/* ==========================================================================
   自由猫 (freecat.best) 官方品牌核心样式库
   色彩体系：海洋绿、米白、深灰、天空蓝
   设计理念：自由探索、开阔无界、权威透明、全终端自适应
   ========================================================================== */

:root {
  --color-primary: #0d9488;         /* 海洋绿 主色 */
  --color-primary-dark: #0f766e;    /* 海洋绿 悬停加深 */
  --color-primary-light: #14b8a6;   /* 海洋绿 高亮 */
  --color-primary-subtle: #f0fdfa;  /* 海洋绿 极淡背景 */
  --color-primary-border: #99f6e4;  /* 海洋绿 边框 */

  --color-sky: #0284c7;             /* 天空蓝 探索点缀 */
  --color-sky-light: #e0f2fe;        /* 天空蓝 柔和背景 */
  --color-sky-hover: #0369a1;        /* 天空蓝 悬停 */

  --color-dark: #1e293b;            /* 深灰 主文字/核心对比 */
  --color-dark-surface: #0f172a;    /* 深灰 背景块 */
  --color-gray-sub: #475569;        /* 次级文本灰 */
  --color-gray-muted: #64748b;      /* 辅助弱灰 */

  --color-cream: #faf9f5;           /* 米白 主页面背景 */
  --color-card-bg: #ffffff;         /* 纯白 卡片背景 */
  --color-card-hover: #ffffff;
  --color-border: #e2e8f0;          /* 界面边框灰 */
  --color-border-subtle: #f1f5f9;

  --color-accent-badge: #dcfce7;
  --color-accent-badge-text: #166534;
  --color-warning-badge: #fef3c7;
  --color-warning-badge-text: #92400e;

  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.08), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 24px -4px rgba(15, 23, 42, 0.08), 0 4px 8px -2px rgba(15, 23, 42, 0.03);
  --shadow-hover: 0 20px 30px -10px rgba(13, 148, 136, 0.15), 0 6px 12px -3px rgba(15, 23, 42, 0.06);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-cream);
  color: var(--color-dark);
  line-height: 1.65;
  overflow-x: hidden;
  width: 100%;
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 链接与排版 */
a {
  color: var(--color-sky);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

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

/* 容器与栅格 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.container-narrow {
  max-width: 860px;
}

/* ================= 导航条 Header ================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(250, 249, 245, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: all 0.3s ease;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.header-brand {
  display: flex;
  align-items: center;
  text-decoration: none !important;
}

.header-logo {
  height: 44px;
  width: auto;
  object-fit: contain;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-dark);
  padding: 8px 4px;
  position: relative;
  transition: color 0.2s ease;
  text-decoration: none !important;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* 移动端菜单切换按钮 */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
  color: var(--color-dark);
  border-radius: var(--radius-sm);
}

.mobile-toggle:focus {
  outline: 2px solid var(--color-primary);
}

/* 统一按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none !important;
  cursor: pointer;
  transition: all 0.25s ease;
  box-sizing: border-box;
  max-width: 100%;
  border: 1px solid transparent;
  line-height: 1.2;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, #0b8277 100%);
  color: #ffffff !important;
  box-shadow: 0 4px 10px rgba(13, 148, 136, 0.25);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, #086158 100%);
  transform: translateY(-1px);
  box-shadow: 0 6px 14px rgba(13, 148, 136, 0.35);
}

.btn-secondary {
  background: #ffffff;
  color: var(--color-dark) !important;
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-cream);
  border-color: var(--color-primary);
  color: var(--color-primary) !important;
}

.btn-sky {
  background: linear-gradient(135deg, var(--color-sky) 0%, #0369a1 100%);
  color: #ffffff !important;
}

.btn-sky:hover {
  background: linear-gradient(135deg, #0274b0 0%, #025380 100%);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 14px;
}

.btn-block {
  width: 100%;
}

/* ================= 探索式 Hero 区域 ================= */
.hero-section {
  position: relative;
  padding: 64px 0 56px 0;
  background: linear-gradient(180deg, rgba(240, 253, 250, 0.8) 0%, rgba(250, 249, 245, 0.95) 70%, var(--color-cream) 100%);
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}

.hero-backdrop {
  position: absolute;
  top: -120px;
  right: -80px;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.12) 0%, rgba(13, 148, 136, 0.04) 60%, transparent 80%);
  pointer-events: none;
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 960px;
  margin: 0 auto;
}

.badge-official {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background-color: var(--color-primary-subtle);
  border: 1px solid var(--color-primary-border);
  color: var(--color-primary-dark);
  font-size: 13.5px;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
}

.badge-official::before {
  content: '';
  width: 8px;
  height: 8px;
  background-color: var(--color-primary);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.2);
}

.hero-title {
  font-size: clamp(1.8rem, 3.8vw, 2.85rem);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.02em;
  color: var(--color-dark);
  margin-bottom: 20px;
}

.hero-title span {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-sky) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lead {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--color-gray-sub);
  line-height: 1.7;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.hero-verification-notice {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background-color: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 13px;
  color: var(--color-gray-muted);
  box-shadow: var(--shadow-sm);
}

