@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ========================================
   星辰记官网 - 设计系统 v2
   方向：现代 AI 应用科技感
   ======================================== */

:root {
  /* 主色调 */
  --primary: #a855f7;
  --primary-glow: #c084fc;
  --primary-dark: #7c3aed;
  --accent: #6366f1;
  --accent-cyan: #22d3ee;
  --accent-rose: #f472b6;

  /* 背景层次 */
  --bg-deep: #09090b;
  --bg-base: #0c0c14;
  --bg-elevated: #12121e;
  --bg-surface: #1a1a2e;
  --bg-card: rgba(22, 22, 42, 0.6);

  /* 文字 */
  --text-primary: #fafafa;
  --text-secondary: #a1a1aa;
  --text-tertiary: #71717a;

  /* 边框 */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-default: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.15);
  --border-glow: rgba(168, 85, 247, 0.3);
  --border-glow-strong: rgba(168, 85, 247, 0.5);

  /* 圆角 */
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-2xl: 32px;

  /* 阴影 */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 60px rgba(168, 85, 247, 0.15);
  --shadow-glow-strong: 0 0 80px rgba(168, 85, 247, 0.25);

  /* 过渡 */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);

  /* 字体 */
  --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

  /* 向后兼容旧 CSS 变量名（博客页面使用） */
  --foreground: var(--text-primary);
  --foreground-muted: var(--text-secondary);
  --primary-light: var(--primary-glow);
  --background: var(--bg-base);
  --background-elevated: var(--bg-elevated);
  --border: var(--border-default);
  --border-light: var(--border-glow);
  --card: var(--bg-card);
  --card-solid: var(--bg-surface);
  --shadow: var(--shadow-card);
}

/* ========================================
   Reset & Base
   ======================================== */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

::selection {
  background: rgba(168, 85, 247, 0.35);
  color: var(--text-primary);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-deep);
}

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-glow);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

.container-narrow {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ========================================
   Utilities
   ======================================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* 双色渐变文字 */
.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-cyan) 40%, var(--primary-glow) 70%, var(--accent-rose) 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 8s ease-in-out infinite;
}

@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

/* 紫-青双色 */
.gradient-text-purple {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 发光边框 */
.glow-border {
  border: 1px solid var(--border-default);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.glow-border:hover {
  border-color: var(--border-glow);
  box-shadow: 0 0 30px rgba(168, 85, 247, 0.12), inset 0 0 30px rgba(168, 85, 247, 0.04);
}

/* ========================================
   Navigation
   ======================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 68px;
  display: flex;
  align-items: center;
  background: rgba(9, 9, 11, 0.75);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition), box-shadow var(--transition);
}

.nav.scrolled {
  background: rgba(9, 9, 11, 0.92);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
  border-bottom-color: var(--border-default);
}

.nav-inner {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  z-index: 2;
}

.nav-logo-icon {
  width: 34px;
  height: 34px;
  border-radius: 9px;
}

.nav-logo-text {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--primary);
  border-radius: 1px;
  transition: width var(--transition-fast);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-badge {
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary-glow);
  border: 1px solid var(--border-glow);
  border-radius: 100px;
  background: rgba(168, 85, 247, 0.08);
  white-space: nowrap;
}

.nav-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  transition: background var(--transition-fast);
  z-index: 2;
}

.nav-menu-btn:hover {
  background: rgba(255, 255, 255, 0.06);
}

.nav-menu-btn span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
  transform-origin: center;
}

.nav-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-menu-btn.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  background: rgba(9, 9, 11, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 12px 16px 20px;
  border-bottom: 1px solid var(--border-default);
  z-index: 999;
  transform: translateY(-110%);
  opacity: 0;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease;
  pointer-events: none;
}

.mobile-nav.active {
  display: block;
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-inner {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.mobile-nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  padding: 12px 16px;
  border-radius: 10px;
  transition: all var(--transition-fast);
}

.mobile-nav-link:hover {
  color: var(--text-primary);
  background: rgba(168, 85, 247, 0.08);
}

.mobile-nav-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
}

.mobile-nav-badge {
  display: inline-flex;
  align-self: flex-start;
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary-glow);
  border: 1px solid var(--border-glow);
  border-radius: 100px;
  background: rgba(168, 85, 247, 0.08);
}

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

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: 68px;
  overflow: hidden;
}

/* 网格线背景 */
.hero-bg-grid {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 64px 64px;
  /* 边缘渐隐 */
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 70%);
}

