/* ==========================================================================
   NEXUS 星环机器人 · 设计系统
   配色：深空底 + 电光青 / 星云紫 / 品红 三色渐变（一致、高级、科技感）
   ========================================================================== */

:root {
  /* 背景层级 */
  --bg-0: #04040d;
  --bg-1: #08081a;
  --bg-2: #0d0d22;

  /* 主色 */
  --cyan: #22d3ee;
  --cyan-bright: #67e8f9;
  --violet: #8b5cf6;
  --magenta: #ec4899;
  --pink: #f472b6;

  /* 文本 */
  --text: #eef1fb;
  --text-dim: #9aa3c2;
  --text-faint: #5d6686;

  /* 材质 */
  --glass: rgba(255, 255, 255, 0.04);
  --glass-strong: rgba(255, 255, 255, 0.08);
  --stroke: rgba(255, 255, 255, 0.10);
  --stroke-bright: rgba(255, 255, 255, 0.18);

  /* 渐变 */
  --grad: linear-gradient(120deg, var(--cyan) 0%, var(--violet) 50%, var(--magenta) 100%);
  --grad-text: linear-gradient(100deg, var(--cyan-bright), var(--violet) 45%, var(--pink));

  --radius: 20px;
  --radius-sm: 12px;

  --font-head: "Orbitron", "Noto Sans SC", system-ui, sans-serif;
  --font-body: "Noto Sans SC", system-ui, -apple-system, sans-serif;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow-glow: 0 0 40px rgba(34, 211, 238, 0.25);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg-0);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }

::selection { background: rgba(139, 92, 246, 0.4); color: #fff; }

/* 自定义滚动条 */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-0); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--cyan), var(--violet));
  border-radius: 10px;
  border: 2px solid var(--bg-0);
}

/* ==========================================================================
   星空（canvas 由 JS 绘制，这里仅负责定位）
   ========================================================================== */
#stars {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* 全局氛围光晕（噪声 + 顶部渐变） */
.ambient {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(1200px 600px at 50% -10%, rgba(34, 211, 238, 0.10), transparent 60%),
    radial-gradient(900px 500px at 85% 20%, rgba(139, 92, 246, 0.08), transparent 60%);
  mix-blend-mode: screen;
}

/* ==========================================================================
   导航
   ========================================================================== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  padding: 20px 0;
  transition: padding 0.4s var(--ease), background 0.4s var(--ease), backdrop-filter 0.4s;
}
.nav.scrolled {
  padding: 10px 0;
  background: rgba(6, 6, 18, 0.6);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid var(--stroke);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand-mark {
  position: relative;
  width: 34px; height: 34px;
  display: grid; place-items: center;
}
.brand-mark .ring {
  position: absolute; inset: 0;
  border-radius: 50%;
  border: 2px solid transparent;
  background: linear-gradient(135deg, var(--cyan), var(--magenta)) border-box;
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  animation: spin 6s linear infinite;
}
.brand-mark .core {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--grad);
  box-shadow: 0 0 12px rgba(139, 92, 246, 0.9);
}
.brand-text {
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 17px;
}
.brand-text em {
  font-style: normal;
  font-family: var(--font-body);
  font-weight: 500;
  margin-left: 4px;
  font-size: 13px;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}

.nav-links { display: flex; gap: 6px; }
.nav-link {
  position: relative;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--text-dim);
  border-radius: 8px;
  transition: color 0.3s;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: 2px;
  height: 2px;
  background: var(--grad);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
}
.nav-link:hover, .nav-link.active { color: var(--text); }
.nav-link:hover::after, .nav-link.active::after { transform: scaleX(1); }

.nav-actions { display: flex; align-items: center; gap: 14px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================================
   按钮
   ========================================================================== */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  overflow: hidden;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.btn svg { transition: transform 0.3s var(--ease); }
.btn:hover svg { transform: translateX(4px); }
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 8px 30px rgba(139, 92, 246, 0.35);
  background-size: 200% 200%;
}
.btn-primary::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255,255,255,0.35) 50%, transparent 70%);
  transform: translateX(-100%);
  transition: transform 0.7s var(--ease);
}
.btn-primary:hover { box-shadow: 0 12px 44px rgba(236, 72, 153, 0.45); }
.btn-primary:hover::before { transform: translateX(100%); }

.btn-ghost {
  color: var(--text);
  border: 1px solid var(--stroke-bright);
  background: var(--glass);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover { border-color: rgba(34, 211, 238, 0.5); box-shadow: var(--shadow-glow); }
.ghost-pulse {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 0 rgba(34, 211, 238, 0.6);
  animation: pulse 2s infinite;
}
.btn-sm { padding: 10px 20px; font-size: 14px; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  isolation: isolate;
}

