/* ==========================================================================
   DESIGN SYSTEM & CUSTOM PROPERTIES - LIGHT MODE
   ========================================================================== */
:root {
    --bg-main: #f1f5f9;
    --bg-card: #ffffff;
    --bg-sidebar: #ffffff;
    --bg-input: #ffffff;
    --border-color: #e2e8f0;
    
    --color-primary: #4f46e5;
    --color-primary-hover: #4338ca;
    --color-success: #10b981;
    --color-success-hover: #059669;
    --color-danger: #ef4444;
    --color-danger-hover: #dc2626;
    --color-warning: #d97706;
    
    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-dark: #0f172a;
    
    --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.05);
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

button, input, textarea, select {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    background: none;
    border: none;
}

button {
    cursor: pointer;
}

/* ==========================================================================
   LOGIN PAGE STYLING
   ========================================================================== */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.06) 0%, transparent 40%),
                radial-gradient(circle at 90% 80%, rgba(16, 185, 129, 0.05) 0%, transparent 45%),
                var(--bg-main);
}

.login-container {
    width: 100%;
    max-width: 440px;
    padding: 20px;
}

.login-card {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 40px 30px;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.logo-container {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--color-primary), #818cf8);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    box-shadow: 0 8px 16px rgba(99, 102, 241, 0.2);
}

.logo-symbol {
    font-size: 28px;
    color: white;
}

.login-header h2 {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 6px;
    background: linear-gradient(135deg, var(--text-dark), var(--color-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.login-form .form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-main);
}

.input-icon-wrapper {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 16px;
    transition: var(--transition-fast);
}

.input-icon-wrapper input {
    width: 100%;
    padding: 12px 14px 12px 42px;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-main);
    transition: var(--transition-normal);
}

.input-icon-wrapper input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.input-icon-wrapper input:focus + .input-icon {
    color: var(--color-primary);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-weight: 600;
    border-radius: 10px;
    transition: var(--transition-normal);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
    color: white;
    box-shadow: 0 4px 10px rgba(99, 102, 241, 0.15);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 14px rgba(99, 102, 241, 0.25);
}

.btn-block {
    width: 100%;
}

.alert {
    padding: 12px 16px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-danger {
    background-color: #fee2e2;
    border: 1px solid #fecaca;
    color: #991b1b;
}

.alert-success {
    background-color: #d1fae5;
    border: 1px solid #a7f3d0;
    color: #065f46;
}

.login-footer {
    text-align: center;
    margin-top: 30px;
    font-size: 12px;
    color: var(--text-muted);
}

.credentials-hint {
    margin-top: 12px;
    background-color: #f1f5f9;
    padding: 8px 12px;
    border-radius: 8px;
    display: inline-block;
    border: 1px solid #cbd5e1;
}

.credentials-hint code {
    background: rgba(0, 0, 0, 0.05);
    padding: 2px 4px;
    border-radius: 4px;
    color: #4338ca;
    font-family: monospace;
    font-weight: 600;
}

/* ==========================================================================
   LAYOUT STRUCTURE (SIDEBAR & MAIN CONTENT)
   ========================================================================== */
.layout-wrapper {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
    transition: width var(--transition-normal), transform var(--transition-normal);
    overflow: hidden;
}

/* Collapsed sidebar state (desktop toggle) */
.sidebar.sidebar-collapsed {
    width: 0;
    border-right: none;
}

/* Desktop sidebar toggle button */
.sidebar-toggle-btn {
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 110;
    width: 36px;
    height: 36px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: var(--text-muted);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
    opacity: 0;
    pointer-events: none;
}

.sidebar-toggle-btn.visible {
    opacity: 1;
    pointer-events: auto;
}

.sidebar-toggle-btn:hover {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
    box-shadow: 0 4px 10px rgba(99,102,241,0.25);
}

.sidebar-header {
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-logo {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary), #818cf8);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 8px rgba(99, 102, 241, 0.15);
}

.sidebar-logo i {
    font-size: 18px;
    color: white;
}

.sidebar-brand h3 {
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -0.2px;
}

.sidebar-brand p {
    font-size: 11px;
    color: var(--text-muted);
}

.sidebar-menu {
    list-style: none;
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-grow: 1;
}