/* 渐变底色 */
.hero-bg-gradient {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(99, 102, 241, 0.12) 0%, transparent 70%),
    radial-gradient(ellipse 50% 50% at 80% 60%, rgba(168, 85, 247, 0.1) 0%, transparent 60%),
    radial-gradient(ellipse 40% 40% at 20% 70%, rgba(34, 211, 238, 0.06) 0%, transparent 60%);
}

/* 浮动星光 */
.hero-stars {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.star {
  position: absolute;
  width: 2px;
  height: 2px;
  background: white;
  border-radius: 50%;
  animation: star-twinkle var(--duration) ease-in-out infinite;
  animation-delay: var(--delay);
  opacity: 0;
}

@keyframes star-twinkle {
  0%, 100% { opacity: 0.2; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(1.8); }
}

/* 浮动光斑 */
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.25;
  z-index: 0;
  pointer-events: none;
  animation: hero-float 20s ease-in-out infinite;
}

.hero-glow-1 {
  top: -10%;
  left: -5%;
  width: 500px;
  height: 500px;
  background: var(--primary);
}

.hero-glow-2 {
  bottom: -20%;
  right: -5%;
  width: 600px;
  height: 600px;
  background: var(--accent);
  animation-delay: -10s;
}

.hero-glow-3 {
  top: 40%;
  left: 50%;
  width: 300px;
  height: 300px;
  background: var(--accent-cyan);
  animation-delay: -5s;
  opacity: 0.12;
}

@keyframes hero-float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -40px) scale(1.08); }
  66% { transform: translate(-20px, 30px) scale(0.93); }
}

/* Hero 内容 */
.hero .container {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  padding-top: 40px;
  padding-bottom: 40px;
}

.hero-content {
  display: flex;
  flex-direction: column;
  max-width: 560px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  margin-bottom: 28px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary-glow);
  background: rgba(168, 85, 247, 0.08);
  border: 1px solid var(--border-glow);
  border-radius: 100px;
  width: fit-content;
}

.hero-tag-dot {
  width: 6px;
  height: 6px;
  background: var(--accent-cyan);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 4px var(--accent-cyan); }
  50% { opacity: 0.3; box-shadow: 0 0 10px var(--accent-cyan); }
}

.hero-title {
  font-size: clamp(32px, 4.5vw, 52px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 28px;
}

.hero-statement {
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 28px;
}

.hero-pain-points {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}

.pain-point {
  font-size: clamp(14px, 1.3vw, 16px);
  color: var(--text-secondary);
  line-height: 1.6;
  padding-left: 16px;
  position: relative;
}

.pain-point::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--primary);
  opacity: 0.5;
}

.hero-personas {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: 36px;
}

.persona-dot {
  color: var(--primary);
  opacity: 0.4;
}

.hero-cta {
  display: flex;
  gap: 14px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-platforms {
  display: flex;
  align-items: center;
  gap: 16px;
}

.hero-platforms-label {
  font-size: 13px;
  color: var(--text-tertiary);
  white-space: nowrap;
}

.hero-platforms-icons {
  display: flex;
  gap: 10px;
}

.platform-icon {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  color: var(--text-tertiary);
  transition: var(--transition);
  cursor: default;
}

.platform-icon:hover {
  background: rgba(168, 85, 247, 0.1);
  border-color: var(--border-glow);
  color: var(--primary-glow);
}

.platform-icon svg {
  width: 18px;
  height: 18px;
}

/* Hero AI 教练洞察卡片 */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-insight-card {
  position: relative;
  width: 420px;
  background: linear-gradient(145deg, rgba(30, 25, 50, 0.95), rgba(18, 15, 32, 0.98));
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 0;
  overflow: hidden;
  box-shadow:
    0 40px 80px rgba(0, 0, 0, 0.6),
    0 0 0 1px rgba(168, 85, 247, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
  animation: card-float 6s ease-in-out infinite;
}

@keyframes card-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.hero-insight-glow {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 20%, rgba(168, 85, 247, 0.08) 0%, transparent 50%);
  pointer-events: none;
}

.hero-insight-header {
  padding: 18px 24px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary-glow);
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(168, 85, 247, 0.04);
  letter-spacing: 0.5px;
}

.hero-insight-body {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hero-insight-user,
.hero-insight-ai {
  position: relative;
}

.hero-insight-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.ai-label {
  color: var(--primary-glow);
}

.hero-insight-user p {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-secondary);
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
  font-style: italic;
}

.hero-insight-finding,
.hero-insight-suggestion {
  display: flex;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 13px;
  line-height: 1.6;
}

.hero-insight-finding {
  background: rgba(168, 85, 247, 0.06);
  border: 1px solid rgba(168, 85, 247, 0.12);
  margin-bottom: 8px;
}

