/* ============================================================
   驿通AI查件机器人 官网样式
   Design: 科技政务风 × 现代SaaS美学
   Author: Frontend Developer
   ============================================================ */

/* ----- CSS Custom Properties ----- */
:root {
  --color-deep: #0F3B5C;
  --color-navy: #173E5C;
  --color-blue-mid: #1B5A8A;
  --color-light-blue: #E8F4FD;
  --color-green: #0D904F;
  --color-green-dark: #076428;
  --color-green-light: #E8F5EE;
  --color-gold: #F5A623;
  --color-gold-dark: #E09000;
  --color-gold-light: #FFF8ED;
  --color-bg: #F5F6FA;
  --color-white: #FFFFFF;
  --color-text: #2C3E50;
  --color-text-light: #5A6C7D;
  --color-text-lighter: #8899A6;
  --color-border: #E2E8F0;
  --color-border-light: #EDF2F7;
  --color-red: #E74C3C;
  --color-red-light: #FDF2F2;
  --shadow-sm: 0 1px 3px rgba(15,59,92,0.06);
  --shadow-md: 0 4px 12px rgba(15,59,92,0.08);
  --shadow-lg: 0 8px 32px rgba(15,59,92,0.10);
  --shadow-xl: 0 16px 48px rgba(15,59,92,0.12);
  --shadow-card: 0 2px 8px rgba(15,59,92,0.06), 0 8px 24px rgba(15,59,92,0.04);
  --font: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --space-xs: 4px; --space-sm: 8px; --space-md: 16px; --space-lg: 24px;
  --space-xl: 32px; --space-2xl: 48px; --space-3xl: 64px; --space-4xl: 96px;
  --radius-sm: 6px; --radius-md: 10px; --radius-lg: 16px; --radius-xl: 24px; --radius-full: 9999px;
  --transition-fast: 0.15s ease; --transition: 0.3s ease; --transition-slow: 0.5s cubic-bezier(0.4,0,0.2,1);
  --max-width: 1200px; --nav-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-blue-mid); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-green); }
button { font-family: inherit; cursor: pointer; border: none; outline: none; }

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

/* ----- Typography ----- */
.section-label {
  display: inline-block;
  font-size: 13px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 2.5px;
  color: var(--color-green);
  margin-bottom: var(--space-md);
  position: relative; padding-left: 28px;
}
.section-label::before {
  content: ''; position: absolute; left: 0; top: 50%;
  transform: translateY(-50%);
  width: 20px; height: 2.5px;
  background: var(--color-green); border-radius: 2px;
}
.section-title {
  font-size: 38px; font-weight: 800;
  color: var(--color-deep);
  margin-bottom: var(--space-md);
  line-height: 1.2;
  letter-spacing: -0.5px;
}
.section-subtitle {
  font-size: 17px; color: var(--color-text-light);
  max-width: 600px; margin: 0 auto;
}
.section-header { text-align: center; margin-bottom: var(--space-3xl); }

/* ----- Divider (for merged sections) ----- */
.features-divider, .calc-divider {
  text-align: center;
  margin-top: var(--space-4xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--color-border-light);
  margin-bottom: var(--space-3xl);
}

/* ----- Buttons ----- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-size: 15px; font-weight: 600;
  padding: 15px 36px;
  border-radius: var(--radius-full);
  transition: all var(--transition);
  white-space: nowrap; letter-spacing: 0.3px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-dark));
  color: #fff;
  box-shadow: 0 4px 20px rgba(245,166,35,0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(245,166,35,0.5);
}
.btn-outline {
  background: transparent; color: #fff;
  border: 2px solid rgba(255,255,255,0.4);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.7);
}
.btn-green {
  background: linear-gradient(135deg, var(--color-green), var(--color-green-dark));
  color: #fff;
  box-shadow: 0 4px 20px rgba(13,144,79,0.3);
}
.btn-green:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(13,144,79,0.45);
}
.btn-white {
  background: #fff; color: var(--color-deep);
  box-shadow: var(--shadow-md);
}
.btn-white:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-height);
  background: rgba(255,255,255,0.94);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}
.nav.scrolled { border-bottom-color: var(--color-border); box-shadow: var(--shadow-sm); }
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 100%; max-width: var(--max-width);
  margin: 0 auto; padding: 0 var(--space-lg);
}
.nav-brand { display: flex; align-items: center; gap: 10px; }
.nav-brand img { height: 42px; width: 42px; border-radius: 50%; }
.nav-brand span { font-size: 20px; font-weight: 800; color: var(--color-deep); letter-spacing: 1px; }
.nav-links { display: flex; align-items: center; gap: var(--space-xl); list-style: none; }
.nav-links a {
  font-size: 15px; color: var(--color-text); font-weight: 500;
  padding: 4px 0; position: relative;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: 0; left: 0;
  width: 0; height: 2px; background: var(--color-green); border-radius: 2px;
  transition: width var(--transition);
}
.nav-links a:hover::after { width: 100%; }
.nav-cta { display: flex; align-items: center; gap: var(--space-md); }
.nav-cta .btn { padding: 10px 24px; font-size: 14px; }

