/* ============================================
   武汉云灵科技有限公司 — 全局样式系统
   Design inspired by Stripe
   ============================================ */

/* --- CSS Variables --- */
:root {
  /* Primary Colors */
  --blue-deep: #0358C0;
  --blue-light: #B3DBFF;
  --blue-mid: #1976D2;
  --orange-deep: #C05A03;
  --orange-light: #FFD384;
  --orange-mid: #D06E01;

  /* Gradients */
  --gradient-blue: linear-gradient(135deg, #B3DBFF 0%, #0358C0 100%);
  --gradient-orange: linear-gradient(135deg, #C05A03 0%, #FFD384 100%);
  --gradient-mixed: linear-gradient(135deg, #0358C0 0%, #D06E01 100%);
  --gradient-hero: linear-gradient(170deg, #0A0F1E 0%, #0D1B3E 40%, #0A1628 100%);
  --gradient-cta: linear-gradient(135deg, #0358C0 0%, #1976D2 50%, #0D47A1 100%);

  /* Neutral */
  --bg-dark: #0A0F1E;
  --bg-dark-2: #111827;
  --bg-light: #FFFFFF;
  --bg-gray: #F7F8FA;
  --bg-gray-2: #EEF0F4;

  /* Text */
  --text-primary: #1A1A2E;
  --text-secondary: #4B5563;
  --text-muted: #9CA3AF;
  --text-light: #E5E7EB;
  --text-white: #FFFFFF;

  /* Borders */
  --border-light: #E5E7EB;
  --border-medium: #D1D5DB;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 40px -10px rgba(0,0,0,0.1), 0 12px 20px -12px rgba(0,0,0,0.06);
  --shadow-blue: 0 8px 30px rgba(3, 88, 192, 0.15);
  --shadow-orange: 0 8px 30px rgba(208, 110, 1, 0.15);

  /* Spacing */
  --container-max: 1200px;
  --section-padding: 100px 0;
  --section-padding-sm: 64px 0;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 0.2s;
  --duration-normal: 0.3s;
  --duration-slow: 0.5s;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  color: var(--text-primary);
  background: var(--bg-light);
  line-height: 1.6;
  overflow-x: hidden;
}

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

ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea { font-family: inherit; }

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

/* --- Section --- */
.section {
  padding: var(--section-padding);
}

.section-sm {
  padding: var(--section-padding-sm);
}

.section-dark {
  background: var(--bg-dark);
  color: var(--text-white);
}

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

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(2rem, 3.5vw, 3rem);
  letter-spacing: -0.02em;
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  letter-spacing: -0.01em;
}

.section-label {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--orange-mid);
  margin-bottom: 16px;
}

.section-label.light {
  color: var(--orange-light);
}

.section-title {
  margin-bottom: 20px;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

.section-dark .section-subtitle {
  color: var(--text-muted);
}

/* --- Gradient Text --- */
.gradient-text {
  background: var(--gradient-blue);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-warm {
  background: var(--gradient-orange);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--duration-normal) var(--ease-out);
  white-space: nowrap;
  letter-spacing: -0.01em;
}

.btn-primary {
  background: var(--blue-deep);
  color: var(--text-white);
  box-shadow: var(--shadow-blue);
}

.btn-primary:hover {
  background: var(--blue-mid);
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(3, 88, 192, 0.25);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-white);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.18);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  background: var(--blue-deep);
  color: var(--text-white);
}

.btn-outline-light {
  background: transparent;
  color: var(--text-white);
  border: 1.5px solid rgba(255, 255, 255, 0.25);
}

.btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-lg {
  padding: 18px 40px;
  font-size: 1.1rem;
  border-radius: var(--radius-lg);
}

.btn-arrow::after {
  content: '\2192';
  font-size: 1.2em;
  transition: transform var(--duration-fast) var(--ease-out);
}

.btn-arrow:hover::after {
  transform: translateX(4px);
}

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: all var(--duration-normal) var(--ease-out);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
  padding: 12px 0;
}

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

.navbar.scrolled .navbar-logo-text {
  color: var(--text-primary);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 32px;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 0;
}

.navbar-logo svg {
  height: 40px;
  width: auto;
  margin-right: -42px;
}

.navbar-logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-white);
  letter-spacing: -0.01em;
  transition: color var(--duration-normal);
}

