:root {
    --primary-color: #4facfe;
    --secondary-color: #00f2fe;
    --text-color: #333;
    --glass-bg: rgba(255, 255, 255, 0.25);
    --glass-border: rgba(255, 255, 255, 0.18);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #e0c3fc 0%, #8ec5fc 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-color);
}

.glass-container {
    background: var(--glass-bg);
    box-shadow: var(--glass-shadow);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    padding: 40px;
    width: 90%;
    max-width: 800px;
}

h1, h2, h3 {
    text-align: center;
    color: #fff;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.2);
}

input[type="text"], input[type="password"], input[type="number"], select {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    border-radius: 10px;
    border: none;
    background: rgba(255, 255, 255, 0.5);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
    font-size: 16px;
    box-sizing: border-box;
}

button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 16px;
    transition: transform 0.2s, box-shadow 0.2s;
    margin: 5px;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.question-box {
    margin-bottom: 20px;
}

.options-label {
    display: block;
    margin: 10px 0;
    padding: 10px;
    background: rgba(255,255,255,0.4);
    border-radius: 8px;
    cursor: pointer;
}

.options-label:hover {
    background: rgba(255,255,255,0.6);
}

.timer {
    font-size: 24px;
    font-weight: bold;
    text-align: right;
    color: #ff4757;
}

.correct-ans { color: #2ed573; font-weight: bold; }
.wrong-ans { color: #ff4757; font-weight: bold; }

/* Flexbox utilities */
.flex-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}