/* =============================================================================
   羽Meo 官网样式
   设计语言：与 App 协同 —— 清新文艺 · 简洁现代 · 运动活力
   主色：#4CAF50（羽Meo 品牌绿）
   ============================================================================= */

:root {
  /* 品牌色 */
  --primary: #4CAF50;
  --primary-light: #E8F5E9;
  --primary-dark: #388E3C;
  --accent: #4A90D9;
  --bg: #f0f4f8;
  --card-bg: rgba(255, 255, 255, 0.88);
  --text: #1a1a2e;
  --text-secondary: #5b6470;
  --text-muted: #9aa3ad;

  /* 表面 */
  --surface: #ffffff;
  --surface-soft: #f8fafc;
  --border: rgba(0, 0, 0, 0.06);

  /* 阴影 & 圆角 */
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
  --shadow-lift: 0 18px 44px rgba(0, 0, 0, 0.13);
  --radius: 20px;
  --radius-sm: 14px;

  /* 动效 */
  --ease: cubic-bezier(0.25, 0.8, 0.25, 1);
  --dur: 0.28s;
}

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

/* 字体栈：使用系统默认 UI 字体，跨平台自适应、阅读体验更统一 */
body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(1200px 520px at 8% -8%, var(--primary-light), transparent 60%),
    radial-gradient(1000px 420px at 108% 12%, rgba(74, 144, 217, 0.08), transparent 55%),
    var(--bg);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.7;
  padding: 20px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container,
.doc-container {
  max-width: 920px;
  width: 100%;
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: var(--radius);
  padding: 44px 40px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.4);
}

/* ============================================================
   微交互
   ============================================================ */

/* 滚动触发的淡入动画（配合 JS 添加 .in-view） */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}
.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* 卡片悬停上浮 */
.lift {
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.lift:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lift);
}

/* CTA 按钮发光脉冲 */
.pulse-glow {
  animation: pulse-glow 2.4s ease-in-out infinite;
}
@keyframes pulse-glow {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(76, 175, 80, 0.45);
  }
  50% {
    box-shadow: 0 0 0 14px rgba(76, 175, 80, 0);
  }
}

/* ============================================================
   头部
   ============================================================ */
.header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.logo {
  width: 48px;
  height: 48px;
  background: var(--primary);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 24px;
  font-weight: 700;
  flex-shrink: 0;
  overflow: hidden;
}

.logo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.logo-text {
  font-size: 24px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.5px;
  line-height: 1;
}
.logo-text span {
  color: var(--primary);
}

/* ============================================================
   导航
   ============================================================ */
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}
.nav a {
  padding: 9px 22px;
  border-radius: 30px;
  background: rgba(255, 255, 255, 0.7);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.25s var(--ease);
  border: 1px solid transparent;
}
.nav a:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
  border-color: var(--primary);
  transform: translateY(-1px);
}
.nav a.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ============================================================
   首页 Hero
   ============================================================ */
.hero {
  text-align: center;
  padding: 22px 0 18px;
}
.hero .hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 30px;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(32px, 6vw, 52px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 18px;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, #2e7d32 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero .slogan {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 28px;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform 0.22s var(--ease), box-shadow 0.22s var(--ease), background 0.22s var(--ease);
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(76, 175, 80, 0.35);
}
.btn-ghost {
  background: #fff;
  color: var(--text);
  border: 1.5px solid rgba(0, 0, 0, 0.1);
}
.btn-ghost:hover {
  border-color: var(--primary);
  color: var(--primary-dark);
  transform: translateY(-2px);
}

/* ============================================================
   首页功能模块
   ============================================================ */
.section {
  margin-top: 52px;
}
.section-head {
  text-align: center;
  margin-bottom: 30px;
}
.section-head .eyebrow {
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 8px;
}
.section-head h2 {
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 900;
  color: var(--text);
  letter-spacing: -0.5px;
  border: none;
  padding: 0;
}
.section-head .lead {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 10px auto 0;
}

/* 特性卡片网格 */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}
.feature-card {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 26px 22px;
  border: 1px solid var(--border);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}
.feature-card .f-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 16px;
}
.feature-card h3 {
  font-size: 17px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 8px;
}
.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ============================================================
   首页「社交 + 竞技」双栏
   ============================================================ */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 30px;
}
.split-card {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 30px 26px;
  border: 1px solid var(--border);
}
.split-card .s-icon {
  font-size: 30px;
  margin-bottom: 14px;
}
.split-card h3 {
  font-size: 20px;
  font-weight: 900;
  color: var(--text);
  margin-bottom: 6px;
}
.split-card .s-desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.split-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.split-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 0;
  font-size: 14px;
  color: var(--text);
  border-bottom: 1px solid var(--border);
}
.split-list li:last-child {
  border-bottom: none;
}
.split-list .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  flex-shrink: 0;
}

