/* ============================================================
   智构 ZGOD — 共享设计令牌与组件库
   唯一 Token 来源；组件只消费语义变量，不写裸色值。
   ============================================================ */

:root {
  color-scheme: light;

  /* 品牌色 */
  --color-primary: #1f63ff;
  --color-primary-hover: #0f4fe0;
  --color-primary-active: #0c3fb3;
  --color-primary-soft: #edf3ff;
  --color-accent: #17c3e6;
  --color-accent-soft: #e3f8fd;

  /* 中性色 */
  --color-ink: #0a1128;
  --color-ink-700: #141e3d;
  --color-text: #1d2736;
  --color-muted-text: #5c6b84;
  --color-background: #ffffff;
  --color-background-soft: #f4f7fe;
  --color-surface: #ffffff;
  --color-border: #e2e8f4;
  --color-focus: #1f63ff;

  /* 深色块上的文字 */
  --color-text-on-dark: #f3f7ff;
  --color-muted-on-dark: #9fb0d4;

  /* 字体 */
  --font-body: "PingFang SC", "Microsoft YaHei", "Segoe UI", -apple-system,
    BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --font-display: var(--font-body);
  --font-mono: "SF Mono", "JetBrains Mono", Consolas, Menlo, monospace;

  /* 间距 */
  --space-unit: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  /* 圆角 */
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* 层级阴影 */
  --shadow-sm: 0 1px 2px rgba(13, 27, 62, 0.06);
  --shadow-md: 0 10px 30px -12px rgba(13, 27, 62, 0.16);
  --shadow-lg: 0 24px 60px -20px rgba(10, 17, 40, 0.35);
  --shadow-primary: 0 12px 28px -10px rgba(31, 99, 255, 0.55);

  --content-width: 76rem;
  --header-height: 68px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100dvh;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-ink);
  line-height: 1.25;
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.01em;
}

p { margin: 0; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { margin: 0; padding: 0; list-style: none; }

button, input, select, textarea {
  font: inherit;
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: 1rem;
  transform: translateY(-220%);
  z-index: 200;
  background: var(--color-primary);
  color: #fff;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: transform 0.15s ease;
}
.skip-link:focus { transform: translateY(0); }

/* ============ 通用容器与区块 ============ */

.container {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.section { padding-block: var(--space-24); }
.section--soft { background: var(--color-background-soft); }
.section--tight { padding-block: var(--space-16); }

.section-head {
  max-width: 44rem;
  margin: 0 auto var(--space-12);
  text-align: center;
}
.section-head--left { margin-inline: 0; text-align: left; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  margin-bottom: var(--space-4);
}
.eyebrow::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
}
.eyebrow--on-dark { color: #bcd0ff; background: rgba(120, 160, 255, 0.14); }
.eyebrow--on-dark::before { background: var(--color-accent); }

.section-title {
  font-size: clamp(1.7rem, 1.1rem + 2vw, 2.5rem);
  margin-bottom: var(--space-4);
}
.section-sub {
  color: var(--color-muted-text);
  font-size: 1.05rem;
}

/* ============ 按钮 ============ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease,
    color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
  white-space: nowrap;
}
.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-primary);
}
.btn--primary:hover { background: var(--color-primary-hover); }
.btn--primary:active { background: var(--color-primary-active); transform: translateY(1px); }
.btn--secondary {
  background: #fff;
  color: var(--color-primary);
  border-color: #cdddff;
}
.btn--secondary:hover { background: var(--color-primary-soft); border-color: var(--color-primary); }
.btn--ghost {
  background: transparent;
  color: var(--color-ink);
}
.btn--ghost:hover { background: var(--color-background-soft); }
.btn--ghost-on-dark {
  background: transparent;
  color: var(--color-text-on-dark);
  border-color: rgba(180, 200, 240, 0.35);
}
.btn--ghost-on-dark:hover { background: rgba(255, 255, 255, 0.08); }
.btn--on-dark {
  background: #fff;
  color: var(--color-ink);
}
.btn--on-dark:hover { background: #eaf0ff; }
.btn--lg { padding: 1rem 2rem; font-size: 1rem; border-radius: var(--radius-md); }
.btn--block { width: 100%; }

