/* ============================================================
   tpl-website — 多端业务应用框架官网样式
   对齐 DESIGN.md 设计系统（单一事实源）
   纯原生 CSS，无框架、无构建
   ============================================================ */

/* ---------- 角色变量（单一事实源）----------
   亮色皮肤为默认值；暗色皮肤仅覆盖角色变量层 */
:root {
  --color-primary: #3b5998;
  --color-primary-strong: #2f4a80;
  --color-accent: #e8923c;
  --color-accent-strong: #d37f2a;
  --color-success: #4aa878;
  --color-danger: #d94e3c;

  --color-bg: #f7f5f0;
  --color-surface: #ffffff;
  --color-surface-2: #fbfaf7;
  --color-text: #292522;
  --color-text-secondary: #6e6a65;
  --color-border: #d9d4cc;
  --color-divider: #f0ece6;
  --color-disabled: #eeece6;

  --color-code-bg: #26282b;
  --color-code-text: #e8e4de;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 24px;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;
  --space-2xl: 32px;
  --space-3xl: 48px;
  --space-4xl: 64px;

  --font-sans: "PingFang SC", "HarmonyOS Sans", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", "Consolas", "Courier New", monospace;

  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);

  --header-h: 64px;
  --content-max: 1120px;
  --content-max-narrow: 820px;

  /* 语义别名（指向角色变量，随皮肤联动） */
  --indigo: var(--color-primary);
  --gold: var(--color-accent);
  --paper: var(--color-bg);
  --ink: var(--color-text);
  --inkstone: var(--color-text-secondary);
  --silver: var(--color-border);
}

/* ---------- 暗色皮肤：仅覆盖角色变量 ---------- */
html[data-theme="dark"] {
  --color-primary: #5b7db1;
  --color-primary-strong: #6d8dc4;
  --color-accent: #e8923c;
  --color-accent-strong: #f0a45c;
  --color-success: #7bc49a;
  --color-danger: #e0705f;

  --color-bg: #1a1c1e;
  --color-surface: #26282b;
  --color-surface-2: #2b2d30;
  --color-text: #e8e4de;
  --color-text-secondary: #a8a29a;
  --color-border: #3a3a38;
  --color-divider: #2e3033;
  --color-disabled: #2e3033;

  --color-code-bg: #111214;
  --color-code-text: #e8e4de;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.55);
}

/* ---------- 基础重置 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color 0.25s var(--ease-out), color 0.25s var(--ease-out);
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---------- 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 20px;
}

.container-narrow {
  max-width: var(--content-max-narrow);
}

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: color-mix(in srgb, var(--color-bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out), background-color 0.25s var(--ease-out);
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.brand-logo {
  display: inline-flex;
  color: var(--color-primary);
}

.brand-name {
  font-variant-numeric: tabular-nums;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  margin-left: auto;
}

.nav-link {
  position: relative;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: 6px 2px;
  transition: color 0.18s var(--ease-out);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s var(--ease-in-out);
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--color-text);
}

.nav-link.is-active::after,
.nav-link:hover::after {
  transform: scaleX(1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* 主题切换按钮 */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--color-text-secondary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: color 0.18s var(--ease-out), background-color 0.18s var(--ease-out), transform 0.15s var(--ease-out), border-color 0.18s var(--ease-out);
}

.theme-toggle:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  transform: scale(1.05);
}

.theme-toggle:active {
  transform: scale(0.95);
}

/* 图标展示「当前主题」：亮色显示太阳、暗色显示月亮；按钮 aria-label 表示点击后的动作 */
.icon-moon { display: none; }
html[data-theme="dark"] .icon-sun { display: none; }
html[data-theme="dark"] .icon-moon { display: block; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: transform 0.15s var(--ease-out), box-shadow 0.2s var(--ease-out), background-color 0.2s var(--ease-out), color 0.2s var(--ease-out), border-color 0.2s var(--ease-out);
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.97);
}

.btn-sm {
  height: 40px;
  padding: 0 20px;
  font-size: 15px;
}

.btn-lg {
  height: 48px;
  padding: 0 28px;
  font-size: 17px;
  border-radius: var(--radius-md);
}

