/* ==========================================================================
   WebCo 官网首页 · 深色科技风样式
   说明：原生 CSS，无框架；深蓝黑底 + 黄/蓝/绿点缀（与生产看板视觉统一）。
   目录：
   1. 变量与基础
   2. 通用组件（按钮、区块标题）
   3. 顶部导航
   4. Hero
   5. 服务介绍
   6. 看板演示区（深色卡片式，还原真实看板）
   7. 案例
   8. 服务流程
   9. 常见问题 FAQ
   10. 联系我们
   11. 页脚
   12. 响应式
   ========================================================================== */

/* ---------- 1. 变量与基础 ---------- */
:root {
  --bg: #0a1626;          /* 页面主体 */
  --bg-deep: #081320;     /* Hero / 深色区块 */
  --bg-panel: #0e1f33;    /* 交替区块 / 面板 */
  --bg-card: #12273f;     /* 卡片 */
  --bg-input: #0a1a2c;    /* 输入框 */
  --line: #1d3a5c;        /* 边框 */
  --text: #e8eef5;        /* 主文字 */
  --text-muted: #8fa3ba;  /* 次级文字 */
  --primary: #f5d742;     /* 主强调（黄） */
  --primary-hover: #ffe066;
  --primary-dark: #d4b92e;
  --accent-blue: #4da3ff; /* 辅助强调（蓝） */
  --ok: #2ecc9f;
  --warn: #ff7a45;
  --danger: #ff4d6d;
  --footer-bg: #060d18;
  --footer-text: #8fa3ba;
  --radius: 10px;
  --shadow: 0 2px 6px rgba(0, 0, 0, 0.3), 0 10px 28px rgba(0, 0, 0, 0.28);
  --font-family: -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: Consolas, "Roboto Mono", "Courier New", monospace;
}

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

html {
  scroll-behavior: smooth;
}

/* 锚点跳转时避免被吸顶导航遮挡 */
section[id] {
  scroll-margin-top: 76px;
}

body {
  font-family: var(--font-family);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  vertical-align: middle;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

/* 键盘焦点可见性（无障碍） */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

::selection {
  background: rgba(245, 215, 66, 0.3);
}

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

.container-narrow {
  max-width: 820px;
}

/* ---------- 2. 通用组件 ---------- */

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  text-align: center;
  border: 1px solid transparent;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn-primary {
  background: var(--primary);
  color: #0b1a2e;
}

.btn-primary:hover {
  background: var(--primary-hover);
  color: #0b1a2e;
}

.btn-outline {
  border-color: var(--primary);
  color: var(--primary);
  background: transparent;
}

.btn-outline:hover {
  background: rgba(245, 215, 66, 0.1);
}

.btn-block {
  width: 100%;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 14px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--primary);
}

.section {
  padding: 84px 0;
}

.section-soft {
  background: var(--bg-panel);
}

.section-title {
  font-size: 32px;
  line-height: 1.35;
  font-weight: 700;
  margin-bottom: 14px;
  color: #fff;
}

.section-sub {
  font-size: 17px;
  color: var(--text-muted);
  max-width: 640px;
  margin-bottom: 48px;
}

/* ---------- 3. 顶部导航 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 22, 38, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(6px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  font-size: 18px;
  white-space: nowrap;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--primary);
  color: #0b1a2e;
  font-size: 18px;
  font-weight: 700;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.primary-nav a {
  color: var(--text);
  font-size: 15px;
  transition: color 0.15s ease;
}

.primary-nav a:hover {
  color: var(--primary);
}

.primary-nav a.is-active {
  color: var(--primary);
}

.primary-nav .nav-cta {
  margin-left: 6px;
  padding: 9px 20px;
  border-radius: 8px;
  background: var(--primary);
  color: #0b1a2e;
  font-weight: 600;
}

.primary-nav .nav-cta:hover {
  background: var(--primary-hover);
  color: #0b1a2e;
}

