/* ==========================================================================
   拓拓数智官网样式 - style.css
   Modern, Clean, Responsive Tech Design
   ========================================================================== */

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --primary-gradient: linear-gradient(135deg, #2563eb 0%, #3b82f6 50%, #60a5fa 100%);
  --secondary: #0f172a;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --bg-page: #ffffff;
  --bg-card: #ffffff;
  --bg-alt: #f8fafc;
  --bg-dark: #0a0f1d;
  --border-color: #e2e8f0;
  --border-dark: #1e293b;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.07);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.08);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background-color: var(--bg-page);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
}

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

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #ffffff;
  box-shadow: 0 4px 14px 0 rgba(37, 99, 235, 0.35);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px 0 rgba(37, 99, 235, 0.45);
  background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 100%);
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.9rem;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.05rem;
  border-radius: 10px;
}

.btn-block {
  width: 100%;
}

/* 顶部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: var(--transition);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--primary-gradient);
  color: #fff;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--secondary);
}

.brand-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.desktop-nav a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
  position: relative;
}

.desktop-nav a:hover {
  color: var(--primary);
}

.desktop-nav a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 0;
  background: var(--primary);
  transition: var(--transition);
}

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

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}

.mobile-menu-toggle span {
  width: 100%;
  height: 2px;
  background-color: var(--text-main);
  border-radius: 2px;
  transition: var(--transition);
}

.mobile-drawer {
  display: none;
  flex-direction: column;
  padding: 16px 24px 24px;
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  gap: 16px;
}

.mobile-link {
  text-decoration: none;
  color: var(--text-main);
  font-size: 1.05rem;
  font-weight: 500;
  padding: 8px 0;
  border-bottom: 1px dashed #f1f5f9;
}

/* Hero Section */
.hero-section {
  position: relative;
  padding: 90px 0 80px;
  background: radial-gradient(circle at 50% 0%, #f0f7ff 0%, #ffffff 70%);
  overflow: hidden;
  text-align: center;
}

.hero-bg-glow {
  position: absolute;
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, rgba(255, 255, 255, 0) 70%);
  pointer-events: none;
}

.hero-grid-pattern {
  position: absolute;
  inset: 0;
  background-size: 40px 40px;
  background-image: 
    linear-gradient(to right, rgba(226, 232, 240, 0.4) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(226, 232, 240, 0.4) 1px, transparent 1px);
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 40%, transparent 75%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 24px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #2563eb;
  box-shadow: 0 0 8px #2563eb;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.gradient-text {
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #0284c7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.5rem;
  font-weight: 600;
  color: #334155;
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.8;
  max-width: 760px;
  margin: 0 auto 36px;
}

.hero-desc strong {
  color: var(--text-main);
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 60px;
}

/* Hero Stats */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding-top: 36px;
  border-top: 1px solid rgba(226, 232, 240, 0.8);
}

.stat-card {
  padding: 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-color);
}

.stat-num {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* 通用 Section */
.section {
  padding: 88px 0;
}

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

.section-dark {
  background-color: var(--bg-dark);
  color: #ffffff;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.12em;
  margin-bottom: 8px;
  text-transform: uppercase;
}

.section-dark .section-tag {
  color: #60a5fa;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
}

.section-dark .section-desc {
  color: #94a3b8;
}

/* 我们做什么 Services Grid */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: #cbd5e1;
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.card-icon svg {
  width: 26px;
  height: 26px;
}

.icon-blue { background: #eff6ff; color: #2563eb; }
.icon-emerald { background: #ecfdf5; color: #059669; }
.icon-amber { background: #fffbeb; color: #d97706; }
.icon-purple { background: #faf5ff; color: #7c3aed; }
.icon-cyan { background: #ecfeff; color: #0891b2; }

.card-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--secondary);
}

.card-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
}

.feature-list {
  list-style: none;
  border-top: 1px dashed var(--border-color);
  padding-top: 16px;
}

.feature-list li {
  position: relative;
  padding-left: 20px;
  font-size: 0.88rem;
  color: #475569;
  margin-bottom: 8px;
}

.feature-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: bold;
}

/* 核心解决方案 Solutions */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.solution-card {
  background: #131c31;
  border: 1px solid #1e293b;
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  transition: var(--transition);
  position: relative;
}

.solution-card:hover {
  border-color: #3b82f6;
  transform: translateY(-4px);
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.4);
}

.solution-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.3);
  color: #60a5fa;
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.solution-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: #1e293b;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #38bdf8;
  margin-bottom: 18px;
}

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

.solution-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: #f8fafc;
}

.solution-desc {
  font-size: 0.95rem;
  color: #94a3b8;
  line-height: 1.7;
  margin-bottom: 24px;
}

.solution-highlights {
  display: flex;
  flex-direction: column;
  gap: 12px;
  border-top: 1px solid #1e293b;
  padding-top: 20px;
}

.highlight-item {
  display: flex;
  flex-direction: column;
}

.highlight-item strong {
  font-size: 0.9rem;
  color: #e2e8f0;
}

.highlight-item span {
  font-size: 0.82rem;
  color: #64748b;
}

/* 精选案例 Cases */
.cases-wrapper {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.case-item {
  display: grid;
  grid-template-columns: 420px 1fr;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.case-item:hover {
  box-shadow: var(--shadow-xl);
  border-color: #cbd5e1;
}

