/* ============================================
   未来智汇 - AI Agent 定制开发专家
   深色科技风主题样式
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  --bg-primary: #0a0e27;
  --bg-secondary: #0f1330;
  --bg-card: rgba(15, 19, 48, 0.7);
  --bg-footer: #050816;
  --gradient-start: #00d4ff;
  --gradient-end: #7c3aed;
  --accent-blue: #00d4ff;
  --accent-purple: #7c3aed;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --border-glow: rgba(0, 212, 255, 0.1);
  --border-glow-hover: rgba(0, 212, 255, 0.4);
  --nav-height: 72px;
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  margin: 0;
  padding: 0;
  font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color var(--transition-base);
}
a:hover {
  color: var(--accent-purple);
  text-decoration: none;
}

::selection {
  background: rgba(0, 212, 255, 0.3);
  color: #fff;
}

/* ---------- Section Spacing ---------- */
section {
  padding: 100px 0;
  position: relative;
}
section:nth-child(even) {
  background-color: var(--bg-secondary);
}
section:nth-child(odd) {
  background-color: var(--bg-primary);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 3.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Navbar ---------- */
.navbar {
  min-height: var(--nav-height);
  background: rgba(10, 14, 39, 0.6) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: background var(--transition-base), box-shadow var(--transition-base);
  padding: 0.5rem 0;
}
.navbar.scrolled {
  background: rgba(10, 14, 39, 0.95) !important;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

.navbar-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1.15;
  padding-top: 0.15rem;
  padding-bottom: 0.15rem;
  gap: 2px;
}
.navbar-brand .navbar-logo {
  height: 32px;
  width: auto;
  flex-shrink: 0;
}
.navbar-brand .brand-text-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1.15;
}
.brand-name {
  font-size: 1.1rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 1px;
}
.brand-slogan {
  font-size: 0.65rem;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
  font-weight: 400;
}

.navbar .nav-link {
  color: rgba(255, 255, 255, 0.75) !important;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.5rem 1rem !important;
  position: relative;
  transition: color var(--transition-base);
}
.navbar .nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  transition: width var(--transition-base), left var(--transition-base);
  border-radius: 1px;
}
.navbar .nav-link:hover,
.navbar .nav-link.active {
  color: #fff !important;
}
.navbar .nav-link:hover::after,
.navbar .nav-link.active::after {
  width: 60%;
  left: 20%;
}

.navbar-toggler {
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 0.4rem 0.6rem;
}
.navbar-toggler:focus {
  box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.25);
}

.btn-nav-cta {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff !important;
  border: none;
  border-radius: 50px;
  padding: 0.45rem 1.5rem !important;
  font-size: 0.85rem;
  font-weight: 600;
  margin-left: 0.75rem;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  white-space: nowrap;
}
.btn-nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(0, 212, 255, 0.35);
  color: #fff !important;
}

/* ---------- Hero Section ---------- */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding: 120px 0 80px;
  background: radial-gradient(ellipse at 20% 50%, rgba(0, 212, 255, 0.08) 0%, transparent 50%),
              radial-gradient(ellipse at 80% 50%, rgba(124, 58, 237, 0.08) 0%, transparent 50%),
              var(--bg-primary);
}

#particles-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

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

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, #fff 0%, var(--gradient-start) 50%, var(--gradient-end) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: heroTitleIn 1s ease-out;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  animation: heroSubIn 1s ease-out 0.2s both;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  animation: heroBtnIn 1s ease-out 0.4s both;
}

.btn-hero-primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
  border: none;
  border-radius: 50px;
  padding: 0.85rem 2.5rem;
  font-size: 1.05rem;
  font-weight: 600;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  display: inline-block;
}
.btn-hero-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 40px rgba(0, 212, 255, 0.4);
  color: #fff;
}

.btn-hero-secondary {
  background: transparent;
  color: var(--accent-blue);
  border: 1px solid var(--accent-blue);
  border-radius: 50px;
  padding: 0.85rem 2.5rem;
  font-size: 1.05rem;
  font-weight: 600;
  transition: all var(--transition-base);
  display: inline-block;
}
.btn-hero-secondary:hover {
  background: rgba(0, 212, 255, 0.1);
  transform: translateY(-3px);
  box-shadow: 0 10px 40px rgba(0, 212, 255, 0.15);
  color: var(--accent-blue);
}

.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  animation: scrollBounce 2s infinite;
  color: rgba(255, 255, 255, 0.4);
  font-size: 1.5rem;
}