/* ================= 核心特色卡片 ================= */
.section {
  padding: 64px 0;
  position: relative;
}

.section-alt {
  background-color: #ffffff;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 48px auto;
}

.section-tag {
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 14px;
  line-height: 1.3;
}

.section-desc {
  font-size: 15.5px;
  color: var(--color-gray-sub);
  line-height: 1.65;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  border-color: var(--color-primary-border);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--color-primary-subtle);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
  border: 1px solid var(--color-primary-border);
}

.feature-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-dark);
}

.feature-text {
  font-size: 14.5px;
  color: var(--color-gray-sub);
  line-height: 1.6;
}

/* ================= 套餐矩阵 Plan Cards ================= */
.plans-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-bottom: 32px;
}

.plan-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px 28px 24px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
}

.plan-card.popular {
  border: 2px solid var(--color-primary);
  box-shadow: var(--shadow-lg);
  transform: scale(1.02);
}

.plan-popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-sky) 100%);
  color: #ffffff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
}

.plan-status-pill {
  display: inline-block;
  align-self: flex-start;
  padding: 4px 10px;
  background-color: var(--color-sky-light);
  color: var(--color-sky);
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.plan-name {
  font-size: 20px;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.plan-summary {
  font-size: 13.5px;
  color: var(--color-gray-muted);
  min-height: 42px;
  margin-bottom: 20px;
  line-height: 1.5;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px dashed var(--color-border);
}

.plan-price-currency {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-dark);
}

.plan-price-amount {
  font-size: 34px;
  font-weight: 800;
  color: var(--color-dark);
  line-height: 1;
}

.plan-price-unit {
  font-size: 13.5px;
  color: var(--color-gray-muted);
}

.plan-specs {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.plan-spec-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--color-dark);
  margin-bottom: 12px;
  line-height: 1.45;
}

.plan-spec-icon {
  color: var(--color-primary);
  font-weight: bold;
  flex-shrink: 0;
}

.plan-notice {
  font-size: 12px;
  color: var(--color-gray-muted);
  background-color: #f8fafc;
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  margin-bottom: 20px;
  line-height: 1.4;
  border: 1px solid #edf2f7;
}

/* ================= 响应式表格与说明卡片 ================= */
.table-responsive-wrapper {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 28px 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: #ffffff;
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
  min-width: 620px;
}

.specs-table th {
  background-color: var(--color-primary-subtle);
  color: var(--color-primary-dark);
  padding: 14px 18px;
  font-weight: 700;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.specs-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-dark);
}

.specs-table tr:last-child td {
  border-bottom: none;
}

.specs-table tr:hover td {
  background-color: #fbfdfe;
}

.verification-callout {
  background-color: #ffffff;
  border-left: 4px solid var(--color-sky);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 32px 0;
  box-shadow: var(--shadow-sm);
  border-top: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.verification-callout h4 {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.verification-callout p {
  font-size: 14.5px;
  color: var(--color-gray-sub);
  line-height: 1.65;
}

/* ================= 安全操作准则区 ================= */
.safe-guide-card {
  background: linear-gradient(135deg, #f0fdfa 0%, #ffffff 100%);
  border: 1px solid var(--color-primary-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin: 40px 0;
}

.safe-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.safe-item {
  background: #ffffff;
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.safe-item h5 {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.safe-item p {
  font-size: 13.5px;
  color: var(--color-gray-sub);
  line-height: 1.55;
}

/* ================= 文章专栏卡片 ================= */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.article-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  text-decoration: none !important;
  color: inherit;
}

.article-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--color-gray-muted);
  margin-bottom: 12px;
}

.article-category {
  color: var(--color-primary);
  font-weight: 600;
  background-color: var(--color-primary-subtle);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.article-card-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 12px;
  line-height: 1.4;
  transition: color 0.2s ease;
}

.article-card:hover .article-card-title {
  color: var(--color-primary);
}

.article-card-snippet {
  font-size: 14px;
  color: var(--color-gray-sub);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--color-primary);
  padding-top: 14px;
  border-top: 1px solid #f1f5f9;
}

/* ================= 文章正文单页样式 ================= */
.article-header {
  padding: 48px 0 32px 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 36px;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: var(--color-gray-muted);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.breadcrumb-nav a {
  color: var(--color-gray-muted);
  text-decoration: none;
}

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

.breadcrumb-separator {
  color: #cbd5e1;
}

.article-page-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--color-dark);
  margin-bottom: 16px;
}

.article-page-meta {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 14px;
  color: var(--color-gray-muted);
  flex-wrap: wrap;
}

.article-body {
  font-size: 16px;
  line-height: 1.85;
  color: #24292f;
  margin-bottom: 48px;
}

.article-body h2 {
  font-size: 22px;
  font-weight: 800;
  color: var(--color-dark);
  margin: 36px 0 16px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.article-body h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-dark);
  margin: 28px 0 12px 0;
}

.article-body p {
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  margin: 0 0 24px 24px;
}

