/*
 * All in One Invoice - Main Stylesheet
 * Modern, clean design with CSS variables for theming
 */

/* ===== CSS VARIABLES ===== */
:root {
    /* Primary Colors */
    --primary: #4F46E5;
    --primary-dark: #4338CA;
    --primary-light: #818CF8;
    --primary-gradient: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);

    /* Secondary Colors */
    --secondary: #7C3AED;
    --secondary-dark: #6D28D9;
    --secondary-light: #A78BFA;

    /* Accent Colors */
    --accent: #06B6D4;
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --info: #3B82F6;

    /* Neutral Colors */
    --white: #FFFFFF;
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    --black: #000000;

    /* Background & Surface */
    --bg-primary: #F8FAFC;
    --bg-secondary: #FFFFFF;
    --surface: #FFFFFF;
    --surface-hover: #F3F4F6;

    /* Text Colors */
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-muted: #9CA3AF;
    --text-inverse: #FFFFFF;

    /* Border & Shadow */
    --border-color: #E5E7EB;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --glow: 0 0 20px rgba(79, 70, 229, 0.3);

    /* 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;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;

    /* Layout */
    --sidebar-width: 280px;
    --sidebar-collapsed: 80px;
    --header-height: 70px;
    --transition: all 0.3s ease;
}

/* ===== DARK MODE ===== */
[data-theme="dark"] {
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --surface: #1E293B;
    --surface-hover: #334155;
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --border-color: #334155;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

img {
    max-width: 100%;
    height: auto;
}

/* ===== TYPOGRAPHY ===== */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 {
    font-size: var(--font-size-4xl);
}

h2 {
    font-size: var(--font-size-3xl);
}

h3 {
    font-size: var(--font-size-2xl);
}

h4 {
    font-size: var(--font-size-xl);
}

h5 {
    font-size: var(--font-size-lg);
}

h6 {
    font-size: var(--font-size-base);
}

.text-muted {
    color: var(--text-muted);
}

.text-secondary {
    color: var(--text-secondary);
}

.text-success {
    color: var(--success);
}

.text-warning {
    color: var(--warning);
}

.text-danger {
    color: var(--danger);
}

.text-primary {
    color: var(--primary);
}

/* ===== LAYOUT ===== */
.app-container {
    display: flex;
    min-height: 100vh;
}

.main-wrapper {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    transition: var(--transition);
}

.main-wrapper.collapsed {
    margin-left: var(--sidebar-collapsed);
}

.main-content {
    padding: var(--space-6);
    margin-top: var(--header-height);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* ===== SIDEBAR ===== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--surface);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: var(--transition);
    overflow: hidden;
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed);
}

.sidebar-header {
    padding: var(--space-5);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    border-bottom: 1px solid var(--border-color);
    min-height: var(--header-height);
}

.sidebar-logo {
    width: 40px;
    height: 40px;
    background: var(--primary-gradient);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--white);
    font-size: var(--font-size-lg);
    flex-shrink: 0;
}

.sidebar-brand {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
    white-space: nowrap;
    opacity: 1;
    transition: var(--transition);
}

.sidebar.collapsed .sidebar-brand {
    opacity: 0;
    width: 0;
}

.sidebar-nav {
    flex: 1;
    padding: var(--space-4);
    overflow-y: auto;
}

.nav-section {
    margin-bottom: var(--space-6);
}

.nav-section-title {
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    padding: var(--space-2) var(--space-3);
    white-space: nowrap;
}

.sidebar.collapsed .nav-section-title {
    opacity: 0;
}

.nav-item {
    margin-bottom: var(--space-1);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    white-space: nowrap;
}

.nav-link:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

.nav-link.active {
    background: var(--primary);
    color: var(--white);
}

.nav-link i {
    font-size: 1.25rem;
    flex-shrink: 0;
    width: 24px;
    text-align: center;
}

.nav-link span {
    opacity: 1;
    transition: var(--transition);
}

.sidebar.collapsed .nav-link span {
    opacity: 0;
    width: 0;
}

.sidebar-footer {
    padding: var(--space-4);
    border-top: 1px solid var(--border-color);
}

/* ===== HEADER ===== */
.header {
    position: fixed;
    top: 0;
    left: var(--sidebar-width);
    right: 0;
    height: var(--header-height);
    background: var(--surface);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-6);
    z-index: 999;
    transition: var(--transition);
}

.header.collapsed {
    left: var(--sidebar-collapsed);
}

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

.sidebar-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: var(--surface-hover);
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.sidebar-toggle:hover {
    background: var(--primary);
    color: var(--white);
}

