/* =============================
   乐易知识产权 - 主样式文件
   ============================= */

:root {
  --primary: #1a3a6b;
  --primary-light: #2a5298;
  --accent: #c8a951;
  --accent-light: #e8c96a;
  --text-dark: #1a1a2e;
  --text-mid: #4a5568;
  --text-light: #718096;
  --bg-light: #f7f8fc;
  --bg-white: #ffffff;
  --border: #e2e8f0;
  --shadow: 0 4px 20px rgba(26, 58, 107, 0.10);
  --shadow-hover: 0 8px 32px rgba(26, 58, 107, 0.18);
  --radius: 8px;
  --radius-lg: 16px;
  --transition: 0.3s ease;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text-dark);
  background: var(--bg-white);
  line-height: 1.7;
}

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

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  text-align: center;
  margin-bottom: 12px;
}
.section-subtitle {
  text-align: center;
  color: var(--text-light);
  font-size: 1rem;
  margin-bottom: 56px;
}
.section-title span { color: var(--accent); }
.divider {
  width: 56px; height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  border-radius: 2px;
  margin: 12px auto 20px;
}

/* ===== HEADER / NAV ===== */
#header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.97);
  box-shadow: 0 2px 12px rgba(26,58,107,0.08);
  transition: box-shadow var(--transition);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.logo {
  display: flex; align-items: center; gap: 14px;
  text-decoration: none;
}
.logo-icon {
  width: 44px; height: 44px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; color: #fff; font-weight: 900;
  flex-shrink: 0;
}
.logo-text { display: flex; flex-direction: column; }
.logo-name {
  font-size: 1.12rem; font-weight: 700;
  color: var(--primary); line-height: 1.2;
}
.logo-tagline {
  font-size: 0.72rem; color: var(--accent);
  letter-spacing: 0.05em;
}

.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-menu a {
  padding: 8px 18px;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-mid);
  transition: all var(--transition);
}
.nav-menu a:hover, .nav-menu a.active {
  color: var(--primary);
  background: rgba(26,58,107,0.06);
}
.nav-cta {
  background: linear-gradient(135deg, var(--primary), var(--primary-light)) !important;
  color: #fff !important;
  padding: 9px 22px !important;
  border-radius: 6px !important;
  font-weight: 600 !important;
}
.nav-cta:hover { opacity: 0.9; transform: translateY(-1px); }

.nav-toggle {
  display: none;
  flex-direction: column; gap: 5px; cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  display: block; width: 24px; height: 2px;
  background: var(--primary); border-radius: 2px;
  transition: all var(--transition);
}

/* ===== HERO ===== */
#hero {
  padding-top: 72px;
  min-height: 100vh;
  display: flex; align-items: center;
  background: linear-gradient(135deg, #0d2550 0%, #1a3a6b 45%, #1e4080 70%, #1a3a6b 100%);
  position: relative; overflow: hidden;
}
#hero::before {
  content: '';
  position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60'%3E%3Ccircle cx='30' cy='30' r='1.5' fill='rgba(200,169,81,0.15)'/%3E%3C/svg%3E") repeat;
}
.hero-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  align-items: center; gap: 64px;
  position: relative; z-index: 1;
  padding: 80px 0;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(200,169,81,0.18);
  border: 1px solid rgba(200,169,81,0.35);
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 0.82rem; color: var(--accent-light);
  margin-bottom: 24px;
  font-weight: 500; letter-spacing: 0.04em;
}
.hero-badge::before { content: '★'; font-size: 0.75rem; }
.hero-title {
  font-size: 3rem; font-weight: 800;
  color: #fff; line-height: 1.25;
  margin-bottom: 20px;
}
.hero-title em { color: var(--accent-light); font-style: normal; }
.hero-desc {
  font-size: 1.05rem; color: rgba(255,255,255,0.75);
  margin-bottom: 40px; max-width: 520px;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: var(--primary); font-weight: 700; font-size: 1rem;
  padding: 14px 32px; border-radius: var(--radius);
  border: none; cursor: pointer;
  transition: all var(--transition); box-shadow: 0 4px 15px rgba(200,169,81,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(200,169,81,0.45); }
.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  border: 2px solid rgba(255,255,255,0.4);
  color: #fff; font-weight: 600; font-size: 1rem;
  padding: 13px 30px; border-radius: var(--radius);
  cursor: pointer; transition: all var(--transition);
  background: transparent;
}
.btn-outline:hover { border-color: rgba(255,255,255,0.8); background: rgba(255,255,255,0.08); transform: translateY(-2px); }

