/*
 * Serene Interactive — Design Tokens
 * Shared across: main site, Labs, Hub
 * Version: 2.0
 */

/* ─── CSS Variables ─────────────────────────────────── */
:root {
  /* Colors */
  --serene-green: #3d8b6f;
  --serene-green-rgb: 61, 139, 111;
  --serene-blue: #5b8cb5;
  --serene-blue-rgb: 91, 140, 181;
  --serene-text: #1a2e28;
  --serene-text-rgb: 26, 46, 40;
  --serene-muted: #5a7369;
  --serene-muted-rgb: 90, 115, 105;
  --serene-hover: #2e7d6b;
  --serene-soft: #eef4f1;
  --serene-white: #ffffff;

  /* Semantic */
  --serene-success: #3d8b6f;
  --serene-warning: #e8a04a;
  --serene-error: #d94f4f;
  --serene-info: #5b8cb5;

  /* Glass */
  --glass-bg: rgba(255, 255, 255, 0.75);
  --glass-bg-heavy: rgba(255, 255, 255, 0.85);
  --glass-bg-light: rgba(255, 255, 255, 0.6);
  --glass-blur: blur(16px);
  --glass-border: rgba(255, 255, 255, 0.5);
  --glass-border-subtle: rgba(61, 139, 111, 0.15);

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Inter Tight', 'Inter', system-ui, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, monospace;

  /* Font Sizes */
  --text-xs: 0.7rem;
  --text-sm: 0.8rem;
  --text-base: 0.95rem;
  --text-md: 1rem;
  --text-lg: 1.15rem;
  --text-xl: 1.35rem;
  --text-2xl: 1.6rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3.25rem;

  /* Font Weights */
  --weight-light: 300;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;
  --weight-extrabold: 800;
  --weight-black: 900;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  --radius-2xl: 24px;
  --radius-pill: 50px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 40px -8px rgba(0, 0, 0, 0.12);
  --shadow-green: 0 10px 25px -5px rgba(61, 139, 111, 0.2);
  --shadow-green-lg: 0 15px 30px -5px rgba(61, 139, 111, 0.3);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  --transition-spring: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-Index Scale */
  --z-base: 1;
  --z-dropdown: 10;
  --z-sticky: 20;
  --z-overlay: 30;
  --z-modal: 40;
  --z-toast: 50;
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--serene-text);
  line-height: 1.6;
  background: #f8faf9;
  min-height: 100vh;
}

/* ─── Selection ─────────────────────────────────────── */
::selection {
  background: var(--serene-green);
  color: var(--serene-white);
}

/* ─── Glass Components ──────────────────────────────── */
.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
}

.glass-panel-heavy {
  background: var(--glass-bg-heavy);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
}

.glass-panel-light {
  background: var(--glass-bg-light);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.glass-rail {
  background: var(--glass-bg-light);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.4);
}

/* ─── Background Mesh ───────────────────────────────── */
.bg-mesh {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  opacity: 0.4;
  pointer-events: none;
  background-image:
    radial-gradient(at 80% 0%, hsla(158, 40%, 40%, 0.12) 0px, transparent 50%),
    radial-gradient(at 0% 60%, hsla(207, 35%, 53%, 0.08) 0px, transparent 50%);
}

/* ─── Text Utilities ────────────────────────────────── */
.text-gradient {
  background: linear-gradient(135deg, var(--serene-green), var(--serene-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-green { color: var(--serene-green); }
.text-blue { color: var(--serene-blue); }
.text-muted { color: var(--serene-muted); }
.text-center { text-align: center; }

.font-sans { font-family: var(--font-sans); }
.font-display { font-family: var(--font-display); }
.font-mono { font-family: var(--font-mono); }

/* ─── Buttons ───────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  line-height: 1;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--serene-green);
  color: var(--serene-white);
  box-shadow: var(--shadow-green);
}

.btn-primary:hover {
  background: var(--serene-hover);
  box-shadow: var(--shadow-green-lg);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--serene-green);
  border: 1.5px solid var(--serene-green);
}

.btn-secondary:hover {
  background: rgba(61, 139, 111, 0.06);
  border-color: var(--serene-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--serene-text);
}

.btn-ghost:hover {
  background: rgba(0, 0, 0, 0.04);
}

.btn-google {
  background: var(--serene-white);
  color: var(--serene-text);
  border: 1px solid rgba(0, 0, 0, 0.12);
  box-shadow: var(--shadow-sm);
}

.btn-google:hover {
  background: #f9fafb;
  box-shadow: var(--shadow-md);
}

.btn-github {
  background: #24292e;
  color: var(--serene-white);
}

.btn-github:hover {
  background: #1a1e22;
}

.btn-discord {
  background: #5865F2;
  color: var(--serene-white);
}

.btn-discord:hover {
  background: #4752C4;
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
  border-radius: var(--radius-xl);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-md);
}