/* 彩色渐变背景：三个光球 + 缓慢旋转的 conic 层 */
.gradient-bg {
  position: absolute; inset: -20%;
  z-index: 1;
  filter: blur(70px) saturate(140%);
  transition: filter 0.6s var(--ease), opacity 0.6s var(--ease);
  opacity: 0.55;
}
.orb { position: absolute; border-radius: 50%; }
.orb-cyan {
  width: 46%; aspect-ratio: 1;
  left: 4%; top: 6%;
  background: radial-gradient(circle, rgba(34,211,238,0.55), transparent 70%);
  animation: drift1 16s ease-in-out infinite alternate;
}
.orb-violet {
  width: 52%; aspect-ratio: 1;
  right: 2%; top: 18%;
  background: radial-gradient(circle, rgba(139,92,246,0.5), transparent 70%);
  animation: drift2 20s ease-in-out infinite alternate;
}
.orb-magenta {
  width: 40%; aspect-ratio: 1;
  left: 32%; bottom: -6%;
  background: radial-gradient(circle, rgba(236,72,153,0.45), transparent 70%);
  animation: drift3 18s ease-in-out infinite alternate;
}
/* 拖拽旋转时：增强渐变，营造「旋转时背景彩色渐变」的联动 */
.hero.dragging .gradient-bg {
  filter: blur(52px) saturate(190%) hue-rotate(20deg);
  opacity: 0.85;
}

#scene {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  z-index: 2;
  cursor: grab;
  touch-action: pan-y;
}
.hero.dragging #scene { cursor: grabbing; }

#water {
  position: absolute;
  left: 0; right: 0;
  bottom: 0;
  height: 26%;
  width: 100%;
  z-index: 3;
  pointer-events: none;
  opacity: 0.9;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, #000 18%);
  mask-image: linear-gradient(to bottom, transparent 0%, #000 18%);
}

/* 景深暗角：聚焦中心，边缘渐隐，模拟浅景深 */
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background: radial-gradient(110% 85% at 50% 46%, transparent 50%, rgba(4, 4, 13, 0.42) 100%);
}

/* DOM 浮动音符 */
.notes-layer { position: absolute; inset: 0; z-index: 4; pointer-events: none; }
.note {
  position: absolute;
  font-family: serif;
  color: rgba(255, 255, 255, 0.65);
  text-shadow: 0 0 14px rgba(34, 211, 238, 0.8), 0 0 30px rgba(139, 92, 246, 0.6);
  animation: floatNote var(--dur, 9s) var(--ease) infinite;
  opacity: 0;
}
.note-1 { left: 12%; top: 34%; font-size: 26px; --dur: 8s; animation-delay: 0s; }
.note-2 { left: 24%; top: 58%; font-size: 20px; --dur: 10s; animation-delay: 1.4s; color: rgba(139,92,246,0.7); }
.note-3 { right: 16%; top: 30%; font-size: 30px; --dur: 9s; animation-delay: 0.7s; color: rgba(236,72,153,0.7); }
.note-4 { right: 26%; top: 62%; font-size: 18px; --dur: 11s; animation-delay: 2.2s; }
.note-5 { left: 46%; top: 22%; font-size: 22px; --dur: 9.5s; animation-delay: 3.1s; color: rgba(103,232,249,0.7); }
.note-6 { right: 8%; top: 50%; font-size: 24px; --dur: 8.5s; animation-delay: 4s; color: rgba(244,114,182,0.7); }

.hero-inner {
  position: relative;
  z-index: 5;
  width: 100%;
  max-width: 1200px;
  padding: 120px 28px 40px;
  pointer-events: none;
}
.hero-content { max-width: 620px; pointer-events: auto; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--text-dim);
  text-transform: uppercase;
}
.eyebrow-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--grad);
  box-shadow: 0 0 10px rgba(34, 211, 238, 0.9);
  animation: pulse 2.4s infinite;
}

.hero-title {
  margin: 22px 0 20px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(40px, 7vw, 76px);
  line-height: 1.08;
  letter-spacing: 0.01em;
}
.grad {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  background-size: 200% 200%;
  animation: gradShift 5s ease-in-out infinite;
}

.hero-sub {
  font-size: 16px;
  color: var(--text-dim);
  max-width: 460px;
  margin-bottom: 34px;
}
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-hint {
  margin-top: 26px;
  font-size: 13px;
  color: var(--text-faint);
  letter-spacing: 0.04em;
}

