/* ==========================================================================
   FELINITY TRADING · Institutional Website Intro Page Stylesheet
   Direction E: Stratified Cadence / 深度阶梯与潜步律动
   ========================================================================== */

@font-face {
  font-family: 'Montserrat';
  src: url('../fonts/Montserrat.ttf') format('truetype');
  font-weight: 100 900;
  font-display: swap;
}

:root {
  /* Default Institutional Crisp Light Theme */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F8FAFC;
  --bg-subtle: rgba(10, 25, 47, 0.025);

  --text-primary: #0A192F;
  --text-secondary: #475569;
  --text-muted: #64748B;
  
  --accent-teal: #1E8E86;
  --accent-teal-glow: rgba(30, 142, 134, 0.12);
  --accent-teal-border: rgba(30, 142, 134, 0.35);
  
  --border-hairline: #E2E8F0;
  --border-hover: rgba(30, 142, 134, 0.45);

  --font-brand: 'Montserrat', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'Adwaita Mono', 'SF Mono', 'JetBrains Mono', Consolas, monospace;

  --transition-smooth: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --max-width: 1240px;
}

/* Dark Mode Overrides */
[data-theme="dark"] {
  --bg-primary: #07111E;
  --bg-secondary: #0A192F;
  --bg-card: #0E2038;
  --bg-card-hover: #122845;
  --bg-subtle: rgba(255, 255, 255, 0.03);

  --text-primary: #FFFFFF;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;

  --accent-teal: #25B2A6;
  --accent-teal-glow: rgba(37, 178, 166, 0.15);
  --accent-teal-border: rgba(37, 178, 166, 0.35);

  --border-hairline: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(37, 178, 166, 0.4);
}

/* Base Reset & Setup */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

body {
  font-family: var(--font-brand);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-smooth);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-hairline);
  transition: var(--transition-smooth);
}

[data-theme="dark"] .site-nav {
  background: rgba(7, 17, 30, 0.88);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 16px;
  text-decoration: none;
  color: var(--text-primary);
  transition: var(--transition-smooth);
}

.nav-logo-mark {
  width: 44px;
  height: 28px;
  color: var(--text-primary);
  flex-shrink: 0;
  transition: var(--transition-smooth);
}

.nav-logo-text {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.nav-brand-title {
  font-size: 23px;
  font-weight: 300;
  letter-spacing: 0.28em;
  margin-right: -0.28em;
  color: var(--text-primary);
  line-height: 1;
}

.nav-brand-sub {
  font-size: 8px;
  font-weight: 500;
  letter-spacing: 0.60em;
  margin-right: -0.60em;
  color: var(--text-muted);
  line-height: 1;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
  margin-left: clamp(70px, 7vw, 110px);
}

.nav-links a {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  text-transform: uppercase;
}

.nav-links a:hover {
  color: var(--accent-teal);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

/* Status Beacon */
.status-beacon {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 20px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--accent-teal);
  letter-spacing: 0.05em;
}

.beacon-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-teal);
  box-shadow: 0 0 10px var(--accent-teal);
  animation: pulse-dot 2s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.theme-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border-hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: var(--transition-smooth);
}

.theme-btn:hover {
  border-color: var(--accent-teal);
  color: var(--accent-teal);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  background: var(--accent-teal);
  color: #FFFFFF;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-radius: 3px;
  transition: var(--transition-smooth);
}

.btn-primary:hover {
  background: #16716A;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--accent-teal-glow);
}

[data-theme="dark"] .btn-primary {
  color: #07111E;
}

[data-theme="dark"] .btn-primary:hover {
  background: #2CD6C7;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-hairline);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-radius: 3px;
  transition: var(--transition-smooth);
}

.btn-secondary:hover {
  border-color: var(--accent-teal);
  color: var(--accent-teal);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  padding-top: 170px;
  padding-bottom: 110px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  grid-gap: 50px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: var(--accent-teal);
  text-transform: uppercase;
  margin-bottom: 24px;
}

