/* ============================================================
   JelloSmart ExamSystem — Akademik Modernizm Design System
   ============================================================ */

/* =========================
   1. CSS CUSTOM PROPERTIES
   ========================= */
:root {
    /* Ana Renkler */
    --color-primary:        #2563EB;
    --color-primary-dark:   #1D4ED8;
    --color-primary-light:  #DBEAFE;
    --color-primary-xlight: #EFF6FF;

    /* Rol Aksan Renkleri */
    --color-admin:          #7C3AED;
    --color-teacher:        #0891B2;
    --color-student:        #059669;

    /* Durum Renkleri */
    --color-success:        #10B981;
    --color-warning:        #F59E0B;
    --color-danger:         #EF4444;
    --color-info:           #3B82F6;

    /* Nötr Palet */
    --color-gray-50:        #F9FAFB;
    --color-gray-100:       #F3F4F6;
    --color-gray-200:       #E5E7EB;
    --color-gray-300:       #D1D5DB;
    --color-gray-400:       #9CA3AF;
    --color-gray-500:       #6B7280;
    --color-gray-600:       #4B5563;
    --color-gray-700:       #374151;
    --color-gray-800:       #1F2937;
    --color-gray-900:       #111827;

    /* Yüzeyler */
    --surface-bg:           #F8FAFC;
    --surface-card:         #FFFFFF;
    --surface-sidebar:      #1E293B;
    --surface-sidebar-hover:#334155;
    --surface-topbar:       #FFFFFF;

    /* Tipografi */
    --font-display:         'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body:            'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono:            'JetBrains Mono', ui-monospace, 'SF Mono', monospace;

    /* Boyutlar */
    --radius-sm:    4px;
    --radius-md:    8px;
    --radius-lg:    12px;
    --radius-xl:    16px;
    --radius-2xl:   20px;
    --radius-full:  9999px;

    --shadow-sm:    0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md:    0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --shadow-lg:    0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.05);
    --shadow-xl:    0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.05);

    /* Geçişler */
    --transition-fast:      150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal:    250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow:      400ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Layout */
    --sidebar-width:        260px;
    --sidebar-collapsed:    72px;
    --topbar-height:        64px;

    /* Spacing */
    --space-1:      4px;
    --space-2:      8px;
    --space-3:      12px;
    --space-4:      16px;
    --space-5:      20px;
    --space-6:      24px;
    --space-8:      32px;
    --space-10:     40px;
    --space-12:     48px;
}

/* =========================
   2. RESET & BASE
   ========================= */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-gray-800);
    background: var(--surface-bg);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-gray-900);
    letter-spacing: -0.015em;
}

h1 { font-size: 1.875rem; font-weight: 800; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover { color: var(--color-primary-dark); }

::selection {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
}

/* =========================
   3. APP LAYOUT
   ========================= */
.app-wrapper {
    display: flex;
    min-height: 100vh;
    background: var(--surface-bg);
}

.main-container {
    flex: 1;
    min-width: 0;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    transition: margin-left var(--transition-normal);
}

.content {
    flex: 1;
    padding: var(--space-8);
    background: var(--surface-bg);
    min-height: calc(100vh - var(--topbar-height) - 60px);
}

/* =========================
   4. SIDEBAR
   ========================= */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--surface-sidebar);
    z-index: 100;
    display: flex;
    flex-direction: column;
    transition: width var(--transition-normal);
    overflow: hidden;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-4);
    height: var(--topbar-height);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    flex-shrink: 0;
    overflow: hidden;
}

.sidebar-logo-img {
    display: block;
    user-select: none;
    pointer-events: none;
}

.sidebar-logo-full {
    height: 44px;
    width: auto;
    max-width: 100%;
}

.sidebar-logo-mini {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: contain;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4) var(--space-3);
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.sidebar-nav::-webkit-scrollbar { width: 4px; }
.sidebar-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }

.nav-section-label {
    padding: var(--space-4) var(--space-4) var(--space-2);
    font-size: 0.6875rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.35);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: 10px var(--space-4);
    color: rgba(255, 255, 255, 0.65);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
    cursor: pointer;
}

.nav-item .nav-icon {
    font-size: 1.125rem;
    width: 20px;
    text-align: center;
    flex-shrink: 0;
    opacity: 0.85;
}

.nav-item:hover {
    color: white;
    background: var(--surface-sidebar-hover);
    text-decoration: none;
}

.nav-item.active {
    color: white;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}

.nav-item.active .nav-icon { opacity: 1; }

.sidebar-footer {
    padding: var(--space-4);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    flex-shrink: 0;
}

.sidebar-user-mini {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2);
    border-radius: var(--radius-md);
    color: rgba(255, 255, 255, 0.75);
}

.sidebar-user-mini .avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8125rem;
    flex-shrink: 0;
}

.sidebar-user-mini .info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.sidebar-user-mini .name {
    font-size: 0.8125rem;
    font-weight: 600;
    color: white;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-user-mini .email {
    font-size: 0.6875rem;
    color: rgba(255, 255, 255, 0.45);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Sidebar collapsed (desktop) */
@media (min-width: 1025px) {
    body.sidebar-collapsed .sidebar { width: var(--sidebar-collapsed); }
    body.sidebar-collapsed .main-container { margin-left: var(--sidebar-collapsed); }
    body.sidebar-collapsed .sidebar-logo-full { display: none; }
    body.sidebar-collapsed .sidebar-logo-mini { display: block; }
    body.sidebar-collapsed .sidebar-logo { padding: var(--space-3) 0; }
    body.sidebar-collapsed .sidebar-nav { padding: var(--space-4) 8px; }
    body.sidebar-collapsed .nav-item { justify-content: center; padding: 10px 0; gap: 0; }
    body.sidebar-collapsed .nav-item > span { display: none; }
    body.sidebar-collapsed .nav-item .nav-icon { font-size: 1.25rem; }
    body.sidebar-collapsed .nav-section-label { display: none; }
    body.sidebar-collapsed .sidebar-footer { padding: var(--space-3) 0; }
    body.sidebar-collapsed .sidebar-user-mini { justify-content: center; gap: 0; }
    body.sidebar-collapsed .sidebar-user-mini .info { display: none; }
}

/* =========================
   5. TOPBAR
   ========================= */
.topbar {
    height: var(--topbar-height);
    background: var(--surface-topbar);
    border-bottom: 1px solid var(--color-gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-8);
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(8px);
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.topbar-toggle {
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    color: var(--color-gray-600);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.topbar-toggle:hover {
    background: var(--color-gray-50);
    color: var(--color-gray-800);
}

.topbar-breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.8125rem;
    color: var(--color-gray-500);
}

.topbar-breadcrumb a {
    color: var(--color-gray-500);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.topbar-breadcrumb a:hover { color: var(--color-primary); }

.topbar-breadcrumb .separator {
    color: var(--color-gray-300);
    font-size: 0.75rem;
}

.topbar-breadcrumb .current {
    color: var(--color-gray-900);
    font-weight: 600;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* Search box */
.topbar-search {
    position: relative;
    min-width: 280px;
    margin-right: var(--space-3);
}

.topbar-search input {
    width: 100%;
    height: 38px;
    padding: 0 var(--space-3) 0 var(--space-10);
    border: 1px solid var(--color-gray-200);
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    color: var(--color-gray-800);
    font-family: var(--font-body);
    transition: all var(--transition-fast);
}

.topbar-search input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--surface-card);
    box-shadow: 0 0 0 3px var(--color-primary-xlight);
}

.topbar-search i {
    position: absolute;
    left: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-gray-400);
    font-size: 0.9375rem;
    pointer-events: none;
}

/* Icon button (notifications etc) */
.topbar-icon-btn {
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    color: var(--color-gray-600);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.topbar-icon-btn i { font-size: 1.125rem; }