/* 汉堡按钮（默认隐藏，移动端显示） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
}

.nav-toggle-line {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

body.nav-open .nav-toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

body.nav-open .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

body.nav-open .nav-toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 4. Hero ---------- */

.hero {
  background: var(--bg-deep);
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

/* 左上角克制的蓝色光晕（仅一处，避免炫技） */
.hero::before {
  content: '';
  position: absolute;
  left: -120px;
  top: -120px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(77, 163, 255, 0.12) 0%, transparent 65%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
  padding-top: 72px;
  padding-bottom: 88px;
}

.hero-title {
  font-size: 40px;
  line-height: 1.3;
  font-weight: 800;
  margin-bottom: 20px;
  color: #fff;
}

.hero-lead {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 560px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  font-size: 14px;
  color: var(--text-muted);
}

.hero-points li::before {
  content: "✓";
  color: var(--ok);
  font-weight: 700;
  margin-right: 6px;
}

/* Hero 右侧示意卡片（深色看板风格） */
.hero-visual {
  position: relative;
  min-height: 320px;
}

.mock-card {
  position: absolute;
  border-radius: 12px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.mock-card-back {
  top: 34px;
  left: 10%;
  right: 4%;
  bottom: 8px;
  background: var(--bg-panel);
  border-color: var(--line);
  transform: rotate(-3deg);
}

.mock-card-front {
  top: 0;
  left: 18%;
  right: 0;
  padding: 18px 20px 14px;
  transform: rotate(1.5deg);
}

.mock-card-head {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.mock-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #d7dde6;
}

.mock-dot:nth-child(1) {
  background: #e5b7ab;
}

.mock-dot:nth-child(2) {
  background: #e8cf9f;
}

.mock-dot:nth-child(3) {
  background: #a8c9a9;
}

.mock-title {
  margin-left: 8px;
  font-size: 12px;
  color: var(--text-muted);
}

.mock-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.mock-label {
  font-size: 13px;
  color: var(--text);
}

.mock-tag {
  font-size: 11px;
  padding: 3px 9px;
  border-radius: 20px;
  font-weight: 600;
}

.mock-tag-high {
  background: rgba(255, 77, 109, 0.15);
  color: var(--danger);
  border: 1px solid rgba(255, 77, 109, 0.4);
}

.mock-tag-run {
  background: rgba(46, 204, 159, 0.15);
  color: var(--ok);
  border: 1px solid rgba(46, 204, 159, 0.4);
}

.mock-progress {
  height: 8px;
  border-radius: 8px;
  background: #0a1a2c;
  border: 1px solid var(--line);
  margin: 4px 0 14px;
  overflow: hidden;
}

.mock-progress-fill {
  display: block;
  height: 100%;
  border-radius: 8px;
  background: linear-gradient(90deg, var(--accent-blue), var(--ok), var(--primary));
}

.mock-card-foot {
  margin-top: 8px;
  font-size: 11px;
  color: #61738c;
  text-align: right;
}

/* ---------- 5. 服务介绍 ---------- */

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 56px;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.service-card:hover {
  transform: translateY(-3px);
  border-color: rgba(245, 215, 66, 0.5);
}

.service-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: 18px;
  border-radius: 10px;
  background: rgba(77, 163, 255, 0.12);
  color: var(--accent-blue);
  border: 1px solid rgba(77, 163, 255, 0.3);
}

.service-icon svg {
  width: 26px;
  height: 26px;
}

.service-card h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 10px;
  color: #fff;
}

.service-card p {
  font-size: 14.5px;
  color: var(--text-muted);
}

/* 适合哪些客户 */
.clients {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 36px;
}

.clients-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 18px;
  color: #fff;
}

.client-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 16px;
}

.client-list li {
  padding: 8px 18px;
  border-radius: 30px;
  background: rgba(77, 163, 255, 0.12);
  color: var(--accent-blue);
  border: 1px solid rgba(77, 163, 255, 0.3);
  font-size: 14.5px;
  font-weight: 600;
}

