/* 
 * Invoice Generator - Zoho-Inspired Professional Design
 * Clean, modern, and business-focused interface
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Poppins:wght@400;500;600;700&display=swap');

/* ============================================================================
   CSS VARIABLES - Professional Color Scheme
   ============================================================================ */
:root {
    /* ===== Enhanced Color Palette ===== */
    --color-primary: #3b82f6;
    --color-primary-dark: #2563eb;
    --color-primary-light: #60a5fa;
    --color-primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --color-secondary: #64748b;
    --color-success: #10b981;
    --color-danger: #ef4444;
    --color-warning: #f59e0b;
    --color-info: #3b82f6;

    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    /* Semantic Colors (retained for specific backgrounds) */
    --color-success-bg: #d1fae5;
    --color-warning-bg: #fef3c7;
    --color-danger-bg: #fee2e2;
    --color-info-bg: #dbeafe;

    /* Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    /* Retained from original */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -1px rgb(0 0 0 / 0.06);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -2px rgb(0 0 0 / 0.05);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 10px 10px -5px rgb(0 0 0 / 0.04);
    --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.3);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Poppins', sans-serif;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    /* Retained from original */
    --radius-md: 0.5rem;
    /* Retained from original */
    --radius-lg: 0.75rem;
    /* Retained from original */
    --radius-xl: 1rem;
    /* Retained from original */
    --radius-full: 9999px;
    --border-radius: 0.75rem;
    /* New variable */

    /* Transitions */
    --transition-speed: 0.3s;
    /* New variable */
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--color-gray-900);
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    background-attachment: fixed;
    min-height: 100vh;
}

/* ============================================================================
   TYPOGRAPHY
   ============================================================================ */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-gray-900);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.75rem;
}

h4 {
    font-size: 1.5rem;
}

h5 {
    font-size: 1.25rem;
}

h6 {
    font-size: 1rem;
}

p {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-md);
}

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

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

/* ============================================================================
   LAYOUT
   ============================================================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-lg);
}

/* Navigation Bar */
.navbar {
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

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

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    font-family: var(--font-display);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.navbar-brand svg {
    width: 32px;
    height: 32px;
}

.navbar-nav {
    display: flex;
    gap: var(--spacing-sm);
    list-style: none;
    align-items: center;
}

.nav-link {
    color: var(--color-gray-700);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    font-weight: 500;
}

.nav-link:hover {
    color: var(--color-primary);
    background: var(--color-gray-100);
    /* Changed from --color-primary-bg */
}

.nav-link.active {
    color: var(--color-primary);
    background: var(--color-gray-100);
    /* Changed from --color-primary-bg */
}

/* Sidebar Layout */
.app-layout {
    display: flex;
    min-height: calc(100vh - 65px);
}

.sidebar {
    width: 250px;
    background: var(--color-white);
    border-right: 1px solid var(--color-gray-200);
    padding: var(--spacing-lg);
}

.sidebar-nav {
    list-style: none;
}

.sidebar-nav li {
    margin-bottom: var(--spacing-xs);
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    color: var(--color-gray-700);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    font-weight: 500;
}

.sidebar-link:hover {
    background: var(--color-gray-100);
    color: var(--color-primary);
}

.sidebar-link.active {
    background: var(--color-gray-100);
    /* Changed from --color-primary-bg */
    color: var(--color-primary);
}

.sidebar-link svg {
    width: 20px;
    height: 20px;
}

.main-content {
    flex: 1;
    padding: var(--spacing-xl);
    background: var(--color-gray-50);
}

/* ============================================================================
   CARDS
   ==================================================================/* ===== Cards ===== */
.card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    margin-bottom: 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all var(--transition-speed) ease;
}

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

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-gray-200);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-gray-900);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.card-body {
    color: var(--color-gray-600);
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

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

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.stat-icon.primary {
    background: var(--color-primary-bg);
    color: var(--color-primary);
}

.stat-icon.success {
    background: var(--color-success-bg);
    color: var(--color-success);
}

.stat-icon.warning {
    background: var(--color-warning-bg);
    color: var(--color-warning);
}

.stat-icon.danger {
    background: var(--color-danger-bg);
    color: var(--color-danger);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    color: var(--color-gray-500);
    font-size: 0.875rem;
    font-weight: 500;
}

/* ============================================================================
   BUTTONS
   ==================================================================/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

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

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

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

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

.btn-outline {
    background: transparent;
    border: 1px solid var(--color-gray-300);
    color: var(--color-gray-700);
}

.btn-outline:hover {
    background: var(--color-gray-100);
    border-color: var(--color-gray-400);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray-700);
    font-weight: 500;
    font-size: 0.875rem;
}

