/* ===== RESET & BASE ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --primary: #1a3a6b;
  --primary-light: #2563b0;
  --accent: #c9a84c;
  --accent-light: #e8c96a;
  --dark: #0d1b2a;
  --dark2: #1b2d45;
  --text: #2c3e50;
  --text-light: #7f8c8d;
  --bg: #ffffff;
  --bg2: #f4f7fb;
  --bg3: #eef2f7;
  --border: #dde3ec;
  --shadow: 0 4px 24px rgba(26,58,107,0.08);
  --shadow-lg: 0 8px 40px rgba(26,58,107,0.15);
  --radius: 12px;
  --radius-sm: 6px;
  --transition: 0.3s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  overflow-x: hidden;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

a { text-decoration: none; color: inherit; transition: var(--transition); }
ul { list-style: none; }
img { max-width: 100%; }

/* ===== HEADER / NAVBAR ===== */
#navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(13,27,42,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(201,168,76,0.2);
  transition: var(--transition);
}

.nav-container {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}

.logo { display: flex; align-items: center; gap: 12px; }
.logo-icon {
  font-size: 28px; color: var(--accent);
  background: rgba(201,168,76,0.1);
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%; border: 1px solid rgba(201,168,76,0.3);
}
.logo-text { display: flex; flex-direction: column; }
.logo-cn { font-size: 16px; font-weight: 700; color: #fff; letter-spacing: 2px; }
.logo-en { font-size: 9px; color: rgba(255,255,255,0.4); letter-spacing: 1px; }

#navbar nav ul { display: flex; gap: 8px; }
#navbar nav ul li a {
  color: rgba(255,255,255,0.75); font-size: 14px; font-weight: 500;
  padding: 8px 16px; border-radius: var(--radius-sm);
  position: relative; letter-spacing: 0.5px;
}
#navbar nav ul li a::after {
  content: ''; position: absolute; bottom: 2px; left: 50%; right: 50%;
  height: 2px; background: var(--accent);
  transition: var(--transition);
}
#navbar nav ul li a:hover { color: #fff; }
#navbar nav ul li a:hover::after { left: 16px; right: 16px; }

.nav-phone {
  display: flex; align-items: center; gap: 8px;
  color: var(--accent); font-weight: 600; font-size: 15px;
  background: rgba(201,168,76,0.1);
  padding: 8px 16px; border-radius: 30px;
  border: 1px solid rgba(201,168,76,0.3);
}
.nav-phone i { font-size: 13px; }

/* ===== HERO ===== */
.hero {
  position: relative; min-height: 100vh;
  background: linear-gradient(135deg, #0d1b2a 0%, #1a3a6b 50%, #0d3d6e 100%);
  display: flex; align-items: center; justify-content: center;
  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='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero-overlay {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 70% 50%, rgba(37,99,176,0.3) 0%, transparent 60%);
}

.hero-content {
  position: relative; z-index: 2; text-align: center;
  max-width: 860px; padding: 0 24px;
}
.hero-badge {
  display: inline-block;
  background: rgba(201,168,76,0.15);
  border: 1px solid rgba(201,168,76,0.4);
  color: var(--accent-light);
  font-size: 13px; font-weight: 500; letter-spacing: 3px;
  padding: 6px 20px; border-radius: 30px;
  margin-bottom: 28px; text-transform: uppercase;
}
.hero-content h1 {
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(32px, 5vw, 58px);
  font-weight: 700; color: #fff; line-height: 1.2;
  margin-bottom: 20px; letter-spacing: 4px;
}
.hero-sub {
  font-size: 18px; color: rgba(255,255,255,0.65);
  margin-bottom: 48px; letter-spacing: 2px;
}
.hero-stats {
  display: flex; align-items: center; justify-content: center;
  gap: 40px; margin-bottom: 48px;
}
.stat-item { text-align: center; }
.stat-num {
  display: block; font-size: 36px; font-weight: 700;
  color: var(--accent); line-height: 1;
}
.stat-label {
  display: block; font-size: 13px; color: rgba(255,255,255,0.5);
  margin-top: 6px; letter-spacing: 1px;
}
.stat-divider {
  width: 1px; height: 40px; background: rgba(255,255,255,0.15);
}
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #b8943f);
  color: #fff; font-weight: 600; font-size: 15px;
  padding: 14px 36px; border-radius: 30px;
  letter-spacing: 1px; border: none; cursor: pointer;
  transition: var(--transition); box-shadow: 0 4px 20px rgba(201,168,76,0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(201,168,76,0.5);
}
.btn-outline {
  background: transparent; color: #fff; font-weight: 500; font-size: 15px;
  padding: 14px 36px; border-radius: 30px;
  letter-spacing: 1px; border: 1.5px solid rgba(255,255,255,0.35);
  transition: var(--transition);
}
.btn-outline:hover {
  border-color: var(--accent); color: var(--accent-light);
  background: rgba(201,168,76,0.1);
}
.hero-scroll {
  position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%);
  color: rgba(255,255,255,0.3); font-size: 20px;
  animation: bounce 2s infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ===== SECTION HEADER ===== */
.section-header {
  text-align: center; margin-bottom: 60px;
}
.section-tag {
  display: inline-block;
  font-size: 12px; font-weight: 700; letter-spacing: 4px;
  color: var(--accent); text-transform: uppercase;
  margin-bottom: 12px;
}
.section-header h2 {
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(26px, 3vw, 36px); font-weight: 700;
  color: var(--dark); margin-bottom: 16px;
}
.section-line {
  width: 60px; height: 3px; background: var(--accent);
  margin: 0 auto 16px; border-radius: 2px;
}
.section-header.light h2 { color: #fff; }
.section-header.light .section-tag { color: var(--accent-light); }
.section-desc { color: rgba(255,255,255,0.6); font-size: 16px; margin-top: 8px; }