/* ============================================================
   CTA 区块
   ============================================================ */
.cta-block {
  margin-top: 54px;
  padding: 44px 30px;
  text-align: center;
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(76, 175, 80, 0.12), rgba(76, 175, 80, 0.04)),
    var(--surface);
  border: 1px solid rgba(76, 175, 80, 0.2);
}
.cta-block h3 {
  font-size: clamp(24px, 4vw, 30px);
  font-weight: 900;
  color: var(--text);
  margin-bottom: 10px;
}
.cta-block p {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 460px;
  margin: 0 auto 24px;
}

/* ============================================================
   通用内容
   ============================================================ */
.content {
  min-height: 300px;
}
h1 {
  font-size: 30px;
  font-weight: 900;
  margin-bottom: 12px;
  color: var(--text);
}
h2 {
  font-size: 21px;
  font-weight: 800;
  margin-top: 30px;
  margin-bottom: 12px;
  color: var(--text);
  padding-left: 14px;
  border-left: 4px solid var(--primary);
}
h3 {
  font-size: 17px;
  font-weight: 800;
  margin-top: 22px;
  margin-bottom: 8px;
  color: var(--text);
}
p {
  color: var(--text-secondary);
  margin-bottom: 12px;
}
ul, ol {
  padding-left: 24px;
  margin-bottom: 16px;
  color: var(--text-secondary);
}
ul li, ol li {
  margin-bottom: 6px;
}

/* ============================================================
   文档页（隐私/协议/关于/段位）
   ============================================================ */
.doc-title {
  text-align: center;
  font-size: 32px;
  font-weight: 900;
  color: var(--text);
  margin-bottom: 4px;
  letter-spacing: 0.5px;
}
.doc-sub {
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.back-link {
  display: inline-block;
  margin-bottom: 20px;
  color: var(--primary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
}
.back-link:hover {
  text-decoration: underline;
}

/* 表格 */
.doc-container table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 16px;
  font-size: 14px;
  border-radius: 8px;
  overflow: hidden;
}
.doc-container table thead {
  background: var(--primary);
}
.doc-container table th,
.doc-container table td {
  padding: 11px 13px;
  text-align: left;
  border-bottom: 1px solid #e8e8e8;
  color: var(--text-secondary);
}
.doc-container table thead th {
  color: #fff;
}
.doc-container table tbody tr {
  transition: background 0.2s var(--ease);
}
.doc-container table tbody tr:hover {
  background: var(--surface-soft);
}
.doc-container table tbody tr:last-child td {
  border-bottom: none;
}

/* 高亮框 */
.highlight-box {
  background: #f0f7ff;
  border-left: 4px solid var(--accent);
  padding: 15px 18px;
  border-radius: 8px;
  margin: 12px 0;
}
.highlight-box.green {
  background: var(--primary-light);
  border-left-color: var(--primary);
}
.highlight-box.orange {
  background: #fff8f0;
  border-left-color: #E67E22;
}
.highlight-box p {
  margin: 0;
  color: var(--text-secondary);
}

/* 联系信息卡片 */
.contact-item {
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 15px 18px;
  margin-bottom: 10px;
}
.contact-item strong {
  color: var(--text);
}

/* ============================================================
   段位说明页
   ============================================================ */
.rank-hero {
  text-align: center;
  padding: 10px 0 16px;
}
.rank-hero .rank-illust {
  width: 100%;
  max-width: 820px;
  height: auto;
  margin: 8px auto 24px;
  display: block;
  border-radius: 18px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  background: #fff;
}
.rank-hero p {
  font-size: 16px;
  color: var(--text-secondary);
}

.rank-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 16px 0;
}
.rank-card {
  border-radius: 14px;
  padding: 18px;
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.rank-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--rank-bg, var(--surface-soft));
  opacity: 0.5;
  z-index: 0;
}
.rank-card > * {
  position: relative;
  z-index: 1;
}
.rank-card .rank-name {
  display: inline-block;
  font-size: 16px;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: 20px;
  color: #fff;
  background: var(--rank-color, var(--primary));
  margin-bottom: 8px;
  letter-spacing: 1px;
}
.rank-card .rank-range {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.rank-card .rank-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.65;
}

.rank-group {
  margin-top: 24px;
  margin-bottom: 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}
.rank-group::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
  display: inline-block;
}

.rank-chip {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  color: #fff;
}