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

.nav-link {
  font-size: 0.938rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.8);
  transition: all var(--duration-fast) var(--ease-out);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--orange-mid);
  border-radius: 1px;
  transition: width var(--duration-normal) var(--ease-out);
}

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

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

.navbar.scrolled .nav-link:hover {
  color: var(--blue-deep);
}

.nav-cta {
  padding: 10px 24px;
  font-size: 0.875rem;
}

/* --- Sub-page navbar: always has solid bg --- */
.navbar.subpage {
  background: var(--bg-dark);
  box-shadow: 0 1px 0 rgba(255,255,255,0.06);
}

.navbar.subpage .nav-link {
  color: rgba(255, 255, 255, 0.8);
}

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

.navbar.subpage .menu-toggle span {
  background: var(--text-white);
}

.navbar.subpage.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
  padding: 12px 0;
}

.navbar.subpage.scrolled .nav-link {
  color: var(--text-primary);
}

.navbar.subpage.scrolled .navbar-logo-text {
  color: var(--text-primary);
}

.navbar.subpage.scrolled .menu-toggle span {
  background: var(--text-primary);
}

.navbar.subpage.scrolled .nav-link:hover {
  color: var(--blue-deep);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-white);
  border-radius: 1px;
  transition: all var(--duration-normal) var(--ease-out);
}

.navbar.scrolled .menu-toggle span {
  background: var(--text-primary);
}

/* --- Section Header --- */
.section-header {
  text-align: center;
  margin-bottom: 64px;
}

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

/* --- Cards --- */
.card {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: all var(--duration-normal) var(--ease-out);
}

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

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  font-size: 1.5rem;
}

.card-icon.blue {
  background: linear-gradient(135deg, #EBF5FF, #D6EAFF);
}

.card-icon.orange {
  background: linear-gradient(135deg, #FFF7ED, #FFEDD5);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.card-desc {
  font-size: 0.938rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 20px;
  font-size: 0.938rem;
  font-weight: 600;
  color: var(--blue-deep);
  transition: gap var(--duration-fast);
}

.card-link:hover {
  gap: 10px;
}

/* --- Grid layouts --- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.grid-5 { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }

/* --- Footer --- */
.footer {
  background: var(--bg-dark);
  color: var(--text-light);
  padding: 80px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 32px;
}

.footer-brand-desc {
  color: var(--text-muted);
  font-size: 0.938rem;
  line-height: 1.7;
  margin-top: 16px;
}

.footer-col-title {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  margin-bottom: 20px;
  color: var(--text-white);
}

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

.footer-links a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color var(--duration-fast);
}

.footer-links a:hover {
  color: var(--text-white);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.813rem;
  color: var(--text-muted);
}

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

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

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

/* Fade from left */
.fade-in-left {
  opacity: 0;
  transform: translateX(-48px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

/* Fade from right */
.fade-in-right {
  opacity: 0;
  transform: translateX(48px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

.fade-in-left.visible,
.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* --- Utility --- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-48 { margin-top: 48px; }
.mt-64 { margin-top: 64px; }
.mb-16 { margin-bottom: 16px; }
.mb-32 { margin-bottom: 32px; }
.mb-48 { margin-bottom: 48px; }

/* --- Tag --- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 0.813rem;
  font-weight: 600;
}

.tag-blue {
  background: rgba(3, 88, 192, 0.08);
  color: var(--blue-deep);
}

.tag-orange {
  background: rgba(208, 110, 1, 0.08);
  color: var(--orange-mid);
}

/* --- Divider --- */
.divider {
  width: 48px;
  height: 4px;
  background: var(--gradient-mixed);
  border-radius: 2px;
  margin: 24px 0;
}

.section-header .divider {
  margin: 24px auto;
}

/* --- Page Hero (for inner pages) --- */
.page-hero {
  padding: 180px 0 80px;
  text-align: center;
  background: var(--gradient-hero);
  color: var(--text-white);
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(3,88,192,0.15) 0%, transparent 70%);
  border-radius: 50%;
}

.page-hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(208,110,1,0.1) 0%, transparent 70%);
  border-radius: 50%;
}

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

.page-hero h1 {
  margin-bottom: 20px;
}

.page-hero .section-subtitle {
  color: var(--text-muted);
  margin: 0 auto;
}

/* --- Breadcrumb --- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  justify-content: center;
}

