/*
  梦幻估价官网样式 v4
  方向：White Glass — 白色毛玻璃 + 液体玻璃按钮
  字体：Outfit（标题/英文） + JetBrains Mono（数据/代码） + 系统中文字体
  基底：白色/浅灰，蓝色强调，毛玻璃模块，液体玻璃按钮
*/

:root {
  /* Base — 浅色基调 */
  --bg-base: #f0f2f5;
  --bg-surface: #e8ecf1;
  --bg-elevated: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.55);
  --bg-glass-thick: rgba(255, 255, 255, 0.72);
  --border-default: rgba(0, 0, 0, 0.08);
  --border-subtle: rgba(0, 0, 0, 0.05);
  --border-accent: rgba(59, 130, 246, 0.2);

  /* Text */
  --text-primary: #1a1d23;
  --text-secondary: #5f6873;
  --text-muted: #9ca3af;

  /* Accents */
  --accent: #3b82f6;
  --accent-soft: #2563eb;
  --accent-glow: rgba(59, 130, 246, 0.25);
  --success: #22c55e;
  --success-soft: rgba(34, 197, 94, 0.12);
  --warning: #eab308;
  --warning-soft: rgba(234, 179, 8, 0.12);
  --violet: #8b5cf6;
  --violet-soft: rgba(139, 92, 246, 0.12);
  --cyan: #06b6d4;
  --cyan-soft: rgba(6, 182, 212, 0.12);
  --rose: #ec4899;
  --rose-soft: rgba(236, 72, 153, 0.12);

  /* Radius */
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-xl: 28px;

  /* Shadow — 柔和投影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06), 0 1px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 24px rgba(59, 130, 246, 0.15);

  /* Glass blur */
  --blur: 16px;
  --blur-lg: 24px;

  /* Font */
  --font-display: "Outfit", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", "Fira Code", monospace;

  /* Layout */
  --max-width: 1200px;
  --header-h: 70px;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  background: linear-gradient(160deg, #eef2f7 0%, #e4eaf3 40%, #dce4ef 100%);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
}

/* 背景装饰光斑 */
body::before,
body::after {
  content: "";
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

body::before {
  top: -15%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.12), transparent 70%);
}

body::after {
  bottom: -10%;
  left: -8%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.1), transparent 70%);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

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

/* ==================== 液体玻璃按钮 ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 11px 22px;
  border-radius: 12px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  cursor: pointer;
  white-space: nowrap;
  border: none;
  position: relative;
  overflow: hidden;
  transition: transform 0.2s cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 0.2s ease;
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255,255,255,0.5) 0%, rgba(255,255,255,0.1) 50%, rgba(255,255,255,0.3) 100%);
  opacity: 0;
  transition: opacity 0.2s ease;
  pointer-events: none;
}

.btn:hover::before {
  opacity: 1;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0) scale(0.98);
}

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* 液体玻璃 主按钮 */
.btn-primary {
  background: linear-gradient(135deg, #3b82f6 0%, #6366f1 50%, #8b5cf6 100%);
  color: #ffffff;
  box-shadow:
    0 4px 15px rgba(59, 130, 246, 0.35),
    0 1px 3px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(8px);
}

.btn-primary::before {
  background: linear-gradient(135deg, rgba(255,255,255,0.35) 0%, rgba(255,255,255,0.05) 50%, rgba(255,255,255,0.2) 100%);
}

.btn-primary:hover {
  box-shadow:
    0 8px 28px rgba(59, 130, 246, 0.4),
    0 2px 6px rgba(0, 0, 0, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

/* 液体玻璃 幽灵按钮 */
.btn-ghost {
  background: rgba(255, 255, 255, 0.45);
  color: var(--text-primary);
  border: 1px solid rgba(0, 0, 0, 0.08);
  backdrop-filter: blur(12px);
  box-shadow:
    0 2px 8px rgba(0, 0, 0, 0.04),
    inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.btn-ghost::before {
  background: linear-gradient(135deg, rgba(255,255,255,0.6) 0%, rgba(255,255,255,0.1) 50%, rgba(255,255,255,0.4) 100%);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.65);
  border-color: rgba(59, 130, 246, 0.2);
  color: var(--accent);
  box-shadow:
    0 4px 12px rgba(0, 0, 0, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.btn-lg {
  padding: 15px 30px;
  font-size: 0.98rem;
  border-radius: 14px;
}