/* ---------- 6. 看板演示区（深色卡片式） ---------- */

.dashboard-demo {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
  margin-bottom: 36px;
}

.demo-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 22px;
  background: linear-gradient(180deg, #0d2036 0%, #0a1828 100%);
  border-bottom: 1px solid var(--line);
}

.demo-bar-title {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 1px;
}

.demo-bar-note {
  font-size: 12.5px;
  color: var(--primary);
  padding: 3px 10px;
  border-radius: 20px;
  background: rgba(245, 215, 66, 0.1);
  border: 1px solid rgba(245, 215, 66, 0.35);
}

.demo-bar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.demo-link {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--accent-blue);
  padding: 3px 12px;
  border-radius: 20px;
  background: rgba(77, 163, 255, 0.12);
  border: 1px solid rgba(77, 163, 255, 0.4);
  transition: border-color 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}

.demo-link:hover {
  border-color: var(--accent-blue);
  color: #fff;
}

/* 订单卡片网格 */
.demo-orders {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding: 16px 20px;
}

.demo-order-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color 0.15s ease;
}

.demo-order-card:hover {
  border-color: rgba(245, 215, 66, 0.5);
}

.demo-order-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.demo-order-id {
  font-size: 1rem;
  font-weight: 900;
  color: var(--primary);
  font-family: var(--mono);
  letter-spacing: 1px;
}

.demo-order-meta {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 0.7rem;
  color: var(--text-muted);
}

.demo-order-progress {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  background: rgba(245, 215, 66, 0.06);
  border: 1px solid rgba(245, 215, 66, 0.25);
  border-radius: 8px;
  padding: 5px 10px;
}

.demo-pass {
  font-size: 0.8rem;
  font-weight: 900;
  color: var(--primary);
  white-space: nowrap;
}

.demo-process {
  background: var(--primary);
  color: #0b1a2e;
  font-weight: 800;
  padding: 2px 10px;
  border-radius: 6px;
  font-size: 0.75rem;
  letter-spacing: 1px;
  white-space: nowrap;
}

/* 进度条（复用 tag 的进度条类） */
.progress {
  display: block;
  height: 6px;
  border-radius: 4px;
  background: #0a1a2c;
  border: 1px solid var(--line);
  overflow: hidden;
}

.progress-fill {
  display: block;
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--accent-blue), var(--ok), var(--primary));
}

.demo-order-countdown {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 4px 10px;
  border-radius: 8px;
  font-size: 0.7rem;
  color: #fff;
  background: rgba(255, 122, 69, 0.08);
  border: 1px solid rgba(255, 122, 69, 0.3);
}

.demo-order-countdown.normal {
  background: rgba(46, 204, 159, 0.08);
  border-color: rgba(46, 204, 159, 0.3);
  color: var(--ok);
}

.demo-order-countdown.warn {
  background: rgba(245, 215, 66, 0.12);
  border-color: rgba(245, 215, 66, 0.6);
  color: var(--primary);
}

.demo-order-countdown.danger {
  background: rgba(255, 77, 109, 0.1);
  border-color: rgba(255, 77, 109, 0.45);
  color: var(--danger);
}

.demo-order-countdown .cd {
  font-family: var(--mono);
  font-weight: 700;
}

/* 状态标签（通用） */
.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.tag-high {
  background: rgba(255, 77, 109, 0.15);
  color: var(--danger);
  border: 1px solid rgba(255, 77, 109, 0.4);
}

.tag-mid {
  background: rgba(255, 122, 69, 0.15);
  color: var(--warn);
  border: 1px solid rgba(255, 122, 69, 0.4);
}

.tag-low {
  background: rgba(143, 163, 186, 0.15);
  color: var(--text-muted);
  border: 1px solid rgba(143, 163, 186, 0.35);
}

.tag-run {
  background: rgba(77, 163, 255, 0.15);
  color: var(--accent-blue);
  border: 1px solid rgba(77, 163, 255, 0.4);
}