.page-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

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

.header-search {
    position: relative;
}

.header-search input {
    width: 300px;
    padding: var(--space-3) var(--space-4) var(--space-3) var(--space-10);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    transition: var(--transition);
}

.header-search input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.header-search i {
    position: absolute;
    left: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.theme-toggle,
.notification-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.theme-toggle:hover,
.notification-btn:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

.notification-badge {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 8px;
    height: 8px;
    background: var(--danger);
    border-radius: 50%;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.user-menu:hover {
    background: var(--surface-hover);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: 600;
}

.user-info {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-weight: 500;
    font-size: var(--font-size-sm);
}

.user-role {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

/* ===== CARDS ===== */
.card {
    background: var(--surface);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

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

.card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin: 0;
}

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

.card-footer {
    padding: var(--space-5) var(--space-6);
    border-top: 1px solid var(--border-color);
    background: var(--bg-primary);
    border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
}

/* Stat Cards */
.stat-card {
    padding: var(--space-6);
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.stat-icon.primary {
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary);
}

.stat-icon.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

.stat-icon.warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.stat-icon.danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.stat-content {
    flex: 1;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-1);
}

.stat-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
}

.stat-change {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--font-size-sm);
    margin-top: var(--space-2);
}

.stat-change.positive {
    color: var(--success);
}

.stat-change.negative {
    color: var(--danger);
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
    font-weight: 500;
    line-height: 1.5;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--primary-gradient);
    color: var(--white);
    box-shadow: 0 4px 14px rgba(79, 70, 229, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.35);
    color: var(--white);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--gray-200);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    background: var(--surface-hover);
}

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

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

.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-base);
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--border-radius-sm);
}

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

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-control::placeholder {
    color: var(--text-muted);
}

.form-control.is-invalid {
    border-color: var(--danger);
}

.invalid-feedback {
    display: block;
    margin-top: var(--space-1);
    font-size: var(--font-size-xs);
    color: var(--danger);
}

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

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-3) center;
    background-size: 18px;
    padding-right: var(--space-10);
}

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

.form-check-input {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

/* Input Group */
.input-group {
    display: flex;
    align-items: stretch;
}

.input-group .form-control {
    flex: 1;
    border-radius: var(--border-radius-sm) 0 0 var(--border-radius-sm);
}

.input-group-text {
    display: flex;
    align-items: center;
    padding: var(--space-3) var(--space-4);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-left: none;
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
    color: var(--text-secondary);
}

/* ===== TABLES ===== */
.table-responsive {
    overflow-x: auto;
}

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

.table th,
.table td {
    padding: var(--space-4);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    background: var(--bg-primary);
    white-space: nowrap;
}

.table tbody tr:hover {
    background: var(--surface-hover);
}

.table-striped tbody tr:nth-child(even) {
    background: var(--bg-primary);
}

/* ===== STATUS BADGES ===== */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-xs);
    font-weight: 500;
    border-radius: 20px;
    color: var(--white);
}

.badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-xs);
    font-weight: 500;
    border-radius: 20px;
}

.badge-primary {
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary);
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

/* ===== FILE UPLOAD ===== */
.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--space-12);
    text-align: center;
    background: var(--bg-primary);
    transition: var(--transition);
    cursor: pointer;
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--primary);
    background: rgba(79, 70, 229, 0.05);
}

.upload-zone i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: var(--space-4);
    display: block;
}

.upload-zone h4 {
    margin-bottom: var(--space-2);
}

.upload-zone p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.upload-preview {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    margin-top: var(--space-4);
}

.upload-preview-item {
    position: relative;
    width: 120px;
    height: 120px;
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.upload-preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.upload-preview-item .remove-btn {
    position: absolute;
    top: var(--space-1);
    right: var(--space-1);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--danger);
    color: var(--white);
    border-radius: 50%;
    border: none;
    cursor: pointer;
    font-size: var(--font-size-xs);
}

/* ===== ALERTS ===== */
.alert {
    padding: var(--space-4) var(--space-5);
    border-radius: var(--border-radius);
    margin-bottom: var(--space-4);
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.2);
    color: var(--warning);
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

.alert-info {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    color: var(--info);
}

/* ===== MODAL ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

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

.modal {
    background: var(--surface);
    border-radius: var(--border-radius-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow: hidden;
    transform: scale(0.9);
    transition: var(--transition);
}

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

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

.modal-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--border-radius-sm);
}

