/* ===========================
   ITCN 2026 — Big-Screen Showcase
   Core Design System & Base Styles
   =========================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800;900&display=swap');

:root {
  /* ---- Base Palette ---- */
  --bg-primary: #06080f;
  --bg-secondary: #0d1121;
  --bg-surface: rgba(15, 20, 40, 0.6);
  --bg-glass: rgba(255, 255, 255, 0.04);
  --bg-glass-hover: rgba(255, 255, 255, 0.08);

  --text-primary: #f0f2f8;
  --text-secondary: rgba(240, 242, 248, 0.6);
  --text-muted: rgba(240, 242, 248, 0.35);

  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(255, 255, 255, 0.12);

  /* Active brand accent (updated dynamically per project) */
  --accent: #00d4ff;
  --accent-rgb: 0, 212, 255;
  --accent-glow: rgba(var(--accent-rgb), 0.3);
  --accent-soft: rgba(var(--accent-rgb), 0.1);

  /* ---- 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;

  /* ---- Typography ---- */
  --font-display: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.25rem;
  --text-xl: 1.5rem;
  --text-2xl: 2rem;
  --text-3xl: 2.5rem;
  --text-4xl: 3.5rem;
  --text-5xl: 4.5rem;

  /* ---- Border Radius ---- */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* ---- Easings & Transitions ---- */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  --transition-fast: 200ms var(--ease-out-expo);
  --transition-normal: 400ms var(--ease-out-expo);
  --transition-slow: 700ms var(--ease-out-expo);
  --transition-cinematic: 1200ms var(--ease-out-quart);

  /* ---- Z-Index Layers ---- */
  --z-ambient: 0;
  --z-stage: 10;
  --z-hud: 20;
  --z-dock: 30;
  --z-matrix: 40;
  --z-controls: 50;
  --z-header: 60;
  --z-splash: 200;
  --z-overlay: 100;
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  cursor: none;
}

/* Show cursor on interactive elements */
button, a, .dock-item, .matrix-cell, .control-btn, .interactive {
  cursor: pointer;
}

#app {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

/* ===== Typography Utilities ===== */
.font-display {
  font-family: var(--font-display);
}

.text-gradient {
  background: linear-gradient(135deg, var(--accent), rgba(var(--accent-rgb), 0.6));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== Glassmorphism Utilities ===== */
.glass {
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(1.5);
  -webkit-backdrop-filter: blur(20px) saturate(1.5);
  border: 1px solid var(--border-glass);
}

.glass-strong {
  background: rgba(10, 14, 30, 0.7);
  backdrop-filter: blur(40px) saturate(1.8);
  -webkit-backdrop-filter: blur(40px) saturate(1.8);
  border: 1px solid var(--border-glow);
}

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

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-40px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(40px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.92); }
  to   { opacity: 1; transform: scale(1); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.45; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-10px); }
}

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

@keyframes glow-pulse {
  0%, 100% {
    box-shadow:
      0 0 20px rgba(var(--accent-rgb), 0.15),
      0 0 60px rgba(var(--accent-rgb), 0.06);
  }
  50% {
    box-shadow:
      0 0 30px rgba(var(--accent-rgb), 0.35),
      0 0 90px rgba(var(--accent-rgb), 0.14);
  }
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* ===== Splash / Loading Screen ===== */
#splash-screen {
  position: fixed;
  inset: 0;
  z-index: var(--z-splash);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  transition: opacity 1s ease, visibility 0s 1s;
}

#splash-screen.hidden {
  opacity: 0;
  visibility: hidden;
}

.splash-content {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.splash-brand {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 900;
  letter-spacing: 0.06em;
  background: linear-gradient(135deg, #00d4ff 0%, #a855f7 50%, #f97316 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.splash-sub {
  font-size: var(--text-sm);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

.splash-loader {
  width: 48px;
  height: 48px;
  border: 2px solid var(--border-glass);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: rotate 0.8s linear infinite;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar       { width: 4px; }
::-webkit-scrollbar-track  { background: transparent; }
::-webkit-scrollbar-thumb  { background: rgba(255,255,255,0.1); border-radius: var(--radius-full); }

/* ===== Selection ===== */
::selection {
  background: rgba(var(--accent-rgb), 0.3);
  color: var(--text-primary);
}

/* ===== Hidden Utility ===== */
.hidden { display: none !important; }