.tag-done {
  background: rgba(46, 204, 159, 0.15);
  color: var(--ok);
  border: 1px solid rgba(46, 204, 159, 0.4);
}

.tag-wait {
  background: rgba(143, 163, 186, 0.15);
  color: var(--text-muted);
  border: 1px solid rgba(143, 163, 186, 0.35);
}

.demo-note {
  padding: 12px 22px 16px;
  font-size: 13px;
  color: var(--text-muted);
  border-top: 1px solid var(--line);
  background: rgba(10, 26, 44, 0.5);
}

/* 看板能力点 */
.feature-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.feature-list li {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--accent-blue);
}

/* ---------- 7. 案例 ---------- */

.case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.case-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.case-thumb {
  height: 190px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.placeholder-thumb {
  background: repeating-linear-gradient(
    45deg,
    #0e2238,
    #0e2238 14px,
    #132a45 14px,
    #132a45 28px
  );
  border-bottom: 1px solid var(--line);
}

.case-body {
  padding: 22px 24px 26px;
}

.case-body h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 6px;
  color: #fff;
}

.case-status {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 13px;
  font-weight: 600;
  color: var(--warn);
  background: rgba(255, 122, 69, 0.12);
  border: 1px solid rgba(255, 122, 69, 0.35);
  padding: 3px 11px;
  border-radius: 20px;
}

.case-status-ok {
  background: rgba(46, 204, 159, 0.12);
  color: var(--ok);
  border: 1px solid rgba(46, 204, 159, 0.35);
}

.case-note {
  margin-top: 18px;
  font-size: 13px;
  color: var(--text-muted);
}

/* 案例缩略图：纯 CSS 微型示意图 */
.case-thumb {
  background: linear-gradient(180deg, #0d2036 0%, #0a1828 100%);
}

.case-thumb-website,
.case-thumb-kanban {
  padding: 20px;
}

/* 迷你浏览器（官网案例） */
.mini-browser {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  width: 100%;
  max-width: 260px;
  margin: 0 auto;
  box-shadow: var(--shadow);
}

.mini-browser-bar {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 7px 10px;
  background: rgba(10, 26, 44, 0.6);
  border-bottom: 1px solid var(--line);
}

.mini-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #d7dde6;
}

.mini-dot:nth-child(1) {
  background: #e5b7ab;
}

.mini-dot:nth-child(2) {
  background: #e8cf9f;
}

.mini-dot:nth-child(3) {
  background: #a8c9a9;
}

.mini-url {
  flex: 1;
  height: 10px;
  margin-left: 4px;
  border-radius: 4px;
  background: rgba(143, 163, 186, 0.2);
}

.mini-browser-body {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mini-line {
  height: 7px;
  border-radius: 4px;
  background: rgba(77, 163, 255, 0.25);
}

.mini-line.w40 {
  width: 40%;
}

.mini-line.w60 {
  width: 60%;
}

.mini-line.w80 {
  width: 80%;
}

.mini-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin-top: 4px;
}

.mini-card {
  height: 34px;
  border-radius: 5px;
  background: rgba(143, 163, 186, 0.12);
  border: 1px solid rgba(143, 163, 186, 0.2);
}

/* 迷你看板卡片（看板案例） */
.mini-kanban {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  width: 100%;
  max-width: 260px;
  margin: 0 auto;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.mini-k-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.mini-k-title {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.mini-k-note {
  font-size: 9px;
  color: var(--primary);
  background: rgba(245, 215, 66, 0.12);
  border: 1px solid rgba(245, 215, 66, 0.35);
  padding: 1px 7px;
  border-radius: 10px;
}

.mini-k-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.mini-k-id {
  font-size: 13px;
  font-weight: 900;
  color: var(--primary);
  font-family: var(--mono);
}

.mini-k-tag {
  font-size: 9px;
  color: var(--accent-blue);
  background: rgba(77, 163, 255, 0.15);
  border: 1px solid rgba(77, 163, 255, 0.4);
  padding: 1px 7px;
  border-radius: 10px;
}

