/* ============================================================
   LULU AI STUDIO — Portfolio
   Design tokens first, then layout primitives, then components.
   Edit the tokens below to re-skin the whole site.
   ============================================================ */

:root {
  --bg: #000000;
  --bg-soft: #08080a;
  --panel: #101013;
  --panel-2: #16161a;
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.18);
  --line-soft: rgba(255, 255, 255, 0.06);
  --text: #f5f5f7;
  --muted: #a1a1a9;
  --dim: #75757d;
  --white: #ffffff;
  --silver: linear-gradient(100deg, #ffffff 0%, #cfcfd6 38%, #8d8d95 68%, #f0f0f4 100%);
  --glow-cool: rgba(122, 152, 255, 0.2);
  --glow-warm: rgba(255, 92, 128, 0.14);
  --maxw: 1220px;
  --radius: 20px;
  --radius-sm: 12px;
  --nav-h: 68px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --font: "SF Pro Display", -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 24px);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body.modal-open { overflow: hidden; }

img, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
a { -webkit-tap-highlight-color: transparent; }
button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
::selection { background: rgba(255, 255, 255, 0.9); color: #000; }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 48px);
}

/* ---------- typography ---------- */

.eyebrow {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 20px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--dim);
}

/* 章节标签前的一道短线，替代从头到脚一模一样的标题块 */
.eyebrow::before {
  content: "";
  flex: none;
  width: 28px;
  height: 1px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.52), rgba(255, 255, 255, 0.06));
}

.display {
  margin: 0;
  font-size: clamp(2.5rem, 6.4vw, 5rem);
  font-weight: 600;
  line-height: 1.04;
  letter-spacing: -0.035em;
}

.display--silver {
  background: var(--silver);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3.65vw, 2.95rem);
  font-weight: 600;
  line-height: 1.14;
  letter-spacing: -0.032em;
  text-wrap: balance;
}

.h3 {
  margin: 0;
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.lede {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(0.95rem, 1.35vw, 1.1rem);
  line-height: 1.78;
  color: var(--muted);
  text-wrap: pretty;
}

.meta-text {
  margin: 0;
  font-size: 0.8125rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dim);
}

.section {
  padding: clamp(88px, 11vw, 170px) 0;
  position: relative;
  /* 装饰性光晕故意超出画布（如 right:-120px）。若不在容器上裁掉，
     移动端浏览器会把「内容宽度」当成布局视口，整页被放大到超出屏幕，
     出现横向被裁切、导航按钮点不到的变形。overflow:clip 不产生滚动容器，
     比 hidden 更安全，老浏览器回退到 hidden。 */
  overflow: hidden;
  overflow: clip;
}

/* 段落之间用一层从上往下淡出的光，取代原来硬邦邦的色块切换 */
.section--soft {
  background: radial-gradient(130% 72% at 50% 0%, rgba(255, 255, 255, 0.036) 0%,
    rgba(255, 255, 255, 0.012) 42%, rgba(0, 0, 0, 0) 100%);
}

/* 内容页（作品 / 关于 / 联系）的首屏：给固定导航让出位置。
   单列成 class 而不是写在 style 里，横屏等矮视口才能把它收窄。 */
.section--top {
  padding-top: calc(var(--nav-h) + clamp(64px, 9vw, 120px));
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: clamp(36px, 5vw, 66px);
  padding-top: clamp(20px, 2.6vw, 32px);
  border-top: 1px solid var(--line-soft);
}

.section-head .lede { margin-top: 16px; }

.rule {
  height: 1px;
  background: var(--line);
  border: 0;
  margin: 0;
}

/* ---------- ambient glow (used sparingly) ---------- */

.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(130px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.72;
}

.glow--cool { background: var(--glow-cool); }
.glow--warm { background: var(--glow-warm); }

/* ---------- nav ---------- */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 90;
  height: var(--nav-h);
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: saturate(180%) blur(24px);
  -webkit-backdrop-filter: saturate(180%) blur(24px);
  border-bottom: 1px solid transparent;
  transition: background 0.4s var(--ease), border-color 0.4s var(--ease);
}

