/* ==================== AI投研智能体 - 全站共享样式 ==================== */

:root {
  --bg-0: #06060a;
  --bg-1: #0b0d14;
  --bg-2: #10131c;
  --card: rgba(20, 24, 36, 0.6);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-border-hover: rgba(255, 255, 255, 0.16);
  --text-0: #e6e8ee;
  --text-1: #a5adba;
  --text-2: #6b7280;
  --accent: #22d3ee;
  --accent-dim: rgba(34, 211, 238, 0.15);
  --accent-glow: rgba(34, 211, 238, 0.4);
  --bull: #f59e0b;
  --bear: #ef4444;
  --success: #10b981;
  --warn: #f59e0b;
  --danger: #ef4444;
  --purple: #8b5cf6;
  --nav-h: 64px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg-0);
  color: var(--text-0);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(34, 211, 238, 0.1) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 30%, rgba(139, 92, 246, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 20% 70%, rgba(16, 185, 129, 0.05) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

a { color: inherit; text-decoration: none; }

/* ==================== Navigation ==================== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(6, 6, 10, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--card-border);
  z-index: 1000;
}
.nav-inner {
  max-width: 1440px;
  height: 100%;
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-0);
}
.nav-logo img { width: 32px; height: 32px; }
.nav-logo span {
  background: linear-gradient(135deg, #fff 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links a {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text-1);
  transition: all 0.2s;
}
.nav-links a:hover {
  color: var(--text-0);
  background: rgba(255, 255, 255, 0.05);
}
.nav-links a.active {
  color: var(--accent);
  background: var(--accent-dim);
}
.nav-cta {
  padding: 8px 18px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), #0891b2);
  color: #06060a;
  font-weight: 600;
  font-size: 0.88rem;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
}
.nav-cta:hover { filter: brightness(1.15); box-shadow: 0 4px 16px var(--accent-glow); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-0);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ==================== Layout ==================== */
.page {
  padding-top: var(--nav-h);
  position: relative;
  z-index: 1;
}
.container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 40px;
}

/* ==================== Section ==================== */
.section { padding: 80px 0; }
.section-head {
  text-align: center;
  margin-bottom: 56px;
}
.section-head h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #fff 0%, var(--text-1) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-head p {
  color: var(--text-2);
  font-size: 1.05rem;
}

/* ==================== Card ==================== */
.card {
  background: var(--card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 32px;
  transition: border-color 0.3s, transform 0.3s;
}
.card:hover {
  border-color: var(--card-border-hover);
  transform: translateY(-3px);
}
.card-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--accent-dim), rgba(139, 92, 246, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 26px;
}
.card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-0);
  margin-bottom: 10px;
}
.card p {
  font-size: 0.92rem;
  color: var(--text-2);
  line-height: 1.75;
}

/* ==================== Grid ==================== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* ==================== Buttons ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.25s;
  border: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #0891b2);
  color: #06060a;
}
.btn-primary:hover { filter: brightness(1.15); box-shadow: 0 4px 20px var(--accent-glow); }
.btn-ghost {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-0);
  border: 1px solid var(--card-border);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.08); border-color: var(--card-border-hover); }

/* ==================== Tag ==================== */
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--accent-dim);
  border: 1px solid rgba(34, 211, 238, 0.2);
  color: var(--accent);
  letter-spacing: 0.04em;
}

/* ==================== Footer ==================== */
.footer {
  border-top: 1px solid var(--card-border);
  padding: 60px 40px 30px;
  margin-top: 40px;
}
.footer-inner {
  max-width: 1440px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
}
.footer-brand .nav-logo { margin-bottom: 12px; }
.footer-brand p { color: var(--text-2); font-size: 0.82rem; line-height: 1.7; }
.footer-col h4 {
  font-size: 0.88rem;
  color: var(--text-1);
  margin-bottom: 14px;
  font-weight: 600;
}
.footer-col a {
  display: block;
  font-size: 0.82rem;
  color: var(--text-2);
  padding: 4px 0;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  max-width: 1440px;
  margin: 30px auto 0;
  padding-top: 20px;
  border-top: 1px solid var(--card-border);
  text-align: center;
  color: var(--text-2);
  font-size: 0.78rem;
  line-height: 1.8;
}
.footer-bottom a { color: var(--text-1); }
.footer-bottom a:hover { color: var(--accent); }

/* ==================== Animations ==================== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
@keyframes pulse {
  0%, 100% { opacity: 0.7; }
  50% { opacity: 1; }
}
.fade-up { animation: fadeUp 0.6s ease-out both; }
.fade-up:nth-child(2) { animation-delay: 0.1s; }
.fade-up:nth-child(3) { animation-delay: 0.2s; }
.fade-up:nth-child(4) { animation-delay: 0.3s; }

/* ==================== Responsive ==================== */
@media (min-width: 1921px) {
  .container, .nav-inner, .footer-inner, .footer-bottom { max-width: 1600px; }
}
@media (max-width: 1200px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    background: rgba(6, 6, 10, 0.95);
    backdrop-filter: blur(20px);
    padding: 20px;
    gap: 4px;
    border-bottom: 1px solid var(--card-border);
  }
  .nav-links.open { display: flex; }
  .nav-links a { width: 100%; }
  .nav-toggle { display: block; }
  .nav-cta { display: none; }
}

@media (max-width: 560px) {
  .container { padding: 0 16px; }
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .section { padding: 40px 0; }
  .nav-inner { padding: 0 16px; }
  .footer { padding: 40px 16px 20px; }
  .card { padding: 20px; }
}