.mini-k-progress {
  height: 5px;
  border-radius: 4px;
  background: #0a1a2c;
  border: 1px solid var(--line);
  overflow: hidden;
}

.mini-k-fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--accent-blue), var(--ok), var(--primary));
}

.mini-k-process {
  font-size: 10px;
  color: var(--text);
}

.mini-k-process b {
  color: var(--primary);
}

.mini-k-count {
  font-size: 9px;
  color: var(--ok);
  font-family: var(--mono);
}

.case-desc {
  font-size: 14.5px;
  color: var(--text-muted);
}

/* ---------- 8. 服务流程 ---------- */

.process-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  counter-reset: step;
}

.process-step {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px 28px;
  box-shadow: var(--shadow);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-bottom: 14px;
  border-radius: 50%;
  background: var(--primary);
  color: #0b1a2e;
  font-size: 15px;
  font-weight: 700;
}

.process-step h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
  color: #fff;
}

.process-step p {
  font-size: 14.5px;
  color: var(--text-muted);
}

/* ---------- 9. 常见问题 FAQ ---------- */

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 22px;
  box-shadow: var(--shadow);
}

.faq-item summary {
  cursor: pointer;
  padding: 18px 0;
  font-size: 16px;
  font-weight: 600;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  color: #fff;
}

/* 自定义展开箭头（替代默认三角） */
.faq-item summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--primary);
  line-height: 1;
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item p {
  padding: 0 0 18px;
  font-size: 15px;
  color: var(--text-muted);
  max-width: 640px;
}

/* ---------- 10. 联系我们 ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 40px;
  align-items: start;
}

.contact-info h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 18px;
  color: #fff;
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 20px;
}

.contact-list li {
  display: flex;
  gap: 12px;
  font-size: 15.5px;
}

.contact-label {
  flex-shrink: 0;
  width: 72px;
  color: var(--text-muted);
  font-weight: 600;
}

.contact-note {
  font-size: 13.5px;
  color: var(--text-muted);
  background: rgba(245, 215, 66, 0.06);
  border: 1px solid rgba(245, 215, 66, 0.3);
  border-radius: 8px;
  padding: 12px 16px;
}

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 30px;
  box-shadow: var(--shadow);
}

.form-field {
  margin-bottom: 18px;
}

.form-field label {
  display: block;
  margin-bottom: 7px;
  font-size: 14.5px;
  font-weight: 600;
  color: #fff;
}

.form-field input,
.form-field textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  color: var(--text);
  background: var(--bg-input);
  transition: border-color 0.15s ease;
}

.form-field input::placeholder,
.form-field textarea::placeholder {
  color: #5d7189;
}

.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--primary);
  outline: none;
}

.form-field textarea {
  resize: vertical;
}

.form-tip {
  margin-top: 14px;
  font-size: 13.5px;
  color: var(--warn);
}

.form-tip-ok {
  color: var(--ok);
}

/* ---------- 11. 页脚 ---------- */

.site-footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 36px 0;
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  font-size: 14px;
}

.footer-note {
  font-size: 13px;
  opacity: 0.75;
}

/* ---------- 12. 响应式 ---------- */

/* 平板 */
@media (max-width: 1024px) {
  .service-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .feature-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .process-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .demo-orders {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-inner {
    grid-template-columns: 1fr;
    padding-top: 56px;
    padding-bottom: 64px;
  }

  .hero-visual {
    display: none; /* 移动端隐藏装饰卡片，保持简洁 */
  }

  .hero-title {
    font-size: 34px;
  }
}

/* 移动端 */
@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .primary-nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg-panel);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.4);
    max-height: calc(100vh - 68px);
    overflow-y: auto;
  }

  body.nav-open .primary-nav {
    display: flex;
  }

  .primary-nav a {
    padding: 15px 24px;
    border-top: 1px solid var(--line);
    font-size: 16px;
  }

  .primary-nav .nav-cta {
    margin: 12px 24px 18px;
    text-align: center;
  }
}

