/* ============================================
   QuantPilot - Professional Dark Theme CSS
   ============================================ */

/* ─── Layout ─────────────────────────────────────── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-title { font-size: 2.2rem; font-weight: 800; margin-bottom: 12px; }
.section-desc { color: var(--text-secondary); font-size: 1.1rem; }
.section-badge { display: inline-block; padding: 4px 12px; background: var(--accent-dim); color: var(--accent); border-radius: 20px; font-size: 0.85rem; font-weight: 600; margin-bottom: 12px; }

/* ─── Navbar ─────────────────────────────────────── */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10,10,15,0.85); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: all 0.3s;
}
.navbar.scrolled { background: rgba(10,10,15,0.97); }
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.2rem; font-weight: 800;
}
.nav-links { display: flex; gap: 32px; }
.nav-link { color: var(--text-secondary); font-size: 0.95rem; transition: color 0.2s; }
.nav-link:hover { color: var(--text-primary); }
.nav-actions { display: flex; gap: 12px; align-items: center; }
.nav-mobile-toggle { display: none; background: none; border: none; color: var(--text-primary); cursor: pointer; padding: 8px; }

/* ─── Buttons ─────────────────────────────────────── */
.btn-primary {
  background: var(--accent); color: #000; border: none;
  padding: 10px 20px; border-radius: var(--radius-sm);
  font-weight: 600; cursor: pointer; font-size: 0.95rem;
  transition: all 0.2s; display: inline-flex; align-items: center; gap: 6px;
}
.btn-primary:hover { background: var(--accent-light); transform: translateY(-1px); }
.btn-accent {
  background: var(--accent); color: #000; border: none;
  padding: 10px 20px; border-radius: var(--radius-sm);
  font-weight: 600; cursor: pointer; font-size: 0.95rem;
  transition: all 0.2s; display: inline-flex; align-items: center; gap: 6px;
}
.btn-accent:hover { background: var(--accent-light); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(245,158,11,0.3); }
.btn-outline {
  background: transparent; color: var(--text-primary); border: 1px solid var(--border);
  padding: 10px 20px; border-radius: var(--radius-sm);
  font-weight: 600; cursor: pointer; font-size: 0.95rem;
  transition: all 0.2s; display: inline-flex; align-items: center; gap: 6px;
}
.btn-outline:hover { border-color: var(--text-muted); background: rgba(255,255,255,0.03); }
.btn-ghost {
  background: transparent; color: var(--text-secondary); border: none;
  padding: 8px 16px; border-radius: var(--radius-sm);
  cursor: pointer; font-size: 0.95rem; transition: color 0.2s;
}
.btn-ghost:hover { color: var(--text-primary); }
.btn-lg { padding: 14px 28px; font-size: 1rem; border-radius: var(--radius); }
.btn-sm { padding: 6px 14px; font-size: 0.85rem; }
.btn-full { width: 100%; justify-content: center; }

/* ─── Hero ────────────────────────────────────────── */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  padding: 100px 24px 80px;
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.hero-glow {
  position: absolute; top: 20%; left: 50%; transform: translateX(-50%);
  width: 600px; height: 400px;
  background: radial-gradient(ellipse, rgba(245,158,11,0.12) 0%, transparent 70%);
  pointer-events: none;
}
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 0%, transparent 100%);
}
.hero-content { position: relative; z-index: 1; text-align: center; max-width: 800px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 30px; font-size: 0.85rem; color: var(--text-secondary);
  margin-bottom: 24px;
}
.badge-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--green); animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}
.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900; line-height: 1.1; margin-bottom: 24px;
}
.gradient-text {
  background: linear-gradient(135deg, var(--accent) 0%, #f97316 50%, var(--accent-light) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1.15rem; color: var(--text-secondary);
  line-height: 1.8; margin-bottom: 40px;
}
.hero-desc strong { color: var(--accent); }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 48px; }
.hero-stats {
  display: flex; align-items: center; justify-content: center; gap: 24px;
  padding: 20px; background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); max-width: 500px; margin: 0 auto;
}
.stat { text-align: center; }
.stat-num { display: block; font-size: 1.5rem; font-weight: 800; color: var(--text-primary); }
.stat-label { font-size: 0.8rem; color: var(--text-muted); }
.stat-divider { width: 1px; height: 32px; background: var(--border); }

