/* ================= OALiLi · Apple 风格（明亮） ================= */
:root {
  --bg: #ffffff;
  --panel: #f5f5f7;
  --panel-2: #fafafc;
  --line: rgba(0, 0, 0, 0.08);
  --text: #1d1d1f;
  --muted: #6e6e73;
  --blue: #0066cc;
  --grad: linear-gradient(100deg, #0090ff 0%, #a259ff 45%, #ff5e8a 75%, #ff8a4c 100%);
  --radius-lg: 28px;
  --radius-md: 18px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "Helvetica Neue", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: rgba(0, 102, 204, 0.18); }

a { text-decoration: none; }

/* ---------- 渐变文字 ---------- */
.grad-text {
  background: var(--grad);
  background-size: 180% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: gradShift 8s ease-in-out infinite alternate;
}
@keyframes gradShift {
  from { background-position: 0% center; }
  to { background-position: 100% center; }
}

/* ---------- 蓝色链接（Apple 标志性 chevron 链接） ---------- */
.link-chevron {
  color: var(--blue);
  font-size: 19px;
  font-weight: 400;
  transition: color 0.25s;
}
.link-chevron::after {
  content: " ›";
  font-weight: 600;
}
.link-chevron:hover { color: #004494; text-decoration: underline; }

/* ---------- Navbar ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}
.nav-inner {
  max-width: 1024px;
  margin: 0 auto;
  height: 52px;
  padding: 0 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  color: var(--text);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.2px;
}
.nav-links { display: flex; align-items: center; gap: 38px; }
.nav-links a {
  color: rgba(29, 29, 31, 0.75);
  font-size: 13px;
  font-weight: 400;
  transition: color 0.25s;
}
.nav-links a:hover { color: #000; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span { width: 20px; height: 1.5px; background: var(--text); transition: 0.3s; }

/* ---------- 导航右侧 & 语言选择器 ---------- */
.nav-right { display: flex; align-items: center; gap: 28px; }
.lang-switch { position: relative; }
.lang-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  color: rgba(29, 29, 31, 0.75);
  font-size: 13px;
  font-family: var(--font);
  padding: 6px 4px;
  transition: color 0.25s;
}
.lang-btn:hover { color: #000; }
.lang-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 130px;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 6px;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.12);
  opacity: 0;
  transform: translateY(-6px) scale(0.97);
  transform-origin: top right;
  pointer-events: none;
  transition: opacity 0.22s, transform 0.22s;
}
.lang-switch.open .lang-menu {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}
.lang-menu button {
  display: block;
  width: 100%;
  text-align: left;
  padding: 9px 14px;
  border: none;
  border-radius: 9px;
  background: none;
  font-size: 13px;
  font-family: var(--font);
  color: var(--text);
  cursor: pointer;
  transition: background 0.2s;
}
.lang-menu button:hover { background: rgba(0, 0, 0, 0.05); }
.lang-menu button.active {
  color: var(--blue);
  font-weight: 600;
  background: rgba(0, 102, 204, 0.08);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 150px 24px 0;
  overflow: hidden;
  background: linear-gradient(180deg, #ffffff 0%, #fafafc 100%);
}
.hero-orb {
  position: absolute;
  top: -25%;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 900px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 35%, rgba(0, 144, 255, 0.16), transparent 55%),
    radial-gradient(circle at 65% 45%, rgba(162, 89, 255, 0.18), transparent 55%),
    radial-gradient(circle at 50% 70%, rgba(255, 94, 138, 0.14), transparent 60%);
  filter: blur(60px);
  animation: orbBreath 10s ease-in-out infinite;
  pointer-events: none;
}
@keyframes orbBreath {
  0%, 100% { transform: translateX(-50%) scale(1); opacity: 0.9; }
  50% { transform: translateX(-50%) scale(1.12); opacity: 1; }
}