.topbar-icon-btn:hover {
    background: var(--color-gray-100);
    color: var(--color-gray-900);
}

.notification-dot {
    position: absolute;
    top: 8px;
    right: 9px;
    width: 8px;
    height: 8px;
    background: var(--color-danger);
    border-radius: var(--radius-full);
    border: 2px solid var(--surface-card);
}

/* User avatar in topbar */
.user-menu-trigger {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 4px 4px 4px var(--space-3);
    background: transparent;
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-left: var(--space-2);
}

.user-menu-trigger:hover {
    background: var(--color-gray-50);
    border-color: var(--color-gray-300);
}

.user-menu-trigger .user-name-text {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-gray-800);
    line-height: 1.2;
}

.user-menu-trigger .user-role-text {
    font-size: 0.6875rem;
    color: var(--color-gray-500);
    line-height: 1.2;
    text-align: left;
}

.user-menu-trigger .user-name-block {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.user-menu-trigger .avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-admin) 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
}

/* =========================
   6. DROPDOWN (custom)
   ========================= */
.dropdown-menu {
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--space-2);
    font-size: 0.875rem;
    min-width: 240px;
}

.dropdown-header-box {
    padding: var(--space-3);
    border-bottom: 1px solid var(--color-gray-100);
    margin-bottom: var(--space-2);
}

.dropdown-header-box .name {
    font-weight: 700;
    color: var(--color-gray-900);
    font-size: 0.875rem;
}

.dropdown-header-box .email {
    font-size: 0.75rem;
    color: var(--color-gray-500);
    margin-top: 2px;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    font-size: 0.8125rem;
    color: var(--color-gray-700);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    font-weight: 500;
}

.dropdown-item i {
    width: 16px;
    font-size: 0.9375rem;
    color: var(--color-gray-500);
}

.dropdown-item:hover {
    background: var(--color-gray-50);
    color: var(--color-gray-900);
}

.dropdown-item.danger {
    color: var(--color-danger);
}

.dropdown-item.danger i { color: var(--color-danger); }

.dropdown-item.danger:hover {
    background: #FEF2F2;
    color: var(--color-danger);
}

.dropdown-divider {
    border: 0;
    height: 1px;
    background: var(--color-gray-100);
    margin: var(--space-2) 0;
}

/* =========================
   7. PAGE HEADER
   ========================= */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-8);
    gap: var(--space-6);
    flex-wrap: wrap;
}

.page-header-content h1 {
    font-size: 1.625rem;
    font-weight: 800;
    margin-bottom: var(--space-1);
}

.page-header-content p {
    color: var(--color-gray-500);
    font-size: 0.875rem;
}

.page-header-actions {
    display: flex;
    gap: var(--space-3);
}

/* =========================
   8. CARDS
   ========================= */
.card {
    background: var(--surface-card);
    border: 1px solid var(--color-gray-100);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: box-shadow var(--transition-normal), transform var(--transition-fast);
}

.card:hover { box-shadow: var(--shadow-md); }

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--color-gray-100);
    background: transparent;
}

.card-header h5,
.card-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.9375rem;
    color: var(--color-gray-900);
    margin: 0;
}

.card-header-subtitle {
    font-size: 0.75rem;
    color: var(--color-gray-500);
    margin-top: 2px;
}

.card-body { padding: var(--space-6); }

/* Stat card */
.stat-card {
    background: var(--surface-card);
    border: 1px solid var(--color-gray-100);
    border-radius: var(--radius-lg);
    padding: var(--space-5) var(--space-6);
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--color-gray-200);
}

.stat-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--stat-color, var(--color-primary));
    opacity: 0.85;
}

.stat-card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: color-mix(in srgb, var(--stat-color, var(--color-primary)) 12%, transparent);
    color: var(--stat-color, var(--color-primary));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.375rem;
}

.stat-card-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.stat-card-value {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.75rem;
    color: var(--color-gray-900);
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.stat-card-label {
    font-size: 0.8125rem;
    color: var(--color-gray-500);
    font-weight: 500;
    margin-top: var(--space-1);
}

