:root {
  --primary: #FF6B35;
  --primary-light: #FF8E53;
  --secondary: #004E89;
  --accent: #FFD166;
  --success: #06D6A0;
  --danger: #EF476F;
  --bg: #0F0F23;
  --surface: #1A1A2E;
  --surface-elevated: #252540;
  --text-primary: #EAEAEA;
  --text-secondary: #A0A3BD;
  --border: rgba(255,255,255,0.1);
  --radius: 16px;
  --radius-lg: 24px;
  --shadow: 0 4px 20px rgba(0,0,0,0.3);
  --max-width: 1200px;
  --nav-height: 64px;
  --footer-height: auto;
}

* { margin:0; padding:0; box-sizing:border-box; -webkit-tap-highlight-color:transparent; }
html, body { height:100%; }
body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: #050510;
  color: var(--text-primary);
  overflow-x: hidden;
  line-height: 1.6;
}

/* Web Layout */
.app-container {
  max-width: var(--max-width);
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  position: relative;
}

.main-content {
  flex: 1;
  padding: 24px;
  padding-top: calc(var(--nav-height) + 24px);
  padding-bottom: 100px;
}

.page { display:none; }
.page.active { display:block; animation: fadeIn 0.3s ease; }

/* Grid System */
.grid { display:grid; gap:24px; }
.grid-1 { grid-template-columns: 1fr; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Typography */
h1 { font-size: clamp(28px, 4vw, 48px); font-weight:700; letter-spacing:-0.5px; line-height:1.2; }
h2 { font-size: clamp(22px, 3vw, 36px); font-weight:600; line-height:1.3; }
h3 { font-size: clamp(18px, 2vw, 24px); font-weight:600; }
p, body { font-size: clamp(15px, 1.2vw, 17px); line-height:1.6; }
.small { font-size: clamp(13px, 1vw, 15px); }
.caption { font-size: clamp(12px, 0.9vw, 14px); font-weight:500; color:var(--text-secondary); }

/* Utilities */
.flex { display:flex; }
.flex-col { display:flex; flex-direction:column; }
.items-center { align-items:center; }
.justify-between { justify-content:space-between; }
.justify-center { justify-content:center; }
.gap-2 { gap:8px; }
.gap-3 { gap:12px; }
.gap-4 { gap:16px; }
.gap-6 { gap:24px; }
.p-4 { padding:16px; }
.p-6 { padding:24px; }
.px-4 { padding-left:16px; padding-right:16px; }
.px-6 { padding-left:24px; padding-right:24px; }
.py-3 { padding-top:12px; padding-bottom:12px; }
.py-6 { padding-top:24px; padding-bottom:24px; }
.mt-2 { margin-top:8px; }
.mt-3 { margin-top:12px; }
.mt-4 { margin-top:16px; }
.mt-6 { margin-top:24px; }
.mt-8 { margin-top:32px; }
.mb-4 { margin-bottom:16px; }
.mb-6 { margin-bottom:24px; }
.mb-8 { margin-bottom:32px; }
.w-full { width:100%; }
.text-center { text-align:center; }
.text-left { text-align:left; }
.text-primary { color:var(--primary); }
.text-accent { color:var(--accent); }
.text-secondary { color:var(--text-secondary); }
.text-success { color:var(--success); }
.text-danger { color:var(--danger); }

/* Responsive Breakpoints */
@media (min-width: 768px) {
  .main-content { padding: 32px; padding-top: calc(var(--nav-height) + 32px); padding-bottom: 40px; }
  .md-grid-2 { grid-template-columns: repeat(2, 1fr); }
  .md-flex-row { flex-direction:row; }
  .md-w-50 { width:50%; }
}

@media (min-width: 1024px) {
  .lg-grid-3 { grid-template-columns: repeat(3, 1fr); }
  .lg-grid-4 { grid-template-columns: repeat(4, 1fr); }
  .lg-flex-row { flex-direction:row; }
  .main-content { padding: 40px; padding-top: calc(var(--nav-height) + 40px); }
}

@media (max-width: 767px) {
  .hide-mobile { display:none !important; }
}

@media (min-width: 768px) {
  .hide-desktop { display:none !important; }
}

@keyframes fadeIn {
  from { opacity:0; transform:translateY(10px); }
  to { opacity:1; transform:translateY(0); }
}
@keyframes slideUp {
  from { transform:translateY(100%); }
  to { transform:translateY(0); }
}
@keyframes pulse {
  0%,100% { transform:scale(1); }
  50% { transform:scale(1.05); }
}
@keyframes float {
  0%,100% { transform:translateY(0); }
  50% { transform:translateY(-6px); }
}
@keyframes spin {
  from { transform:rotate(0deg); }
  to { transform:rotate(360deg); }
}
@keyframes shimmer {
  0% { background-position:-200% 0; }
  100% { background-position:200% 0; }
}
@keyframes shake {
  0%,100% { transform:translateX(0); }
  25% { transform:translateX(-6px); }
  75% { transform:translateX(6px); }
}
@keyframes pop {
  0% { transform:scale(0.8); opacity:0; }
  100% { transform:scale(1); opacity:1; }
}