/* ================================================================
   Earth API - 订阅页面 v2
   设计依据：DESIGN.md（亮色工作区 / 青色主色 / 琥珀价格色）
   差异化策略：让订阅页"静"下来，市场页"动"起来
     - Hero：单列居中编辑式 + 下方横向状态行动条（非双栏 + 玻璃右面板）
     - 挡位：纵向阶梯式对比表（每档一行，深度比较），非 3 列卡片网格
     - 视觉：静态左侧色条 + hover 描边，无聚光灯无品牌色泛光（让给市场页专属）
     - 玻璃：仅 Modal 保留，状态条纯白底
     - FAQ：双列网格（桌面），与市场页单列节奏区分
   ================================================================ */

:root {
  /* ===== 设计令牌（与 market.css 差异化） ===== */
  --sub-bg: #F8FAFC;
  --sub-bg-rgb: 248, 250, 252;
  --sub-surface: #FFFFFF;
  --sub-surface-rgb: 255, 255, 255;
  --sub-subtle: #F1F5F9;
  --sub-glass: rgba(255, 255, 255, 0.72);   /* 仅 Modal 用 */
  --sub-glass-strong: rgba(255, 255, 255, 0.94);

  --sub-text: #0F172A;
  --sub-text-rgb: 15, 23, 42;
  --sub-text-2: #475569;
  --sub-text-3: #64748B;
  --sub-placeholder: #94A3B8;

  --sub-accent: #0EA5E9;
  --sub-accent-rgb: 14, 165, 233;
  --sub-accent-hover: #0284C7;
  --sub-accent-soft: rgba(14, 165, 233, 0.08);
  /* 琥珀色优先级提升（扣费/额度/价格语义） */
  --sub-amber: #F59E0B;
  --sub-amber-rgb: 245, 158, 11;
  --sub-amber-hover: #D97706;
  --sub-amber-soft: rgba(245, 158, 11, 0.10);
  --sub-success: #10B981;
  --sub-success-soft: rgba(16, 185, 129, 0.10);
  --sub-error: #EF4444;
  --sub-error-soft: rgba(239, 68, 68, 0.10);

  --sub-border: #E2E8F0;
  --sub-border-strong: #CBD5E1;
  --sub-border-subtle: #EEF2F6;

  --sub-font-display: 'Outfit', 'Noto Sans SC', sans-serif;
  --sub-font-body: 'Outfit', 'Noto Sans SC', sans-serif;
  --sub-font-mono: 'JetBrains Mono', 'Noto Sans SC', monospace;

  /* 圆角更大（更"软"的购买氛围，与市场页 0.5/0.75/1/1.25rem 区分） */
  --sub-radius-sm: 0.5rem;
  --sub-radius-md: 0.75rem;
  --sub-radius-lg: 1rem;
  --sub-radius-xl: 1.5rem;
  --sub-radius-2xl: 2rem;
  --sub-radius-full: 999px;

  /* 阴影更柔（alpha 降低，与市场页区分） */
  --sub-shadow-xs: 0 1px 2px rgba(var(--sub-text-rgb), 0.03);
  --sub-shadow-sm: 0 1px 3px rgba(var(--sub-text-rgb), 0.04), 0 1px 2px rgba(var(--sub-text-rgb), 0.04);
  --sub-shadow-md: 0 3px 10px rgba(var(--sub-text-rgb), 0.05), 0 1px 3px rgba(var(--sub-text-rgb), 0.03);
  --sub-shadow-lg: 0 8px 20px rgba(var(--sub-text-rgb), 0.06), 0 2px 6px rgba(var(--sub-text-rgb), 0.03);
  --sub-shadow-xl: 0 16px 36px rgba(var(--sub-text-rgb), 0.10), 0 4px 12px rgba(var(--sub-text-rgb), 0.04);

  --sub-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --sub-ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --sub-ease-expo: cubic-bezier(0.19, 1, 0.22, 1);

  --sub-header-h: 68px;
  --sub-tier-color: var(--sub-accent-rgb);
}

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

html {
  color-scheme: light;
  scrollbar-gutter: stable;
}

body {
  font-family: var(--sub-font-body);
  background: var(--sub-bg);
  color: var(--sub-text);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

