/* ===================================================
   QuickLink - 主样式文件
   科技感蓝色系网络加速服务官网
   =================================================== */

/* ---------- CSS 变量 ---------- */
:root {
  --primary: #1a6ef5;
  --primary-dark: #0d4cc8;
  --primary-light: #4f93ff;
  --accent: #00d4aa;
  --accent-dark: #00a87f;
  --bg-dark: #0a0f1e;
  --bg-card: #111827;
  --bg-card-hover: #1a2438;
  --border: rgba(255, 255, 255, 0.08);
  --border-active: rgba(26, 110, 245, 0.5);
  --text-primary: #f0f4ff;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --gradient-hero: linear-gradient(135deg, #0a0f1e 0%, #0d1b3e 50%, #091830 100%);
  --gradient-card: linear-gradient(145deg, #111827, #1a2438);
  --gradient-btn: linear-gradient(135deg, #1a6ef5, #4f93ff);
  --gradient-accent: linear-gradient(135deg, #00d4aa, #1a6ef5);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-btn: 0 4px 16px rgba(26, 110, 245, 0.4);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

ul, ol {
  list-style: none;
}

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

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
  background: var(--primary-dark);
  border-radius: 3px;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5 {
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  background: rgba(0, 212, 170, 0.1);
  border: 1px solid rgba(0, 212, 170, 0.25);
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  margin-bottom: 16px;
  background: linear-gradient(135deg, #f0f4ff 0%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 48px;
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 68px;
  display: flex;
  align-items: center;
  transition: background var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
  background: rgba(10, 15, 30, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--border);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
}

.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-btn);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.nav-logo span.brand {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  display: block;
  padding: 8px 16px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.07);
}

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

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

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  font-size: 0.93rem;
  font-weight: 600;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--gradient-btn);
  color: #fff;
  box-shadow: var(--shadow-btn);
}

.btn-primary:hover {
  box-shadow: 0 6px 24px rgba(26, 110, 245, 0.55);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--primary);
  background: rgba(26, 110, 245, 0.08);
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  box-shadow: 0 4px 16px rgba(0, 212, 170, 0.35);
}

.btn-accent:hover {
  box-shadow: 0 6px 24px rgba(0, 212, 170, 0.5);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 1rem;
  border-radius: 12px;
}

.btn-icon {
  padding: 10px 20px;
  font-size: 0.85rem;
}

/* ---------- Cards ---------- */
.card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

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

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
}

.card-icon.blue   { background: rgba(26, 110, 245, 0.15); }
.card-icon.green  { background: rgba(0, 212, 170, 0.15); }
.card-icon.purple { background: rgba(139, 92, 246, 0.15); }
.card-icon.orange { background: rgba(245, 158, 11, 0.15); }

.card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

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

.stat-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  transition: transform var(--transition), border-color var(--transition);
}

.stat-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-active);
}

.stat-number {
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 800;
  background: var(--gradient-btn);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* ---------- Feature Grid ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

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

/* ---------- Divider ---------- */
.divider {
  height: 1px;
  background: var(--border);
  margin: 0;
}

/* ---------- Badge ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 500;
  border: 1px solid;
}

.badge-success {
  color: var(--accent);
  background: rgba(0, 212, 170, 0.08);
  border-color: rgba(0, 212, 170, 0.2);
}

.badge-primary {
  color: var(--primary-light);
  background: rgba(26, 110, 245, 0.1);
  border-color: rgba(26, 110, 245, 0.25);
}

/* ---------- Platform Icons ---------- */
.platform-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.platform-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 20px 24px;
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  min-width: 100px;
}

.platform-item:hover {
  border-color: var(--primary);
  background: rgba(26, 110, 245, 0.08);
  transform: translateY(-2px);
}

.platform-item .p-icon {
  font-size: 2rem;
}

.platform-item span {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* ---------- Glow Effects ---------- */
.glow-blue {
  box-shadow: 0 0 40px rgba(26, 110, 245, 0.2);
}

.glow-accent {
  box-shadow: 0 0 40px rgba(0, 212, 170, 0.2);
}

/* ---------- Hero Background Grid ---------- */
.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(26, 110, 245, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26, 110, 245, 0.06) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black, transparent);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black, transparent);
}

/* ---------- Dot Glow ---------- */
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  pointer-events: none;
}

/* ---------- Page Hero (inner pages) ---------- */
.page-hero {
  padding: 140px 0 80px;
  text-align: center;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

.page-hero .container {
  position: relative;
  z-index: 1;
}

.page-hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 16px;
}

.page-hero p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 56px;
}

.footer-brand .nav-logo {
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 280px;
}

.footer-col h4 {
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 20px;
}

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

.footer-col ul a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.footer-col ul a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.footer-bottom p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.social-links {
  display: flex;
  gap: 12px;
}

.social-links a {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.social-links a:hover {
  background: rgba(26, 110, 245, 0.15);
  border-color: var(--primary);
  color: var(--primary-light);
}

/* ---------- Animations ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes pulse-ring {
  0% { box-shadow: 0 0 0 0 rgba(26, 110, 245, 0.4); }
  70% { box-shadow: 0 0 0 16px rgba(26, 110, 245, 0); }
  100% { box-shadow: 0 0 0 0 rgba(26, 110, 245, 0); }
}

.animate-fade-up {
  animation: fadeInUp 0.6s ease both;
}

.animate-float {
  animation: float 4s ease-in-out infinite;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

/* ---------- Scroll Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

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

/* ---------- Tag ---------- */
.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 600;
}

.tag-blue {
  background: rgba(26, 110, 245, 0.15);
  color: var(--primary-light);
}

.tag-green {
  background: rgba(0, 212, 170, 0.12);
  color: var(--accent);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .features-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }

  .footer-brand {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 72px 0;
  }

  .stats-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

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

  .nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: rgba(10, 15, 30, 0.97);
    backdrop-filter: blur(16px);
    flex-direction: column;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    gap: 4px;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 12px 16px;
    font-size: 1rem;
  }

  .nav-toggle {
    display: flex;
  }

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

  .footer-brand {
    grid-column: auto;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .btn-lg {
    padding: 12px 24px;
    font-size: 0.95rem;
  }

  .nav-actions .btn-outline {
    display: none;
  }
}