/* =========================================================
   Serial Console · 首页设计系统
   工业仪表台 / 深色主题 / WCAG AA 对比度
   与 serial/ 控制台共用视觉语言
   ========================================================= */

/* ---------- 设计令牌 ---------- */
:root {
  /* 背景层（从深到浅） */
  --bg-900: #07090e;
  --bg-850: #0a0e14;
  --bg-800: #0f141d;
  --bg-700: #161c28;
  --bg-600: #1f2735;

  /* 边框 */
  --border: #232c3d;
  --border-strong: #324056;
  --border-soft: #1a2230;

  /* 文本（对比度满足 AA） */
  --text: #e8ecf2;        /* ~16:1 on bg-850 */
  --text-2: #aab3c4;      /* ~8:1 */
  --text-3: #7c8699;      /* ~5:1 */
  --text-4: #5a6376;      /* 装饰用 */

  /* 品牌色 */
  --amber: #ff8c42;       /* ~6.4:1 on bg-850 */
  --amber-soft: #ffa666;
  --amber-deep: #cc6e34;
  --phosphor: #3dd68c;    /* ~9:1 */
  --phosphor-soft: #5cf0a8;
  --alert: #ff6b6b;
  --info: #5ab0ff;

  /* 功能 */
  --radius: 10px;
  --radius-sm: 7px;
  --radius-lg: 16px;
  --radius-xl: 22px;
  --container: 1140px;
  --header-h: 64px;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow: 0 12px 36px rgba(0, 0, 0, 0.4);
  --shadow-glow-amber: 0 0 0 1px rgba(255, 140, 66, 0.25), 0 10px 34px rgba(255, 140, 66, 0.2);
  --shadow-glow-phosphor: 0 0 0 1px rgba(61, 214, 140, 0.25), 0 10px 34px rgba(61, 214, 140, 0.16);

  /* 字体 */
  --font-sans: "Sora", system-ui, -apple-system, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

/* ---------- 重置 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg-900);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img,
svg {
  max-width: 100%;
  display: block;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  font: inherit;
  color: inherit;
}
ul,
ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

/* ---------- 无障碍 ---------- */
:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
  border-radius: 4px;
}
.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 100;
  background: var(--amber);
  color: #0a0e14;
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 600;
  transition: top 0.2s;
}
.skip-link:focus {
  top: 12px;
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- 布局 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}
.muted {
  color: var(--text-3);
}

