/* ===== 荆楚AI直播系统 · 全新配色网站 ===== */

/* CSS Variables */
:root {
  --charcoal:  #131b21;
  --charcoal-dark: #080810;
  --charcoal:  #131b21;
  --charcoal-dark: #080810;
  --blue: #36CFC9;
  --blue-dark: #2BB5B0;
  --orange:    #FF7D00;
  --teal:      #36CFC9;
  --purple:    #722ED1;
  --dark:      #1D2129;
  --gray-mid:  #4E5969;
  --gray-light:#F2F3F5;
  --white:     #FFFFFF;
  --shadow: rgba(0,0,0,0.08);
  --radius:    12px;
}

/* Reset */
* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--dark);
  background: var(--white);
  line-height: 1.7;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; }

/* ===== NAVBAR ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #E8E8E8;
}
.nav-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; height: 64px;
}
.nav-logo { display: flex; align-items: center; }
.nav-logo img { height: 42px; border-radius: 8px; }
.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a {
  font-size: 15px; color: var(--gray-mid); font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--blue); }
.nav-cta {
  background: var(--orange); color: #fff !important;
  padding: 8px 20px; border-radius: 8px; font-weight: 600 !important;
}
.nav-cta:hover { background: #e06d00; }

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  background: linear-gradient(135deg, #080810 0%, #131b21 50%, #080810 100%);
  display: flex; align-items: center; justify-content: center;
  text-align: center; color: #fff; padding: 80px 24px 60px;
  position: relative; overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero-badge {
  display: inline-block; background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  padding: 6px 18px; border-radius: 50px; font-size: 13px;
  margin-bottom: 24px; letter-spacing: 1px;
}
.hero h1 {
  font-size: clamp(36px, 6vw, 64px); font-weight: 800; line-height: 1.2;
  margin-bottom: 20px;
}
.hero h1 span { color: var(--orange); }
.hero-sub {
  font-size: clamp(16px, 2vw, 20px); opacity: 0.85;
  max-width: 640px; margin: 0 auto 40px; line-height: 1.8;
}
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  background: var(--orange); color: #fff;
  padding: 14px 36px; border-radius: 10px;
  font-size: 16px; font-weight: 700;
  border: none; cursor: pointer; transition: all 0.2s;
}
.btn-primary:hover { background: #e06d00; transform: translateY(-2px); }
.btn-outline {
  background: transparent; color: #fff;
  padding: 14px 36px; border-radius: 10px;
  font-size: 16px; font-weight: 600;
  border: 2px solid rgba(255,255,255,0.5);
  cursor: pointer; transition: all 0.2s;
}
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.1); }
.hero-stats {
  display: flex; gap: 48px; justify-content: center;
  margin-top: 64px; flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-num {
  font-size: 36px; font-weight: 800; color: var(--orange);
  font-family: 'Arial', sans-serif;
}
.stat-label { font-size: 14px; opacity: 0.75; margin-top: 4px; }

/* ===== SECTIONS ===== */
.section { padding: 80px 24px; }
.section-blue { background: var(--gray-light); }
.section-white { background: var(--white); }
.container { max-width: 1200px; margin: 0 auto; }
.section-tag {
  display: inline-block; font-size: 13px; font-weight: 600;
  color: var(--blue); background: rgba(255,125,0,0.08);
  padding: 4px 14px; border-radius: 50px; margin-bottom: 12px;
  letter-spacing: 1px;
}
.section-title {
  font-size: clamp(28px, 4vw, 40px); font-weight: 800;
  color: var(--dark); margin-bottom: 16px; line-height: 1.3;
}
.section-sub {
  font-size: 16px; color: var(--gray-mid); max-width: 600px;
  margin: 0 auto 48px; line-height: 1.8;
}