*, *::before, *::after {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
input, select { font-family: inherit; }

/* ================================================================
   背景：更克制的顶部光晕（无电路纹理，与市场页区分）
   ================================================================ */

.sub-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 40% at 50% 0%, rgba(var(--sub-accent-rgb), 0.045) 0%, transparent 60%),
    radial-gradient(ellipse 60% 30% at 50% 100%, rgba(var(--sub-amber-rgb), 0.03) 0%, transparent 60%),
    var(--sub-bg);
}

/* ================================================================
   页面容器
   ================================================================ */

.sub-main {
  position: relative;
  z-index: 1;
  padding-bottom: 96px;
}

.sub-container {
  width: min(1200px, 100%);
  margin: 0 auto;
  padding: 0 28px;
}

/* ================================================================
   Hero — ChatGPT 风格极简居中（仅标题 + 副标题）
   ================================================================ */

.sub-hero {
  padding: 48px 0 12px;
  text-align: center;
}

.sub-hero-title {
  font-family: var(--sub-font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.1;
  color: var(--sub-text);
  margin-bottom: 12px;
  text-wrap: balance;
  opacity: 0;
  animation: subHeroFade 0.6s var(--sub-ease) 0.1s forwards;
}

@keyframes subHeroFade {
  to { opacity: 1; }
}

.sub-hero-subtitle {
  font-size: 1.05rem;
  color: var(--sub-text-2);
  line-height: 1.6;
  max-width: 580px;
  margin: 0 auto;
  opacity: 0;
  animation: subHeroFade 0.7s var(--sub-ease) 0.25s forwards;
  text-wrap: pretty;
}

/* ================================================================
   当前订阅状态条（挡位列表上方，横向单行）
   ================================================================ */

.sub-status-bar {
  margin: 24px auto 8px;
  max-width: 1080px;
  background: var(--sub-surface);
  border: 1px solid var(--sub-border);
  border-radius: var(--sub-radius-lg);
  padding: 14px 22px;
  box-shadow: var(--sub-shadow-xs);
  opacity: 0;
  animation: subHeroFade 0.7s var(--sub-ease) 0.4s forwards;
}

.sub-status-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  align-items: center;
}

.sub-status-cell {
  min-width: 0;
  text-align: left;
  position: relative;
}

.sub-status-cell:not(:last-child)::after {
  content: '';
  position: absolute;
  right: -9px;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 28px;
  background: var(--sub-border);
}

.sub-status-label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--sub-text-3);
  margin-bottom: 3px;
  line-height: 1.2;
}

.sub-status-value {
  font-family: var(--sub-font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--sub-text);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  line-height: 1.25;
  word-break: break-word;
}

.sub-status-value.is-amber { color: var(--sub-amber-hover); }
.sub-status-value.is-accent { color: var(--sub-accent-hover); }

.sub-status-value-sub {
  font-size: 0.7rem;
  color: var(--sub-text-3);
  margin-top: 2px;
  font-family: var(--sub-font-body);
  font-weight: 400;
  line-height: 1.3;
}

/* 空状态 */
.sub-status-empty {
  text-align: center;
  padding: 6px 0;
}

.sub-status-empty-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--sub-text);
  margin-bottom: 3px;
}

.sub-status-empty-desc {
  font-size: 0.825rem;
  color: var(--sub-text-2);
  margin-bottom: 8px;
  line-height: 1.5;
}

.sub-status-empty-cta {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--sub-accent);
  transition: gap 0.2s var(--sub-ease);
}

.sub-status-empty-cta:hover { gap: 9px; }

/* ================================================================
   按钮
   ================================================================ */

.sub-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: var(--sub-radius-md);
  font-family: var(--sub-font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  transition: transform 0.2s var(--sub-ease), background-color 0.2s var(--sub-ease),
              box-shadow 0.25s var(--sub-ease), border-color 0.2s var(--sub-ease);
}

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

.sub-btn-primary {
  background: var(--sub-accent);
  color: #fff;
  box-shadow: 0 3px 10px rgba(var(--sub-accent-rgb), 0.28);
}

.sub-btn-primary:hover {
  background: var(--sub-accent-hover);
  box-shadow: 0 6px 18px rgba(var(--sub-accent-rgb), 0.36);
  transform: translateY(-1px);
}