/* ---------- 按钮 ---------- */
.btn {
  --btn-bg: var(--bg-700);
  --btn-fg: var(--text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.14s ease, background 0.18s, border-color 0.18s, box-shadow 0.18s;
  white-space: nowrap;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn:active {
  transform: translateY(0);
}
.btn-primary {
  --btn-bg: var(--amber);
  --btn-fg: #0a0e14;
  border-color: var(--amber-soft);
  box-shadow: var(--shadow-glow-amber);
}
.btn-primary:hover {
  background: var(--amber-soft);
}
.btn-ghost {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-ghost:hover {
  background: var(--bg-700);
  border-color: var(--text-3);
}
.btn-lg {
  padding: 13px 24px;
  font-size: 1rem;
}
.btn-block {
  width: 100%;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: rgba(10, 14, 20, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-soft);
}
.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(145deg, rgba(255, 140, 66, 0.18), rgba(255, 140, 66, 0.04));
  border: 1px solid rgba(255, 140, 66, 0.35);
  color: var(--amber);
}
.brand-accent {
  color: var(--amber);
}
.primary-nav {
  display: flex;
  align-items: center;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-menu a {
  padding: 8px 12px;
  border-radius: 7px;
  color: var(--text-2);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.15s, background 0.15s;
}
.nav-menu a:hover {
  color: var(--text);
  background: var(--bg-700);
}
.nav-cta {
  background: var(--amber);
  color: #0a0e14 !important;
  font-weight: 600 !important;
  margin-left: 6px;
}
.nav-cta:hover {
  background: var(--amber-soft);
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}
.nav-toggle-bar {
  width: 18px;
  height: 2px;
  background: var(--text);
  transition: transform 0.2s, opacity 0.2s;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 64px 0 72px;
  background:
    radial-gradient(ellipse 70% 55% at 70% 0%, rgba(255, 140, 66, 0.10), transparent 70%),
    radial-gradient(ellipse 50% 45% at 10% 30%, rgba(61, 214, 140, 0.06), transparent 70%),
    var(--bg-900);
  border-bottom: 1px solid var(--border-soft);
  overflow: hidden;
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(50, 64, 86, 0.18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(50, 64, 86, 0.18) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(ellipse 80% 60% at 60% 30%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 60% 30%, #000 30%, transparent 80%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 44px;
  align-items: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  padding: 6px 12px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: rgba(15, 20, 29, 0.6);
  color: var(--text-2);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
}
.eyebrow-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--phosphor);
  box-shadow: 0 0 8px var(--phosphor);
  animation: pulse 2.2s ease-in-out infinite;
}
.hero-title {
  margin: 0 0 18px;
  font-size: clamp(2.4rem, 6vw, 4.1rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  font-weight: 800;
}
.hero-title-accent {
  color: var(--amber);
  position: relative;
}
.hero-sub {
  margin: 0 0 30px;
  max-width: 34em;
  font-size: clamp(1rem, 1.6vw, 1.14rem);
  color: var(--text-2);
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 26px;
}
.hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-3);
}
.hero-trust li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.tick {
  color: var(--phosphor);
  font-weight: 700;
}

/* ---------- Hero 设备可视化 ---------- */
.hero-visual {
  position: relative;
}
.device {
  position: relative;
  background: linear-gradient(180deg, var(--bg-800), var(--bg-850));
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow), 0 0 0 1px rgba(255, 140, 66, 0.08) inset;
  overflow: hidden;
}
.device-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  background: var(--bg-800);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}
.led {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--text-4);
  box-shadow: inset 0 0 2px rgba(0, 0, 0, 0.5);
}
.led-on {
  background: var(--phosphor);
  box-shadow: 0 0 8px var(--phosphor);
  animation: pulse 2s ease-in-out infinite;
}
.device-meta {
  color: var(--text-3);
}
.device-spacer {
  flex: 1;
}
.device-badge {
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--phosphor);
  border: 1px solid rgba(61, 214, 140, 0.4);
  background: rgba(61, 214, 140, 0.08);
}
.device-screen {
  position: relative;
  padding: 16px;
  background:
    linear-gradient(180deg, var(--bg-900), #06080c);
  min-height: 240px;
}
.device-signals {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.sig {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 5px;
  border: 1px solid var(--border);
  color: var(--text-4);
  background: var(--bg-850);
}
.sig-on {
  color: var(--phosphor);
  border-color: rgba(61, 214, 140, 0.4);
  background: rgba(61, 214, 140, 0.08);
}
.device-log {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--phosphor-soft);
  white-space: pre-wrap;
  word-break: break-all;
  min-height: 150px;
}
.device-log .ts {
  color: var(--text-4);
  margin-right: 8px;
}
.device-log .dir {
  font-weight: 600;
  margin-right: 8px;
}
.device-log .rx .dir {
  color: var(--phosphor);
}
.device-log .rx {
  color: var(--phosphor-soft);
}
.device-log .tx {
  color: var(--amber-soft);
}
.device-log .tx .dir {
  color: var(--amber);
}
.device-cursor {
  display: inline-block;
  color: var(--phosphor);
  font-family: var(--font-mono);
  animation: blink 1s steps(1) infinite;
}
.device-foot {
  display: flex;
  gap: 18px;
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg-800);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-3);
}
.device-foot b {
  color: var(--text);
  font-weight: 600;
  margin-right: 3px;
}
/* 角标装饰 */
.corner {
  position: absolute;
  width: 14px;
  height: 14px;
  border-color: var(--amber);
  border-style: solid;
  border-width: 0;
  opacity: 0.7;
}
.corner-tl {
  top: 10px;
  left: 10px;
  border-top-width: 2px;
  border-left-width: 2px;
}
.corner-tr {
  top: 10px;
  right: 10px;
  border-top-width: 2px;
  border-right-width: 2px;
}
.corner-bl {
  bottom: 10px;
  left: 10px;
  border-bottom-width: 2px;
  border-left-width: 2px;
}
.corner-br {
  bottom: 10px;
  right: 10px;
  border-bottom-width: 2px;
  border-right-width: 2px;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}
@keyframes blink {
  0%, 50% { opacity: 1; }
  50.01%, 100% { opacity: 0; }
}