.hero-insight-finding p {
  color: var(--text-secondary);
}

.hero-insight-finding p span {
  color: var(--primary-glow);
  font-weight: 600;
}

.hero-insight-suggestion {
  background: rgba(34, 211, 238, 0.05);
  border: 1px solid rgba(34, 211, 238, 0.12);
}

.hero-insight-suggestion p {
  color: var(--text-secondary);
}

/* ========================================
   Buttons
   ======================================== */

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: linear-gradient(135deg, var(--primary), var(--accent), var(--primary-dark));
  background-size: 200% 200%;
  color: white;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: 0 4px 24px rgba(168, 85, 247, 0.25);
  animation: btn-gradient 4s ease-in-out infinite;
  position: relative;
  overflow: hidden;
}

@keyframes btn-gradient {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(168, 85, 247, 0.35);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: transparent;
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  border-radius: 12px;
  border: 1px solid var(--border-default);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--border-glow);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-default);
}

/* 水波纹 */
.btn-primary, .btn-secondary, .btn-ghost {
  position: relative;
  overflow: hidden;
}

.ripple {
  position: absolute;
  width: 80px;
  height: 80px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(0);
  animation: ripple-effect 0.6s ease-out;
  pointer-events: none;
}

@keyframes ripple-effect {
  to {
    transform: translate(-50%, -50%) scale(4);
    opacity: 0;
  }
}

/* ========================================
   Stats Section
   ======================================== */

.stats {
  padding: 100px 0;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
  overflow: hidden;
}

.stats::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 50% at 50% 50%, rgba(168, 85, 247, 0.04) 0%, transparent 70%);
  pointer-events: none;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
  position: relative;
  z-index: 1;
}

.stat-item {
  padding: 32px 16px;
}

.stat-number {
  font-family: var(--font-mono);
  font-size: clamp(36px, 4vw, 52px);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
  background: linear-gradient(180deg, var(--text-primary) 0%, var(--primary-glow) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 14px;
  color: var(--text-tertiary);
  font-weight: 500;
}

/* ========================================
   Section Headers
   ======================================== */

.section-header {
  text-align: center;
  margin-bottom: 72px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  margin-bottom: 20px;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary-glow);
  background: rgba(168, 85, 247, 0.06);
  border: 1px solid var(--border-glow);
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.section-title {
  font-size: clamp(28px, 3.5vw, 44px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ========================================
   Features - Bento Grid
   ======================================== */

.features {
  padding: 120px 0;
  position: relative;
  overflow: hidden;
}

.features::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-glow), transparent);
}

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

.bento-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 28px;
  transition: all var(--transition);
  cursor: default;
  overflow: hidden;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.bento-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 0% 0%, rgba(168, 85, 247, 0.06) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.bento-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.bento-card:hover::before {
  opacity: 1;
}

/* Bento 尺寸 */
.bento-card-lg { grid-column: span 2; grid-row: span 2; }
.bento-card-md { grid-column: span 2; }
.bento-card-sm { grid-column: span 1; }

.bento-card-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.12), rgba(99, 102, 241, 0.06));
  border: 1px solid var(--border-glow);
  border-radius: 12px;
  color: var(--primary-glow);
  margin-bottom: 18px;
}

.bento-card-icon svg {
  width: 22px;
  height: 22px;
}

.bento-card-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.bento-card-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 大卡片内的 mockup */
.bento-card-visual {
  margin-top: 20px;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 20px;
  min-height: 120px;
}

.bento-card-visual .mockup-row {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.bento-card-visual .mockup-tag {
  padding: 4px 10px;
  font-size: 11px;
  color: var(--primary-glow);
  background: rgba(168, 85, 247, 0.1);
  border-radius: 6px;
  border: 1px solid rgba(168, 85, 247, 0.15);
}

.bento-card-visual .mockup-line {
  height: 8px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 4px;
  margin-bottom: 8px;
}

.bento-card-visual .mockup-line:last-child {
  width: 60%;
}

.bento-card-visual .mockup-progress {
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 8px;
}

.mockup-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent-cyan));
  border-radius: 3px;
  transition: width 1s ease;
}

/* ========================================
   Knowledge Graph Section
   ======================================== */

.knowledge-graph {
  padding: 120px 0;
  background: var(--bg-elevated);
  position: relative;
  overflow: hidden;
}

.knowledge-graph::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 40% at 70% 50%, rgba(34, 211, 238, 0.04) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 30% 50%, rgba(168, 85, 247, 0.04) 0%, transparent 70%);
  pointer-events: none;
}

