/* ==========================================================================
   胖虎AI 模型与价格页样式表 (Gemini-style Premium Redesign)
   ========================================================================== */

* {
  box-sizing: border-box;
}

:root {
  color-scheme: light;
  
  /* 基础调色板 (Style A - 通透亮色 / airy) */
  --bg: #F4F7FC;
  --bg2: #EDF2FA;
  --card: #FFFFFF;
  --rail: #FBFCFE;
  --surface: #FFFFFF;
  --surface-2: #EDF2FA;
  --surface-3: #E2E9F4;
  --text: #1B1D21;
  --muted: #5C636B;
  --subtle: #8A9198;
  --hair: rgba(26, 54, 110, 0.09);
  --hair2: rgba(26, 54, 110, 0.06);
  --blue: #1A73E8;
  --violet: #7C5CD6;
  --magenta: #C2417F;
  --cyan: #0E7F9E;
  
  --spark-blue: #4285F4;
  --spark-violet: #9B72CB;
  --spark-coral: #D96570;
  --spark-magenta: #FF7AC8;
  --spark-cyan: #72E4FF;
  --on-spark: #FFFFFF;
  
  --g-spark: linear-gradient(135deg, var(--spark-blue), var(--spark-violet) 55%, var(--spark-coral));
  --g-name: linear-gradient(96deg, #1A73E8, #7C5CD6 55%, #C2417F);
  --g-bloom: radial-gradient(ellipse 62% 46% at 50% 0%, rgba(66, 133, 244, 0.18), transparent 70%);
  --g-aura: radial-gradient(ellipse 50% 50% at 50% 42%, rgba(66, 133, 244, 0.22), transparent 70%);
  
  --blue-c: #E7F0FE;
  --blue-t: #124FA6;
  --grn-c: #E3F3E8;
  --grn-t: #1E6A34;
  --pur-c: #F0E9FD;
  --pur-t: #5A34A6;
  --cor-c: #FCE7E4;
  --cor-t: #B23B2E;
  --warn-c: #FEF3D9;
  --warn-t: #8A5A00;
  
  --sh-sm: 0 1px 2px rgba(30, 50, 110, 0.06);
  --sh-md: 0 6px 20px rgba(40, 70, 150, 0.08);
  --sh-lg: 0 18px 48px rgba(40, 80, 170, 0.16), 0 2px 8px rgba(30, 50, 110, 0.06);
  
  --edge: none;
  --outline: rgba(26, 54, 110, 0.12);
  
  /* 基础系统变量 */
  --r-full: 999px;
  --r-lg: 28px;
  --r-md: 16px;
  --r-sm: 12px;
  --r-xs: 8px;
  --ease: cubic-bezier(.2, 0, 0, 1);
  --spring: cubic-bezier(.34, 1.56, .64, 1);
  --font: Inter, 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  --mono: 'Roboto Mono', ui-monospace, monospace;
  
  --signature-gradient: var(--g-name);
  --signature-glow: var(--g-bloom);
  --topbar-bg: rgba(255, 255, 255, 0.82);
  --ph-btn-reg-color: #FFFFFF;
  --ph-btn-reg-bg: #1B1D21;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    
    /* 基础调色板 (Style B - Gemini 纯黑渐变光 / pure-black gradient light) */
    --bg: #000000;
    --bg2: #050507;
    --card: rgba(18, 19, 24, 0.86);
    --rail: rgba(9, 10, 14, 0.88);
    --surface: rgba(16, 17, 22, 0.88);
    --surface-2: rgba(23, 25, 34, 0.90);
    --surface-3: rgba(33, 36, 49, 0.92);
    --text: #EAEBED;
    --muted: #9AA0A6;
    --subtle: #6E7378;
    --hair: rgba(255, 255, 255, 0.08);
    --hair2: rgba(255, 255, 255, 0.05);
    --blue: #8AB4F8;
    --violet: #B79CFF;
    --magenta: #FF7AC8;
    --cyan: #72E4FF;
    
