/* ===== 焕廷AI 官网 V7 — 高端奢华质感 ===== */

:root {
  --bg-deep: #0a0a0f;
  --bg-card: rgba(255,255,255,0.03);
  --bg-section: #0d0d14;
  --gold: #c9a84c;
  --gold-light: #e6cc7a;
  --gold-dark: #a88830;
  --text: #e8e6e0;
  --text-dim: #8a8a8a;
  --text-muted: #555;
  --border: rgba(201,168,76,0.15);
  --glass: rgba(255,255,255,0.04);
  --glass-border: rgba(255,255,255,0.06);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, 'PingFang SC', 'Noto Sans SC', 'Helvetica Neue', sans-serif;
  background: var(--bg-deep);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.gold { color: var(--gold); }

/* ===== 导航 ===== */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(10,10,15,0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: all 0.3s;
  box-shadow: 0 2px 20px rgba(0,0,0,0.5);
}

.navbar.scrolled {
  background: rgba(10,10,15,0.95);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 28px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-ring {
  display: flex;
  align-items: center;
  gap: 2px;
  font-size: 22px;
  letter-spacing: 2px;
  position: relative;
}

.logo-ring::after {
  content: 'AI';
  position: absolute;
  right: -28px;
  top: 0;
  font-size: 11px;
  color: var(--gold);
  letter-spacing: 0;
  opacity: 0;
  transition: opacity 0.3s;
}

.logo-text {
  font-weight: 700;
  color: #fff;
}

.logo-ai {
  font-weight: 300;
  color: var(--gold);
  font-size: 18px;
}

.nav-links {
  display: flex;
  gap: 36px;
}

.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.3s;
  position: relative;
  letter-spacing: 1px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--gold-light);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--gold);
  transition: width 0.3s;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 24px;
  cursor: pointer;
}

/* ===== Hero 大视觉 ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse at 15% 40%, rgba(201,168,76,0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 85% 35%, rgba(201,168,76,0.05) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 85%, rgba(10,10,20,0.9) 0%, transparent 60%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(201,168,76,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201,168,76,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at 50% 45%, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 45%, black 30%, transparent 70%);
}

.hero-content {
  text-align: center;
  z-index: 1;
  padding: 0 24px;
  max-width: 820px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 18px;
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--gold);
  margin-bottom: 32px;
  backdrop-filter: blur(10px);
  background: rgba(201,168,76,0.05);
  opacity: 0;
  animation: fadeDown 0.8s 0.2s forwards;
}

@keyframes fadeDown {
  from { opacity:0; transform:translateY(-16px); }
  to { opacity:1; transform:translateY(0); }
}

.hero-title {
  font-size: 72px;
  font-weight: 250;
  letter-spacing: 6px;
  margin-bottom: 24px;
  line-height: 1.12;
  opacity: 0;
  animation: fadeUp 0.8s 0.4s forwards;
}

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

.hero-title .gold {
  font-weight: 350;
}

.hero-sub {
  font-size: 17px;
  color: var(--text-dim);
  max-width: 580px;
  margin: 0 auto 44px;
  line-height: 1.9;
  opacity: 0;
  animation: fadeUp 0.8s 0.6s forwards;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.8s 0.8s forwards;
}

.btn-primary {
  display: inline-block;
  padding: 15px 40px;
  background: linear-gradient(135deg, var(--gold-dark), var(--gold), var(--gold-light));
  color: #0a0a0f;
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  border-radius: 4px;
  letter-spacing: 2px;
  transition: all 0.3s;
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 35px rgba(201,168,76,0.3);
}

.btn-outline {
  display: inline-block;
  padding: 15px 40px;
  border: 1px solid var(--gold);
  color: var(--gold-light);
  text-decoration: none;
  font-size: 14px;
  border-radius: 4px;
  letter-spacing: 2px;
  transition: all 0.3s;
}

.btn-outline:hover {
  background: rgba(201,168,76,0.1);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(201,168,76,0.1);
}

.hero-scroll {
  position: absolute;
  bottom: 32px;
  color: var(--text-dim);
  font-size: 12px;
  letter-spacing: 2px;
  animation: bounce 2s infinite;
  opacity: 0.5;
}

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

/* ===== 数字展板 ===== */
.stats-section {
  padding: 64px 0;
  background: rgba(201,168,76,0.02);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.stats-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item {}
.stat-number {
  font-size: 42px;
  font-weight: 200;
  color: var(--gold);
  letter-spacing: 2px;
  margin-bottom: 6px;
}
.stat-label {
  font-size: 13px;
  color: var(--text-dim);
  letter-spacing: 1px;
}

/* ===== Sections ===== */
.section {
  padding: 100px 0;
  position: relative;
}

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

.section-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-tag {
  display: inline-block;
  padding: 4px 16px;
  border: 1px solid var(--border);
  font-size: 11px;
  letter-spacing: 3px;
  color: var(--gold);
  margin-bottom: 20px;
}

.section-tag.gold-bg {
  background: rgba(201,168,76,0.08);
}

.section-title {
  font-size: 40px;
  font-weight: 300;
  letter-spacing: 2px;
  margin-bottom: 16px;
  line-height: 1.3;
}

.section-desc {
  font-size: 15px;
  color: var(--text-dim);
  max-width: 600px;
  margin-bottom: 50px;
  line-height: 1.8;
}

/* ===== Service Cards ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 60px;
}

.service-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  padding: 40px 30px;
  transition: all 0.4s;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: 0;
  transition: opacity 0.4s;
}

.service-card:hover::before {
  opacity: 1;
}

.service-card:hover {
  transform: translateY(-5px);
  background: rgba(255,255,255,0.06);
  border-color: rgba(201,168,76,0.3);
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.card-icon {
  font-size: 40px;
  margin-bottom: 20px;
}