/* ─── Steps ───────────────────────────────────────── */
.steps {
  display: flex; align-items: center; justify-content: center; gap: 16px; flex-wrap: wrap;
}
.step {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px; width: 220px; text-align: center;
}
.step-icon {
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--accent-dim); color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; font-weight: 800; margin: 0 auto 16px;
}
.step h3 { font-size: 1.1rem; margin-bottom: 8px; }
.step p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.5; }
.step-arrow { color: var(--text-muted); display: flex; }

/* ─── Features ───────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  transition: all 0.3s;
}
.feature-card:hover {
  border-color: var(--accent); transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}
.feature-icon { font-size: 2rem; margin-bottom: 16px; display: block; }
.feature-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.feature-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

/* ─── Courses ──────────────────────────────────────── */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}
.course-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
  display: flex; flex-direction: column; gap: 12px;
  transition: all 0.3s; position: relative; overflow: hidden;
}
.course-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.course-card.popular::before {
  content: '最受欢迎';
  position: absolute; top: 12px; right: -28px;
  background: var(--accent); color: #000;
  font-size: 0.7rem; font-weight: 700; padding: 3px 32px;
  transform: rotate(45deg);
}
.course-card.recommended { border-color: var(--accent); }
.course-level {
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 1px; color: var(--accent);
}
.course-card h3 { font-size: 1.1rem; font-weight: 700; }
.course-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}
.course-price {
  display: flex; align-items: baseline; gap: 6px;
}
.price-amount { font-size: 1.8rem; font-weight: 900; color: var(--accent); }
.price-unit { font-size: 0.85rem; color: var(--text-muted); }
.price-free { font-size: 1.5rem; font-weight: 800; color: var(--green); }
.course-features { list-style: none; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.course-features li {
  font-size: 0.85rem; color: var(--text-secondary);
  display: flex; align-items: flex-start; gap: 6px;
}
.course-features li::before { content: '✓'; color: var(--green); font-weight: 700; flex-shrink: 0; }
.course-owned { background: var(--green-dim); color: var(--green); border: none; padding: 10px; border-radius: var(--radius-sm); font-weight: 600; text-align: center; cursor: default; }
.course-btn { background: var(--accent); color: #000; border: none; padding: 10px; border-radius: var(--radius-sm); font-weight: 600; cursor: pointer; text-align: center; transition: all 0.2s; }
.course-btn:hover { background: var(--accent-light); }
.course-btn-owned { background: var(--green-dim) !important; color: var(--green) !important; border: 1.5px solid var(--green) !important; }
.course-btn-owned:hover { background: var(--green) !important; color: #000 !important; }

/* ─── Pricing ──────────────────────────────────────── */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px; margin-bottom: 40px;
}
.payment-info {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px; max-width: 700px; margin: 0 auto;
}
.payment-info h3 { font-size: 1.1rem; margin-bottom: 20px; }
.payment-methods { display: flex; gap: 20px; flex-wrap: wrap; margin-bottom: 16px; }
.payment-method {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px; background: var(--bg-secondary); border-radius: var(--radius-sm);
  flex: 1; min-width: 140px;
}
.pm-icon { font-size: 1.5rem; }
.payment-method small { display: block; color: var(--text-muted); font-size: 0.75rem; }
.payment-note { font-size: 0.85rem; color: var(--text-secondary); margin-top: 12px; }

/* ─── Affiliate Section ───────────────────────────── */
.affiliate-section { background: var(--bg-secondary); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.affiliate-inner {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
}
.affiliate-content h2 { font-size: 2rem; font-weight: 800; margin-bottom: 12px; }
.affiliate-content p { color: var(--text-secondary); margin-bottom: 24px; }
.affiliate-rates {
  display: flex; gap: 16px; margin-bottom: 16px; flex-wrap: wrap;
}
.rate {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 12px 20px; text-align: center; min-width: 70px;
}
.rate-pct { display: block; font-size: 1.5rem; font-weight: 900; color: var(--accent); }
.rate span:last-child { font-size: 0.75rem; color: var(--text-muted); }
.affiliate-example { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 20px; }
.affiliate-example strong { color: var(--accent); }
.leaderboard {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
}
.leaderboard h4 { margin-bottom: 16px; font-size: 1rem; }
.lb-entry {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 0.88rem;
}
.lb-entry:last-child { border-bottom: none; }
.lb-rank { font-weight: 700; margin-right: 8px; }
.lb-earnings { color: var(--accent); font-weight: 600; font-family: 'JetBrains Mono', monospace; }
.lb-loading { color: var(--text-muted); font-size: 0.9rem; text-align: center; padding: 20px; }