    --spark-blue: #4285F4;
    --spark-violet: #8A5CFF;
    --on-spark: #FFFFFF;
    
    --g-spark: linear-gradient(100deg, #4285F4 0%, #8A5CFF 35%, #FF7AC8 68%, #72E4FF 100%);
    --g-name: linear-gradient(96deg, #8AB4F8, #B79CFF 45%, #FF7AC8 78%, #72E4FF);
    --g-bloom: radial-gradient(ellipse 62% 46% at 50% 0%, rgba(66, 133, 244, 0.34), transparent 70%);
    --g-aura: radial-gradient(ellipse 50% 50% at 50% 42%, rgba(66, 133, 244, 0.42), transparent 70%);
    
    --blue-c: rgba(138, 180, 248, 0.14);
    --blue-t: #AECBFB;
    --grn-c: rgba(147, 211, 166, 0.13);
    --grn-t: #93D3A6;
    --pur-c: rgba(183, 156, 255, 0.15);
    --pur-t: #CDB6F2;
    --cor-c: rgba(255, 122, 200, 0.14);
    --cor-t: #FFB5DD;
    --warn-c: rgba(240, 206, 122, 0.13);
    --warn-t: #F0CE7A;
    
    --sh-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --sh-md: 0 8px 24px rgba(0, 0, 0, 0.45);
    --sh-lg: 0 20px 50px rgba(0, 0, 0, 0.55);
    
    --edge: inset 0 1px 0 rgba(255, 255, 255, 0.05);
    --outline: rgba(255, 255, 255, 0.09);
    
    --g-ambient:
      radial-gradient(circle at 18% 12%, rgba(66, 133, 244, 0.42), transparent 34%),
      radial-gradient(circle at 78% 0%, rgba(183, 156, 255, 0.36), transparent 30%),
      radial-gradient(circle at 52% 88%, rgba(255, 122, 200, 0.24), transparent 36%),
      radial-gradient(circle at 90% 72%, rgba(114, 228, 255, 0.18), transparent 28%);
    
    --signature-gradient: var(--g-name);
    --signature-glow: var(--g-bloom);
    --topbar-bg: rgba(16, 17, 22, 0.82);
    --ph-btn-reg-color: #202124;
    --ph-btn-reg-bg: #E8EAED;
  }
}

/* ==========================================================================
   页面基础框架
   ========================================================================== */

html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-variant-numeric: tabular-nums;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), opacity 0.2s var(--ease), transform 0.2s var(--ease);
}

button, input, select {
  font-family: inherit;
  margin: 0;
}

/* ==========================================================================
   环境光 & 神经网络连线背景
   ========================================================================== */

.gemini-ambient {
  position: fixed;
  inset: -30%;
  z-index: -2;
  pointer-events: none;
  background: var(--g-ambient), var(--bg);
  filter: blur(42px) saturate(1.16);
  opacity: 0.82;
  animation: geminiAmbientDrift 20s ease-in-out infinite alternate;
  display: none;
}

@media (prefers-color-scheme: dark) {
  .gemini-ambient {
    display: block;
  }
}

@keyframes geminiAmbientDrift {
  0% { transform: translate3d(-6%, -4%, 0) scale(1); opacity: 0.66; }
  50% { transform: translate3d(5%, 4%, 0) scale(1.08); opacity: 0.88; }
  100% { transform: translate3d(8%, -6%, 0) scale(1.04); opacity: 0.74; }
}

@media (prefers-reduced-motion: reduce) {
  .gemini-ambient { animation: none; opacity: 0.58; }
}

.space-canvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.15;
  mix-blend-mode: screen;
}

@media (prefers-color-scheme: dark) {
  .space-canvas {
    opacity: 0.35;
  }
}

/* ==========================================================================
   导航栏 (Topbar)
   ========================================================================== */

