/* ============================================
   灵动创思 LingDong Creative — 全站样式
   白色 · 简约 · 大气
   ============================================ */

:root {
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --text: #111827;
  --text-2: #6b7280;
  --text-3: #9ca3af;
  --border: #e8eaee;
  --accent: #4f46e5;
  --accent-2: #7c3aed;
  --gradient: linear-gradient(135deg, #4f46e5, #7c3aed);
  --radius: 20px;
  --shadow-sm: 0 1px 3px rgba(17, 24, 39, 0.05);
  --shadow-md: 0 12px 32px rgba(17, 24, 39, 0.08);
  --shadow-lg: 0 30px 80px rgba(17, 24, 39, 0.10);
}

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

html { scroll-behavior: smooth; scroll-padding-top: 96px; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { text-decoration: none; color: inherit; }
img, svg { display: block; }
button { font-family: inherit; }

a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

::selection { background: rgba(79, 70, 229, 0.16); }

.container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }

/* ---------- 通用元素 ---------- */

.grad-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 5px;
  color: var(--accent);
  margin-bottom: 14px;
}

.section { padding: 104px 0; }
.section.alt { background: var(--bg-soft); }

.section-head { max-width: 660px; margin: 0 auto 60px; text-align: center; }
.section-head h2 {
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 800;
  letter-spacing: -0.3px;
  line-height: 1.28;
}
.section-head p { color: var(--text-2); margin-top: 14px; font-size: 16.5px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .25s ease, box-shadow .25s ease, background .25s ease, border-color .25s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 8px 20px rgba(79, 70, 229, .28);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 28px rgba(79, 70, 229, .36); }
.btn-ghost { background: #fff; border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: #c9cdd6; background: var(--bg-soft); transform: translateY(-2px); }
.btn-white { background: #fff; color: #111827; }
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(0, 0, 0, .3); }
.btn-outline-light { border-color: rgba(255, 255, 255, .35); color: #fff; background: transparent; }
.btn-outline-light:hover { border-color: rgba(255, 255, 255, .7); background: rgba(255, 255, 255, .06); }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #fff;
  font-size: 13.5px;
  color: var(--text-2);
  box-shadow: var(--shadow-sm);
}
.badge .spark { color: var(--accent); font-size: 14px; }

.icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: var(--accent);
  background: rgba(79, 70, 229, .08);
  margin-bottom: 20px;
  flex-shrink: 0;
}

/* ---------- 导航 ---------- */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, background .3s, box-shadow .3s;
}
.nav.scrolled {
  border-bottom-color: var(--border);
  background: rgba(255, 255, 255, .93);
  box-shadow: 0 4px 20px rgba(17, 24, 39, .04);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 20px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 11px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 1px;
  flex-shrink: 0;
}
.logo-mark {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--gradient);
  display: grid;
  place-items: center;
  color: #fff;
  box-shadow: 0 4px 12px rgba(79, 70, 229, .32);
  font-size: 17px;
  font-weight: 700;
}
.logo-en { font-size: 11px; color: var(--text-3); letter-spacing: 1px; font-weight: 500; display: block; line-height: 1.1; }
.logo-name { display: flex; flex-direction: column; justify-content: center; }

.nav-links { display: flex; align-items: center; gap: 4px; list-style: none; }
.nav-links a {
  padding: 9px 15px;
  border-radius: 9px;
  font-size: 15px;
  color: var(--text-2);
  transition: color .2s, background .2s;
  font-weight: 500;
}
.nav-links a:hover { color: var(--text); background: var(--bg-soft); }
.nav-links a.active { color: var(--text); font-weight: 600; }
.mobile-auth { display: none; }

.nav-actions { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.nav-actions .btn { padding: 9px 22px; font-size: 14px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 9px;
}
.nav-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: .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); }

/* ---------- 首页 Hero ---------- */

.hero { position: relative; padding: 168px 0 90px; overflow: hidden; }
.hero::before {
  content: "";
  position: absolute;
  top: -240px; right: -140px;
  width: 660px; height: 660px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79, 70, 229, .10), transparent 65%);
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  top: 140px; left: -220px;
  width: 540px; height: 540px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(124, 58, 237, .08), transparent 65%);
  pointer-events: none;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 64px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.hero h1 {
  font-size: clamp(38px, 5vw, 58px);
  line-height: 1.2;
  letter-spacing: -0.5px;
  font-weight: 800;
  margin: 24px 0 20px;
}
.hero-sub { font-size: 18px; color: var(--text-2); max-width: 520px; margin-bottom: 38px; }
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-note {
  margin-top: 26px;
  font-size: 13px;
  color: var(--text-3);
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
}