.btn .arrow { transition: transform 0.15s ease; }
.btn:hover .arrow { transform: translateX(3px); }

.link-text {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--color-primary);
  font-weight: 600;
}
.link-text .arrow { transition: transform 0.15s ease; }
.link-text:hover .arrow { transform: translateX(3px); }

/* ============ 头部导航 ============ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-ink);
}
.brand-mark {
  width: 34px;
  height: 34px;
  flex: none;
  border-radius: 9px;
  object-fit: cover;
  box-shadow: 0 4px 12px rgba(21, 89, 238, 0.25);
}
.brand-name small {
  display: block;
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  color: var(--color-muted-text);
  font-weight: 600;
  line-height: 1;
  margin-top: 3px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}
.main-nav a {
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--color-text);
  padding-block: 0.4rem;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.main-nav a:hover { color: var(--color-primary); }
.main-nav a[aria-current="page"] {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.header-login {
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--color-text);
}
.header-login:hover { color: var(--color-primary); }

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: #fff;
  cursor: pointer;
  padding: 0;
  position: relative;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 20px;
  height: 2px;
  background: var(--color-ink);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle span { top: 50%; margin-top: -1px; }
.nav-toggle span::before { top: -7px; left: 0; transform: none; }
.nav-toggle span::after { top: 7px; left: 0; transform: none; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after { transform: translateY(-7px) rotate(-45deg); }

.mobile-nav {
  display: none;
  border-top: 1px solid var(--color-border);
  background: #fff;
  padding: var(--space-4) 1.5rem var(--space-6);
}
.mobile-nav.is-open { display: block; }
.mobile-nav a {
  display: block;
  padding: 0.85rem 0;
  font-size: 1rem;
  font-weight: 500;
  border-bottom: 1px solid var(--color-border);
}
.mobile-nav a:last-of-type { border-bottom: none; }
.mobile-nav .btn { margin-top: var(--space-4); }

/* ============ Hero ============ */

.hero {
  position: relative;
  color: var(--color-text-on-dark);
  background:
    radial-gradient(900px 460px at 82% -8%, rgba(31, 99, 255, 0.42), transparent 62%),
    radial-gradient(640px 380px at 8% 108%, rgba(23, 195, 230, 0.18), transparent 60%),
    linear-gradient(150deg, #0a1128 0%, #0d1838 52%, #0a1430 100%);
  overflow: hidden;
}
/* 蓝图网格：标志性元素，仅深色 Hero/CTA 使用 */
.hero::before,
.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(140, 175, 255, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 175, 255, 0.07) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 30%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 50% 30%, #000 30%, transparent 78%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
  gap: var(--space-12);
  align-items: center;
  padding-block: clamp(4rem, 3rem + 4vw, 6.5rem);
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.85rem;
  color: #c9d8fb;
  background: rgba(120, 160, 255, 0.12);
  border: 1px solid rgba(140, 175, 255, 0.28);
  border-radius: 999px;
  padding: 0.4rem 0.95rem;
  margin-bottom: var(--space-6);
}
.hero-badge .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(23, 195, 230, 0.2);
}
.hero h1 {
  color: #fff;
  font-size: clamp(2.1rem, 1.3rem + 3vw, 3.4rem);
  line-height: 1.18;
  margin-bottom: var(--space-6);
}
.hero h1 .grad {
  background: linear-gradient(92deg, #6ea0ff 0%, #36d4ee 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-lead {
  color: var(--color-muted-on-dark);
  font-size: 1.12rem;
  max-width: 34rem;
  margin-bottom: var(--space-8);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-10);
}
.hero-proof {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6) var(--space-10);
}
.hero-proof .item { display: flex; flex-direction: column; }
.hero-proof .num {
  font-family: var(--font-mono);
  font-size: 1.55rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
}
.hero-proof .lbl { font-size: 0.85rem; color: var(--color-muted-on-dark); }