.kg-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.kg-text {
  max-width: 480px;
}

.kg-title {
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  line-height: 1.15;
}

.kg-desc {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.kg-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.kg-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
}

.kg-features li svg {
  width: 16px;
  height: 16px;
  color: var(--accent-cyan);
  flex-shrink: 0;
}

/* 知识图谱可视化 */
.kg-visual {
  position: relative;
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.kg-graph {
  position: relative;
  width: 360px;
  height: 360px;
}

.kg-node {
  position: absolute;
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid var(--border-glow);
  background: rgba(168, 85, 247, 0.08);
  color: var(--primary-glow);
  white-space: nowrap;
  animation: node-pulse 3s ease-in-out infinite;
  animation-delay: var(--ndelay);
}

@keyframes node-pulse {
  0%, 100% { box-shadow: 0 0 0 rgba(168, 85, 247, 0); }
  50% { box-shadow: 0 0 20px rgba(168, 85, 247, 0.2); }
}

.kg-node.center {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  font-weight: 600;
  border: none;
  animation: center-glow 2.5s ease-in-out infinite;
}

@keyframes center-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(168, 85, 247, 0.3); }
  50% { box-shadow: 0 0 40px rgba(168, 85, 247, 0.5); }
}

.kg-node:nth-child(1) { top: 0; left: 50%; transform: translateX(-50%); }
.kg-node:nth-child(2) { top: 18%; right: 5%; }
.kg-node:nth-child(3) { top: 45%; right: 0; }
.kg-node:nth-child(4) { bottom: 18%; right: 5%; }
.kg-node:nth-child(5) { bottom: 0; left: 50%; transform: translateX(-50%); }
.kg-node:nth-child(6) { bottom: 18%; left: 5%; }
.kg-node:nth-child(7) { top: 45%; left: 0; }
.kg-node:nth-child(8) { top: 18%; left: 5%; }

/* 连线 - 伪元素实现 */
.kg-lines {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.kg-line {
  position: absolute;
  background: linear-gradient(90deg, var(--border-glow), transparent);
  height: 1px;
  opacity: 0.4;
  transform-origin: left center;
}

/* ========================================
   Pricing Section
   ======================================== */

.pricing {
  padding: 120px 0;
  position: relative;
}

/* 月付/年付切换 */
.pricing-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  margin-bottom: 48px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  padding: 4px;
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

.pricing-toggle-btn {
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  background: none;
  border: none;
  border-radius: 100px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pricing-toggle-btn.active {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  font-weight: 600;
  box-shadow: 0 2px 12px rgba(168, 85, 247, 0.3);
}

.pricing-toggle-btn:hover:not(.active) {
  color: var(--text-primary);
}

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

.pricing-card {
  position: relative;
  padding: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all var(--transition);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.pricing-card.featured {
  border-color: var(--border-glow);
  background: linear-gradient(165deg, rgba(168, 85, 247, 0.06), rgba(22, 22, 42, 0.7));
  box-shadow: 0 0 40px rgba(168, 85, 247, 0.08);
}

.pricing-badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  padding: 5px 18px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  font-size: 12px;
  font-weight: 600;
  border-radius: 100px;
  white-space: nowrap;
}

.pricing-header {
  text-align: center;
  padding-bottom: 28px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--border-subtle);
}

.pricing-name {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 16px;
}

.pricing-price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.price-amount {
  font-family: var(--font-mono);
  font-size: 44px;
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(180deg, var(--text-primary), var(--primary-glow));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.price-original {
  display: block;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 500;
  color: var(--text-tertiary);
  text-decoration: line-through;
  margin-bottom: -4px;
  letter-spacing: 0.02em;
}

.price-period {
  font-size: 14px;
  color: var(--text-tertiary);
}

.pricing-features {
  list-style: none;
  margin-bottom: 28px;
}

.pricing-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  font-size: 14px;
  color: var(--text-secondary);
}

.pricing-feature svg {
  width: 16px;
  height: 16px;
  color: var(--accent-cyan);
  flex-shrink: 0;
}

/* disabled 特性 */
.pricing-feature-disabled {
  opacity: 0.35;
}
.pricing-feature-disabled svg {
  color: var(--text-tertiary);
}

.pricing-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 14px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pricing-btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
}

.pricing-btn-primary:hover {
  box-shadow: 0 6px 24px rgba(168, 85, 247, 0.3);
}

.pricing-btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-default);
}

.pricing-btn-secondary:hover {
  border-color: var(--border-glow);
  background: rgba(168, 85, 247, 0.06);
}