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  display: flex;
  align-items: center;
  padding: 0 32px;
  background: var(--topbar-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--hair2);
  z-index: 100;
  transition: background 0.3s var(--ease), border 0.3s var(--ease);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--signature-gradient);
  box-shadow: 0 2px 8px rgba(66, 133, 244, 0.25);
  position: relative;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 8px;
  box-shadow: var(--edge);
}

.nav {
  display: flex;
  gap: 32px;
  margin-left: 48px;
}

.nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  position: relative;
  padding: 4px 0;
}

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

.nav a.active {
  color: var(--blue);
  font-weight: 600;
}

.nav a.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--blue);
  border-radius: var(--r-full);
}

@media (prefers-color-scheme: dark) {
  .nav a.active {
    color: var(--cyan);
  }
  .nav a.active::after {
    background: var(--cyan);
  }
}

.top-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
}

.login-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  padding: 8px 16px;
  border-radius: var(--r-full);
}

.login-link:hover {
  background: var(--surface-3);
}

.register-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--ph-btn-reg-color);
  background: var(--ph-btn-reg-bg);
  padding: 8px 20px;
  border-radius: var(--r-full);
  box-shadow: var(--sh-sm);
}

.register-link:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.register-link:active {
  transform: translateY(0);
}

/* ==========================================================================
   页面容器 & 主布局
   ========================================================================== */

.pricing-shell {
  width: min(1200px, calc(100vw - 48px));
  margin: 0 auto;
  padding: 110px 0 80px;
  position: relative;
  z-index: 10;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.pricing-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 40px;
  align-items: center;
  margin-bottom: 40px;
}

.hero-content {
  display: flex;
  flex-direction: column;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--blue);
  text-transform: uppercase;
}

@media (prefers-color-scheme: dark) {
  .eyebrow {
    color: var(--cyan);
  }
}

.eyebrow-line {
  width: 16px;
  height: 1px;
  background: currentColor;
}

.hero-title {
  margin: 12px 0 16px;
  font-size: clamp(36px, 4.5vw, 48px);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--text);
}

.gradient-text {
  background: var(--signature-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 600;
}

.hero-sub {
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--muted);
  max-width: 680px;
}

.pricing-quick-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.ghost-button, .primary-button {
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border-radius: var(--r-full);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
}

.primary-button {
  color: var(--on-spark);
  background: var(--g-spark);
  box-shadow: 0 4px 14px rgba(66, 133, 244, 0.25);
  transition: transform 0.2s var(--spring), box-shadow 0.2s var(--ease);
}

.primary-button:hover {
  transform: scale(1.02);
  box-shadow: 0 6px 20px rgba(66, 133, 244, 0.35);
}

.primary-button:active {
  transform: scale(0.98);
}

.ghost-button {
  border: 1px solid var(--outline);
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--sh-sm);
}

.ghost-button:hover {
  background: var(--surface-2);
  border-color: var(--muted);
}

/* 状态统计卡片 */
.pricing-status-card {
  position: relative;
  padding: 24px;
  border-radius: var(--r-lg);
  background: var(--surface);
  border: 1px solid var(--hair);
  box-shadow: var(--sh-md);
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow: hidden;
}

.status-glow {
  position: absolute;
  top: 0;
  right: 0;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--g-aura);
  filter: blur(20px);
  opacity: 0.6;
  pointer-events: none;
}

.status-meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  z-index: 2;
}

.status-badge, .version-badge {
  display: inline-flex;
  align-items: center;
  width: max-content;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--r-full);
}

.status-badge {
  background: var(--blue-c);
  color: var(--blue-t);
}

@media (prefers-color-scheme: dark) {
  .status-badge {
    background: rgba(138, 180, 248, 0.15);
    color: var(--blue);
  }
}

.version-badge {
  background: var(--pur-c);
  color: var(--pur-t);
}

@media (prefers-color-scheme: dark) {
  .version-badge {
    background: rgba(183, 156, 255, 0.15);
    color: var(--violet);
  }
}