.sub-btn-secondary {
  background: var(--sub-surface);
  color: var(--sub-text);
  border-color: var(--sub-border);
}

.sub-btn-secondary:hover {
  background: var(--sub-subtle);
  border-color: var(--sub-border-strong);
  transform: translateY(-1px);
}

.sub-btn-amber {
  background: var(--sub-amber);
  color: #fff;
  box-shadow: 0 3px 10px rgba(var(--sub-amber-rgb), 0.28);
}

.sub-btn-amber:hover {
  background: var(--sub-amber-hover);
  box-shadow: 0 6px 18px rgba(var(--sub-amber-rgb), 0.36);
  transform: translateY(-1px);
}

.sub-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* ================================================================
   章节标题（通用）
   ================================================================ */

.sub-section {
  padding: 48px 0;
}

.sub-section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 36px;
}

.sub-section-eyebrow {
  display: inline-block;
  padding: 5px 12px;
  border-radius: var(--sub-radius-full);
  background: var(--sub-amber-soft);
  color: var(--sub-amber-hover);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.sub-section-title {
  font-family: var(--sub-font-display);
  font-size: clamp(1.75rem, 3.2vw, 2.4rem);
  font-weight: 700;
  color: var(--sub-text);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 12px;
  text-wrap: balance;
}

.sub-section-desc {
  font-size: 1rem;
  color: var(--sub-text-2);
  line-height: 1.65;
  text-wrap: pretty;
}

/* ================================================================
   挡位卡片 — ChatGPT 风格并列卡片（每张含完整功能列表）
   ================================================================ */

/* 订阅卡片列表：flex-wrap 自然换行，避免 1fr 拉伸导致堆挤 */
.sub-tier-list {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  justify-content: center;
  align-items: stretch;
}

.sub-tier-card {
  position: relative;
  display: flex;
  flex-direction: column;
  flex: 1 1 280px;        /* 基础 280px，允许伸缩 */
  min-width: 260px;        /* 低于此值强制换行 */
  max-width: 360px;        /* 限制单卡片最大宽度，避免过宽 */
  padding: 28px 24px 24px;
  background: var(--sub-surface);
  border: 1px solid var(--sub-border);
  border-radius: var(--sub-radius-xl);
  box-shadow: var(--sub-shadow-xs);
  transition: border-color 0.25s var(--sub-ease), box-shadow 0.25s var(--sub-ease), transform 0.25s var(--sub-ease);
  --tier-color: var(--sub-accent-rgb);
}

.sub-tier-card:hover {
  border-color: rgba(var(--tier-color), 0.4);
  box-shadow: var(--sub-shadow-sm);
  transform: translateY(-2px);
}

/* 已激活挡位：琥珀色边框 + 浅琥珀背景 */
.sub-tier-card.is-active {
  --tier-color: var(--sub-amber-rgb);
  background: linear-gradient(180deg, rgba(var(--sub-amber-rgb), 0.04) 0%, var(--sub-surface) 40%);
  border-color: rgba(var(--sub-amber-rgb), 0.4);
  box-shadow:
    0 0 0 1px rgba(var(--sub-amber-rgb), 0.1),
    var(--sub-shadow-sm);
}

/* 推荐挡位：主色边框 + 浅主色背景 */
.sub-tier-card.is-featured {
  background: linear-gradient(180deg, rgba(var(--tier-color), 0.04) 0%, var(--sub-surface) 40%);
  border-color: rgba(var(--tier-color), 0.35);
}

/* 顶部色条（替代左侧色条，更适合卡片） */
.sub-tier-card::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: rgb(var(--tier-color));
  border-radius: var(--sub-radius-xl) var(--sub-radius-xl) 0 0;
}

.sub-tier-card.is-active::before {
  background: var(--sub-amber);
}

/* 徽章 */
.sub-tier-badge {
  position: absolute;
  top: 14px;
  right: 14px;
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: var(--sub-radius-full);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: var(--sub-accent);
  color: #fff;
}

.sub-tier-badge.is-active {
  background: var(--sub-amber);
}

/* 挡位名 */
.sub-tier-name {
  font-family: var(--sub-font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--sub-text);
  letter-spacing: -0.015em;
  line-height: 1.2;
  margin-bottom: 6px;
}