.pricing-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 32px;
  padding: 14px 24px;
  background: rgba(168, 85, 247, 0.04);
  border: 1px solid var(--border-glow);
  border-radius: 12px;
  color: var(--text-secondary);
  font-size: 13px;
}

.pricing-note svg {
  width: 18px;
  height: 18px;
  color: var(--primary-glow);
}

/* ========================================
   Download Section
   ======================================== */

.download {
  padding: 120px 0;
  background: linear-gradient(180deg, var(--bg-base) 0%, var(--bg-elevated) 100%);
  position: relative;
  overflow: hidden;
}

.download::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 40% at 50% 30%, rgba(168, 85, 247, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.download-content {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.download-title {
  font-size: clamp(28px, 3.5vw, 42px);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.download-desc {
  font-size: 17px;
  color: var(--text-secondary);
  margin-bottom: 44px;
}

.download-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.download-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 28px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all var(--transition);
}

.download-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-glow);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.download-btn svg {
  width: 30px;
  height: 30px;
  color: var(--text-primary);
}

.download-btn-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
}

.download-btn-label {
  font-size: 11px;
  color: var(--text-tertiary);
}

.download-btn-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.download-qr {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
}

.download-qr-box {
  width: 110px;
  height: 110px;
  background: white;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.download-qr-box svg {
  width: 72px;
  height: 72px;
  color: #666;
}

.download-qr-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-align: left;
}

.download-qr-text span:first-child {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.download-qr-text span:last-child {
  font-size: 13px;
  color: var(--text-tertiary);
}

.download-version {
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
}

/* =========================================
   Footer
   ======================================== */

.footer {
  padding: 64px 0 32px;
  background: var(--bg-deep);
  border-top: 1px solid var(--border-subtle);
}

.footer-main {
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: 64px;
  margin-bottom: 48px;
}

.footer-brand {
  max-width: 280px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  margin-bottom: 14px;
}

.footer-logo img {
  width: 30px;
  height: 30px;
  border-radius: 8px;
}

.footer-logo span {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-tagline {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.footer-col-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

.footer-col {
  list-style: none;
}

.footer-link {
  display: block;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  padding: 6px 0;
  transition: color var(--transition-fast);
}

.footer-links-row {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.footer-links-row .footer-link {
  display: inline;
  padding: 0;
  font-size: 13px;
}

.footer-link:hover {
  color: var(--text-primary);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
}

.copyright {
  font-size: 13px;
  color: var(--text-tertiary);
}

.icp {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: 6px;
}

.icp a {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.icp a:hover {
  color: var(--primary-glow);
}

/* ========================================
   FAQ Section
   ======================================== */

.faq {
  padding: 100px 0;
  background: var(--bg-elevated);
}

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

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
}

.faq-item:hover {
  border-color: var(--border-glow);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.faq-question {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.faq-answer {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ========================================
   Animations - Scroll-triggered
   ======================================== */

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-in-visible {
  opacity: 1;
  transform: translateY(0);
}

/* 交错延迟 */
.fade-in-delay-1 { transition-delay: 0.05s; }
.fade-in-delay-2 { transition-delay: 0.1s; }
.fade-in-delay-3 { transition-delay: 0.15s; }
.fade-in-delay-4 { transition-delay: 0.2s; }
.fade-in-delay-5 { transition-delay: 0.25s; }

/* ========================================
   Blog Styles - Enhanced
   ======================================== */

.blog-page {
  padding-top: 68px;
  background: var(--bg-deep);
}

/* 顶部渐变装饰线 */
.blog-page::before {
  content: '';
  display: block;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--primary), var(--accent-cyan), var(--primary), transparent);
  opacity: 0.6;
}

.blog-main {
  padding: 56px 0 80px;
}

.blog-article {
  max-width: 740px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 返回链接 */
.blog-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-tertiary);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 28px;
  padding: 6px 14px 6px 10px;
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  transition: all var(--transition-fast);
}
.blog-back:hover {
  color: var(--text-primary);
  border-color: var(--border-glow);
  background: rgba(168, 85, 247, 0.06);
}
.blog-back svg { width: 14px; height: 14px; }

/* 文章标题 - 带渐变 */
.blog-article-title {
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-glow) 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 文章元信息 */
.blog-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}
.blog-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-tertiary);
}
.blog-meta-item svg {
  width: 14px;
  height: 14px;
  color: var(--primary-glow);
}
.blog-meta-divider {
  width: 3px;
  height: 3px;
  background: var(--text-tertiary);
  border-radius: 50%;
}

