/* ===== CSS Variables ===== */
:root {
  --primary: #4F6EF7;
  --primary-light: #6B85F9;
  --primary-dark: #3A56D4;
  --accent: #06D6A0;
  --accent-light: #2AEDB8;
  --bg-dark: #0A0E1A;
  --bg-card: #111827;
  --bg-card-hover: #1A2235;
  --bg-section: #0D1220;
  --bg-section-alt: #0F1528;
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --border-color: rgba(79, 110, 247, 0.15);
  --border-color-light: rgba(79, 110, 247, 0.08);
  --glow-primary: rgba(79, 110, 247, 0.3);
  --glow-accent: rgba(6, 214, 160, 0.3);
  --gradient-primary: linear-gradient(135deg, #4F6EF7, #06D6A0);
  --gradient-bg: linear-gradient(180deg, #0A0E1A 0%, #0F1528 50%, #0A0E1A 100%);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.2);
  --shadow-md: 0 8px 32px rgba(0,0,0,0.3);
  --shadow-lg: 0 16px 64px rgba(0,0,0,0.4);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  max-width: 100vw;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
input { font: inherit; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== Utility ===== */
.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== Navbar ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
  background: transparent;
}
.navbar.scrolled {
  background: rgba(10, 14, 26, 0.92);
  backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 rgba(79, 110, 247, 0.06);
  padding: 10px 0;
}
.nav-container {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  display: flex; align-items: center; gap: 6px; font-weight: 700; font-size: 1.25rem;
}
.logo-icon { display: flex; }
.logo-text { letter-spacing: -0.02em; }
.logo-divider {
  margin: 0 4px;
  color: var(--text-muted);
  opacity: 0.4;
  font-size: 0.9rem;
}
.logo-subtext {
  font-size: 1.25rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-link {
  font-size: 0.9rem; font-weight: 500; color: var(--text-secondary);
  transition: var(--transition); position: relative;
}
.nav-link:hover { color: var(--text-primary); }
.nav-link::after {
  content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px;
  background: var(--gradient-primary); transition: var(--transition);
}
.nav-link:hover::after { width: 100%; }
.nav-cta {
  background: var(--gradient-primary); color: #fff !important;
  padding: 8px 20px; border-radius: 100px; font-weight: 600;
}
.nav-cta::after { display: none; }
.nav-cta:hover { opacity: 0.9; transform: translateY(-1px); }
.nav-login-btn {
  background: transparent; color: var(--text-primary) !important;
  border: 1px solid rgba(79,110,247,0.5); padding: 8px 22px; border-radius: 100px;
  font-weight: 600;
}
.nav-login-btn::after { display: none; }
.nav-login-btn:hover { background: rgba(79,110,247,0.12); border-color: var(--primary); transform: translateY(-1px); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 4px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text-primary); transition: var(--transition); }

/* ===== Hero ===== */
.hero {
  position: relative; min-height: 100vh;
  display: grid; grid-template-columns: 1fr 1fr;
  align-items: center; gap: 60px;
  max-width: 1200px; margin: 0 auto; padding: 120px 24px 80px;
  width: 100%;
}
.hero-bg {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -1;
}
#heroCanvas { width: 100%; height: 100%; }
.hero-gradient {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(79,110,247,0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 50%, rgba(6,214,160,0.05) 0%, transparent 60%);
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; border-radius: 100px;
  background: rgba(79,110,247,0.1); border: 1px solid rgba(79,110,247,0.2);
  font-size: 0.85rem; color: var(--primary-light); margin-bottom: 24px;
}
.badge-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); animation: pulse 2s infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }
.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.5rem); font-weight: 800;
  line-height: 1.15; letter-spacing: -0.03em; margin-bottom: 24px;
}
.hero-desc {
  font-size: 1.1rem; color: var(--text-secondary); line-height: 1.8;
  max-width: 540px; margin-bottom: 36px;
}
.hero-actions { display: flex; gap: 16px; margin-bottom: 48px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px; border-radius: 100px; font-weight: 600;
  font-size: 0.95rem; transition: var(--transition);
}
.btn-primary {
  background: var(--gradient-primary); color: #fff;
  box-shadow: 0 4px 20px var(--glow-primary);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px var(--glow-primary); }
.btn-ghost {
  background: rgba(255,255,255,0.05); color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.btn-ghost:hover { background: rgba(255,255,255,0.1); border-color: var(--primary); }
.btn-lg { padding: 16px 36px; font-size: 1rem; }
.hero-stats { display: flex; gap: 40px; flex-wrap: wrap; }
.stat-item { display: flex; flex-direction: column; }
.stat-number {
  font-size: 2rem; font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.stat-suffix {
  font-size: 1.2rem; font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.stat-label { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }

/* Hero Visual - Agent Card */
.hero-visual { position: relative; display: flex; justify-content: center; }
.agent-card {
  width: 380px; max-width: 100%; background: var(--bg-card);
  border: 1px solid var(--border-color); border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow-lg);
  animation: float 6s ease-in-out infinite;
}
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
.agent-header {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 20px; border-bottom: 1px solid var(--border-color-light);
}
.agent-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: rgba(79,110,247,0.1); display: flex; align-items: center; justify-content: center;
}
.agent-name { font-weight: 600; font-size: 0.95rem; }
.agent-status { display: flex; align-items: center; gap: 6px; font-size: 0.8rem; color: var(--accent); }
.status-dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
  animation: pulse 2s infinite;
}
.agent-messages { padding: 20px; display: flex; flex-direction: column; gap: 12px; min-height: 200px; }
.msg { padding: 12px 16px; border-radius: var(--radius-md); font-size: 0.9rem; max-width: 85%; }
.msg-user {
  background: rgba(79,110,247,0.15); border: 1px solid rgba(79,110,247,0.2);
  align-self: flex-end; color: var(--primary-light);
}
.msg-agent {
  background: var(--bg-card-hover); border: 1px solid var(--border-color-light);
  align-self: flex-start;
}
.typing-indicator { display: flex; gap: 4px; padding: 4px 0; }
.typing-indicator span {
  width: 6px; height: 6px; border-radius: 50%; background: var(--text-muted);
  animation: typing 1.4s infinite;
}
.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }
@keyframes typing { 0%,60%,100% { opacity: 0.3; transform: translateY(0); } 30% { opacity: 1; transform: translateY(-4px); } }
.msg-content p { margin-bottom: 8px; font-size: 0.85rem; color: var(--text-secondary); }
.msg-content p:last-child { margin-bottom: 0; }
.msg-content strong { color: var(--text-primary); }
.msg-content .up { color: var(--accent); }
.mini-chart { display: flex; align-items: flex-end; gap: 8px; height: 80px; margin: 12px 0; }
.chart-bar {
  flex: 1; background: var(--gradient-primary); border-radius: 4px 4px 0 0;
  position: relative; min-height: 20px; transition: height 1s ease;
}
.chart-bar span {
  position: absolute; bottom: -20px; left: 50%; transform: translateX(-50%);
  font-size: 0.7rem; color: var(--text-muted);
}

/* ===== Section Common ===== */
.section-header { text-align: center; margin-bottom: 64px; }
.section-tag {
  display: inline-block; padding: 4px 14px; border-radius: 100px;
  background: rgba(79,110,247,0.1); border: 1px solid rgba(79,110,247,0.15);
  font-size: 0.8rem; font-weight: 600; color: var(--primary-light);
  text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 16px;
}
.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem); font-weight: 800;
  letter-spacing: -0.02em; margin-bottom: 16px;
}
.section-desc {
  font-size: 1.05rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto;
}

/* ===== Features ===== */
.features {
  padding: 120px 0; position: relative;
  background: var(--bg-section);
}
.features-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.feature-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-lg); padding: 32px;
  transition: var(--transition); position: relative; overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--gradient-primary); opacity: 0; transition: var(--transition);
}
.feature-card:hover {
  transform: translateY(-4px); border-color: var(--primary);
  box-shadow: 0 8px 40px rgba(79,110,247,0.1);
}
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  width: 52px; height: 52px; border-radius: var(--radius-md);
  background: rgba(79,110,247,0.1); display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px; color: var(--primary-light);
}
.feature-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 12px; }
.feature-desc { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 16px; }
.feature-example {
  padding: 10px 14px; border-radius: var(--radius-sm);
  background: rgba(6,214,160,0.06); border: 1px solid rgba(6,214,160,0.12);
}
.feature-example code {
  font-size: 0.82rem; color: var(--accent); font-family: 'SF Mono', 'Fira Code', monospace;
}