/* Download Dropdown */
.nav-downloads { position: relative; }
.btn-download-toggle {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 20px;
  font-size: 14px; font-weight: 600;
  background: var(--color-green-light);
  color: var(--color-green);
  border-radius: var(--radius-full);
  transition: all var(--transition);
  border: 1px solid transparent;
}
.btn-download-toggle:hover {
  background: var(--color-green);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(13,144,79,0.3);
}
.btn-download-toggle svg { width: 16px; height: 16px; flex-shrink: 0; }

.download-dropdown {
  position: absolute; top: calc(100% + 8px); right: 0;
  background: #fff; border-radius: var(--radius-md);
  box-shadow: 0 8px 40px rgba(15,59,92,0.18);
  border: 1px solid var(--color-border);
  min-width: 320px;
  padding: var(--space-sm);
  opacity: 0; visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition);
  z-index: 1001;
}
.download-dropdown.open {
  opacity: 1; visibility: visible;
  transform: translateY(0);
}
.download-item {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  transition: all var(--transition-fast);
  text-decoration: none;
}
.download-item:hover {
  background: var(--color-bg);
  color: var(--color-deep);
}
.download-item svg {
  width: 20px; height: 20px;
  color: var(--color-green);
  flex-shrink: 0;
}
.download-item div { display: flex; flex-direction: column; gap: 2px; }
.download-item div strong {
  font-size: 14px; font-weight: 600; color: var(--color-deep);
}
.download-item div span {
  font-size: 11px; color: var(--color-text-lighter);
}
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; padding: 8px; }
.nav-toggle span {
  width: 26px; height: 2.5px; background: var(--color-deep);
  border-radius: 2px; transition: all var(--transition);
}

/* ----- Mobile Menu ----- */
.mobile-menu {
  position: fixed; top: var(--nav-height); left: 0; right: 0; bottom: 0;
  background: rgba(255,255,255,0.98);
  backdrop-filter: blur(20px);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: var(--space-xl);
  z-index: 999;
  transform: translateY(-100%);
  opacity: 0;
  transition: all var(--transition-slow);
  pointer-events: none;
}
.mobile-menu.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: all;
}
.mobile-menu a {
  font-size: 20px; font-weight: 600; color: var(--color-deep);
  transition: color var(--transition-fast);
}
.mobile-menu a:hover { color: var(--color-green); }
.mobile-menu .btn { width: 200px; }

/* Mobile Download Buttons */
.mobile-downloads {
  display: flex; flex-direction: column; align-items: center;
  gap: 10px; margin-top: var(--space-md);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border-light);
}
.mobile-downloads .btn {
  width: 220px; font-size: 14px; padding: 13px 24px;
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  min-height: 100vh;
  display: flex; align-items: center;
  position: relative; overflow: hidden;
  background: linear-gradient(160deg, #091E33 0%, #0F3B5C 25%, #173E5C 55%, #1A4A6E 100%);
  padding-top: var(--nav-height);
}
.hero-mesh {
  position: absolute; inset: 0;
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(13,144,79,0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(245,166,35,0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 20%, rgba(27,90,138,0.1) 0%, transparent 50%);
  pointer-events: none;
}
.hero-grid {
  position: absolute; inset: 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;
  pointer-events: none;
}
.hero-inner {
  position: relative; z-index: 2;
  max-width: var(--max-width); margin: 0 auto;
  padding: 0 var(--space-lg);
  display: grid; grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl); align-items: center; width: 100%;
}
.hero-left { color: #fff; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.15);
  padding: 8px 20px; border-radius: var(--radius-full);
  font-size: 13px; letter-spacing: 1px;
  margin-bottom: var(--space-lg);
  backdrop-filter: blur(10px);
}
.hero-badge .dot {
  width: 8px; height: 8px; background: var(--color-green);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(1.6); }
}
.hero-left h1 {
  font-size: 52px; font-weight: 800;
  line-height: 1.15; margin-bottom: var(--space-lg);
  letter-spacing: -1px;
}
.hero-left h1 em {
  font-style: normal;
  background: linear-gradient(135deg, var(--color-gold), #FFD700);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-left p.hero-desc {
  font-size: 18px; color: rgba(255,255,255,0.7);
  line-height: 1.8; margin-bottom: var(--space-xl); max-width: 440px;
}
.hero-btns { display: flex; gap: var(--space-md); flex-wrap: wrap; }
.hero-stats {
  display: flex; gap: var(--space-2xl);
  margin-top: var(--space-2xl); padding-top: var(--space-lg);
  border-top: 1px solid rgba(255,255,255,0.1);
}
.hero-stat { text-align: center; }
.hero-stat .num { font-size: 32px; font-weight: 800; color: var(--color-gold); }
.hero-stat .lbl { font-size: 13px; color: rgba(255,255,255,0.5); margin-top: 4px; }