.sidebar-item a {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 16px;
    border-radius: 10px;
    color: var(--text-muted);
    font-weight: 500;
    transition: var(--transition-normal);
}

.sidebar-item a:hover {
    color: var(--text-main);
    background-color: rgba(0, 0, 0, 0.03);
}

.sidebar-item.active a {
    color: var(--color-primary);
    background: rgba(99, 102, 241, 0.08);
    font-weight: 600;
    border-left: 3px solid var(--color-primary);
    border-radius: 0 10px 10px 0;
    margin-left: -16px;
    padding-left: 29px;
}

.sidebar-footer {
    padding: 20px 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: white;
    font-size: 14px;
}

.user-details h4 {
    font-size: 13px;
    font-weight: 600;
}

.user-details p {
    font-size: 10px;
    color: var(--text-muted);
}

.logout-icon {
    color: var(--text-muted);
    font-size: 18px;
    transition: var(--transition-fast);
}

.logout-icon:hover {
    color: var(--color-danger);
}

/* Main Content Area */
.main-content {
    margin-left: 260px;
    flex-grow: 1;
    padding: 32px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin-left var(--transition-normal);
}

/* When sidebar is collapsed, main content expands */
.main-content.sidebar-collapsed {
    margin-left: 0;
}

/* ==========================================================================
   DASHBOARD STAT CARDS & GRID
   ========================================================================== */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.page-title h1 {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

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

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: rgba(99, 102, 241, 0.4);
}

.stat-data p {
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.stat-data h3 {
    font-size: 26px;
    font-weight: 700;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.stat-icon.primary { background-color: rgba(99, 102, 241, 0.08); color: var(--color-primary); }
.stat-icon.success { background-color: rgba(16, 185, 129, 0.08); color: var(--color-success); }
.stat-icon.warning { background-color: rgba(217, 119, 6, 0.08); color: var(--color-warning); }
.stat-icon.danger { background-color: rgba(239, 68, 68, 0.08); color: var(--color-danger); }

/* ==========================================================================
   TABLE & DATA CONTAINER
   ========================================================================== */
.content-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    margin-bottom: 24px;
}

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.card-header h3 {
    font-size: 18px;
    font-weight: 600;
}

.search-filter-wrapper {
    display: flex;
    gap: 12px;
    align-items: center;
}

.search-input-wrapper {
    position: relative;
    width: 260px;
}

.search-input-wrapper i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-input-wrapper input {
    width: 100%;
    padding: 8px 12px 8px 36px;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-main);
    font-size: 14px;
    transition: var(--transition-normal);
}

.search-input-wrapper input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.table-responsive {
    width: 100%;
    overflow-x: auto;
}

.custom-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 14px;
}

.custom-table th {
    background-color: #f8fafc;
    padding: 14px 20px;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 0.5px;
}

.custom-table td {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
}

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

.custom-table tr:hover td {
    background-color: rgba(0, 0, 0, 0.01);
}

.serial-badge {
    background-color: rgba(99, 102, 241, 0.08);
    color: var(--color-primary);
    padding: 4px 8px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 13px;
    font-family: monospace;
}

.actions-cell {
    display: flex;
    gap: 8px;
}

.btn-icon {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: var(--transition-fast);
}

.btn-icon-view { background-color: rgba(99, 102, 241, 0.08); color: var(--color-primary); }
.btn-icon-view:hover { background-color: var(--color-primary); color: white; }

.btn-icon-edit { background-color: rgba(245, 158, 11, 0.08); color: #b45309; }
.btn-icon-edit:hover { background-color: var(--color-warning); color: white; }

.btn-icon-delete { background-color: rgba(239, 68, 68, 0.08); color: var(--color-danger); }
.btn-icon-delete:hover { background-color: var(--color-danger); color: white; }

.btn-secondary {
    background-color: #f1f5f9;
    border: 1px solid #cbd5e1;
    color: var(--text-main);
}
.btn-secondary:hover {
    background-color: #e2e8f0;
}

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

.empty-state {
    padding: 48px;
    text-align: center;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 48px;
    margin-bottom: 16px;
    color: var(--border-color);
}

/* ==========================================================================
   FORM & INVOICE BUILDER
   ========================================================================== */
.form-grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    padding: 24px;
    background-color: #f8fafc;
    border-bottom: 1px solid var(--border-color);
}

