/* ============================================
   飞哇官网 - 全局样式
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  /* Primary Palette — 深紫到亮紫渐变 */
  --clr-primary-50:  #f5f0ff;
  --clr-primary-100: #ede5ff;
  --clr-primary-200: #ddd0ff;
  --clr-primary-300: #c4abff;
  --clr-primary-400: #a87dff;
  --clr-primary-500: #8b5cf6;
  --clr-primary-600: #7c3aed;
  --clr-primary-700: #6d28d9;
  --clr-primary-800: #5b21b6;
  --clr-primary-900: #4c1d95;

  /* Accent — 活力青 */
  --clr-accent-400: #22d3ee;
  --clr-accent-500: #06b6d4;

  /* Warm Accent — 橙 */
  --clr-warm-400: #fb923c;
  --clr-warm-500: #f97316;

  /* Neutrals */
  --clr-bg:       #09090b;
  --clr-bg-card:  #18181b;
  --clr-bg-card2: #1e1e24;
  --clr-bg-hover: #27272a;
  --clr-surface:  rgba(255,255,255,0.04);
  --clr-border:   rgba(255,255,255,0.08);
  --clr-text:     #fafafa;
  --clr-text-secondary: #a1a1aa;
  --clr-text-muted: #71717a;

  /* Gradients */
  --grad-primary: linear-gradient(135deg, var(--clr-primary-500), var(--clr-accent-500));
  --grad-warm:    linear-gradient(135deg, var(--clr-warm-500), var(--clr-primary-500));
  --grad-hero:    linear-gradient(160deg, #1a0533 0%, #0d0d1a 40%, #09090b 100%);
  --grad-card:    linear-gradient(145deg, rgba(139,92,246,0.08) 0%, rgba(6,182,212,0.04) 100%);

  /* Sizing */
  --max-width: 1200px;
  --nav-height: 72px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* Shadows */
  --shadow-glow: 0 0 60px rgba(139,92,246,0.15);
  --shadow-card: 0 4px 24px rgba(0,0,0,0.3);
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.25s;
}

img {
  max-width: 100%;
  display: block;
}

ul { list-style: none; }

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

/* ---------- 通用文字渐变 ---------- */
.gradient-text {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  z-index: 1000;
  transition: background 0.3s, box-shadow 0.3s, backdrop-filter 0.3s;
}

.navbar.scrolled {
  background: rgba(9,9,11,0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  box-shadow: 0 1px 0 var(--clr-border);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.25rem;
  z-index: 1001;
}

.logo-icon {
  font-size: 1.5rem;
}

.logo-text {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--clr-text-secondary);
  transition: color 0.25s;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--grad-primary);
  border-radius: 1px;
  transition: width 0.3s;
}

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

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

.nav-cta {
  padding: 8px 20px;
  border-radius: 999px;
  background: var(--grad-primary);
  font-size: 0.875rem;
  font-weight: 600;
  color: #fff;
  transition: opacity 0.25s, transform 0.25s;
}

.nav-cta:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1001;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--clr-text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

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

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

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

/* ============================================
   按钮
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: inherit;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.3s;
  text-decoration: none;
}

.btn-primary {
  background: var(--grad-primary);
  color: #fff;
  padding: 12px 28px;
  border-radius: 999px;
  font-size: 0.95rem;
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(139,92,246,0.3);
}

.btn-ghost {
  background: transparent;
  color: var(--clr-text-secondary);
  padding: 12px 28px;
  border-radius: 999px;
  border: 1px solid var(--clr-border);
  font-size: 0.95rem;
}

.btn-ghost:hover {
  color: var(--clr-text);
  border-color: rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.04);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 1rem;
}

.btn-xl {
  padding: 18px 40px;
  font-size: 1.1rem;
}

/* ============================================
   Section 通用样式
   ============================================ */
.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(139,92,246,0.12);
  color: var(--clr-primary-400);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--clr-text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

/* ============================================
   Hero
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--grad-hero);
  overflow: hidden;
  padding-top: var(--nav-height);
}