.nav.is-scrolled {
  background: rgba(0, 0, 0, 0.72);
  border-bottom-color: var(--line);
  box-shadow: 0 22px 46px -36px rgba(0, 0, 0, 0.95);
}

.nav-inner {
  height: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 48px);
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
}

.brand-mark {
  width: 20px;
  height: 20px;
  border-radius: 6px;
  background: var(--silver);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.12), 0 6px 22px rgba(140, 160, 255, 0.28);
  flex: none;
}

.brand-name {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.26em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-links a {
  position: relative;
  font-size: 13.5px;
  color: var(--muted);
  transition: color 0.3s var(--ease);
}

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

.nav-links a.is-active { color: var(--text); }

.nav-links a.is-active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -8px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text);
  transform: translateX(-50%);
}

.nav-cta {
  padding: 9px 18px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 13px;
  color: var(--text);
  transition: background 0.3s var(--ease), color 0.3s var(--ease), border-color 0.3s var(--ease);
}

.nav-cta:hover {
  background: var(--white);
  color: #000;
  border-color: var(--white);
}

.nav-toggle {
  display: none;
  width: 34px;
  height: 34px;
  padding: 8px 6px;
  flex-direction: column;
  justify-content: space-between;
}

.nav-toggle span {
  display: block;
  height: 1px;
  background: var(--text);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  transition: transform 0.35s var(--ease), background 0.35s var(--ease),
    color 0.35s var(--ease), border-color 0.35s var(--ease);
}

.btn:hover { transform: translateY(-2px); }

.btn--solid {
  background: var(--white);
  color: #000;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7), 0 12px 34px -20px rgba(255, 255, 255, 0.4);
}

.btn--solid:hover {
  background: #e9e9ee;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7), 0 18px 40px -18px rgba(255, 255, 255, 0.5);
}

.btn--ghost { border: 1px solid var(--line-strong); color: var(--text); }
.btn--ghost:hover { border-color: var(--white); }

.btn--text {
  padding: 0;
  border-radius: 0;
  color: var(--muted);
}

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

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

/* ---------- hero ---------- */

.hero {
  position: relative;
  /* 老浏览器不认识 svh，先用 vh 兜底，否则首屏会塌成内容高度 */
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-top: calc(var(--nav-h) + 32px);
  overflow: hidden;
  isolation: isolate;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: -2;
  background: #050506 url("../img/poster-xueyue.jpg") center / cover no-repeat;
}

.hero-media video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1.4s var(--ease);
}

.hero-media video.is-active { opacity: 1; }

.hero-scrim {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(132% 108% at 50% 44%, rgba(0, 0, 0, 0) 34%, rgba(0, 0, 0, 0.66) 100%),
    linear-gradient(180deg, rgba(0, 0, 0, 0.68) 0%, rgba(0, 0, 0, 0.16) 30%, rgba(0, 0, 0, 0.52) 66%, rgba(0, 0, 0, 0.94) 100%),
    linear-gradient(94deg, rgba(0, 0, 0, 0.66) 0%, rgba(0, 0, 0, 0.14) 44%, rgba(0, 0, 0, 0) 72%);
}

/* 极细胶片颗粒，让首屏更像银幕而不是网页背景 */
.hero-grain {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.06;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/></filter><rect width='160' height='160' filter='url(%23n)'/></svg>");
  background-size: 180px 180px;
}

.hero-inner {
  position: relative;
  flex: 1 1 auto;
  display: flex;
  align-items: flex-end;
  width: 100%;
  padding-bottom: clamp(44px, 6.5vh, 78px);
}

.hero-copy { max-width: 44rem; }

.hero-brand {
  margin: 0;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.72);
}

.hero-rule {
  display: block;
  width: 64px;
  height: 1px;
  margin: 18px 0 26px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0));
}