/* ==================== Header — 毛玻璃 ==================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(var(--blur-lg));
  -webkit-backdrop-filter: blur(var(--blur-lg));
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition: background-color 0.25s ease, box-shadow 0.25s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
}

.brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  color: #ffffff;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

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

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.main-nav a {
  position: relative;
  padding: 6px 0;
  font-family: var(--font-display);
  font-weight: 500;
  transition: color 0.2s ease;
}

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

.main-nav a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.22s cubic-bezier(0.22, 1, 0.36, 1);
}

.main-nav a:hover::after {
  width: 100%;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  width: 40px;
  height: 40px;
  padding: 0;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-sm);
  cursor: pointer;
  backdrop-filter: blur(8px);
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(4px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-4px) rotate(-45deg);
}

/* ==================== Hero ==================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 80px) 0 110px;
  overflow: hidden;
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 70px;
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.15);
  padding: 8px 14px;
  border-radius: 999px;
  margin-bottom: 28px;
  text-transform: uppercase;
  backdrop-filter: blur(8px);
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.6rem, 5.5vw, 4.4rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0 0 26px;
}

.hero h1 .accent {
  background: linear-gradient(90deg, #3b82f6, #8b5cf6);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 0 36px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 44px;
}

.hero-specs {
  display: flex;
  gap: 34px;
}

.spec {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.spec-value {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.spec-label {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==================== Hero visual / valuation card — 毛玻璃 ==================== */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 480px;
}

.valuation-card {
  position: relative;
  width: 100%;
  max-width: 440px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-xl);
  overflow: hidden;
  backdrop-filter: blur(var(--blur-lg));
  -webkit-backdrop-filter: blur(var(--blur-lg));
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.1),
    0 4px 16px rgba(0, 0, 0, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.8),
    0 0 0 1px rgba(59, 130, 246, 0.08);
}

.valuation-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #3b82f6, #8b5cf6, #ec4899);
  z-index: 2;
}

.valuation-card::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 0;
  right: 0;
  height: 50%;
  background: linear-gradient(180deg, rgba(255,255,255,0.5) 0%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

.card-top {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  z-index: 1;
}

.server-tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--success);
  background: rgba(34, 197, 94, 0.12);
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.status-badge::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success);
}

.card-price {
  position: relative;
  padding: 26px 26px 20px;
  z-index: 1;
}

.price-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.18);
  padding: 5px 12px;
  border-radius: 6px;
  margin-bottom: 14px;
}

.price-yuan {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.1;
  margin-bottom: 8px;
}

.price-gold {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--warning);
}

.card-metrics {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 0 26px;
  margin-bottom: 28px;
  z-index: 1;
}

.metric {
  display: grid;
  grid-template-columns: 80px 1fr 28px;
  align-items: center;
  gap: 14px;
}

.metric-name {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.metric-bar {
  height: 8px;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.06);
  overflow: hidden;
}

.metric-bar span {
  display: block;
  height: 100%;
  width: var(--w);
  border-radius: 3px;
  background: linear-gradient(90deg, #3b82f6, #6366f1);
}

.metric-bar .accent-bar {
  background: linear-gradient(90deg, #8b5cf6, #3b82f6);
}

.metric-score {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: right;
}

.card-foot {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  padding: 20px 26px 26px;
  border-top: 1px solid rgba(0, 0, 0, 0.05);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  z-index: 1;
}

/* ==================== Valuation Methods — 三种估价方式 ==================== */
.valuation-methods {
  padding: 80px 0 60px;
}

.valuation-methods .section-header {
  text-align: center;
  margin-bottom: 48px;
}

.vm-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

.vm-card {
  padding: 28px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.2s ease;
}

.vm-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.vm-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.vm-num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.vm-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 4px;
  background: rgba(59, 130, 246, 0.08);
  color: var(--accent);
  border: 1px solid rgba(59, 130, 246, 0.12);
}

.vm-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--text-primary);
}

.vm-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0 0 16px;
}

.vm-list {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.vm-list li {
  font-size: 0.82rem;
  color: var(--text-secondary);
  padding-left: 16px;
  position: relative;
}

.vm-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-muted);
  opacity: 0.4;
}

.vm-visual {
  margin-top: auto;
  padding: 16px;
  background: rgba(0, 0, 0, 0.015);
  border-radius: 8px;
  border: 1px solid rgba(0, 0, 0, 0.03);
}

/* 估价引擎 */
.vm-engines {
  padding: 24px 28px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(0, 0, 0, 0.05);
  border-radius: var(--radius-md);
}