/* 挡位简述 */
.sub-tier-tagline {
  font-size: 0.85rem;
  color: var(--sub-text-3);
  line-height: 1.4;
  margin-bottom: 18px;
  min-height: 2.4em;
}

/* 价格区 */
.sub-tier-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 4px;
}

.sub-tier-price-symbol {
  font-family: var(--sub-font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--sub-text-2);
  line-height: 1;
}

.sub-tier-price-amount {
  font-family: var(--sub-font-display);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--sub-text);
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.sub-tier-card.is-active .sub-tier-price-amount {
  color: var(--sub-amber-hover);
}

.sub-tier-price-period {
  font-size: 0.78rem;
  color: var(--sub-text-3);
  font-weight: 500;
}

.sub-tier-price-note {
  font-size: 0.78rem;
  color: var(--sub-text-3);
  margin-bottom: 20px;
}

/* CTA 按钮 */
.sub-tier-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  height: 42px;
  border: 1px solid rgba(var(--tier-color), 0.3);
  border-radius: var(--sub-radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
  background: rgb(var(--tier-color));
  cursor: pointer;
  transition: background-color 0.2s var(--sub-ease), transform 0.15s var(--sub-ease),
              box-shadow 0.2s var(--sub-ease);
  margin-bottom: 22px;
}

.sub-tier-cta:hover {
  box-shadow: 0 4px 12px rgba(var(--tier-color), 0.28);
  transform: translateY(-1px);
}

.sub-tier-cta:active { transform: scale(0.97); }

.sub-tier-cta.is-active {
  background: var(--sub-subtle);
  color: var(--sub-text-3);
  border-color: var(--sub-border);
  cursor: default;
  box-shadow: none;
}

.sub-tier-cta.is-active:hover {
  transform: none;
  box-shadow: none;
}

/* 功能列表（ChatGPT 风格 bullet 列表） */
.sub-tier-features {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.sub-tier-features-title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--sub-text-3);
  margin-bottom: 4px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--sub-border-subtle);
}

.sub-tier-feature {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.825rem;
  color: var(--sub-text-2);
  line-height: 1.5;
}

.sub-tier-feature svg {
  flex-shrink: 0;
  width: 14px;
  height: 14px;
  color: rgb(var(--tier-color));
  margin-top: 2px;
}

.sub-tier-card.is-active .sub-tier-feature svg {
  color: var(--sub-amber);
}

/* 空状态 */
.sub-empty {
  padding: 56px 24px;
  text-align: center;
  background: var(--sub-surface);
  border: 1px dashed var(--sub-border-strong);
  border-radius: var(--sub-radius-xl);
  grid-column: 1 / -1;
}

.sub-empty-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--sub-subtle);
  color: var(--sub-text-3);
}

.sub-empty-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--sub-text);
  margin-bottom: 6px;
}

.sub-empty-desc {
  font-size: 0.875rem;
  color: var(--sub-text-2);
  max-width: 420px;
  margin: 0 auto;
  line-height: 1.55;
}

/* ================================================================
   挡位对比矩阵
   ================================================================ */

.sub-compare-section {
  padding: 32px 0 48px;
}

.sub-compare {
  background: var(--sub-surface);
  border: 1px solid var(--sub-border);
  border-radius: var(--sub-radius-xl);
  overflow: hidden;
  box-shadow: var(--sub-shadow-sm);
}

.sub-compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.sub-compare-table thead {
  background: var(--sub-subtle);
}

.sub-compare-table th,
.sub-compare-table td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: middle;
  border-bottom: 1px solid var(--sub-border);
}

.sub-compare-table th {
  font-weight: 600;
  color: var(--sub-text);
  font-size: 0.825rem;
  letter-spacing: 0.01em;
}

.sub-compare-table th:not(:first-child),
.sub-compare-table td:not(:first-child) {
  text-align: center;
}

.sub-compare-table tbody tr:hover {
  background: var(--sub-subtle);
}

.sub-compare-table tbody tr:last-child td {
  border-bottom: none;
}

.sub-compare-feature {
  font-weight: 500;
  color: var(--sub-text);
}

.sub-compare-value {
  color: var(--sub-text-2);
  font-variant-numeric: tabular-nums;
}