.hero-title {
  margin: 0;
  font-size: clamp(2rem, 8.6vw, 4.35rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.038em;
  background: linear-gradient(100deg, #ffffff 0%, #dedee4 42%, #9c9ca4 72%, #f2f2f6 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lede {
  margin: 22px 0 0;
  max-width: 48ch;
  font-size: clamp(0.94rem, 1.15vw, 1.05rem);
  color: rgba(255, 255, 255, 0.62);
}

/* 底部信息带：左边作品类型，右边正在播放的片段 */
.hero-meta {
  position: relative;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  background: linear-gradient(180deg, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.45) 100%);
}

.hero-meta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding-top: 18px;
  padding-bottom: 20px;
}

.hero-kinds {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.hero-kinds li {
  position: relative;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.56);
}

.hero-kinds li + li::before {
  content: "";
  position: absolute;
  left: -14px;
  top: 50%;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.28);
}

.hero-now {
  display: flex;
  align-items: center;
  gap: 14px;
  white-space: nowrap;
}

.hero-now-index {
  font-size: 11px;
  letter-spacing: 0.2em;
  font-variant-numeric: tabular-nums;
  color: rgba(255, 255, 255, 0.4);
}

.hero-now-title {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.92);
}

.hero-now-tag {
  padding: 3px 10px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.66);
}

.hero-now-track {
  position: relative;
  width: 88px;
  height: 2px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.26);
}

.hero-now-bar {
  position: absolute;
  inset: 0;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.55), #ffffff);
}

@media (prefers-reduced-motion: no-preference) {
  .hero-media video.is-active {
    animation: heroDrift 26s var(--ease) infinite alternate;
  }
}

@keyframes heroDrift {
  from { transform: scale(1.005); }
  to { transform: scale(1.055); }
}

/* ---------- work cards ---------- */

.grid {
  display: grid;
  gap: clamp(30px, 3.6vw, 54px) clamp(24px, 3vw, 40px);
}

.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

/* 细线分栏的能力 / 流程清单，比卡片更轻 */
.spec-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  column-gap: clamp(24px, 3vw, 48px);
  row-gap: 0;
}

.spec-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.spec-grid .service {
  padding: 24px 0 28px;
  border-top: 1px solid var(--line);
}

/* 生产流程一行走完 */
.flow {
  margin: 30px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  line-height: 2;
  color: var(--dim);
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, #121216 0%, #0d0d10 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.045);
  transition: transform 0.7s var(--ease), border-color 0.7s var(--ease),
    box-shadow 0.7s var(--ease);
}

.card:hover {
  transform: translateY(-8px);
  border-color: var(--line-strong);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06), 0 42px 70px -42px rgba(0, 0, 0, 0.95);
}

.card--wide { grid-column: span 2; }

/* 横向特稿卡：整行宽度，封面在左、信息在右 */
.card--feature {
  grid-column: 1 / -1;
  flex-direction: row;
}

.card--feature .card-media {
  flex: 1 1 52%;
  min-width: 0;
}

.card--feature .card-body {
  flex: 1 1 48%;
  min-width: 0;
  border-top: 0;
  border-left: 1px solid var(--line);
  padding: clamp(26px, 3vw, 40px) clamp(24px, 3vw, 40px);
  justify-content: center;
}

.card--feature .card-body::before {
  top: 0;
  bottom: 0;
  left: -1px;
  right: auto;
  width: 1px;
  height: auto;
  background: linear-gradient(180deg, #ffffff 0%, rgba(255, 255, 255, 0.3) 55%, rgba(255, 255, 255, 0) 100%);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 1s var(--ease);
}

.card--feature:hover .card-body::before { transform: scaleY(1); }

.card--feature .card-spec {
  margin-top: 0;
  padding-top: 20px;
}

.card-media {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #0b0b0d;
}

/* 剧照底部压暗，让封面更像电影截帧而不是网页配图 */
.card-media::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 44%;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.52) 100%);
  opacity: 0.75;
  transition: opacity 0.7s var(--ease);
}

