/* ==========================================================================
   1. CSS VARIABLES & THEME CONFIGURATION
   ========================================================================== */
:root {
    /* Brand Colors */
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #eff6ff;
    --secondary: #64748b;
    
    /* Status Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    
    /* Neutral Colors */
    --bg-body: #f1f5f9;
    --bg-card: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    
    /* Spacing & Layout */
    --sidebar-width: 260px;
    --header-height: 70px;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Transitions */
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { font-family: inherit; }

/* ==========================================================================
   3. LAYOUT STRUCTURE
   ========================================================================== */
.dashboard {
    display: flex;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

.main-content {
    flex: 1;
    margin-left: 0;
    width: 100%;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

/* Desktop Sidebar Shift */
@media (min-width: 992px) {
    .main-content {
        margin-left: var(--sidebar-width);
        width: calc(100% - var(--sidebar-width));
    }
}

/* ==========================================================================
   4. SIDEBAR NAVIGATION
   ========================================================================== */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-card);
    border-right: 1px solid var(--border-color);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    transform: translateX(-100%);
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
}

@media (min-width: 992px) {
    .sidebar {
        transform: translateX(0);
        box-shadow: none;
    }
}

.sidebar.active {
    transform: translateX(0);
}

/* Sidebar Header */
.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-logo i {
    width: 40px;
    height: 40px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.sidebar-logo h2 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-main);
}

.sidebar-subtitle {
    font-size: 12px;
    color: var(--text-muted);
    margin-left: 52px;
    margin-top: -4px;
}

/* Sidebar Menu */
.sidebar-menu {
    flex: 1;
    padding: 24px 16px;
    overflow-y: auto;
}

.sidebar-menu li {
    margin-bottom: 4px;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--border-radius-sm);
    color: var(--text-muted);
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition);
}

.sidebar-menu a i {
    width: 20px;
    text-align: center;
    font-size: 16px;
}

.sidebar-menu a:hover {
    background: var(--bg-body);
    color: var(--text-main);
}

.sidebar-menu a.active {
    background: var(--primary-light);
    color: var(--primary);
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    background: #f8fafc;
}

.sidebar-footer .user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.sidebar-footer .user-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.sidebar-footer .user-details h4 {
    font-size: 14px;
    font-weight: 600;
}

.sidebar-footer .user-details small {
    font-size: 12px;
    color: var(--text-muted);
}

/* Overlay for Mobile */
.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
}

.sidebar-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

/* ==========================================================================
   5. HEADER
   ========================================================================== */
.dashboard-header {
    background: var(--bg-card);
    height: var(--header-height);
    padding: 0 24px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 900;
}

.header-content {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Mobile Toggle */
.menu-toggle-btn {
    display: none;
    background: none;
    border: none;
    font-size: 20px;
    color: var(--text-muted);
    cursor: pointer;
    padding: 8px;
}

@media (max-width: 992px) {
    .menu-toggle-btn { display: block; }
}

/* Header Actions */
.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-left: auto;
}

.header-right .user-profile {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.header-right .user-profile:hover {
    background: var(--bg-body);
}

.header-right .user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
}

.header-right .user-info {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.header-right .user-name {
    font-size: 14px;
    font-weight: 500;
}

.header-right .user-dropdown {
    font-size: 12px;
    color: var(--text-muted);
}

.header-right button {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 18px;
    cursor: pointer;
    width: 36px;
    height: 36px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.header-right button:hover {
    background: var(--bg-body);
    color: var(--primary);
}

/* Theme Toggle */
.theme-toggle .moon { display: block; }
.theme-toggle .sun { display: none; }
.theme-toggle.dark .moon { display: none; }
.theme-toggle.dark .sun { display: block; }

/* ==========================================================================
   6. CARDS & CONTAINERS
   ========================================================================== */
.data-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
    overflow: hidden;
    transition: var(--transition);
}

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

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #ffffff;
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-body {
    padding: 24px;
}

/* Page Header */
.page-header-content {
    margin: 24px;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.page-title h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 4px;
}

.page-title p {
    color: var(--text-muted);
    font-size: 14px;
}

/* ==========================================================================
   7. FORMS & INPUTS
   ========================================================================== */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.form-row {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.form-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-width: 200px;
}

.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    color: var(--text-main);
    background: #ffffff;
    transition: var(--transition);
}