.status-desc {
  margin: 0;
  font-size: 12px;
  color: var(--subtle);
  position: relative;
  z-index: 2;
}

/* ==========================================================================
   价格摘要 Stat Grid
   ========================================================================== */

.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 48px;
}

.stat-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  border-radius: var(--r-md);
  background: var(--surface);
  border: 1px solid var(--hair);
  box-shadow: var(--sh-sm);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--sh-md);
}

.stat-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue);
}

@media (prefers-color-scheme: dark) {
  .stat-icon {
    color: var(--cyan);
    background: var(--surface-3);
  }
}

.stat-icon span {
  font-variation-settings: 'FILL' 0, 'wght' 300, 'GRAD' 0, 'opsz' 24;
}

.stat-body {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.stat-body span {
  font-size: 12px;
  color: var(--muted);
  font-weight: 500;
  margin-bottom: 2px;
}

.stat-body strong {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: var(--mono);
}

/* ==========================================================================
   推荐卡片 Panel
   ========================================================================== */

.recommend-panel {
  margin-bottom: 48px;
}

.panel-header {
  margin-bottom: 20px;
}

.panel-eyebrow {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--subtle);
  text-transform: uppercase;
  display: block;
  margin-bottom: 4px;
}

.panel-header h2 {
  font-size: 24px;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--text);
}

.panel-desc {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
  max-width: 780px;
}

.recommend-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.recommend-card {
  padding: 24px;
  border-radius: var(--r-md);
  background: var(--surface);
  border: 1px solid var(--hair);
  box-shadow: var(--sh-sm);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), border-color 0.2s var(--ease);
  position: relative;
  overflow: hidden;
  min-height: 200px;
}

.recommend-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--hair);
  transition: background 0.2s var(--ease);
}

.recommend-card:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: var(--sh-lg);
  border-color: var(--outline);
}

.recommend-card:hover::before {
  background: var(--g-spark);
}

.recommend-card span {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--blue);
  text-transform: uppercase;
}

@media (prefers-color-scheme: dark) {
  .recommend-card span {
    color: var(--violet);
  }
}

.recommend-card strong {
  font-size: 20px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: -0.01em;
}

.recommend-card p {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  margin: 0;
  flex-grow: 1;
}

.recommend-card small {
  font-size: 13px;
  font-weight: 600;
  color: var(--blue);
  font-family: var(--mono);
  margin-top: 8px;
  display: block;
}

@media (prefers-color-scheme: dark) {
  .recommend-card small {
    color: var(--cyan);
  }
}

/* Loading Card */
.recommend-card.loading-card, .recommend-card.error {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px;
  color: var(--subtle);
  font-weight: 500;
  min-height: 150px;
}

/* ==========================================================================
   筛选工具栏 (Tool Panel)
   ========================================================================== */

.tool-panel {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 20px;
  padding: 16px 20px;
  border-radius: var(--r-full);
  background: var(--surface);
  border: 1px solid var(--hair);
  box-shadow: var(--sh-sm);
  margin-bottom: 24px;
  align-items: center;
}

.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
}

.search-icon {
  position: absolute;
  left: 18px;
  color: var(--subtle);
  pointer-events: none;
  font-variation-settings: 'wght' 300, 'opsz' 20;
}

.tool-panel input[type="search"] {
  width: 100%;
  height: 44px;
  padding: 0 16px 0 46px;
  border-radius: var(--r-full);
  border: 1px solid var(--hair);
  background: var(--bg2);
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.tool-panel input[type="search"]:focus {
  background: var(--surface);
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.15);
}

@media (prefers-color-scheme: dark) {
  .tool-panel input[type="search"]:focus {
    border-color: var(--cyan);
    box-shadow: 0 0 0 3px rgba(114, 228, 255, 0.15);
  }
}