@keyframes heroTitleIn {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes heroSubIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes heroBtnIn {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes scrollBounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-12px); }
  60% { transform: translateX(-50%) translateY(-6px); }
}

/* ---------- Capability Cards ---------- */
.capability-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: 16px;
  padding: 2.5rem 2rem;
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  height: 100%;
  backdrop-filter: blur(10px);
}
.capability-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-glow-hover);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.15), 0 20px 60px rgba(0, 0, 0, 0.3);
}

.capability-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(124, 58, 237, 0.15));
  border: 1px solid rgba(0, 212, 255, 0.2);
  font-size: 1.8rem;
  color: var(--accent-blue);
  transition: all var(--transition-base);
}
.capability-card:hover .capability-icon {
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.25), rgba(124, 58, 237, 0.25));
  box-shadow: 0 0 25px rgba(0, 212, 255, 0.3);
  transform: scale(1.05);
}

.capability-card h4 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: #fff;
}
.capability-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 0;
}

/* ---------- Solutions ---------- */
.solution-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  text-align: center;
  transition: all var(--transition-base);
  height: 100%;
  backdrop-filter: blur(10px);
}
.solution-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow-hover);
  box-shadow: 0 0 25px rgba(0, 212, 255, 0.12), 0 15px 50px rgba(0, 0, 0, 0.25);
}

.solution-icon {
  font-size: 2.5rem;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.solution-card h4 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: #fff;
}
.solution-card p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.7;
  margin-bottom: 1rem;
}
.solution-card .solution-link {
  color: var(--accent-blue);
  font-size: 0.88rem;
  font-weight: 600;
  transition: color var(--transition-base);
}
.solution-card .solution-link:hover {
  color: var(--accent-purple);
}

/* ---------- Stats / Counter ---------- */
.stats-section {
  background: radial-gradient(ellipse at center, rgba(0, 212, 255, 0.06) 0%, transparent 70%),
              var(--bg-secondary) !important;
}

.stat-card {
  text-align: center;
  padding: 2rem 1rem;
}
.stat-number {
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}
.stat-label {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ---------- Feature List (About) ---------- */
.feature-item {
  display: flex;
  gap: 1.25rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: 12px;
  transition: all var(--transition-base);
  height: 100%;
  backdrop-filter: blur(10px);
}
.feature-item:hover {
  border-color: var(--border-glow-hover);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.1);
}
.feature-icon {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(124, 58, 237, 0.15));
  font-size: 1.25rem;
  color: var(--accent-blue);
}
.feature-item h5 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: #fff;
}
.feature-item p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-bottom: 0;
  line-height: 1.7;
}

/* ---------- Case Cards ---------- */
.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  transition: all var(--transition-base);
  height: 100%;
  backdrop-filter: blur(10px);
}
.case-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow-hover);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.12), 0 15px 50px rgba(0, 0, 0, 0.25);
}

.case-tag {
  display: inline-block;
  padding: 0.25rem 0.85rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(124, 58, 237, 0.15));
  color: var(--accent-blue);
  border: 1px solid rgba(0, 212, 255, 0.2);
}

.case-card h4 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  color: #fff;
}
.case-card .case-desc {
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-bottom: 1.25rem;
  line-height: 1.6;
}

.case-metrics {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.case-metric {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.case-metric:last-child {
  border-bottom: none;
}
.case-metric-label {
  color: var(--text-secondary);
  font-size: 0.82rem;
}
.case-metric-value {
  font-weight: 700;
  font-size: 0.95rem;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- Contact Section ---------- */
.contact-section {
  background: radial-gradient(ellipse at 30% 50%, rgba(124, 58, 237, 0.06) 0%, transparent 50%),
              var(--bg-primary) !important;
}

.contact-info h3 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: #fff;
}
.contact-info-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.contact-info-item i {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.12), rgba(124, 58, 237, 0.12));
  color: var(--accent-blue);
  font-size: 1rem;
  flex-shrink: 0;
}
.contact-info-item span {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.contact-form-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: 16px;
  padding: 2.5rem;
  backdrop-filter: blur(10px);
}
.contact-form-wrap h4 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 1.75rem;
  color: #fff;
}

.form-control-dark {
  background: rgba(255, 255, 255, 0.04) !important;
  border: 1px solid rgba(255, 255, 255, 0.08) !important;
  border-radius: 10px !important;
  color: #fff !important;
  padding: 0.75rem 1rem !important;
  font-size: 0.92rem;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}
.form-control-dark::placeholder {
  color: rgba(255, 255, 255, 0.3);
}
.form-control-dark:focus {
  border-color: var(--accent-blue) !important;
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.12) !important;
  outline: none !important;
}

