/* ========================================
   安徽小扁担通信科技有限公司 - 官网样式
   Design System: Bento Attio Flat Modern
   ======================================== */

/* --- CSS Variables --- */
:root {
  --color-blue: #2563EB;
  --color-blue-dark: #1D4ED8;
  --color-blue-light: #DBEAFE;
  --color-blue-bg: #EFF6FF;
  --color-orange: #F97316;
  --color-orange-dark: #EA580C;
  --color-orange-light: #FFF7ED;
  --color-orange-bg: #FEF3C7;
  --color-green: #10B981;
  --color-green-dark: #059669;
  --color-green-light: #D1FAE5;
  --color-green-bg: #ECFDF5;
  --color-purple: #7C3AED;
  --color-purple-light: #EDE9FE;
  --color-purple-bg: #F5F3FF;

  --color-bg-dark: #0F172A;
  --color-bg-dark-card: #0F172A;
  --color-bg-dark-orange: #7C2D12;
  --color-bg-dark-green: #064E3B;
  --color-bg-gray: #F9F9FB;
  --color-bg-white: #FFFFFF;

  --color-text-primary: #18191C;
  --color-text-secondary: #6B7280;
  --color-text-white: #FFFFFF;
  --color-text-white-secondary: rgba(255, 255, 255, 0.65);
  --color-text-white-muted: rgba(255, 255, 255, 0.5);

  --color-border: #E8E8EB;
  --color-border-dark: rgba(255, 255, 255, 0.15);

  --font-sans: 'Sarasa Gothic SC', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', system-ui, -apple-system, sans-serif;
  --font-number: 'Inter', system-ui, -apple-system, sans-serif;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 10px 40px rgba(15, 23, 42, 0.08);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 100px;

  --max-width: 1312px; /* 1440 - 64*2 */
  --section-px: 64px;
  --section-py: 96px;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-text-primary);
  background: var(--color-bg-white);
  line-height: 1.6;
  font-size: 16px;
}

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

ul {
  list-style: none;
}

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

/* --- Typography --- */
h1, h2, h3, h4, h5 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text-primary);
}

.text-white { color: var(--color-text-white); }
.text-gray { color: var(--color-text-white-secondary); }
.text-muted { color: var(--color-text-secondary); }
.text-orange { color: var(--color-orange); }
.text-bold { font-weight: 700; }
.text-sm { font-size: 14px; }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  white-space: nowrap;
}

.btn-sm {
  padding: 10px 24px;
  font-size: 15px;
}

.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
}

.btn-primary {
  background: var(--color-blue);
  color: var(--color-text-white);
}
.btn-primary:hover {
  background: var(--color-blue-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text-white);
  border: 1px solid rgba(255, 255, 255, 0.3);
}
.btn-outline:hover {
  background: rgba(255, 255, 255, 0.15);
}

.btn-white {
  background: var(--color-bg-white);
  color: var(--color-blue);
}
.btn-white:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 64px;
  background: var(--color-bg-white);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
}

.header-inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--section-px);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-blue), var(--color-orange));
  flex-shrink: 0;
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text-primary);
}

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

.nav-link {
  font-size: 15px;
  color: var(--color-text-secondary);
  font-weight: 400;
  transition: color 0.2s;
}
.nav-link:hover {
  color: var(--color-blue);
}

.header .btn-primary {
  margin-left: 0;
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0F172A 0%, #1A2942 50%, #1E3A5F 100%);
  padding: 120px var(--section-px) 100px;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--color-text-white);
  font-size: 14px;
  font-weight: 600;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 4px;
  background: var(--color-orange);
  flex-shrink: 0;
}

.hero-title {
  font-size: 56px;
  font-weight: 800;
  color: var(--color-text-white);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--color-text-white-secondary);
  max-width: 560px;
  line-height: 1.7;
}

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

.hero-stats {
  display: flex;
  gap: 64px;
  padding-top: 32px;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-value {
  font-family: var(--font-number);
  font-size: 32px;
  font-weight: 800;
}

.stat-blue { color: var(--color-blue); }
.stat-orange { color: var(--color-orange); }
.stat-green { color: var(--color-green); }