.hero-right {
  display: flex; align-items: center; justify-content: center;
  position: relative;
}
.hero-logo-ring {
  position: relative;
  width: 300px; height: 300px;
}
.hero-logo-ring .ring {
  position: absolute; inset: -20px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.08);
  animation: spin-slow 30s linear infinite;
}
.hero-logo-ring .ring:nth-child(2) {
  inset: -40px;
  border-color: rgba(13,144,79,0.12);
  animation-duration: 45s;
  animation-direction: reverse;
}
.hero-logo-ring .ring:nth-child(3) {
  inset: -60px;
  border-color: rgba(245,166,35,0.08);
  animation-duration: 60s;
}
@keyframes spin-slow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
.hero-logo-circle {
  width: 100%; height: 100%;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
  border: 2px solid rgba(255,255,255,0.12);
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
  animation: float 6s ease-in-out infinite;
  box-shadow: 0 0 100px rgba(13,144,79,0.15);
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-18px); }
}
.hero-logo-circle img {
  width: 85%; height: 85%;
  border-radius: 50%;
  object-fit: cover;
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute; bottom: 32px; left: 50%;
  transform: translateX(-50%); z-index: 3;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: rgba(255,255,255,0.4);
  font-size: 12px; letter-spacing: 1px;
  animation: fade-in-up 1s ease 0.8s both;
}
.scroll-mouse {
  width: 24px; height: 38px;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 12px;
  position: relative;
}
.scroll-mouse::after {
  content: ''; position: absolute;
  top: 8px; left: 50%; transform: translateX(-50%);
  width: 4px; height: 8px;
  background: rgba(255,255,255,0.5);
  border-radius: 2px;
  animation: scroll-wheel 1.5s ease-in-out infinite;
}
@keyframes scroll-wheel {
  0% { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(12px); }
}
@keyframes fade-in-up {
  from { opacity: 0; transform: translateX(-50%) translateY(20px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ============================================================
   SUPPORTED PLATFORMS SECTION
   ============================================================ */
.supported-platforms {
  padding: var(--space-3xl) 0;
  background: var(--color-white);
  border-top: 1px solid var(--color-border-light);
}
.platforms-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  max-width: 900px;
  margin: 0 auto;
}
.platform-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  transition: all var(--transition);
}
.platform-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-blue-mid);
}
.platform-logo-box {
  width: 48px; height: 48px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.platform-logo-box svg { width: 48px; height: 48px; }
.platform-item span {
  font-size: 15px; font-weight: 600;
  color: var(--color-deep);
}
.platforms-note {
  text-align: center;
  font-size: 12px;
  color: var(--color-text-lighter);
  margin-top: var(--space-lg);
}

/* 22系统完整文字列表 */
.platforms-full-list {
  max-width: 900px;
  margin: var(--space-xl) auto 0;
  text-align: center;
}
.platforms-full-badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 15px; font-weight: 700;
  color: var(--color-green);
  margin-bottom: var(--space-lg);
}
.platforms-full-badge svg {
  width: 20px; height: 20px;
  background: var(--color-green-light);
  border-radius: 50%; padding: 3px;
}
.platforms-tags {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 8px;
}
.platforms-tags span {
  display: inline-block;
  font-size: 13px; font-weight: 500;
  color: var(--color-text-light);
  background: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-full);
  padding: 6px 16px;
  transition: all var(--transition-fast);
}
.platforms-tags span:hover {
  color: var(--color-deep);
  border-color: var(--color-blue-mid);
  background: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* ============================================================
   PAIN POINTS SECTION
   ============================================================ */
.pain-points {
  padding: var(--space-4xl) 0;
  background: var(--color-white);
}
.pain-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}
.pain-card {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition);
  position: relative; overflow: hidden;
}
.pain-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--color-red), #F0A0A0);
  transform: scaleX(0); transform-origin: left;
  transition: transform var(--transition-slow);
}
.pain-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-xl); }
.pain-card:hover::before { transform: scaleX(1); }
.pain-icon {
  width: 56px; height: 56px;
  border-radius: var(--radius-md);
  background: var(--color-red-light);
  display: flex; align-items: center; justify-content: center;
  font-size: 28px; margin-bottom: var(--space-lg);
}
.pain-card h3 { font-size: 19px; color: var(--color-deep); margin-bottom: var(--space-sm); }
.pain-card p { font-size: 14px; color: var(--color-text-light); line-height: 1.8; }
.pain-solution {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: var(--space-md); font-size: 13px; font-weight: 700;
  color: var(--color-green); padding: 6px 16px;
  background: var(--color-green-light); border-radius: var(--radius-full);
}