.stat-card-trend {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    margin-top: var(--space-2);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 3px var(--space-2);
    border-radius: var(--radius-full);
    width: fit-content;
}

.stat-card-trend.up {
    background: #D1FAE5;
    color: #065F46;
}

.stat-card-trend.down {
    background: #FEE2E2;
    color: #991B1B;
}

/* Role icon color variants */
.text-admin   { color: var(--color-admin); }
.text-teacher { color: var(--color-teacher); }
.text-student { color: var(--color-student); }

/* =========================
   9. BUTTONS
   ========================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 9px var(--space-4);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.8125rem;
    line-height: 1.25;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn i { font-size: 0.9375rem; }

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: white;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
}

.btn-outline {
    background: transparent;
    color: var(--color-gray-700);
    border-color: var(--color-gray-200);
}

.btn-outline:hover {
    background: var(--color-gray-50);
    color: var(--color-gray-900);
    border-color: var(--color-gray-300);
}

.btn-danger {
    background: var(--color-danger);
    color: white;
    border-color: var(--color-danger);
}

.btn-danger:hover { background: #DC2626; border-color: #DC2626; }

.btn-success {
    background: var(--color-success);
    color: white;
    border-color: var(--color-success);
}

.btn-sm { padding: 6px var(--space-3); font-size: 0.75rem; }
.btn-lg { padding: 12px var(--space-6); font-size: 0.9375rem; }

/* =========================
   10. FORMS
   ========================= */
.form-group { margin-bottom: var(--space-5); }

.form-label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-gray-700);
    margin-bottom: var(--space-2);
}

.form-control,
.form-select {
    width: 100%;
    padding: 10px var(--space-4);
    border: 1.5px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 0.875rem;
    color: var(--color-gray-900);
    background: var(--surface-card);
    transition: all var(--transition-fast);
}

.form-control:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-xlight);
}

.form-control::placeholder { color: var(--color-gray-400); }

textarea.form-control { min-height: 120px; resize: vertical; }

.form-hint {
    font-size: 0.75rem;
    color: var(--color-gray-500);
    margin-top: var(--space-1);
}

.text-danger {
    color: var(--color-danger);
    font-size: 0.75rem;
    font-weight: 500;
    margin-top: var(--space-1);
    display: block;
}

/* =========================
   11. TABLES
   ========================= */
.table {
    width: 100%;
    border-collapse: collapse;
}

.table thead th {
    background: var(--color-gray-50);
    padding: var(--space-3) var(--space-4);
    text-align: left;
    font-size: 0.6875rem;
    font-weight: 700;
    color: var(--color-gray-600);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    border-bottom: 1px solid var(--color-gray-200);
}

.table tbody td {
    padding: var(--space-4);
    font-size: 0.875rem;
    color: var(--color-gray-800);
    border-bottom: 1px solid var(--color-gray-100);
    vertical-align: middle;
}

.table tbody tr {
    transition: background var(--transition-fast);
}

.table tbody tr:hover { background: var(--color-gray-50); }
.table tbody tr:last-child td { border-bottom: none; }

/* =========================
   12. BADGES
   ========================= */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px var(--space-2);
    font-size: 0.6875rem;
    font-weight: 700;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.badge-primary { background: var(--color-primary-light); color: var(--color-primary-dark); }
.badge-success { background: #D1FAE5; color: #065F46; }
.badge-warning { background: #FEF3C7; color: #92400E; }
.badge-danger  { background: #FEE2E2; color: #991B1B; }
.badge-gray    { background: var(--color-gray-100); color: var(--color-gray-700); }
.badge-admin   { background: #EDE9FE; color: #5B21B6; }
.badge-teacher { background: #CFFAFE; color: #155E75; }
.badge-student { background: #D1FAE5; color: #065F46; }

