/* /assets/css/student.css */

:root {
    --brand-primary: #2563eb;
    --brand-hover: #1d4ed8;
    --bg-light: #f8fafc;
    --surface: #ffffff;
    --text-dark: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --danger: #ef4444;
    --success: #10b981;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.2s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', system-ui, sans-serif; }

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

/* Reusable Animation */
@keyframes slideUpFade {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- Login Page Styles (index.php) --- */
.login-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
    padding: 20px;
}

.login-card {
    background: var(--surface);
    padding: 48px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    width: 100%;
    max-width: 440px;
    animation: slideUpFade 0.6s ease;
    text-align: center;
}

.brand-icon { font-size: 48px; color: var(--brand-primary); margin-bottom: 16px; }
.brand-title { font-size: 1.5rem; font-weight: 700; margin-bottom: 8px; }

.input-group { text-align: left; margin-bottom: 24px; position: relative; }
.input-group label { display: block; font-size: 0.875rem; font-weight: 600; margin-bottom: 8px; color: var(--text-muted); }
.input-group input { width: 100%; padding: 14px 16px 14px 44px; border: 2px solid var(--border-color); border-radius: var(--radius-md); font-size: 1rem; transition: var(--transition); outline: none; }
.input-icon { position: absolute; left: 16px; top: 42px; color: var(--text-muted); transition: var(--transition); }
.input-group input:focus { border-color: var(--brand-primary); box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1); }
.input-group input:focus + .input-icon { color: var(--brand-primary); }

.btn-submit { width: 100%; padding: 16px; background: var(--brand-primary); color: white; border: none; border-radius: var(--radius-md); font-size: 1.1rem; font-weight: 600; cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 10px; transition: var(--transition); }
.btn-submit:hover { background: var(--brand-hover); transform: translateY(-2px); }

/* --- Exam Page Styles (exam.php) --- */
.exam-header {
    background: var(--surface);
    padding: 16px 5%;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 10;
}

.student-info { display: flex; align-items: center; gap: 10px; font-weight: 600; }
.timer-badge { background: #fee2e2; color: #b91c1c; padding: 8px 16px; border-radius: 30px; font-weight: 700; font-variant-numeric: tabular-nums; display: flex; align-items: center; gap: 8px; transition: var(--transition); }

.progress-container { width: 100%; height: 6px; background: var(--border-color); }
.progress-bar { height: 100%; background: var(--brand-primary); transition: width 0.5s ease; }

.exam-container { flex: 1; max-width: 800px; margin: 40px auto; width: 90%; animation: slideUpFade 0.4s ease; }
.question-meta { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 16px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.5px; }
.question-text { font-size: 1.5rem; line-height: 1.4; font-weight: 600; margin-bottom: 32px; color: var(--text-dark); }

.options-grid { display: flex; flex-direction: column; gap: 16px; }
.option-label { display: flex; align-items: center; padding: 20px; background: var(--surface); border: 2px solid var(--border-color); border-radius: var(--radius-lg); cursor: pointer; transition: var(--transition); font-size: 1.1rem; }
.option-label:hover { border-color: #93c5fd; background: #f0f9ff; }
.option-input { display: none; }
.option-input:checked + .option-label { border-color: var(--brand-primary); background: #eff6ff; box-shadow: 0 4px 12px rgba(37, 99, 235, 0.1); }

.option-letter { width: 32px; height: 32px; border-radius: 8px; background: var(--bg-light); color: var(--text-muted); display: flex; align-items: center; justify-content: center; font-weight: 700; margin-right: 16px; transition: var(--transition); }
.option-input:checked + .option-label .option-letter { background: var(--brand-primary); color: white; }

.exam-controls { display: flex; justify-content: space-between; margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--border-color); }
.btn { padding: 14px 28px; border-radius: 8px; font-size: 1rem; font-weight: 600; cursor: pointer; border: none; display: flex; align-items: center; gap: 8px; transition: var(--transition); }
.btn-outline { background: var(--surface); border: 2px solid var(--border-color); color: var(--text-dark); }
.btn-outline:hover { background: var(--bg-light); }
.btn-primary { background: var(--brand-primary); color: white; }
.btn-primary:hover { background: var(--brand-hover); transform: translateX(2px); }