/* ============================================================
   FEATURES SECTION
   ============================================================ */
.features {
  padding: var(--space-4xl) 0;
  background: var(--color-bg);
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}
.feature-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition);
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-xl); }
.feat-icon {
  width: 60px; height: 60px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 28px; margin-bottom: var(--space-lg);
}
.feature-card:nth-child(1) .feat-icon { background: #EBF5FB; }
.feature-card:nth-child(2) .feat-icon { background: var(--color-green-light); }
.feature-card:nth-child(3) .feat-icon { background: #F4ECF7; }
.feature-card:nth-child(4) .feat-icon { background: var(--color-gold-light); }
.feature-card:nth-child(5) .feat-icon { background: #E8F8F5; }
.feature-card:nth-child(6) .feat-icon { background: var(--color-red-light); }
.feature-card:nth-child(7) .feat-icon { background: #E8F8F5; }
.feature-card:nth-child(8) .feat-icon { background: #F4ECF7; }
.feature-card h3 { font-size: 18px; color: var(--color-deep); margin-bottom: var(--space-sm); }
.feature-card p { font-size: 14px; color: var(--color-text-light); line-height: 1.8; }

/* ============================================================
   HOW IT WORKS SECTION
   ============================================================ */
.how-it-works {
  padding: var(--space-4xl) 0;
  background: var(--color-white);
}
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  position: relative;
}
.steps-line {
  position: absolute; top: 70px; left: 15%; right: 15%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-border), var(--color-green), var(--color-border));
  z-index: 0;
}
.step-card {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl) var(--space-xl);
  text-align: center; position: relative; z-index: 1;
  transition: all var(--transition);
  border: 1px solid var(--color-border-light);
}
.step-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-xl); }
.step-num {
  width: 64px; height: 64px; border-radius: 50%;
  background: linear-gradient(135deg, var(--color-green), var(--color-green-dark));
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 26px; font-weight: 800;
  margin: 0 auto var(--space-lg);
  box-shadow: 0 4px 20px rgba(13,144,79,0.3);
}
.step-card h3 { font-size: 18px; color: var(--color-deep); margin-bottom: var(--space-sm); }
.step-card p { font-size: 14px; color: var(--color-text-light); }

.step-metrics {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg); margin-top: var(--space-2xl);
}
.step-metric {
  text-align: center; padding: var(--space-lg);
  background: var(--color-green-light); border-radius: var(--radius-md);
}
.step-metric .m-num { font-size: 28px; font-weight: 800; color: var(--color-green); }
.step-metric .m-lbl { font-size: 13px; color: var(--color-text-light); margin-top: 4px; }

/* ============================================================
   PLATFORMS SECTION
   ============================================================ */
.platforms {
  padding: var(--space-4xl) 0;
  background: var(--color-bg);
}
.platform-tabs {
  display: flex; justify-content: center; gap: var(--space-sm);
  margin-bottom: var(--space-2xl); flex-wrap: wrap;
}
.platform-tab {
  padding: 12px 28px; border-radius: var(--radius-full);
  font-size: 14px; font-weight: 600;
  background: var(--color-white); color: var(--color-text);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}
.platform-tab.active {
  background: var(--color-deep); color: #fff;
  border-color: var(--color-deep); box-shadow: var(--shadow-md);
}
.platform-tab:hover:not(.active) { border-color: var(--color-deep); color: var(--color-deep); }
.platform-content { display: none; }
.platform-content.active {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl); align-items: center;
  background: var(--color-white); border-radius: var(--radius-xl);
  padding: var(--space-2xl); box-shadow: var(--shadow-md);
}
.platform-text h3 { font-size: 24px; color: var(--color-deep); margin-bottom: var(--space-lg); }
.platform-features { list-style: none; display: flex; flex-direction: column; gap: var(--space-md); }
.platform-features li {
  display: flex; align-items: flex-start; gap: 10px;
  font-size: 15px; color: var(--color-text);
}
.platform-features .pf-check {
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--color-green-light); color: var(--color-green);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; flex-shrink: 0; margin-top: 2px;
}
.platform-visual {
  background: linear-gradient(135deg, var(--color-bg), #E8ECF1);
  border-radius: var(--radius-lg);
  display: flex; align-items: center; justify-content: center;
  min-height: 300px; font-size: 84px; color: var(--color-text-lighter);
}

/* ============================================================
   CALCULATOR SECTION
   ============================================================ */
.calculator {
  padding: var(--space-4xl) 0;
  background: linear-gradient(160deg, var(--color-deep), var(--color-navy));
  color: #fff;
}
.calculator .section-label { color: var(--color-gold); }
.calculator .section-label::before { background: var(--color-gold); }
.calculator .section-title { color: #fff; }
.calculator .section-subtitle { color: rgba(255,255,255,0.6); }
.calc-box {
  max-width: 800px; margin: 0 auto;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-xl); padding: var(--space-2xl);
  backdrop-filter: blur(10px);
}
.calc-slider { margin-bottom: var(--space-2xl); }
.calc-slider-header {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: var(--space-md);
}
.calc-slider-header label { font-size: 15px; font-weight: 600; }
.calc-slider-header .val { font-size: 32px; font-weight: 800; color: var(--color-gold); }
.calc-slider-header .unit { font-size: 14px; color: rgba(255,255,255,0.5); }
input[type="range"] {
  -webkit-appearance: none; width: 100%; height: 8px;
  border-radius: 4px; background: rgba(255,255,255,0.15); outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 30px; height: 30px; border-radius: 50%;
  background: var(--color-gold); cursor: pointer;
  box-shadow: 0 2px 12px rgba(245,166,35,0.5);
  transition: transform var(--transition-fast);
}
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.2); }
.calc-results {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}
.calc-r {
  background: rgba(255,255,255,0.06);
  border-radius: var(--radius-md); padding: var(--space-lg);
  text-align: center; border: 1px solid rgba(255,255,255,0.08);
}
.calc-r .r-label { font-size: 13px; color: rgba(255,255,255,0.5); margin-bottom: 12px; }
.calc-r .r-val { font-size: 36px; font-weight: 800; }
.calc-r.sms .r-val { color: #F08080; }
.calc-r.yitong .r-val { color: var(--color-green); }
.calc-r.saved .r-val { color: var(--color-gold); }
.calc-r .r-note { font-size: 12px; color: rgba(255,255,255,0.35); margin-top: 6px; }