/* ─── Cards ─────────────────────────────────────────── */
.card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
}

.card-elevated {
  background: var(--glass-bg-heavy);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-lg);
}

/* ─── Badges ────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px 8px;
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
}

.badge-green {
  background: rgba(61, 139, 111, 0.1);
  color: var(--serene-green);
  border: 1px solid rgba(61, 139, 111, 0.2);
}

.badge-blue {
  background: rgba(91, 140, 181, 0.1);
  color: var(--serene-blue);
  border: 1px solid rgba(91, 140, 181, 0.2);
}

.badge-amber {
  background: rgba(232, 160, 74, 0.1);
  color: var(--serene-warning);
  border: 1px solid rgba(232, 160, 74, 0.2);
}

.badge-live {
  background: rgba(61, 139, 111, 0.1);
  color: var(--serene-green);
}

.badge-live::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--serene-green);
  animation: pulse-dot 2s ease-in-out infinite;
}

/* ─── Status Indicator ──────────────────────────────── */
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--serene-green);
  box-shadow: 0 0 8px rgba(61, 139, 111, 0.5);
}

.status-dot-pulse {
  position: relative;
}

.status-dot-pulse::before {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: var(--serene-green);
  animation: ping 1.5s cubic-bezier(0, 0, 0.2, 1) infinite;
  opacity: 0.5;
}

/* ─── Modals ────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(26, 46, 40, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
  padding: var(--space-4);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background: var(--serene-white);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(255, 255, 255, 0.8);
  width: 100%;
  max-width: 420px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(12px) scale(0.97);
  transition: transform var(--transition-slow);
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

.modal-header {
  padding: var(--space-6) var(--space-6) 0;
  text-align: center;
}

.modal-body {
  padding: var(--space-5) var(--space-6);
}

.modal-footer {
  padding: 0 var(--space-6) var(--space-6);
}

.modal-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  border: none;
  background: transparent;
  color: var(--serene-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: rgba(0, 0, 0, 0.05);
  color: var(--serene-text);
}

/* ─── Navigation ────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ─── Dividers ──────────────────────────────────────── */
.divider {
  height: 1px;
  background: rgba(61, 139, 111, 0.1);
  margin: var(--space-6) 0;
}

/* ─── Sections ──────────────────────────────────────── */
.section-label {
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--serene-muted);
  margin-bottom: var(--space-3);
}

/* ─── Animations ────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes ping {
  75%, 100% {
    transform: scale(2);
    opacity: 0;
  }
}

@keyframes pulse-dot {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.6;
    transform: scale(0.8);
  }
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

@keyframes glow {
  0% {
    box-shadow: 0 0 20px rgba(61, 139, 111, 0.2);
  }
  100% {
    box-shadow: 0 0 40px rgba(61, 139, 111, 0.4);
  }
}

/* Animation utilities */
.animate-fade-in { animation: fadeIn 0.4s ease-out; }
.animate-slide-up { animation: slideUp 0.4s ease-out; }
.animate-slide-down { animation: slideDown 0.3s ease-out; }
.animate-scale-in { animation: scaleIn 0.3s ease-out; }
.animate-float { animation: float 6s ease-in-out infinite; }
.animate-glow { animation: glow 4s ease-in-out infinite alternate; }

/* Stagger delays */
.delay-1 { animation-delay: 0.05s; animation-fill-mode: both; }
.delay-2 { animation-delay: 0.1s; animation-fill-mode: both; }
.delay-3 { animation-delay: 0.15s; animation-fill-mode: both; }
.delay-4 { animation-delay: 0.2s; animation-fill-mode: both; }
.delay-5 { animation-delay: 0.25s; animation-fill-mode: both; }

/* ─── Scrollbar ─────────────────────────────────────── */
.scrollbar-thin {
  scrollbar-width: thin;
  scrollbar-color: rgba(61, 139, 111, 0.2) transparent;
}

.scrollbar-thin::-webkit-scrollbar {
  width: 6px;
}

.scrollbar-thin::-webkit-scrollbar-track {
  background: transparent;
}

.scrollbar-thin::-webkit-scrollbar-thumb {
  background: rgba(61, 139, 111, 0.2);
  border-radius: 3px;
}

.scrollbar-thin::-webkit-scrollbar-thumb:hover {
  background: rgba(61, 139, 111, 0.35);
}

/* ─── Responsive ────────────────────────────────────── */
@media (max-width: 768px) {
  :root {
    --text-3xl: 1.75rem;
    --text-4xl: 2rem;
    --text-5xl: 2.5rem;
    --space-6: 20px;
    --space-8: 28px;
    --space-10: 36px;
  }
}