.modal-close:hover {
    background: var(--surface-hover);
}

.modal-body {
    padding: var(--space-6);
    overflow-y: auto;
}

.modal-footer {
    padding: var(--space-5) var(--space-6);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
}

/* ===== DROPDOWN ===== */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 200px;
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
}

.dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(var(--space-2));
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    color: var(--text-primary);
    transition: var(--transition);
}

.dropdown-item:hover {
    background: var(--surface-hover);
}

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

/* ===== GRID ===== */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(var(--space-3) * -1);
}

.col {
    flex: 1;
    padding: 0 var(--space-3);
}

.col-6 {
    flex: 0 0 50%;
    max-width: 50%;
}

.col-4 {
    flex: 0 0 33.333%;
    max-width: 33.333%;
}

.col-3 {
    flex: 0 0 25%;
    max-width: 25%;
}

.col-12 {
    flex: 0 0 100%;
    max-width: 100%;
}

.grid {
    display: grid;
    gap: var(--space-6);
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* ===== AUTH PAGES ===== */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    background: linear-gradient(135deg, #4F46E5 0%, #7C3AED 50%, #06B6D4 100%);
}

.auth-card {
    width: 100%;
    max-width: 440px;
    background: var(--surface);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
    padding: var(--space-10);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.auth-logo {
    width: 60px;
    height: 60px;
    background: var(--primary-gradient);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-5);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--white);
}

.auth-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--space-2);
}

.auth-subtitle {
    color: var(--text-secondary);
}

.auth-footer {
    text-align: center;
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--border-color);
}

/* ===== EMPTY STATE ===== */
.empty-state {
    text-align: center;
    padding: var(--space-12);
}

.empty-state i {
    font-size: 4rem;
    color: var(--text-muted);
    margin-bottom: var(--space-4);
}

.empty-state h4 {
    margin-bottom: var(--space-2);
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
}

/* ===== UTILITIES ===== */
.d-flex {
    display: flex;
}

.d-block {
    display: block;
}

.d-none {
    display: none;
}

.align-center {
    align-items: center;
}

.justify-between {
    justify-content: space-between;
}

.justify-end {
    justify-content: flex-end;
}

.gap-2 {
    gap: var(--space-2);
}

.gap-3 {
    gap: var(--space-3);
}

.gap-4 {
    gap: var(--space-4);
}

.mt-2 {
    margin-top: var(--space-2);
}

.mt-4 {
    margin-top: var(--space-4);
}

.mt-6 {
    margin-top: var(--space-6);
}

.mb-2 {
    margin-bottom: var(--space-2);
}

.mb-4 {
    margin-bottom: var(--space-4);
}

.mb-6 {
    margin-bottom: var(--space-6);
}

.p-4 {
    padding: var(--space-4);
}

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

.w-100 {
    width: 100%;
}

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

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

.fw-medium {
    font-weight: 500;
}

.fw-bold {
    font-weight: 700;
}

/* ===== LOADING ===== */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
}

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

.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 3000;
}

[data-theme="dark"] .loading-overlay {
    background: rgba(15, 23, 42, 0.8);
}

/* ===== RESPONSIVE ===== */

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

    .col-8 {
        flex: 0 0 100%;
        max-width: 100%;
    }

    .col-4 {
        flex: 0 0 100%;
        max-width: 100%;
    }
}

/* Small tablet / landscape mobile */
@media (max-width: 992px) {
    :root {
        --sidebar-width: 260px;
    }

    .sidebar {
        transform: translateX(-100%);
        box-shadow: var(--shadow-lg);
    }

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

    .main-wrapper {
        margin-left: 0;
    }

    .header {
        left: 0;
        padding: 0 var(--space-4);
    }

    .main-content {
        padding: var(--space-4);
    }

    .grid-3,
    .grid-2 {
        grid-template-columns: 1fr;
    }

    .header-search {
        display: none;
    }

    .col-6,
    .col-4,
    .col-3 {
        flex: 0 0 100%;
        max-width: 100%;
    }

    .row {
        flex-direction: column;
    }

    /* Overlay when sidebar is open */
    .sidebar-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.3s ease, visibility 0.3s ease;
    }

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

/* Mobile breakpoint */
@media (max-width: 768px) {
    :root {
        --font-size-base: 0.9375rem;
        --font-size-sm: 0.8125rem;
        --font-size-xs: 0.75rem;
        --space-6: 16px;
        --space-8: 24px;
    }

    .grid-4 {
        grid-template-columns: 1fr;
    }

    .page-title {
        font-size: var(--font-size-lg);
    }

    .user-info {
        display: none;
    }

    .user-menu i.ti-chevron-down {
        display: none;
    }

    .auth-container {
        padding: var(--space-4);
    }

    .auth-card {
        padding: var(--space-5);
        border-radius: var(--border-radius);
    }

