/* ============================================================
   SirenUA.online — Design System
   Dark Military-Tech Glassmorphism
   ============================================================ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ── CSS Custom Properties ── */
:root {
  /* ─ Core Palette ─ */
  --bg-primary: #06080f;
  --bg-secondary: #0a0e1a;
  --bg-tertiary: #0d1526;
  --bg-card: rgba(13, 21, 38, 0.7);
  --bg-card-hover: rgba(18, 30, 52, 0.85);
  --bg-glass: rgba(15, 23, 42, 0.5);
  --bg-glass-strong: rgba(15, 23, 42, 0.8);

  /* ─ Accent Colors (Electric Neon Cyan Palette) ─ */
  --cyan: #00e5ff;
  --cyan-light: #38bdf8;
  --cyan-dim: rgba(0, 229, 255, 0.15);
  --cyan-glow: rgba(0, 229, 255, 0.35);
  --blue: #3b82f6;
  --blue-dim: rgba(59, 130, 246, 0.15);
  --amber: #f59e0b;
  --amber-dim: rgba(245, 158, 11, 0.15);
  --red: #ef4444;
  --red-dim: rgba(239, 68, 68, 0.15);
  --green: #00e5ff;
  --green-dim: rgba(0, 229, 255, 0.15);

  /* ─ Text ─ */
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-accent: var(--cyan);

  /* ─ Borders ─ */
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glass-hover: rgba(0, 229, 255, 0.35);
  --border-accent: rgba(0, 229, 255, 0.45);

  /* ─ Gradients (Pure High-Tech Cyan Glow) ─ */
  --gradient-hero: linear-gradient(135deg, #06080f 0%, #0d1526 40%, #0f172a 100%);
  --gradient-accent: linear-gradient(135deg, #00e5ff 0%, #0284c7 100%);
  --gradient-accent-soft: linear-gradient(135deg, rgba(0, 229, 255, 0.15), rgba(2, 132, 199, 0.15));
  --gradient-card: linear-gradient(145deg, rgba(15,23,42,0.6), rgba(10,16,30,0.8));
  --gradient-cta: linear-gradient(135deg, #00e5ff 0%, #0284c7 100%);
  --gradient-amber: linear-gradient(135deg, var(--amber), #d97706);
  --gradient-text: linear-gradient(135deg, #00e5ff 0%, #38bdf8 100%);

  /* ─ Shadows ─ */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.5);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.6);
  --shadow-glow-cyan: 0 0 30px rgba(0, 229, 255, 0.3), 0 0 60px rgba(0, 229, 255, 0.1);
  --shadow-glow-blue: 0 0 30px rgba(59,130,246,0.15);

  /* ─ Glass Effect ─ */
  --glass-blur: blur(20px);
  --glass-blur-heavy: blur(40px);

  /* ─ Typography ─ */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

  /* ─ Spacing ─ */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* ─ Border Radius ─ */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* ─ Transitions ─ */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* ─ Layout ─ */
  --container-max: 1280px;
  --container-narrow: 900px;
  --nav-height: 72px;

  /* ─ Z-index ─ */
  --z-behind: -1;
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-nav: 500;
  --z-modal: 1000;
  --z-chat: 1100;
  --z-tooltip: 1200;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 1.05rem;
}

a {
  color: var(--cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

strong { font-weight: 600; color: var(--text-primary); }

.text-gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-accent { color: var(--cyan); }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-center { text-align: center; }
.text-mono { font-family: var(--font-mono); }

.section-subtitle {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--cyan);
  margin-bottom: var(--space-md);
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
}

.section-subtitle::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 2px;
}

.section-description {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ── Layout ── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.container--narrow {
  max-width: var(--container-narrow);
}

section {
  padding: var(--space-5xl) 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-4xl);
}

/* ── Grid ── */
.grid {
  display: grid;
  gap: var(--space-xl);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ── Flex ── */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }

/* ── Navigation ── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: var(--z-nav);
  transition: background var(--transition-base), box-shadow var(--transition-base);
  display: flex;
  align-items: center;
}

.navbar.scrolled {
  background: rgba(6, 8, 15, 0.85);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: 0 1px 0 var(--border-glass), var(--shadow-md);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav-logo-img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  box-shadow: 0 2px 10px rgba(0,0,0,0.4);
  object-fit: cover;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding: var(--space-xs) 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 2px;
  transition: width var(--transition-base);
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Language Switcher */
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  padding: 4px 10px;
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font-mono);
}