/* ─── Chat ─────────────────────────────────────────── */
.chat-container {
  max-width: 720px; margin: 0 auto;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; height: 500px; display: flex; flex-direction: column;
}
.chat-messages { flex: 1; overflow-y: auto; padding: 24px; display: flex; flex-direction: column; gap: 16px; }
.chat-welcome { text-align: center; padding: 40px 20px; }
.chat-welcome-icon { font-size: 3rem; margin-bottom: 16px; }
.chat-welcome h3 { font-size: 1.2rem; margin-bottom: 8px; }
.chat-welcome p { color: var(--text-secondary); margin-bottom: 20px; }
.chat-suggestions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.chat-suggestions button {
  background: var(--bg-secondary); border: 1px solid var(--border);
  color: var(--text-secondary); padding: 6px 14px; border-radius: 20px;
  font-size: 0.8rem; cursor: pointer; transition: all 0.2s;
}
.chat-suggestions button:hover { border-color: var(--accent); color: var(--accent); }
.chat-msg { max-width: 80%; }
.chat-msg.user { align-self: flex-end; }
.chat-msg.assistant { align-self: flex-start; }
.msg-bubble {
  padding: 12px 16px; border-radius: var(--radius);
  font-size: 0.92rem; line-height: 1.6; white-space: pre-wrap; word-break: break-word;
}
.chat-msg.user .msg-bubble { background: var(--accent); color: #000; border-bottom-right-radius: 4px; }
.chat-msg.assistant .msg-bubble { background: var(--bg-secondary); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.chat-input-area {
  border-top: 1px solid var(--border); padding: 16px; background: var(--bg-secondary);
}
.chat-login-prompt {
  display: flex; align-items: center; justify-content: center; gap: 12px;
  color: var(--text-secondary); font-size: 0.9rem;
}
.chat-input-wrapper { display: flex; gap: 8px; }
.chat-input-wrapper input {
  flex: 1; background: var(--bg-primary); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 10px 14px;
  color: var(--text-primary); font-size: 0.92rem; outline: none;
  transition: border-color 0.2s;
}
.chat-input-wrapper input:focus { border-color: var(--accent); }
.chat-send {
  background: var(--accent); border: none; color: #000;
  width: 40px; height: 40px; border-radius: var(--radius-sm);
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: all 0.2s; flex-shrink: 0;
}
.chat-send:hover { background: var(--accent-light); }

/* ─── Footer ───────────────────────────────────────── */
.footer { background: var(--bg-secondary); border-top: 1px solid var(--border); padding: 60px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; margin: 12px 0; }
.footer-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.tag { background: var(--bg-card); border: 1px solid var(--border); padding: 4px 10px; border-radius: 20px; font-size: 0.75rem; color: var(--text-muted); }
.footer-links h4 { font-size: 0.9rem; margin-bottom: 16px; color: var(--text-primary); }
.footer-links a { display: block; color: var(--text-secondary); font-size: 0.88rem; margin-bottom: 10px; transition: color 0.2s; }
.footer-links a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid var(--border); padding-top: 20px; }
.footer-bottom p { color: var(--text-muted); font-size: 0.8rem; }
.footer-warning { margin-top: 8px; color: var(--red) !important; }

/* ─── Modals ───────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px); z-index: 200; display: none;
}
.modal-overlay.active { display: block; }
.modal {
  position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%);
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px; z-index: 201;
  width: 420px; max-width: calc(100vw - 32px); max-height: 90vh; overflow-y: auto;
  display: none;
}
.modal.active { display: block; }
.modal-lg { width: 560px; }
.modal-xl { width: 820px; }
.modal-header {
  display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px;
}
.modal-header h2 { font-size: 1.3rem; font-weight: 700; }
.modal-close {
  background: none; border: none; color: var(--text-muted);
  font-size: 1.5rem; cursor: pointer; line-height: 1; padding: 4px;
}
.modal-close:hover { color: var(--text-primary); }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 6px; }
.form-group input {
  width: 100%; background: var(--bg-primary); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 10px 14px;
  color: var(--text-primary); font-size: 0.95rem; outline: none;
  transition: border-color 0.2s;
}
.form-group input:focus { border-color: var(--accent); }
.form-error {
  background: var(--red-dim); border: 1px solid var(--red);
  border-radius: var(--radius-sm); padding: 10px 14px;
  color: var(--red); font-size: 0.88rem; margin-bottom: 12px;
}
.modal-footer-text { text-align: center; font-size: 0.88rem; color: var(--text-secondary); margin-top: 16px; }
.modal-footer-text a { color: var(--accent); }