/* ===== Pricing 版本定价（对齐官网卡片语言） ===== */
.pricing {
  padding: 120px 0; background: var(--bg-section);
}
.pricing-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; align-items: stretch;
}
.pricing-card {
  position: relative; background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-lg); padding: 40px 32px;
  display: flex; flex-direction: column;
  transition: var(--transition);
}
.pricing-card:hover {
  transform: translateY(-4px); box-shadow: 0 8px 40px rgba(79,110,247,0.08);
}
.pricing-card-featured {
  border-color: var(--primary);
  background: linear-gradient(180deg, rgba(79,110,247,0.06) 0%, var(--bg-card) 100%);
  box-shadow: 0 8px 48px rgba(79,110,247,0.12);
}
.pricing-card-featured:hover {
  transform: translateY(-4px); box-shadow: 0 16px 64px rgba(79,110,247,0.18);
}
.pricing-flag {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  padding: 4px 16px; border-radius: 100px; font-size: 0.78rem; font-weight: 600;
  background: var(--gradient-primary); color: #fff; white-space: nowrap;
  box-shadow: 0 4px 16px var(--glow-primary);
}
.pricing-version {
  font-size: 0.85rem; font-weight: 600; color: var(--primary-light);
  margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.05em;
}
.pricing-head h3 { font-size: 1.35rem; font-weight: 700; margin-bottom: 6px; }
.pricing-sub { font-size: 0.85rem; color: var(--text-secondary); }
.pricing-price { display: flex; align-items: baseline; gap: 8px; margin: 24px 0; }
.price-num { font-size: 2.2rem; font-weight: 800; color: var(--text-primary); }
.pricing-card-featured .price-num { font-size: 2.4rem; color: var(--primary-light); }
.price-period { font-size: 0.85rem; color: var(--text-secondary); }
.pricing-features { list-style: none; margin: 0 0 28px; flex: 1; display: flex; flex-direction: column; gap: 10px; }
.pricing-features li {
  display: flex; align-items: center; gap: 10px;
  font-size: 0.9rem; color: var(--text-secondary); line-height: 1.5;
}
.pricing-features li .pf-icon { color: var(--accent); flex-shrink: 0; }
.pricing-features li.off { color: var(--text-muted); opacity: 0.55; }
.pricing-features li.off .pf-icon { color: var(--text-muted); }
.pricing-features li.hl { color: var(--text-primary); font-weight: 600; }
.pricing-features li.hl .pf-icon { color: var(--primary-light); }
.pricing-cta {
  display: block; width: 100%; text-align: center;
  padding: 12px 16px; border-radius: var(--radius-md);
  font-size: 0.92rem; font-weight: 600; color: var(--primary-light);
  background: rgba(79,110,247,0.06); border: 1px solid rgba(79,110,247,0.15);
  transition: var(--transition); text-decoration: none;
}
.pricing-cta:hover {
  background: rgba(79,110,247,0.12); border-color: var(--primary);
  transform: translateY(-2px);
}
.pricing-cta-featured {
  background: var(--gradient-primary); border: none; color: #fff;
  box-shadow: 0 4px 20px var(--glow-primary);
}
.pricing-cta-featured:hover {
  background: var(--gradient-primary); box-shadow: 0 8px 30px var(--glow-primary);
  transform: translateY(-2px);
}
.pricing-note { text-align: center; font-size: 0.82rem; color: var(--text-secondary); margin-top: 36px; }

@media (max-width: 960px) {
  .pricing-grid { grid-template-columns: 1fr; max-width: 420px; margin: 0 auto; }
}

