/* ============================================================
   Brandlevate CBT System – Front-end Styles
   Author: Brandlevate Technologies  |  v1.0.0
   ============================================================ */

/* ── CSS Variables ─────────────────────────────────────────── */
:root {
    --blv-primary:       #2563eb;
    --blv-primary-dark:  #1d4ed8;
    --blv-primary-light: #eff6ff;
    --blv-success:       #16a34a;
    --blv-success-light: #f0fdf4;
    --blv-danger:        #dc2626;
    --blv-danger-light:  #fef2f2;
    --blv-warning:       #d97706;
    --blv-warning-light: #fffbeb;
    --blv-secondary:     #6b7280;
    --blv-gray-50:       #f9fafb;
    --blv-gray-100:      #f3f4f6;
    --blv-gray-200:      #e5e7eb;
    --blv-gray-300:      #d1d5db;
    --blv-gray-400:      #9ca3af;
    --blv-gray-600:      #4b5563;
    --blv-gray-700:      #374151;
    --blv-gray-800:      #1f2937;
    --blv-white:         #ffffff;
    --blv-radius:        8px;
    --blv-radius-lg:     12px;
    --blv-shadow:        0 1px 3px rgba(0,0,0,.12), 0 1px 2px rgba(0,0,0,.08);
    --blv-shadow-lg:     0 10px 25px rgba(0,0,0,.12);
    --blv-font:          -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --blv-transition:    all .2s ease;
}

/* ── Reset / Base ──────────────────────────────────────────── */
.blv-cbt-wrap *, .blv-cbt-wrap *::before, .blv-cbt-wrap *::after,
.blv-modal *, .blv-exam-container *, .blv-exam-container *::before {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.blv-cbt-wrap, .blv-exam-container {
    font-family: var(--blv-font);
    color: var(--blv-gray-800);
    line-height: 1.6;
}

/* ── Login Card ────────────────────────────────────────────── */
.blv-login-wrap {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 80vh;
    padding: 20px;
    background: linear-gradient(135deg, var(--blv-primary-light) 0%, var(--blv-gray-50) 100%);
}

.blv-login-card {
    background: var(--blv-white);
    border-radius: var(--blv-radius-lg);
    box-shadow: var(--blv-shadow-lg);
    padding: 40px 36px;
    width: 100%;
    max-width: 420px;
}

.blv-login-header {
    text-align: center;
    margin-bottom: 28px;
}

.blv-school-logo {
    max-height: 72px;
    object-fit: contain;
    margin-bottom: 12px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.blv-login-header h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--blv-gray-800);
    margin-bottom: 4px;
}

.blv-subtitle {
    font-size: .875rem;
    color: var(--blv-secondary);
}

.blv-login-hint {
    text-align: center;
    font-size: .8rem;
    color: var(--blv-gray-400);
    margin-top: 16px;
}

/* ── Forms ─────────────────────────────────────────────────── */
.blv-form-group {
    margin-bottom: 16px;
    flex: 1;
}

.blv-form-group label {
    display: block;
    font-size: .875rem;
    font-weight: 600;
    color: var(--blv-gray-700);
    margin-bottom: 6px;
}

.blv-form-row {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.blv-form-row .blv-form-group { flex: 1; min-width: 140px; }

.blv-input, .blv-select {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid var(--blv-gray-300);
    border-radius: var(--blv-radius);
    font-size: .9rem;
    font-family: var(--blv-font);
    color: var(--blv-gray-800);
    background: var(--blv-white);
    transition: var(--blv-transition);
    outline: none;
}

.blv-input:focus, .blv-select:focus {
    border-color: var(--blv-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}

.blv-input-wrap {
    position: relative;
}

.blv-input-wrap .blv-input { padding-right: 40px; }

.blv-toggle-pw {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--blv-gray-400);
    padding: 4px;
    display: flex;
    align-items: center;
}

.blv-hint { font-size: .78rem; color: var(--blv-gray-400); margin-top: 4px; }

/* ── Buttons ───────────────────────────────────────────────── */
.blv-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    border: 1.5px solid transparent;
    border-radius: var(--blv-radius);
    font-size: .875rem;
    font-weight: 600;
    font-family: var(--blv-font);
    cursor: pointer;
    transition: var(--blv-transition);
    text-decoration: none;
    white-space: nowrap;
}