.hero-bg-shapes {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.shape {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
}

.shape-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--clr-primary-700), transparent 70%);
  top: -100px;
  right: -100px;
  animation: float 8s ease-in-out infinite;
}

.shape-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--clr-accent-500), transparent 70%);
  bottom: -50px;
  left: -50px;
  opacity: 0.2;
  animation: float 10s ease-in-out infinite reverse;
}

.shape-3 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--clr-warm-500), transparent 70%);
  top: 40%;
  left: 30%;
  opacity: 0.1;
  animation: float 12s ease-in-out infinite;
}

.hero-grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(139,92,246,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139,92,246,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-30px) scale(1.05); }
}

.hero-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 80px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(139,92,246,0.12);
  border: 1px solid rgba(139,92,246,0.2);
  font-size: 0.85rem;
  color: var(--clr-primary-300);
  margin-bottom: 24px;
  animation: fadeInUp 0.6s ease-out;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #34d399;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
  font-size: 4rem;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 24px;
  animation: fadeInUp 0.6s ease-out 0.1s both;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--clr-text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 520px;
  animation: fadeInUp 0.6s ease-out 0.2s both;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
  animation: fadeInUp 0.6s ease-out 0.3s both;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 28px;
  animation: fadeInUp 0.6s ease-out 0.4s both;
}

.stat-item {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-suffix {
  font-size: 1.2rem;
  font-weight: 700;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  display: block;
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  margin-top: 4px;
}

.stat-divider {
  width: 1px;
  height: 36px;
  background: var(--clr-border);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- Hero 手机 Mockup ---------- */
.hero-visual {
  display: flex;
  justify-content: center;
  animation: fadeInUp 0.8s ease-out 0.3s both;
}

.phone-mockup {
  position: relative;
}

.phone-frame {
  width: 280px;
  height: 570px;
  background: #1a1a2e;
  border-radius: 40px;
  border: 3px solid rgba(255,255,255,0.1);
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow-card), 0 0 0 1px rgba(255,255,255,0.05);
}

.phone-notch {
  width: 120px;
  height: 28px;
  background: var(--clr-bg);
  border-radius: 0 0 20px 20px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.phone-screen {
  padding: 12px 16px;
}

.app-header-mock {
  text-align: center;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.expert-card-mock {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px;
  background: rgba(255,255,255,0.04);
  border-radius: 16px;
  margin-bottom: 10px;
  border: 1px solid rgba(255,255,255,0.06);
  transition: transform 0.3s;
  position: relative;
}

.expert-card-mock:hover {
  transform: scale(1.02);
}

.expert-card-mock.faded {
  opacity: 0.4;
  mask-image: linear-gradient(to bottom, black 0%, transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, black 0%, transparent 100%);
}

.expert-avatar-mock {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: rgba(139,92,246,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.expert-info-mock {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.expert-name-mock {
  font-size: 0.9rem;
  font-weight: 600;
}

.expert-title-mock {
  font-size: 0.72rem;
  color: var(--clr-text-muted);
}

.expert-price-mock {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--clr-primary-400);
}

.online-dot-mock {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #34d399;
  position: absolute;
  top: 14px;
  right: 14px;
  box-shadow: 0 0 8px rgba(52,211,153,0.5);
}

.phone-glow {
  position: absolute;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(139,92,246,0.2), transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: -1;
  filter: blur(40px);
}

/* ============================================
   品牌理念
   ============================================ */
.brand-philosophy {
  padding: 80px 0;
  background: linear-gradient(180deg, var(--clr-bg) 0%, var(--clr-bg-card) 100%);
}

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

.philosophy-card {
  padding: 36px 28px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.philosophy-card:hover {
  transform: translateY(-4px);
  border-color: rgba(139,92,246,0.2);
  box-shadow: var(--shadow-glow);
}

.philosophy-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.philosophy-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.philosophy-card p {
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
  line-height: 1.7;
}

/* ============================================
   核心功能
   ============================================ */
.features {
  padding: 120px 0;
}

