/* Modern Elegant Design for Devis Generator */

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

:root {
    /* Colors - Refined Palette */
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #6366f1;
    --secondary: #7c3aed;
    --success: #059669;
    --danger: #dc2626;
    --warning: #d97706;
    --info: #0891b2;
    
    /* Neutrals */
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-300: #d4d4d4;
    --gray-400: #a3a3a3;
    --gray-500: #737373;
    --gray-600: #525252;
    --gray-700: #404040;
    --gray-800: #262626;
    --gray-900: #171717;
    
    /* Gradients - Softer */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-primary-soft: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --gradient-danger: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    
    /* Shadows - Subtle */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.08), 0 1px 2px 0 rgba(0, 0, 0, 0.04);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.03);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
    
    /* Spacing - Optimized */
    --spacing-xs: 0.375rem;
    --spacing-sm: 0.625rem;
    --spacing-md: 0.875rem;
    --spacing-lg: 1.25rem;
    --spacing-xl: 1.75rem;
    --spacing-2xl: 2.5rem;
    
    /* Border Radius - Modern */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.25rem;
    --radius-2xl: 1.75rem;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    color: var(--gray-700);
    line-height: 1.7;
    min-height: 100vh;
    padding: var(--spacing-lg);
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: white;
    animation: fadeInDown 0.6s ease-out;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    letter-spacing: -0.025em;
}

.header p {
    font-size: 1rem;
    opacity: 0.95;
    font-weight: 300;
    letter-spacing: 0.01em;
}

/* Navigation */
.nav {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeIn 0.6s ease-out 0.2s both;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.nav-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: var(--radius-lg);
    color: white;
    font-weight: 500;
    font-size: 0.9375rem;
    text-decoration: none;
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.nav-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.nav-btn:hover::before {
    opacity: 1;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
    box-shadow: 0 8px 16px -4px rgba(0, 0, 0, 0.15);
}

.nav-btn.active {
    background: white;
    color: var(--primary);
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* Card */
.card {
    background: white;
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.5s ease-out;
    border: 1px solid rgba(0, 0, 0, 0.04);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Glassmorphism Card */
.glass-card {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(24px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
    color: white;
}

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

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--gray-700);
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.9375rem;
    transition: all var(--transition-base);
    background: white;
    font-weight: 400;
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
    border-color: var(--gray-300);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.08);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
    line-height: 1.6;
}

.form-input::placeholder {
    color: var(--gray-400);
    font-weight: 300;
}

/* Grid Layout */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

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

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

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

@media (max-width: 768px) {
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
}

/* Buttons */
.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.btn::after {
    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 var(--transition-slow), height var(--transition-slow);
}

.btn:active::after {
    width: 300px;
    height: 300px;
}

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

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-success:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-danger:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
    border: 1px solid var(--gray-200);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-200);
    border-color: var(--gray-300);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.8125rem;
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: 1rem;
}

/* Items Table */
.items-table {
    width: 100%;
    margin: var(--spacing-lg) 0;
    border-collapse: separate;
    border-spacing: 0;
    overflow: hidden;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
}

.items-table thead {
    background: var(--gradient-primary);
    color: white;
}

.items-table th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 500;
    text-transform: uppercase;
    font-size: 0.6875rem;
    letter-spacing: 0.06em;
}

.items-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--gray-100);
    background: white;
    font-size: 0.9375rem;
}

.items-table tbody tr {
    transition: background-color var(--transition-fast);
}

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

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

.items-table input {
    width: 100%;
    padding: var(--spacing-xs);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.875rem;
    transition: all var(--transition-base);
}

.items-table input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.08);
}

/* Preview Panel */
.preview-panel {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    min-height: 600px;
    position: sticky;
    top: var(--spacing-lg);
}

.preview-content {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    font-size: 0.875rem;
    line-height: 1.7;
}

/* 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: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
    transition: all var(--transition-base);
    border-left: 3px solid var(--primary);
    border: 1px solid var(--gray-100);
    border-left: 3px solid var(--primary);
}

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

.stat-label {
    font-size: 0.8125rem;
    color: var(--gray-600);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-size: 2.25rem;
    font-weight: 600;
    color: var(--gray-900);
    line-height: 1;
    letter-spacing: -0.02em;
}