.filter-group {
  display: flex;
  gap: 12px;
}

.select-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.select-icon {
  position: absolute;
  left: 16px;
  color: var(--subtle);
  pointer-events: none;
  font-size: 18px;
  font-variation-settings: 'wght' 300, 'opsz' 18;
}

.tool-panel select {
  height: 44px;
  padding: 0 36px 0 42px;
  border-radius: var(--r-full);
  border: 1px solid var(--hair);
  background: var(--bg2);
  color: var(--text);
  font-size: 13px;
  font-weight: 500;
  outline: none;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

/* 下拉箭头自定义 */
.select-wrap::after {
  content: "keyboard_arrow_down";
  font-family: 'Material Symbols Rounded';
  font-variation-settings: 'wght' 300;
  position: absolute;
  right: 16px;
  color: var(--subtle);
  pointer-events: none;
  font-size: 18px;
}

.tool-panel select:focus {
  background: var(--surface);
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.15);
}

@media (prefers-color-scheme: dark) {
  .tool-panel select:focus {
    border-color: var(--cyan);
    box-shadow: 0 0 0 3px rgba(114, 228, 255, 0.15);
  }
}

/* ==========================================================================
   模型列表 (Models List Panel)
   ========================================================================== */

.models-panel {
  background: var(--surface);
  border: 1px solid var(--hair);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-md);
  overflow: hidden;
  margin-bottom: 48px;
  position: relative;
}

.models-panel::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--r-lg);
  box-shadow: var(--edge);
  pointer-events: none;
}

.models-panel-head {
  padding: 32px;
  border-bottom: 1px solid var(--hair);
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--bg2);
}

.model-list {
  display: flex;
  flex-direction: column;
}

.model-row {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(360px, 1fr);
  gap: 40px;
  padding: 28px 32px;
  border-bottom: 1px solid var(--hair);
  align-items: center;
  transition: background-color 0.2s var(--ease);
}

.model-row:last-child {
  border-bottom: 0;
}

.model-row:hover {
  background-color: var(--bg2);
}

.model-main {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.model-name-line {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.model-name-line strong {
  font-size: 20px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: -0.01em;
  overflow-wrap: anywhere;
}

.model-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--r-full);
  background: var(--blue-c);
  color: var(--blue-t);
  font-family: var(--font);
}

@media (prefers-color-scheme: dark) {
  .model-badge {
    background: rgba(138, 180, 248, 0.15);
    color: var(--blue);
  }
}

.model-main p {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--muted);
}

.scenario-list, .pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.scenario-pill, .pill, .endpoint {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--r-full);
}

/* 场景标签：微暖色调 */
.scenario-pill {
  background: var(--cor-c);
  color: var(--cor-t);
}

@media (prefers-color-scheme: dark) {
  .scenario-pill {
    background: rgba(255, 122, 200, 0.14);
    color: var(--magenta);
  }
}

/* 通用特征标签：微冷色调 */
.pill {
  background: var(--blue-c);
  color: var(--blue-t);
  border: 1px solid rgba(26, 54, 110, 0.05);
}

@media (prefers-color-scheme: dark) {
  .pill {
    background: rgba(114, 228, 255, 0.14);
    color: var(--cyan);
    border: none;
  }
}

/* 接口标签：中性紫色调 */
.endpoint {
  background: var(--pur-c);
  color: var(--pur-t);
}

@media (prefers-color-scheme: dark) {
  .endpoint {
    background: rgba(183, 156, 255, 0.14);
    color: var(--violet);
  }
}

.model-meta {
  margin-top: 14px;
  font-size: 12px;
  color: var(--subtle);
  display: flex;
  gap: 16px;
}

/* 价格展示卡片网格 */
.model-price-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.model-price {
  background: var(--bg2);
  border: 1px solid var(--hair2);
  border-radius: var(--r-sm);
  padding: 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.model-price:hover {
  background: var(--surface);
  border-color: var(--outline);
}