.vm-engines-title {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  margin: 0 0 16px;
  color: var(--text-muted);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.vm-engines-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.vm-engine {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.02);
}

.vm-engine-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.04);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  flex-shrink: 0;
}

.vm-engine-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.vm-engine-info strong {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.vm-engine-info span {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ==================== Customization — 定制化 ==================== */
.customization {
  padding: 80px 0 60px;
}

.customization .section-header {
  text-align: center;
  margin-bottom: 48px;
}

.custom-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}

.custom-card {
  padding: 28px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--radius-lg);
  transition: box-shadow 0.2s ease;
}

.custom-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.custom-card-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.custom-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.04);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  flex-shrink: 0;
}

.custom-card h4 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  margin: 0;
  color: var(--text-primary);
}

.custom-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0 0 16px;
}

.custom-code {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: rgba(0, 0, 0, 0.025);
  border-radius: 6px;
  font-size: 0.8rem;
}

.custom-code code {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-primary);
}

.custom-code span {
  color: var(--text-muted);
}

.custom-note {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  background: rgba(59, 130, 246, 0.04);
  border: 1px solid rgba(59, 130, 246, 0.1);
  border-radius: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.custom-note svg {
  color: var(--accent);
  flex-shrink: 0;
  opacity: 0.6;
}

/* ==================== Stats bar — 毛玻璃 ==================== */
.stats-bar {
  padding: 48px 0;
  background: rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border-top: 1px solid rgba(255, 255, 255, 0.5);
  border-bottom: 1px solid rgba(255, 255, 255, 0.5);
}

.stats-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.stat-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  padding: 22px;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.5);
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.stat-num {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ==================== Section common ==================== */
.section-header {
  max-width: 640px;
  margin: 0 auto 60px;
  text-align: center;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.15);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 20px;
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
  color: var(--text-primary);
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin: 0;
}

/* ==================== Valuation Methods — 毛玻璃 ==================== */
.valuation-methods {
  padding: 110px 0;
}

.methods-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.method-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-lg);
  padding: 32px;
  overflow: hidden;
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.5);
  transition: transform 0.28s cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 0.28s ease;
}

.method-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 35%;
  background: linear-gradient(180deg, rgba(255,255,255,0.3) 0%, transparent 100%);
  pointer-events: none;
}

.method-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.method-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 20px;
  position: relative;
  z-index: 1;
}

.method-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
}

.method-icon.model {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.15), rgba(99, 102, 241, 0.1));
  color: var(--accent);
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.method-icon.knn {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(168, 85, 247, 0.1));
  color: var(--violet);
  border: 1px solid rgba(139, 92, 246, 0.2);
}

.method-icon.rule {
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.15), rgba(22, 163, 74, 0.1));
  color: var(--success);
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.method-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 5px 10px;
  border-radius: 6px;
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent);
  border: 1px solid rgba(59, 130, 246, 0.15);
}

.method-badge.secondary {
  background: rgba(139, 92, 246, 0.1);
  color: var(--violet);
  border-color: rgba(139, 92, 246, 0.15);
}

.method-badge.rule {
  background: rgba(34, 197, 94, 0.1);
  color: var(--success);
  border-color: rgba(34, 197, 94, 0.15);
}

.method-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--text-primary);
  position: relative;
  z-index: 1;
}

.method-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin: 0 0 20px;
  position: relative;
  z-index: 1;
}

.method-features {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
  z-index: 1;
}

.method-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.method-features li::before {
  content: "";
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  margin-top: 7px;
}

.method-card:nth-child(2) .method-features li::before {
  background: var(--violet);
}

.method-card:nth-child(3) .method-features li::before {
  background: var(--success);
}

.method-scene {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 20px;
  border-top: 1px solid rgba(0, 0, 0, 0.05);
  margin-top: auto;
  position: relative;
  z-index: 1;
}

.scene-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.scene-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ==================== Features — 毛玻璃 ==================== */
.features {
  padding: 110px 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-lg);
  padding: 28px;
  overflow: hidden;
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.5);
  transition: transform 0.28s cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 0.28s ease;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 40%;
  background: linear-gradient(180deg, rgba(255,255,255,0.35) 0%, transparent 100%);
  pointer-events: none;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.feature-icon {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 5px 11px;
  border-radius: 999px;
  margin-bottom: 22px;
  position: relative;
  z-index: 1;
}

.feature-icon.ai {
  color: var(--accent);
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.18);
}

.feature-icon.knn {
  color: var(--violet);
  background: var(--violet-soft);
  border: 1px solid rgba(139, 92, 246, 0.2);
}

