/* ====================================
   Design System & CSS Variables
   ==================================== */
:root {
    /* Colors - Dark Blue & White Theme */
    --primary-blue: #1e40af;
    --primary-blue-light: #3b82f6;
    --primary-blue-dark: #1e3a8a;
    --accent-blue: #60a5fa;
    --dark-bg: #0f172a;
    --dark-card: #1e293b;
    --dark-card-hover: #334155;
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --success: #10b981;
    --error: #ef4444;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --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: 2rem;

    /* 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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.3);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

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

body {
    font-family: var(--font-family);
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    color: var(--white);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ====================================
   Layout Components
   ==================================== */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* Header */
.header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    animation: fadeInDown 0.6s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--white);
}

.header-actions {
    display: flex;
    gap: var(--spacing-md);
}

.btn-account {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--dark-card);
    border: 1px solid var(--gray-600);
    border-radius: var(--radius-lg);
    color: var(--white);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: var(--font-family);
}

.btn-account:hover {
    background: var(--dark-card-hover);
    border-color: var(--primary-blue-light);
    transform: translateY(-1px);
}

.btn-account.logged-in {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    border-color: var(--primary-blue-light);
}

.tagline {
    color: var(--gray-400);
    font-size: var(--font-size-lg);
    font-weight: 300;
}

/* Step Indicator */
.step-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-xl);
    animation: fadeIn 0.8s ease;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.step-number {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--dark-card);
    border: 2px solid var(--gray-600);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--gray-400);
    transition: all var(--transition-base);
}

.step.active .step-number {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    border-color: var(--primary-blue-light);
    color: var(--white);
    box-shadow: var(--shadow-glow);
    transform: scale(1.1);
}

.step.completed .step-number {
    background: var(--success);
    border-color: var(--success);
    color: var(--white);
}

.step-label {
    font-size: var(--font-size-sm);
    color: var(--gray-400);
    font-weight: 500;
    white-space: nowrap;
}

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

.step-line {
    width: 120px;
    height: 2px;
    background: var(--gray-600);
    margin: 0 var(--spacing-md);
    position: relative;
    top: -20px;
}

/* Main Content */
.main-content {
    animation: fadeInUp 0.8s ease;
}

/* Section Styles */
.input-section,
.processing-section,
.results-section {
    transition: opacity var(--transition-base), transform var(--transition-base);
}

.hidden {
    display: none;
    opacity: 0;
    transform: translateY(20px);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-header h1 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--white) 0%, var(--gray-300) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-header p {
    color: var(--gray-400);
    font-size: var(--font-size-lg);
}

/* ====================================
   Form Components
   ==================================== */
.invoice-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
}

.form-card {
    background: var(--dark-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
}

.form-card:hover {
    border-color: rgba(59, 130, 246, 0.3);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--white);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.card-header-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--gray-300);
    margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--dark-bg);
    border: 1px solid var(--gray-600);
    border-radius: var(--radius-md);
    color: var(--white);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    transition: all var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-blue-light);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--gray-500);
}

.form-group input[readonly] {
    background: var(--gray-800);
    cursor: not-allowed;
    color: var(--gray-400);
}

/* Logo Upload */
.logo-upload-container {
    position: relative;
}

.file-input {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
    z-index: 2;
}

.logo-preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xl);
    background: var(--dark-bg);
    border: 2px dashed var(--gray-600);
    border-radius: var(--radius-md);
    color: var(--gray-400);
    transition: all var(--transition-base);
    cursor: pointer;
    min-height: 140px;
}

.logo-preview:hover {
    border-color: var(--primary-blue-light);
    color: var(--primary-blue-light);
}

.logo-preview svg {
    color: var(--gray-500);
    transition: color var(--transition-base);
}

.logo-preview:hover svg {
    color: var(--primary-blue-light);
}

.logo-preview img {
    max-width: 100%;
    max-height: 120px;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

.logo-preview.has-image {
    border-style: solid;
    border-color: var(--success);
}

/* Currency Select */
.currency-select {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--dark-bg);
    border: 1px solid var(--gray-600);
    border-radius: var(--radius-md);
    color: var(--white);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-base);
}

.currency-select:focus {
    outline: none;
    border-color: var(--primary-blue-light);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.currency-select option {
    background: var(--dark-card);
    color: var(--white);
    padding: var(--spacing-sm);
}

/* Toggle Switch */
.toggle-container {
    padding: var(--spacing-md) 0;
}

.toggle-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.toggle-label span {
    font-size: var(--font-size-base);
    color: var(--gray-300);
    font-weight: 500;
}

.toggle-switch {
    position: relative;
    width: 52px;
    height: 28px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gray-600);
    border-radius: 28px;
    transition: all var(--transition-base);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 4px;
    background: var(--white);
    border-radius: 50%;
    transition: all var(--transition-base);
}