/* ===== FEATURE GRID ===== */
.feature-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--white); border-radius: var(--radius);
  padding: 32px; box-shadow: 0 2px 12px var(--shadow);
  border: 1px solid #F0F0F0; transition: all 0.3s;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(255,125,0,0.15);
}
.feature-icon {
  width: 52px; height: 52px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin-bottom: 16px;
}
.fi-blue   { background: rgba(255,125,0,0.1); color: var(--blue); }
.fi-teal   { background: rgba(54,207,201,0.1); color: var(--teal); }
.fi-purple { background: rgba(114,46,209,0.1); color: var(--purple); }
.fi-orange { background: rgba(255,125,0,0.1); color: var(--orange); }
.feature-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.feature-card p  { font-size: 14px; color: var(--gray-mid); line-height: 1.7; }

/* ===== PRODUCT ===== */
.product-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px;
  align-items: center;
}
.product-img {
  border-radius: var(--radius); background: linear-gradient(135deg, var(--charcoal-dark), var(--charcoal));
  aspect-ratio: 4/3; display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.product-img-inner {
  text-align: center; color: #fff; padding: 32px;
}
.product-img-inner h3 { font-size: 24px; margin-bottom: 8px; }
.product-img-inner p  { font-size: 14px; opacity: 0.8; }
.product-img-inner .big-num { font-size: 48px; font-weight: 800; color: var(--orange); }
.product-list { list-style: none; margin: 0; padding: 0; }
.product-list li {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 12px 0; border-bottom: 1px solid #F0F3F8;
  font-size: 15px;
}
.product-list li:last-child { border: none; }
.check-icon {
  width: 22px; height: 22px; border-radius: 50%;
  background: rgba(255,125,0,0.1); color: var(--blue);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; flex-shrink: 0; margin-top: 2px;
}

/* ===== PRICING ===== */
.pricing-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.pricing-card {
  background: var(--white); border-radius: var(--radius);
  padding: 36px 28px; text-align: center;
  border: 2px solid #F0F0F0; transition: all 0.3s;
  position: relative;
}
.pricing-card.popular {
  border-color: var(--teal); transform: scale(1.04);
  box-shadow: 0 8px 40px rgba(255,125,0,0.2);
}
.pricing-card.popular::before {
  content: '热门选择'; position: absolute; top: -14px; left: 50%;
  transform: translateX(-50%); background: var(--blue); color: #fff;
  font-size: 12px; font-weight: 700; padding: 4px 16px; border-radius: 50px;
}
.pricing-name { font-size: 18px; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.pricing-price { font-size: 40px; font-weight: 800; color: var(--orange); margin-bottom: 4px; }
.pricing-price span { font-size: 16px; font-weight: 400; color: var(--gray-mid); }
.pricing-desc { font-size: 13px; color: var(--gray-mid); margin-bottom: 24px; }
.pricing-features { list-style: none; text-align: left; margin-bottom: 28px; }
.pricing-features li {
  font-size: 14px; padding: 8px 0; color: var(--dark);
  display: flex; align-items: center; gap: 8px;
}
.pricing-features li::before {
  content: '✓'; color: var(--teal); font-weight: 700;
}
.pricing-btn {
  display: block; width: 100%; padding: 13px;
  border-radius: 10px; font-size: 15px; font-weight: 700;
  text-align: center; cursor: pointer; transition: all 0.2s;
  border: 2px solid var(--blue); color: var(--blue); background: transparent;
}
.pricing-btn:hover { background: var(--blue); color: #fff; }
.pricing-card.popular .pricing-btn {
  background: var(--orange); color: #fff; border-color: var(--orange);
}
.pricing-card.popular .pricing-btn:hover { background: #e06d00; }