.sub-compare-value.is-yes {
  color: var(--sub-success);
  font-weight: 600;
}

.sub-compare-value.is-no {
  color: var(--sub-text-3);
}

.sub-compare-value.is-price {
  font-family: var(--sub-font-mono);
  font-weight: 600;
  color: var(--sub-amber-hover);
}

/* 已激活列高亮 */
.sub-compare-table th.is-active,
.sub-compare-table td.is-active {
  background: rgba(var(--sub-amber-rgb), 0.04);
}

.sub-compare-table th.is-active {
  color: var(--sub-amber-hover);
  position: relative;
}

.sub-compare-table th.is-active::after {
  content: '当前';
  display: inline-block;
  margin-left: 6px;
  padding: 2px 7px;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  background: var(--sub-amber);
  color: #fff;
  border-radius: var(--sub-radius-full);
  vertical-align: middle;
}

/* ================================================================
   FAQ 双列网格（与市场页单列节奏区分）
   ================================================================ */

.sub-faq-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  max-width: 1080px;
  margin: 0 auto;
}

.sub-faq-item {
  background: var(--sub-surface);
  border: 1px solid var(--sub-border);
  border-radius: var(--sub-radius-lg);
  overflow: hidden;
  transition: border-color 0.2s var(--sub-ease), box-shadow 0.2s var(--sub-ease);
}

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

.sub-faq-item.is-open {
  border-color: rgba(var(--sub-amber-rgb), 0.35);
  box-shadow: 0 3px 10px rgba(var(--sub-amber-rgb), 0.06);
}

.sub-faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 20px;
  background: transparent;
  border: none;
  text-align: left;
  font-family: var(--sub-font-body);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--sub-text);
  cursor: pointer;
  transition: background-color 0.2s var(--sub-ease);
}

.sub-faq-q:hover { background: var(--sub-subtle); }

.sub-faq-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--sub-amber-hover);
  transition: transform 0.3s var(--sub-ease);
}

.sub-faq-item.is-open .sub-faq-icon {
  transform: rotate(45deg);
}

.sub-faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--sub-ease);
}

.sub-faq-a-inner {
  padding: 0 20px 18px;
  font-size: 0.875rem;
  color: var(--sub-text-2);
  line-height: 1.65;
}

/* ================================================================
   底部 CTA
   ================================================================ */

.sub-cta-band {
  margin-top: 24px;
  padding: 48px 40px;
  border-radius: var(--sub-radius-2xl);
  background: var(--sub-surface);
  border: 1px solid var(--sub-border);
  box-shadow: var(--sub-shadow-md);
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* 用静态琥珀色边角点缀替代市场页的双侧径向渐变 */
.sub-cta-band::before {
  content: '';
  position: absolute;
  top: -40px;
  right: -40px;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle, rgba(var(--sub-amber-rgb), 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.sub-cta-title {
  position: relative;
  font-family: var(--sub-font-display);
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  font-weight: 700;
  color: var(--sub-text);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.sub-cta-desc {
  position: relative;
  font-size: 0.975rem;
  color: var(--sub-text-2);
  margin-bottom: 24px;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

.sub-cta-actions {
  position: relative;
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

/* ================================================================
   确认弹窗（保留玻璃拟态）
   ================================================================ */

.sub-modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.25s var(--sub-ease), visibility 0.25s var(--sub-ease);
}

.sub-modal.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.sub-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(var(--sub-text-rgb), 0.35);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.sub-modal-window {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 460px;
  background: var(--sub-glass-strong);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--sub-radius-xl);
  padding: 28px;
  box-shadow: var(--sub-shadow-xl);
  transform: translateY(16px) scale(0.96);
  transition: transform 0.3s var(--sub-ease-expo);
}

.sub-modal.is-open .sub-modal-window {
  transform: translateY(0) scale(1);
}

.sub-modal-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}

.sub-modal-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--sub-radius-md);
  background: var(--sub-amber-soft);
  color: var(--sub-amber-hover);
}

.sub-modal-title {
  font-family: var(--sub-font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--sub-text);
  margin-bottom: 4px;
  letter-spacing: -0.01em;
}