.service-card h3 {
  font-size: 18px;
  font-weight: 500;
  margin-bottom: 12px;
  color: #fff;
}

.service-card p {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.7;
}

/* ===== Case ===== */
.case-showcase {
  margin-top: 20px;
}

.case-title {
  font-size: 16px;
  font-weight: 400;
  color: var(--text-dim);
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.case-videos {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.case-card {
  cursor: pointer;
  transition: transform 0.3s;
}

.case-card:hover {
  transform: translateY(-3px);
}

.case-thumb {
  aspect-ratio: 9/16;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  margin-bottom: 12px;
  position: relative;
  overflow: hidden;
}

.case-label {
  font-size: 14px;
  color: var(--gold);
  letter-spacing: 2px;
}

.case-name {
  font-size: 13px;
  color: var(--text-dim);
}

/* ===== Industry Grid ===== */
.industry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.industry-item {
  text-align: center;
  padding: 44px 24px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  transition: all 0.3s;
}

.industry-item:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(201,168,76,0.3);
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.3);
}

.industry-icon {
  font-size: 40px;
  margin-bottom: 16px;
}

.industry-item h4 {
  font-size: 16px;
  font-weight: 500;
  margin-bottom: 10px;
  color: #fff;
}

.industry-item p {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.6;
}

/* ===== News ===== */
.news-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.news-loading {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--text-dim);
  padding: 60px 0;
}

.news-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  padding: 28px;
  transition: all 0.3s;
}

.news-card:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(201,168,76,0.3);
  transform: translateY(-3px);
}

.news-date {
  font-size: 11px;
  color: var(--text-dim);
  margin-bottom: 10px;
  letter-spacing: 1px;
}

.news-title {
  font-size: 16px;
  font-weight: 500;
  margin-bottom: 10px;
  color: #fff;
}

.news-desc {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.6;
  margin-bottom: 16px;
}

.news-link {
  font-size: 12px;
  color: var(--gold);
  text-decoration: none;
  letter-spacing: 1px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.3s;
}

.news-link:hover {
  gap: 8px;
}

/* ===== About ===== */
.about-content {
  max-width: 700px;
}

.about-text p {
  font-size: 15px;
  color: var(--text-dim);
  margin-bottom: 16px;
  line-height: 1.9;
}

.about-slogan {
  font-size: 14px !important;
  color: var(--gold) !important;
  letter-spacing: 2px;
  font-style: italic;
  padding: 20px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin: 24px 0 !important;
}

.about-founders {
  margin-top: 32px;
}

.founder {
  display: flex;
  align-items: center;
  gap: 16px;
}

.founder-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gold-dark), var(--gold));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 600;
  color: #0a0a0f;
}

.founder-info h4 {
  font-size: 16px;
  font-weight: 500;
  color: #fff;
  margin-bottom: 3px;
}

.founder-info p {
  font-size: 13px !important;
  color: var(--text-dim) !important;
  margin-bottom: 0 !important;
}

/* ===== 引语大横幅 ===== */
.quote-section {
  padding: 80px 0;
  background: linear-gradient(135deg, rgba(201,168,76,0.04), rgba(10,10,15,0.5));
  text-align: center;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.quote-inner {
  max-width: 700px;
  margin: 0 auto;
  padding: 0 24px;
}

.quote-mark {
  font-size: 60px;
  font-family: Georgia, serif;
  color: var(--gold);
  opacity: 0.25;
  line-height: 0;
  vertical-align: -20px;
}

.quote-text {
  font-size: 24px;
  font-weight: 300;
  letter-spacing: 3px;
  color: rgba(255,255,255,0.55);
  line-height: 1.6;
}

.quote-author {
  margin-top: 20px;
  font-size: 13px;
  color: var(--text-dim);
  letter-spacing: 2px;
}

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 10px;
}

.contact-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  padding: 36px 24px;
  text-align: center;
  transition: all 0.3s;
}

.contact-card:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(201,168,76,0.3);
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}

.contact-icon {
  font-size: 28px;
  margin-bottom: 16px;
}

.contact-card h4 {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
  letter-spacing: 1px;
  font-weight: 400;
}

.contact-card p {
  font-size: 14px;
  color: var(--text);
}

/* ===== Footer ===== */
.footer {
  background: #07070b;
  border-top: 1px solid var(--border);
  padding: 60px 0 0;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-logo {
  font-size: 24px;
  font-weight: 300;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.7;
}

.footer-nav h4 {
  font-size: 14px;
  color: #fff;
  margin-bottom: 16px;
  font-weight: 500;
}

.footer-nav a {
  display: block;
  font-size: 13px;
  color: var(--text-dim);
  text-decoration: none;
  margin-bottom: 10px;
  transition: color 0.3s;
}

.footer-nav a:hover {
  color: var(--gold-light);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 24px;
  text-align: center;
  margin-top: 40px;
}

.footer-bottom p {
  font-size: 12px;
  color: var(--text-dim);
}

/* ===== 淡入动画 ===== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.fade-scale {
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero-title { font-size: 40px; letter-spacing: 3px; }
  .hero-sub { font-size: 14px; }
  .nav { display: none; }
  .menu-toggle { display: block; }
  
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px;
    left: 0;
    width: 100%;
    background: rgba(10,10,15,0.96);
    backdrop-filter: blur(20px);
    padding: 24px;
    gap: 18px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  }
  
  .section-title { font-size: 30px; }
  .card-grid { grid-template-columns: 1fr; }
  .industry-grid { grid-template-columns: repeat(2, 1fr); }
  .news-container { grid-template-columns: 1fr; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr; }
  .quote-text { font-size: 18px; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 32px; }
  .industry-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
}