    /* Stat cards stack vertically */
    .stat-card {
        padding: var(--space-4);
    }

    .stat-icon {
        width: 48px;
        height: 48px;
        font-size: 1.25rem;
    }

    .stat-value {
        font-size: var(--font-size-xl);
    }

    /* Table responsive */
    .table-responsive {
        margin: 0 calc(-1 * var(--space-4));
        padding: 0 var(--space-4);
        -webkit-overflow-scrolling: touch;
    }

    .table th,
    .table td {
        padding: var(--space-2) var(--space-3);
        font-size: var(--font-size-sm);
        white-space: nowrap;
    }

    .table .btn-icon {
        width: 32px;
        height: 32px;
    }

    /* Cards */
    .card-header,
    .card-body,
    .card-footer {
        padding: var(--space-4);
    }

    .card-header {
        flex-wrap: wrap;
        gap: var(--space-3);
    }

    /* Forms */
    .form-control {
        padding: var(--space-3);
        font-size: 16px;
        /* Prevent iOS zoom */
    }

    .btn {
        padding: var(--space-3) var(--space-4);
        font-size: var(--font-size-sm);
    }

    .btn-lg {
        padding: var(--space-3) var(--space-6);
        width: 100%;
    }

    /* Button actions row */
    .d-flex.gap-2 {
        flex-wrap: wrap;
    }

    /* Dropdown menu */
    .dropdown-menu {
        min-width: 200px;
    }

    /* Modal */
    .modal-content {
        margin: var(--space-4);
        max-height: calc(100vh - 32px);
        overflow-y: auto;
    }

    /* Upload zone */
    .upload-zone {
        padding: var(--space-6);
    }

    .upload-zone i {
        font-size: 2rem;
    }

    /* Invoice view sticky sidebar becomes static */
    .card[style*="sticky"] {
        position: static !important;
    }

    /* Flex direction changes */
    .d-flex.align-center.justify-between {
        flex-direction: column;
        align-items: flex-start !important;
        gap: var(--space-3);
    }

    .d-flex.align-center.justify-between>* {
        width: 100%;
    }

    /* Tabs */
    .tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        flex-wrap: nowrap;
    }

    .tab-btn {
        white-space: nowrap;
        flex-shrink: 0;
    }

    /* Alerts */
    .alert {
        padding: var(--space-3);
        font-size: var(--font-size-sm);
    }
}

/* Extra small mobile */
@media (max-width: 480px) {
    .header {
        padding: 0 var(--space-3);
    }

    .main-content {
        padding: var(--space-3);
    }

    .sidebar-toggle {
        width: 36px;
        height: 36px;
    }

    .theme-toggle,
    .notification-btn {
        width: 36px;
        height: 36px;
    }

    .user-avatar {
        width: 36px;
        height: 36px;
        font-size: var(--font-size-sm);
    }

    .card {
        border-radius: var(--border-radius-sm);
    }

    /* Two column grid for very small items */
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-3);
    }

    .stat-card {
        flex-direction: column;
        text-align: center;
    }

    /* Full width buttons */
    .btn {
        width: 100%;
        justify-content: center;
    }

    .btn.btn-sm,
    .btn.btn-icon {
        width: auto;
    }

    /* Hide action buttons text on mobile */
    .table .btn span {
        display: none;
    }
}

/* Touch friendly improvements */
@media (hover: none) and (pointer: coarse) {

    .btn,
    .nav-link,
    .dropdown-item,
    .tab-btn {
        min-height: 44px;
    }

    .form-control,
    .form-select {
        min-height: 44px;
    }

    .table tbody tr {
        cursor: pointer;
    }

    /* Remove hover effects on touch */
    .btn:hover {
        transform: none;
    }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.3s ease;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

.pulse {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes slideIn {
    from {
        transform: translateX(-100%);
    }

    to {
        transform: translateX(0);
    }
}

.slide-in {
    animation: slideIn 0.3s ease;
}

/* ===== PRINT STYLES ===== */
@media print {

    .sidebar,
    .header,
    .btn,
    .upload-zone,
    .sidebar-overlay {
        display: none !important;
    }

    .main-wrapper {
        margin: 0;
    }

    .main-content {
        padding: 0;
        margin: 0;
    }

    .card {
        box-shadow: none;
        border: 1px solid #ddd;
        page-break-inside: avoid;
    }

    body {
        background: white;
        color: black;
    }
}