/* ==========================================================================
   Kırşehir Bil Koleji - İzin Yönetim Sistemi
   Modern, Ultra Hızlı & Kurumsal Tasarım Sistemi (2026)
   ========================================================================== */

/* ==================== Google Fonts (Swap & Fast Render) ==================== */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

/* ==================== CSS Değişkenleri (Theme Tokens) ==================== */
:root {
    /* Font Ailesi */
    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

    /* Renk Paleti - Kurumsal Safir & Slate (Varsayılan Açık Tema) */
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --primary-gradient: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
    
    --accent: #6366f1;
    --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);

    --success: #10b981;
    --success-bg: #ecfdf5;
    --success-text: #047857;
    --success-border: #a7f3d0;

    --warning: #f59e0b;
    --warning-bg: #fffbeb;
    --warning-text: #b45309;
    --warning-border: #fde68a;

    --danger: #ef4444;
    --danger-bg: #fef2f2;
    --danger-text: #b91c1c;
    --danger-border: #fecaca;

    --info: #0284c7;
    --info-bg: #f0f9ff;
    --info-text: #0369a1;
    --info-border: #bae6fd;

    /* Yüzey & Arka Plan (Açık Tema) */
    --bg-body: #f8fafc;
    --bg-surface: #ffffff;
    --bg-surface-elevated: #ffffff;
    --bg-muted: #f1f5f9;
    --bg-subtle: #f8fafc;

    /* Kenarlık & Çizgiler */
    --border-color: #e2e8f0;
    --border-subtle: #edf2f7;
    --border-focus: #3b82f6;

    /* Metin Renkleri */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --text-inverse: #ffffff;

    /* Gölgeler (Yüksek Performanslı, Doğal Gölgeler) */
    --shadow-xs: 0 1px 2px 0 rgba(15, 23, 42, 0.04);
    --shadow-sm: 0 1px 3px 0 rgba(15, 23, 42, 0.08), 0 1px 2px -1px rgba(15, 23, 42, 0.08);
    --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);

    /* Yuvarlatma (Border Radius) */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Boşluklar (Spacing) */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1.25rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Geçişler (Sadece transform ve opacity - 60 FPS) */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================== Koyu Tema (Dark Mode) ==================== */
body.dark-mode {
    --bg-body: #090d16;
    --bg-surface: #111827;
    --bg-surface-elevated: #1e293b;
    --bg-muted: #1e293b;
    --bg-subtle: #0f172a;

    --border-color: #2e384d;
    --border-subtle: #1e293b;
    --border-focus: #60a5fa;

    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-inverse: #0f172a;

    --primary-light: rgba(37, 99, 235, 0.15);

    --success-bg: rgba(16, 185, 129, 0.15);
    --success-text: #34d399;
    --success-border: rgba(16, 185, 129, 0.3);

    --warning-bg: rgba(245, 158, 11, 0.15);
    --warning-text: #fbbf24;
    --warning-border: rgba(245, 158, 11, 0.3);

    --danger-bg: rgba(239, 68, 68, 0.15);
    --danger-text: #f87171;
    --danger-border: rgba(239, 68, 68, 0.3);

    --info-bg: rgba(2, 132, 199, 0.15);
    --info-text: #38bdf8;
    --info-border: rgba(2, 132, 199, 0.3);

    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

/* ==================== Temel Sıfırlama & Tipografi ==================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 15px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* ==================== Düzen (Layout) ==================== */
.container {
    width: 100%;
    max-width: 1360px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.text-gradient {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ==================== Navbar (Üst Menü) ==================== */
.navbar {
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 0.75rem 0;
    box-shadow: var(--shadow-xs);
}

.navbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.navbar-brand img {
    height: 38px;
    width: auto;
    object-fit: contain;
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.navbar-user {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding-left: 0.75rem;
    border-left: 1px solid var(--border-color);
}

.user-avatar {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-full);
    background: var(--primary-gradient);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.95rem;
    box-shadow: var(--shadow-sm);
}

/* ==================== Tema Değiştirici (Theme Toggle) ==================== */
.theme-switcher {
    display: flex;
    align-items: center;
}