.hero-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(140, 175, 255, 0.24);
  box-shadow: var(--shadow-lg);
  transform: rotate(0.6deg);
}
.hero-visual img { width: 100%; height: 100%; object-fit: cover; }
.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(10, 17, 40, 0.5));
}
.hero-visual-tag {
  position: absolute;
  left: var(--space-5);
  bottom: var(--space-5);
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: #e8f0ff;
  background: rgba(10, 17, 40, 0.55);
  border: 1px solid rgba(140, 175, 255, 0.3);
  backdrop-filter: blur(8px);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
}

/* ============ 通用卡片网格 ============ */

.grid { display: grid; gap: var(--space-6); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-sm);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #cdddff;
}
.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  margin-bottom: var(--space-5);
}
.card h3 { font-size: 1.18rem; margin-bottom: var(--space-3); }
.card p { color: var(--color-muted-text); font-size: 0.96rem; }
.card .card-foot { margin-top: var(--space-5); }

/* ============ 能力点列表 ============ */

.feature-list { display: grid; gap: var(--space-3); margin-top: var(--space-5); }
.feature-list li {
  position: relative;
  padding-left: 1.7rem;
  font-size: 0.93rem;
  color: var(--color-text);
}
.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--color-primary-soft);
  border: 2px solid var(--color-primary);
}
.feature-list--accent li::before {
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
}

/* ============ AI × 专家 对比带 ============ */

.duo {
  display: grid;
  grid-template-columns: 1fr 72px 1fr;
  gap: var(--space-6);
  align-items: stretch;
}
.duo-card {
  border-radius: var(--radius-lg);
  padding: var(--space-10);
  border: 1px solid var(--color-border);
}
.duo-card--ai {
  background: linear-gradient(160deg, #f0f6ff 0%, #ffffff 70%);
}
.duo-card--expert {
  background: linear-gradient(160deg, #0d1838 0%, #141e3d 100%);
  border-color: transparent;
  color: var(--color-text-on-dark);
}
.duo-card--expert h3,
.duo-card--expert .duo-role { color: #fff; }
.duo-card--expert p,
.duo-card--expert .feature-list li { color: var(--color-muted-on-dark); }
.duo-role {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}
.duo-card h3 { font-size: 1.35rem; margin-bottom: var(--space-4); }
.duo-x {
  align-self: center;
  justify-self: center;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-primary);
  z-index: 1;
}

/* ============ 步骤流程（首页预览 + 流程页） ============ */

.steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-4);
  counter-reset: step;
}
.step {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6) var(--space-5);
  box-shadow: var(--shadow-sm);
}
.step-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: 999px;
  width: 2.3rem;
  height: 2.3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
}
.step h4 { font-size: 1rem; margin-bottom: 0.4rem; }
.step p { font-size: 0.86rem; color: var(--color-muted-text); }
.step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 1.75rem;
  right: calc(var(--space-4) * -1 - 5px);
  width: 10px;
  height: 10px;
  border-top: 2px solid var(--color-primary);
  border-right: 2px solid var(--color-primary);
  transform: rotate(45deg);
}

/* 流程页纵向时间线 */
.timeline { position: relative; max-width: 56rem; margin: 0 auto; }
.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--space-8);
  padding: 0 0 var(--space-12) 0;
}
.timeline-item:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 99px;
  top: 3.4rem;
  bottom: -0.5rem;
  width: 2px;
  background: linear-gradient(var(--color-primary), var(--color-accent));
  opacity: 0.35;
}
.timeline-aside { text-align: right; padding-top: 0.3rem; }
.timeline-node {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  box-shadow: 0 0 0 6px var(--color-primary-soft);
  margin-bottom: var(--space-3);
}
.timeline-step-label {
  font-size: 0.82rem;
  color: var(--color-muted-text);
  font-weight: 500;
}
.timeline-body {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-sm);
}
.timeline-body h3 { font-size: 1.3rem; margin-bottom: var(--space-3); }
.timeline-body > p { color: var(--color-muted-text); margin-bottom: var(--space-5); }
.deliverable {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.deliverable span {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
}