.scroll-hint {
  position: absolute;
  left: 50%; bottom: 26px;
  transform: translateX(-50%);
  z-index: 6;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-faint);
  pointer-events: none;
}
.scroll-line {
  width: 1px; height: 34px;
  background: linear-gradient(var(--cyan), transparent);
  animation: scrollLine 2s var(--ease) infinite;
}
.scroll-text { font-family: var(--font-head); font-size: 10px; letter-spacing: 0.34em; }

/* ==========================================================================
   通用 section
   ========================================================================== */
.section {
  position: relative;
  z-index: 2;
  padding: 110px 28px;
  max-width: 1200px;
  margin: 0 auto;
}
.section-head { text-align: center; margin-bottom: 60px; }
.section-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(28px, 4vw, 44px);
  margin: 16px 0 14px;
}
.section-sub { color: var(--text-dim); font-size: 15px; }

/* ==========================================================================
   特性卡片
   ========================================================================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.card {
  position: relative;
  background: var(--glass);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  padding: 30px;
  backdrop-filter: blur(10px);
  transition: transform 0.45s var(--ease), border-color 0.45s, box-shadow 0.45s;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(600px circle at var(--mx, 50%) var(--my, 50%), rgba(139,92,246,0.12), transparent 45%);
  opacity: 0;
  transition: opacity 0.4s;
}
.card:hover { transform: translateY(-8px); border-color: var(--stroke-bright); box-shadow: 0 20px 50px rgba(0,0,0,0.4); }
.card:hover::before { opacity: 1; }

.feature-icon {
  width: 52px; height: 52px;
  display: grid; place-items: center;
  border-radius: 14px;
  font-size: 24px;
  margin-bottom: 20px;
  background: var(--glass-strong);
  border: 1px solid var(--stroke);
}
.i-cyan { color: var(--cyan); box-shadow: 0 0 22px rgba(34,211,238,0.25); }
.i-violet { color: var(--violet); box-shadow: 0 0 22px rgba(139,92,246,0.3); }
.i-magenta { color: var(--magenta); box-shadow: 0 0 22px rgba(236,72,153,0.3); }
.i-pink { color: var(--pink); box-shadow: 0 0 22px rgba(244,114,182,0.3); }

.feature h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.feature p { color: var(--text-dim); font-size: 14px; margin-bottom: 18px; }
.feature-tag {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 11px;
  letter-spacing: 0.06em;
  padding: 5px 12px;
  border-radius: 999px;
  color: var(--text-dim);
  background: var(--glass-strong);
  border: 1px solid var(--stroke);
}

/* ==========================================================================
   产品矩阵
   ========================================================================== */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.showcase-item { padding: 0; }
.showcase-visual {
  height: 220px;
  display: grid; place-items: center;
  font-size: 84px;
  position: relative;
  background:
    radial-gradient(circle at 50% 40%, rgba(34,211,238,0.12), transparent 70%);
}
.showcase-visual::after {
  content: "";
  position: absolute; inset: 0;
  background:
    repeating-linear-gradient(0deg, transparent 0 24px, rgba(255,255,255,0.03) 24px 25px);
  mask-image: radial-gradient(circle at 50% 45%, #000, transparent 75%);
}
.v-2 { background: radial-gradient(circle at 50% 40%, rgba(139,92,246,0.14), transparent 70%); }
.v-3 { background: radial-gradient(circle at 50% 40%, rgba(236,72,153,0.14), transparent 70%); }
.showcase-meta { padding: 24px 28px 30px; border-top: 1px solid var(--stroke); }
.showcase-meta h3 { font-size: 18px; margin-bottom: 8px; }
.showcase-meta p { color: var(--text-dim); font-size: 14px; }

/* ==========================================================================
   数据统计
   ========================================================================== */
.stats { padding-top: 40px; padding-bottom: 40px; }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  padding: 44px 28px;
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(34,211,238,0.06), rgba(139,92,246,0.06), rgba(236,72,153,0.06));
  border: 1px solid var(--stroke);
}
.stat { text-align: center; }
.stat-num {
  display: block;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 4vw, 46px);
  background: var(--grad-text);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.stat-label { color: var(--text-dim); font-size: 14px; letter-spacing: 0.04em; }