.card:hover .card-media::after { opacity: 1; }

.card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 1.4s var(--ease), filter 0.8s var(--ease);
}

.card:hover .card-media img {
  transform: scale(1.06);
  filter: brightness(0.86) saturate(1.06);
}

.card-hover {
  position: absolute;
  inset: 0;
  z-index: 4;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s var(--ease);
}

.card:hover .card-hover { opacity: 1; }

.play-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  pointer-events: auto;
  padding: 11px 20px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.94);
  color: #000;
  font-size: 13px;
  font-weight: 500;
  transform: translateY(8px);
  transition: transform 0.5s var(--ease);
}

.card:hover .play-pill { transform: translateY(0); }

.play-pill::before {
  content: "";
  width: 0;
  height: 0;
  border-left: 8px solid #000;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
}

.card-body {
  position: relative;
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 26px clamp(20px, 2.2vw, 28px) clamp(22px, 2.4vw, 28px);
  border-top: 1px solid var(--line);
}

/* 悬停时从左侧扫过的一道银色细线 */
.card-body::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, #ffffff 0%, rgba(255, 255, 255, 0.3) 55%, rgba(255, 255, 255, 0) 100%);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 1s var(--ease);
}

.card:hover .card-body::before { transform: scaleX(1); }

.card-body p { margin: 0; }

.card-eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.card-index {
  color: var(--dim);
  font-variant-numeric: tabular-nums;
}

.card-type { color: rgba(255, 255, 255, 0.84); }

.card-title {
  margin: 0;
  font-size: clamp(1.12rem, 1.55vw, 1.34rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.35;
  transition: transform 0.7s var(--ease);
}

.card:hover .card-title { transform: translateX(2px); }

.card-logline {
  font-size: 14px;
  line-height: 1.66;
  color: var(--muted);
}

.card-spec {
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--dim);
}

.card-link { position: absolute; inset: 0; z-index: 3; }

/* ---------- filters ---------- */

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.filter {
  padding: 9px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
  transition: all 0.3s var(--ease);
}

.filter:hover {
  color: var(--text);
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.03);
}

.filter.is-active {
  background: var(--white);
  border-color: var(--white);
  color: #000;
  box-shadow: 0 10px 26px -18px rgba(255, 255, 255, 0.5);
}

.is-hidden { display: none !important; }

/* ---------- capability strip ---------- */

.strip {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 34px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.strip li {
  position: relative;
  font-size: 14px;
  color: var(--muted);
}

.strip li + li::before {
  content: "";
  position: absolute;
  left: -18px;
  top: 50%;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--dim);
}

/* ---------- services / feature list ---------- */

.service {
  padding: 28px 0 30px;
  border-top: 1px solid var(--line);
}

.service-index {
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--dim);
}

.service h3 { margin: 14px 0 10px; }
.service p { margin: 0; color: var(--muted); font-size: 14.5px; }
.service ul { margin: 16px 0 0; padding: 0; list-style: none; }

.service li {
  font-size: 13.5px;
  color: var(--dim);
  padding: 5px 0;
}

.service li::before {
  content: "—";
  margin-right: 10px;
  color: var(--line-strong);
}

/* ---------- about ---------- */

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
}

.portrait {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
}

.portrait img {
  width: 100%;
  /* 预留 3:4（与 portrait.jpg 一致）。图片是懒加载的，
     不预留高度的话加载完成时整个关于区块会往下跳。 */
  aspect-ratio: 3 / 4;
  object-fit: cover;
  transition: transform 1.2s var(--ease);
}

.portrait:hover img { transform: scale(1.02); }

.portrait figcaption {
  padding: 14px 18px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--dim);
  border-top: 1px solid var(--line);
}

/* ---------- contact ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 24px);
}

.contact-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 26px 26px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  transition: border-color 0.4s var(--ease), transform 0.5s var(--ease), background 0.4s var(--ease);
}

.contact-card:hover {
  border-color: var(--line-strong);
  background: var(--panel-2);
  transform: translateY(-4px);
}