.blv-btn:disabled { opacity: .5; cursor: not-allowed; }

.blv-btn-primary  { background: var(--blv-primary); color: var(--blv-white); border-color: var(--blv-primary); }
.blv-btn-primary:hover { background: var(--blv-primary-dark); border-color: var(--blv-primary-dark); color: var(--blv-white); }

.blv-btn-outline  { background: transparent; color: var(--blv-primary); border-color: var(--blv-primary); }
.blv-btn-outline:hover { background: var(--blv-primary-light); }

.blv-btn-danger   { background: var(--blv-danger); color: var(--blv-white); border-color: var(--blv-danger); }
.blv-btn-danger:hover { background: #b91c1c; border-color: #b91c1c; color: var(--blv-white); }

.blv-btn-block { width: 100%; }
.blv-btn-sm    { padding: 7px 14px; font-size: .8rem; }
.blv-btn-xs    { padding: 4px 10px; font-size: .75rem; }
.blv-btn-lg    { padding: 14px 28px; font-size: 1rem; }

/* ── Spinner ───────────────────────────────────────────────── */
.blv-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,.4);
    border-top-color: #fff;
    border-radius: 50%;
    animation: blv-spin .6s linear infinite;
    display: inline-block;
}

@keyframes blv-spin { to { transform: rotate(360deg); } }

/* ── Alert ─────────────────────────────────────────────────── */
.blv-alert {
    padding: 12px 16px;
    border-radius: var(--blv-radius);
    font-size: .875rem;
    margin-bottom: 16px;
    border-left: 4px solid;
}
.blv-alert-success { background: var(--blv-success-light); border-color: var(--blv-success); color: var(--blv-success); }
.blv-alert-error   { background: var(--blv-danger-light);  border-color: var(--blv-danger);  color: var(--blv-danger);  }
.blv-alert-warning { background: var(--blv-warning-light); border-color: var(--blv-warning); color: var(--blv-warning); }

/* ── Badges ────────────────────────────────────────────────── */
.blv-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 999px;
    font-size: .72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .04em;
}
.blv-badge-success   { background: var(--blv-success-light); color: var(--blv-success); }
.blv-badge-danger    { background: var(--blv-danger-light);  color: var(--blv-danger); }
.blv-badge-warning   { background: var(--blv-warning-light); color: var(--blv-warning); }
.blv-badge-secondary { background: var(--blv-gray-100);      color: var(--blv-secondary); }

/* ── Dashboard Header ──────────────────────────────────────── */
.blv-dash-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--blv-white);
    border-bottom: 1px solid var(--blv-gray-200);
    flex-wrap: wrap;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--blv-shadow);
}

.blv-top-logo { max-height: 40px; object-fit: contain; }

.blv-student-info {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.blv-student-name { font-weight: 700; font-size: 1rem; color: var(--blv-gray-800); }
.blv-student-meta { font-size: .78rem; color: var(--blv-secondary); }

/* ── Dash Body / Tabs ──────────────────────────────────────── */
.blv-dash-body { padding: 24px 20px; }

.blv-tabs { display: flex; gap: 4px; margin-bottom: 24px; border-bottom: 2px solid var(--blv-gray-200); }

.blv-tab-btn {
    background: none;
    border: none;
    padding: 10px 20px;
    font-size: .875rem;
    font-weight: 600;
    color: var(--blv-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: var(--blv-transition);
}

.blv-tab-btn.active { color: var(--blv-primary); border-bottom-color: var(--blv-primary); }
.blv-tab-pane { display: none; }
.blv-tab-pane.active { display: block; }

/* ── Exam Grid ─────────────────────────────────────────────── */
.blv-exam-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
}

.blv-exam-card {
    background: var(--blv-white);
    border: 1.5px solid var(--blv-gray-200);
    border-radius: var(--blv-radius-lg);
    padding: 20px;
    transition: var(--blv-transition);
    box-shadow: var(--blv-shadow);
}

.blv-exam-card.available { border-color: var(--blv-primary); }
.blv-exam-card.available:hover { box-shadow: var(--blv-shadow-lg); transform: translateY(-2px); }
.blv-exam-card.locked { opacity: .7; }

.blv-exam-card-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.blv-exam-subject { font-size: .75rem; font-weight: 700; color: var(--blv-primary); text-transform: uppercase; letter-spacing: .06em; }