/* ============================================================
   PRICING SECTION
   ============================================================ */
.pricing {
  padding: var(--space-4xl) 0;
  background: var(--color-white);
}
.pricing-cards {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg); max-width: 900px; margin: 0 auto;
}
.price-card {
  background: var(--color-bg);
  border-radius: var(--radius-lg); padding: var(--space-2xl);
  text-align: center;
  border: 2px solid var(--color-border-light);
  transition: all var(--transition);
  position: relative;
}
.price-card.featured {
  background: var(--color-white);
  border-color: var(--color-gold);
  box-shadow: var(--shadow-xl);
  transform: scale(1.05);
}
.price-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-xl); }
.price-card.featured:hover { transform: scale(1.05) translateY(-6px); }
.popular-tag {
  position: absolute; top: -15px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-dark));
  color: #fff; padding: 8px 24px;
  border-radius: var(--radius-full);
  font-size: 12px; font-weight: 700; letter-spacing: 1px;
  white-space: nowrap;
}
.price-card .plan { font-size: 18px; font-weight: 700; color: var(--color-deep); margin-bottom: var(--space-sm); }
.price-card .tagline { font-size: 13px; color: var(--color-text-lighter); margin-bottom: var(--space-lg); }
.price-card .price { margin-bottom: var(--space-lg); }
.price-card .price .cur { font-size: 22px; font-weight: 600; vertical-align: top; }
.price-card .price .amt { font-size: 52px; font-weight: 800; color: var(--color-deep); line-height: 1; }
.price-card .price .per { font-size: 14px; color: var(--color-text-light); }
.price-list { list-style: none; text-align: left; margin-bottom: var(--space-xl); }
.price-list li {
  padding: 10px 0; font-size: 14px; color: var(--color-text);
  display: flex; align-items: center; gap: 10px;
  border-bottom: 1px solid var(--color-border-light);
}
.price-list li:last-child { border-bottom: none; }
.price-list .chk { color: var(--color-green); font-weight: 700; font-size: 16px; }
.price-card .btn { width: 100%; }

/* ============================================================
   TESTIMONIALS SECTION
   ============================================================ */
.testimonials {
  padding: var(--space-4xl) 0;
  background: var(--color-bg);
}
.testimonial-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}
.testimonial-card {
  background: var(--color-white);
  border-radius: var(--radius-lg); padding: var(--space-xl);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition);
}
.testimonial-card:hover { box-shadow: var(--shadow-xl); }
.t-quote { font-size: 38px; color: var(--color-green); opacity: 0.25; margin-bottom: var(--space-md); line-height: 1; }
.t-text { font-size: 15px; color: var(--color-text); line-height: 1.8; margin-bottom: var(--space-lg); }
.t-author {
  display: flex; align-items: center; gap: 12px;
  padding-top: var(--space-md); border-top: 1px solid var(--color-border-light);
}
.t-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  background: linear-gradient(135deg, var(--color-deep), var(--color-blue-mid));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 16px;
}
.t-name { font-size: 15px; font-weight: 600; color: var(--color-deep); }
.t-role { font-size: 12px; color: var(--color-text-lighter); }

/* ============================================================
   SYSTEM REQUIREMENTS SECTION
   ============================================================ */
.sys-req {
  padding: var(--space-4xl) 0;
  background: var(--color-white);
}
.sys-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  max-width: 960px;
  margin: 0 auto;
}
.sys-card {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition);
}
.sys-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.sys-card-icon {
  width: 56px; height: 56px;
  border-radius: var(--radius-md);
  background: var(--color-green-light);
  color: var(--color-green);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: var(--space-lg);
}
.sys-card h3 {
  font-size: 18px; font-weight: 700;
  color: var(--color-deep);
  margin-bottom: var(--space-md);
}
.sys-card ul {
  list-style: none;
  display: flex; flex-direction: column; gap: var(--space-sm);
}
.sys-card ul li {
  font-size: 14px; color: var(--color-text-light);
  padding: 6px 0; border-bottom: 1px solid var(--color-border-light);
}
.sys-card ul li:last-child { border-bottom: none; }
.sys-cta {
  text-align: center;
  margin-top: var(--space-2xl);
  padding: var(--space-xl);
  background: linear-gradient(135deg, var(--color-green-light), #F0FFF4);
  border-radius: var(--radius-lg);
}
.sys-cta p {
  font-size: 16px; color: var(--color-deep);
  margin-bottom: var(--space-lg);
  font-weight: 600;
}