/* ===== Advantages ===== */
.advantages {
  padding: 120px 0; background: var(--bg-section-alt);
}
.advantages-layout {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.advantage-main { display: flex; flex-direction: column; gap: 8px; }
.advantage-item {
  display: flex; gap: 20px; padding: 20px 24px;
  border-radius: var(--radius-md); cursor: pointer;
  transition: var(--transition); border: 1px solid transparent;
}
.advantage-item:hover, .advantage-item.active {
  background: rgba(79,110,247,0.05); border-color: var(--border-color);
}
.advantage-item.active { border-color: var(--primary); }
.advantage-num {
  font-size: 1.5rem; font-weight: 800; color: var(--primary);
  min-width: 40px; line-height: 1;
}
.advantage-content h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.advantage-content p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }
.advantage-visual { position: relative; height: 400px; }
.advantage-card-stack { position: relative; width: 100%; height: 100%; }
.adv-card {
  position: absolute; width: 100%; border-radius: var(--radius-lg);
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  opacity: 0; transform: translateY(20px) scale(0.95);
  pointer-events: none;
}
.adv-card.active {
  opacity: 1; transform: translateY(0) scale(1); pointer-events: auto;
}
.adv-card-glow {
  position: absolute; inset: -1px; border-radius: var(--radius-lg);
  background: var(--gradient-primary); opacity: 0.15; filter: blur(20px);
}
.adv-card-inner {
  position: relative; background: var(--bg-card);
  border: 1px solid var(--border-color); border-radius: var(--radius-lg);
  padding: 40px; height: 100%;
}
.adv-card-icon { margin-bottom: 24px; }
.adv-card-inner h4 { font-size: 1.3rem; font-weight: 700; margin-bottom: 12px; }
.adv-card-inner p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 20px; }
.adv-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.adv-tags span {
  padding: 4px 12px; border-radius: 100px; font-size: 0.8rem;
  background: rgba(79,110,247,0.1); border: 1px solid rgba(79,110,247,0.15);
  color: var(--primary-light);
}

/* ===== Demo ===== */
.demo {
  padding: 120px 0; background: var(--bg-section);
}
.demo-container {
  display: grid; grid-template-columns: 260px 1fr; gap: 24px;
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-xl); overflow: hidden;
  box-shadow: var(--shadow-lg);
  min-width: 0;
}
.demo-sidebar {
  padding: 24px; border-right: 1px solid var(--border-color-light);
  display: flex; flex-direction: column; gap: 16px;
}
.demo-sidebar-title { font-size: 0.85rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }

/* Top navigation items */
.demo-nav-items { display: flex; flex-direction: column; gap: 4px; }
.demo-nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 14px; border-radius: var(--radius-sm);
  font-size: 0.9rem; color: var(--text-secondary);
  background: none; border: none; cursor: pointer;
  transition: var(--transition); text-align: left; width: 100%;
  position: relative;
}
.demo-nav-item:hover {
  background: rgba(255,255,255,0.04);
  color: var(--text-primary);
}
.demo-nav-item.active {
  background: rgba(79,110,247,0.12);
  color: var(--primary-light);
}
.demo-nav-item svg { flex-shrink: 0; }

/* Red dot badge */
.nav-dot {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ef4444;
  animation: dotPulse 2s ease-in-out infinite;
}
@keyframes dotPulse {
  0%, 100% { opacity: 1; transform: translateY(-50%) scale(1); }
  50% { opacity: 0.6; transform: translateY(-50%) scale(1.3); }
}

/* Number badge（学习审核待审数） */
.nav-count {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  min-width: 18px; height: 18px; padding: 0 5px; border-radius: 9px;
  display: inline-flex; align-items: center; justify-content: center;
  background: rgba(79,110,247,0.18); color: var(--primary-light);
  font-size: 0.7rem; font-weight: 600;
}

.demo-nav-divider {
  height: 1px;
  background: var(--border-color-light);
  margin: 16px 0 12px 0;
}