.hero-tag::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 1.5px;
  background: var(--accent-teal);
}

.hero-title {
  font-size: 54px;
  font-weight: 300;
  line-height: 1.18;
  letter-spacing: -0.01em;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.hero-title strong {
  font-weight: 500;
  color: var(--accent-teal);
}

.hero-desc {
  font-size: 18px;
  font-weight: 300;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 600px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 40px;
}

.hero-meta-strip {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-top: 28px;
  border-top: 1px solid var(--border-hairline);
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.08em;
}

.hero-meta-item strong {
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

/* Hero Canvas & Microstructure Visualizer */
.hero-visualizer {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: 6px;
  padding: 24px;
  box-shadow: 0 4px 24px rgba(10, 25, 47, 0.05);
  position: relative;
}

[data-theme="dark"] .hero-visualizer {
  box-shadow: 0 10px 40px rgba(0,0,0,0.35);
}

.vis-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-hairline);
  margin-bottom: 20px;
}

.vis-title {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--text-secondary);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 8px;
}

.vis-dot {
  width: 6px;
  height: 6px;
  background: var(--accent-teal);
  border-radius: 50%;
}

.vis-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent-teal);
}

#liquidity-canvas {
  width: 100%;
  height: 280px;
  display: block;
}

.vis-footer {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--border-hairline);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 12px;
}

.vis-stat-val {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.vis-stat-lbl {
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ==========================================================================
   Metrics Strip
   ========================================================================== */
.metrics-strip {
  padding: 50px 0;
  border-top: 1px solid var(--border-hairline);
  border-bottom: 1px solid var(--border-hairline);
  background: var(--bg-subtle);
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-gap: 30px;
}

.metric-item {
  border-left: 2px solid var(--border-hairline);
  padding-left: 24px;
  transition: var(--transition-smooth);
}

.metric-item:hover {
  border-left-color: var(--accent-teal);
}

.metric-number {
  font-size: 38px;
  font-weight: 300;
  color: var(--text-primary);
  font-family: var(--font-mono);
  line-height: 1.1;
  margin-bottom: 8px;
}

.metric-label {
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.metric-sub {
  font-size: 12px;
  color: var(--text-muted);
}

/* ==========================================================================
   Capabilities Section
   ========================================================================== */
.section {
  padding: 100px 0;
}

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 60px auto;
}

.section-tag {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.25em;
  color: var(--accent-teal);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.section-title {
  font-size: 38px;
  font-weight: 300;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 32px;
}

.cap-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: 6px;
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(10, 25, 47, 0.03), 0 4px 16px rgba(10, 25, 47, 0.02);
}

.cap-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: transparent;
  transition: var(--transition-smooth);
}

.cap-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 10px 28px rgba(10, 25, 47, 0.06);
}

.cap-card:hover::before {
  background: var(--accent-teal);
}

.cap-num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent-teal);
  margin-bottom: 24px;
  letter-spacing: 0.1em;
}

.cap-title {
  font-size: 21px;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.35;
}

.cap-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  flex: 1;
}

.cap-features {
  list-style: none;
  border-top: 1px solid var(--border-hairline);
  padding-top: 20px;
}

.cap-features li {
  font-size: 12.5px;
  color: var(--text-muted);
  padding: 6px 0;
  display: flex;
  align-items: center;
  gap: 10px;
}

.cap-features li::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent-teal);
}

/* ==========================================================================
   Architecture & Risk Control
   ========================================================================== */
.arch-box {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: 6px;
  padding: 60px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-gap: 60px;
  align-items: center;
}

.arch-info h3 {
  font-size: 32px;
  font-weight: 300;
  margin-bottom: 20px;
  line-height: 1.3;
}

.arch-info p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 30px;
}

.arch-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.arch-list-item {
  display: flex;
  gap: 16px;
}

.arch-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-teal-glow);
  color: var(--accent-teal);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  flex-shrink: 0;
  margin-top: 2px;
}