.contact-card .label {
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--dim);
}

.contact-card .value {
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  font-weight: 500;
  letter-spacing: -0.01em;
  word-break: break-all;
}

.contact-card .hint { font-size: 13px; color: var(--dim); }

/* 可点击的联系方式给一个明确的可点提示 */
a.contact-card::after {
  content: "↗";
  position: absolute;
  top: 22px;
  right: 24px;
  font-size: 13px;
  color: var(--dim);
  transition: transform 0.4s var(--ease), color 0.4s var(--ease);
}

a.contact-card:hover::after {
  color: var(--text);
  transform: translate(2px, -2px);
}

.is-placeholder { color: var(--dim); border-bottom: 1px dashed var(--line-strong); }

/* ---------- project detail ---------- */

.project-hero {
  position: relative;
  min-height: min(72vh, 640px);
  display: flex;
  align-items: flex-end;
  padding: calc(var(--nav-h) + 56px) 0 clamp(28px, 5vh, 56px);
  overflow: hidden;
  isolation: isolate;
}

.project-hero img {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.project-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0.25) 40%, rgba(0, 0, 0, 0.92) 100%);
}

.project-hero h1 {
  margin: 0;
  font-size: clamp(2.1rem, 5.4vw, 4rem);
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: -0.035em;
}

.spec-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.spec-row .label {
  display: block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--dim);
}

.spec-row .value { font-size: 15px; color: var(--text); }

.block {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: clamp(24px, 4vw, 60px);
  padding: clamp(48px, 7vw, 92px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.block > p { margin: 0; font-size: clamp(1rem, 1.5vw, 1.15rem); color: #d8d8dd; line-height: 1.85; }

.highlights {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px clamp(24px, 4vw, 48px);
}

.highlight { padding-top: 18px; border-top: 1px solid var(--line); }

.highlight .num { font-size: 11px; letter-spacing: 0.24em; color: var(--dim); }
.highlight h3 { margin: 12px 0 8px; font-size: 1.05rem; font-weight: 600; }
.highlight p { margin: 0; font-size: 14px; color: var(--muted); }

.player {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: #06060a;
}

.player video { width: 100%; background: #000; }

/* 视频加载失败时的兜底层：留住封面，不让播放器变成黑块 */
.video-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: #06060a;
}

.video-fallback img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.45;
}

.video-fallback-inner {
  position: relative;
  max-width: 34ch;
  padding: 24px;
  text-align: center;
}

.video-fallback-title {
  margin: 0 0 8px;
  font-size: 15px;
  color: var(--text);
}

.video-fallback-note {
  margin: 0 0 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.video-fallback-note code {
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 12.5px;
  color: #d8d8dd;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(12px, 1.6vw, 18px);
}

.gallery button {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--line);
  padding: 0;
}

.gallery img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.9s var(--ease), opacity 0.5s var(--ease);
}

.gallery button:hover img { transform: scale(1.05); opacity: 0.85; }

.pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  padding: clamp(40px, 6vw, 72px) 0 0;
}

.pager a {
  padding: 24px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.4s var(--ease), background 0.4s var(--ease);
}

.pager a:hover { border-color: var(--line-strong); background: var(--panel); }
.pager .label { display: block; margin-bottom: 8px; font-size: 11px; letter-spacing: 0.22em; text-transform: uppercase; color: var(--dim); }
.pager .value { font-size: 1.05rem; font-weight: 500; }
.pager .next { text-align: right; }

/* ---------- modal / lightbox ---------- */

.modal {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(16px, 4vw, 56px);
  background: rgba(0, 0, 0, 0.86);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s var(--ease), visibility 0.4s var(--ease);
}

.modal.is-open { opacity: 1; visibility: visible; }

.modal-inner {
  width: 100%;
  max-width: 1180px;
  transform: scale(0.985);
  transition: transform 0.5s var(--ease);
}