.blv-exam-title { font-size: 1rem; font-weight: 700; color: var(--blv-gray-800); margin-bottom: 12px; }

.blv-exam-meta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    font-size: .78rem;
    color: var(--blv-secondary);
    margin-bottom: 16px;
}

/* ── Exam Container ────────────────────────────────────────── */
.blv-exam-container {
    position: fixed;
    inset: 0;
    background: var(--blv-gray-50);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    font-family: var(--blv-font);
}

.blv-exam-top-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 20px;
    background: var(--blv-primary);
    color: var(--blv-white);
    flex-shrink: 0;
}

.blv-exam-title-bar { flex: 1; font-weight: 700; font-size: 1rem; }

.blv-timer {
    font-size: 1.3rem;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    background: rgba(255,255,255,.15);
    padding: 6px 14px;
    border-radius: var(--blv-radius);
    min-width: 90px;
    text-align: center;
}

.blv-timer.danger { background: var(--blv-danger); animation: blv-pulse 1s infinite; }
@keyframes blv-pulse { 0%,100%{opacity:1} 50%{opacity:.7} }

.blv-exam-body {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.blv-question-panel {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.blv-question-progress {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: .8rem;
    color: var(--blv-secondary);
    font-weight: 600;
}

.blv-progress-bar { flex: 1; height: 6px; background: var(--blv-gray-200); border-radius: 999px; overflow: hidden; }
.blv-progress-fill { height: 100%; background: var(--blv-primary); border-radius: 999px; transition: width .3s ease; }

.blv-question-text {
    background: var(--blv-white);
    border: 1.5px solid var(--blv-gray-200);
    border-radius: var(--blv-radius-lg);
    padding: 20px 24px;
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--blv-gray-800);
    line-height: 1.7;
    box-shadow: var(--blv-shadow);
}

#blv-question-image img { max-width: 100%; border-radius: var(--blv-radius); margin-bottom: 8px; }

.blv-options { display: flex; flex-direction: column; gap: 10px; }

.blv-option-label {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    background: var(--blv-white);
    border: 1.5px solid var(--blv-gray-200);
    border-radius: var(--blv-radius);
    cursor: pointer;
    font-size: .9rem;
    transition: var(--blv-transition);
    box-shadow: var(--blv-shadow);
}

.blv-option-label:hover { border-color: var(--blv-primary); background: var(--blv-primary-light); }
.blv-option-label.selected { border-color: var(--blv-primary); background: var(--blv-primary-light); font-weight: 600; }

.blv-option-key {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--blv-gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: .8rem;
    flex-shrink: 0;
    text-transform: uppercase;
}

.blv-option-label.selected .blv-option-key {
    background: var(--blv-primary);
    color: var(--blv-white);
}

.blv-option-label input[type="radio"] { display: none; }

.blv-short-answer .blv-input { font-size: 1rem; }

/* ── Question Nav Panel ────────────────────────────────────── */
.blv-nav-panel {
    width: 180px;
    border-left: 1px solid var(--blv-gray-200);
    background: var(--blv-white);
    overflow-y: auto;
    padding: 16px;
    flex-shrink: 0;
}

.blv-nav-header { font-size: .8rem; font-weight: 700; color: var(--blv-secondary); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 12px; }

.blv-q-nav { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }

.blv-q-nav-btn {
    width: 32px;
    height: 32px;
    border-radius: var(--blv-radius);
    border: 1.5px solid var(--blv-gray-200);
    background: var(--blv-gray-50);
    font-size: .75rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--blv-transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.blv-q-nav-btn.answered { background: var(--blv-success-light); border-color: var(--blv-success); color: var(--blv-success); }
.blv-q-nav-btn.current  { background: var(--blv-primary); border-color: var(--blv-primary); color: var(--blv-white); }

/* ── Exam Footer ───────────────────────────────────────────── */
.blv-exam-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 24px;
    background: var(--blv-white);
    border-top: 1px solid var(--blv-gray-200);
    flex-shrink: 0;
    gap: 12px;
}

.blv-save-status { font-size: .8rem; color: var(--blv-secondary); flex: 1; text-align: center; }

/* ── Modal ─────────────────────────────────────────────────── */
.blv-modal {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.5);
    z-index: 99999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.blv-modal-content {
    background: var(--blv-white);
    border-radius: var(--blv-radius-lg);
    padding: 28px;
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--blv-shadow-lg);
}

