/* ============================================
   TradeBrain Marketing — Design System
   Pure CSS, no frameworks
   ============================================ */

/* --- CSS Variables --- */
:root {
  --blue: #2563EB;
  --navy: #1E3A6E;
  --dark-text: #1E293B;
  --body-text: #475569;
  --muted: #94A3B8;
  --bg: #F1F5F9;
  --white: #FFFFFF;
  --border: #E2E8F0;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  line-height: 1.7;
  color: var(--body-text);
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-weight: 700;
  color: var(--dark-text);
}

h1 { font-size: 42px; }
h2 { font-size: 32px; }
h3 { font-size: 22px; }
h4 { font-size: 18px; }

/* --- Layout --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 48px;
}

/* ============================================
   NAVBAR
   ============================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--border);
}

.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.navbar-links {
  display: flex;
  gap: 32px;
  list-style: none;
  padding: 0;
}

.navbar-links a {
  color: var(--body-text);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s;
}

.navbar-links a:hover {
  color: var(--blue);
}

.navbar-cta {
  background: var(--blue);
  color: var(--white);
  padding: 10px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
}

.navbar-cta:hover {
  background: #1d4ed8;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--dark-text);
  border-radius: 2px;
  transition: all 0.3s;
}

.hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
}

.hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile menu */
.mobile-menu {
  display: none;
  flex-direction: column;
  padding: 0 24px 24px;
  gap: 16px;
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  color: var(--body-text);
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

.mobile-menu a:last-child {
  color: var(--blue);
  font-weight: 600;
  border-bottom: none;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--navy);
  color: #93c5fd;
  padding: 48px 0 32px;
  font-size: 11px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 32px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--white);
  text-decoration: none;
  font-size: 14px;
}

.footer-links a:hover {
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 24px;
  font-size: 11px;
  display: flex;
  justify-content: space-between;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn-primary {
  background: var(--blue);
  color: var(--white);
  padding: 12px 32px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 15px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}

.btn-primary:hover {
  background: #1d4ed8;
}

.btn-outline {
  background: transparent;
  color: var(--blue);
  border: 2px solid var(--blue);
  padding: 10px 30px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  margin-left: 12px;
}

.btn-outline:hover {
  background: var(--blue);
  color: var(--white);
}

/* ============================================
   CARDS
   ============================================ */
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
}

.card-blue-top {
  border-top: 3px solid var(--blue);
}

/* ============================================
   HERO
   ============================================ */
.hero {
  text-align: center;
  padding: 80px 24px 40px;
}

.hero-inner {
  max-width: 700px;
  margin: 0 auto;
}

.hero-tagline {
  font-size: 18px;
  color: var(--body-text);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ============================================
   3D COVERFLOW CAROUSEL
   ============================================ */
.carousel-container {
  position: relative;
  width: 100%;
  height: 380px;
  perspective: 1200px;
  overflow: hidden;
  cursor: grab;
  display: flex;
  align-items: center;
  justify-content: center;
}

.c-card {
  position: absolute;
  width: 280px;
  height: 340px;
  transform-style: preserve-3d;
  backface-visibility: hidden;
  will-change: transform, opacity;
  pointer-events: auto;
  cursor: pointer;
}

.c-face {
  width: 100%;
  height: 100%;
  background: var(--white);
  border: 1px solid var(--border);
  border-top: 3px solid var(--blue);
  border-radius: 12px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

.c-card.center .c-face {
  box-shadow: 0 8px 40px rgba(37, 99, 235, 0.15);
}

.c-icon {
  width: 44px;
  height: 44px;
  background: #eff6ff;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--blue);
}

.c-icon svg {
  width: 22px;
  height: 22px;
}

.c-subtitle {
  font-size: 12px;
  color: var(--blue);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
  margin-bottom: 6px;
}

.c-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--dark-text);
  margin-bottom: 10px;
}

.c-desc {
  font-size: 13px;
  color: var(--body-text);
  line-height: 1.6;
  flex: 1;
}

.c-link {
  font-size: 13px;
  color: var(--blue);
  font-weight: 600;
  margin-top: 12px;
  cursor: pointer;
}

.c-link:hover {
  text-decoration: underline;
}

/* Carousel dots */
.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
}

.c-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: transparent;
  cursor: pointer;
  padding: 0;
  transition: all 0.3s;
}

.c-dot.active {
  background: var(--blue);
  border-color: var(--blue);
}

/* ============================================
   STATS BAR
   ============================================ */
.stats-bar {
  display: flex;
  justify-content: center;
  gap: 64px;
  padding: 48px 24px;
  background: var(--white);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.stat {
  text-align: center;
}

.stat-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--blue);
}

.stat-label {
  font-size: 13px;
  color: var(--muted);
  margin-top: 4px;
}

/* ============================================
   FEATURE GRID
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  text-align: left;
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: #eff6ff;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--body-text);
}

/* ============================================
   PRICING
   ============================================ */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.pricing-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  position: relative;
}

.pricing-card.popular {
  border: 2px solid var(--blue);
}

.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--blue);
  color: var(--white);
  font-size: 11px;
  padding: 4px 12px;
  border-radius: 8px;
  font-weight: 600;
  white-space: nowrap;
}

.price {
  font-size: 36px;
  font-weight: 700;
  color: var(--dark-text);
}

.price-period {
  font-size: 14px;
  color: var(--muted);
}

.tier-name {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.pricing-features {
  list-style: none;
  padding: 0;
}

.pricing-features li {
  font-size: 13px;
  padding: 4px 0;
  color: var(--body-text);
}

.pricing-features .check {
  color: #10b981;
}

/* ============================================
   TOGGLE
   ============================================ */
.toggle-wrap {
  display: inline-flex;
  background: var(--bg);
  border-radius: 8px;
  padding: 3px;
}

.toggle-btn {
  padding: 8px 20px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  background: transparent;
  font-family: inherit;
}

.toggle-btn.active {
  background: var(--white);
  color: var(--dark-text);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* ============================================
   COMPARISON TABLE
   ============================================ */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.comparison-table th {
  background: var(--white);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  color: var(--dark-text);
  border-bottom: 2px solid var(--border);
}

.comparison-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.check-mark {
  color: #10b981;
  font-weight: 700;
}

.x-mark {
  color: #ef4444;
  font-weight: 700;
}

/* ============================================
   CONTACT FORM
   ============================================ */
.contact-form .form-group {
  margin-bottom: 20px;
}

.contact-form label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--dark-text);
  margin-bottom: 6px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  color: var(--dark-text);
  font-family: inherit;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--blue);
  outline: none;
}

.contact-form textarea {
  min-height: 120px;
  resize: vertical;
}

/* ============================================
   RESPONSIVE — Tablet
   ============================================ */
@media (max-width: 1200px) {
  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================
   RESPONSIVE — Mobile
   ============================================ */
@media (max-width: 768px) {
  .navbar-links,
  .navbar-cta {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  .stats-bar {
    flex-wrap: wrap;
    gap: 32px;
  }

  .footer-top {
    flex-direction: column;
    gap: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .carousel-container {
    height: 320px;
  }

  .c-card {
    width: 240px;
    height: 300px;
  }

  h1 { font-size: 28px; }
  h2 { font-size: 24px; }
}