.modal.is-open .modal-inner { transform: scale(1); }

.modal-inner video,
.modal-inner img {
  width: 100%;
  max-height: 76vh;
  max-height: 76svh;
  object-fit: contain;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #000;
}

/* 视频元数据到达前先占住 16:9，避免弹层高度从 2px 跳到成片比例 */
.modal-inner video { aspect-ratio: 16 / 9; }

.modal-caption {
  margin: 16px 0 0;
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dim);
}

.modal-close {
  position: fixed;
  top: clamp(14px, 3vw, 28px);
  right: clamp(14px, 3vw, 28px);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: rgba(0, 0, 0, 0.5);
  font-size: 18px;
  line-height: 1;
}

.modal-close:hover { background: var(--white); color: #000; }

/* ---------- footer ---------- */

.footer {
  position: relative;
  padding: clamp(56px, 8vw, 96px) 0 40px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.022) 0%, rgba(0, 0, 0, 0) 62%);
}

/* 页脚顶部一枚极淡的大字品牌名，像片尾字幕 */
.footer::before {
  content: "LULU AI STUDIO";
  display: block;
  max-width: var(--maxw);
  margin: 0 auto clamp(34px, 4.6vw, 60px);
  padding: 0 clamp(20px, 5vw, 48px);
  font-size: clamp(2.1rem, 8.6vw, 6.6rem);
  font-weight: 600;
  line-height: 0.94;
  letter-spacing: -0.03em;
  color: rgba(255, 255, 255, 0.055);
  white-space: nowrap;
  overflow: hidden;
  user-select: none;
  pointer-events: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.footer-brand { display: flex; gap: 14px; }
.footer-name { margin: 0; font-size: 12px; font-weight: 600; letter-spacing: 0.26em; }
.footer-tag { margin: 10px 0 0; font-size: 13px; color: var(--dim); }

.footer-links { display: flex; flex-wrap: wrap; gap: 20px; font-size: 13.5px; color: var(--muted); }
.footer-links a:hover { color: var(--text); }

.footer-contact { text-align: right; font-size: 13.5px; color: var(--muted); }
.footer-contact a:hover { color: var(--text); }

.footer-bottom {
  margin-top: 44px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-size: 12px;
  color: var(--dim);
}

/* ---------- reveal on scroll ---------- */

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}

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

/* ---------- 全站胶片颗粒 + 顶部进度线（由 main.js 注入） ---------- */

.grain-layer {
  position: fixed;
  inset: 0;
  z-index: 200;
  pointer-events: none;
  opacity: 0.032;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/></filter><rect width='200' height='200' filter='url(%23n)'/></svg>");
  background-size: 200px 200px;
}

.scroll-line {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 210;
  width: 100%;
  height: 1px;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.22), #ffffff);
  pointer-events: none;
}

/* ---------- responsive ---------- */

@media (max-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .card--wide { grid-column: span 2; }
  .spec-grid,
  .spec-grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .spec-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-contact { grid-column: span 2; text-align: left; }
}

@media (max-width: 780px) {
  /* 菜单打开时锁住页面滚动，并铺一层遮罩：点遮罩即可关闭菜单 */
  body.nav-open { overflow: hidden; }

  .nav-inner { position: relative; z-index: 2; }

  .nav.is-open::after {
    content: "";
    position: fixed;
    /* .nav 上的 backdrop-filter 会让它成为 fixed 后代的包含块，
       所以这里用 top + 明确高度，而不是 top/bottom 一起写。 */
    top: var(--nav-h);
    right: 0;
    left: 0;
    height: calc(100vh - var(--nav-h));
    height: calc(100svh - var(--nav-h));
    z-index: 1;
    background: rgba(4, 4, 6, 0.74);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.35s var(--ease), visibility 0.35s var(--ease);
  }