/* ============================================================
   FAQ SECTION
   ============================================================ */
.faq {
  padding: var(--space-4xl) 0;
  background: var(--color-white);
}
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: var(--space-sm); }
.faq-item {
  background: var(--color-bg); border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
  overflow: hidden; transition: all var(--transition);
}
.faq-item.active { border-color: var(--color-green); box-shadow: var(--shadow-md); }
.faq-q {
  width: 100%; padding: var(--space-lg);
  display: flex; justify-content: space-between; align-items: center;
  background: none; font-size: 16px; font-weight: 600;
  color: var(--color-deep); text-align: left;
}
.faq-ico {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--color-green-light); color: var(--color-green);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 700; flex-shrink: 0;
  transition: all var(--transition);
}
.faq-item.active .faq-ico { transform: rotate(45deg); background: var(--color-green); color: #fff; }
.faq-a {
  max-height: 0; overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-slow);
}
.faq-item.active .faq-a { max-height: 400px; }
.faq-a-inner { padding: 0 var(--space-lg) var(--space-lg); font-size: 15px; color: var(--color-text-light); line-height: 1.8; }

/* ============================================================
   CTA SECTION
   ============================================================ */
.cta-section {
  padding: var(--space-4xl) 0;
  background: linear-gradient(160deg, var(--color-deep) 0%, #0A2A3F 100%);
  text-align: center;
  color: #fff;
}

.cta-section h2 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: var(--space-md);
  letter-spacing: -0.5px;
}

.cta-section .cta-subtitle {
  font-size: 17px;
  color: rgba(255,255,255,0.65);
  max-width: 500px;
  margin: 0 auto var(--space-xl);
}

.cta-btns {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-xl);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  padding: var(--space-3xl) 0 var(--space-xl);
  background: #071E2E; color: rgba(255,255,255,0.45);
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl); margin-bottom: var(--space-2xl);
}
.footer-brand { display: flex; flex-direction: column; gap: var(--space-md); }
.footer-logo { display: flex; align-items: center; gap: 10px; }
.footer-logo img { height: 36px; width: 36px; border-radius: 50%; }
.footer-logo span { font-size: 18px; font-weight: 700; color: #fff; }
.footer-brand p { font-size: 13px; line-height: 1.8; max-width: 280px; }
.footer-col h4 { font-size: 14px; font-weight: 700; color: rgba(255,255,255,0.7); margin-bottom: var(--space-md); letter-spacing: 0.5px; }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-sm); }
.footer-col a { font-size: 13px; color: rgba(255,255,255,0.45); transition: color var(--transition-fast); }
.footer-col a:hover { color: var(--color-gold); }
.footer-bottom {
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex; justify-content: space-between; align-items: center;
  font-size: 12px; flex-wrap: wrap; gap: var(--space-sm);
}

/* ============================================================
   SCROLL REVEAL ANIMATIONS
   ============================================================ */
.reveal {
  opacity: 0; transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }
.reveal-delay-6 { transition-delay: 0.6s; }

/* ============================================================
   RESPONSIVE DESIGN
   ============================================================ */

/* Tablet (≤1024px) */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-left h1 { font-size: 40px; }
  .hero-left p.hero-desc { max-width: 100%; margin-left: auto; margin-right: auto; }
  .hero-btns { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-right { margin-top: var(--space-xl); }
  .hero-logo-ring { width: 220px; height: 220px; }
  .hero-logo-ring .ring { display: none; }
  .platform-content.active { grid-template-columns: 1fr; }
  .platform-visual { min-height: 200px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .pricing-cards { max-width: 800px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .platforms-grid { grid-template-columns: repeat(4, 1fr); }
}

/* Small Tablet (≤768px) */
@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
    --space-4xl: 64px;
    --space-3xl: 48px;
    --space-2xl: 36px;
  }

  /* Navigation */
  .nav-links { display: none; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; padding: 10px; }
  .nav-brand img { height: 36px; width: 36px; }
  .nav-brand span { font-size: 16px; }

  /* Typography */
  .section-title { font-size: 28px; }
  .section-subtitle { font-size: 15px; max-width: 100%; padding: 0 var(--space-md); }
  .section-label { font-size: 11px; letter-spacing: 2px; }

  /* Hero */
  .hero { min-height: auto; padding: calc(var(--nav-height) + var(--space-3xl)) 0 var(--space-3xl); }
  .hero-left h1 { font-size: 32px; }
  .hero-left p.hero-desc { font-size: 16px; }
  .hero-stats { gap: var(--space-lg); }
  .hero-stat .num { font-size: 24px; }
  .hero-logo-ring { width: 180px; height: 180px; }

