:root {
  --bg-primary: #090b10;
  --bg-secondary: #111520;
  --bg-surface: rgba(22, 27, 41, 0.65);
  --bg-surface-hover: rgba(30, 37, 56, 0.85);
  --bg-glass: rgba(15, 19, 30, 0.78);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text-primary: #f3f5f9;
  --text-secondary: #9aa4b8;
  --text-muted: #647087;
  --accent: #4f7cff;
  --accent-hover: #3b68eb;
  --accent-glow: rgba(79, 124, 255, 0.22);
  --shadow-card: 0 12px 32px rgba(0, 0, 0, 0.35);
  --shadow-modal: 0 24px 64px rgba(0, 0, 0, 0.55);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --transition: 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
  --bg-primary: #f7f9fc;
  --bg-secondary: #eef2f8;
  --bg-surface: rgba(255, 255, 255, 0.82);
  --bg-surface-hover: rgba(255, 255, 255, 0.96);
  --bg-glass: rgba(255, 255, 255, 0.85);
  --border-subtle: rgba(15, 23, 42, 0.08);
  --border-strong: rgba(15, 23, 42, 0.15);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-glow: rgba(37, 99, 235, 0.15);
  --shadow-card: 0 10px 28px rgba(15, 23, 42, 0.06);
  --shadow-modal: 0 24px 60px rgba(15, 23, 42, 0.16);
}

*,
*::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', Roboto, Oxygen, Ubuntu, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
  background-image:
    radial-gradient(circle at 18% 12%, var(--accent-glow), transparent 36%),
    radial-gradient(circle at 82% 8%, rgba(99, 102, 241, 0.1), transparent 32%);
}

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

button,
input {
  font-family: inherit;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-bar {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), #6366f1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 14px var(--accent-glow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.icon-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
}

.icon-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
  background: var(--bg-surface-hover);
}

.mobile-toggle {
  display: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-lg {
  padding: 13px 26px;
  font-size: 1rem;
}

.btn-primary {
  background: var(--accent);
  color: #ffffff;
  box-shadow: 0 4px 18px var(--accent-glow);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-outline {
  background: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.btn-outline:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-strong);
}

/* Main Content */
main {
  flex: 1;
}

/* Hero Section */
.hero {
  padding: 104px 0 84px;
  text-align: center;
}

.hero-inner {
  max-width: 720px;
  margin: 0 auto;
}

.hero h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero p {
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* Pillars Section */
.section {
  padding: 64px 0 96px;
}

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

.section-header h2 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 12px;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  background: var(--bg-surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 30px 28px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  background: var(--bg-surface-hover);
}

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--accent-glow);
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin-bottom: 10px;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 28px 0;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.5);
}

/* Glassmorphic Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(5, 8, 15, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}

.modal-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

.modal-dialog {
  width: 100%;
  max-width: 440px;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-modal);
  transform: translateY(12px) scale(0.98);
  transition: transform var(--transition);
}

.modal-backdrop.is-open .modal-dialog {
  transform: translateY(0) scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.modal-header h3 {
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.modal-body p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.9375rem;
  outline: none;
  transition: border-color var(--transition);
}

.form-input:focus {
  border-color: var(--accent);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 22px;
}

/* Glassmorphic Toast Notifications */
.toast-stack {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 360px;
}

.toast {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--bg-glass);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  color: var(--text-primary);
  font-size: 0.9rem;
  animation: toastIn 0.25s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.toast-icon {
  color: var(--accent);
  flex-shrink: 0;
  display: inline-flex;
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive */
@media (max-width: 860px) {
  .card-grid {
    grid-template-columns: 1fr;
  }

  .mobile-toggle {
    display: inline-flex;
  }

  .nav-links {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--border-subtle);
    padding: 8px 24px 16px;
    display: none;
  }

  .nav-links.is-open {
    display: flex;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: 10px 0;
  }

  .hero {
    padding: 76px 0 56px;
  }
}