.form-label.required::after {
    content: ' *';
    color: var(--color-danger);
}

.form-control {
    width: 100%;
    padding: 0.625rem 0.875rem;
    background: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    color: var(--color-gray-900);
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-bg);
}

.form-control::placeholder {
    color: var(--color-gray-400);
}

textarea.form-control {
    min-height: 100px;
    resize: vertical;
}

select.form-control {
    cursor: pointer;
}

.form-help {
    font-size: 0.75rem;
    color: var(--color-gray-500);
    margin-top: var(--spacing-xs);
}

.form-error {
    font-size: 0.75rem;
    color: var(--color-danger);
    margin-top: var(--spacing-xs);
}

/* ============================================================================
   TABLES
   ============================================================================ */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-200);
    background: var(--color-white);
}

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

.table thead {
    background: var(--color-gray-50);
    border-bottom: 2px solid var(--color-gray-200);
}

.table th {
    padding: 0.875rem 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--color-gray-700);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.table td {
    padding: 1rem;
    border-bottom: 1px solid var(--color-gray-200);
    font-size: 0.875rem;
}

.table tbody tr {
    transition: background 0.15s ease;
}

.table tbody tr:hover {
    background: var(--color-gray-50);
}

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

/* ============================================================================
   BADGES
   ============================================================================ */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-primary {
    background: var(--color-primary-bg);
    color: var(--color-primary);
}

.badge-success {
    background: var(--color-success-bg);
    color: var(--color-success);
}

.badge-warning {
    background: var(--color-warning-bg);
    color: var(--color-warning);
}

.badge-danger {
    background: var(--color-danger-bg);
    color: var(--color-danger);
}

/* ============================================================================
   ALERTS
   ============================================================================ */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid;
    display: flex;
    align-items: start;
    gap: var(--spacing-md);
}

.alert-success {
    background: var(--color-success-bg);
    border-color: var(--color-success);
    color: #065f46;
}

.alert-danger {
    background: var(--color-danger-bg);
    border-color: var(--color-danger);
    color: #991b1b;
}

.alert-warning {
    background: var(--color-warning-bg);
    border-color: var(--color-warning);
    color: #92400e;
}

.alert-info {
    background: var(--color-info-bg);
    border-color: var(--color-info);
    color: #1e40af;
}

/* ============================================================================
   MODALS
   ============================================================================ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    animation: fadeIn 0.2s ease;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }

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

.modal-header {
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--color-gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-gray-400);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}

.modal-close:hover {
    background: var(--color-gray-100);
    color: var(--color-gray-700);
}

.modal-body {
    padding: var(--spacing-xl);
}

.modal-footer {
    padding: var(--spacing-xl);
    border-top: 1px solid var(--color-gray-200);
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
}

/* ============================================================================
   UTILITIES
   ============================================================================ */
.text-center {
    text-align: center;
}

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

.text-muted {
    color: var(--color-gray-500);
}

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

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

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

.mt-0 {
    margin-top: 0;
}

.mt-1 {
    margin-top: var(--spacing-sm);
}

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

.mt-3 {
    margin-top: var(--spacing-lg);
}

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

.mb-0 {
    margin-bottom: 0;
}

.mb-1 {
    margin-bottom: var(--spacing-sm);
}

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

.mb-3 {
    margin-bottom: var(--spacing-lg);
}

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

.flex {
    display: flex;
}

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

.flex-center {
    justify-content: center;
    align-items: center;
}

.flex-wrap {
    flex-wrap: wrap;
}

.gap-1 {
    gap: var(--spacing-sm);
}

.gap-2 {
    gap: var(--spacing-md);
}

.gap-3 {
    gap: var(--spacing-lg);
}

.d-none {
    display: none;
}

.d-block {
    display: block;
}

/* Loading Spinner */
.spinner {
    border: 3px solid var(--color-gray-200);
    border-top: 3px solid var(--color-primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 0.8s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--color-gray-500);
}

.empty-state svg {
    width: 80px;
    height: 80px;
    margin-bottom: var(--spacing-lg);
    color: var(--color-gray-300);
}

/* ============================================================================
   RESPONSIVE
   ============================================================================ */
@media (max-width: 768px) {
    .app-layout {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--color-gray-200);
    }

    .sidebar-nav {
        display: flex;
        overflow-x: auto;
        gap: var(--spacing-sm);
    }

    .sidebar-nav li {
        margin-bottom: 0;
    }

    .main-content {
        padding: var(--spacing-md);
    }

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

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    h3 {
        font-size: 1.5rem;
    }
}