/* ============ 案例 ============ */

.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.case-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.case-media { aspect-ratio: 4 / 3; overflow: hidden; background: var(--color-background-soft); }
.case-media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.3s ease; }
.case-card:hover .case-media img { transform: scale(1.04); }
.case-body { padding: var(--space-6); display: flex; flex-direction: column; gap: var(--space-3); flex: 1; }
.case-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.case-tags span {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: 999px;
  padding: 0.22rem 0.65rem;
}
.case-body h3 { font-size: 1.12rem; }
.case-body p { font-size: 0.9rem; color: var(--color-muted-text); flex: 1; }
.case-spec {
  border-top: 1px dashed var(--color-border);
  padding-top: var(--space-4);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}
.case-spec dt { font-size: 0.75rem; color: var(--color-muted-text); }
.case-spec dd { margin: 0; font-size: 0.88rem; font-weight: 600; color: var(--color-ink); }
.real-badge {
  font-size: 0.72rem;
  font-weight: 600;
  color: #0a7d5c;
  background: #dcf7ee;
  border-radius: 999px;
  padding: 0.22rem 0.65rem;
}

/* 案例页详情块 */
.case-feature {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-12);
  align-items: center;
  margin-bottom: var(--space-16);
}
.case-feature:nth-child(even) .case-feature-media { order: 2; }
.case-feature-media img {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
}
.case-feature h2 { font-size: 1.7rem; margin: var(--space-4) 0 var(--space-3); }
.case-feature > div > p { color: var(--color-muted-text); margin-bottom: var(--space-5); }

/* ============ 数字/指标带 ============ */

.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}
.metric {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  border-radius: var(--radius-md);
  background: rgba(120, 160, 255, 0.08);
  border: 1px solid rgba(140, 175, 255, 0.2);
}
.metric .num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
}
.metric .lbl { font-size: 0.86rem; color: var(--color-muted-on-dark); margin-top: 0.25rem; }

/* ============ 深色 CTA 带 ============ */

.cta-band {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(700px 320px at 88% 120%, rgba(23, 195, 230, 0.22), transparent 60%),
    linear-gradient(150deg, #0a1128, #10204a);
  color: var(--color-text-on-dark);
}
.cta-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  padding-block: var(--space-12);
  flex-wrap: wrap;
}
.cta-inner h2 { color: #fff; font-size: clamp(1.5rem, 1.1rem + 1.6vw, 2.1rem); margin-bottom: var(--space-3); }
.cta-inner p { color: var(--color-muted-on-dark); max-width: 34rem; }
.cta-actions { display: flex; flex-direction: column; gap: var(--space-3); align-items: flex-start; }
.cta-note { font-size: 0.8rem; color: var(--color-muted-on-dark); }

/* ============ 内页页头 ============ */

.page-hero {
  background:
    radial-gradient(800px 300px at 85% -40%, rgba(31, 99, 255, 0.28), transparent 60%),
    linear-gradient(150deg, #0a1128, #0d1838);
  color: var(--color-text-on-dark);
  padding-block: clamp(3.2rem, 2.4rem + 2.4vw, 5rem);
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(140, 175, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 175, 255, 0.06) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: linear-gradient(180deg, #000, transparent);
  -webkit-mask-image: linear-gradient(180deg, #000, transparent);
}
.page-hero .container { position: relative; }
.page-hero h1 {
  color: #fff;
  font-size: clamp(1.9rem, 1.3rem + 2.2vw, 2.8rem);
  margin-bottom: var(--space-4);
  max-width: 46rem;
}
.page-hero p { color: var(--color-muted-on-dark); font-size: 1.08rem; max-width: 42rem; }