.hero-content { position: relative; z-index: 2; }
.hero-eyebrow {
  font-size: 17px;
  color: var(--muted);
  letter-spacing: 1px;
  margin-bottom: 14px;
}
.hero-title {
  font-size: clamp(72px, 13vw, 168px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.02;
}
.hero-sub {
  margin-top: 18px;
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 600;
  color: var(--text);
}
.hero-links {
  margin-top: 26px;
  display: flex;
  gap: 36px;
  justify-content: center;
}

/* Hero 下方的"产品海报"装置 */
.hero-device {
  position: relative;
  z-index: 2;
  margin-top: 80px;
  width: min(880px, 92vw);
}
.device-frame {
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  padding: 10px 10px 0;
  background: linear-gradient(180deg, #ececee, #dcdce0);
  border: 1px solid var(--line);
  border-bottom: none;
  box-shadow: 0 -16px 70px rgba(162, 89, 255, 0.1), 0 24px 60px rgba(0, 0, 0, 0.06);
}
.device-screen {
  position: relative;
  border-radius: 20px 20px 0 0;
  background: #ffffff;
  min-height: 380px;
  display: grid;
  place-items: center;
  overflow: hidden;
}
.screen-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
}
.sg-1 { width: 340px; height: 340px; background: rgba(0, 144, 255, 0.22); top: -15%; left: -5%; animation: drift 12s ease-in-out infinite; }
.sg-2 { width: 380px; height: 380px; background: rgba(255, 94, 138, 0.2); bottom: -25%; right: -8%; animation: drift 14s ease-in-out infinite reverse; }
@keyframes drift {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(50px, 30px); }
}
.screen-text {
  position: relative;
  z-index: 2;
  font-size: clamp(28px, 4.5vw, 52px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Sections ---------- */
.section { padding: 130px 24px; }
.container { max-width: 1024px; margin: 0 auto; }

.section-head { margin-bottom: 56px; }
.section-head .link-chevron { display: inline-block; margin-top: 14px; }
.section-title {
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.section-title.center { text-align: center; margin-bottom: 70px; }
.title-muted { color: var(--muted); }
.section-desc { margin-top: 16px; color: var(--muted); font-size: 19px; }

/* ---------- Showcase ---------- */
.showcase { background: var(--bg); }
.case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.case-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--panel);
  cursor: pointer;
  transition: transform 0.45s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.45s;
}
.case-card:hover {
  transform: scale(1.015);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.12);
}
.case-card.span-2 { grid-column: span 2; }
.case-visual {
  position: relative;
  min-height: 340px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}
.case-card.span-2 .case-visual { min-height: 420px; }

/* ===== 纯 CSS 案例视觉（零图片请求） ===== */
/* 底色：每个案例一个主题渐变 */
.cv-1 { background: linear-gradient(135deg, #1b1040 0%, #6d28d9 55%, #ec4899 115%); }
.cv-2 { background: linear-gradient(135deg, #062a33 0%, #0e7490 60%, #22d3ee 125%); }
.cv-3 { background: linear-gradient(135deg, #3d0a24 0%, #9d174d 60%, #f472b6 125%); }
.cv-4 { background: linear-gradient(135deg, #12103a 0%, #4338ca 55%, #a259ff 120%); }
.cv-5 { background: linear-gradient(135deg, #2a0f2e 0%, #7c2d12 60%, #fb923c 125%); }
.cv-6 { background: linear-gradient(135deg, #0b0f14 0%, #164e63 70%, #22d3ee 140%); }

/* 通用：装饰层铺满 + 悬停缓慢缩放 */
.art {
  position: absolute;
  inset: 0;
  transition: transform 1.2s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.case-card:hover .art { transform: scale(1.06); }

/* 01 霓虹梦境：中心发光球体 + 光晕 */
.art-orb::before {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 200px; height: 200px;
  transform: translate(-50%, -60%);
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #f5d0fe, #c026d3 45%, #4c1d95 80%);
  box-shadow:
    0 0 60px rgba(236, 72, 153, 0.55),
    0 0 140px rgba(139, 92, 246, 0.4);
  animation: orbFloat 6s ease-in-out infinite;
}
.art-orb::after {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 320px; height: 320px;
  transform: translate(-50%, -60%);
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.18);
  animation: orbFloat 6s ease-in-out infinite reverse;
}
@keyframes orbFloat {
  0%, 100% { margin-top: 0; }
  50% { margin-top: -18px; }
}