/* ---------- 信任条 ---------- */
.trust-strip {
  border-bottom: 1px solid var(--border-soft);
  background: var(--bg-850);
}
.trust-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  padding: 22px 20px;
}
.trust-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 0.88rem;
}
.trust-k {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--amber);
  padding: 2px 8px;
  border: 1px solid rgba(255, 140, 66, 0.3);
  border-radius: 5px;
  background: rgba(255, 140, 66, 0.06);
}
.trust-v {
  color: var(--text-2);
}

/* ---------- 通用区块 ---------- */
.section {
  padding: 84px 0;
  border-bottom: 1px solid var(--border-soft);
}
.section-head {
  max-width: 640px;
  margin: 0 0 48px;
}
.section-kicker {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0 0 12px;
}
.section-title {
  margin: 0 0 14px;
  font-size: clamp(1.7rem, 3.6vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.section-desc {
  margin: 0;
  font-size: 1.02rem;
  color: var(--text-2);
}

/* ---------- 功能卡片 ---------- */
.features {
  background: var(--bg-900);
}
.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.feature-card {
  position: relative;
  padding: 26px 24px 24px;
  background: linear-gradient(180deg, var(--bg-850), var(--bg-800));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform 0.18s ease, border-color 0.18s, box-shadow 0.18s;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle 200px at 80% -10%, rgba(255, 140, 66, 0.08), transparent 70%);
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}
.feature-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow);
}
.feature-card:hover::before {
  opacity: 1;
}
.feature-index {
  position: absolute;
  top: 18px;
  right: 20px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-4);
  letter-spacing: 0.1em;
}
.feature-icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 11px;
  background: linear-gradient(145deg, rgba(255, 140, 66, 0.16), rgba(255, 140, 66, 0.03));
  border: 1px solid rgba(255, 140, 66, 0.3);
  color: var(--amber);
  margin-bottom: 18px;
}
.feature-title {
  margin: 0 0 8px;
  font-size: 1.12rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.feature-text {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-2);
}

/* ---------- 工作原理 ---------- */
.how {
  background: var(--bg-850);
}
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  counter-reset: step;
}
.step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 18px;
  align-items: start;
  padding: 24px;
  background: var(--bg-800);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
}
.step-num {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: 12px;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--amber);
  background: rgba(255, 140, 66, 0.08);
  border: 1px solid rgba(255, 140, 66, 0.3);
}
.step-title {
  margin: 4px 0 6px;
  font-size: 1.12rem;
  font-weight: 600;
}
.step-text {
  margin: 0;
  color: var(--text-2);
  font-size: 0.93rem;
}
.how-cta {
  margin-top: 36px;
  text-align: center;
}