/* ===== CASES ===== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.case-card {
  background: var(--white); border-radius: var(--radius);
  overflow: hidden; box-shadow: 0 2px 12px var(--shadow);
  border: 1px solid #F0F0F0;
  width: 100%;
}
.case-video-wrap {
  background: #000; aspect-ratio: 9/16;
  display: flex; align-items: center; justify-content: center;
  position: relative; cursor: pointer;
  max-height: 70vh;
}
.case-video-wrap video { width: 100%; height: 100%; object-fit: cover; }
.case-info { padding: 20px; }
.case-tag {
  display: inline-block; font-size: 12px; font-weight: 600;
  color: var(--blue); background: rgba(255,125,0,0.08);
  padding: 2px 10px; border-radius: 50px; margin-bottom: 8px;
}
.case-info h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.case-info p  { font-size: 13px; color: var(--gray-mid); line-height: 1.6; }
.case-stats {
  display: flex; gap: 16px; margin-top: 12px; flex-wrap: wrap;
}
.case-stat {
  font-size: 13px; color: var(--dark); font-weight: 600;
}
.case-stat span { color: var(--orange); }

/* ===== TRAINING ===== */
.training-section { background: linear-gradient(135deg, #F5F5F5 0%, #F5F5F5 100%); }
.training-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px;
  align-items: center;
}
.training-content h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 800; color: var(--dark); margin-bottom: 16px; }
.training-content h2 span { color: var(--orange); }
.training-content p { font-size: 16px; color: var(--gray-mid); margin-bottom: 32px; line-height: 1.8; }
.training-steps { list-style: none; }
.training-steps li {
  display: flex; align-items: flex-start; gap: 16px;
  margin-bottom: 20px;
}
.step-num {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--orange); color: #fff;
  font-size: 16px; font-weight: 800;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.step-text h4 { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.step-text p  { font-size: 13px; color: var(--gray-mid); }
.training-highlights {
  background: var(--white); border-radius: var(--radius);
  padding: 32px; box-shadow: 0 4px 20px rgba(255,125,0,0.1);
}
.highlight-title { font-size: 16px; font-weight: 700; margin-bottom: 20px; color: var(--dark); }
.highlight-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.highlight-item {
  background: var(--gray-light); border-radius: 10px;
  padding: 16px; text-align: center;
}
.highlight-item .num { font-size: 24px; font-weight: 800; color: var(--orange); }
.highlight-item .label { font-size: 12px; color: var(--gray-mid); margin-top: 4px; }

/* ===== ABOUT ===== */
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.about-text h2 { font-size: clamp(26px, 3.5vw, 36px); font-weight: 800; margin-bottom: 16px; }
.about-text p { font-size: 15px; color: var(--gray-mid); line-height: 1.8; margin-bottom: 12px; }
.about-values { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 32px; }
.value-item {
  background: var(--gray-light); border-radius: 10px;
  padding: 20px;
}
.value-item h4 { font-size: 15px; font-weight: 700; margin-bottom: 6px; color: var(--blue); }
.value-item p { font-size: 13px; color: var(--gray-mid); }
.about-img {
  background: linear-gradient(135deg, var(--charcoal-dark), var(--charcoal));
  border-radius: var(--radius); aspect-ratio: 4/3;
  display: flex; align-items: center; justify-content: center;
  color: #fff; text-align: center; padding: 32px;
}
.about-img h3 { font-size: 28px; margin-bottom: 8px; }
.about-img p { opacity: 0.8; }

