:root {
  --bg-primary: #0f1117;
  --bg-secondary: #181b24;
  --bg-card: #1e222d;
  --bg-card-hover: #262b3a;
  --border-color: rgba(255, 255, 255, 0.08);
  --accent-color: #5865f2;
  --accent-hover: #4752c4;
  --accent-gold: #f1c40f;
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --success: #2ecc71;
  --danger: #e74c3c;
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 6px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Navbar */
.navbar {
  height: 70px;
  background-color: rgba(24, 27, 36, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.brand-badge {
  background: linear-gradient(135deg, #f1c40f, #e67e22);
  color: #000;
  font-size: 11px;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 12px;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
}

.btn-primary {
  background-color: var(--accent-color);
  color: #fff;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.14);
}

.btn-success {
  background-color: var(--success);
  color: #fff;
}

.btn-danger {
  background-color: var(--danger);
  color: #fff;
}

/* User Pill */
.user-pill {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 30px;
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
  width: 100%;
  flex: 1;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 80px 20px;
  background: radial-gradient(circle at 50% 20%, rgba(88, 101, 242, 0.15) 0%, transparent 60%);
}

.hero h1 {
  font-size: 54px;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero p {
  font-size: 20px;
  color: var(--text-muted);
  max-width: 700px;
  margin: 0 auto 36px;
}

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

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.card:hover {
  background-color: var(--bg-card-hover);
  border-color: rgba(88, 101, 242, 0.4);
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(88, 101, 242, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.card-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 20px;
}

/* Toggle Switch */
.switch {
  position: relative;
  display: inline-block;
  width: 46px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #3f4453;
  transition: .3s;
  border-radius: 24px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .3s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--success);
}

input:checked + .slider:before {
  transform: translateX(22px);
}

/* Forms */
.form-group {
  margin-bottom: 24px;
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-main);
}

.form-help {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

.form-control:focus {
  border-color: var(--accent-color);
}

textarea.form-control {
  min-height: 120px;
  resize: vertical;
}

/* Leaderboard */
.lb-header {
  text-align: center;
  margin-bottom: 40px;
}

.lb-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.lb-table th, .lb-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.lb-table th {
  background-color: rgba(0, 0, 0, 0.2);
  color: var(--text-muted);
  font-size: 12px;
  text-transform: uppercase;
  font-weight: 700;
}

.lb-table tr:hover {
  background-color: var(--bg-card-hover);
}

.rank-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  font-weight: 800;
  font-size: 14px;
}

.rank-1 { background: gold; color: #000; }
.rank-2 { background: silver; color: #000; }
.rank-3 { background: #cd7f32; color: #fff; }

/* Toast */
#toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--success);
  color: #fff;
  padding: 14px 24px;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  font-weight: 600;
  display: none;
  z-index: 1000;
}