.arch-item-text strong {
  display: block;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.arch-item-text span {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Order Book Microstructure Graphic */
.depth-diagram {
  background: var(--bg-secondary);
  border: 1px solid var(--border-hairline);
  border-radius: 6px;
  padding: 30px;
}

.depth-header {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--accent-teal);
  margin-bottom: 20px;
  display: flex;
  justify-content: space-between;
}

.depth-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-hairline);
  font-family: var(--font-mono);
  font-size: 12px;
}

.depth-bar-wrap {
  flex: 1;
  margin: 0 16px;
  height: 6px;
  background: var(--border-hairline);
  border-radius: 3px;
  overflow: hidden;
}

.depth-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.5s ease;
}

.depth-bar-fill.ask { background: #E05263; }
.depth-bar-fill.bid { background: var(--accent-teal); }

/* ==========================================================================
   Corporate Entity Disclosure
   ========================================================================== */
.entity-callout {
  background: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  border-radius: 6px;
  padding: 36px 40px;
  margin-top: 50px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.entity-left {
  display: flex;
  align-items: center;
  gap: 20px;
}

.entity-mark {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
}

.entity-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--accent-teal);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.entity-name {
  font-size: 18px;
  font-weight: 400;
  color: var(--text-primary);
}

.entity-desc {
  font-size: 13px;
  color: var(--text-muted);
  max-width: 460px;
}

/* ==========================================================================
   Contact / Institutional Inquiries
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-gap: 60px;
}

.contact-info h3 {
  font-size: 32px;
  font-weight: 300;
  margin-bottom: 16px;
}

.contact-info p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 32px;
}

.contact-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-card {
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition-smooth);
}

.contact-card:hover {
  border-color: var(--accent-teal);
}

.contact-card-lbl {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}

.contact-card-val {
  font-family: var(--font-mono);
  font-size: 14.5px;
  color: var(--text-primary);
}

/* Contact Form */
.inquiry-form {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: 6px;
  padding: 40px;
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border-hairline);
  border-radius: 4px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 14px;
  transition: var(--transition-smooth);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent-teal);
  box-shadow: 0 0 0 2px var(--accent-teal-glow);
}

.form-textarea {
  resize: vertical;
  min-height: 90px;
}

.form-submit-btn {
  width: 100%;
  padding: 14px;
  background: var(--accent-teal);
  color: #FFFFFF;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border-radius: 4px;
  transition: var(--transition-smooth);
}

.form-submit-btn:hover {
  background: #16716A;
  box-shadow: 0 4px 20px var(--accent-teal-glow);
}

[data-theme="dark"] .form-submit-btn {
  color: #07111E;
}

[data-theme="dark"] .form-submit-btn:hover {
  background: #2CD6C7;
}

.form-feedback {
  margin-top: 14px;
  font-size: 13px;
  text-align: center;
  display: none;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  padding: 70px 0 40px 0;
  border-top: 1px solid var(--border-hairline);
  background: var(--bg-secondary);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 50px;
}

.footer-brand {
  max-width: 380px;
}

.footer-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-top: 14px;
}

.footer-links-group {
  display: flex;
  gap: 60px;
}

.footer-col h4 {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--accent-teal);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  font-size: 13px;
  color: var(--text-secondary);
}

.footer-col a:hover {
  color: var(--accent-teal);
}

.footer-disclaimer {
  padding-top: 30px;
  border-top: 1px solid var(--border-hairline);
  font-size: 11.5px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 24px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
}

/* Responsive adjustments */
@media (max-width: 992px) {
  .hero-grid, .arch-box, .contact-grid {
    grid-template-columns: 1fr;
    grid-gap: 40px;
  }
  .capabilities-grid, .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-title {
    font-size: 42px;
  }
  .entity-callout {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .metrics-grid, .capabilities-grid {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 34px;
  }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .footer-top {
    flex-direction: column;
    gap: 40px;
  }
  .footer-links-group {
    flex-wrap: wrap;
    gap: 30px;
  }
}