/* =========================
   13. FOOTER
   ========================= */
.footer {
    padding: var(--space-5) var(--space-8);
    background: var(--surface-card);
    border-top: 1px solid var(--color-gray-100);
    font-size: 0.8125rem;
    color: var(--color-gray-500);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.footer a {
    color: var(--color-gray-600);
    font-weight: 500;
}

.footer a:hover { color: var(--color-primary); }

/* =========================
   14. LOGIN PAGE
   ========================= */
.login-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr;
    background: var(--surface-bg);
}

@media (min-width: 900px) {
    .login-shell { grid-template-columns: 1fr 1fr; }
}

.login-form-side {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-8);
}

.login-form-box {
    width: 100%;
    max-width: 400px;
}

.login-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-12);
}

.login-brand-logo {
    height: 56px;
    width: auto;
    display: block;
    user-select: none;
}

.login-title {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: var(--space-2);
}

.login-subtitle {
    color: var(--color-gray-500);
    font-size: 0.9375rem;
    margin-bottom: var(--space-8);
}

.login-form .form-group { margin-bottom: var(--space-4); }

.login-form-extras {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-6);
    font-size: 0.8125rem;
}

.login-remember {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-gray-600);
    cursor: pointer;
}

.login-form .btn-primary {
    width: 100%;
    padding: 12px;
    font-size: 0.9375rem;
    justify-content: center;
}

.login-side-panel {
    display: none;
    background: linear-gradient(135deg, #1E293B 0%, #312E81 50%, #4C1D95 100%);
    position: relative;
    overflow: hidden;
    padding: var(--space-12);
    color: white;
}

@media (min-width: 900px) {
    .login-side-panel { display: flex; flex-direction: column; justify-content: center; }
}

.login-side-panel::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -30%;
    width: 60%;
    height: 60%;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.4) 0%, transparent 70%);
    border-radius: 50%;
}

.login-side-panel::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -20%;
    width: 60%;
    height: 60%;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.3) 0%, transparent 70%);
    border-radius: 50%;
}

.login-side-content {
    position: relative;
    z-index: 1;
    max-width: 460px;
    margin: 0 auto;
}

.login-side-content h2 {
    color: white;
    font-size: 2.25rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--space-4);
}

.login-side-content p {
    color: rgba(255, 255, 255, 0.75);
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: var(--space-8);
}

.login-feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.login-feature-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.9375rem;
}

.login-feature-list li i {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.9375rem;
    flex-shrink: 0;
}

.login-error {
    padding: var(--space-3) var(--space-4);
    background: #FEF2F2;
    border: 1px solid #FECACA;
    border-radius: var(--radius-md);
    color: #991B1B;
    font-size: 0.8125rem;
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* =========================
   15. UTILITIES
   ========================= */
.d-flex { display: flex; }
.flex-column { flex-direction: column; }
.align-items-center { align-items: center; }
.justify-content-between { justify-content: space-between; }
.justify-content-center { justify-content: center; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.text-muted { color: var(--color-gray-500); }
.text-center { text-align: center; }
.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mt-4 { margin-top: var(--space-4); }
.w-100 { width: 100%; }

/* Grid helpers */
.grid { display: grid; gap: var(--space-5); }
.grid-cols-1 { grid-template-columns: 1fr; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1200px) {
    .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 { grid-template-columns: 1fr; }
}

/* =========================
   16. RESPONSIVE
   ========================= */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
        box-shadow: var(--shadow-xl);
    }
    .sidebar.open { transform: translateX(0); }
    .main-container { margin-left: 0; }
    .topbar-search { min-width: 200px; }
}

@media (max-width: 640px) {
    .content { padding: var(--space-4); }
    .topbar { padding: 0 var(--space-4); }
    .topbar-search { display: none; }
    .user-menu-trigger .user-name-block { display: none; }
    .page-header { flex-direction: column; align-items: flex-start; }
}

/* =========================
   17. ANIMATIONS
   ========================= */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.content > * {
    animation: fadeIn 300ms ease-out;
}