.theme-toggle {
    width: 60px;
    height: 32px;
    background-color: var(--bg-muted);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: 3px;
    cursor: pointer;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.theme-toggle:hover {
    border-color: var(--primary);
}

.theme-toggle-slider {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 24px;
    height: 24px;
    background: var(--primary);
    border-radius: var(--radius-full);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
    transition: transform var(--transition-base);
}

body.dark-mode .theme-toggle-slider {
    transform: translateX(28px);
    background: #f59e0b;
}

.theme-icon {
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    opacity: 0.5;
    z-index: 1;
    transition: opacity var(--transition-fast);
    padding: 0 4px;
}

.theme-icon.active { opacity: 1; }

/* ==================== Kartlar (Cards & Surfaces) ==================== */
.glass-card, .card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
}

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

.glass-card-header {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.glass-card-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.glass-card-header p {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: 0.2rem;
}

/* ==================== Bugün İzinli Olanlar Paneli (Active Today) ==================== */
.active-today-card {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.06) 0%, rgba(99, 102, 241, 0.08) 100%);
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.75rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.active-today-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.active-today-badge-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--primary);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.active-today-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.active-today-person {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0.75rem;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: var(--shadow-xs);
}

/* ==================== Başlık Alanı (Page Header) ==================== */
.page-header {
    margin-bottom: var(--spacing-lg);
}

.page-title {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 1.25;
}

/* ==================== İstatistik Kartları (KPIs) ==================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
    margin-bottom: var(--spacing-lg);
}

.stat-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1.5rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 1.25rem;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.stat-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
    background: var(--bg-muted);
    color: var(--primary);
}

.stat-content {
    flex: 1;
    min-width: 0;
}

.stat-value {
    font-size: 1.85rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    margin-top: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* Kart Varyasyonları */
.stat-card.stat-primary .stat-icon { background: rgba(37, 99, 235, 0.1); color: #2563eb; }
.stat-card.stat-warning .stat-icon { background: rgba(245, 158, 11, 0.1); color: #d97706; }
.stat-card.stat-success .stat-icon { background: rgba(16, 185, 129, 0.1); color: #059669; }
.stat-card.stat-danger .stat-icon { background: rgba(239, 68, 68, 0.1); color: #dc2626; }

/* ==================== Butonlar (Buttons) ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    font-family: inherit;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    line-height: 1.35;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.btn-primary {
    background-color: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
    box-shadow: 0 1px 2px 0 rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px 0 rgba(37, 99, 235, 0.3);
}

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

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

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

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

.btn-outline {
    background-color: var(--bg-surface);
    border-color: var(--border-color);
    color: var(--text-secondary);
}

.btn-outline:hover {
    background-color: var(--bg-muted);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8rem;
    border-radius: var(--radius-sm);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* ==================== Hızlı Filtre Butonları (Filter Chips) ==================== */
.filter-chip-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.filter-chip {
    padding: 0.35rem 0.85rem;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-chip:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.filter-chip.active {
    background-color: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}

/* ==================== Toplu İşlem Yüzen Çubuğu (Bulk Action Bar) ==================== */
.bulk-action-bar {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--text-primary);
    color: var(--text-inverse);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    gap: 1.25rem;
    box-shadow: var(--shadow-xl);
    z-index: 500;
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
}

.bulk-action-bar.active {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
    visibility: visible;
}

/* ==================== Hızlı Tarih Doldurma Butonları (Preset Chips) ==================== */
.preset-dates-bar {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
}

.preset-date-btn {
    padding: 0.25rem 0.65rem;
    background-color: var(--bg-muted);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.preset-date-btn:hover {
    background-color: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
}

.duration-preview-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.75rem;
    background-color: var(--success-bg);
    color: var(--success-text);
    border: 1px solid var(--success-border);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 700;
    margin-top: 0.5rem;
}

/* ==================== Formlar (Forms & Inputs) ==================== */
.form-group {
    margin-bottom: 1.15rem;
}

.form-label {
    display: block;
    margin-bottom: 0.375rem;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: inherit;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-muted);
}

.form-textarea {
    resize: vertical;
    min-height: 90px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-bottom: 0.5rem;
}

