/* ==========================================================================
   YNSUPER AWWWARDS-GRADE DESIGN SYSTEM (2026)
   Inspired by Lusion v3, Active Theory & Basement Studio
   Avant-Garde Creative Tech & Interactive Playground
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600;700&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Syne:wght@600;700;800;900&display=swap');

:root {
  /* Default: Obsidian Noir Theme */
  --bg-deep: #05060A;
  --bg-surface: rgba(12, 16, 28, 0.65);
  --bg-surface-hover: rgba(20, 26, 44, 0.85);
  
  --primary: #8B5CF6;
  --primary-rgb: 139, 92, 246;
  --primary-glow: rgba(139, 92, 246, 0.45);
  
  --secondary: #06B6D4;
  --secondary-rgb: 6, 182, 212;
  --secondary-glow: rgba(6, 182, 212, 0.45);
  
  --accent: #EC4899;
  --accent-rgb: 236, 72, 153;
  --accent-glow: rgba(236, 72, 153, 0.45);
  
  --text-main: #FFFFFF;
  --text-muted: #94A3B8;
  --text-dim: #64748B;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(139, 92, 246, 0.6);
  
  --font-display: 'Syne', sans-serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  
  --grad-main: linear-gradient(135deg, #8B5CF6 0%, #06B6D4 50%, #EC4899 100%);
  --grad-rainbow: linear-gradient(115deg, #FF007A, #7928CA, #0070F3, #00DFD8, #FF007A);
}

/* Theme 2: Neon Synthwave */
[data-theme="synthwave"] {
  --bg-deep: #0A0414;
  --bg-surface: rgba(24, 10, 42, 0.65);
  --primary: #EC4899;
  --primary-rgb: 236, 72, 153;
  --primary-glow: rgba(236, 72, 153, 0.55);
  --secondary: #8B5CF6;
  --secondary-rgb: 139, 92, 246;
  --secondary-glow: rgba(139, 92, 246, 0.5);
  --accent: #06B6D4;
  --border-hover: rgba(236, 72, 153, 0.7);
  --grad-main: linear-gradient(135deg, #EC4899 0%, #8B5CF6 50%, #06B6D4 100%);
}

/* Theme 3: Matrix Cyber */
[data-theme="matrix"] {
  --bg-deep: #020804;
  --bg-surface: rgba(6, 24, 14, 0.65);
  --primary: #10B981;
  --primary-rgb: 16, 185, 129;
  --primary-glow: rgba(16, 185, 129, 0.55);
  --secondary: #06B6D4;
  --secondary-rgb: 6, 182, 212;
  --secondary-glow: rgba(6, 182, 212, 0.5);
  --accent: #84CC16;
  --border-hover: rgba(16, 185, 129, 0.7);
  --grad-main: linear-gradient(135deg, #10B981 0%, #06B6D4 50%, #84CC16 100%);
}

/* Theme 4: Solar Flare */
[data-theme="solar"] {
  --bg-deep: #0A0502;
  --bg-surface: rgba(28, 14, 8, 0.65);
  --primary: #F59E0B;
  --primary-rgb: 245, 158, 11;
  --primary-glow: rgba(245, 158, 11, 0.55);
  --secondary: #EF4444;
  --secondary-rgb: 239, 68, 68;
  --secondary-glow: rgba(239, 68, 68, 0.5);
  --accent: #F97316;
  --border-hover: rgba(245, 158, 11, 0.7);
  --grad-main: linear-gradient(135deg, #F59E0B 0%, #EF4444 50%, #F97316 100%);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-deep);
  color: var(--text-main);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-deep);
  color: var(--text-main);
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  transition: background-color 0.5s ease;
}

/* Ambient Cursor Spotlight Glow */
#ambient-spotlight {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 1;
  background: radial-gradient(circle 450px at var(--mouse-x, 50vw) var(--mouse-y, 50vh), rgba(var(--primary-rgb), 0.12), transparent 75%);
  transition: opacity 0.3s;
}

/* Fullscreen Physics Particle Canvas */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: auto;
}

/* Custom Interactive Magnetic Cursor */
.cursor-dot {
  position: fixed;
  top: 0;
  left: 0;
  width: 8px;
  height: 8px;
  background: var(--secondary);
  border-radius: 50%;
  pointer-events: none;
  z-index: 10000;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 16px var(--secondary);
}

.cursor-ring {
  position: fixed;
  top: 0;
  left: 0;
  width: 40px;
  height: 40px;
  border: 1.5px solid var(--primary);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: width 0.25s, height 0.25s, border-color 0.25s;
}

@media (pointer: coarse) {
  .cursor-dot, .cursor-ring {
    display: none !important;
  }
}