.article-body li {
  margin-bottom: 10px;
  line-height: 1.7;
}

.article-body blockquote {
  border-left: 4px solid var(--color-primary);
  background-color: var(--color-primary-subtle);
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-dark);
  font-size: 15px;
}

.article-cta-box {
  background: linear-gradient(135deg, #f0fdfa 0%, #e0f2fe 100%);
  border: 1px solid var(--color-primary-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin: 48px 0;
  text-align: center;
}

.article-cta-box h3 {
  font-size: 20px;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 10px;
}

.article-cta-box p {
  font-size: 15px;
  color: var(--color-gray-sub);
  max-width: 620px;
  margin: 0 auto 20px auto;
}

.article-navigation-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 40px 0;
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
}

.nav-article-card {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: all 0.2s ease;
  text-decoration: none !important;
}

.nav-article-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.nav-article-label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--color-gray-muted);
  margin-bottom: 6px;
}

.nav-article-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.4;
}

/* ================= 规范要求的底部三部曲顺序 =================
   1. 用户反馈区域 (#feedback)
   2. FAQ 区域 (#faq)
   3. 页脚 (Footer)
   ========================================================= */

/* 1. 用户反馈与口碑评价区域 */
.feedback-section {
  padding: 64px 0;
  background-color: #ffffff;
  border-top: 1px solid var(--color-border);
}

.reviews-badge {
  display: inline-block;
  padding: 4px 16px;
  background-color: var(--color-sky-light);
  color: var(--color-sky);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
  border: 1px solid #bae6fd;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 36px;
}

.review-card {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.review-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.review-stars {
  color: #f59e0b;
  font-size: 18px;
  letter-spacing: 3px;
  margin-bottom: 16px;
}

.review-quote {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--color-gray-sub);
  margin-bottom: 24px;
  flex-grow: 1;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 18px;
  border-top: 1px solid #f1f5f9;
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
  color: #ffffff;
  flex-shrink: 0;
}

.avatar-teal {
  background: linear-gradient(135deg, #0d9488 0%, #0f766e 100%);
}

.avatar-sky {
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
}

.avatar-dark {
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
}

.review-user-info {
  display: flex;
  flex-direction: column;
}

.review-user-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.3;
}

.review-user-role {
  font-size: 13px;
  color: var(--color-gray-muted);
  margin-top: 3px;
}

.feedback-card {
  max-width: 720px;
  margin: 0 auto;
  background: var(--color-cream);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: var(--shadow-sm);
}

.feedback-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-dark);
}

.form-control {
  width: 100%;
  padding: 12px 14px;
  font-size: 14.5px;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: #ffffff;
  color: var(--color-dark);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  box-sizing: border-box;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

textarea.form-control {
  min-height: 100px;
  resize: vertical;
}

.feedback-notice {
  font-size: 13px;
  color: var(--color-gray-muted);
  line-height: 1.5;
}

.feedback-success {
  display: none;
  padding: 16px;
  background-color: var(--color-accent-badge);
  color: var(--color-accent-badge-text);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  text-align: center;
}

/* 2. FAQ 区域 */
.faq-section {
  padding: 64px 0;
  background-color: var(--color-cream);
  border-top: 1px solid var(--color-border);
}

.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item:hover {
  border-color: var(--color-primary-border);
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-dark);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-primary);
  transition: transform 0.25s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  display: none;
  padding: 0 24px 20px 24px;
  font-size: 14.5px;
  color: var(--color-gray-sub);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  display: block;
}

/* 3. 页脚区域 */
.site-footer {
  margin-top: auto;
  background-color: var(--color-dark-surface);
  color: #94a3b8;
  padding: 56px 0 28px 0;
  border-top: 1px solid #334155;
  font-size: 14px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand-title {
  color: #ffffff;
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-brand-desc {
  line-height: 1.65;
  color: #94a3b8;
  margin-bottom: 20px;
  font-size: 13.5px;
}

.footer-col-title {
  color: #ffffff;
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  transition: color 0.2s ease;
  font-size: 13.5px;
}

.footer-links a:hover {
  color: #ffffff;
  text-decoration: underline;
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid #1e293b;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: #64748b;
}

.footer-disclaimer {
  max-width: 100%;
  font-size: 12px;
  line-height: 1.6;
  color: #64748b;
  margin-bottom: 16px;
  padding: 12px 16px;
  background-color: #0b1120;
  border-radius: var(--radius-sm);
  border: 1px solid #1e293b;
}

/* ================= 移动端抽屉导航与响应式适配 ================= */
@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .header-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background-color: #ffffff;
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
  }

  .header-nav.is-open {
    display: flex;
  }

  .nav-link {
    width: 100%;
    padding: 10px 0;
    border-bottom: 1px solid #f1f5f9;
  }

  .hero-section {
    padding: 44px 0 36px 0;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

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

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

  .plan-card.popular {
    transform: none;
  }

  .feedback-card {
    padding: 24px 18px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* 防止极端小屏溢出与保护 */
@media (max-width: 380px) {
  .hero-title {
    font-size: 1.75rem;
  }
  .btn {
    padding: 10px 14px;
    font-size: 14px;
  }
}