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

.feature-card {
  padding: 32px 28px;
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(139,92,246,0.25);
  box-shadow: 0 8px 40px rgba(139,92,246,0.08);
}

.feature-card-large {
  grid-column: span 3;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  background: var(--grad-card);
  border-color: rgba(139,92,246,0.15);
}

.feature-icon-wrap {
  margin-bottom: 16px;
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(139,92,246,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
  line-height: 1.7;
}

.feature-detail {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.price-example {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  background: rgba(255,255,255,0.04);
  border-radius: var(--radius-md);
  border: 1px solid var(--clr-border);
}

.price-label {
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
}

.price-value {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--clr-primary-400);
}

.price-value small {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--clr-text-muted);
}

/* ============================================
   使用流程
   ============================================ */
.how-it-works {
  padding: 120px 0;
  background: linear-gradient(180deg, var(--clr-bg) 0%, #0f0f17 50%, var(--clr-bg) 100%);
}

.steps-container {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 40px;
  max-width: 720px;
  margin: 0 auto;
}

.steps-line {
  position: absolute;
  left: 32px;
  top: 60px;
  bottom: 60px;
  width: 2px;
  background: linear-gradient(to bottom, var(--clr-primary-600), var(--clr-accent-500));
  opacity: 0.3;
}

.step-card {
  display: flex;
  gap: 28px;
  align-items: flex-start;
  position: relative;
}

.step-number {
  flex-shrink: 0;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--grad-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  box-shadow: 0 0 24px rgba(139,92,246,0.3);
  position: relative;
  z-index: 2;
}

.step-content {
  flex: 1;
  padding: 24px 28px;
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
}

.step-icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.step-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-content p {
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.step-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.step-tag {
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(139,92,246,0.1);
  color: var(--clr-primary-300);
  font-size: 0.75rem;
  font-weight: 500;
}

/* ============================================
   定价体系
   ============================================ */
.pricing {
  padding: 120px 0;
}

.pricing-showcase {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.pricing-tier {
  padding: 36px 28px;
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  position: relative;
  transition: transform 0.3s, box-shadow 0.3s;
}

.pricing-tier:hover {
  transform: translateY(-4px);
}

.pricing-tier-featured {
  border-color: rgba(139,92,246,0.4);
  background: var(--grad-card);
  box-shadow: 0 0 60px rgba(139,92,246,0.1);
  transform: scale(1.04);
}

.pricing-tier-featured:hover {
  transform: scale(1.04) translateY(-4px);
}

.tier-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 16px;
  border-radius: 999px;
  background: var(--grad-primary);
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
}

.tier-header {
  padding: 20px;
  border-radius: var(--radius-lg);
  text-align: center;
  margin-bottom: 20px;
}

.tier-basic {
  background: linear-gradient(135deg, rgba(34,211,153,0.1), rgba(34,211,153,0.02));
}

.tier-pro {
  background: linear-gradient(135deg, rgba(139,92,246,0.15), rgba(6,182,212,0.05));
}

.tier-premium {
  background: linear-gradient(135deg, rgba(249,115,22,0.1), rgba(249,115,22,0.02));
}

.tier-range {
  display: block;
  font-size: 1.8rem;
  font-weight: 900;
}

.tier-basic .tier-range { color: #34d399; }
.tier-pro .tier-range { color: var(--clr-primary-400); }
.tier-premium .tier-range { color: var(--clr-warm-400); }

.tier-unit {
  font-size: 0.85rem;
  color: var(--clr-text-muted);
}

.tier-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.tier-desc {
  font-size: 0.85rem;
  color: var(--clr-text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.tier-features {
  margin-bottom: 20px;
}

.tier-features li {
  font-size: 0.85rem;
  color: var(--clr-text-secondary);
  padding: 6px 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}

.tier-features li:last-child {
  border-bottom: none;
}

.tier-personas {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tier-personas span {
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,0.04);
  font-size: 0.75rem;
  color: var(--clr-text-muted);
}