.form-grid-3 .form-group {
    margin-bottom: 0;
}

.invoice-meta-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    padding: 24px;
    background-color: #f8fafc;
    border-bottom: 1px solid var(--border-color);
}

.invoice-meta-grid .form-group {
    margin-bottom: 0;
}

.invoice-textarea-container {
    padding: 24px;
}

.filter-grid-row {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
    align-items: flex-end;
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-main);
    transition: var(--transition-normal);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
}

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

.invoice-builder-card {
    border-top: none;
}

.items-table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    background-color: #f8fafc;
    border-bottom: 1px solid var(--border-color);
}

.items-table-container {
    padding: 0;
}

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

.items-table th {
    padding: 12px 16px;
    background-color: #f1f5f9;
    color: var(--text-muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
}

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

.items-table tr.total-row td {
    background-color: #f8fafc;
    font-weight: 700;
    font-size: 15px;
    border-bottom: none;
}

.items-table tr.total-words-row td {
    background-color: #f1f5f9;
    font-style: italic;
    color: var(--text-main);
    border-bottom: none;
}

.input-cell {
    width: 100%;
    padding: 8px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 13px;
    transition: var(--transition-fast);
}

.input-cell:focus {
    outline: none;
    border-color: var(--color-primary);
    background-color: var(--bg-card);
}

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

.form-actions-bar {
    padding: 20px 24px;
    background-color: rgba(241, 245, 249, 0.4);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* ==========================================================================
   SETTINGS PAGE STYLING
   ========================================================================== */
.settings-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 30px;
}

@media (max-width: 992px) {
    .settings-container {
        grid-template-columns: 1fr;
    }
    .invoice-meta-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .filter-grid-row {
        grid-template-columns: repeat(2, 1fr);
    }
}

.settings-card {
    padding: 24px;
}

.settings-card .form-group {
    margin-bottom: 20px;
}

.settings-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
    margin-bottom: 20px;
}

.settings-header h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-main);
}

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

/* ==========================================================================
   ANIMATIONS & EFFECTS
   ========================================================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==========================================================================
   MOBILE RESPONSIVE NAVIGATION STYLES
   ========================================================================== */
.mobile-header {
    display: none;
    align-items: center;
    justify-content: space-between;
    background-color: #1e293b;
    color: #ffffff;
    padding: 12px 16px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    z-index: 150;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.menu-toggle-btn {
    background: transparent;
    border: none;
    color: #ffffff;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    transition: background-color var(--transition-fast);
}

.menu-toggle-btn:hover,
.menu-toggle-btn:active {
    background-color: rgba(255, 255, 255, 0.1);
}

.mobile-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 15px;
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.4);
    z-index: 180;
    opacity: 0;
    transition: opacity var(--transition-normal) ease;
    pointer-events: none;
}

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

/* ==========================================================================
   RESPONSIVE DESIGN MEDIA QUERIES
   ========================================================================== */
@media (max-width: 768px) {
    .layout-wrapper {
        display: block;
        width: 100%;
        overflow-x: hidden;
    }
    
    .mobile-header {
        display: flex;
    }
    
    /* Hide desktop toggle on mobile — mobile has its own header */
    .sidebar-toggle-btn {
        display: none !important;
    }
    
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        z-index: 200;
        transform: translateX(-100%);
        box-shadow: none;
        width: 260px !important; /* Always full width on mobile when open */
    }
    
    .sidebar.active {
        transform: translateX(0);
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    }
    
    .main-content {
        margin-left: 0 !important;
        padding: 76px 16px 24px 16px !important;
        width: 100%;
        min-width: 0;
        box-sizing: border-box;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
    
    .card-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .search-input-wrapper {
        width: 100%;
    }
    
    .table-responsive .custom-table,
    .table-responsive .items-table {
        min-width: 750px;
    }
    
    .textarea-control {
        min-height: 130px;
    }
}

@media (max-width: 576px) {
    .invoice-meta-grid {
        grid-template-columns: 1fr;
        gap: 16px;
        padding: 16px;
    }
    .invoice-textarea-container {
        padding: 16px;
    }
    .filter-grid-row {
        grid-template-columns: 1fr;
    }
    .textarea-control {
        min-height: 130px;
    }
}