.stat-label {
  font-size: 14px;
  color: var(--color-text-white-muted);
}

/* --- Sections --- */
.section {
  padding: var(--section-py) var(--section-px);
}

.section-gray {
  background: var(--color-bg-gray);
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.section-badge {
  display: inline-flex;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
}

.badge-blue { background: var(--color-blue-bg); color: var(--color-blue); }
.badge-orange { background: var(--color-orange-bg); color: var(--color-orange); }
.badge-green { background: var(--color-green-light); color: var(--color-green-dark); }
.badge-purple { background: var(--color-purple-light); color: var(--color-purple); }

.section-title {
  font-size: 40px;
  font-weight: 700;
}

.section-subtitle {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 500px;
}

.subsection-title {
  font-size: 28px;
  font-weight: 700;
  margin: 40px 0 24px;
}

/* --- Cards Grid --- */
.cards-2, .cards-3, .cards-4 {
  display: grid;
  gap: 24px;
}

.cards-2 { grid-template-columns: 1fr 1fr; }
.cards-3 { grid-template-columns: 1fr 1fr 1fr; }
.cards-4 { grid-template-columns: 1fr 1fr 1fr 1fr; }

/* --- Card Base --- */
.card {
  border-radius: var(--radius-md);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: all 0.3s ease;
}

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

.card-white {
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
}
.card-white:hover {
  box-shadow: var(--shadow-md);
  border-color: #D1D5DB;
}

.card-highlight {
  background: var(--color-bg-gray);
  border: 1px solid var(--color-border);
  padding: 40px;
}

.card-dark {
  background: var(--color-bg-dark);
  color: var(--color-text-white);
}
.card-dark h4 { color: var(--color-text-white); }
.card-dark p { color: var(--color-text-white-secondary); }

.card-dark-orange {
  background: var(--color-bg-dark-orange);
  color: var(--color-text-white);
}
.card-dark-orange h4 { color: var(--color-text-white); }
.card-dark-orange p { color: var(--color-text-white-secondary); }

.card-dark-green {
  background: var(--color-bg-dark-green);
  color: var(--color-text-white);
}
.card-dark-green h4 { color: var(--color-text-white); }
.card-dark-green p { color: var(--color-text-white-secondary); }

.card-light {
  background: var(--color-bg-gray);
  border: 1px solid var(--color-border);
}

.card-warm {
  background: var(--color-orange-light);
  border: 1px solid #FDBA74;
}

.card-blue-light {
  background: var(--color-blue-bg);
  border: 1px solid #93C5FD;
}

.card-dark-banner {
  background: var(--color-bg-dark);
  padding: 32px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 24px;
}

.card-dark-banner h4 { color: var(--color-text-white); }
.card-dark-banner p { color: var(--color-text-white-secondary); }

.card-h {
  flex-direction: row;
  align-items: flex-start;
}

.card-center {
  text-align: center;
  align-items: center;
  justify-content: center;
}

/* --- Card Elements --- */
.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.card-icon svg {
  width: 24px;
  height: 24px;
}

.card-icon-blue { background: var(--color-blue-bg); color: var(--color-blue); }
.card-icon-orange { background: rgba(249, 115, 22, 0.12); color: var(--color-orange); }
.card-icon-green { background: var(--color-green-light); color: var(--color-green-dark); }
.card-icon-purple { background: var(--color-purple-light); color: var(--color-purple); }

.card-dark .card-icon-blue { background: rgba(37, 99, 235, 0.25); color: #60A5FA; }
.card-dark .card-icon-orange { background: rgba(249, 115, 22, 0.25); color: #FB923C; }
.card-dark .card-icon-green { background: rgba(16, 185, 129, 0.25); color: #34D399; }

.card-dark-orange .card-icon-blue { background: rgba(37, 99, 235, 0.25); color: #60A5FA; }
.card-dark-orange .card-icon-orange { background: rgba(249, 115, 22, 0.3); color: #FED7AA; }
.card-dark-orange .card-icon-green { background: rgba(16, 185, 129, 0.25); color: #34D399; }

.card-dark-green .card-icon-blue { background: rgba(37, 99, 235, 0.25); color: #60A5FA; }
.card-dark-green .card-icon-orange { background: rgba(249, 115, 22, 0.25); color: #FB923C; }
.card-dark-green .card-icon-green { background: rgba(16, 185, 129, 0.3); color: #6EE7B7; }