/* 文章正文 */
.blog-body h2 {
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin: 52px 0 18px;
  padding-left: 16px;
  border-left: 3px solid var(--primary);
  line-height: 1.3;
}
.blog-body h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 36px 0 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.blog-body h3::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 50%;
  flex-shrink: 0;
}
.blog-body h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 28px 0 10px;
}
.blog-body p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-secondary);
  margin-bottom: 20px;
}
.blog-body strong {
  color: var(--text-primary);
  font-weight: 600;
}
.blog-body ul, .blog-body ol {
  padding-left: 22px;
  margin-bottom: 20px;
}
.blog-body li {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-secondary);
  margin-bottom: 10px;
  padding-left: 2px;
}
.blog-body li::marker {
  color: var(--primary-glow);
}
.blog-body a {
  color: var(--primary-glow);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}
.blog-body a:hover {
  color: var(--accent-cyan);
}

/* 引用块 - 增强 */
.blog-body blockquote {
  position: relative;
  background: rgba(168, 85, 247, 0.04);
  border: 1px solid rgba(168, 85, 247, 0.15);
  border-left: 3px solid var(--primary);
  padding: 22px 24px 22px 52px;
  margin: 36px 0;
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}
.blog-body blockquote::before {
  content: '"';
  position: absolute;
  left: 18px;
  top: 12px;
  font-size: 36px;
  font-weight: 800;
  color: var(--primary);
  opacity: 0.4;
  font-family: var(--font-sans);
  line-height: 1;
}
.blog-body blockquote p {
  margin-bottom: 0;
  color: var(--text-primary);
  font-style: italic;
}

/* 行内代码 */
.blog-body code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: rgba(168, 85, 247, 0.1);
  padding: 2px 7px;
  border-radius: 4px;
  color: var(--primary-glow);
  border: 1px solid rgba(168, 85, 247, 0.15);
}

/* 代码块 */
.blog-body pre {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  padding: 20px 24px;
  overflow-x: auto;
  margin-bottom: 20px;
  line-height: 1.6;
}
.blog-body pre code {
  background: none;
  padding: 0;
  color: var(--text-secondary);
  border: none;
  font-size: 13px;
}

/* 图片 */
.blog-body img {
  max-width: 100%;
  border-radius: var(--radius);
  margin: 24px 0;
  border: 1px solid var(--border-subtle);
}

/* 表格 */
.blog-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
  font-size: 14px;
}
.blog-body th, .blog-body td {
  padding: 10px 14px;
  border: 1px solid var(--border-subtle);
  text-align: left;
}
.blog-body th {
  background: rgba(168, 85, 247, 0.06);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 13px;
}
.blog-body td {
  color: var(--text-secondary);
}

/* CTA 盒子 - 增强 */
.blog-cta {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.1), rgba(99, 102, 241, 0.05));
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-xl);
  padding: 40px 36px;
  margin: 48px 0;
  text-align: center;
}
.blog-cta::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -10%;
  width: 200px;
  height: 200px;
  background: var(--primary);
  filter: blur(80px);
  opacity: 0.1;
  pointer-events: none;
}
.blog-cta h3 {
  position: relative;
  margin-top: 0;
  margin-bottom: 8px;
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
}
.blog-cta p {
  position: relative;
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-size: 15px;
}
.blog-cta .btn-primary {
  position: relative;
}

/* 文章标签 */
.blog-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}
.blog-tag {
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--primary-glow);
  background: rgba(168, 85, 247, 0.08);
  border: 1px solid var(--border-glow);
  border-radius: 100px;
  transition: all var(--transition-fast);
  text-decoration: none;
}
.blog-tag:hover {
  background: rgba(168, 85, 247, 0.15);
}

/* 步骤编号 */
.blog-step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  font-size: 14px;
  font-weight: 700;
  border-radius: 50%;
  margin-right: 10px;
  flex-shrink: 0;
  box-shadow: 0 2px 12px rgba(168, 85, 247, 0.3);
}

/* MCP 指南 - 通知/提示框 */
.blog-notice {
  background: rgba(34, 211, 238, 0.06);
  border: 1px solid rgba(34, 211, 238, 0.2);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 20px;
  font-size: 14px;
  color: var(--text-secondary);
}
.blog-notice strong {
  color: var(--accent-cyan);
}

/* ========================================
   Blog List Page
   ======================================== */

/* ========================================
   Blog Index - Magazine Style
   ======================================== */

