link {
  font-size: 14px;
  color: var(--text-muted);
  transition: color 0.2s var(--ease-standard);
}
.pager__link:hover {
  color: var(--accent);
}
.pager__link--next {
  text-align: right;
}

/* entrance */
.detail__wrap.is-in {
  animation: detailIn 0.7s var(--ease-out) both;
}
@keyframes detailIn {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* gallery (additional project images) */
.detail__gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--s-4);
}
.gallery__item {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.gallery__item img {
  width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: var(--r-md);
  border: 1px solid var(--border);
  background: #ffffff;
  transition: transform 0.3s var(--ease-out);
}
.gallery__item img:hover {
  transform: scale(1.03);
}
.gallery__item figcaption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  text-align: center;
}

/* "开发中" badge on project cards（克制） */
.card__badge {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: #cbb48a;
  background: rgba(120, 90, 30, 0.14);
  border: 1px solid rgba(180, 145, 70, 0.32);
  border-radius: 999px;
}
.card__badge-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #c9a35c;
  animation: pulse 2.4s infinite;
}

/* "仍在开发中" status note on detail page */
.detail__status {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: #ffd28a;
  border: 1px solid rgba(245, 158, 11, 0.4);
  border-radius: 999px;
  background: rgba(245, 158, 11, 0.08);
}
.detail__status[hidden] {
  display: none;
}
.detail__status::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #f5a623;
  box-shadow: 0 0 8px rgba(245, 166, 35, 0.8);
  animation: pulse 2s infinite;
}

/* 详情页图片：点击放大提示 */
.detail__cover img {
  transition: transform 0.4s var(--ease-out);
}
.detail__cover:hover img {
  transform: scale(1.02);
}
@media (pointer: coarse) {
  .detail__cover img,
  .gallery__item img {
    cursor: zoom-in;
  }
}

/* ---------- 图片灯箱 ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1100;
  display: grid;
  place-items: center;
  padding: var(--s-6);
  visibility: hidden;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s var(--ease-standard);
}
.lightbox.is-open {
  visibility: visible;
  pointer-events: auto;
  opacity: 1;
}
.lightbox__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(3, 4, 8, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.lightbox__frame {
  position: relative;
  z-index: 1;
  margin: 0;
  max-width: min(1100px, 92vw);
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.lightbox__img {
  max-width: 100%;
  max-height: 78vh;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: var(--r-md);
  box-shadow: 0 40px 120px rgba(0, 0, 0, 0.7);
  transform: scale(0.96);
  transition: transform 0.3s var(--ease-out);
}
.lightbox.is-open .lightbox__img {
  transform: none;
}
.lightbox__caption {
  font-size: 14px;
  color: var(--text-muted);
}
.lightbox__close {
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 2;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  font-size: 26px;
  line-height: 1;
  color: var(--text);
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: background 0.2s var(--ease-standard), border-color 0.2s var(--ease-standard),
    transform 0.3s var(--ease-spring);
}
.lightbox__close:hover {
  background: rgba(123, 97, 255, 0.2);
  border-color: var(--primary);
  transform: rotate(90deg);
}