/* =========================
   18. EMPTY STATES
   ========================= */
.empty-state {
    padding: var(--space-12) var(--space-6);
    text-align: center;
    color: var(--color-gray-500);
}

.empty-state i {
    font-size: 3rem;
    color: var(--color-gray-300);
    margin-bottom: var(--space-3);
    display: block;
}

.empty-state h4 {
    color: var(--color-gray-700);
    font-size: 1rem;
    margin-bottom: var(--space-2);
}

.empty-state p {
    font-size: 0.875rem;
    color: var(--color-gray-500);
    max-width: 360px;
    margin: 0 auto;
}

/* =========================
   AVATAR (image variant — initials default kalır)
   ========================= */
.avatar.avatar-img {
    padding: 0;
    overflow: hidden;
    background: var(--color-gray-100);
}

.avatar.avatar-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* ============================================================
   Help Page (Kullanım Kılavuzu)
   ============================================================ */
.help-page {
    max-width: 1280px;
    margin: 0 auto;
    padding: 16px 24px 80px;
}

.help-grid {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 32px;
    align-items: start;
}

/* --- Mobile TOC (collapsible) --- */
.help-toc-mobile {
    display: none;
    grid-column: 1 / -1;
    background: var(--color-white, #fff);
    border: 1px solid var(--color-gray-200, #e5e7eb);
    border-radius: 8px;
    padding: 12px 16px;
    margin-bottom: 16px;
}

.help-toc-mobile > summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--color-gray-900, #111827);
    list-style: none;
}

.help-toc-mobile > summary::-webkit-details-marker { display: none; }

.help-toc-mobile > summary::before {
    content: "\F282"; /* bi-chevron-right */
    font-family: "bootstrap-icons";
    margin-right: 8px;
    transition: transform 0.2s;
    display: inline-block;
}

.help-toc-mobile[open] > summary::before { transform: rotate(90deg); }

.help-toc-mobile .help-toc-list {
    margin-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.help-toc-mobile .help-toc-list a {
    color: var(--color-gray-700, #374151);
    text-decoration: none;
    padding: 6px 8px;
    border-radius: 6px;
}

.help-toc-mobile .help-toc-list a:hover { background: var(--color-gray-100, #f3f4f6); }

/* --- Desktop sticky TOC --- */
.help-toc {
    position: sticky;
    top: 80px;
    align-self: start;
    background: var(--color-white, #fff);
    border: 1px solid var(--color-gray-200, #e5e7eb);
    border-radius: 8px;
    padding: 16px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
}

.help-toc-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-gray-500, #6b7280);
    margin-bottom: 12px;
}

.help-toc-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.help-toc-list > a {
    color: var(--color-gray-900, #111827);
    text-decoration: none;
    font-weight: 600;
    padding: 8px 10px;
    border-radius: 6px;
    border-left: 3px solid transparent;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.help-toc-list > a:hover { background: var(--color-gray-50, #f9fafb); }

.help-toc-list > a.active {
    background: var(--color-primary-50, #eff6ff);
    color: var(--color-primary, #2563eb);
    border-left-color: var(--color-primary, #2563eb);
}

.help-toc-list ul {
    list-style: none;
    padding-left: 12px;
    margin: 4px 0 8px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    border-left: 1px solid var(--color-gray-200, #e5e7eb);
}

.help-toc-list ul a {
    display: block;
    color: var(--color-gray-600, #4b5563);
    text-decoration: none;
    font-size: 0.875rem;
    padding: 4px 10px;
    border-radius: 4px;
}

.help-toc-list ul a:hover { background: var(--color-gray-50, #f9fafb); color: var(--color-gray-900, #111827); }

.help-toc-list ul a.active { color: var(--color-primary, #2563eb); font-weight: 600; }

/* --- Content --- */
.help-content {
    background: var(--color-white, #fff);
    border: 1px solid var(--color-gray-200, #e5e7eb);
    border-radius: 12px;
    padding: 32px 40px;
}

.help-header {
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--color-gray-200, #e5e7eb);
}