.formula {
  background: var(--surface-soft);
  border: 1px dashed #cfd8dc;
  border-radius: 12px;
  padding: 15px 18px;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
  color: var(--text);
  margin: 12px 0;
  white-space: pre-wrap;
  word-break: break-word;
}

.kv-table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 16px;
  font-size: 14px;
}
.kv-table th,
.kv-table td {
  padding: 11px 13px;
  border-bottom: 1px solid #e8e8e8;
  text-align: left;
  color: var(--text-secondary);
}
.kv-table thead th {
  background: var(--primary);
  color: #fff;
  font-weight: 700;
}
.kv-table tbody tr {
  transition: background 0.2s var(--ease);
}
.kv-table tbody tr:hover {
  background: var(--surface-soft);
}
.kv-table tbody tr:last-child td {
  border-bottom: none;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin: 12px 0;
}
.info-box {
  background: var(--surface-soft);
  border-radius: 12px;
  padding: 14px 16px;
  border-left: 4px solid var(--primary);
}
.info-box .k {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.info-box .v {
  font-size: 20px;
  font-weight: 900;
  color: var(--text);
}
.info-box .desc {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ============================================================
   卡片胶囊（历史首页用）
   ============================================================ */
.card-capsule {
  background: var(--surface-soft);
  border-radius: var(--radius-sm);
  padding: 18px 22px;
  margin-bottom: 14px;
  border: 1px solid var(--border);
  transition: transform 0.22s var(--ease), box-shadow 0.22s var(--ease);
}
.card-capsule:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}
.card-capsule .label {
  font-size: 13px;
  font-weight: 700;
  color: var(--primary-dark);
  display: block;
  margin-bottom: 6px;
}

/* ============================================================
   底部
   ============================================================ */
.footer {
  margin-top: 40px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}
.footer p {
  margin: 6px 0;
  color: var(--text-muted);
}
.footer a {
  color: var(--primary);
  text-decoration: none;
}
.footer a:hover {
  text-decoration: underline;
}
/* 跳过导航，直达主内容（键盘 / 读屏用户） */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  z-index: 999;
  background: var(--primary);
  color: #fff;
  padding: 10px 18px;
  border-radius: 0 0 12px 0;
  font-weight: 700;
  text-decoration: none;
}
.skip-link:focus {
  left: 0;
  outline: 2px solid var(--primary-dark);
  outline-offset: 2px;
}
.footer .beian-placeholder a {
  color: #5b6470; /* 原 #bbb 对比度不达标，提升以符合 WCAG AA */
  border: 1px dashed #ccc;
  border-radius: 4px;
  padding: 1px 8px;
  display: inline-block;
}

/* ============================================================
   响应式（移动端优先）
   ============================================================ */
@media (max-width: 720px) {
  body { padding: 12px; }
  .container, .doc-container { padding: 26px 18px; }
  .logo-text { font-size: 21px; }
  .nav a { font-size: 13px; padding: 7px 14px; }
  .nav { margin-bottom: 24px; }
  .hero h1 { font-size: 30px; }
  .hero .slogan { font-size: 16px; }
  .btn { padding: 13px 26px; font-size: 14px; }
  .split { grid-template-columns: 1fr; }
  .feature-card { padding: 22px 18px; }
  .cta-block { padding: 34px 20px; }
  h1 { font-size: 24px; }
}

@media (max-width: 600px) {
  .rank-grid { grid-template-columns: 1fr; }
  .rank-hero .rank-illust { width: 100%; border-radius: 14px; }
  .doc-title { font-size: 26px; }
  h2 { font-size: 19px; }
}

/* ============================================================
   界面交互优化（平滑滚动 / 返回顶部 / 键盘可达性）
   ============================================================ */

/* 锚点平滑滚动，并为顶部偏移预留空间 */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}

/* 键盘焦点高亮（WCAG：清晰可见的对焦轮廓） */
a:focus-visible,
button:focus-visible,
.btn:focus-visible,
.nav a:focus-visible {
  outline: 3px solid var(--primary-dark);
  outline-offset: 2px;
  border-radius: 6px;
}

/* 返回顶部悬浮按钮 */
.to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 46px;
  height: 46px;
  border: none;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(76, 175, 80, 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.28s var(--ease), transform 0.28s var(--ease), visibility 0.28s;
  z-index: 200;
}
.to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.to-top:hover {
  transform: translateY(-2px);
}
.to-top:focus-visible {
  outline-offset: 3px;
}

@media (max-width: 600px) {
  .to-top { right: 14px; bottom: 14px; width: 42px; height: 42px; }
}