.pricing-note {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 24px 28px;
  background: rgba(139,92,246,0.06);
  border: 1px solid rgba(139,92,246,0.15);
  border-radius: var(--radius-lg);
}

.note-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.note-content h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.note-content p {
  font-size: 0.85rem;
  color: var(--clr-text-secondary);
  line-height: 1.7;
}

/* ============================================
   咨询类目
   ============================================ */
.categories {
  padding: 120px 0;
  background: var(--clr-bg);
}

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

.category-card {
  padding: 24px;
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  transition: transform 0.3s, border-color 0.3s;
}

.category-card:hover {
  transform: translateY(-4px);
  border-color: rgba(139, 92, 246, 0.25);
}

.category-card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.category-emoji {
  font-size: 1.6rem;
}

.category-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
}

.category-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.category-tag {
  display: inline-block;
  padding: 4px 10px;
  font-size: 0.78rem;
  color: var(--clr-text-secondary);
  background: rgba(139, 92, 246, 0.08);
  border: 1px solid rgba(139, 92, 246, 0.15);
  border-radius: 999px;
}

.category-tag-k12 {
  color: #fbbf24;
  background: rgba(251, 191, 36, 0.1);
  border-color: rgba(251, 191, 36, 0.25);
}

.categories-note {
  margin-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--clr-text-muted);
}

/* ============================================
   应用场景
   ============================================ */
.scenarios {
  padding: 120px 0;
  background: linear-gradient(180deg, var(--clr-bg) 0%, #0d0d17 50%, var(--clr-bg) 100%);
}

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

.scenario-card {
  padding: 28px 24px;
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  transition: transform 0.3s, border-color 0.3s;
}

.scenario-card:hover {
  transform: translateY(-4px);
  border-color: rgba(139,92,246,0.25);
}

.scenario-emoji {
  font-size: 2rem;
  margin-bottom: 12px;
}

.scenario-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.scenario-card p {
  font-size: 0.85rem;
  color: var(--clr-text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.scenario-example {
  padding: 12px 16px;
  background: rgba(139,92,246,0.06);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--clr-primary-600);
}

.scenario-quote {
  font-size: 0.8rem;
  font-style: italic;
  color: var(--clr-primary-300);
  line-height: 1.6;
}

/* ============================================
   为什么选择飞哇
   ============================================ */
.why-us {
  padding: 120px 0;
}

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

.why-card {
  padding: 32px 28px;
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  transition: transform 0.3s, border-color 0.3s;
}

.why-card:hover {
  transform: translateY(-4px);
  border-color: rgba(139,92,246,0.2);
}

.why-number {
  font-size: 2.5rem;
  font-weight: 900;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  opacity: 0.6;
  margin-bottom: 12px;
}

.why-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.why-card p {
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
  line-height: 1.7;
}

/* ============================================
   安全保障
   ============================================ */
.security {
  padding: 120px 0;
  background: linear-gradient(180deg, var(--clr-bg) 0%, #0a0a14 50%, var(--clr-bg) 100%);
}

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

.security-card {
  padding: 32px 28px;
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: transform 0.3s, border-color 0.3s;
}

.security-card:hover {
  transform: translateY(-4px);
  border-color: rgba(139,92,246,0.2);
}

.security-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.security-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.security-card p {
  font-size: 0.85rem;
  color: var(--clr-text-secondary);
  line-height: 1.7;
}

/* ============================================
   用户故事
   ============================================ */
.testimonials {
  padding: 120px 0;
}

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

.testimonial-card {
  padding: 32px 28px;
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  transition: transform 0.3s, border-color 0.3s;
}

.testimonial-card:hover {
  transform: translateY(-4px);
  border-color: rgba(139,92,246,0.2);
}

.testimonial-stars {
  font-size: 0.9rem;
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.testimonial-text {
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(139,92,246,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.author-info {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-size: 0.9rem;
  font-weight: 600;
}

.author-role {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
}

.author-price {
  font-size: 0.75rem;
  color: var(--clr-primary-400);
  font-weight: 500;
}