.case-item-reverse {
  grid-template-columns: 1fr 420px;
}

.case-item-reverse .case-visual {
  order: 2;
}

.case-item-reverse .case-info {
  order: 1;
}

.case-visual {
  padding: 48px 36px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  color: #ffffff;
}

.visual-gradient-1 {
  background: linear-gradient(135deg, #065f46 0%, #047857 50%, #059669 100%);
}

.visual-gradient-2 {
  background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 50%, #2563eb 100%);
}

.case-badge {
  display: inline-block;
  align-self: flex-start;
  padding: 4px 12px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  backdrop-filter: blur(4px);
}

.case-tag-line {
  font-size: 1.8rem;
  font-weight: 800;
  margin: 30px 0;
  line-height: 1.3;
}

.case-mockup-icon {
  opacity: 0.7;
}

.case-info {
  padding: 44px 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.case-meta {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.case-name {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--secondary);
}

.case-text {
  font-size: 0.98rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.case-points {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.case-point {
  font-size: 0.9rem;
  color: #334155;
  line-height: 1.6;
}

.case-point strong {
  color: var(--secondary);
}

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

.case-tags span {
  padding: 5px 12px;
  background: #f1f5f9;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  color: #475569;
  font-weight: 500;
}

/* 为什么选择我们 Advantages */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
}

.adv-card {
  background: #ffffff;
  padding: 36px 30px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.adv-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: #e2e8f0;
  line-height: 1;
  margin-bottom: 16px;
}

.adv-card h4 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--secondary);
}

.adv-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 联系我们 Contact */
.contact-box {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  overflow: hidden;
}

.contact-details {
  padding: 48px;
}

.contact-details h3 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--secondary);
}

.contact-intro {
  font-size: 0.98rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 32px;
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-icon svg {
  width: 22px;
  height: 22px;
}

.contact-text {
  display: flex;
  flex-direction: column;
}

.contact-text .label {
  font-size: 0.8rem;
  color: var(--text-light);
  text-transform: uppercase;
  font-weight: 600;
}

.contact-text .val {
  font-size: 1.05rem;
  color: var(--secondary);
  font-weight: 600;
  margin-top: 2px;
}

.contact-card-extra {
  background: #f8fafc;
  border-left: 1px solid var(--border-color);
  padding: 48px 36px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.qr-box {
  width: 140px;
  height: 140px;
  background: #ffffff;
  border: 1px dashed var(--primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  box-shadow: var(--shadow-sm);
}

.qr-desc {
  font-size: 0.9rem;
  color: #475569;
  font-weight: 500;
}

.work-time {
  margin-top: 24px;
  padding: 8px 16px;
  background: #e2e8f0;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  color: #475569;
}

/* 页脚 Footer */
.site-footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 40px 0;
  border-top: 1px solid #1e293b;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-brand .brand-name {
  color: #ffffff;
  font-size: 1.15rem;
  font-weight: 700;
  margin-right: 12px;
}

.footer-brand .brand-tagline {
  font-size: 0.85rem;
  color: #64748b;
}

.footer-copy {
  font-size: 0.85rem;
  color: #64748b;
  margin-top: 6px;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-divider {
  color: #334155;
  font-size: 0.85rem;
}

/* 模态框 Modal */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 999;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.active {
  display: flex;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  animation: fadeIn 0.2s ease-out;
}

.modal-dialog {
  position: relative;
  background: #ffffff;
  border-radius: var(--radius-lg);
  max-width: 680px;
  width: 100%;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-xl);
  z-index: 1;
  animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--secondary);
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 1.8rem;
  line-height: 1;
  color: var(--text-light);
  cursor: pointer;
  transition: var(--transition);
}

.modal-close:hover {
  color: var(--text-main);
}

.modal-body {
  padding: 24px;
  overflow-y: auto;
  font-size: 0.95rem;
  color: #334155;
  line-height: 1.7;
}

.modal-lead {
  font-weight: 500;
  color: var(--secondary);
  margin-bottom: 16px;
}

.modal-body h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 18px 0 6px;
  color: var(--secondary);
}

.modal-body p {
  margin-bottom: 12px;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
}

/* 响应式适配 Responsive */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .case-item, .case-item-reverse {
    grid-template-columns: 1fr;
  }
  .case-item-reverse .case-visual {
    order: 0;
  }
  .case-item-reverse .case-info {
    order: 1;
  }
  .contact-box {
    grid-template-columns: 1fr;
  }
  .contact-card-extra {
    border-left: none;
    border-top: 1px solid var(--border-color);
  }
}

@media (max-width: 768px) {
  .desktop-nav, .header-action {
    display: none;
  }
  .mobile-menu-toggle {
    display: flex;
  }
  .mobile-drawer.active {
    display: flex;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .hero-subtitle {
    font-size: 1.2rem;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-actions {
    flex-direction: column;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .section {
    padding: 60px 0;
  }
  .section-title {
    font-size: 1.8rem;
  }
  .contact-details {
    padding: 28px 20px;
  }
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}