/* 02 赛博茶室：同心圆环（茶杯俯视感） */
.art-rings::before {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 150px; height: 150px;
  transform: translate(-50%, -58%);
  border-radius: 50%;
  border: 22px solid rgba(207, 250, 254, 0.9);
  box-shadow:
    0 0 0 18px rgba(34, 211, 238, 0.25),
    0 0 60px rgba(34, 211, 238, 0.4),
    inset 0 0 30px rgba(8, 145, 178, 0.5);
}
.art-rings::after {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 60px; height: 60px;
  transform: translate(-50%, -58%);
  border-radius: 50%;
  background: radial-gradient(circle at 40% 35%, #a5f3fc, #0891b2);
  animation: teaPulse 4s ease-in-out infinite;
}
@keyframes teaPulse {
  0%, 100% { transform: translate(-50%, -58%) scale(1); }
  50% { transform: translate(-50%, -58%) scale(1.12); }
}

/* 03 数字分身：柔光人形光斑 */
.art-blob::before {
  content: "";
  position: absolute;
  top: 42%; left: 50%;
  width: 180px; height: 180px;
  transform: translate(-50%, -50%);
  border-radius: 48% 52% 55% 45% / 52% 46% 54% 48%;
  background: radial-gradient(circle at 35% 30%, #ffe4ee, #f472b6 50%, #be185d 85%);
  filter: blur(2px);
  box-shadow: 0 0 80px rgba(244, 114, 182, 0.5);
  animation: blobMorph 8s ease-in-out infinite;
}
.art-blob::after {
  content: "";
  position: absolute;
  top: 42%; left: 50%;
  width: 240px; height: 240px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px dashed rgba(255, 255, 255, 0.25);
  animation: spinSlow 24s linear infinite;
}
@keyframes blobMorph {
  0%, 100% { border-radius: 48% 52% 55% 45% / 52% 46% 54% 48%; }
  50% { border-radius: 55% 45% 46% 54% / 45% 55% 45% 55%; }
}
@keyframes spinSlow { to { transform: translate(-50%, -50%) rotate(360deg); } }

/* 04 量子潮流：透视网格 + 漂浮色块 */
.art-grid::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.14) 1px, transparent 1px);
  background-size: 56px 56px;
  transform: perspective(400px) rotateX(40deg) scale(1.6) translateY(12%);
  transform-origin: center 80%;
  mask-image: linear-gradient(to top, #000 40%, transparent 90%);
  -webkit-mask-image: linear-gradient(to top, #000 40%, transparent 90%);
}
.art-grid::after {
  content: "";
  position: absolute;
  top: 22%; left: 50%;
  width: 110px; height: 110px;
  transform: translateX(-50%) rotate(45deg);
  background: linear-gradient(135deg, rgba(196, 181, 253, 0.9), rgba(129, 140, 248, 0.4));
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: 0 0 50px rgba(162, 89, 255, 0.5);
  animation: cubeSpin 10s ease-in-out infinite;
}
@keyframes cubeSpin {
  0%, 100% { transform: translateX(-50%) rotate(45deg); }
  50% { transform: translateX(-50%) rotate(225deg); }
}

/* 05 星际餐桌：星点 + 行星环 */
.art-stars::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(2px 2px at 15% 25%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 70% 15%, #ffedd5, transparent),
    radial-gradient(2px 2px at 85% 45%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 35% 60%, #fed7aa, transparent),
    radial-gradient(2px 2px at 55% 35%, #fff, transparent),
    radial-gradient(1px 1px at 25% 80%, #ffedd5, transparent),
    radial-gradient(1.5px 1.5px at 90% 75%, #fff, transparent);
  animation: starTwinkle 3s ease-in-out infinite alternate;
}
.art-stars::after {
  content: "";
  position: absolute;
  top: 40%; left: 50%;
  width: 130px; height: 130px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #fed7aa, #ea580c 55%, #7c2d12 90%);
  box-shadow:
    -40px 10px 0 -52px rgba(255, 237, 213, 0.7),
    0 0 60px rgba(251, 146, 60, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.2);
}
@keyframes starTwinkle {
  from { opacity: 0.5; }
  to { opacity: 1; }
}