.hero-stats {
  display: flex; gap: 40px; margin-top: 56px;
}
.stat { text-align: center; }
.stat-num {
  font-size: 2.2rem; font-weight: 800;
  color: var(--accent-light); line-height: 1;
}
.stat-label { font-size: 0.82rem; color: rgba(255,255,255,0.6); margin-top: 4px; }

.hero-visual {
  display: flex; justify-content: center; align-items: center;
}
.hero-card-group {
  position: relative; width: 380px; height: 380px;
}
.hero-card {
  position: absolute;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}
.hero-card-main {
  width: 260px; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  border-color: rgba(200,169,81,0.35);
  background: rgba(200,169,81,0.1);
}
.hero-card-main .card-icon { font-size: 3rem; margin-bottom: 12px; }
.hero-card-main h3 { color: var(--accent-light); font-size: 1.1rem; font-weight: 700; margin-bottom: 6px; }
.hero-card-main p { color: rgba(255,255,255,0.7); font-size: 0.85rem; }
.hero-card-sm {
  width: 160px; padding: 14px 16px;
  border-radius: 10px;
}
.hero-card-sm .mini-icon { font-size: 1.4rem; margin-bottom: 6px; }
.hero-card-sm .mini-label { font-size: 0.78rem; color: rgba(255,255,255,0.8); font-weight: 600; }
.card-tl { top: 10px; left: 0; }
.card-tr { top: 10px; right: 0; }
.card-bl { bottom: 10px; left: 0; }
.card-br { bottom: 10px; right: 0; }

/* ===== SERVICES ===== */
#services {
  padding: 96px 0;
  background: var(--bg-light);
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.service-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: all var(--transition);
  position: relative; overflow: hidden;
}
.service-card::after {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  transform: scaleX(0); transform-origin: left;
  transition: transform var(--transition);
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.service-card:hover::after { transform: scaleX(1); }
.service-icon {
  width: 64px; height: 64px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem; margin-bottom: 20px;
  box-shadow: 0 4px 16px rgba(26,58,107,0.2);
}
.service-card h3 {
  font-size: 1.15rem; font-weight: 700;
  color: var(--primary); margin-bottom: 10px;
}
.service-card p {
  color: var(--text-light); font-size: 0.9rem; line-height: 1.7;
  margin-bottom: 20px;
}
.service-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-size: 0.75rem; font-weight: 500;
  padding: 4px 10px; border-radius: 4px;
  background: rgba(26,58,107,0.07);
  color: var(--primary);
}

/* ===== ABOUT ===== */
#about { padding: 96px 0; background: var(--bg-white); }
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 64px; align-items: center;
}
.about-image-wrap {
  position: relative;
}
.about-img-box {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  border-radius: var(--radius-lg);
  padding: 48px;
  text-align: center;
  color: #fff;
  min-height: 360px;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  box-shadow: var(--shadow-hover);
  position: relative; overflow: hidden;
}
.about-img-box::before {
  content: '';
  position: absolute; top: -40px; right: -40px;
  width: 200px; height: 200px;
  border-radius: 50%;
  background: rgba(200,169,81,0.15);
}
.about-img-box::after {
  content: '';
  position: absolute; bottom: -30px; left: -30px;
  width: 150px; height: 150px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
}
.about-center-icon { font-size: 5rem; margin-bottom: 16px; position: relative; z-index: 1; }
.about-img-box h3 { font-size: 1.5rem; font-weight: 700; margin-bottom: 8px; z-index: 1; position: relative; }
.about-img-box p { font-size: 0.9rem; opacity: 0.8; z-index: 1; position: relative; }

.about-badge {
  position: absolute; bottom: -16px; right: 24px;
  background: var(--bg-white); border-radius: 10px;
  padding: 14px 20px; box-shadow: var(--shadow-hover);
  display: flex; align-items: center; gap: 12px;
  border: 1px solid var(--border);
}
.about-badge .badge-num { font-size: 1.6rem; font-weight: 800; color: var(--accent); line-height: 1; }
.about-badge .badge-label { font-size: 0.8rem; color: var(--text-mid); }