/* 模拟产品窗口 */
.hero-visual { position: relative; }
.window {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.window-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: #fafafb;
}
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot:nth-child(1) { background: #fca5a5; }
.dot:nth-child(2) { background: #fcd34d; }
.dot:nth-child(3) { background: #86efac; }
.window-title { margin-left: 10px; font-size: 12px; color: var(--text-3); letter-spacing: .5px; }
.window-body { padding: 24px; display: flex; flex-direction: column; gap: 14px; }
.msg { max-width: 90%; padding: 12px 16px; border-radius: 14px; font-size: 14px; line-height: 1.65; }
.msg.user { align-self: flex-end; background: var(--gradient); color: #fff; border-bottom-right-radius: 4px; }
.msg.ai { align-self: flex-start; background: var(--bg-soft); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.msg .chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.msg .chips span {
  font-size: 12px;
  padding: 5px 11px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--border);
  color: var(--text-2);
}
.typing { display: inline-flex; gap: 5px; padding: 15px 18px; }
.typing span { width: 7px; height: 7px; border-radius: 50%; background: #c3c8d2; animation: blink 1.2s infinite; }
.typing span:nth-child(2) { animation-delay: .2s; }
.typing span:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 0%, 80%, 100% { opacity: .25; } 40% { opacity: 1; } }

.float-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 9px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 600;
  box-shadow: 0 12px 32px rgba(17, 24, 39, .12);
  animation: floaty 5s ease-in-out infinite;
  white-space: nowrap;
}
.fc-icon { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; font-size: 12px; color: #fff; flex-shrink: 0; }
.fc-icon.ok { background: #10b981; }
.fc-icon.ai { background: var(--accent); }
.fc-icon.vd { background: #f59e0b; }
.fc-1 { top: -20px; right: -6px; }
.fc-2 { bottom: 42px; left: -28px; animation-delay: 1.2s; }
.fc-3 { bottom: -20px; right: 52px; animation-delay: 2.2s; }
@keyframes floaty { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

/* ---------- 数据条 ---------- */

.stats { padding: 10px 0 20px; }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.stat { padding: 36px 20px; text-align: center; border-left: 1px solid var(--border); }
.stat:first-child { border-left: 0; }
.stat-num { font-size: 40px; font-weight: 800; letter-spacing: -0.5px; line-height: 1.2; }
.stat-num small { font-size: 22px; font-weight: 800; }
.stat-label { font-size: 14px; color: var(--text-2); margin-top: 6px; }

/* ---------- 服务卡片 ---------- */

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 38px 32px;
  transition: transform .3s ease, box-shadow .3s ease;
  display: flex;
  flex-direction: column;
}
.section.alt .card { box-shadow: var(--shadow-sm); }
.card:hover { transform: translateY(-6px); box-shadow: 0 24px 48px rgba(17, 24, 39, .10); }
.card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.card > p { color: var(--text-2); font-size: 14.5px; flex: 1; }
.card .tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0 22px; }
.tag { font-size: 12px; color: var(--accent); background: rgba(79, 70, 229, .07); padding: 4px 11px; border-radius: 999px; }
.card-link { font-size: 14.5px; font-weight: 600; display: inline-flex; align-items: center; gap: 6px; }
.card-link .arr { transition: transform .25s; }
.card:hover .card-link { color: var(--accent); }
.card:hover .card-link .arr { transform: translateX(4px); }

/* ---------- 特性网格 ---------- */

.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature {
  padding: 30px 26px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: #fff;
  transition: transform .3s ease, box-shadow .3s ease;
}
.feature:hover { transform: translateY(-4px); box-shadow: 0 18px 40px rgba(17, 24, 39, .08); }
.feature .icon-wrap { width: 44px; height: 44px; margin-bottom: 16px; }
.feature h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.feature p { font-size: 14px; color: var(--text-2); }

/* ---------- 三步流程 ---------- */

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.step {
  position: relative;
  padding: 38px 30px;
  border-radius: 18px;
  background: #fff;
  border: 1px solid var(--border);
  text-align: center;
}
.step-num {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  font-weight: 700;
  display: grid;
  place-items: center;
  margin: 0 auto 18px;
  font-size: 18px;
  box-shadow: 0 8px 18px rgba(79, 70, 229, .28);
}
.step h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.step p { font-size: 14px; color: var(--text-2); }

/* ---------- CTA 横幅 ---------- */

.cta-banner {
  background: #0d1021;
  border-radius: 28px;
  padding: 80px 40px;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: "";
  position: absolute;
  top: -160px; left: 50%;
  transform: translateX(-50%);
  width: 700px; height: 400px;
  background: radial-gradient(ellipse, rgba(99, 91, 255, .35), transparent 70%);
  pointer-events: none;
}
.cta-banner > * { position: relative; }
.cta-banner h2 { font-size: clamp(26px, 3.2vw, 38px); font-weight: 800; letter-spacing: -0.3px; }
.cta-banner p { color: rgba(255, 255, 255, .62); margin: 16px 0 36px; font-size: 16.5px; }
.cta-banner .hero-cta { justify-content: center; }