/* 手机 */
@media (max-width: 640px) {
  .section {
    padding: 56px 0;
  }

  .section-title {
    font-size: 26px;
  }

  .section-sub {
    font-size: 15.5px;
    margin-bottom: 32px;
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-lead {
    font-size: 16px;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .service-grid {
    grid-template-columns: 1fr;
    gap: 16px;
    margin-bottom: 40px;
  }

  .clients {
    padding: 24px 20px;
  }

  .feature-list {
    grid-template-columns: 1fr;
  }

  .demo-orders {
    grid-template-columns: 1fr;
  }

  .case-grid {
    grid-template-columns: 1fr;
  }

  .process-list {
    grid-template-columns: 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .contact-form {
    padding: 22px 20px;
  }

  .contact-label {
    width: 60px;
  }

  .demo-order-meta {
    font-size: 0.66rem;
  }

  .demo-bar-note {
    display: none;
  }

  .footer-inner {
    flex-direction: column;
  }
}

/* 极小屏（≤380px） */
@media (max-width: 380px) {
  .container {
    padding: 0 18px;
  }

  .brand-text {
    font-size: 16px;
  }

  .hero-title {
    font-size: 25px;
  }

  .section-title {
    font-size: 24px;
  }

  .contact-label {
    width: 56px;
    font-size: 14.5px;
  }

  .demo-order-card {
    padding: 10px 12px;
  }

  .faq-item {
    padding: 0 16px;
  }

  .contact-form {
    padding: 20px 16px;
  }
}

/* ---------- 13. 内页通用组件 ---------- */

.page-hero {
  position: relative;
  overflow: hidden;
  background: var(--bg-deep);
  border-bottom: 1px solid var(--line);
  padding: 60px 0 68px;
}

.page-hero::before {
  content: '';
  position: absolute;
  left: -120px;
  top: -120px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(77, 163, 255, 0.12) 0%, transparent 65%);
  pointer-events: none;
}

.breadcrumb {
  position: relative;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.breadcrumb a {
  color: var(--accent-blue);
}

.breadcrumb a:hover {
  color: #fff;
}

.page-hero-title {
  position: relative;
  font-size: 34px;
  line-height: 1.35;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
}

.page-hero-sub {
  position: relative;
  font-size: 17px;
  color: var(--text-muted);
  max-width: 660px;
  margin-bottom: 28px;
}

.page-hero-actions {
  position: relative;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.cta-section {
  text-align: center;
}

.cta-section .section-sub {
  margin-left: auto;
  margin-right: auto;
}

.cta-section .page-hero-actions {
  justify-content: center;
}

@media (max-width: 640px) {
  .page-hero {
    padding: 44px 0 52px;
  }

  .page-hero-title {
    font-size: 27px;
  }

  .page-hero-sub {
    font-size: 15.5px;
  }
}

/* ---------- 14. 服务介绍页 ---------- */

.service-detail {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
  padding: 8px 0;
}

.service-detail.reverse .service-detail-info {
  order: 2;
}

.service-detail.reverse .service-detail-side {
  order: 1;
}

.svc-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--primary);
  color: #0b1a2e;
  font-weight: 800;
  font-size: 17px;
  font-family: var(--mono);
  margin-bottom: 16px;
}

.service-detail-info h3 {
  font-size: 26px;
  color: #fff;
  margin-bottom: 14px;
  font-weight: 800;
  line-height: 1.4;
}

.svc-badge {
  display: inline-block;
  margin-left: 12px;
  vertical-align: middle;
  font-size: 12px;
  font-weight: 700;
  color: #0b1a2e;
  background: var(--primary);
  padding: 2px 12px;
  border-radius: 20px;
  letter-spacing: 1px;
}

.service-detail-info .svc-lead {
  font-size: 16.5px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.service-detail-info .svc-audience {
  font-size: 14.5px;
  color: var(--text);
  background: rgba(77, 163, 255, 0.08);
  border: 1px solid rgba(77, 163, 255, 0.25);
  border-radius: 8px;
  padding: 12px 16px;
}