.feature-icon.rule {
  color: var(--success);
  background: var(--success-soft);
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.feature-icon.ui {
  color: var(--cyan);
  background: var(--cyan-soft);
  border: 1px solid rgba(6, 182, 212, 0.2);
}

.feature-icon.portable {
  color: var(--warning);
  background: var(--warning-soft);
  border: 1px solid rgba(234, 179, 8, 0.2);
}

.feature-icon.dual {
  color: var(--rose);
  background: var(--rose-soft);
  border: 1px solid rgba(236, 72, 153, 0.2);
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--text-primary);
  position: relative;
  z-index: 1;
}

.feature-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.65;
  position: relative;
  z-index: 1;
}

/* ==================== Workflow — 毛玻璃 ==================== */
.workflow {
  padding: 110px 0;
  background: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}

.steps::before {
  content: "";
  position: absolute;
  top: 32px;
  left: 12.5%;
  right: 12.5%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.08), transparent);
  z-index: 0;
}

.step {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.step-num {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  background: linear-gradient(135deg, #3b82f6, #6366f1);
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25), 0 0 0 8px rgba(255, 255, 255, 0.35);
  transition: box-shadow 0.22s ease, transform 0.22s ease;
}

.step:hover .step-num {
  box-shadow: 0 6px 18px rgba(59, 130, 246, 0.35), 0 0 0 8px rgba(59, 130, 246, 0.08);
  transform: scale(1.05);
}

.step h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--text-primary);
}

.step p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.6;
}

/* ==================== Download — 毛玻璃 ==================== */
.download {
  padding: 110px 0;
}

.download-card {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 50px;
  align-items: center;
  padding: 56px;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(var(--blur-lg));
  -webkit-backdrop-filter: blur(var(--blur-lg));
  box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.download-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 50%;
  background: linear-gradient(180deg, rgba(255,255,255,0.35) 0%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

.download-content {
  position: relative;
  z-index: 1;
}

.download-content h2 {
  font-family: var(--font-display);
  font-size: 2.1rem;
  font-weight: 700;
  margin: 16px 0 16px;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.download-content > p {
  color: var(--text-secondary);
  margin: 0 0 24px;
  max-width: 520px;
}

.file-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.file-meta span:not(:last-child)::after {
  content: "";
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-muted);
  margin-left: 12px;
  vertical-align: middle;
}

.download-note {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin: 18px 0 0;
  max-width: 480px;
}

.download-aside {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 260px;
  z-index: 1;
}

.download-box {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  width: 180px;
  height: 180px;
  border-radius: 26px;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.6);
  color: var(--accent);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.download-box::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: 27px;
  padding: 1px;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), transparent 50%, rgba(139, 92, 246, 0.15));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.download-box svg {
  width: 48px;
  height: 48px;
}

.download-box span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
  text-align: center;
  padding: 0 16px;
}

/* ==================== FAQ — 毛玻璃 ==================== */
.faq {
  padding: 110px 0;
  background: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: rgba(255, 255, 255, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-md);
  overflow: hidden;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  transition: box-shadow 0.22s ease, background-color 0.22s ease;
}

.faq-item[open] {
  background: rgba(255, 255, 255, 0.6);
  box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.faq-item summary {
  padding: 22px 26px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: color 0.2s ease;
}

.faq-item summary:hover {
  color: var(--accent);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "";
  width: 10px;
  height: 10px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1);
  color: var(--text-muted);
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item[open] summary::after {
  transform: rotate(-135deg);
  color: var(--accent);
}

.faq-answer {
  padding: 0 26px 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
}

.faq-answer p {
  margin: 0;
}

/* ==================== Footer ==================== */
.site-footer {
  padding: 56px 0;
  background: rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border-top: 1px solid rgba(255, 255, 255, 0.5);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 14px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.footer-brand .brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  font-size: 0.75rem;
}

.footer-copy {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==================== Scroll reveal ==================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