/* ---------- 页脚 ---------- */

.footer { border-top: 1px solid var(--border); background: #fff; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  padding: 64px 0 52px;
}
.footer-brand p { color: var(--text-2); font-size: 14px; margin-top: 14px; max-width: 280px; }
.footer h4 { font-size: 14px; font-weight: 700; margin-bottom: 16px; letter-spacing: .5px; }
.footer-col a { display: block; color: var(--text-2); font-size: 14px; padding: 5px 0; transition: color .2s; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-3);
  font-size: 13px;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 子页面 Hero ---------- */

.page-hero { position: relative; padding: 170px 0 64px; text-align: center; overflow: hidden; }
.page-hero::before {
  content: "";
  position: absolute;
  top: -260px; left: 50%;
  transform: translateX(-50%);
  width: 760px; height: 520px;
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(79, 70, 229, .09), transparent 65%);
  pointer-events: none;
}
.page-hero > .container { position: relative; }
.page-hero h1 { font-size: clamp(32px, 4.4vw, 52px); font-weight: 800; letter-spacing: -0.5px; margin: 18px 0; line-height: 1.25; }
.page-hero .lead { max-width: 660px; margin: 0 auto; color: var(--text-2); font-size: 17.5px; }
.page-hero .hero-cta { justify-content: center; margin-top: 36px; }

/* ---------- 场景图文行 ---------- */

.scenario { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; padding: 48px 0; }
.scenario + .scenario { border-top: 1px dashed var(--border); }
.scenario h3 { font-size: 25px; font-weight: 700; margin-bottom: 14px; letter-spacing: -0.2px; }
.scenario > div > p { color: var(--text-2); }
.scenario ul { margin-top: 20px; list-style: none; }
.scenario li { padding: 7px 0 7px 32px; position: relative; color: var(--text-2); font-size: 15px; }
.scenario li::before {
  content: "✓";
  position: absolute;
  left: 0; top: 8px;
  width: 21px; height: 21px;
  border-radius: 50%;
  background: rgba(79, 70, 229, .09);
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  display: grid;
  place-items: center;
}
.scenario.reverse .scenario-visual { order: -1; }
.panel {
  border-radius: 24px;
  min-height: 340px;
  display: grid;
  place-items: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #eef1ff 0%, #f7efff 100%);
  border: 1px solid #e7e9f6;
}
.panel::before {
  content: "";
  position: absolute;
  width: 340px; height: 340px;
  border-radius: 50%;
  border: 1px solid rgba(79, 70, 229, .12);
}
.panel::after {
  content: "";
  position: absolute;
  width: 220px; height: 220px;
  border-radius: 50%;
  border: 1px solid rgba(79, 70, 229, .16);
}
.big-icon {
  width: 96px; height: 96px;
  border-radius: 26px;
  background: #fff;
  display: grid;
  place-items: center;
  color: var(--accent);
  box-shadow: 0 18px 44px rgba(79, 70, 229, .20);
  position: relative;
  z-index: 1;
}
.chip-stat {
  position: absolute;
  background: #fff;
  border-radius: 12px;
  padding: 12px 18px;
  box-shadow: 0 12px 30px rgba(17, 24, 39, .12);
  font-size: 13px;
  font-weight: 600;
  z-index: 1;
}
.chip-stat small { display: block; font-size: 11.5px; color: var(--text-3); font-weight: 500; }
.cs-1 { bottom: 26px; left: 26px; }
.cs-2 { top: 26px; right: 26px; }
.chip-stat b { font-size: 17px; color: var(--accent); }

/* ---------- FAQ ---------- */

.faq-list { max-width: 780px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 25px 4px;
  font-weight: 600;
  font-size: 16.5px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-icon {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--bg-soft);
  display: grid;
  place-items: center;
  font-size: 16px;
  color: var(--accent);
  transition: transform .3s;
  flex-shrink: 0;
}
.faq-item[open] .faq-icon { transform: rotate(45deg); }
.faq-item p { color: var(--text-2); padding: 0 4px 26px; max-width: 680px; font-size: 15px; }

/* ---------- 登录 / 注册 ---------- */

.auth {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 56px 20px;
  position: relative;
  overflow: hidden;
}
.auth::before {
  content: "";
  position: absolute;
  top: -200px; right: -120px;
  width: 560px; height: 560px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79, 70, 229, .10), transparent 65%);
}
.auth::after {
  content: "";
  position: absolute;
  bottom: -220px; left: -140px;
  width: 560px; height: 560px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(124, 58, 237, .08), transparent 65%);
}
.auth-box { position: relative; z-index: 1; width: 100%; max-width: 430px; }
.auth-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 42px 38px;
  box-shadow: var(--shadow-lg);
}
.auth-brand { text-align: center; margin-bottom: 30px; }
.auth-brand .logo { justify-content: center; }
.auth-brand .slogan { font-size: 13.5px; color: var(--text-3); margin-top: 8px; }