/* ==========================================================================
   技术理念
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}
.about-text p { color: var(--text-dim); margin: 22px 0; font-size: 15px; }
.about-list { display: flex; flex-direction: column; gap: 14px; margin-top: 26px; }
.about-list li { display: flex; align-items: center; gap: 12px; font-size: 15px; }
.li-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--grad);
  box-shadow: 0 0 10px rgba(139,92,246,0.8);
}

.about-visual { display: grid; place-items: center; }
.hologram {
  position: relative;
  width: 340px; height: 340px;
  display: grid; place-items: center;
}
.holo-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid transparent;
  background: linear-gradient(135deg, var(--cyan), var(--violet), var(--magenta)) border-box;
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  animation: spin var(--s, 12s) linear infinite;
}
.holo-ring.r1 { inset: 0; --s: 12s; }
.holo-ring.r2 { inset: 44px; --s: 9s; animation-direction: reverse; }
.holo-ring.r3 { inset: 88px; --s: 6s; }
.holo-core {
  font-size: 90px;
  filter: drop-shadow(0 0 26px rgba(34,211,238,0.6));
  animation: bob 4s ease-in-out infinite;
}

/* ==========================================================================
   CTA
   ========================================================================== */
.cta { padding-top: 40px; }
.cta-card {
  position: relative;
  text-align: center;
  padding: 80px 40px;
  border-radius: 28px;
  overflow: hidden;
  background: var(--glass);
  border: 1px solid var(--stroke);
}
.cta-card::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(700px 300px at 50% -20%, rgba(139,92,246,0.25), transparent 70%);
}
.cta-card h2 { font-family: var(--font-head); font-size: clamp(24px, 3.6vw, 40px); margin-bottom: 14px; position: relative; }
.cta-card p { color: var(--text-dim); margin-bottom: 32px; position: relative; }
.cta-card .btn { position: relative; }

/* ==========================================================================
   页脚
   ========================================================================== */
.footer {
  position: relative;
  z-index: 2;
  border-top: 1px solid var(--stroke);
  background: rgba(4, 4, 13, 0.7);
  backdrop-filter: blur(8px);
  margin-top: 60px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 28px 40px;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 40px;
}
.footer-brand p { color: var(--text-dim); margin-top: 16px; font-size: 14px; }
.footer-col { display: flex; flex-direction: column; gap: 12px; }
.footer-col h4 {
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--text);
  margin-bottom: 6px;
}
.footer-col a { color: var(--text-dim); font-size: 14px; transition: color 0.3s; }
.footer-col a:hover { color: var(--cyan); }
.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding: 22px 28px;
  border-top: 1px solid var(--stroke);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  color: var(--text-faint);
  font-size: 13px;
}

/* ==========================================================================
   滚动揭示
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(34px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ==========================================================================
   关键帧动画
   ========================================================================== */
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(34,211,238,0.55); }
  70% { box-shadow: 0 0 0 12px rgba(34,211,238,0); }
  100% { box-shadow: 0 0 0 0 rgba(34,211,238,0); }
}
@keyframes gradShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}
@keyframes drift1 { to { transform: translate(9vw, 7vh) scale(1.18); } }
@keyframes drift2 { to { transform: translate(-8vw, -6vh) scale(1.12); } }
@keyframes drift3 { to { transform: translate(5vw, -8vh) scale(1.2); } }
@keyframes floatNote {
  0% { transform: translateY(0) translateX(0) rotate(0deg); opacity: 0; }
  15% { opacity: 0.9; }
  50% { transform: translateY(-46px) translateX(18px) rotate(12deg); }
  85% { opacity: 0.9; }
  100% { transform: translateY(-110px) translateX(-12px) rotate(-10deg); opacity: 0; }
}
@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; opacity: 0; }
  40% { transform: scaleY(1); opacity: 1; }
  100% { transform: scaleY(0); transform-origin: bottom; opacity: 0; }
}
@keyframes bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 980px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .showcase-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .nav-links {
    position: fixed;
    top: 0; right: -100%;
    width: min(76vw, 320px);
    height: 100vh;
    flex-direction: column;
    justify-content: center;
    padding: 40px;
    background: rgba(8, 8, 24, 0.9);
    backdrop-filter: blur(20px);
    border-left: 1px solid var(--stroke);
    transition: right 0.45s var(--ease);
    gap: 8px;
  }
  .nav-links.open { right: 0; }
  .nav-link { font-size: 18px; padding: 14px; }
  .nav-toggle { display: flex; }
  .nav-actions .btn { display: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .hero { min-height: 92svh; }
  .hero-inner { padding-top: 100px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001s !important;
  }
  html { scroll-behavior: auto; }
}