.lang-btn {
  color: var(--text-muted);
  text-decoration: none;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.lang-btn::after { display: none !important; }

.lang-btn:hover {
  color: var(--text-primary);
}

.lang-btn.active {
  color: #06080f;
  background: var(--cyan);
  font-weight: 700;
  border-radius: 4px;
}

.lang-divider {
  color: var(--border-glass);
  font-size: 0.75rem;
  user-select: none;
}

.nav-cta {
  padding: 8px 20px !important;
  background: var(--gradient-cta) !important;
  color: #06080f !important;
  border-radius: var(--radius-full) !important;
  font-weight: 600 !important;
  font-size: 0.85rem !important;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast) !important;
}

.nav-cta::after { display: none !important; }

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow-cyan);
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: var(--z-nav);
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100dvh;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: calc(var(--nav-height) + var(--space-xl)) var(--space-xl) var(--space-xl);
    gap: var(--space-md);
    transition: right var(--transition-slow);
    border-left: 1px solid var(--border-glass);
    box-shadow: -10px 0 40px rgba(0,0,0,0.5);
  }

  .nav-links.open { right: 0; }

  .nav-links a {
    font-size: 1.1rem;
    padding: var(--space-sm) 0;
  }
}

/* ── Hero ── */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  overflow: hidden;
  background: var(--gradient-hero);
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 30%, rgba(34,211,238,0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 70% 70%, rgba(59,130,246,0.04) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: var(--z-base);
  text-align: center;
  max-width: 850px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: var(--cyan-dim);
  border: 1px solid rgba(34,211,238,0.2);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--cyan);
  margin-bottom: var(--space-xl);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  animation: pulse-dot 2s ease-in-out infinite;
}

.hero h1 {
  margin-bottom: var(--space-lg);
  font-weight: 900;
}

.hero-subtitle {
  font-size: clamp(0.98rem, 1.35vw, 1.15rem);
  color: var(--text-secondary);
  margin-bottom: var(--space-2xl);
  max-width: 780px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.65;
  text-wrap: balance;
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-3xl);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-3xl);
  flex-wrap: wrap;
}

.hero-stat {
  text-align: center;
}

.hero-stat-value {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  display: block;
}

.hero-stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 4px;
}

/* Hero canvas overlay */
#hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 14px 32px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  font-family: var(--font-sans);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-cta);
  color: var(--bg-primary);
  box-shadow: 0 4px 20px rgba(34,211,238,0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(34,211,238,0.3);
  color: var(--bg-primary);
}

.btn-secondary {
  background: var(--bg-glass);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glass-hover);
  transform: translateY(-2px);
  color: var(--text-primary);
}

.btn-amber {
  background: var(--gradient-amber);
  color: var(--bg-primary);
  box-shadow: 0 4px 20px rgba(245,158,11,0.2);
}

.btn-amber:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(245,158,11,0.3);
  color: var(--bg-primary);
}

.btn-outline {
  background: transparent;
  color: var(--cyan);
  border: 1px solid var(--border-accent);
}

.btn-outline:hover {
  background: var(--cyan-dim);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 20px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 18px 40px;
  font-size: 1.05rem;
}

.btn-icon {
  font-size: 1.2em;
}

/* ── Section Divider ── */
.section-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-glass), var(--border-accent), var(--border-glass), transparent);
  margin: 0;
  border: none;
}

/* ── Footer ── */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-glass);
  padding: var(--space-4xl) 0 var(--space-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: var(--space-md);
  max-width: 300px;
  line-height: 1.7;
}

.footer-column h4 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
}

.footer-column ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-column a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-column a:hover {
  color: var(--cyan);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border-glass);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-socials {
  display: flex;
  gap: var(--space-md);
}

.footer-socials a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  border: 1px solid var(--border-glass);
  transition: all var(--transition-base);
  font-size: 0.9rem;
}

.footer-socials a:hover {
  background: var(--cyan-dim);
  border-color: var(--border-accent);
  color: var(--cyan);
  transform: translateY(-2px);
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }

  .footer-brand { grid-column: span 2; }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand { grid-column: span 1; }
}

/* ── Utility ── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }

/* ── Scrollbar ── */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ── Selection ── */
::selection {
  background: rgba(34, 211, 238, 0.3);
  color: var(--text-primary);
}