  .nav.is-open::after { opacity: 1; visibility: visible; }

  .nav-links {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    z-index: 3;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 18px clamp(20px, 5vw, 48px) 26px;
    background: rgba(6, 6, 8, 0.97);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--line);
    /* 横屏等矮视口里菜单不能超出屏幕，超出部分自己滚动 */
    max-height: calc(100vh - var(--nav-h));
    max-height: calc(100svh - var(--nav-h));
    overflow-y: auto;
    overscroll-behavior: contain;
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.35s var(--ease);
  }

  .nav-links a { padding: 14px 0; font-size: 16.5px; }
  .nav-links a.is-active::after { display: none; }
  .nav.is-open .nav-links { transform: none; opacity: 1; visibility: visible; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; width: 44px; height: 44px; padding: 14px 10px; }
  .nav.is-open .nav-toggle span:first-child { transform: translateY(7px) rotate(45deg); }
  .nav.is-open .nav-toggle span:last-child { transform: translateY(-7px) rotate(-45deg); }

  .grid--3,
  .grid--2,
  .spec-grid,
  .spec-grid--4,
  .about-grid,
  .contact-grid,
  .highlights,
  .pager { grid-template-columns: minmax(0, 1fr); }

  .card--wide { grid-column: span 1; }
  .card--feature { flex-direction: column; }
  .card--feature .card-media { flex: none; }
  .card--feature .card-body {
    flex: none;
    border-left: 0;
    border-top: 1px solid var(--line);
    padding: 24px 22px 26px;
  }
  .card--feature .card-body::before { display: none; }
  .card--feature .card-spec { padding-top: 18px; }
  .block { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .block .eyebrow { margin-bottom: 0; }
  .hero-inner { padding-bottom: 40px; }
  .hero-meta-inner { flex-direction: column; align-items: flex-start; gap: 14px; }
  .hero-kinds { gap: 6px 12px; font-size: 11px; }
  .hero-kinds li + li::before { left: -8px; }
  .hero-now-track { display: none; }

  /* --- 手机端排版与触控尺寸 --- */
  .hero-inner { padding-bottom: 36px; }
  .hero-lede { font-size: 15.5px; max-width: none; }

  /* 正文与说明文字的基线尺寸：手机上手举距离更远，比桌面再大一点 */
  .lede, .section-head .lede { font-size: 16px; }
  .service p, .highlight p { font-size: 15px; }
  .block > p { font-size: 16px; }

  /* 11px 的小标签在手机上偏小，统一提到 12px，字距略收，气势不变但看得清 */
  .eyebrow,
  .card-eyebrow,
  .contact-card .label,
  .spec-row .label,
  .pager .label,
  .service-index,
  .highlight .num,
  .meta-text,
  .modal-caption { font-size: 12px; }

  .eyebrow { letter-spacing: 0.26em; }
  .hero-brand { font-size: 12px; letter-spacing: 0.28em; }
  .card-eyebrow { letter-spacing: 0.2em; }
  .contact-card .label,
  .spec-row .label { letter-spacing: 0.2em; }

  /* 章节头在手机上改为上下堆叠，右侧说明文字不再被挤成窄条 */
  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
  }

  .hero-now-title { font-size: 13.5px; }
  .hero-now-index { font-size: 12px; }
  .hero-now-tag { font-size: 12px; padding: 4px 11px; letter-spacing: 0.12em; }
  .brand { padding: 12px 0; }

  .btn { padding: 14px 26px; font-size: 14.5px; min-height: 48px; }
  .btn--text { padding: 14px 0; min-height: 0; }
  .filter { padding: 11px 20px; font-size: 13.5px; }

  .card-title { font-size: 1.22rem; }
  .card-logline { font-size: 15px; }
  .card-spec { font-size: 13px; }

  .contact-card { padding: 24px 22px 26px; min-height: 104px; }
  .contact-card .value { font-size: 17px; }
  .contact-card .hint { font-size: 14px; }
  a.contact-card::after { top: 24px; right: 22px; }