  /* Grid Sections - 1 col */
  .pain-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr; }
  .steps-line { display: none; }
  .step-metrics { grid-template-columns: 1fr; }
  .testimonial-grid { grid-template-columns: 1fr; }
  .calc-results { grid-template-columns: 1fr; }
  .platforms-grid { grid-template-columns: 1fr 1fr; }
  .platforms-tags { gap: 6px; }
  .platforms-tags span { font-size: 12px; padding: 5px 12px; }
  .platforms-full-badge { font-size: 14px; }

  /* Pricing */
  .pricing-cards { grid-template-columns: 1fr; max-width: 400px; }
  .price-card.featured { transform: none; }
  .price-card.featured:hover { transform: translateY(-6px); }

  /* Calculator */
  .calc-box { padding: var(--space-xl); }
  .calc-slider-header .val { font-size: 26px; }

  /* Video & PDF */
  .video-grid { grid-template-columns: 1fr; }
  .pdf-download-card {
    flex-direction: column;
    text-align: center;
    padding: var(--space-lg);
  }

  /* CTA */
  .cta-section h2 { font-size: 28px; }
  .cta-section .cta-subtitle { font-size: 15px; }
  .cta-btns { flex-direction: column; align-items: center; }
  .cta-btns .btn { width: 100%; max-width: 320px; justify-content: center; }
  .contact-grid { flex-direction: column; align-items: center; }
  .contact-grid .contact-card { flex: 1 1 auto; max-width: 320px; width: 100%; }
  .download-row { flex-direction: column; align-items: center; }
  .download-card { width: 100%; max-width: 320px; }

  /* Platform */
  .platform-content.active { padding: var(--space-xl); }
  .platform-tabs { gap: var(--space-sm); }
  .platform-tab { padding: 10px 20px; font-size: 13px; }

  /* FAQ */
  .faq-q { font-size: 15px; padding: var(--space-md); }

  /* System Requirements */
  .sys-grid { grid-template-columns: 1fr; }
  .sys-cta { padding: var(--space-lg); }

  /* Footer */
  .footer { padding: var(--space-2xl) 0 var(--space-lg); }
}

/* Phone (≤480px) */
@media (max-width: 480px) {
  :root {
    --space-4xl: 48px;
    --space-3xl: 36px;
    --space-2xl: 28px;
    --space-xl: 24px;
    --space-lg: 16px;
  }

  .container { padding: 0 var(--space-md); }

  /* Typography */
  .section-title { font-size: 24px; }
  .section-subtitle { font-size: 14px; }

  /* Nav */
  .nav-brand span { font-size: 15px; }

  /* Hero */
  .hero-left h1 { font-size: 26px; letter-spacing: -0.5px; }
  .hero-left p.hero-desc { font-size: 15px; }
  .hero-btns { flex-direction: column; align-items: center; }
  .hero-btns .btn { width: 100%; justify-content: center; }
  .hero-stats { flex-direction: column; gap: var(--space-md); }
  .hero-logo-ring { width: 150px; height: 150px; }
  .hero-badge { font-size: 11px; padding: 6px 14px; }

  /* All grids -> 1 col */
  .feature-grid { grid-template-columns: 1fr; }
  .pain-grid { grid-template-columns: 1fr; }
  .platforms-grid { grid-template-columns: 1fr 1fr; }
  .platforms-tags { gap: 4px; }
  .platforms-tags span { font-size: 11px; padding: 4px 10px; }
  .platforms-full-badge { font-size: 13px; }

  /* Platform */
  .platform-tabs { flex-direction: column; align-items: center; }
  .platform-tab { width: 100%; text-align: center; }

  /* Pricing */
  .price-card .price .amt { font-size: 42px; }
  .popular-tag { font-size: 11px; padding: 6px 18px; top: -12px; }

  /* Calculator */
  .calc-box { padding: var(--space-lg); }
  .calc-r .r-val { font-size: 28px; }

  /* CTA */
  .cta-section h2 { font-size: 24px; }
  .cta-section .cta-subtitle { font-size: 14px; }
  .cta-btns .btn { max-width: 100%; font-size: 15px; padding: 14px 24px; }
  .contact-grid .contact-card { max-width: 100%; }

  /* Footer */
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .footer-brand p { max-width: 100%; }

  /* Mobile menu link sizing */
  .mobile-menu a { font-size: 18px; }

  /* Video & PDF */
  .video-grid { gap: var(--space-md); }
  .video-info { padding: var(--space-sm) var(--space-md); }
  .video-info h3 { font-size: 14px; }
  .pdf-download-card { padding: var(--space-md); }
  .pdf-icon { width: 48px; height: 48px; min-width: 48px; }

  /* FAQ */
  .faq-list { max-width: 100%; }
  .faq-q { font-size: 14px; }
  .faq-a-inner { font-size: 13px; padding: 0 var(--space-md) var(--space-md); }
}