/* ============================================
   FAQ
   ============================================ */
.faq {
  padding: 120px 0;
  background: linear-gradient(180deg, var(--clr-bg) 0%, #0d0d17 100%);
}

.faq-list {
  max-width: 760px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--clr-border);
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  background: none;
  border: none;
  color: var(--clr-text);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: color 0.25s;
}

.faq-question:hover {
  color: var(--clr-primary-400);
}

.faq-arrow {
  flex-shrink: 0;
  transition: transform 0.3s;
  color: var(--clr-text-muted);
}

.faq-item.active .faq-arrow {
  transform: rotate(180deg);
  color: var(--clr-primary-400);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding-bottom: 20px;
}

.faq-answer p {
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
  line-height: 1.8;
}

/* ============================================
   下载 CTA
   ============================================ */
.download {
  padding: 120px 0;
  position: relative;
  overflow: hidden;
}

.download::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(139,92,246,0.1) 0%, transparent 70%);
  pointer-events: none;
}

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

.download-title {
  font-size: 3rem;
  font-weight: 900;
  margin-bottom: 20px;
}

.download-desc {
  font-size: 1.1rem;
  color: var(--clr-text-secondary);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

.download-actions {
  margin-bottom: 40px;
}

.download-qr {
  display: flex;
  justify-content: center;
}

.qr-placeholder {
  width: 120px;
  height: 140px;
  border-radius: var(--radius-lg);
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.qr-placeholder span {
  font-size: 2rem;
}

.qr-placeholder p {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
}

/* ============================================
   页脚
   ============================================ */
.footer {
  padding: 64px 0 32px;
  border-top: 1px solid var(--clr-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.footer-tagline {
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
  margin-bottom: 8px;
}

.footer-company {
  font-size: 0.8rem;
  color: var(--clr-text-muted);
}

.footer-links-group h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-links-group ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links-group a {
  font-size: 0.85rem;
  color: var(--clr-text-muted);
  transition: color 0.25s;
}

.footer-links-group a:hover {
  color: var(--clr-primary-400);
}

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

.footer-bottom p {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
}

.footer-bottom a {
  color: var(--clr-text-muted);
  text-decoration: underline;
}

.footer-bottom a:hover {
  color: var(--clr-primary-400);
}

/* ============================================
   滚动动画
   ============================================ */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

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

/* Tablet */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

  .hero-subtitle {
    margin: 0 auto 36px;
  }

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

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

  .hero-title {
    font-size: 3rem;
  }

  .feature-card-large {
    grid-column: span 3;
    grid-template-columns: 1fr;
  }

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

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

  .pricing-showcase {
    grid-template-columns: 1fr;
    max-width: 420px;
    margin: 0 auto 40px;
  }

  .pricing-tier-featured {
    transform: none;
    order: -1;
  }

  .pricing-tier-featured:hover {
    transform: translateY(-4px);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

/* Mobile */
@media (max-width: 768px) {
  .section-title {
    font-size: 2rem;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    flex-direction: column;
    background: rgba(9,9,11,0.98);
    backdrop-filter: blur(20px);
    padding: 100px 32px 32px;
    gap: 24px;
    transition: right 0.35s ease;
    z-index: 999;
    border-left: 1px solid var(--clr-border);
  }

  .nav-links.open {
    right: 0;
  }

  .nav-cta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-container {
    padding: 60px 24px;
  }

  .phone-frame {
    width: 240px;
    height: 490px;
  }

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

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

  .feature-card-large {
    grid-column: span 1;
    grid-template-columns: 1fr;
  }

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

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

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

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

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .download-title {
    font-size: 2rem;
  }

  .steps-line {
    display: none;
  }

  .step-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .step-content {
    width: 100%;
  }

  .step-tags {
    justify-content: center;
  }

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

/* Small Mobile */
@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-stats {
    flex-direction: column;
    gap: 16px;
  }

  .stat-divider {
    width: 40px;
    height: 1px;
  }

  .section-title {
    font-size: 1.6rem;
  }
}