.blog-index {
  padding: 60px 24px 80px;
  max-width: 880px;
  margin: 0 auto;
}

.blog-hero {
  text-align: center;
  padding: 40px 0 56px;
}

.blog-hero-badge {
  display: inline-block;
  padding: 4px 16px;
  font-size: 12px;
  font-weight: 600;
  color: #a855f7;
  background: rgba(168,85,247,0.08);
  border-radius: 100px;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.blog-hero h1 {
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--text-primary), #a855f7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.blog-hero p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 420px;
  margin: 0 auto;
  line-height: 1.6;
}

.blog-posts {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.blog-post {
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  overflow: hidden;
  transition: all .25s ease;
}

.blog-post:hover {
  border-color: var(--border-glow);
  box-shadow: 0 4px 24px rgba(168,85,247,0.08);
  transform: translateY(-2px);
}

.blog-post-link {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 24px 28px;
  text-decoration: none;
  color: inherit;
}

.blog-post-visual {
  flex-shrink: 0;
  width: 100px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.blog-post-visual svg {
  width: 100%;
  height: 100%;
}

.blog-post-body {
  flex: 1;
  min-width: 0;
}

.blog-post-body h2 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 6px;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.blog-post-body p {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0 0 8px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-post-body time {
  font-size: 12px;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
}

.blog-post-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  color: #a855f7;
  background: rgba(168,85,247,0.08);
  padding: 2px 10px;
  border-radius: 6px;
  margin-bottom: 6px;
}

/* 博客列表响应式 */
@media (max-width: 768px) {
  .blog-index {
    padding: 40px 16px 60px;
  }
  .blog-hero {
    padding: 24px 0 40px;
  }
  .blog-hero h1 {
    font-size: 26px;
  }
  .blog-post-link {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding: 20px;
  }
  .blog-post-visual {
    width: 80px;
    height: 48px;
  }
  .blog-post-body h2 {
    font-size: 16px;
  }
}

/* 博客文章响应式 */
@media (max-width: 768px) {
  .blog-main {
    padding: 32px 0 60px;
  }
  .blog-article {
    padding: 0 20px;
  }
  .blog-body p, .blog-body li {
    font-size: 15px;
  }
  .blog-body h2 {
    font-size: 20px;
    margin-top: 40px;
  }
  .blog-body h3 {
    font-size: 17px;
  }
  .blog-cta {
    padding: 28px 20px;
  }
  .blog-meta {
    gap: 12px;
  }
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 1100px) {
  .kg-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

  .kg-text {
    max-width: 100%;
  }

  .kg-features {
    align-items: center;
  }

  .kg-visual {
    height: 340px;
  }
}

@media (max-width: 968px) {
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .bento-card-lg { grid-column: span 2; grid-row: auto; }
  .bento-card-md { grid-column: span 2; }
  .bento-card-sm { grid-column: span 1; }

  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 48px;
  }

  .hero-content {
    max-width: 100%;
    align-items: center;
  }

  .hero-statement {
    font-size: 18px;
  }

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

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

  .hero-visual {
    max-width: 340px;
    margin: 0 auto;
  }

  .hero-insight-card {
    width: 100%;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  .container, .container-narrow, .nav-inner {
    padding: 0 20px;
  }

  /* Nav */
  .nav {
    height: 60px;
  }

  .nav-links, .nav-actions {
    display: none;
  }

  .nav-menu-btn {
    display: flex;
  }

  .nav-logo-icon {
    width: 28px;
    height: 28px;
  }

  .nav-logo-text {
    font-size: 15px;
  }

  /* Hero */
  .hero {
    padding-top: 60px;
    min-height: auto;
    padding-bottom: 40px;
  }

  .hero .container {
    padding-top: 24px;
    padding-bottom: 24px;
  }

  .hero-title {
    font-size: 30px;
  }

  .hero-statement {
    font-size: 16px;
  }

  .pain-point {
    font-size: 13px;
  }

  .hero-personas {
    font-size: 12px;
    margin-bottom: 28px;
  }

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

  .hero-cta .btn-primary,
  .hero-cta .btn-secondary {
    width: 100%;
    justify-content: center;
  }

  .hero-platforms {
    flex-direction: column;
    gap: 10px;
  }

  .hero-insight-card {
    max-width: 300px;
  }

  /* Stats */
  .stats {
    padding: 60px 0;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .stat-item {
    padding: 20px 8px;
  }

  .stat-number {
    font-size: 32px;
  }

  /* Features */
  .features {
    padding: 80px 0;
  }

  .section-header {
    margin-bottom: 48px;
  }

  .section-title {
    font-size: 26px;
  }

  .section-desc {
    font-size: 15px;
  }

  .bento-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .bento-card-lg, .bento-card-md, .bento-card-sm {
    grid-column: span 1;
    grid-row: auto;
  }