.service-detail-info .svc-audience b {
  color: var(--accent-blue);
}

.service-detail-side {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 26px 24px;
  box-shadow: var(--shadow);
}

.service-detail-side h4 {
  font-size: 15px;
  color: #fff;
  margin-bottom: 14px;
  letter-spacing: 1px;
}

.svc-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.svc-list li {
  font-size: 14.5px;
  color: var(--text-muted);
  display: flex;
  gap: 8px;
}

.svc-list li::before {
  content: "✓";
  color: var(--ok);
  font-weight: 700;
  flex-shrink: 0;
}

.svc-price {
  font-size: 13.5px;
  color: var(--text-muted);
  border-top: 1px solid var(--line);
  padding-top: 14px;
  margin-bottom: 18px;
}

.svc-price b {
  color: var(--primary);
}

.svc-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.svc-actions .btn {
  padding: 9px 18px;
  font-size: 14px;
}

/* 套餐 */
.plan-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.plan-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 26px;
  box-shadow: var(--shadow);
  position: relative;
  display: flex;
  flex-direction: column;
}

.plan-card.plan-featured {
  border-color: rgba(245, 215, 66, 0.6);
}

.plan-name {
  font-size: 18px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 18px;
  min-height: 44px;
}

.plan-price {
  font-size: 15px;
  color: var(--text);
  margin-bottom: 18px;
}

.plan-price b {
  font-size: 22px;
  color: var(--primary);
  font-weight: 800;
}

.plan-price span {
  color: var(--text-muted);
  font-size: 13px;
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin-bottom: 22px;
  flex: 1;
}

.plan-features li {
  font-size: 14px;
  color: var(--text-muted);
  display: flex;
  gap: 8px;
}

.plan-features li::before {
  content: "✓";
  color: var(--ok);
  font-weight: 700;
  flex-shrink: 0;
}

.section-more {
  margin-top: 26px;
  font-size: 15px;
}

.section-more a {
  color: var(--accent-blue);
  font-weight: 600;
}

.section-more a:hover {
  color: #fff;
}

.svc-link {
  margin-top: 14px;
  font-size: 14px;
}

.svc-link a {
  color: var(--accent-blue);
  font-weight: 600;
}

.svc-link a:hover {
  color: #fff;
}

@media (max-width: 900px) {
  .service-detail {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .service-detail.reverse .service-detail-info {
    order: 1;
  }

  .service-detail.reverse .service-detail-side {
    order: 2;
  }

  .plan-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- 15. 联系我们页 ---------- */

.form-field select {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  color: var(--text);
  background: var(--bg-input);
  appearance: none;
  -webkit-appearance: none;
  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="12" height="8" viewBox="0 0 12 8"><path d="M1 1l5 5 5-5" fill="none" stroke="%238fa3ba" stroke-width="1.8" stroke-linecap="round"/></svg>');
  background-repeat: no-repeat;
  background-position: right 14px center;
  transition: border-color 0.15s ease;
  cursor: pointer;
}

.form-field select:focus {
  border-color: var(--primary);
  outline: none;
}

/* ---------- 16. 微信悬浮咨询 ---------- */

.wx-float {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 60;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
}

.wx-float-btn {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  border: none;
  background: #07c160;
  color: #fff;
  font-size: 20px;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(7, 193, 96, 0.4);
  transition: transform 0.15s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-family);
}

.wx-float-btn:hover {
  transform: scale(1.06);
}

.wx-float-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  width: 220px;
  box-shadow: var(--shadow);
}

.wx-float-card[hidden] {
  display: none;
}

.wx-float-title {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}

.wx-float-wechat {
  font-size: 13px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 6px;
}

.wx-float-note {
  font-size: 12px;
  color: var(--text-muted);
}

@media (max-width: 640px) {
  .wx-float {
    right: 14px;
    bottom: 14px;
  }

  .wx-float-btn {
    width: 48px;
    height: 48px;
    font-size: 18px;
  }
}