:root {
    --g-primary: #2457D6;
    --g-primary-dark: #1B3FA8;
    --g-primary-soft: #E8EEFB;
    --g-bg: #F5F7FB;
    --g-card: #FFFFFF;
    --g-text: #263248;
    --g-muted: #667085;
    --g-success: #16A34A;
    --g-warning: #F59E0B;
    --g-danger: #DC2626;
    --g-border: #E4E8F1;
    --g-sidebar: #16357A;
    --g-radius: 16px;
}

* { box-sizing: border-box; }

html, body {
    background: var(--g-bg);
    color: var(--g-text);
    font-family: "Pretendard", "Noto Sans KR", "Apple SD Gothic Neo", sans-serif;
    min-height: 100%;
}

a { color: var(--g-primary); text-decoration: none; }
a:hover { color: var(--g-primary-dark); }

.app-shell {
    min-height: 100vh;
    display: flex;
}

.app-sidebar {
    width: 260px;
    background: linear-gradient(180deg, #16357A 0%, #1C4AB0 100%);
    color: #fff;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
}

.brand {
    padding: 24px 20px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-mark {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: #fff;
    color: var(--g-primary);
    display: grid;
    place-items: center;
    font-weight: 800;
}

.brand-title { font-weight: 700; line-height: 1.2; }
.brand-sub { font-size: 12px; opacity: .75; }

.side-nav { padding: 8px 12px 24px; }
.side-nav a {
    display: flex;
    align-items: center;
    gap: 10px;
    color: rgba(255,255,255,.82);
    padding: 10px 12px;
    border-radius: 10px;
    margin-bottom: 4px;
}
.side-nav a:hover, .side-nav a.active {
    background: rgba(255,255,255,.14);
    color: #fff;
}

.app-main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.app-header {
    background: var(--g-card);
    border-bottom: 1px solid var(--g-border);
    padding: 14px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}
.app-content { padding: 24px; flex: 1; }
.app-footer {
    color: var(--g-muted);
    font-size: 13px;
    padding: 16px 24px 24px;
}

.page-title { font-size: 24px; font-weight: 700; margin-bottom: 4px; }
.page-desc { color: var(--g-muted); margin-bottom: 20px; }

.g-card {
    background: var(--g-card);
    border: 1px solid var(--g-border);
    border-radius: var(--g-radius);
    box-shadow: 0 8px 24px rgba(36, 87, 214, 0.05);
}

.stat-card {
    padding: 20px;
    height: 100%;
}
.stat-label { color: var(--g-muted); font-size: 13px; }
.stat-value { font-size: 32px; font-weight: 800; color: var(--g-primary); }

.badge-active { background: #DCFCE7; color: #166534; }
.badge-inactive { background: #FEE2E2; color: #991B1B; }
.badge-closed { background: #FEF3C7; color: #92400E; }

.user-chip { text-align: right; }
.user-chip .name { font-weight: 700; }
.user-chip .role { color: var(--g-muted); font-size: 13px; }

.login-wrap {
    min-height: 100vh;
    display: grid;
    place-items: center;
    background:
        radial-gradient(circle at top left, #dbe7ff 0, transparent 32%),
        radial-gradient(circle at bottom right, #e8f0ff 0, transparent 28%),
        var(--g-bg);
    padding: 24px;
}
.login-card { max-width: 440px; width: 100%; padding: 36px; }
.login-kicker { color: var(--g-primary); font-weight: 700; letter-spacing: .04em; }

.empty-state {
    text-align: center;
    padding: 48px 16px;
    color: var(--g-muted);
}
.empty-state i { font-size: 40px; color: var(--g-primary); }

.table thead th {
    color: var(--g-muted);
    font-weight: 600;
    font-size: 13px;
    background: #FAFBFF;
}

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

.form-control:focus, .form-select:focus {
    border-color: var(--g-primary);
    box-shadow: 0 0 0 .2rem rgba(36, 87, 214, .15);
}

.temp-password {
    background: #FFF7ED;
    border: 1px solid #FDBA74;
    color: #9A3412;
    border-radius: 12px;
    padding: 12px 16px;
}

.prompt-card { margin-bottom: 16px; padding: 16px; }
.prompt-card .help { font-size: 13px; color: var(--g-muted); margin-bottom: 8px; }
.char-count { font-size: 12px; color: var(--g-muted); text-align: right; }

.type-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 8px; }
.type-grid input { display: none; }
.type-grid label {
    display: block; padding: 12px 10px; border: 1px solid var(--g-border); border-radius: 12px;
    text-align: center; cursor: pointer; background: #fff; font-size: 14px;
}
.type-grid input:checked + label { border-color: var(--g-primary); background: var(--g-primary-soft); color: var(--g-primary); font-weight: 600; }