.demo-shortcuts { display: flex; flex-direction: column; gap: 6px; }
.shortcut-btn {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border-radius: var(--radius-sm);
  font-size: 0.88rem; color: var(--text-secondary);
  transition: var(--transition); text-align: left;
}
.shortcut-btn:hover { background: rgba(79,110,247,0.08); color: var(--text-primary); }
.shortcut-btn.active {
  background: rgba(79,110,247,0.12); color: var(--primary-light);
  border: 1px solid rgba(79,110,247,0.2);
}
.demo-sidebar-info {
  margin-top: auto; padding: 14px; border-radius: var(--radius-sm);
  background: rgba(6,214,160,0.05); border: 1px solid rgba(6,214,160,0.1);
}
.demo-sidebar-info p { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.6; }
.demo-chat { display: flex; flex-direction: column; min-height: 520px; }
.chat-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 24px; border-bottom: 1px solid var(--border-color-light);
}
.chat-header-left { display: flex; align-items: center; gap: 12px; }
.chat-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: rgba(79,110,247,0.1); display: flex; align-items: center; justify-content: center;
}
.chat-title { font-weight: 600; font-size: 0.95rem; }
.chat-subtitle { font-size: 0.8rem; color: var(--text-muted); }
.chat-header-right {
  display: flex; align-items: center; gap: 12px;
}
.chat-enter-btn {
  display: flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: var(--radius-sm);
  font-size: 0.82rem; color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}
.chat-enter-btn:hover {
  background: rgba(79,110,247,0.1);
  color: var(--primary-light);
}
.chat-enter-btn svg { flex-shrink: 0; }
.chat-badge {
  padding: 4px 12px; border-radius: 100px; font-size: 0.75rem; font-weight: 600;
  background: var(--gradient-primary); color: #fff;
}
.chat-body {
  flex: 1; padding: 24px; overflow-y: auto;
  display: flex; flex-direction: column; gap: 16px;
}
.chat-msg { display: flex; gap: 10px; max-width: 80%; animation: msgIn 0.3s ease; }
@keyframes msgIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.chat-msg.user { align-self: flex-end; flex-direction: row-reverse; }
.chat-msg-avatar {
  width: 32px; height: 32px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 600;
}
.chat-msg.agent .chat-msg-avatar { background: rgba(79,110,247,0.15); color: var(--primary-light); }
.chat-msg.user .chat-msg-avatar { background: rgba(6,214,160,0.15); color: var(--accent); }
.chat-msg-bubble {
  padding: 12px 16px; border-radius: var(--radius-md); font-size: 0.9rem; line-height: 1.6;
}
.chat-msg.agent .chat-msg-bubble {
  background: var(--bg-card-hover); border: 1px solid var(--border-color-light);
}
.chat-msg.user .chat-msg-bubble {
  background: rgba(79,110,247,0.15); border: 1px solid rgba(79,110,247,0.2);
  color: var(--primary-light);
}
.chat-msg-bubble .data-card {
  margin-top: 10px; padding: 12px; border-radius: var(--radius-sm);
  background: rgba(79,110,247,0.06); border: 1px solid rgba(79,110,247,0.1);
}
.chat-msg-bubble .data-card .data-row {
  display: flex; justify-content: space-between; padding: 4px 0;
  font-size: 0.85rem;
}
.chat-msg-bubble .data-card .data-row .label { color: var(--text-muted); }
.chat-msg-bubble .data-card .data-row .value { font-weight: 600; color: var(--text-primary); }
.chat-msg-bubble .data-card .data-row .value.up { color: var(--accent); }
.chat-typing { display: flex; gap: 4px; padding: 8px 0; }
.chat-typing span {
  width: 6px; height: 6px; border-radius: 50%; background: var(--text-muted);
  animation: typing 1.4s infinite;
}
.chat-typing span:nth-child(2) { animation-delay: 0.2s; }
.chat-typing span:nth-child(3) { animation-delay: 0.4s; }
.chat-input-area {
  padding: 16px 24px; border-top: 1px solid var(--border-color-light);
}
.chat-input-wrapper { display: flex; gap: 12px; align-items: center; }
.chat-input {
  flex: 1; padding: 12px 16px; border-radius: 100px;
  background: var(--bg-card-hover); border: 1px solid var(--border-color);
  color: var(--text-primary); font-size: 0.9rem; outline: none;
  transition: var(--transition);
}
.chat-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,110,247,0.1); }
.chat-input::placeholder { color: var(--text-muted); }
.chat-send {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--gradient-primary); display: flex; align-items: center; justify-content: center;
  transition: var(--transition); color: #fff;
}
.chat-send:hover { transform: scale(1.05); box-shadow: 0 4px 16px var(--glow-primary); }

