:root {
    --bg-color: #f0f2f5;
    --card-bg: rgba(255, 255, 255, 0.7);
    --text-color: #1a1a1a;
    --primary-color: #0d6efd;
    --border-color: rgba(255, 255, 255, 0.5);
}

[data-bs-theme="dark"] {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-color: #f8fafc;
    --primary-color: #38bdf8;
    --border-color: rgba(255, 255, 255, 0.1);
}

body {
    font-family: 'Plus Jakarta Sans', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: all 0.3s ease;
}

.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 28px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.1);
}

.btn-theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background: var(--primary-color);
    color: white;
    font-size: 1.5rem;
}

.profile-chip {
    display: inline-block;
    padding: 8px 20px;
    background: var(--card-bg);
    border-radius: 100px;
    border: 1px solid var(--border-color);
}

.course-card {
    transition: all 0.3s ease;
    cursor: pointer;
    border-bottom: 4px solid transparent;
}

.course-card:hover {
    transform: translateY(-8px);
    border-bottom-color: var(--primary-color);
    background: white;
}

[data-bs-theme="dark"] .course-card:hover { background: #1e293b; }

.timer-orb {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
}

.option-btn {
    border: 1px solid var(--border-color);
    padding: 18px;
    border-radius: 18px;
    background: var(--card-bg);
    color: var(--text-color);
    text-align: left;
    font-weight: 600;
    transition: 0.2s;
}

.option-btn:hover { background: var(--primary-color); color: white; }

.score-circle {
    width: 120px;
    height: 120px;
    background: var(--primary-color);
    color: white;
    font-size: 2rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}