:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --accent-primary: #0d6efd;
    --accent-hover: #0b5ed7;
    --border-color: #dee2e6;
    --success: #198754;
    --danger: #dc3545;
    --warning: #ffc107;
    --shadow: rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --primary-light: #e7f3ff;
}

[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3a3a3a;
    --text-primary: #f8f9fa;
    --text-secondary: #adb5bd;
    --accent-primary: #4dabf7;
    --accent-hover: #339af0;
    --border-color: #495057;
    --success: #51cf66;
    --danger: #ff6b6b;
    --warning: #ffd43b;
    --shadow: rgba(0, 0, 0, 0.3);
    --primary-light: #1e3a5f;
}

/* RTL Support */
[dir="rtl"] {
    direction: rtl;
}

[dir="rtl"] .navbar {
    direction: rtl;
}

[dir="rtl"] .nav-menu {
    flex-direction: row-reverse;
}

[dir="rtl"] .card,
[dir="rtl"] .table,
[dir="rtl"] .form-group {
    text-align: right;
}

[dir="rtl"] .btn {
    text-align: center;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header & Navigation */
.header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    box-shadow: 0 2px 8px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: var(--transition);
    font-weight: 500;
}

.nav-links a:hover {
    background-color: var(--bg-tertiary);
    color: var(--accent-primary);
}

.nav-links a.active {
    background-color: var(--accent-primary);
    color: white;
}

/* Theme Toggle */
.theme-toggle {
    background-color: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 50px;
    padding: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    font-size: 1.2rem;
    width: 60px;
    height: 32px;
    position: relative;
}

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

.theme-toggle-slider {
    width: 24px;
    height: 24px;
    background-color: var(--accent-primary);
    border-radius: 50%;
    position: absolute;
    transition: var(--transition);
    left: 2px;
}

[data-theme="dark"] .theme-toggle-slider {
    transform: translateX(28px);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    gap: 2px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    justify-content: center;
    align-items: center;
    min-width: 24px;
    min-height: 24px;
    order: -1;
    margin-right: auto;
    z-index: 101;
    position: relative;
}

.mobile-menu-toggle:hover {
    opacity: 0.7;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: center;
    margin-top: 2px;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translateY(8px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: translateX(-10px);
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translateY(-8px);
}

/* Desktop/Tablet responsive nav */
@media (max-width: 1024px) {
    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-secondary);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        /* Avoid flex gap for better Edge compatibility */
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
        padding: 0;
        width: 100%;
        align-items: stretch;
        flex-wrap: nowrap;
        z-index: 1000;
    }

    .nav-links.mobile-open {
        max-height: 800px;
        padding: 0.5rem 0;
        box-shadow: 0 4px 12px var(--shadow);
        z-index: 1000;
    }

    .nav-links a,
    .nav-links button:not(#mobile-menu-toggle) {
        border-radius: 0;
        margin: 0;
        padding: 0.75rem 1.5rem;
        text-align: left;
        width: 100%;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-links a:last-child,
    .nav-links button:not(#mobile-menu-toggle):last-child {
        border-bottom: none;
    }

    .nav-links a:hover {
        background-color: var(--bg-tertiary);
    }

    .nav-container {
        flex-wrap: wrap;
    }
}/* Cards */
.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 8px var(--shadow);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.card-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    border-bottom: 2px solid var(--accent-primary);
    padding-bottom: 0.5rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.1);
}

.form-checkbox {
    width: auto;
    margin-right: 0.5rem;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

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

.btn-success:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

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

.btn-danger:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

/* Tables */
.table-container {
    overflow-x: auto;
    border-radius: 12px;
    background-color: var(--bg-secondary);
    box-shadow: 0 2px 8px var(--shadow);
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead {
    background-color: var(--bg-tertiary);
}

th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

tr:hover {
    background-color: var(--bg-tertiary);
}

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

/* Alerts */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border-left: 4px solid;
}

.alert-success {
    background-color: rgba(25, 135, 84, 0.1);
    border-color: var(--success);
    color: var(--success);
}

.alert-danger {
    background-color: rgba(220, 53, 69, 0.1);
    border-color: var(--danger);
    color: var(--danger);
}

.alert-info {
    background-color: rgba(13, 110, 253, 0.1);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* File Upload Zone */
.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 3rem;
    text-align: center;
    background-color: var(--bg-secondary);
    transition: var(--transition);
    cursor: pointer;
}

.upload-zone:hover {
    border-color: var(--accent-primary);
    background-color: var(--bg-tertiary);
}

.upload-zone.dragging {
    border-color: var(--accent-primary);
    background-color: var(--bg-tertiary);
}

/* File List */
.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 0.75rem;
    transition: var(--transition);
}

.file-item:hover {
    background-color: var(--bg-tertiary);
    transform: translateX(4px);
}

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

.file-icon {
    font-size: 1.5rem;
}

.file-name {
    font-weight: 500;
    color: var(--text-primary);
}

.file-meta {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.file-actions {
    display: flex;
    gap: 0.5rem;
}

/* Login Page */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-hover) 100%);
}

.login-card {
    background-color: var(--bg-primary);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 8px 32px var(--shadow);
    max-width: 400px;
    width: 100%;
}

.login-title {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-primary);
    font-size: 2rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        align-items: stretch;
    }
    
    .nav-links {
        flex-direction: column;
        width: 100%;
    }
    
    .nav-links a {
        width: 100%;
        text-align: center;
    }
    
    .card {
        padding: 1rem;
    }
    
    table {
        font-size: 0.875rem;
    }
    
    th, td {
        padding: 0.5rem;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }

/* Language Selector */
.language-selector {
    position: relative;
}

.language-selector .lang-toggle {
    color: var(--text-primary);
    transition: background 0.2s;
}

.language-selector .lang-toggle:hover {
    background: var(--bg-tertiary) !important;
}

.language-selector .lang-menu {
    max-height: 400px;
    overflow-y: auto;
}

.language-selector .lang-option {
    transition: background 0.2s;
}

.language-selector .lang-option:hover {
    background: var(--bg-secondary) !important;
}

.language-selector .lang-option:last-child {
    border-bottom: none !important;
}