.btn-submit {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
  border: none;
  border-radius: 50px;
  padding: 0.8rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  width: 100%;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.35);
  color: #fff;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--bg-footer);
  padding: 60px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}
.footer-brand {
  font-size: 1.35rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.75rem;
}
.footer-desc {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.7;
}
.footer-title {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 1.25rem;
}
.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-links li {
  margin-bottom: 0.6rem;
}
.footer-links a {
  color: var(--text-secondary);
  font-size: 0.88rem;
  transition: color var(--transition-base);
}
.footer-links a:hover {
  color: var(--accent-blue);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 1.25rem 0;
  margin-top: 3rem;
  text-align: center;
}
.footer-bottom p {
  color: rgba(255, 255, 255, 0.35);
  font-size: 0.82rem;
  margin: 0;
}
.footer-bottom a {
  color: rgba(255, 255, 255, 0.35);
  margin-left: 1rem;
}
.footer-bottom a:hover {
  color: var(--accent-blue);
}

/* ---------- Scroll Animations ---------- */
.fade-in-up,
.fade-in-left,
.fade-in-right {
  opacity: 0;
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-in-up {
  transform: translateY(40px);
}
.fade-in-left {
  transform: translateX(-40px);
}
.fade-in-right {
  transform: translateX(40px);
}
.fade-in-up.visible,
.fade-in-left.visible,
.fade-in-right.visible {
  opacity: 1;
  transform: translate(0, 0);
}

/* stagger delays for children */
.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }
.stagger-5 { transition-delay: 0.5s; }
.stagger-6 { transition-delay: 0.6s; }

/* ---------- Staggered Card Layout ---------- */
@media (min-width: 992px) {
  .staggered-cards > div:nth-child(even) > .capability-card,
  .staggered-cards > div:nth-child(even) > .solution-card,
  .staggered-cards > div:nth-child(even) > .case-card {
    transform: translateY(-14px);
  }
  .staggered-cards > div:nth-child(odd) > .capability-card,
  .staggered-cards > div:nth-child(odd) > .solution-card,
  .staggered-cards > div:nth-child(odd) > .case-card {
    transform: translateY(14px);
  }
  .staggered-cards > div:nth-child(even) > .capability-card:hover,
  .staggered-cards > div:nth-child(even) > .solution-card:hover,
  .staggered-cards > div:nth-child(even) > .case-card:hover {
    transform: translateY(-14px) translateY(-8px);
  }
  .staggered-cards > div:nth-child(odd) > .capability-card:hover,
  .staggered-cards > div:nth-child(odd) > .solution-card:hover,
  .staggered-cards > div:nth-child(odd) > .case-card:hover {
    transform: translateY(14px) translateY(-6px);
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 991.98px) {
  .hero-title {
    font-size: 2.5rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .section-title {
    font-size: 2rem;
  }
  .stat-number {
    font-size: 2.5rem;
  }
  .navbar .nav-link {
    padding: 0.6rem 0 !important;
  }
  .navbar .nav-link::after {
    display: none;
  }
  .btn-nav-cta {
    margin-left: 0;
    margin-top: 0.5rem;
    display: inline-block;
    text-align: center;
  }
  .contact-form-wrap {
    margin-top: 2rem;
  }
}

@media (max-width: 767.98px) {
  section {
    padding: 70px 0;
  }
  .hero-title {
    font-size: 2rem;
  }
  .hero-subtitle {
    font-size: 0.95rem;
  }
  .section-title {
    font-size: 1.75rem;
  }
  .stat-number {
    font-size: 2rem;
  }
  .stat-card {
    padding: 1.25rem 0.5rem;
  }
  .capability-card {
    padding: 2rem 1.5rem;
  }
  .contact-form-wrap {
    padding: 1.75rem;
  }
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  .btn-hero-primary,
  .btn-hero-secondary {
    width: 80%;
    text-align: center;
  }
}

@media (max-width: 575.98px) {
  .hero-title {
    font-size: 1.65rem;
  }
  .section-title {
    font-size: 1.5rem;
  }
  .section-subtitle {
    font-size: 0.95rem;
  }
  .stat-number {
    font-size: 1.75rem;
  }
  .brand-name {
    font-size: 0.95rem;
  }
  .contact-info h3 {
    font-size: 1.35rem;
  }
}