/* Container */
.container {
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

/* Typography Helpers */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.gradient-text {
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.scramble-hover {
  cursor: pointer;
  display: inline-block;
  transition: color 0.2s;
}

.scramble-hover:hover {
  color: var(--secondary);
}

/* ==========================================================================
   Top Glass Island Header
   ========================================================================== */
.header-wrapper {
  position: fixed;
  top: 24px;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: center;
  padding: 0 20px;
}

.glass-navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1100px;
  padding: 10px 24px;
  background: rgba(10, 14, 26, 0.72);
  backdrop-filter: blur(28px);
  -webkit-backdrop-filter: blur(28px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition: all 0.3s;
}

.glass-navbar:hover {
  border-color: rgba(255, 255, 255, 0.2);
}

.brand-badge {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: #FFFFFF;
}

.brand-symbol {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--grad-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.1rem;
  box-shadow: 0 0 20px var(--primary-glow);
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* System Live Clock Pill */
.clock-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.live-indicator {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10B981;
  box-shadow: 0 0 10px #10B981;
  animation: pulse-live 2s infinite;
}

@keyframes pulse-live {
  0% { transform: scale(0.9); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.8; }
}

/* Theme Switcher */
.theme-picker {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.05);
  padding: 4px 6px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
}

.theme-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
}

.theme-dot:hover {
  transform: scale(1.25);
}

.theme-dot.active {
  border-color: #FFFFFF;
  transform: scale(1.15);
  box-shadow: 0 0 10px #FFFFFF;
}

.dot-obsidian { background: linear-gradient(135deg, #8B5CF6, #06B6D4); }
.dot-synthwave { background: linear-gradient(135deg, #EC4899, #8B5CF6); }
.dot-matrix { background: linear-gradient(135deg, #10B981, #06B6D4); }
.dot-solar { background: linear-gradient(135deg, #F59E0B, #EF4444); }

/* Audio Toggle Button */
.sound-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}

.sound-btn:hover, .sound-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #FFFFFF;
  box-shadow: 0 0 16px var(--primary-glow);
}

/* ==========================================================================
   Hero Section: Ultra-Impact Editorial Aesthetic
   ========================================================================== */
.hero-section {
  padding-top: 175px;
  padding-bottom: 70px;
  text-align: center;
  position: relative;
}

.tag-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.35);
  color: var(--primary);
  margin-bottom: 28px;
  backdrop-filter: blur(16px);
}

.hero-title {
  font-size: clamp(3rem, 7vw + 0.8rem, 6rem);
  line-height: 1.05;
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: clamp(1.15rem, 1.8vw + 0.3rem, 1.45rem);
  max-width: 720px;
  margin: 0 auto 40px;
  color: #CBD5E1;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.98rem;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-primary {
  background: var(--grad-main);
  color: #FFFFFF;
  box-shadow: 0 10px 30px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 16px 40px var(--primary-glow);
}

.btn-glass {
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  color: #FFFFFF;
}

.btn-glass:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--secondary);
  transform: translateY(-3px);
}

/* ==========================================================================
   Interactive Playground (Khu Vực Nghịch Hiệu Ứng)
   ========================================================================== */
.playground-section {
  padding: 60px 0 100px;
}

.section-headline {
  text-align: center;
  margin-bottom: 48px;
}

.section-headline h2 {
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  margin-bottom: 12px;
}

.section-headline p {
  color: var(--text-muted);
  font-size: 1.05rem;
}

.playground-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 32px;
}

@media (max-width: 960px) {
  .playground-grid {
    grid-template-columns: 1fr;
  }
}

.interactive-panel {
  background: var(--bg-surface);
  backdrop-filter: blur(28px);
  -webkit-backdrop-filter: blur(28px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 34px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.65);
  position: relative;
  overflow: hidden;
  transition: all 0.3s;
}

.interactive-panel:hover {
  border-color: var(--border-hover);
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.8), 0 0 30px var(--primary-glow);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
}

.panel-chip {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  color: var(--secondary);
}

/* Physics Buttons */
.physics-controls {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.physics-hint {
  font-size: 0.92rem;
  color: #CBD5E1;
  background: rgba(255, 255, 255, 0.03);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  border: 1px dashed var(--border-subtle);
}

.mode-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.mode-btn {
  padding: 11px 20px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: #FFFFFF;
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.mode-btn:hover, .mode-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  box-shadow: 0 4px 18px var(--primary-glow);
  transform: translateY(-2px);
}

/* Synth Soundboard */
.soundboard-wrap {
  margin-top: 24px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
}

.soundboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.soundboard-header h4 {
  font-size: 0.95rem;
  color: #FFFFFF;
}

.sound-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.sound-pad {
  padding: 16px 10px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: #FFFFFF;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  transition: all 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  user-select: none;
}

.sound-pad:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--secondary);
  transform: translateY(-2px);
}

.sound-pad:active, .sound-pad.pressed {
  background: var(--primary);
  border-color: var(--primary);
  box-shadow: 0 0 24px var(--primary-glow);
  transform: scale(0.94);
}

.pad-key {
  font-size: 0.7rem;
  color: var(--text-dim);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 4px;
  padding: 2px 6px;
}

/* Reactor Core Clicker Toy */
.reactor-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  justify-content: center;
  height: 100%;
}

.reactor-orb {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--primary) 0%, rgba(6, 182, 212, 0.25) 55%, transparent 75%);
  border: 2px solid var(--secondary);
  box-shadow: 0 0 50px var(--secondary-glow), inset 0 0 30px var(--primary-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  user-select: none;
  transition: transform 0.15s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s;
  margin-bottom: 24px;
}

.reactor-orb:hover {
  transform: scale(1.1);
  box-shadow: 0 0 70px var(--primary-glow), inset 0 0 45px var(--secondary-glow);
}

.reactor-orb:active {
  transform: scale(0.9);
}

.ring-dashed {
  position: absolute;
  inset: -14px;
  border-radius: 50%;
  border: 1.5px dashed var(--secondary);
  animation: rotate-cw 12s linear infinite;
  pointer-events: none;
}

.ring-dotted {
  position: absolute;
  inset: -26px;
  border-radius: 50%;
  border: 1px dotted var(--primary);
  animation: rotate-ccw 18s linear infinite;
  pointer-events: none;
}

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

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

.orb-core-symbol {
  font-size: 2.6rem;
  filter: drop-shadow(0 0 12px #FFFFFF);
}

.energy-track {
  width: 100%;
  background: rgba(255, 255, 255, 0.08);
  height: 10px;
  border-radius: var(--radius-full);
  overflow: hidden;
  margin: 14px 0 10px;
  border: 1px solid var(--border-subtle);
}

.energy-bar {
  height: 100%;
  width: 20%;
  background: var(--grad-main);
  border-radius: var(--radius-full);
  transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 0 14px var(--primary);
}

.reactor-gauge {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--secondary);
  font-weight: 700;
  margin-bottom: 4px;
}

/* ==========================================================================
   3D Holographic Prismatic Cards (Curated Pillars)
   ========================================================================== */
.pillars-section {
  padding: 60px 0 100px;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 28px;
  perspective: 1200px;
}

.hologram-card {
  background: var(--bg-surface);
  backdrop-filter: blur(28px);
  -webkit-backdrop-filter: blur(28px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 0.15s ease-out, border-color 0.3s, box-shadow 0.3s;
}

.hologram-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.75), 0 0 35px var(--primary-glow);
}

/* Prismatic Rainbow Sheen */
.hologram-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 0%, rgba(255, 255, 255, 0.06) 40%, rgba(139, 92, 246, 0.25) 50%, rgba(6, 182, 212, 0.25) 60%, transparent 100%);
  opacity: 0;
  transition: opacity 0.35s ease;
  pointer-events: none;
}

.hologram-card:hover::before {
  opacity: 1;
}

.card-icon-box {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 22px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
}

.card-heading {
  font-size: 1.35rem;
  margin-bottom: 10px;
}

.card-text {
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 24px;
}

.card-stats-tag {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ==========================================================================
   Ecosystem Hub
   ========================================================================== */
.ecosystem-section {
  padding: 60px 0 120px;
  text-align: center;
}

.eco-grid {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 36px;
}

.eco-capsule {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  text-decoration: none;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.eco-capsule:hover {
  background: var(--bg-surface-hover);
  border-color: var(--secondary);
  color: #FFFFFF;
  transform: translateY(-3px);
  box-shadow: 0 10px 24px var(--secondary-glow);
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 40px 0;
  position: relative;
  z-index: 2;
  font-size: 0.88rem;
  color: var(--text-dim);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

/* Toast */
.cyber-toast {
  position: fixed;
  bottom: 28px;
  right: 28px;
  padding: 14px 24px;
  border-radius: var(--radius-md);
  background: rgba(12, 16, 28, 0.95);
  backdrop-filter: blur(24px);
  border: 1px solid var(--primary);
  color: #FFFFFF;
  font-size: 0.92rem;
  z-index: 10001;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.8), 0 0 25px var(--primary-glow);
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
}

.cyber-toast.show {
  transform: translateY(0);
  opacity: 1;
}