:root {
    --bg-primary: #0b0e1a;
    --bg-secondary: #121628;
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --accent: #7c5cff;
    --accent-2: #22d3ee;
    --accent-3: #ffb454;
    --text-primary: #f1f3fb;
    --text-muted: #9aa1b9;
    --success: #34d399;
    --danger: #f87171;
    --radius: 18px;
    --shadow: 0 20px 50px rgba(0,0,0,0.45);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Inter', 'Segoe UI', sans-serif;
    background: radial-gradient(circle at 15% 10%, #1a1f3d 0%, var(--bg-primary) 45%),
                radial-gradient(circle at 85% 90%, #1c1430 0%, var(--bg-primary) 50%);
    color: var(--text-primary);
    min-height: 100vh;
}

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

.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
}

/* NAVBAR */
.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 22px 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.35rem;
    letter-spacing: -0.5px;
}

.brand .logo-dot {
    width: 38px; height: 38px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 8px 24px rgba(124,92,255,0.45);
}

.nav-links { display: flex; gap: 8px; align-items: center; }

.pill-btn {
    padding: 10px 20px;
    border-radius: 999px;
    border: 1px solid var(--glass-border);
    background: var(--glass);
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.92rem;
    transition: all .2s ease;
    backdrop-filter: blur(12px);
}
.pill-btn:hover { background: rgba(255,255,255,0.12); transform: translateY(-2px); }

.pill-btn.primary {
    background: linear-gradient(135deg, var(--accent), #9b7bff);
    border: none;
    box-shadow: 0 10px 30px rgba(124,92,255,0.4);
}
.pill-btn.primary:hover { box-shadow: 0 14px 36px rgba(124,92,255,0.55); }

.pill-btn.ghost { background: transparent; border-color: transparent; color: var(--text-muted); }

/* GLASS CARD */
.glass-card {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    backdrop-filter: blur(18px);
    box-shadow: var(--shadow);
}

/* HERO */
.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 70px 0 40px;
}

.hero h1 {
    font-size: clamp(2.2rem, 5vw, 3.6rem);
    line-height: 1.1;
    margin: 0 0 18px;
    font-weight: 800;
    letter-spacing: -1.5px;
}

.hero h1 span {
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero p {
    color: var(--text-muted);
    max-width: 560px;
    font-size: 1.05rem;
    margin-bottom: 34px;
}

.hero-badges { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; margin-bottom: 36px; }
.hero-badge {
    padding: 8px 16px;
    border-radius: 999px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* AUTH CARD */
.auth-wrap {
    max-width: 420px;
    margin: 0 auto 60px;
    padding: 36px;
}

.tabs { display: flex; gap: 6px; margin-bottom: 26px; background: rgba(255,255,255,0.04); padding: 6px; border-radius: 14px; }
.tab-btn {
    flex: 1; padding: 10px 0; text-align: center; border-radius: 10px;
    cursor: pointer; font-weight: 600; color: var(--text-muted); font-size: 0.92rem;
    transition: all .2s;
}
.tab-btn.active { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #0b0e1a; }

.form-group { margin-bottom: 16px; text-align: left; }
.form-group label { display: block; font-size: 0.82rem; color: var(--text-muted); margin-bottom: 6px; font-weight: 600; }
.form-group input {
    width: 100%; padding: 13px 16px; border-radius: 12px;
    border: 1px solid var(--glass-border); background: rgba(255,255,255,0.04);
    color: var(--text-primary); font-size: 0.95rem; outline: none;
    transition: border-color .2s;
}
.form-group input:focus { border-color: var(--accent); }

.form-submit {
    width: 100%; padding: 14px; border-radius: 12px; border: none;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #0b0e1a; font-weight: 700; font-size: 1rem; cursor: pointer;
    margin-top: 6px; transition: transform .2s;
}
.form-submit:hover { transform: translateY(-2px); }

.error-msg {
    background: rgba(248,113,113,0.12); border: 1px solid rgba(248,113,113,0.35);
    color: #fca5a5; padding: 10px 14px; border-radius: 10px; font-size: 0.85rem; margin-bottom: 16px;
}
.success-msg {
    background: rgba(52,211,153,0.12); border: 1px solid rgba(52,211,153,0.35);
    color: #6ee7b7; padding: 10px 14px; border-radius: 10px; font-size: 0.85rem; margin-bottom: 16px;
}

/* DASHBOARD */
.dash-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 28px 32px; margin: 20px 0 36px;
}
.user-chip { display: flex; align-items: center; gap: 14px; }
.avatar {
    width: 52px; height: 52px; border-radius: 16px;
    background: linear-gradient(135deg, var(--accent-3), #ff7a7a);
    display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 1.2rem; color: #1a1a1a;
}
.user-meta .uname { font-weight: 700; font-size: 1.1rem; }
.user-meta .utier { font-size: 0.85rem; color: var(--text-muted); }

.stat-row { display: flex; gap: 28px; }
.stat-box { text-align: center; }
.stat-box .num { font-size: 1.6rem; font-weight: 800; }
.stat-box .lbl { font-size: 0.78rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }

.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 26px;
    margin-bottom: 50px;
}

.game-card {
    padding: 32px;
    position: relative;
    overflow: hidden;
    transition: transform .25s ease, box-shadow .25s ease;
}
.game-card:hover { transform: translateY(-6px); box-shadow: 0 26px 60px rgba(0,0,0,0.55); }

.game-icon {
    width: 64px; height: 64px; border-radius: 18px;
    display: flex; align-items: center; justify-content: center;
    font-size: 2rem; margin-bottom: 20px;
}
.game-card.chess .game-icon { background: linear-gradient(135deg, #7c5cff, #4d3cff); }
.game-card.checkers .game-icon { background: linear-gradient(135deg, #ff8a5b, #ff4d6d); }

.game-card h3 { font-size: 1.4rem; margin: 0 0 8px; }
.game-card p { color: var(--text-muted); font-size: 0.92rem; margin-bottom: 24px; }

.game-actions { display: flex; flex-direction: column; gap: 10px; }
.game-actions a {
    text-align: center; padding: 12px 14px; border-radius: 12px;
    font-weight: 700; font-size: 0.88rem; transition: all .2s;
}
.btn-ai { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #0b0e1a; }
.btn-ai:hover { filter: brightness(1.1); }
.btn-online { background: linear-gradient(135deg, #34d399, #22d3ee); color: #0b0e1a; }
.btn-online:hover { filter: brightness(1.1); }
.btn-friend { background: rgba(255,255,255,0.06); border: 1px solid var(--glass-border); }
.btn-friend:hover { background: rgba(255,255,255,0.12); }

/* LEADERBOARD */
.leaderboard-wrap { padding: 30px; margin-bottom: 50px; }
.lb-title { display: flex; align-items: center; justify-content: space-between; margin-bottom: 22px; }
.lb-title h2 { margin: 0; font-size: 1.3rem; }

table.lb-table { width: 100%; border-collapse: collapse; }
table.lb-table th {
    text-align: left; font-size: 0.78rem; color: var(--text-muted);
    text-transform: uppercase; letter-spacing: 0.5px; padding: 10px 14px; border-bottom: 1px solid var(--glass-border);
}
table.lb-table td { padding: 14px; border-bottom: 1px solid rgba(255,255,255,0.05); font-size: 0.95rem; }
table.lb-table tr:hover td { background: rgba(255,255,255,0.03); }
.rank-badge {
    width: 30px; height: 30px; border-radius: 10px; display: inline-flex;
    align-items: center; justify-content: center; font-weight: 800; font-size: 0.85rem;
    background: rgba(255,255,255,0.08);
}
.rank-1 { background: linear-gradient(135deg, #ffd54a, #ff9f43); color: #1a1a1a; }
.rank-2 { background: linear-gradient(135deg, #d9dee8, #9aa1b9); color: #1a1a1a; }
.rank-3 { background: linear-gradient(135deg, #e0a86f, #b06a3a); color: #1a1a1a; }

.tier-badge {
    padding: 4px 12px; border-radius: 999px; font-size: 0.78rem; font-weight: 700;
    display: inline-block;
}

.me-row td { background: rgba(124,92,255,0.08) !important; }

/* GAME PAGE */
.game-page-wrap {
    display: flex; gap: 34px; align-items: flex-start; flex-wrap: wrap;
    justify-content: center; padding: 30px 0 60px;
}
.board-panel { padding: 24px; }
.side-panel { width: 300px; padding: 26px; }

.side-panel h3 { margin-top: 0; }
.player-slot {
    display: flex; align-items: center; gap: 12px; padding: 14px;
    border-radius: 14px; background: rgba(255,255,255,0.04); margin-bottom: 12px;
    border: 1px solid transparent;
}
.player-slot.active-turn { border-color: var(--accent); background: rgba(124,92,255,0.12); }
.player-slot .mini-avatar {
    width: 38px; height: 38px; border-radius: 10px; display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 0.95rem;
}

.status-box {
    margin-top: 18px; padding: 16px; border-radius: 14px;
    background: rgba(255,255,255,0.04); font-size: 0.92rem; color: var(--text-muted);
    min-height: 24px; text-align: center;
}
.status-box.win { color: #6ee7b7; background: rgba(52,211,153,0.12); font-weight: 700; }
.status-box.lose { color: #fca5a5; background: rgba(248,113,113,0.12); font-weight: 700; }
.status-box.draw { color: #ffd54a; background: rgba(255,213,74,0.12); font-weight: 700; }

.control-row { display: flex; gap: 10px; margin-top: 18px; }
.control-row .pill-btn { flex: 1; padding: 11px; font-size: 0.85rem; }

#chessboard { width: 420px; max-width: 88vw; }
#checkersboard { width: 420px; max-width: 88vw; }

footer { text-align: center; padding: 30px; color: var(--text-muted); font-size: 0.85rem; }

@media (max-width: 600px) {
    .dash-header { flex-direction: column; gap: 20px; align-items: flex-start; }
    .stat-row { width: 100%; justify-content: space-between; }
}