/* Order modal specific */
.order-product-info { background: var(--bg-secondary); border-radius: var(--radius-sm); padding: 16px; margin-bottom: 20px; }
.order-product-name { font-weight: 700; font-size: 1.1rem; margin-bottom: 4px; }
.order-product-price { color: var(--accent); font-size: 1.5rem; font-weight: 900; }
.order-address-box { background: var(--bg-primary); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px; margin-bottom: 16px; }
.order-address-label { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 6px; }
.order-address { font-family: 'JetBrains Mono', monospace; font-size: 0.8rem; word-break: break-all; color: var(--accent); }
.order-qr { text-align: center; margin: 16px 0; }
.order-qr canvas { border-radius: var(--radius-sm); }
.order-copy-btn {
  background: var(--bg-secondary); border: 1px solid var(--border);
  color: var(--text-primary); padding: 6px 14px; border-radius: var(--radius-sm);
  font-size: 0.85rem; cursor: pointer; width: 100%; transition: all 0.2s;
}
.order-copy-btn:hover { border-color: var(--accent); }
.order-status { text-align: center; padding: 20px; }
.order-status-icon { font-size: 2rem; margin-bottom: 8px; }

/* Affiliate panel */
.affiliate-ref-url {
  background: var(--bg-primary); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 10px 14px;
  font-family: 'JetBrains Mono', monospace; font-size: 0.8rem;
  color: var(--accent); word-break: break-all; margin-bottom: 16px;
}
.affiliate-stats-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 20px;
}
.af-stat {
  background: var(--bg-secondary); border-radius: var(--radius-sm); padding: 16px; text-align: center;
}
.af-stat-num { font-size: 1.3rem; font-weight: 800; color: var(--accent); }
.af-stat-label { font-size: 0.75rem; color: var(--text-muted); margin-top: 4px; }
.affiliate-tier-bar {
  display: flex; gap: 4px; margin-bottom: 16px;
}
.tier-segment {
  flex: 1; text-align: center; padding: 6px; font-size: 0.7rem;
  border-radius: 4px; background: var(--bg-secondary); color: var(--text-muted);
}
.tier-segment.active { background: var(--accent); color: #000; font-weight: 700; }

/* ─── Toast ────────────────────────────────────────── */
.toast {
  position: fixed; bottom: 24px; right: 24px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 12px 20px;
  font-size: 0.9rem; z-index: 300; display: none;
  box-shadow: var(--shadow);
}
.toast.show { display: block; animation: slideIn 0.3s ease; }
@keyframes slideIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ─── Order button states ───────────────────────────── */
.btn-loading { opacity: 0.7; pointer-events: none; }

/* ─── Loading spinner ───────────────────────────────── */
.spinner {
  width: 20px; height: 20px; border: 2px solid transparent;
  border-top-color: currentColor; border-radius: 50%;
  animation: spin 0.6s linear infinite; display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── Responsive ────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-actions .btn-ghost { display: none; }
  .nav-mobile-toggle { display: block; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: 64px; left: 0; right: 0;
    background: var(--bg-primary); border-bottom: 1px solid var(--border);
    padding: 16px; gap: 12px;
  }
  .section { padding: 60px 0; }
  .section-title { font-size: 1.8rem; }
  .steps { flex-direction: column; }
  .step-arrow { transform: rotate(90deg); }
  .features-grid { grid-template-columns: 1fr; }
  .courses-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .affiliate-inner { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-stats { flex-wrap: wrap; }
  .chat-container { height: 450px; }
  .modal { padding: 24px; }
  .affiliate-stats-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: center; }
  .payment-methods { flex-direction: column; }
}