/* Color Picker */
.color-picker-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.color-picker {
    width: 60px;
    height: 40px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.color-picker:hover {
    border-color: var(--primary);
    transform: scale(1.02);
    box-shadow: var(--shadow-sm);
}

/* Loading Spinner */
.spinner {
    border: 2px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    animation: spin 0.7s linear infinite;
}

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

/* Toast Notifications */
.toast {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    min-width: 300px;
    animation: slideInRight 0.3s ease-out;
    z-index: 1000;
    border: 1px solid var(--gray-200);
}

@keyframes slideInRight {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast.success {
    border-left: 3px solid var(--success);
}

.toast.error {
    border-left: 3px solid var(--danger);
}

.toast.info {
    border-left: 3px solid var(--info);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease-out;
}

.modal {
    background: white;
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 90%;
    box-shadow: var(--shadow-xl);
    animation: scaleIn 0.3s ease-out;
    border: 1px solid var(--gray-200);
}

@keyframes scaleIn {
    from {
        transform: scale(0.95);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.modal-header {
    margin-bottom: var(--spacing-lg);
}

.modal-title {
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--gray-900);
    letter-spacing: -0.01em;
}

.modal-footer {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    margin-top: var(--spacing-xl);
}

/* Badge */
.badge {
    display: inline-block;
    padding: 0.25rem 0.625rem;
    border-radius: 9999px;
    font-size: 0.6875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

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

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

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

.badge-info {
    background: var(--info);
    color: white;
}

.badge-secondary {
    background: var(--gray-200);
    color: var(--gray-700);
}

/* Utility Classes */
.text-center {
    text-align: center;
}

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

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

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

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

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

.hidden {
    display: none !important;
}

.flex {
    display: flex;
}

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

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

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

/* Wizard Stepper */
.wizard-stepper {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
    position: relative;
    padding: 0 var(--spacing-md);
}

.wizard-stepper::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gray-200);
    z-index: 1;
    transform: translateY(-50%);
}

.step-indicator {
    position: relative;
    z-index: 2;
    background: white;
    padding: 0 var(--spacing-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    transition: all var(--transition-base);
}

.step-number {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: white;
    border: 1px solid var(--gray-300);
    color: var(--gray-500);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
    font-size: 0.875rem;
    transition: all var(--transition-base);
}

.step-label {
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    transition: all var(--transition-base);
}

/* Active Step */
.step-indicator.active .step-number {
    border-color: var(--primary);
    background: var(--primary);
    color: white;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.step-indicator.active .step-label {
    color: var(--primary);
    font-weight: 600;
}

/* Completed Step */
.step-indicator.completed .step-number {
    border-color: var(--success);
    background: var(--success);
    color: white;
}

.step-indicator.completed .step-label {
    color: var(--success);
}

/* Wizard Content */
.wizard-step {
    display: none;
    animation: fadeIn 0.3s ease-out;
}

.wizard-step.active {
    display: block;
}

/* Wizard Navigation */
.wizard-nav {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-200);
}

/* Responsive */
@media (max-width: 768px) {
    body {
        padding: var(--spacing-md);
    }
    
    .header h1 {
        font-size: 1.875rem;
    }
    
    .header p {
        font-size: 0.9375rem;
    }
    
    .card {
        padding: var(--spacing-lg);
    }
    
    .items-table {
        font-size: 0.8125rem;
    }
    
    .items-table th,
    .items-table td {
        padding: var(--spacing-sm);
    }
    
    .preview-panel {
        position: static;
        margin-top: var(--spacing-lg);
    }
    
    .stat-value {
        font-size: 1.875rem;
    }
    
    .wizard-stepper {
        padding: 0;
    }
    
    .step-label {
        font-size: 0.625rem;
    }
    
    .step-number {
        width: 32px;
        height: 32px;
        font-size: 0.8125rem;
    }
}

/* Smooth Scroll */
html {
    scroll-behavior: smooth;
}

/* Selection */
::selection {
    background: var(--primary);
    color: white;
}

/* Focus Visible */
:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}