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

.form-group input[readonly] {
    background-color: var(--bg-body);
    color: var(--text-muted);
    cursor: default;
}

/* ==========================================================================
   8. BUTTONS
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
    text-decoration: none;
    line-height: 1;
}

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

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

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: 0 2px 4px rgba(59, 130, 246, 0.2);
}

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

.btn-secondary:hover {
    background: var(--bg-body);
    color: var(--text-main);
    border-color: #cbd5e1;
}

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

.btn-outline:hover {
    background: var(--bg-body);
    color: var(--text-main);
    border-color: #cbd5e1;
}

.btn-danger {
    background: #fee2e2;
    color: var(--danger);
    border-color: #fecaca;
}

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

.btn-light {
    background: #f1f5f9;
    color: var(--text-muted);
}
.btn-light:hover {
    background: #e2e8f0;
    color: var(--text-main);
}

/* ==========================================================================
   9. TABLES
   ========================================================================== */
.table-responsive {
    width: 100%;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

th {
    text-align: left;
    padding: 16px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    background: var(--bg-body);
    border-bottom: 1px solid var(--border-color);
    letter-spacing: 0.05em;
}

td {
    padding: 16px;
    font-size: 14px;
    color: var(--text-main);
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

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

tr:hover td {
    background-color: #f8fafc;
}

/* Mobile Stacked Tables */
@media (max-width: 768px) {
    .stacked-table thead { display: none; }
    
    .stacked-table tbody, 
    .stacked-table tr, 
    .stacked-table td { 
        display: block; 
        width: 100%; 
    }
    
    .stacked-table tr {
        margin-bottom: 16px;
        background: white;
        border: 1px solid var(--border-color);
        border-radius: var(--border-radius);
        box-shadow: var(--shadow-sm);
    }
    
    .stacked-table td {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 12px 16px;
        border-bottom: 1px solid var(--bg-body);
        text-align: right;
    }
    
    .stacked-table td::before {
        content: attr(data-label);
        font-weight: 600;
        font-size: 12px;
        color: var(--text-muted);
        text-transform: uppercase;
        margin-right: auto;
    }
}

/* ==========================================================================
   10. UTILITIES & HELPERS
   ========================================================================== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }
.text-center-p20 { text-align: center; padding: 20px; }

.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-muted { color: var(--text-muted); }
.font-mono { font-family: 'Courier New', monospace; }

.mb-3 { margin-bottom: 24px; }
.mt-3 { margin-top: 24px; }
.p-25 { padding: 24px; }

.badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}
.badge-danger { background: #fee2e2; color: var(--danger); }
.badge-success { background: #dcfce7; color: var(--success); }
.badge-warning { background: #fef3c7; color: var(--warning); }

.alert {
    padding: 16px;
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.alert-warning { background: #fffbeb; color: #92400e; border: 1px solid #fcd34d; }
.alert-info { background: #eff6ff; color: #1e40af; border: 1px solid #bfdbfe; }
.alert-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; }

.hidden { display: none !important; }

.flex-gap-10 {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

/* Pagination */
.pager {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 20px;
    flex-wrap: wrap;
    gap: 12px;
}
.pager-info {
    font-size: 14px;
    color: var(--text-muted);
}
.pager-actions {
    display: flex;
    gap: 8px;
}

/* API Credentials & Extra Utilities */
.readonly-box {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 12px 16px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    color: var(--text-main);
    word-break: break-all;
}

.code-block {
    background: #1e293b;
    color: #f1f5f9;
    padding: 16px;
    border-radius: var(--border-radius-sm);
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 13px;
    margin: 10px 0 20px 0;
    line-height: 1.6;
}

.subtitle {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 12px;
    margin-top: 24px;
}
.subtitle:first-child { margin-top: 0; }

.info-text {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
    display: block;
}

.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.mt-15 { margin-top: 15px; }

input.readonly {
    background-color: var(--bg-body) !important;
    color: var(--text-muted);
    cursor: default;
}


/* ==========================================================================
   11. RESPONSIVE ADJUSTMENTS
   ========================================================================== */
@media (max-width: 768px) {
    .page-header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        margin: 16px;
    }
    
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .card-header .btn {
        width: 100%;
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .header-right .user-info {
        display: none;
    }
}