  /* 文字链接也要有 44px 左右的触控面积，同时保持左边缘对齐 */
  .footer-links { gap: 0 8px; margin-left: -8px; }
  .footer-links a { padding: 12px 8px; font-size: 14px; }
  .footer-contact a { display: inline-block; padding: 12px 0; }
  .pager a { padding: 22px 22px 24px; }
  .footer-tag { font-size: 13.5px; }
  .footer-bottom { font-size: 12.5px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-contact { grid-column: span 1; text-align: left; }
  .footer-bottom { flex-direction: column; }
}

@media (max-width: 520px) {
  .gallery { grid-template-columns: minmax(0, 1fr); }
  .spec-row { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  /* 极窄屏：去掉分隔点，换行时不会出现行首孤立圆点 */
  .hero-kinds { gap: 6px 16px; }
  .hero-kinds li + li::before { display: none; }
}

/* ---------- 横屏手机 / 矮视口 ----------
   只有 300–400px 的高度可用时，桌面级的超大标题会把首屏整个吃掉，
   导航也显得过高。这里整体收紧一档，让首屏内容仍然完整可读。 */

@media (max-height: 560px) and (orientation: landscape) {
  :root { --nav-h: 56px; }

  .nav-inner { gap: 18px; }
  .nav-links { gap: 22px; }

  .hero { padding-top: calc(var(--nav-h) + 14px); }
  .hero-inner { padding-bottom: 16px; }
  .hero-copy { max-width: 38rem; }
  .hero-brand { font-size: 11px; }
  .hero-rule { width: 48px; margin: 10px 0 13px; }
  .hero-title { font-size: clamp(1.5rem, 4.3vw, 2.15rem); line-height: 1.1; }
  .hero-lede { margin-top: 12px; font-size: 14px; }
  .btn-row { margin-top: 16px; gap: 10px; }
  .btn { padding: 11px 20px; min-height: 44px; }

  .hero-meta-inner { padding-top: 10px; padding-bottom: 12px; gap: 10px; }
  .hero-kinds { font-size: 11.5px; gap: 4px 18px; }
  .hero-kinds li + li::before { left: -11px; }
  .hero-now-index, .hero-now-title, .hero-now-tag { font-size: 12px; }

  /* 段落间距同步收一档，横屏滚动不至于三步一屏 */
  .section { padding: clamp(44px, 7vh, 72px) 0; }
  .section--top { padding-top: calc(var(--nav-h) + clamp(20px, 4.5vh, 44px)); }
  .section-head { margin-bottom: clamp(24px, 4vh, 40px); }

  /* 够宽（如横屏 iPad / 大屏手机）时，底栏改回一行更省高度 */
  .project-hero { min-height: min(88vh, 460px); padding-top: calc(var(--nav-h) + 28px); }
}

@media (max-height: 560px) and (orientation: landscape) and (min-width: 781px) {
  .hero-meta-inner { flex-direction: row; align-items: center; gap: 20px; }
  .hero-kinds { font-size: 11.5px; }
  .hero-now-track { display: block; width: 64px; }
}

/* ---------- 触摸设备：去掉会“粘住”的悬停态，换成按下反馈 ---------- */

@media (hover: none) {
  .card:hover {
    transform: none;
    border-color: var(--line);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.045);
  }

  .card:hover .card-media img { transform: none; filter: none; }
  .card:hover .card-media::after { opacity: 0.75; }
  .card:hover .card-title { transform: none; }
  .card:hover .card-body::before { transform: scaleX(0); }
  .card-hover { display: none; }

  .btn:hover { transform: none; }
  .contact-card:hover { transform: none; background: var(--panel); }
  .portrait:hover img { transform: none; }
  .gallery button:hover img { transform: none; opacity: 1; }
  .pager a:hover { background: none; }

  .card:active { transform: scale(0.995); }
  .btn:active { transform: scale(0.98); }
  .contact-card:active { background: var(--panel-2); border-color: var(--line-strong); }
  .filter:active { background: rgba(255, 255, 255, 0.06); }
  .nav-toggle:active { opacity: 0.55; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-media video { transition: none; }
  * { animation-duration: 0.001ms !important; }
}