.blv-modal-lg { max-width: 680px; }

.blv-modal-content h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 20px; }

.blv-modal-actions { display: flex; gap: 10px; margin-top: 20px; flex-wrap: wrap; }

/* ── Result Card ───────────────────────────────────────────── */
.blv-result-content { text-align: center; }

.blv-result-score {
    font-size: 3rem;
    font-weight: 800;
    color: var(--blv-primary);
    line-height: 1;
    margin: 12px 0;
}

.blv-result-pass { color: var(--blv-success); }
.blv-result-fail { color: var(--blv-danger); }

.blv-corrections { text-align: left; margin-top: 20px; }
.blv-correction-item {
    border: 1px solid var(--blv-gray-200);
    border-radius: var(--blv-radius);
    padding: 12px 16px;
    margin-bottom: 10px;
    font-size: .875rem;
}
.blv-correction-item.correct { border-left: 4px solid var(--blv-success); }
.blv-correction-item.wrong   { border-left: 4px solid var(--blv-danger); }

/* ── Empty state ───────────────────────────────────────────── */
.blv-empty { text-align: center; padding: 40px 20px; color: var(--blv-secondary); font-size: .9rem; }
.blv-loading { text-align: center; padding: 20px; color: var(--blv-secondary); }

/* ── Results Table ─────────────────────────────────────────── */
.blv-results-table { width: 100%; border-collapse: collapse; font-size: .875rem; }
.blv-results-table th, .blv-results-table td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--blv-gray-200); }
.blv-results-table th { font-weight: 700; background: var(--blv-gray-50); }
.blv-results-table tbody tr:hover { background: var(--blv-gray-50); }

/* ── Student Profile Card ─────────────────────────────────── */
.blv-profile-card {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    background: var(--blv-white);
    border: 1.5px solid var(--blv-gray-200);
    border-radius: var(--blv-radius-lg);
    padding: 20px 24px;
    box-shadow: var(--blv-shadow);
    margin-bottom: 4px;
}

.blv-profile-avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--blv-primary), #7c3aed);
    color: var(--blv-white);
    font-size: 1.4rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(37,99,235,.25);
}

.blv-profile-details { flex: 1; }

.blv-profile-name {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--blv-gray-800);
    margin-bottom: 12px;
    display: flex;
    align-items: baseline;
    gap: 8px;
    flex-wrap: wrap;
}

.blv-profile-meta-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 10px 20px;
}

.blv-profile-meta-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.blv-profile-meta-label {
    font-size: .7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--blv-gray-400);
}

.blv-profile-meta-value {
    font-size: .84rem;
    font-weight: 600;
    color: var(--blv-gray-700);
}

/* ── Anti-cheat: disable text selection during exam ──────── */
body.blv-exam-active {
    overflow: hidden !important;
}

.blv-exam-container {
    -webkit-user-select: none;
    -moz-user-select:    none;
    -ms-user-select:     none;
    user-select:         none;
}

/* Allow selection only inside short-answer textarea */
.blv-exam-container textarea,
.blv-exam-container input[type="text"] {
    -webkit-user-select: text;
    -moz-user-select:    text;
    user-select:         text;
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 768px) {
    .blv-login-card { padding: 28px 20px; }
    .blv-exam-body  { flex-direction: column; }
    .blv-nav-panel  { width: 100%; border-left: none; border-top: 1px solid var(--blv-gray-200); padding: 12px; }
    .blv-q-nav      { grid-template-columns: repeat(8, 1fr); }
    .blv-exam-title-bar { display: none; }
    .blv-exam-top-bar { padding: 10px 14px; }
    .blv-question-panel { padding: 16px; }
    .blv-question-text { font-size: .95rem; padding: 16px; }
    .blv-option-label   { padding: 12px 14px; }
    .blv-exam-grid      { grid-template-columns: 1fr; }
    .blv-modal-content  { padding: 20px 16px; }
}

@media (max-width: 480px) {
    .blv-form-row { flex-direction: column; }
    .blv-dash-header { gap: 10px; }
    .blv-timer { font-size: 1.1rem; min-width: 70px; }
    .blv-q-nav { grid-template-columns: repeat(6, 1fr); }
    .blv-profile-card { flex-direction: column; align-items: center; text-align: center; }
    .blv-profile-meta-grid { grid-template-columns: repeat(2,1fr); }
}