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

.btn-primary:hover {
  background: var(--color-primary-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-accent {
  background: var(--color-accent);
  /* 金底用墨色文字，保证 WCAG AA 对比度（白字在金底上仅约 2.4:1） */
  color: var(--color-text);
  border-radius: var(--radius-pill);
}

.btn-accent:hover {
  background: var(--color-accent-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.header-cta {
  display: none;
}

/* 移动端汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.25s var(--ease-in-out), opacity 0.2s var(--ease-out);
}

.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);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: calc(var(--space-4xl) + var(--header-h)) 0 var(--space-4xl);
  overflow: hidden;
  background:
    radial-gradient(1100px 480px at 82% -8%, color-mix(in srgb, var(--color-primary) 12%, transparent), transparent 60%),
    radial-gradient(700px 360px at 8% 4%, color-mix(in srgb, var(--color-accent) 10%, transparent), transparent 55%);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-3xl);
  align-items: center;
}

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-primary) 24%, transparent);
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: var(--space-lg);
}

.hero-title {
  font-size: clamp(34px, 6vw, 56px);
  line-height: 1.12;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
}

.hero-title .accent {
  color: var(--color-primary);
  background: linear-gradient(120deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  font-size: clamp(16px, 2vw, 18px);
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 34em;
  margin-bottom: var(--space-2xl);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.hero-badges {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: 0;
  margin: 0;
}

.hero-badges li {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-sm);
}

.hero-art {
  display: flex;
  justify-content: center;
}

.hero-art svg {
  width: 100%;
  max-width: 460px;
  height: auto;
}

/* 架构图 SVG 样式 */
.d-node {
  fill: color-mix(in srgb, var(--color-primary) 10%, transparent);
  stroke: var(--color-primary);
  stroke-width: 1.5;
}

.d-gateway {
  fill: var(--color-primary);
}

.d-service {
  fill: color-mix(in srgb, var(--color-accent) 14%, transparent);
  stroke: var(--color-accent);
  stroke-width: 1.5;
}

.d-flow {
  stroke: var(--color-border);
  stroke-width: 1.5;
  fill: none;
  stroke-dasharray: 4 4;
}

.d-title {
  fill: var(--color-text-secondary);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.d-text {
  fill: var(--color-text);
  font-size: 12px;
  font-weight: 600;
}

.d-text-strong {
  fill: var(--color-text);
  font-size: 12.5px;
  font-weight: 700;
}

.d-text-sub {
  fill: var(--color-text-secondary);
  font-size: 10px;
  font-weight: 500;
}

/* ---------- 通用 Section ---------- */
.section {
  padding: var(--space-4xl) 0;
}

.section-alt {
  background: var(--color-surface-2);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}

.section-head {
  max-width: 640px;
  margin: 0 auto var(--space-3xl);
  text-align: center;
}

.section-title {
  font-size: clamp(24px, 3.4vw, 32px);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-md);
}

.section-desc {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* ---------- 特性卡片 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out), border-color 0.2s var(--ease-out);
}

.feature-card {
  padding: var(--space-xl);
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: color-mix(in srgb, var(--color-primary) 40%, var(--color-border));
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary) 10%, transparent);
  margin-bottom: var(--space-lg);
}

.feature-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.feature-card p {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--color-text-secondary);
}

/* ---------- 技术栈 ---------- */
.stack-list {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.stack-row {
  display: grid;
  grid-template-columns: 160px 1fr;
  align-items: center;
  gap: var(--space-lg);
  padding: 16px var(--space-xl);
  border-bottom: 1px solid var(--color-divider);
}

.stack-row:last-child {
  border-bottom: none;
}

.stack-label {
  font-weight: 600;
  font-size: 15px;
  color: var(--color-text);
}

.stack-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
}

/* ---------- 架构流程 ---------- */
.arch-flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  max-width: 720px;
  margin: 0 auto;
}

.arch-col {
  width: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-lg) var(--space-xl);
  text-align: center;
}

.arch-col-title {
  display: block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  margin-bottom: var(--space-md);
}