.model-price span:first-child {
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.model-price strong {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  font-family: var(--mono);
}

.model-price span:last-child {
  font-size: 11px;
  color: var(--subtle);
}

/* Loading & Empty State */
.loading, .empty, .error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 64px 32px;
  color: var(--muted);
  gap: 16px;
  font-size: 14px;
}

.shimmer-loader {
  width: 32px;
  height: 32px;
  border: 2px solid var(--hair);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ==========================================================================
   新手说明 & 词汇表 Section (Bottom FAQ)
   ========================================================================== */

.guide-and-faq {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 40px;
  margin-top: 64px;
  border-top: 1px solid var(--hair);
  padding-top: 48px;
}

.beginner-panel {
  display: flex;
  flex-direction: column;
}

.beginner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 20px;
}

.guide-card {
  padding: 20px;
  border-radius: var(--r-md);
  background: var(--surface);
  border: 1px solid var(--hair);
  box-shadow: var(--sh-sm);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 16px;
}

.card-icon-wrap {
  grid-row: 1 / 3;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--bg2);
  color: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
}

@media (prefers-color-scheme: dark) {
  .card-icon-wrap {
    color: var(--cyan);
  }
}

.guide-card h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.guide-card strong {
  font-size: 13px;
  font-weight: 500;
  color: var(--subtle);
  margin-bottom: 6px;
}

.guide-card p {
  grid-column: 2;
  margin: 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

/* 词汇表 */
.glossary-panel {
  display: flex;
  flex-direction: column;
}

.glossary-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 20px;
}

.glossary-card {
  padding: 16px;
  border-radius: var(--r-sm);
  background: var(--surface);
  border: 1px solid var(--hair);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.glossary-card strong {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.glossary-card p {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

/* ==========================================================================
   页脚 (Footer)
   ========================================================================== */

.footer {
  width: 100%;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-top: 1px solid var(--hair2);
  background: var(--bg);
  position: relative;
  z-index: 10;
  padding: 0 24px;
}

.footer span {
  font-size: 13px;
  color: var(--subtle);
  text-align: center;
}

/* ==========================================================================
   响应式适配 (Responsive Styles)
   ========================================================================== */

@media (max-width: 1120px) {
  .topbar {
    padding: 0 24px;
  }
  
  .pricing-shell {
    width: calc(100vw - 32px);
    padding-top: 96px;
  }
  
  .pricing-head {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .pricing-status-card {
    max-width: 380px;
  }
  
  .summary-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .recommend-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .model-row {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 24px;
  }
  
  .guide-and-faq {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .glossary-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .topbar {
    padding: 0 16px;
  }
  
  .brand-name {
    display: none; /* 窄屏隐藏文字，保留图标 */
  }
  
  .nav {
    margin-left: 20px;
    gap: 16px;
  }
  
  .nav a {
    font-size: 13px;
  }
  
  .top-actions {
    gap: 8px;
  }
  
  .login-link {
    padding: 6px 12px;
    font-size: 13px;
  }
  
  .register-link {
    padding: 6px 16px;
    font-size: 13px;
  }
  
  .pricing-shell {
    padding-top: 88px;
  }
  
  .hero-title {
    font-size: 32px;
  }
  
  .summary-grid {
    grid-template-columns: 1fr;
  }
  
  .recommend-grid {
    grid-template-columns: 1fr;
  }
  
  .tool-panel {
    border-radius: var(--r-md);
    grid-template-columns: 1fr;
    padding: 16px;
  }
  
  .filter-group {
    flex-direction: column;
    width: 100%;
  }
  
  .select-wrap, .tool-panel select {
    width: 100%;
  }
  
  .models-panel-head {
    padding: 20px;
  }
  
  .model-row {
    padding: 20px;
  }
  
  .model-price-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  
  .glossary-grid {
    grid-template-columns: 1fr;
  }
}