/* ============ 服务页 ============ */

.service-detail {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: var(--space-12);
  align-items: start;
  padding-block: var(--space-16);
}
.service-detail + .service-detail { border-top: 1px solid var(--color-border); }
.service-detail--flip .service-visual { order: -1; }
.service-visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  background: var(--color-background-soft);
}
.service-visual img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.service-kicker {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}
.service-detail h2 { font-size: 1.7rem; margin-bottom: var(--space-4); }
.service-detail > div > p { color: var(--color-muted-text); margin-bottom: var(--space-5); }
.deliverable-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  margin: var(--space-5) 0;
}
.deliverable-grid li {
  background: var(--color-background-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-4) var(--space-5);
  font-size: 0.9rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.deliverable-grid li::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 2px;
  background: var(--color-primary);
  flex: none;
}
.price-chip {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  background: var(--color-primary-soft);
  border-radius: var(--radius-sm);
  padding: 0.6rem 1rem;
  font-size: 0.92rem;
  color: var(--color-primary-active);
  font-weight: 600;
}
.price-chip .num { font-family: var(--font-mono); font-size: 1.15rem; }

/* 积分说明卡 */
.points-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.point-card {
  text-align: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8) var(--space-6);
}
.point-card .point-num {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--color-primary);
}
.point-card h3 { font-size: 1.05rem; margin: var(--space-3) 0 var(--space-2); }
.point-card p { font-size: 0.88rem; color: var(--color-muted-text); }

/* ============ FAQ ============ */

.faq { max-width: 52rem; margin: 0 auto; display: grid; gap: var(--space-3); }
.faq details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  padding: 0 var(--space-6);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.faq details[open] { border-color: #cdddff; box-shadow: var(--shadow-sm); }
.faq summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) 0;
  font-weight: 600;
  color: var(--color-ink);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "";
  width: 10px; height: 10px;
  border-right: 2px solid var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
  flex: none;
  margin-top: -4px;
}
.faq details[open] summary::after { transform: rotate(-135deg); margin-top: 2px; }
.faq .faq-a {
  color: var(--color-muted-text);
  font-size: 0.95rem;
  padding-bottom: var(--space-5);
}

/* ============ 关于页 ============ */

.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.value-card {
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}
.value-card .num {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--color-accent);
  font-weight: 700;
  margin-bottom: var(--space-4);
}
.value-card h3 { font-size: 1.15rem; margin-bottom: var(--space-3); }
.value-card p { font-size: 0.93rem; color: var(--color-muted-text); }

.expert-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
}
.expert-item {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}
.expert-avatar {
  width: 56px; height: 56px;
  border-radius: 50%;
  margin: 0 auto var(--space-3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 1.05rem;
}
.expert-item h4 { font-size: 0.98rem; margin-bottom: 2px; }
.expert-item p { font-size: 0.82rem; color: var(--color-muted-text); }

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: var(--space-12);
  align-items: start;
}
.contact-info li {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--color-border);
}
.contact-info li:last-child { border-bottom: none; }
.contact-info .ci-icon {
  width: 42px; height: 42px;
  flex: none;
  border-radius: var(--radius-sm);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}
.contact-info h4 { font-size: 0.98rem; margin-bottom: 2px; }
.contact-info p { font-size: 0.9rem; color: var(--color-muted-text); }

.form-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-10);
  box-shadow: var(--shadow-sm);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); }
.form-field { margin-bottom: var(--space-5); }
.form-field label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 0.45rem;
  color: var(--color-ink);
}
.form-field label .req { color: var(--color-primary); }
.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.95rem;
  font-size: 0.95rem;
  color: var(--color-text);
  background: #fff;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(31, 99, 255, 0.14);
}
.form-field textarea { resize: vertical; min-height: 120px; }
.form-success {
  text-align: center;
  padding: var(--space-10) var(--space-6);
}
.form-success .check {
  width: 64px; height: 64px;
  margin: 0 auto var(--space-5);
  border-radius: 50%;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}
.form-success h3 { margin-bottom: var(--space-3); }
.form-success p { color: var(--color-muted-text); }
[hidden] { display: none !important; }