/* Touch-friendly: ensure minimum tap size */
@media (pointer: coarse) {
  .btn, .platform-tab, .nav-toggle, .faq-q, .nav-links a {
    min-height: 44px;
  }
}
/* ============================================================
   VIDEO SHOWCASE
   ============================================================ */
.video-showcase {
  padding: var(--space-4xl) 0;
  background: linear-gradient(160deg, #F8FAFB 0%, #F0F4F8 100%);
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.video-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition);
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.video-wrapper {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 aspect ratio */
  background: #000;
}

.video-wrapper video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-info {
  padding: var(--space-md) var(--space-lg);
}

.video-info h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 4px;
}

.video-info p {
  font-size: 13px;
  color: var(--color-text-light);
}

/* PDF Download Section */
.pdf-download-section {
  margin-top: var(--space-2xl);
}

.pdf-download-card {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  background: #fff;
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-2xl);
  box-shadow: var(--shadow-md);
  border: 2px solid var(--color-border-light);
  transition: all var(--transition);
}

.pdf-download-card:hover {
  border-color: var(--color-red);
  box-shadow: var(--shadow-lg);
}

.pdf-icon {
  width: 64px;
  height: 64px;
  min-width: 64px;
  background: #FDF2F2;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.pdf-info {
  flex: 1;
}

.pdf-info h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 4px;
}

.pdf-info p {
  font-size: 14px;
  color: var(--color-text-light);
}

.pdf-download-card .btn {
  white-space: nowrap;
}

.contact-grid {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  max-width: 700px;
  margin: var(--space-2xl) auto 0;
}

.contact-grid .contact-card {
  flex: 1 1 280px;
  max-width: 320px;
}

.contact-card {
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.contact-card:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.2);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.contact-card .contact-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-md);
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-dark));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.contact-card h4 {
  font-size: 15px;
  font-weight: 600;
  color: rgba(255,255,255,0.9);
  margin-bottom: 8px;
}

.contact-card p {
  font-size: 13px;
  color: rgba(255,255,255,0.55);
  line-height: 1.6;
}

.contact-card .contact-value {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-gold);
  margin-top: 8px;
}

/* QR code inside contact card */
.contact-qr {
  width: 160px;
  height: 160px;
  border-radius: var(--radius-md);
  border: 4px solid #fff;
  background: #fff;
  margin-top: 4px;
}

/* Download Row in CTA */
.download-row {
  display: flex; justify-content: center; gap: var(--space-lg);
  margin-top: var(--space-xl);
  flex-wrap: wrap;
}
.download-card {
  display: flex; flex-direction: column; align-items: flex-start; gap: 6px;
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-md);
  padding: 20px 28px;
  min-width: 240px;
  text-decoration: none;
  transition: all var(--transition);
}
.download-card:hover {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.3);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.25);
}
.download-card svg {
  color: var(--color-gold);
  margin-bottom: 4px;
}
.download-card-title {
  font-size: 16px; font-weight: 700;
  color: #fff;
}
.download-card-desc {
  font-size: 12px;
  color: rgba(255,255,255,0.5);
}
.download-card-tag {
  display: inline-block;
  font-size: 12px; font-weight: 600;
  color: var(--color-gold);
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-full);
  padding: 4px 14px;
  margin-top: 4px;
  transition: all var(--transition-fast);
}
.download-card:hover .download-card-tag {
  background: var(--color-gold);
  color: var(--color-deep);
}

/* ==========================================
   WeChat / X5 Browser Compatibility Fixes
   ========================================== */
@supports not ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
  .nav { background: rgba(255,255,255,0.98); }
  .nav.scrolled { background: rgba(255,255,255,0.98); }
  .cta-section { background: linear-gradient(135deg, #0F3B5C 0%, #1a5a8a 100%); }
  .contact-card { background: rgba(255,255,255,0.12); }
  .download-card { background: rgba(255,255,255,0.12); }
  .mobile-menu { background: rgba(255,255,255,0.99); }
}

/* WeChat Download Tip Overlay */
.wx-tip { position: fixed; inset:0; z-index:10000; display:flex; align-items:center; justify-content:center; opacity:0; pointer-events:none; transition:opacity .3s; }
.wx-tip.show { opacity:1; pointer-events:all; }
.wx-tip-overlay { position:absolute; inset:0; background:rgba(0,0,0,0.5); }
.wx-tip-box { position:relative; background:#fff; border-radius:16px; padding:32px 28px; max-width:320px; width:90%; text-align:center; box-shadow:0 20px 60px rgba(0,0,0,0.25); }
.wx-tip-icon { font-size:40px; margin-bottom:12px; }
.wx-tip-box h4 { font-size:17px; font-weight:700; color:#333; margin-bottom:8px; }
.wx-tip-box p { font-size:14px; color:#666; line-height:1.7; margin-bottom:20px; }
.wx-tip-box p b { color:#07C160; }
.wx-tip-close { display:inline-block; padding:10px 36px; font-size:14px; font-weight:600; color:#fff; background:#07C160; border:none; border-radius:24px; cursor:pointer; }
.wx-tip-close:active { opacity:.8; }