/* ===== Scenarios ===== */
.scenarios {
  padding: 120px 0; background: var(--bg-section-alt);
}
.scenarios-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.scenario-card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-lg); padding: 36px;
  transition: var(--transition); position: relative;
}
.scenario-card:hover {
  transform: translateY(-4px); box-shadow: 0 8px 40px rgba(79,110,247,0.08);
}
.scenario-card.featured {
  border-color: var(--primary);
  background: linear-gradient(180deg, rgba(79,110,247,0.06) 0%, var(--bg-card) 100%);
}
.scenario-badge {
  position: absolute; top: -12px; right: 24px;
  padding: 4px 14px; border-radius: 100px; font-size: 0.75rem; font-weight: 600;
  background: var(--gradient-primary); color: #fff;
}
.scenario-role {
  font-size: 0.85rem; font-weight: 600; color: var(--primary-light);
  margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.03em;
}
.scenario-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 20px; }
.scenario-list { list-style: none; display: flex; flex-direction: column; gap: 12px; margin-bottom: 24px; }
.scenario-list li { display: flex; align-items: center; gap: 10px; font-size: 0.9rem; color: var(--text-secondary); }
.scenario-quote {
  padding: 16px; border-radius: var(--radius-md);
  background: rgba(79,110,247,0.04); border: 1px solid var(--border-color-light);
}
.scenario-quote p { font-size: 0.88rem; color: var(--text-secondary); font-style: italic; margin-bottom: 8px; }
.scenario-quote span { font-size: 0.8rem; color: var(--text-muted); }

/* ===== Tech ===== */
.tech {
  padding: 120px 0; background: var(--bg-section);
}
.tech-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.tech-item {
  text-align: center; padding: 36px 24px;
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-lg); transition: var(--transition);
}
.tech-item:hover {
  transform: translateY(-4px); border-color: var(--primary);
}
.tech-icon-wrap {
  width: 64px; height: 64px; border-radius: 50%; margin: 0 auto 20px;
  background: rgba(79,110,247,0.1); display: flex; align-items: center; justify-content: center;
  color: var(--primary-light);
}
.tech-item h4 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.tech-item p { font-size: 0.85rem; color: var(--text-secondary); }

/* ===== CTA ===== */
.cta { padding: 120px 0; background: var(--bg-section-alt); }
.cta-card {
  position: relative; border-radius: var(--radius-xl); overflow: hidden;
  background: var(--bg-card); border: 1px solid var(--border-color);
  padding: 80px 40px;
}
.cta-bg-effect { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.cta-orb {
  position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.15;
}
.cta-orb-1 { width: 400px; height: 400px; background: var(--primary); top: -100px; right: -100px; }
.cta-orb-2 { width: 300px; height: 300px; background: var(--accent); bottom: -80px; left: -80px; }
.cta-content { position: relative; text-align: center; max-width: 560px; margin: 0 auto; }
.cta-content h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 800; margin-bottom: 16px; }
.cta-content > p { font-size: 1.05rem; color: var(--text-secondary); margin-bottom: 36px; }
.cta-form { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.cta-input {
  padding: 14px 20px; border-radius: 100px;
  background: var(--bg-card-hover); border: 1px solid var(--border-color);
  color: var(--text-primary); font-size: 0.9rem; outline: none;
  min-width: 180px; flex: 1; transition: var(--transition);
}
.cta-input:focus { border-color: var(--primary); }
.cta-input::placeholder { color: var(--text-muted); }
.cta-note { font-size: 0.82rem; color: var(--text-muted); margin-top: 16px; }
.cta-feedback {
  margin-top: 16px; padding: 14px 20px; border-radius: var(--radius-md);
  font-size: 0.9rem; animation: msgIn 0.3s ease;
}
.cta-feedback.success {
  background: rgba(6,214,160,0.1); border: 1px solid rgba(6,214,160,0.25);
  color: var(--accent);
}
.cta-feedback.error {
  background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.25);
  color: #f87171;
}
.cta-submit-loading {
  opacity: 0.7; pointer-events: none;
}

/* ===== Footer ===== */
.footer {
  padding: 60px 0 30px; background: var(--bg-dark);
  border-top: 1px solid var(--border-color-light);
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
  margin-bottom: 40px;
}
.footer-desc { font-size: 0.9rem; color: var(--text-secondary); margin-top: 16px; max-width: 300px; }
.footer-links h4 { font-size: 0.9rem; font-weight: 600; margin-bottom: 16px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 0.88rem; color: var(--text-secondary); transition: var(--transition); }
.footer-links a:hover { color: var(--primary-light); }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 24px; border-top: 1px solid var(--border-color-light);
}
.footer-bottom p { font-size: 0.82rem; color: var(--text-muted); }
.footer-bottom-links { display: flex; gap: 24px; }
.footer-bottom-links a { font-size: 0.82rem; color: var(--text-muted); transition: var(--transition); }
.footer-bottom-links a:hover { color: var(--primary-light); }