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

/* ==================== Pricing ==================== */
.pricing { padding: 80px 0; }
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 32px;
}
@media (max-width: 920px) { .pricing-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .pricing-grid { grid-template-columns: 1fr; } }
.pricing-card {
  background: var(--bg-glass-thick);
  border: 1px solid var(--border-default);
  border-radius: 20px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  backdrop-filter: blur(20px);
  position: relative;
  transition: transform .2s ease, box-shadow .2s ease;
}
.pricing-card:hover { transform: translateY(-4px); box-shadow: 0 18px 40px var(--accent-glow); }
.pricing-card.popular { border: 2px solid var(--accent); box-shadow: 0 0 0 6px var(--accent-glow); }
.popular-badge {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: var(--accent); color: #fff; font-size: 12px; font-weight: 700;
  padding: 4px 14px; border-radius: 999px; letter-spacing: .5px;
}
.pricing-card h3 { margin: 0 0 18px; font-size: 18px; color: var(--text-primary); }
.price-num { display: flex; align-items: baseline; gap: 2px; color: var(--accent); margin-bottom: 20px; font-size: 56px; font-weight: 800; line-height: 1; }
.price-num .currency { font-size: 20px; font-weight: 600; }
.price-features { list-style: none; padding: 0; margin: 0 0 24px; width: 100%; }
.price-features li { padding: 6px 0; font-size: 14px; color: var(--text-secondary); border-bottom: 1px dashed var(--border-subtle); }
.price-features li:last-child { border-bottom: 0; }
.pricing-note {
  margin-top: 18px;
  display: flex; align-items: center; justify-content: center; gap: 6px;
  color: var(--text-muted); font-size: 13px;
}

/* ==================== Responsive ==================== */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 60px;
  }

  .hero-copy {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .hero-lead {
    max-width: 620px;
  }

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

  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .methods-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .vm-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .vm-card:last-child {
    grid-column: span 2;
  }

  .vm-engines-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .custom-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-inner {
    grid-template-columns: repeat(2, 1fr);
  }

  .download-card {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .download-content {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .file-meta {
    justify-content: center;
  }

  .download-note {
    max-width: 100%;
  }
}

@media (max-width: 768px) {
  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 16px 24px 24px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(var(--blur-lg));
    -webkit-backdrop-filter: blur(var(--blur-lg));
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    transform: translateY(-130%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.22s ease;
  }

  .main-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .main-nav a {
    padding: 16px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  }

  .main-nav a:last-child {
    border-bottom: none;
  }

  .header-actions {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .hero {
    padding-top: calc(var(--header-h) + 60px);
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    max-width: 320px;
  }

  .hero-specs {
    flex-direction: column;
    align-items: center;
    gap: 20px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .methods-grid {
    grid-template-columns: 1fr;
  }

  .vm-grid {
    grid-template-columns: 1fr;
  }

  .vm-card:last-child {
    grid-column: span 1;
  }

  .vm-engines-grid {
    grid-template-columns: 1fr;
  }

  .custom-grid {
    grid-template-columns: 1fr;
  }

  .sv-methods {
    grid-template-columns: 1fr;
  }

  .vm-badge {
    font-size: 0.62rem;
    padding: 2px 8px;
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .stats-inner {
    grid-template-columns: 1fr;
  }

  .download-card {
    padding: 36px 24px;
  }

  .download-content h2 {
    font-size: 1.7rem;
  }
}

/* === Pricing === */
.pricing { padding: 80px 0; }
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 32px;
}
@media (max-width: 920px) {
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .pricing-grid { grid-template-columns: 1fr; }
}
.pricing-card {
  background: var(--bg-glass-thick);
  border: 1px solid var(--border-default);
  border-radius: 20px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  backdrop-filter: blur(20px);
  position: relative;
  transition: transform .2s ease, box-shadow .2s ease;
}
.pricing-card:hover { transform: translateY(-4px); box-shadow: 0 18px 40px var(--accent-glow); }
.pricing-card.popular {
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 6px var(--accent-glow);
}
.popular-badge {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: var(--accent); color: #fff; font-size: 12px; font-weight: 700;
  padding: 4px 14px; border-radius: 999px; letter-spacing: .5px;
}
.pricing-card h3 { margin: 0 0 18px; font-size: 18px; color: var(--text-primary); }
.price-num { display: flex; align-items: baseline; gap: 2px; color: var(--accent); margin-bottom: 20px; }
.price-num .currency { font-size: 20px; font-weight: 600; }
.price-num { font-size: 56px; font-weight: 800; line-height: 1; }
.price-features {
  list-style: none; padding: 0; margin: 0 0 24px; width: 100%;
}
.price-features li {
  padding: 6px 0; font-size: 14px; color: var(--text-secondary);
  border-bottom: 1px dashed var(--border-subtle);
}
.price-features li:last-child { border-bottom: 0; }
.pricing-note {
  margin-top: 18px;
  display: flex; align-items: center; justify-content: center; gap: 6px;
  color: var(--text-muted); font-size: 13px;
}