/* ==================== Tablolar (Data Tables) ==================== */
.table-container {
    width: 100%;
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--bg-surface);
}

.table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.875rem;
}

.table thead {
    background-color: var(--bg-muted);
    border-bottom: 1px solid var(--border-color);
}

.table th {
    padding: 0.875rem 1rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.table td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    vertical-align: middle;
}

.table tbody tr:last-child td {
    border-bottom: none;
}

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

.table tbody tr:hover {
    background-color: var(--bg-subtle);
}

/* Checkbox stili */
.custom-checkbox {
    width: 17px;
    height: 17px;
    cursor: pointer;
    accent-color: var(--primary);
}

/* ==================== Rozetler (Badges & Pills) ==================== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.65rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    line-height: 1.2;
    white-space: nowrap;
}

.badge-pending {
    background-color: var(--warning-bg);
    color: var(--warning-text);
    border: 1px solid var(--warning-border);
}

.badge-approved {
    background-color: var(--success-bg);
    color: var(--success-text);
    border: 1px solid var(--success-border);
}

.badge-rejected {
    background-color: var(--danger-bg);
    color: var(--danger-text);
    border: 1px solid var(--danger-border);
}

.badge-teacher {
    background-color: #eff6ff;
    color: #1d4ed8;
    border: 1px solid #bfdbfe;
}

body.dark-mode .badge-teacher {
    background-color: rgba(37, 99, 235, 0.2);
    color: #93c5fd;
    border-color: rgba(37, 99, 235, 0.4);
}

.badge-staff {
    background-color: #f5f3ff;
    color: #6d28d9;
    border: 1px solid #ddd6fe;
}

body.dark-mode .badge-staff {
    background-color: rgba(109, 40, 217, 0.2);
    color: #c4b5fd;
    border-color: rgba(109, 40, 217, 0.4);
}

/* ==================== Takvim (Interactive Calendar) ==================== */
.calendar-section {
    margin-bottom: var(--spacing-lg);
}

.calendar-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 1rem 0 1.25rem;
    padding: 0 0.5rem;
}

.calendar-month-title {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.calendar-nav-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.1rem;
    transition: all var(--transition-fast);
}

.calendar-nav-btn:hover {
    background-color: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
    margin-bottom: 1rem;
}

.calendar-day-header {
    text-align: center;
    font-weight: 700;
    color: var(--text-secondary);
    padding: 0.625rem;
    background-color: var(--bg-muted);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.calendar-day {
    min-height: 96px;
    padding: 0.5rem;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    position: relative;
    cursor: pointer;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.calendar-day:hover {
    background-color: var(--bg-subtle);
    border-color: var(--primary);
}

.calendar-day.other-month {
    opacity: 0.35;
    background-color: var(--bg-muted);
}

.calendar-day.today {
    border: 2px solid var(--primary);
    background-color: var(--primary-light);
}

.calendar-day-number {
    font-weight: 800;
    font-size: 0.875rem;
    color: var(--text-primary);
    margin-bottom: 0.35rem;
}

.calendar-leave-item {
    font-size: 0.72rem;
    padding: 3px 6px;
    border-radius: 4px;
    margin-top: 3px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-weight: 600;
    cursor: pointer;
    line-height: 1.25;
    transition: transform var(--transition-fast), filter var(--transition-fast);
}

.calendar-leave-item:hover {
    filter: brightness(1.1);
    transform: scale(1.02);
}

.calendar-leave-item.teacher {
    background-color: #2563eb;
    color: #ffffff;
}

.calendar-leave-item.staff {
    background-color: #7c3aed;
    color: #ffffff;
}

.calendar-legend {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    padding: 0.75rem;
    background-color: var(--bg-muted);
    border-radius: var(--radius-md);
    margin-top: 0.75rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
}

/* ==================== Sekmeler (Tabs) ==================== */
.section-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    overflow-x: auto;
}

.tab-btn {
    padding: 0.625rem 1.25rem;
    background-color: transparent;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    font-family: inherit;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.tab-btn:hover {
    background-color: var(--bg-muted);
    color: var(--text-primary);
}

