:root {
    --bg-dark: #090d16;
    --bg-surface: #0f172a;
    --bg-card: #1e293b;
    --bg-card-hover: #27354f;
    --border: #334155;
    --border-light: #475569;
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --primary-glow: rgba(59, 130, 246, 0.25);
    
    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.12);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.12);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.12);
    --info: #06b6d4;
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    
    --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* =========================================================
   GİRİŞ SAYFASI (LOGIN)
========================================================= */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
    background: radial-gradient(circle at top, #1e1b4b 0%, var(--bg-dark) 70%);
}

.login-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
    width: 100%;
    max-width: 440px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
}

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

.logo-badge {
    display: inline-block;
    padding: 6px 14px;
    background: var(--primary-glow);
    color: #60a5fa;
    border-radius: 30px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 14px;
    border: 1px solid rgba(96, 165, 250, 0.2);
}

.login-header h1 {
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 13px;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea,
.form-select {
    width: 100%;
    padding: 11px 14px;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14px;
    transition: all 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.login-footer {
    text-align: center;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.link-subtle {
    color: var(--text-muted);
    font-size: 13px;
    text-decoration: none;
    transition: color 0.2s;
}

.link-subtle:hover {
    color: var(--primary);
}

/* =========================================================
   NAVİGASYON & LAYOUT
========================================================= */
.top-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 20px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    padding: 6px 10px;
    border-radius: var(--radius-sm);
}

.brand-title {
    font-weight: 800;
    font-size: 17px;
    letter-spacing: -0.5px;
}

.role-badge {
    font-size: 11px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.role-admin {
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.role-instructor {
    background: rgba(59, 130, 246, 0.15);
    color: #60a5fa;
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 20px;
}

.dept-selector-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
}

.dept-selector-wrapper label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 600;
}

.dept-selector-wrapper select {
    min-width: 200px;
    padding: 7px 12px;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-left: 16px;
    border-left: 1px solid var(--border);
}

.user-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

.dashboard-layout {
    display: flex;
    min-height: calc(100vh - 61px);
}

.sidebar {
    width: 240px;
    background: var(--bg-surface);
    border-right: 1px solid var(--border);
    padding: 20px 12px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 10px 14px;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    text-align: left;
    transition: all 0.2s ease;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--primary-glow);
    color: #60a5fa;
    font-weight: 700;
}

.preview-link {
    display: block;
    text-align: center;
    padding: 10px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px dashed var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 12px;
    font-weight: 600;
    transition: all 0.2s;
}

.preview-link:hover {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--primary);
    color: #93c5fd;
}

.main-content {
    flex: 1;
    padding: 32px;
    overflow-y: auto;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
    animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* =========================================================
   PANE HEADERS & KARTLAR
========================================================= */
.pane-header {
    margin-bottom: 24px;
}

.pane-header h2 {
    font-size: 24px;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 4px;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.stat-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: transform 0.2s, border-color 0.2s;
}

.stat-card:hover {
    transform: translateY(-2px);
    border-color: var(--border-light);
}

.stat-icon {
    font-size: 24px;
    padding: 12px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-blue { background: rgba(59, 130, 246, 0.15); }
.icon-purple { background: rgba(139, 92, 246, 0.15); }
.icon-green { background: rgba(16, 185, 129, 0.15); }
.icon-amber { background: rgba(245, 158, 11, 0.15); }
.icon-rose { background: rgba(239, 68, 68, 0.15); }

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
    margin-top: 2px;
}

.card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.01);
}

.card-header h3 {
    font-size: 16px;
    font-weight: 700;
}

.card-body {
    padding: 20px;
}

.mt-4 { margin-top: 24px; }
.mb-4 { margin-bottom: 24px; }

/* =========================================================
   TABLOLAR
========================================================= */
.table-responsive {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13.5px;
    text-align: left;
}

.data-table th {
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-secondary);
    font-weight: 700;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    text-transform: uppercase;
    font-size: 11px;
    letter-spacing: 0.5px;
}

.data-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
}

.data-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

/* =========================================================
   DURUM ROZETLERİ (STATUS PILLS)
========================================================= */
.status-pill {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
}

.status-completed {
    background: var(--success-bg);
    color: #34d399;
}

.status-progress {
    background: var(--warning-bg);
    color: #fbbf24;
}

.status-notstarted {
    background: rgba(148, 163, 184, 0.1);
    color: #94a3b8;
}

/* =========================================================
   BUTONLAR
========================================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 13.5px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 0 15px var(--primary-glow);
}

.btn-success {
    background: var(--success);
    color: #fff;
}

.btn-success:hover {
    background: #059669;
}

.btn-danger {
    background: var(--danger);
    color: #fff;
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-secondary {
    background: var(--border);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--border-light);
}

.btn-outline-danger {
    background: transparent;
    border: 1px solid var(--danger);
    color: #f87171;
}

.btn-outline-danger:hover {
    background: var(--danger-bg);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-block {
    width: 100%;
}

.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

/* =========================================================
   SORU LİSTESİ KARTLARI
========================================================= */
.questions-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.question-item {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
}

.q-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.q-badge {
    background: var(--primary-glow);
    color: #60a5fa;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 12px;
}

.q-title {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 12px;
}

.q-code {
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 14px;
    font-family: var(--font-mono);
    font-size: 12.5px;
    margin-bottom: 14px;
    overflow-x: auto;
    color: #38bdf8;
    white-space: pre;
}

.q-options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 12px;
}

.q-opt {
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
}

.q-opt.correct {
    background: var(--success-bg);
    border-color: rgba(16, 185, 129, 0.4);
    color: #34d399;
    font-weight: 600;
}

.q-exp {
    font-size: 12px;
    color: var(--text-muted);
    font-style: italic;
    border-top: 1px solid var(--border);
    padding-top: 10px;
}

/* =========================================================
   MODALLAR
========================================================= */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal-overlay.hidden {
    display: none;
}

.modal-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 520px;
    padding: 28px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.7);
    animation: modalPop 0.2s ease;
}

@keyframes modalPop {
    from { transform: scale(0.95); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 800;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    line-height: 1;
}

.modal-desc {
    color: var(--text-secondary);
    font-size: 13px;
    margin-bottom: 14px;
}

.template-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(59, 130, 246, 0.08);
    border: 1px solid rgba(59, 130, 246, 0.2);
    padding: 10px 14px;
    border-radius: var(--radius-md);
    font-size: 12.5px;
}

.link-download {
    color: #60a5fa;
    text-decoration: underline;
    font-weight: 600;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 24px;
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 150px;
    overflow-y: auto;
    padding: 8px;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    cursor: pointer;
}

/* =========================================================
   BİLDİRİM TOAST & ALERT
========================================================= */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    padding: 12px 20px;
    background: #1e293b;
    color: #fff;
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-md);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    font-size: 13.5px;
    font-weight: 600;
    z-index: 2000;
    transition: all 0.3s ease;
}

.toast.toast-success { border-color: var(--success); }
.toast.toast-danger { border-color: var(--danger); }
.toast.hidden { transform: translateY(100px); opacity: 0; pointer-events: none; }

.alert {
    padding: 10px 14px;
    border-radius: var(--radius-md);
    font-size: 13px;
    margin-bottom: 16px;
}

.alert-success { background: var(--success-bg); color: #34d399; }
.alert-danger { background: var(--danger-bg); color: #f87171; }
.alert.hidden { display: none; }