/* ===== ABOUT ===== */
.about { padding: 100px 0; background: var(--bg); }
.about-grid {
  display: grid; grid-template-columns: 420px 1fr; gap: 80px;
  align-items: center;
}
.about-img { position: relative; }
.about-img-inner {
  width: 100%; aspect-ratio: 4/3;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: var(--radius); display: flex;
  align-items: center; justify-content: center;
  font-size: 80px; color: rgba(255,255,255,0.15);
  position: relative; overflow: hidden;
}
.about-img-inner::before {
  content: ''; position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='80' height='80' viewBox='0 0 80 80' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M50 50c0-5.52 4.48-10 10-10s10 4.48 10 10-4.48 10-10 10c0 5.52-4.48 10-10 10s-10-4.48-10-10 4.48-10 10-10zM10 10c0-5.52 4.48-10 10-10s10 4.48 10 10-4.48 10-10 10c0 5.52-4.48 10-10 10S0 25.52 0 20s4.48-10 10-10z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.about-badge-box {
  position: absolute; bottom: -20px; right: -20px;
  background: var(--accent); color: #fff; text-align: center;
  padding: 16px 24px; border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}
.about-badge-num { display: block; font-size: 32px; font-weight: 700; line-height: 1; }
.about-badge-text { font-size: 12px; letter-spacing: 1px; opacity: 0.9; }
.about-content h3 {
  font-size: 22px; font-weight: 600; color: var(--dark);
  margin-bottom: 20px; line-height: 1.4;
}
.about-content p {
  color: var(--text-light); margin-bottom: 16px;
  font-size: 15px; line-height: 1.8;
}
.about-tags {
  display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px;
}
.about-tags span {
  display: flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 500; color: var(--primary);
  background: var(--bg3); padding: 6px 14px; border-radius: 20px;
}
.about-tags span i { color: var(--accent); }

/* ===== SERVICES ===== */
.services { padding: 100px 0; background: var(--bg2); }
.services-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.service-card {
  background: #fff; border-radius: var(--radius);
  padding: 36px 28px; border: 1px solid var(--border);
  transition: var(--transition); position: relative;
  overflow: hidden;
}
.service-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 3px; background: var(--accent);
  transform: scaleX(0); transform-origin: left;
  transition: var(--transition);
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.service-card:hover::before { transform: scaleX(1); }
.service-icon {
  width: 60px; height: 60px; border-radius: 12px;
  background: linear-gradient(135deg, rgba(26,58,107,0.08), rgba(37,99,176,0.12));
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
}
.service-icon i { font-size: 26px; color: var(--primary); }
.service-card h3 { font-size: 18px; font-weight: 600; color: var(--dark); margin-bottom: 12px; }
.service-card p { font-size: 14px; color: var(--text-light); line-height: 1.7; }

/* ===== ADVANTAGES ===== */
.advantages { padding: 100px 0; background: #fff; }
.adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; }
.adv-item {
  display: flex; gap: 20px; padding: 32px;
  border: 1px solid var(--border); margin: -1px 0 0 -1px;
  transition: var(--transition);
}
.adv-item:hover { background: var(--bg2); }
.adv-num {
  font-size: 36px; font-weight: 700; color: rgba(26,58,107,0.1);
  line-height: 1; flex-shrink: 0; min-width: 50px;
  transition: var(--transition);
}
.adv-item:hover .adv-num { color: var(--accent); }
.adv-content h3 { font-size: 16px; font-weight: 600; color: var(--dark); margin-bottom: 8px; }
.adv-content p { font-size: 14px; color: var(--text-light); line-height: 1.7; }