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

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero { grid-template-columns: 1fr; text-align: center; padding-top: 100px; }
  .hero-desc { margin: 0 auto 36px; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-visual { margin-top: 40px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .advantages-layout { grid-template-columns: 1fr; }
  .advantage-visual { height: 300px; }
  .adv-card-inner { padding: 24px; }
  .scenarios-grid { grid-template-columns: 1fr; }
  .scenario-card { padding: 24px; }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .nav-links { display: none; position: absolute; top: 100%; left: 0; right: 0; background: rgba(10,14,26,0.98); backdrop-filter: blur(20px); flex-direction: column; padding: 24px; gap: 16px; border-bottom: 1px solid var(--border-color); max-height: 80vh; overflow-y: auto; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .logo-subtext { display: none; }
  .logo-divider { display: none; }
  .hero { padding: 100px 16px 60px; gap: 30px; }
  .hero-title { font-size: clamp(1.8rem, 7vw, 2.5rem); }
  .hero-desc { font-size: 0.95rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .hero-stats { gap: 20px; flex-wrap: wrap; }
  .stat-number { font-size: 1.5rem; }
  .hero-visual { padding: 0 8px; }
  .features-grid { grid-template-columns: 1fr; }
  .feature-card { padding: 24px; }
  .demo-container { grid-template-columns: 1fr; border-radius: var(--radius-lg); }
  .demo-sidebar { border-right: none; border-bottom: 1px solid var(--border-color-light); padding: 16px; }
  .demo-nav-items { flex-direction: row; flex-wrap: wrap; gap: 6px; }
  .demo-nav-item { min-width: auto; padding: 8px 12px; font-size: 0.85rem; }
  .demo-shortcuts { flex-direction: row; flex-wrap: wrap; gap: 6px; }
  .shortcut-btn { min-width: auto; padding: 8px 12px; font-size: 0.85rem; }
  .demo-sidebar-info { display: none; }
  .demo-chat { min-height: 400px; }
  .chat-header { padding: 12px 16px; flex-wrap: wrap; gap: 8px; }
  .chat-enter-btn span { display: none; }
  .chat-body { padding: 16px; }
  .chat-input-area { padding: 12px 16px; }
  .chat-msg { max-width: 90%; }
  .scenarios-grid { grid-template-columns: 1fr; }
  .scenario-card { padding: 24px; }
  .tech-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .cta-form { flex-direction: column; }
  .cta-input { min-width: auto; }
  .cta-card { padding: 40px 20px; }
  .cta-orb-1 { width: 200px; height: 200px; }
  .cta-orb-2 { width: 150px; height: 150px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .section-header { margin-bottom: 40px; }
  .section-title { font-size: 1.5rem; }
  .section-desc { font-size: 0.9rem; }
  .features, .advantages, .demo, .scenarios, .tech, .contact { padding: 60px 0; }
  .advantages-layout { grid-template-columns: 1fr; gap: 30px; }
  .advantage-visual { height: 260px; }
  .adv-card-inner { padding: 20px; }
  .adv-card-inner h4 { font-size: 1.1rem; }
  .adv-card-inner p { font-size: 0.88rem; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 1.6rem; }
  .hero-badge { font-size: 0.78rem; padding: 5px 12px; }
  .btn { padding: 12px 20px; font-size: 0.88rem; }
  .btn-lg { padding: 14px 24px; }
  .agent-card { width: 100%; }
  .stat-item { min-width: 80px; }
  .advantage-item { padding: 14px 16px; }
  .advantage-num { font-size: 1.2rem; }
  .advantage-content h3 { font-size: 1rem; }
  .scenario-title { font-size: 1.1rem; }
  .tech-item { padding: 24px 16px; }
  .cta-content h2 { font-size: 1.4rem; }
  .footer-desc { max-width: 100%; }
}