.help-header h1 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--color-gray-900, #111827);
    margin: 0 0 8px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.help-header h1 i { color: var(--color-primary, #2563eb); }

.help-subtitle {
    color: var(--color-gray-600, #4b5563);
    margin: 0;
    font-size: 1rem;
}

.help-section {
    margin-top: 48px;
    scroll-margin-top: 80px;
}

.help-section:first-of-type { margin-top: 0; }

.help-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-gray-900, #111827);
    margin: 0 0 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.help-section h2 i { color: var(--color-primary, #2563eb); font-size: 1.25rem; }

.help-section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-gray-900, #111827);
    margin: 32px 0 12px;
    scroll-margin-top: 80px;
}

.help-section p {
    color: var(--color-gray-700, #374151);
    line-height: 1.7;
    margin: 0 0 12px;
}

.help-section ol, .help-section ul {
    color: var(--color-gray-700, #374151);
    line-height: 1.7;
    padding-left: 24px;
}

.help-section li { margin-bottom: 6px; }

.help-section code {
    background: var(--color-gray-100, #f3f4f6);
    color: var(--color-gray-900, #111827);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.875em;
    font-family: "JetBrains Mono", monospace;
}

/* --- Step cards --- */
.help-steps {
    list-style: none;
    padding: 0;
    counter-reset: help-step;
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin: 16px 0;
}

.help-steps li {
    counter-increment: help-step;
    background: var(--color-gray-50, #f9fafb);
    border-left: 3px solid var(--color-primary, #2563eb);
    padding: 12px 16px 12px 48px;
    border-radius: 6px;
    position: relative;
}

.help-steps li::before {
    content: counter(help-step);
    position: absolute;
    left: 12px;
    top: 12px;
    width: 24px;
    height: 24px;
    background: var(--color-primary, #2563eb);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
}

/* --- Callouts --- */
.help-callout {
    border-radius: 8px;
    padding: 12px 16px;
    margin: 16px 0;
    border-left: 4px solid;
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.help-callout i { font-size: 1.125rem; margin-top: 2px; }

.help-callout--info    { background: #eff6ff; border-color: #2563eb; color: #1e3a8a; }
.help-callout--tip     { background: #ecfdf5; border-color: #10b981; color: #065f46; }
.help-callout--warning { background: #fffbeb; border-color: #f59e0b; color: #92400e; }

.help-callout strong { display: block; margin-bottom: 4px; }

/* --- Module card --- */
.help-module {
    border: 1px solid var(--color-gray-200, #e5e7eb);
    border-radius: 8px;
    padding: 20px;
    margin: 16px 0;
}

.help-module h3 { margin-top: 0; }

.help-module-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 8px 0 12px;
}

.help-module-meta .badge {
    font-size: 0.75rem;
    padding: 4px 10px;
    border-radius: 999px;
    background: var(--color-gray-100, #f3f4f6);
    color: var(--color-gray-700, #374151);
    font-weight: 500;
}

.help-module-meta .badge--admin    { background: #f3e8ff; color: #6b21a8; }
.help-module-meta .badge--teacher  { background: #dbeafe; color: #1e40af; }

/* --- FAQ --- */
.help-faq details {
    border: 1px solid var(--color-gray-200, #e5e7eb);
    border-radius: 8px;
    padding: 12px 16px;
    margin-bottom: 8px;
    background: var(--color-white, #fff);
}

.help-faq summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--color-gray-900, #111827);
}

.help-faq summary::-webkit-details-marker { display: none; }

.help-faq summary::before {
    content: "\F282";
    font-family: "bootstrap-icons";
    margin-right: 8px;
    display: inline-block;
    transition: transform 0.2s;
}

.help-faq details[open] summary::before { transform: rotate(90deg); }

.help-faq details > p {
    margin: 12px 0 0;
    padding-left: 24px;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .help-grid { grid-template-columns: 1fr; }
    .help-toc { display: none; }
    .help-toc-mobile { display: block; }
    .help-content { padding: 24px 20px; }
}