.arch-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
}

.chip {
  font-size: 14px;
  font-weight: 500;
  padding: 7px 14px;
  border-radius: var(--radius-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.chip-accent {
  border-color: color-mix(in srgb, var(--color-accent) 45%, var(--color-border));
  color: var(--color-accent-strong);
  background: color-mix(in srgb, var(--color-accent) 10%, transparent);
}

.chip-service {
  border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-border));
  color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary) 10%, transparent);
}

.chip-data {
  border-color: color-mix(in srgb, var(--color-success) 45%, var(--color-border));
  color: var(--color-success);
  background: color-mix(in srgb, var(--color-success) 10%, transparent);
}

.arch-arrow {
  font-size: 22px;
  line-height: 1;
  color: var(--color-text-secondary);
  padding: 2px 0;
}

/* ---------- 快速开始 ---------- */
.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  counter-reset: step;
}

.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-lg);
  align-items: start;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-weight: 700;
  font-size: 18px;
  color: #fff;
  background: var(--color-primary);
  flex-shrink: 0;
}

/* 允许 1fr 网格列收缩到内容最小宽度以下，避免长命令撑破页面 */
.step-body {
  min-width: 0;
}

.step-desc {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.code-block {
  position: relative;
  background: var(--color-code-bg);
  border-radius: var(--radius-md);
  border: 1px solid color-mix(in srgb, var(--color-code-text) 12%, transparent);
  overflow: hidden;
}

.code-block pre {
  margin: 0;
  padding: 16px 48px 16px 18px;
  overflow-x: auto;
}

.code-block code {
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--color-code-text);
  white-space: pre;
  overflow-wrap: break-word;
  word-break: break-word;
}

.code-copy {
  position: absolute;
  top: 8px;
  right: 8px;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-code-text);
  background: color-mix(in srgb, var(--color-code-text) 14%, transparent);
  border-radius: var(--radius-sm);
  padding: 5px 10px;
  opacity: 0.85;
  transition: opacity 0.15s var(--ease-out), background-color 0.15s var(--ease-out);
}

.code-copy:hover {
  opacity: 1;
  background: color-mix(in srgb, var(--color-code-text) 24%, transparent);
}

.code-copy.is-copied {
  background: var(--color-success);
  color: #fff;
  opacity: 1;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-3xl) 0 var(--space-xl);
  margin-top: 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-2xl);
  flex-wrap: wrap;
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid var(--color-divider);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-width: 320px;
}

.footer-brand .brand-logo {
  color: var(--color-primary);
}

.footer-name {
  font-weight: 700;
  font-size: 17px;
}

.footer-tag {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  font-size: 14.5px;
}

.footer-links a {
  color: var(--color-text-secondary);
  transition: color 0.18s var(--ease-out);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  padding-top: var(--space-xl);
  font-size: 13px;
  color: var(--color-text-secondary);
}

.footer-tech {
  font-variant-numeric: tabular-nums;
}

/* ---------- 滚动淡入 ----------
   仅在 JS 可用（<html> 带 .js 类）时才初始隐藏，
   无 JS 或脚本加载失败时内容直接可见（渐进增强）。 */
.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}

.js .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

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

  .hero-inner {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .hero-copy {
    text-align: center;
  }

  .hero-sub {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-cta {
    justify-content: center;
  }

  .hero-badges {
    justify-content: center;
  }

  .hero-art {
    order: -1;
  }

  .hero-art svg {
    max-width: 400px;
  }
}

@media (max-width: 768px) {
  .header-cta {
    display: inline-flex;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    padding: var(--space-sm) 0;
    margin: 0;
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.25s var(--ease-out), opacity 0.2s var(--ease-out), visibility 0.25s;
  }

  .main-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-link {
    padding: 14px 20px;
    font-size: 16px;
  }

  .nav-link::after {
    display: none;
  }

  .nav-link:hover,
  .nav-link.is-active {
    color: var(--color-primary);
    background: color-mix(in srgb, var(--color-primary) 6%, transparent);
  }

  .stack-row {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
    padding: 14px var(--space-lg);
  }
}

@media (max-width: 560px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: var(--space-3xl) 0;
  }

  .hero {
    padding: var(--space-3xl) 0;
  }

  .hero-cta .btn {
    flex: 1 1 auto;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ---------- 减少动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}