.tag-chip { display: inline-flex; align-items: center; gap: 4px; }
.check-row { display: flex; align-items: flex-start; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--g-border); }
.check-row input { width: 22px; height: 22px; margin-top: 2px; flex-shrink: 0; }
.check-done .task-text { text-decoration: line-through; color: var(--g-muted); }
.progress-thin { height: 8px; }

.feedback-box { background: #F8FAFF; border-left: 4px solid var(--g-primary); padding: 16px; border-radius: 12px; }
.student-answer { background: #fff; }

.subject-korean { background: #FEE2E2; color: #991B1B; }
.subject-english { background: #DBEAFE; color: #1D4ED8; }
.subject-math { background: #EDE9FE; color: #6D28D9; }
.subject-science { background: #DCFCE7; color: #166534; }
.subject-social { background: #FFEDD5; color: #9A3412; }
.subject-history { background: #FEF3C7; color: #92400E; }
.subject-reading { background: #E0E7FF; color: #3730A3; }
.subject-info { background: #CFFAFE; color: #0E7490; }
.subject-etc { background: #E2E8F0; color: #334155; }

.region-canvas { position: relative; display: inline-block; max-width: 100%; }
.region-canvas img { max-width: 100%; height: auto; }
.region-box { position: absolute; border: 2px solid #2457D6; background: rgba(36,87,214,.15); pointer-events: none; }
.ai-note { background: #FFF7ED; border: 1px solid #FDBA74; color: #9A3412; padding: 12px 16px; border-radius: 12px; }

.status-draft { background: #E2E8F0; color: #334155; }
.status-submitted { background: #FEF3C7; color: #92400E; }
.status-reviewed { background: #DCFCE7; color: #166534; }

.file-preview { max-width: 160px; max-height: 120px; object-fit: cover; border-radius: 10px; }

.image-paste-zone {
    border: 1px dashed var(--g-border);
    border-radius: 12px;
    padding: 12px;
    background: #F8FAFC;
    min-height: 132px;
    cursor: pointer;
    outline: none;
}
.image-paste-zone:focus,
.image-paste-zone.is-active {
    border-color: var(--g-primary);
    box-shadow: 0 0 0 3px rgba(36, 87, 214, 0.15);
    background: #F3F6FD;
}
.image-paste-zone.is-dragover {
    border-color: var(--g-primary);
    background: var(--g-primary-soft);
}
.image-paste-preview {
    display: block;
    max-width: 100%;
    max-height: 180px;
    object-fit: contain;
    border-radius: 8px;
    margin-top: 8px;
    background: #fff;
}

@media (max-width: 991.98px) {
    .app-shell { display: block; }
    .app-sidebar { display: none; }
    .app-content { padding: 16px; padding-bottom: 88px; }
    .type-grid { grid-template-columns: repeat(2, 1fr); }
    .btn, .form-control, .form-select { min-height: 44px; }
    .sticky-action, .sticky-actions {
        position: sticky;
        bottom: 12px;
        z-index: 5;
    }
}
.mobile-cards { display: none; }
@media (max-width: 991.98px) {
    .mobile-cards { display: block; }
}
.mobile-empty { padding: 24px 8px; color: var(--g-muted); }
@media (max-width: 991.98px) {
    .table-responsive { overflow-x: auto; }
    .page-title { font-size: 1.35rem; }
}
.consent-box { border: 1px solid var(--g-border); border-radius: 12px; padding: 10px 12px; }
.onboarding-steps { padding-left: 1.2rem; }
input[type="file"] { min-height: 44px; }

.qr-card-image {
    display: inline-block;
    width: 400px;
    max-width: 100%;
    height: auto;
    background: #fff;
    padding: 16px;
    border-radius: 8px;
}

.exam-score-head,
.exam-score-item {
    display: grid;
    gap: 8px;
    align-items: center;
}
.exam-score-item {
    border: 1px solid var(--g-border);
    border-radius: 12px;
    padding: 12px;
    margin-bottom: 10px;
}
.exam-chart-wrap { height: 220px; max-width: 100%; overflow: hidden; }

@media (min-width: 768px) {
    .exam-score-head,
    .exam-score-item {
        grid-template-columns: 1.2fr 1fr 1.1fr 0.8fr auto;
    }
    .exam-score-head {
        font-size: 13px;
        color: var(--g-muted);
        font-weight: 600;
        padding: 0 12px 8px;
    }
    .exam-score-item {
        border: none;
        border-bottom: 1px solid var(--g-border);
        border-radius: 0;
        margin-bottom: 0;
        padding: 10px 12px;
    }
}

@media print {
    .app-sidebar, .app-header, .app-footer, .offcanvas, .qr-card-actions { display: none !important; }
    .app-shell, .app-main, .app-content { display: block; background: #fff; }
    .qr-card-image { width: 400px; height: 400px; }
}