/* 06 机械心跳：速度光线 */
.art-lines::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(100deg, transparent 20%, rgba(34, 211, 238, 0.5) 20.5%, transparent 21%),
    linear-gradient(100deg, transparent 38%, rgba(34, 211, 238, 0.3) 38.5%, transparent 39%),
    linear-gradient(100deg, transparent 55%, rgba(165, 243, 252, 0.7) 55.5%, transparent 56%),
    linear-gradient(100deg, transparent 72%, rgba(34, 211, 238, 0.35) 72.5%, transparent 73%);
  animation: speedShift 2.6s linear infinite;
}
.art-lines::after {
  content: "";
  position: absolute;
  bottom: 32%; left: 50%;
  width: 220px; height: 60px;
  border-radius: 12px;
  background: linear-gradient(90deg, rgba(8, 145, 178, 0.1), rgba(34, 211, 238, 0.55), rgba(8, 145, 178, 0.1));
  filter: blur(6px);
  animation: speedGlow 2.6s ease-in-out infinite;
}
@keyframes speedShift {
  from { transform: translateX(0); }
  to { transform: translateX(-40px); }
}
@keyframes speedGlow {
  0%, 100% { transform: translateX(-50%) skewX(-18deg); opacity: 0.6; }
  50% { transform: translateX(-46%) skewX(-18deg); opacity: 1; }
}

/* 文字可读性：底部暗色遮罩 */
.case-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.55) 0%, rgba(0, 0, 0, 0.12) 45%, transparent 70%);
}
.case-label {
  position: relative;
  z-index: 2;
  padding: 32px;
}
.case-kicker {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}
.case-label h3 {
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #ffffff;
}

/* ---------- Stats ---------- */
.stats { background: var(--panel); }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
}
.stat {
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: 48px 20px;
  transition: transform 0.4s, box-shadow 0.4s;
}
.stat:hover { transform: translateY(-4px); box-shadow: 0 16px 40px rgba(0, 0, 0, 0.08); }
.stat-num {
  font-size: clamp(40px, 5vw, 60px);
  font-weight: 700;
  letter-spacing: -0.02em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat p { margin-top: 10px; color: var(--muted); font-size: 15px; }

/* ---------- Services · Bento ---------- */
.services { background: var(--bg); }
.bento {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.bento-card {
  position: relative;
  border-radius: var(--radius-lg);
  background: var(--panel);
  padding: 48px 40px;
  min-height: 260px;
  overflow: hidden;
  transition: transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.4s;
}
.bento-card:hover { transform: scale(1.015); box-shadow: 0 24px 60px rgba(0, 0, 0, 0.1); }
.bento-card.b-large { grid-row: span 2; min-height: 540px; display: flex; flex-direction: column; justify-content: flex-end; }
.bento-card.b-wide { grid-column: span 2; min-height: 220px; }
.bento-glow {
  position: absolute;
  width: 420px; height: 420px;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.35;
  pointer-events: none;
}
.bg-1 { background: #c4b5fd; top: -20%; right: -20%; }
.bg-2 { background: #a5f3fc; bottom: -40%; left: -20%; }
.bg-3 { background: #fbcfe8; top: -30%; right: -15%; }
.bg-4 { background: #c7d2fe; bottom: -60%; right: 10%; }
.bento-card h3 {
  position: relative;
  z-index: 2;
  font-size: clamp(24px, 2.6vw, 32px);
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.bento-card p {
  position: relative;
  z-index: 2;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.7;
  max-width: 420px;
}
.bento-icon {
  position: absolute;
  top: 36px; right: 36px;
  z-index: 2;
  font-size: 30px;
  color: rgba(29, 29, 31, 0.25);
}