.auth-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--bg-soft);
  border-radius: 12px;
  padding: 4px;
  margin-bottom: 28px;
}
.auth-tab {
  border: 0;
  background: transparent;
  padding: 10px;
  border-radius: 9px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-2);
  cursor: pointer;
  transition: .2s;
}
.auth-tab.active { background: #fff; color: var(--text); box-shadow: 0 2px 8px rgba(17, 24, 39, .08); }

.auth-panel { display: none; }
.auth-panel.active { display: block; }

.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13.5px; font-weight: 600; margin-bottom: 7px; }
.input {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 15px;
  transition: .2s;
  background: #fff;
  color: var(--text);
  font-family: inherit;
}
.input::placeholder { color: #b3b9c4; }
.input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(79, 70, 229, .12); }

.form-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13.5px;
  margin: 2px 0 22px;
}
.form-row a { color: var(--accent); font-weight: 500; }
.check { display: flex; align-items: center; gap: 8px; font-size: 13.5px; color: var(--text-2); cursor: pointer; }
.check input { accent-color: var(--accent); width: 15px; height: 15px; cursor: pointer; }

.btn-block { width: 100%; padding: 14px; font-size: 15.5px; }

.divider { display: flex; align-items: center; gap: 14px; color: var(--text-3); font-size: 12.5px; margin: 26px 0 18px; }
.divider::before, .divider::after { content: ""; height: 1px; flex: 1; background: var(--border); }

.oauth { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.oauth button {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  transition: .2s;
  color: var(--text);
}
.oauth button:hover { background: var(--bg-soft); }

.auth-switch { text-align: center; font-size: 14px; color: var(--text-2); margin-top: 24px; }
.auth-switch a { color: var(--accent); font-weight: 600; }
.auth-foot { text-align: center; margin-top: 22px; font-size: 13.5px; }
.auth-foot a { color: var(--text-2); }
.auth-foot a:hover { color: var(--accent); }

/* ---------- Toast ---------- */

.toast {
  position: fixed;
  top: 26px;
  left: 50%;
  transform: translate(-50%, -90px);
  background: #111827;
  color: #fff;
  padding: 13px 24px;
  border-radius: 999px;
  font-size: 14px;
  box-shadow: 0 14px 34px rgba(0, 0, 0, .28);
  transition: transform .4s cubic-bezier(.2, .9, .3, 1.25), opacity .3s;
  z-index: 300;
  opacity: 0;
  display: flex;
  align-items: center;
  gap: 9px;
  max-width: calc(100vw - 40px);
}
.toast.show { transform: translate(-50%, 0); opacity: 1; }
.toast .t-ico { color: #6ee7b7; font-weight: 700; }

/* ---------- 入场动画 ---------- */

.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .1s; }
.reveal.d2 { transition-delay: .2s; }
.reveal.d3 { transition-delay: .3s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .float-card, .typing span { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */

@media (max-width: 1024px) {
  .hero { padding: 150px 0 80px; }
  .hero-grid { grid-template-columns: 1fr; gap: 70px; }
  .hero-copy { text-align: center; }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-cta { justify-content: center; }
  .hero-note { justify-content: center; }
  .hero-visual { max-width: 540px; margin: 0 auto; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: 0; }
  .stat:nth-child(n+3) { border-top: 1px solid var(--border); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .section { padding: 80px 0; }
  .nav-toggle { display: flex; }
  .nav-links {
    display: none;
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: 14px 24px 22px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 24px 40px rgba(17, 24, 39, .08);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 13px 12px; font-size: 16px; }
  .nav-links .mobile-auth { display: block; }
  .nav-links .mobile-auth a { color: var(--accent); font-weight: 600; }
  .nav-actions .btn-ghost { display: none; }
  .cards { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .scenario { grid-template-columns: 1fr; gap: 36px; padding: 40px 0; }
  .scenario.reverse .scenario-visual { order: 0; }
  .panel { min-height: 280px; }
}

@media (max-width: 640px) {
  .hero { padding: 136px 0 64px; }
  .hero h1 { font-size: 34px; }
  .features-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat { padding: 26px 12px; }
  .stat-num { font-size: 32px; }
  .cta-banner { padding: 60px 24px; border-radius: 22px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; padding: 48px 0 40px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .auth-card { padding: 32px 24px; }
  .float-card { font-size: 12px; padding: 8px 12px; }
  .fc-2 { left: -8px; }
  .fc-3 { right: 12px; }
}