.sub-modal-desc {
  font-size: 0.875rem;
  color: var(--sub-text-2);
  line-height: 1.55;
}

.sub-modal-desc strong {
  color: var(--sub-amber-hover);
  font-variant-numeric: tabular-nums;
}

.sub-modal-field {
  margin-top: 18px;
}

.sub-modal-field-label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--sub-text-2);
  letter-spacing: 0.02em;
}

.sub-modal-input {
  width: 100%;
  height: 44px;
  padding: 0 14px;
  border: 1px solid var(--sub-border);
  border-radius: var(--sub-radius-md);
  background: var(--sub-surface);
  font-family: var(--sub-font-body);
  font-size: 0.95rem;
  color: var(--sub-text);
  transition: border-color 0.2s var(--sub-ease), box-shadow 0.2s var(--sub-ease);
}

.sub-modal-input::placeholder {
  color: var(--sub-placeholder);
}

.sub-modal-input:focus {
  outline: none;
  border-color: var(--sub-amber);
  box-shadow: 0 0 0 3px rgba(var(--sub-amber-rgb), 0.15);
}

.sub-modal-tip {
  margin-top: 12px;
  min-height: 22px;
  font-size: 0.825rem;
  color: var(--sub-amber-hover);
  line-height: 1.5;
}

.sub-modal-tip.is-info {
  color: var(--sub-accent-hover);
}

.sub-modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 22px;
}

.sub-modal-btn {
  flex: 1;
  height: 44px;
  border: none;
  border-radius: var(--sub-radius-md);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s var(--sub-ease), transform 0.15s var(--sub-ease);
}

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

.sub-modal-btn-primary {
  background: var(--sub-amber);
  color: #fff;
  box-shadow: 0 3px 10px rgba(var(--sub-amber-rgb), 0.28);
}

.sub-modal-btn-primary:hover {
  background: var(--sub-amber-hover);
  box-shadow: 0 5px 14px rgba(var(--sub-amber-rgb), 0.36);
}

.sub-modal-btn-secondary {
  background: var(--sub-subtle);
  color: var(--sub-text);
}

.sub-modal-btn-secondary:hover {
  background: var(--sub-border);
}

.sub-modal-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

/* ================================================================
   入场动画（IntersectionObserver 触发）
   ================================================================ */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--sub-ease), transform 0.7s var(--sub-ease);
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--sub-ease), transform 0.6s var(--sub-ease);
}

.reveal-stagger.in-view > * {
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger.in-view > *:nth-child(1) { transition-delay: 0.05s; }
.reveal-stagger.in-view > *:nth-child(2) { transition-delay: 0.13s; }
.reveal-stagger.in-view > *:nth-child(3) { transition-delay: 0.21s; }
.reveal-stagger.in-view > *:nth-child(4) { transition-delay: 0.29s; }
.reveal-stagger.in-view > *:nth-child(5) { transition-delay: 0.37s; }

/* ================================================================
   响应式
   ================================================================ */

@media (max-width: 1100px) {
  /* flex-wrap 自动处理换行，此处仅调整卡片伸缩基准 */
  .sub-tier-card {
    flex-basis: 260px;
  }
  .sub-faq-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .sub-container { padding: 0 18px; }
  .sub-hero { padding: 32px 0 8px; }
  .sub-section { padding: 36px 0; }
  /* 小屏单列居中 */
  .sub-tier-list {
    flex-direction: column;
    align-items: center;
  }
  .sub-tier-card {
    flex: 0 0 auto;
    width: 100%;
    max-width: 420px;
  }
  .sub-status-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }
  .sub-status-cell:nth-child(2)::after { display: none; }
  .sub-compare-table { font-size: 0.78rem; }
  .sub-compare-table th,
  .sub-compare-table td { padding: 10px 10px; }
  .sub-cta-band { padding: 32px 22px; }
  .sub-modal-window { padding: 22px; }
}

@media (max-width: 560px) {
  .sub-status-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .sub-status-cell::after { display: none !important; }
  .sub-modal-actions { flex-direction: column-reverse; }
  .sub-modal-btn { width: 100%; }
}

/* ================================================================
   Reduced Motion
   ================================================================ */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal, .reveal-stagger > * {
    opacity: 1;
    transform: none;
  }
}