/* ---------- About ---------- */
.about { text-align: center; background: var(--panel); }
.about-inner { max-width: 820px; }
.about-eyebrow {
  color: var(--blue);
  font-size: 19px;
  font-weight: 600;
  margin-bottom: 22px;
}
.about-statement {
  font-size: clamp(34px, 5.2vw, 56px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
}
.about-desc {
  margin-top: 34px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.9;
  text-align: left;
}
.about-quote {
  margin-top: 28px;
  font-size: 21px;
  font-weight: 600;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Contact ---------- */
.contact { background: var(--bg); }
.contact-form { max-width: 680px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  font-size: 16px;
  font-family: var(--font);
  outline: none;
  transition: border-color 0.25s, box-shadow 0.25s, background 0.25s;
  resize: vertical;
}
.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--blue);
  background: #ffffff;
  box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.12);
}
.contact-form input::placeholder,
.contact-form textarea::placeholder { color: rgba(110, 110, 115, 0.65); }
.btn-pill {
  align-self: center;
  margin-top: 8px;
  padding: 14px 44px;
  border: none;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  font-size: 17px;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  transition: background 0.25s, transform 0.25s;
}
.btn-pill:hover { background: #0077ed; transform: scale(1.03); }
.btn-pill:active { transform: scale(0.98); }
.btn-pill:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

/* ---------- 防机器人：蜜罐 & 验证码 ---------- */
.hp-field {
  position: absolute !important;
  left: -9999px !important;
  width: 1px !important;
  height: 1px !important;
  opacity: 0 !important;
  pointer-events: none !important;
}
.captcha-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.captcha-label {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--muted);
  padding: 0 4px;
  white-space: nowrap;
}
.captcha-label strong {
  color: var(--text);
  font-size: 16px;
  letter-spacing: 1px;
}
.captcha-row input { flex: 1; }
.captcha-refresh {
  flex-shrink: 0;
  width: 48px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
  transition: color 0.25s, border-color 0.25s, transform 0.4s;
}
.captcha-refresh:hover { color: var(--blue); border-color: var(--blue); }
.captcha-refresh:active svg { transform: rotate(180deg); }
.captcha-refresh svg { transition: transform 0.4s; }
.form-tip { text-align: center; font-size: 14px; color: var(--blue); min-height: 20px; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding: 40px 24px 28px;
  background: var(--panel);
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
.footer-logo { font-size: 17px; font-weight: 600; }
.footer-logo span { color: var(--muted); font-weight: 400; font-size: 14px; margin-left: 6px; }
.footer-social { display: flex; gap: 12px; }
.footer-social a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--muted);
  font-size: 13px;
  transition: color 0.25s, border-color 0.25s, box-shadow 0.25s, transform 0.25s;
}
.footer-social a svg { width: 15px; height: 15px; }
.footer-social a:hover {
  color: var(--text);
  border-color: rgba(0, 0, 0, 0.2);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}
.footer-legal {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 20px;
  color: var(--muted);
  font-size: 12px;
}

/* ---------- Reveal Animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.9s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.45s; }

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 52px; left: 0; right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    padding: 12px 22px 22px;
    border-bottom: 1px solid var(--line);
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity 0.3s, transform 0.3s;
  }
  .nav-links.open { opacity: 1; transform: translateY(0); pointer-events: auto; }
  .nav-links a { padding: 13px 0; font-size: 15px; width: 100%; }

  .case-grid { grid-template-columns: 1fr; }
  .case-card.span-2 { grid-column: span 1; }
  .case-card.span-2 .case-visual { min-height: 340px; }
  .bento { grid-template-columns: 1fr; }
  .bento-card.b-large { grid-row: span 1; min-height: 300px; }
  .bento-card.b-wide { grid-column: span 1; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: 1fr; }
  .section { padding: 90px 20px; }
  .device-screen { min-height: 280px; }
  .about-desc { text-align: center; }
  .footer-top { flex-direction: column; justify-content: center; text-align: center; }
  .footer-legal { justify-content: center; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}