.about-content h2 { font-size: 1.8rem; font-weight: 800; color: var(--primary); margin-bottom: 16px; }
.about-content .lead { font-size: 1.05rem; color: var(--text-mid); line-height: 1.8; margin-bottom: 28px; }
.about-features { display: flex; flex-direction: column; gap: 16px; margin-bottom: 36px; }
.feature-item {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 16px;
  background: var(--bg-light);
  border-radius: var(--radius);
  border-left: 3px solid var(--accent);
}
.feature-icon { font-size: 1.4rem; flex-shrink: 0; margin-top: 2px; }
.feature-item h4 { font-size: 0.95rem; font-weight: 700; color: var(--primary); margin-bottom: 3px; }
.feature-item p { font-size: 0.85rem; color: var(--text-light); }
.about-milestones { display: flex; gap: 32px; }
.milestone { text-align: center; }
.milestone-num { font-size: 1.8rem; font-weight: 800; color: var(--primary); line-height: 1; }
.milestone-suffix { color: var(--accent); font-size: 1rem; }
.milestone-label { font-size: 0.8rem; color: var(--text-light); margin-top: 4px; }

/* ===== NEWS ===== */
#news { padding: 96px 0; background: var(--bg-light); }
.news-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr;
  gap: 24px;
}
.news-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.news-img {
  height: 180px;
  display: flex; align-items: center; justify-content: center;
  font-size: 4rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  position: relative; overflow: hidden;
}
.news-img::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(to bottom, transparent 40%, rgba(0,0,0,0.3));
}
.news-card.featured .news-img { height: 240px; font-size: 5rem; }
.news-cat {
  position: absolute; top: 14px; left: 14px; z-index: 1;
  background: var(--accent); color: var(--primary);
  font-size: 0.72rem; font-weight: 700;
  padding: 4px 10px; border-radius: 4px;
}
.news-body { padding: 22px; }
.news-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.news-date { font-size: 0.78rem; color: var(--text-light); }
.news-card h3 { font-size: 1.0rem; font-weight: 700; color: var(--text-dark); margin-bottom: 10px; line-height: 1.5; }
.news-card.featured h3 { font-size: 1.2rem; }
.news-card p { font-size: 0.85rem; color: var(--text-light); line-height: 1.7; margin-bottom: 16px; }
.news-link {
  font-size: 0.85rem; font-weight: 600;
  color: var(--primary);
  display: inline-flex; align-items: center; gap: 4px;
}
.news-link:hover { color: var(--accent); }
.news-more { text-align: center; margin-top: 40px; }
.btn-more {
  display: inline-flex; align-items: center; gap: 8px;
  border: 2px solid var(--primary);
  color: var(--primary); font-weight: 600; font-size: 0.95rem;
  padding: 12px 32px; border-radius: var(--radius);
  cursor: pointer; transition: all var(--transition);
}
.btn-more:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }

/* ===== CONTACT ===== */
#contact { padding: 96px 0; background: var(--bg-white); }
.contact-grid {
  display: grid; grid-template-columns: 1fr 1.2fr;
  gap: 56px; align-items: start;
}
.contact-info h2 { font-size: 1.7rem; font-weight: 800; color: var(--primary); margin-bottom: 12px; }
.contact-info .lead { font-size: 0.95rem; color: var(--text-mid); line-height: 1.8; margin-bottom: 36px; }
.contact-items { display: flex; flex-direction: column; gap: 20px; }
.contact-item {
  display: flex; gap: 16px; align-items: flex-start;
}
.contact-item-icon {
  width: 48px; height: 48px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  box-shadow: 0 3px 12px rgba(26,58,107,0.2);
}
.contact-item-body h4 { font-size: 0.9rem; font-weight: 700; color: var(--primary); margin-bottom: 3px; }
.contact-item-body p { font-size: 0.88rem; color: var(--text-mid); line-height: 1.6; }