.card-num {
  font-family: var(--font-number);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text-secondary);
}

.card-num-red { color: #EF4444; }
.card-num-green { color: var(--color-green); }

.card-value {
  font-family: var(--font-number);
  font-size: 36px;
  font-weight: 800;
}

.card-value-blue { color: var(--color-blue); }
.card-value-orange { color: var(--color-orange); }
.card-value-green { color: var(--color-green); }

.card-title {
  font-size: 22px;
  font-weight: 700;
}

.card-desc {
  color: var(--color-text-secondary);
  font-size: 15px;
  line-height: 1.7;
}

/* --- Dark List --- */
.dark-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.dark-list li {
  color: var(--color-text-white-secondary);
  font-size: 14px;
  padding-left: 16px;
  position: relative;
  line-height: 1.6;
}

.dark-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
}

/* --- Banner Tags --- */
.banner-tags {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.banner-tags span {
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: rgba(37, 99, 235, 0.2);
  color: #93C5FD;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.banner-stats {
  display: flex;
  gap: 32px;
}

.banner-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-size: 18px;
}

/* --- CTA Banner --- */
.cta-banner {
  background: linear-gradient(135deg, #2563EB 0%, #5B21B6 70%, #7C3AED 100%);
  border-radius: var(--radius-md);
  padding: 48px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  margin-top: 24px;
}

.cta-banner h3 {
  font-size: 28px;
  color: var(--color-text-white);
}

.cta-features {
  display: flex;
  gap: 32px;
}

.cta-feature {
  color: rgba(255, 255, 255, 0.9);
  font-size: 15px;
  font-weight: 500;
}

.cta-banner .btn-white {
  margin-top: 8px;
}

/* --- Footer --- */
.footer {
  background: linear-gradient(180deg, #0F172A 0%, #1A2942 100%);
  padding: 80px var(--section-px) 32px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-top {
  display: flex;
  gap: 64px;
  margin-bottom: 48px;
}

.footer-brand {
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-desc {
  color: var(--color-text-white-secondary);
  font-size: 15px;
  line-height: 1.7;
}

.footer-links {
  display: flex;
  gap: 48px;
  flex: 1;
  justify-content: flex-end;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col h5 {
  color: var(--color-text-white);
  font-size: 15px;
  margin-bottom: 4px;
}

.footer-col a {
  color: var(--color-text-white-secondary);
  font-size: 14px;
  transition: color 0.2s;
}
.footer-col a:hover {
  color: var(--color-text-white);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--color-text-white-secondary);
  font-size: 13px;
}

.footer .logo-text {
  color: var(--color-text-white);
}

/* --- Scroll Animation --- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* --- Responsive --- */
@media (max-width: 1024px) {
  :root {
    --section-px: 32px;
    --section-py: 72px;
  }

  .hero-title { font-size: 40px; }
  .section-title { font-size: 32px; }

  .cards-3 { grid-template-columns: 1fr 1fr; }
  .cards-4 { grid-template-columns: 1fr 1fr; }

  .footer-top { flex-direction: column; gap: 40px; }
  .footer-links { justify-content: flex-start; }
}

@media (max-width: 768px) {
  :root {
    --section-px: 20px;
    --section-py: 56px;
  }

  .nav { display: none; }

  .hero-title { font-size: 32px; }
  .hero-subtitle { font-size: 16px; }
  .section-title { font-size: 28px; }

  .hero-actions { flex-direction: column; width: 100%; }
  .hero-actions .btn { width: 100%; }
  .hero-stats { flex-direction: column; gap: 24px; }

  .cards-2, .cards-3, .cards-4 { grid-template-columns: 1fr; }

  .card-h { flex-direction: column; }

  .cta-features { flex-wrap: wrap; gap: 12px; justify-content: center; }

  .footer-links { flex-direction: column; gap: 24px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }

  .card-dark-banner { flex-direction: column; text-align: center; }
  .banner-stats { flex-wrap: wrap; justify-content: center; }
}

/* ========================================
   Global scrollbar styling
   ======================================== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--color-bg-gray); }
::-webkit-scrollbar-thumb { background: #CBD5E1; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #94A3B8; }