/* ---------- 应用场景 / 社会证明 ---------- */
.proof {
  background: var(--bg-900);
}
.stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 40px;
}
.stat {
  text-align: center;
  padding: 26px 16px;
  background: linear-gradient(180deg, var(--bg-850), var(--bg-800));
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  font-weight: 700;
  color: var(--amber);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label {
  font-size: 0.82rem;
  color: var(--text-3);
  letter-spacing: 0.02em;
}
.proof-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.usecases {
  display: grid;
  gap: 12px;
  padding: 26px;
  background: var(--bg-800);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.usecases li {
  display: grid;
  gap: 4px;
  font-size: 0.92rem;
  color: var(--text-2);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-soft);
}
.usecases li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}
.tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--phosphor);
  width: fit-content;
  padding: 2px 8px;
  border: 1px solid rgba(61, 214, 140, 0.3);
  border-radius: 5px;
  background: rgba(61, 214, 140, 0.06);
}
.quote {
  position: relative;
  margin: 0;
  padding: 30px 26px 24px;
  background: linear-gradient(180deg, var(--bg-850), var(--bg-800));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-glow-phosphor);
}
.quote-mark {
  position: absolute;
  top: 6px;
  left: 18px;
  font-family: var(--font-mono);
  font-size: 3.4rem;
  line-height: 1;
  color: var(--phosphor);
  opacity: 0.5;
}
.quote blockquote {
  margin: 18px 0 18px;
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--text);
}
.quote-by {
  display: flex;
  align-items: center;
  gap: 12px;
}
.quote-avatar {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--phosphor);
  background: rgba(61, 214, 140, 0.1);
  border: 1px solid rgba(61, 214, 140, 0.35);
}
.quote-by strong {
  display: block;
  font-size: 0.92rem;
}
.quote-by .muted {
  font-size: 0.8rem;
}

/* ---------- 最终 CTA ---------- */
.cta-band {
  padding: 84px 0;
  background:
    radial-gradient(ellipse 60% 80% at 50% 50%, rgba(255, 140, 66, 0.12), transparent 70%),
    var(--bg-900);
  border-bottom: 1px solid var(--border-soft);
  position: relative;
  overflow: hidden;
}
.cta-inner {
  position: relative;
  text-align: center;
}
.cta-grid {
  position: absolute;
  inset: -20% -20%;
  background-image:
    linear-gradient(rgba(50, 64, 86, 0.15) 1px, transparent 1px),
    linear-gradient(90deg, rgba(50, 64, 86, 0.15) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, #000 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, #000 20%, transparent 75%);
  pointer-events: none;
}
.cta-title {
  position: relative;
  margin: 0 0 14px;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.cta-sub {
  position: relative;
  margin: 0 0 28px;
  font-size: 1.05rem;
  color: var(--text-2);
}
.cta-btn {
  position: relative;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--bg-900);
  padding: 56px 0 28px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-soft);
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.footer-brand strong {
  font-size: 1.05rem;
}
.footer-brand p {
  margin: 2px 0 0;
  font-size: 0.85rem;
}
.footer-nav {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.footer-nav h4 {
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-3);
  margin: 0 0 14px;
  font-weight: 600;
}
.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-nav a {
  color: var(--text-2);
  font-size: 0.9rem;
  transition: color 0.15s;
}
.footer-nav a:hover {
  color: var(--amber);
}
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  padding-top: 22px;
  font-size: 0.8rem;
}

/* ---------- 滚动揭示 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* =========================================================
   响应式 · 移动优先断点
   ========================================================= */
@media (min-width: 640px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats {
    grid-template-columns: repeat(4, 1fr);
  }
  .proof-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
  .footer-nav {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 860px) {
  .hero {
    padding: 88px 0 96px;
  }
  .hero-inner {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
  }
  .trust-inner {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .steps {
    grid-template-columns: repeat(3, 1fr);
  }
  .footer-inner {
    grid-template-columns: 1fr 2fr;
  }
}

@media (min-width: 1100px) {
  .hero-inner {
    gap: 72px;
  }
}

/* 移动端导航折叠 */
@media (max-width: 760px) {
  .nav-toggle {
    display: flex;
  }
  .nav-menu {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px;
    background: var(--bg-850);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.2s, opacity 0.2s;
  }
  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-menu a {
    padding: 12px 14px;
    border-radius: 8px;
  }
  .nav-cta {
    text-align: center;
    margin: 4px 0 0;
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
  .section {
    padding: 64px 0;
  }
}