.contact-form {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  padding: 40px;
  border: 1px solid var(--border);
}
.contact-form h3 { font-size: 1.2rem; font-weight: 700; color: var(--primary); margin-bottom: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 600; color: var(--text-mid); margin-bottom: 7px; }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%; padding: 11px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem; font-family: inherit;
  color: var(--text-dark);
  background: var(--bg-white);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26,58,107,0.08);
}
.form-group textarea { resize: vertical; min-height: 110px; }
.btn-submit {
  width: 100%; padding: 14px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff; font-size: 1rem; font-weight: 700;
  border: none; border-radius: var(--radius);
  cursor: pointer; transition: all var(--transition);
  font-family: inherit;
  box-shadow: 0 4px 15px rgba(26,58,107,0.25);
}
.btn-submit:hover { opacity: 0.9; transform: translateY(-1px); box-shadow: 0 8px 25px rgba(26,58,107,0.3); }
.form-success {
  display: none;
  background: #e6f4ea; border: 1px solid #a8d5b0;
  border-radius: var(--radius); padding: 14px;
  color: #2d6a4f; font-size: 0.9rem; font-weight: 500;
  text-align: center; margin-top: 12px;
}

/* ===== FOOTER ===== */
#footer {
  background: var(--primary);
  color: rgba(255,255,255,0.85);
  padding: 64px 0 0;
}
.footer-grid {
  display: grid; grid-template-columns: 1.8fr 1fr 1fr 1fr;
  gap: 48px; margin-bottom: 48px;
}
.footer-brand .logo { margin-bottom: 16px; }
.footer-brand .logo-name, .footer-brand .logo-tagline { color: #fff !important; }
.footer-brand p { font-size: 0.85rem; line-height: 1.8; color: rgba(255,255,255,0.65); max-width: 280px; }
.footer-col h4 { font-size: 0.95rem; font-weight: 700; color: #fff; margin-bottom: 18px; padding-bottom: 8px; border-bottom: 1px solid rgba(255,255,255,0.15); }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a { font-size: 0.85rem; color: rgba(255,255,255,0.65); transition: color var(--transition); }
.footer-col ul a:hover { color: var(--accent-light); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding: 20px 0;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 12px;
}
.footer-bottom p { font-size: 0.8rem; color: rgba(255,255,255,0.45); }
.footer-bottom a { color: rgba(255,255,255,0.55); }
.footer-bottom a:hover { color: var(--accent-light); }

/* ===== FLOATING CTA ===== */
.float-cta {
  position: fixed; right: 24px; bottom: 32px; z-index: 900;
  display: flex; flex-direction: column; gap: 12px;
}
.float-btn {
  width: 52px; height: 52px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; cursor: pointer;
  box-shadow: 0 4px 16px rgba(0,0,0,0.18);
  transition: all var(--transition); border: none;
  position: relative;
}
.float-btn:hover { transform: translateY(-3px) scale(1.08); }
.float-btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: var(--primary);
}
.float-btn.secondary {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
}
.float-btn .tooltip {
  position: absolute; right: calc(100% + 10px); top: 50%; transform: translateY(-50%);
  background: var(--text-dark); color: #fff;
  font-size: 0.75rem; white-space: nowrap;
  padding: 5px 10px; border-radius: 5px;
  opacity: 0; pointer-events: none;
  transition: opacity var(--transition);
}
.float-btn:hover .tooltip { opacity: 1; }

/* ===== SCROLL TO TOP ===== */
#scrollTop {
  position: fixed; right: 24px; bottom: 100px; z-index: 900;
  width: 44px; height: 44px; border-radius: 50%;
  background: rgba(26,58,107,0.85); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; cursor: pointer;
  opacity: 0; pointer-events: none;
  transition: all var(--transition);
  border: none;
  box-shadow: 0 3px 12px rgba(26,58,107,0.3);
}
#scrollTop.visible { opacity: 1; pointer-events: auto; }
#scrollTop:hover { background: var(--primary); transform: translateY(-3px); }

/* ===== 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); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; gap: 48px; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-visual { display: none; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr 1fr; }
  .news-card.featured { grid-column: 1 / -1; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-menu { display: none; flex-direction: column; position: fixed; top: 72px; left: 0; right: 0; background: #fff; padding: 20px 24px 28px; box-shadow: 0 8px 24px rgba(0,0,0,0.12); }
  .nav-menu.open { display: flex; }
  .nav-toggle { display: flex; }
  .hero-title { font-size: 2rem; }
  .services-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .section-title { font-size: 1.6rem; }
  .form-row { grid-template-columns: 1fr; }
  .about-milestones { flex-wrap: wrap; gap: 20px; }
  .hero-stats { flex-wrap: wrap; gap: 24px; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .contact-form { padding: 24px 20px; }
}