.breadcrumb a {
  color: var(--text-muted);
  transition: color var(--duration-fast);
}

.breadcrumb a:hover {
  color: var(--text-white);
}

.breadcrumb .sep {
  color: rgba(255,255,255,0.3);
}

.breadcrumb .current {
  color: var(--orange-light);
}

/* --- Feature Cards (for product pages) --- */
.feature-card {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  border: 1px solid var(--border-light);
  transition: all var(--duration-normal) var(--ease-out);
  box-shadow: var(--shadow-sm);
}

.feature-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: var(--blue-light);
}

.feature-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.25rem;
}

.feature-card-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- Stat Numbers --- */
.stat-number {
  font-size: clamp(2.5rem, 4vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
}

/* --- Contact Form --- */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-input,
.form-textarea {
  padding: 14px 16px;
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-md);
  font-size: 0.938rem;
  transition: all var(--duration-fast);
  outline: none;
  background: var(--bg-light);
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--blue-deep);
  box-shadow: 0 0 0 3px rgba(3, 88, 192, 0.08);
}

.form-textarea {
  min-height: 140px;
  resize: vertical;
}

/* --- Page header stripe --- */
.page-stripe {
  height: 4px;
  background: var(--gradient-blue);
  width: 100%;
}

/* --- Two column layout --- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.two-col-wide {
  grid-template-columns: 1.1fr 0.9fr;
}

/* --- Stats Bar --- */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.stat-item {
  padding: 32px;
}

.stat-label {
  font-size: 0.938rem;
  color: var(--text-secondary);
  margin-top: 8px;
}

.section-dark .stat-label {
  color: var(--text-muted);
}

/* --- Logo Strip --- */
.logo-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 60px;
  flex-wrap: wrap;
}

.logo-strip-item {
  opacity: 0.4;
  filter: grayscale(1);
  transition: all var(--duration-normal);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-muted);
}

.logo-strip-item:hover {
  opacity: 1;
  filter: grayscale(0);
}

/* --- Page-specific background patterns --- */
.bg-dots {
  background-image: radial-gradient(rgba(3,88,192,0.08) 1px, transparent 1px);
  background-size: 32px 32px;
}

/* --- Process / Timeline --- */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: process;
}

.process-step {
  position: relative;
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  padding: 36px 28px 28px;
  border: 1px solid var(--border-light);
  counter-increment: process;
  transition: all var(--duration-normal) var(--ease-out);
}

.process-step:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.process-step::before {
  content: '0' counter(process);
  position: absolute;
  top: -16px;
  left: 28px;
  background: var(--gradient-blue);
  color: var(--text-white);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 100px;
}

.process-step h4 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.process-step p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- Highlight Box --- */
.highlight-box {
  background: linear-gradient(135deg, #EBF5FF, #F0F9FF);
  border-radius: var(--radius-lg);
  padding: 40px;
  border-left: 4px solid var(--blue-deep);
}

.highlight-box h3 {
  color: var(--blue-deep);
  margin-bottom: 12px;
}

.highlight-box p {
  color: var(--text-secondary);
  line-height: 1.8;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .container { padding: 0 24px; }
  .section { padding: 72px 0; }
  .navbar-inner { padding: 0 24px; }
  .grid-5 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .two-col { grid-template-columns: 1fr; gap: 48px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .section { padding: 56px 0; }
  .navbar-inner { padding: 0 20px; }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background: var(--bg-light);
    flex-direction: column;
    padding: 100px 32px 40px;
    gap: 24px;
    box-shadow: var(--shadow-xl);
    transition: right var(--duration-normal) var(--ease-out);
    z-index: 999;
  }

  .nav-menu.active {
    right: 0;
  }

  .nav-menu .nav-link {
    color: var(--text-primary);
    font-size: 1.125rem;
  }

  .menu-toggle { display: flex; z-index: 1000; }

  .grid-3, .grid-2, .grid-5 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .logo-strip { gap: 32px; }
  .page-hero { padding: 140px 0 60px; }
}

@media (max-width: 480px) {
  .stats-bar { grid-template-columns: 1fr; }
  .btn { padding: 12px 24px; font-size: 0.938rem; }
  .btn-lg { padding: 16px 32px; }
}