:root {
    --bg-color: #0d1117;
    --card-bg: #161b22;
    --accent: #58a6ff;
    --success: #238636;
    --error: #da3633;
    --text: #c9d1d9;
}

body {
    font-family: 'Segoe UI', sans-serif;
    background-color: var(--bg-color);
    color: var(--text);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
}

.app-container { width: 100%; max-width: 500px; padding: 20px; text-align: center; }

.screen { transition: all 0.3s ease; }
.hidden { display: none; }

/* Setup Inputs */
input, select {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    background: #21262d;
    border: 1px solid #30363d;
    color: white;
    border-radius: 6px;
}

/* Stats Bar */
.stats-bar {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    font-size: 0.9rem;
    color: var(--accent);
}

/* Quiz Card */
.card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid #30363d;
    margin-bottom: 20px;
}

/* Choices Grid */
.choices-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 20px;
}

button {
    background: var(--accent);
    color: white;
    border: none;
    padding: 12px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
}

.choice-btn {
    background: #21262d;
    border: 1px solid #30363d;
}

.choice-btn:hover { background: #30363d; }

.correct { background-color: var(--success) !important; }
.wrong { background-color: var(--error) !important; }