  .bento-card {
    padding: 20px;
  }

  .bento-card-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
  }

  .bento-card-icon svg {
    width: 18px;
    height: 18px;
  }

  .bento-card-title {
    font-size: 16px;
  }

  .bento-card-desc {
    font-size: 13px;
  }

  .bento-card-visual {
    padding: 14px;
    min-height: 80px;
  }

  /* Knowledge Graph */
  .knowledge-graph {
    padding: 80px 0;
  }

  .kg-title {
    font-size: 26px;
  }

  .kg-desc {
    font-size: 15px;
  }

  .kg-visual {
    height: 280px;
  }

  .kg-graph {
    width: 280px;
    height: 280px;
  }

  .kg-node {
    padding: 6px 14px;
    font-size: 11px;
  }

  /* Pricing */
  .pricing {
    padding: 80px 0;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
    gap: 16px;
  }

  .pricing-card {
    padding: 28px 24px;
  }

  .pricing-name {
    font-size: 17px;
    margin-bottom: 12px;
  }

  .price-amount {
    font-size: 36px;
  }

  .pricing-feature {
    font-size: 13px;
    padding: 8px 0;
  }

  .pricing-feature svg {
    width: 14px;
    height: 14px;
  }

  /* Download */
  .download {
    padding: 80px 0;
  }

  .download-title {
    font-size: 26px;
  }

  .download-desc {
    font-size: 15px;
    margin-bottom: 32px;
  }

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

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

  .download-qr {
    flex-direction: column;
    text-align: center;
  }

  .download-qr-box {
    width: 100px;
    height: 100px;
  }

  .download-qr-box svg {
    width: 64px;
    height: 64px;
  }

  .download-qr-text {
    text-align: center;
  }

  /* FAQ */
  .faq {
    padding: 80px 0;
  }

  .faq-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .faq-item {
    padding: 20px;
  }

  .faq-question {
    font-size: 15px;
  }

  .faq-answer {
    font-size: 13px;
  }

  /* Footer */
  .footer {
    padding: 48px 0 24px;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 36px;
    text-align: center;
  }

  .footer-brand {
    max-width: 100%;
  }

  .footer-logo {
    justify-content: center;
  }

  .footer-links {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    text-align: center;
  }
}

@media (max-width: 420px) {
  .stats-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .kg-visual {
    height: 240px;
  }

  .kg-graph {
    width: 240px;
    height: 240px;
  }

  .kg-node {
    padding: 5px 10px;
    font-size: 10px;
  }
}

/* ========================================
   How AI Coach Works Section
   ======================================== */

.how-it-works {
  padding: 120px 0;
  position: relative;
  overflow: hidden;
}

.steps-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  max-width: 960px;
  margin: 0 auto;
}

.step-card {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 40px 28px;
  text-align: center;
  backdrop-filter: blur(12px);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  position: relative;
}

.step-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

.step-number {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 2px;
  margin-bottom: 16px;
  opacity: 0.7;
}

.step-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  color: var(--primary-glow);
}

.step-icon svg {
  width: 100%;
  height: 100%;
}

.step-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.step-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.step-connector {
  flex-shrink: 0;
  width: 32px;
  color: var(--primary);
  opacity: 0.4;
}

.step-connector svg {
  width: 100%;
  height: auto;
}

/* ========================================
   AI Coach Daily Cards Section
   ======================================== */

.coach-daily {
  padding: 120px 0;
  position: relative;
  overflow: hidden;
}

.coach-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 960px;
  margin: 0 auto;
}

.coach-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 40px 28px;
  text-align: center;
  backdrop-filter: blur(12px);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.coach-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

.coach-card-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 20px;
  color: var(--primary-glow);
}

.coach-card-icon svg {
  width: 100%;
  height: 100%;
}

.coach-card-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.coach-card-subtitle {
  font-size: 14px;
  color: var(--primary-glow);
  margin-bottom: 16px;
  font-weight: 500;
}

.coach-card-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  font-style: italic;
}

/* ========================================
   Responsive: How It Works & Coach Cards
   ======================================== */

@media (max-width: 968px) {
  .steps-grid {
    flex-direction: column;
    gap: 16px;
  }

  .step-connector {
    transform: rotate(90deg);
    width: 24px;
  }

  .coach-cards {
    grid-template-columns: 1fr;
    max-width: 480px;
  }
}

@media (max-width: 768px) {
  .how-it-works {
    padding: 80px 0;
  }

  .coach-daily {
    padding: 80px 0;
  }

  .step-card {
    padding: 28px 20px;
  }

  .coach-card {
    padding: 28px 20px;
  }
}