/* ===== CONTACT ===== */
.contact { padding: 100px 0; background: var(--dark); }
.contact-grid {
  display: grid; grid-template-columns: 1fr 1.2fr; gap: 60px;
}
.contact-info { display: flex; flex-direction: column; gap: 28px; }
.contact-item { display: flex; gap: 20px; align-items: flex-start; }
.contact-icon {
  width: 50px; height: 50px; flex-shrink: 0;
  background: rgba(201,168,76,0.1); border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid rgba(201,168,76,0.2);
}
.contact-icon i { font-size: 20px; color: var(--accent); }
.contact-item h4 { font-size: 14px; font-weight: 600; color: #fff; margin-bottom: 4px; }
.contact-item p { font-size: 14px; color: rgba(255,255,255,0.55); line-height: 1.6; }

.contact-form {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius); padding: 40px;
}
.contact-form h3 { font-size: 20px; font-weight: 600; color: #fff; margin-bottom: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact-form input,
.contact-form textarea {
  width: 100%; background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-sm); padding: 14px 18px;
  color: #fff; font-size: 14px; font-family: inherit;
  margin-bottom: 16px; transition: var(--transition);
  outline: none;
}
.contact-form input::placeholder,
.contact-form textarea::placeholder { color: rgba(255,255,255,0.3); }
.contact-form input:focus,
.contact-form textarea:focus { border-color: var(--accent); background: rgba(255,255,255,0.08); }
.contact-form textarea { resize: vertical; min-height: 100px; }
.btn-submit {
  width: 100%; background: linear-gradient(135deg, var(--accent), #b8943f);
  color: #fff; font-weight: 600; font-size: 15px;
  padding: 16px; border-radius: var(--radius-sm);
  border: none; cursor: pointer; letter-spacing: 1px;
  transition: var(--transition); display: flex;
  align-items: center; justify-content: center; gap: 8px;
}
.btn-submit:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(201,168,76,0.4); }

/* ===== FOOTER ===== */
.footer {
  background: #07111e; padding: 60px 0 0;
  border-top: 1px solid rgba(201,168,76,0.15);
}
.footer-grid {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 40px;
  margin-bottom: 40px;
}
.footer-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 16px; font-weight: 700; color: #fff;
  margin-bottom: 16px;
}
.footer-logo i { font-size: 22px; color: var(--accent); }
.footer-brand p { font-size: 14px; color: rgba(255,255,255,0.4); line-height: 1.7; }
.footer-links h4, .footer-services h4, .footer-contact h4 {
  font-size: 14px; font-weight: 600; color: #fff; margin-bottom: 16px;
}
.footer-links ul li,
.footer-services ul li { margin-bottom: 10px; }
.footer-links ul li a { font-size: 14px; color: rgba(255,255,255,0.4); }
.footer-links ul li a:hover { color: var(--accent); }
.footer-services ul li { font-size: 14px; color: rgba(255,255,255,0.4); }
.footer-contact p {
  font-size: 14px; color: rgba(255,255,255,0.4); margin-bottom: 10px;
  display: flex; align-items: flex-start; gap: 8px;
}
.footer-contact p i { color: var(--accent); margin-top: 3px; min-width: 14px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 20px 0; display: flex;
  justify-content: space-between; align-items: center;
}
.footer-bottom p { font-size: 13px; color: rgba(255,255,255,0.3); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-img { max-width: 500px; margin: 0 auto; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  #navbar nav { display: none; }
  .nav-phone { display: none; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .stat-divider { display: none; }
  .services-grid { grid-template-columns: 1fr; }
  .adv-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .about-badge-box { bottom: -10px; right: -10px; }
}

/* ===== ANIMATIONS ===== */
.fade-in {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }



/* ===== SIDEBAR =====*/
#sideBar {
  position: fixed;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.side-item {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  cursor: pointer;
}
.side-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  flex-shrink: 0;
  border-radius: 8px 0 0 8px;
  text-decoration: none;
}
.side-tel-icon    { background: #1a3a6b; }
.side-wechat-icon { background: #07c160; }
.side-qq-icon     { background: #1d4ed8; }
.side-expand {
  position: absolute;
  right: 44px;
  top: 50%;
  transform: translateY(-50%);
  background: #fff;
  border-radius: 10px 0 0 10px;
  box-shadow: -4px 4px 20px rgba(0,0,0,0.15);
  padding: 10px 14px;
  white-space: nowrap;
  font-size: 13px;
  font-weight: 600;
  color: #1a3a6b;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  font-family: inherit;
}
.side-item:hover .side-expand {
  opacity: 1;
  pointer-events: auto;
}
.wechat-expand {
  padding: 10px;
  text-align: center;
}
.wechat-expand img {
  width: 120px;
  height: 120px;
  border-radius: 8px;
  display: block;
}
.wechat-expand p {
  font-size: 11px;
  color: #666;
  margin-top: 6px;
  font-weight: 400;
}
@media (max-width: 768px) {
  #sideBar { display: none; }
}