.tab-btn.active {
    background-color: var(--primary);
    color: #ffffff;
    box-shadow: var(--shadow-sm);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ==================== Personel Listesi Öğesi ==================== */
.staff-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.875rem 1.25rem;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 0.625rem;
    transition: all var(--transition-fast);
}

.staff-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.staff-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.staff-avatar-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background-color: var(--bg-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--primary);
}

/* ==================== Dosya Yükleme (Dropzone) ==================== */
.file-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem 1.5rem;
    text-align: center;
    cursor: pointer;
    background-color: var(--bg-muted);
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.file-upload-area:hover,
.file-upload-area.dragover {
    border-color: var(--primary);
    background-color: var(--primary-light);
}

.file-upload-icon {
    font-size: 2.25rem;
    margin-bottom: 0.5rem;
    color: var(--primary);
}

/* ==================== Modallar (Modals) ==================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 23, 42, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), visibility var(--transition-fast);
    padding: 1rem;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    transform: scale(0.96);
    transition: transform var(--transition-fast);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--danger);
}

/* ==================== Toast Bildirimleri ==================== */
.toast-container {
    position: fixed;
    top: 1.25rem;
    right: 1.25rem;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    pointer-events: none;
}

.toast {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-md);
    padding: 0.875rem 1.25rem;
    min-width: 300px;
    max-width: 420px;
    box-shadow: var(--shadow-lg);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 600;
    pointer-events: auto;
    animation: toastIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes toastIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast-success { border-left-color: var(--success); }
.toast-error { border-left-color: var(--danger); }
.toast-warning { border-left-color: var(--warning); }
.toast-info { border-left-color: var(--info); }

/* ==================== Spinner ==================== */
.loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    margin: 2rem auto;
}

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

/* ==================== Giriş / Kayıt Sayfaları ==================== */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    background: radial-gradient(circle at 50% 0%, var(--bg-muted) 0%, var(--bg-body) 70%);
}

.auth-card {
    max-width: 440px;
    width: 100%;
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-logo {
    width: 84px;
    height: 84px;
    margin: 0 auto 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.auth-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.auth-title {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    margin-bottom: 0.35rem;
}

.auth-subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ==================== Responsive (Mobil & Tablet) ==================== */
@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    html { font-size: 14px; }

    .navbar-content {
        flex-direction: column;
        gap: 0.75rem;
        align-items: stretch;
    }

    .navbar-menu {
        justify-content: space-between;
        width: 100%;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .calendar-grid {
        gap: 2px;
    }

    .calendar-day {
        min-height: 60px;
        padding: 0.25rem;
    }

    .calendar-day-number {
        font-size: 0.75rem;
    }

    .calendar-leave-item {
        font-size: 0.6rem;
        padding: 2px 4px;
    }

    /* Mobilde Tablo Kart Görünümü */
    .table-responsive-cards thead {
        display: none;
    }

    .table-responsive-cards,
    .table-responsive-cards tbody,
    .table-responsive-cards tr,
    .table-responsive-cards td {
        display: block;
        width: 100%;
    }

    .table-responsive-cards tr {
        background-color: var(--bg-surface);
        border: 1px solid var(--border-color);
        border-radius: var(--radius-md);
        margin-bottom: 0.875rem;
        padding: 1rem;
    }

    .table-responsive-cards td {
        padding: 0.35rem 0;
        border: none;
    }

    .toast-container {
        top: 0.5rem;
        right: 0.5rem;
        left: 0.5rem;
    }

    .toast {
        min-width: auto;
        width: 100%;
    }
}

/* ==================== Yazdırma Stilleri (Print Mode) ==================== */
@media print {
    body {
        background: #ffffff !important;
        color: #000000 !important;
    }

    .navbar, .theme-switcher, .btn, .calendar-controls, .form-group, .action-buttons, .bulk-action-bar {
        display: none !important;
    }

    .glass-card, .card {
        border: none !important;
        box-shadow: none !important;
        padding: 0 !important;
    }

    .table th {
        background: #f1f5f9 !important;
        color: #000 !important;
        border: 1px solid #cbd5e1 !important;
    }

    .table td {
        border: 1px solid #cbd5e1 !important;
        color: #000 !important;
    }
}