/* ===== CONTACT ===== */
.contact-section { background: linear-gradient(135deg, var(--charcoal-dark), var(--charcoal)); color: #fff; }
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px;
}
.contact-info h2 { font-size: 32px; font-weight: 800; margin-bottom: 16px; }
.contact-info p { font-size: 16px; opacity: 0.85; margin-bottom: 32px; line-height: 1.8; }
.contact-item {
  display: flex; align-items: center; gap: 16px;
  margin-bottom: 20px; font-size: 16px;
}
.contact-icon {
  width: 44px; height: 44px; border-radius: 10px;
  background: rgba(255,255,255,0.15);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; flex-shrink: 0;
}
.contact-phone {
  font-size: 28px; font-weight: 800; color: var(--orange);
  letter-spacing: 2px;
}
.contact-form {
  background: var(--white); border-radius: var(--radius);
  padding: 36px; color: var(--dark);
}
.form-title { font-size: 20px; font-weight: 700; margin-bottom: 24px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--gray-mid); }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 11px 14px; border-radius: 8px;
  border: 1.5px solid #E5E8ED; font-size: 14px;
  font-family: inherit; transition: border 0.2s;
  outline: none;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--blue); }
.form-group textarea { resize: vertical; height: 100px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-submit {
  width: 100%; padding: 14px; border-radius: 10px;
  background: var(--orange); color: #fff;
  font-size: 16px; font-weight: 700; border: none; cursor: pointer;
  transition: all 0.2s;
}
.form-submit:hover { background: #e06d00; transform: translateY(-1px); }

/* ===== CTA BANNER ===== */
.cta-banner {
  background: var(--gray-light); text-align: center; padding: 80px 24px;
}
.cta-banner h2 { font-size: clamp(26px, 4vw, 38px); font-weight: 800; margin-bottom: 16px; }
.cta-banner p { font-size: 16px; color: var(--gray-mid); margin-bottom: 32px; }

/* ===== FOOTER ===== */
.footer {
  background: var(--dark); color: rgba(255,255,255,0.6);
  padding: 48px 24px 24px; font-size: 14px;
}
.footer-inner { max-width: 1200px; margin: 0 auto; }
.footer-top {
  display: flex; justify-content: space-between; align-items: center;
  padding-bottom: 24px; border-bottom: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 24px;
}
.footer-logo { font-size: 20px; font-weight: 800; color: #fff; }
.footer-links { display: flex; gap: 32px; }
.footer-links a { color: rgba(255,255,255,0.6); transition: color 0.2s; }
.footer-links a:hover { color: var(--orange); }
.footer-bottom { text-align: center; opacity: 0.5; }

/* ===== DOWNLOAD PAGE ===== */
.download-section { text-align: center; padding: 80px 24px; }
.download-card {
  max-width: 600px; margin: 0 auto;
  background: var(--white); border-radius: var(--radius);
  padding: 48px; box-shadow: 0 4px 24px var(--shadow);
  border: 1px solid #F0F0F0;
}
.download-icon { font-size: 64px; margin-bottom: 24px; }
.download-title { font-size: 26px; font-weight: 800; margin-bottom: 8px; }
.download-sub { font-size: 14px; color: var(--gray-mid); margin-bottom: 32px; }
.download-btn {
  display: inline-block; background: var(--blue); color: #fff;
  padding: 16px 48px; border-radius: 10px; font-size: 18px; font-weight: 700;
  transition: all 0.2s; margin-bottom: 16px;
}
.download-btn:hover { background: var(--blue-dark); transform: translateY(-2px); }
.download-note { font-size: 12px; color: var(--gray-mid); }

/* ===== PAGE HEADER ===== */
.page-header {
  background: linear-gradient(135deg, var(--charcoal-dark), var(--charcoal));
  color: #fff; text-align: center; padding: 120px 24px 60px;
}
.page-header h1 { font-size: clamp(32px, 5vw, 48px); font-weight: 800; margin-bottom: 12px; }
.page-header p  { font-size: 18px; opacity: 0.8; }

/* ===== MOBILE ===== */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero-stats { gap: 24px; }
  .product-grid, .training-grid, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .pricing-card.popular { transform: none; }
  .form-row { grid-template-columns: 1fr; }
  .highlight-grid { grid-template-columns: 1fr; }
  .footer-top { flex-direction: column; gap: 16px; }
  .footer-links { flex-wrap: wrap; justify-content: center; gap: 16px; }
}

/* ===== ANIMATIONS ===== */
.fade-up { opacity: 0; transform: translateY(20px); transition: all 0.6s ease; }
.fade-up.visible { opacity: 1; transform: none; }