/* ============ Footer ============ */

.site-footer {
  background: #0a1128;
  color: var(--color-muted-on-dark);
  padding-top: var(--space-16);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: var(--space-10);
  padding-bottom: var(--space-12);
}
.footer-brand .brand { color: #fff; margin-bottom: var(--space-4); }
.footer-brand .brand-name small { color: #7d8db3; }
.footer-brand p { font-size: 0.9rem; max-width: 22rem; }
.footer-col h4 {
  color: #fff;
  font-size: 0.92rem;
  margin-bottom: var(--space-5);
}
.footer-col li { margin-bottom: var(--space-3); }
.footer-col a {
  font-size: 0.9rem;
  color: var(--color-muted-on-dark);
  transition: color 0.15s ease;
}
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(140, 175, 255, 0.16);
  padding-block: var(--space-6);
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  font-size: 0.84rem;
  color: #7d8db3;
}
.footer-credentials {
  border-top: 1px solid rgba(140, 175, 255, 0.1);
  padding-block: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.76rem;
  line-height: 1.7;
  color: #6d7ea6;
}
.footer-credentials .cred-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
}
.footer-credentials .cred-row span { white-space: nowrap; }
.footer-credentials a {
  color: #8fa3cf;
  transition: color 0.15s ease;
}
.footer-credentials a:hover { color: #fff; }
.footer-bottom + .footer-credentials { border-top: none; padding-top: 0; }

/* ============ 进场动效（克制、可被 reduce motion 关闭） ============ */

@keyframes riseIn {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero-copy > *, .hero-visual { animation: riseIn 0.7s cubic-bezier(0.22, 0.61, 0.36, 1) both; }
.hero-copy > *:nth-child(2) { animation-delay: 0.06s; }
.hero-copy > *:nth-child(3) { animation-delay: 0.12s; }
.hero-copy > *:nth-child(4) { animation-delay: 0.18s; }
.hero-copy > *:nth-child(5) { animation-delay: 0.24s; }
.hero-visual { animation-delay: 0.15s; }

/* ============ 响应式 ============ */

@media (max-width: 1024px) {
  .grid-3, .case-grid, .points-grid, .value-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .step:nth-child(3)::after { display: none; }
  .metrics, .expert-strip { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-8) var(--space-10); }
  .service-detail, .case-feature, .contact-layout { gap: var(--space-8); }
}

@media (max-width: 820px) {
  :root { --header-height: 60px; }
  .main-nav, .header-actions .header-login, .header-actions .btn { display: none; }
  .nav-toggle { display: block; }

  .hero-inner { grid-template-columns: 1fr; gap: var(--space-10); }
  .hero-visual { transform: none; order: -1; }
  .hero-proof { gap: var(--space-5) var(--space-8); }

  .duo { grid-template-columns: 1fr; }
  .duo-x { margin: calc(var(--space-3) * -1) auto; }

  .steps { grid-template-columns: 1fr; }
  .step:not(:last-child)::after { display: none; }

  .grid-3, .grid-2, .case-grid, .points-grid, .value-grid,
  .service-detail, .case-feature, .contact-layout {
    grid-template-columns: 1fr;
  }
  .service-detail--flip .service-visual,
  .case-feature--flip .case-feature-media { order: 0; }

  .timeline-item { grid-template-columns: 1fr; gap: var(--space-4); padding-left: 0; }
  .timeline-aside { text-align: left; display: flex; align-items: center; gap: var(--space-4); }
  .timeline-item:not(:last-child)::before {
    left: 27px;
    top: 4rem;
    bottom: -1rem;
  }

  .section { padding-block: var(--space-16); }
  .form-card { padding: var(--space-8) var(--space-6); }
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-8); }
  .cta-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 560px) {
  .container { padding-inline: 1.1rem; }
  .hero-actions .btn, .hero-actions a { width: 100%; }
  .metrics, .expert-strip, .deliverable-grid, .form-row { grid-template-columns: 1fr; }
  .card, .duo-card, .timeline-body { padding: var(--space-6); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}