.toggle-switch input:checked+.toggle-slider {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
}

.toggle-switch input:checked+.toggle-slider:before {
    transform: translateX(24px);
}

.toggle-switch input:focus+.toggle-slider {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}


/* Date Input with Calendar Icon */
.date-input-wrapper {
    position: relative;
}

.date-input-wrapper input[type="date"] {
    padding-right: var(--spacing-2xl);
}

.calendar-icon {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    pointer-events: none;
}

.date-input-wrapper input[type="date"]::-webkit-calendar-picker-indicator {
    opacity: 0;
    cursor: pointer;
    position: absolute;
    right: 0;
    width: 100%;
    height: 100%;
}

/* Currency Card */
.currency-card {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, rgba(30, 64, 175, 0.1) 0%, rgba(59, 130, 246, 0.05) 100%);
    border-color: rgba(59, 130, 246, 0.3);
}

.currency-card:hover {
    border-color: rgba(59, 130, 246, 0.5);
}


/* Items Card */
.items-card {
    grid-column: 1 / -1;
}

.items-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.item-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr auto;
    gap: var(--spacing-md);
    align-items: end;
    padding: var(--spacing-md);
    background: var(--dark-bg);
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    transition: all var(--transition-base);
}

.item-row:hover {
    border-color: rgba(59, 130, 246, 0.2);
}

.btn-add-item {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--primary-blue-light);
    border-radius: var(--radius-md);
    color: var(--primary-blue-light);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-add-item:hover {
    background: var(--primary-blue-light);
    color: var(--white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-remove-item {
    width: 40px;
    height: 40px;
    background: transparent;
    border: 1px solid var(--error);
    border-radius: var(--radius-md);
    color: var(--error);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.btn-remove-item:hover {
    background: var(--error);
    color: var(--white);
}

/* Total Summary */
.total-summary {
    background: var(--dark-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    max-width: 400px;
    margin-left: auto;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--gray-700);
    font-size: var(--font-size-base);
    color: var(--gray-300);
}

.summary-row:last-child {
    border-bottom: none;
}

.total-row {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--white);
    padding-top: var(--spacing-lg);
}

.summary-value {
    font-weight: 600;
    color: var(--white);
}

/* Buttons */
.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    font-family: var(--font-family);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    color: var(--white);
    box-shadow: var(--shadow-lg);
    width: 100%;
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: var(--font-size-lg);
    margin-top: var(--spacing-lg);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--gray-600);
    color: var(--white);
}

.btn-secondary:hover {
    background: var(--dark-card);
    border-color: var(--gray-500);
    transform: translateY(-1px);
}

/* ====================================
   Processing Section
   ==================================== */
.processing-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 500px;
}

.processing-card {
    text-align: center;
    background: var(--dark-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    max-width: 500px;
    width: 100%;
}

.spinner {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-xl);
    border: 4px solid var(--gray-700);
    border-top-color: var(--primary-blue-light);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.processing-card h2 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
    color: var(--white);
}

.processing-status {
    color: var(--gray-400);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--gray-700);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    border-radius: var(--radius-lg);
    width: 0%;
    transition: width var(--transition-slow);
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% {
        opacity: 0.6;
    }

    50% {
        opacity: 1;
    }

    100% {
        opacity: 0.6;
    }
}

/* ====================================
   Results Section
   ==================================== */
.results-section {
    animation: fadeInUp 0.6s ease;
}

.results-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.success-icon {
    margin-bottom: var(--spacing-lg);
    animation: scaleIn 0.5s ease;
}

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

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.results-header h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-sm);
    color: var(--white);
}

.results-header p {
    color: var(--gray-400);
    font-size: var(--font-size-lg);
}

.invoice-preview-card {
    background: var(--dark-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--gray-700);
}

.preview-header h3 {
    font-size: var(--font-size-xl);
    color: var(--white);
}

.preview-badge {
    padding: var(--spacing-xs) var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    color: var(--white);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.preview-content {
    background: var(--white);
    color: var(--gray-900);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-md);
    min-height: 400px;
}

.results-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.results-actions .btn-primary,
.results-actions .btn-secondary {
    width: auto;
    margin-top: 0;
}

/* ====================================
   Invoice Preview Styles
   ==================================== */
.invoice-document {
    max-width: 800px;
    margin: 0 auto;
}

.invoice-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 3px solid var(--primary-blue);
}

.invoice-logo h2 {
    font-size: var(--font-size-3xl);
    color: var(--primary-blue);
    margin-bottom: var(--spacing-xs);
}

.invoice-title {
    font-size: var(--font-size-2xl);
    color: var(--gray-600);
    text-align: right;
}

.invoice-meta {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.invoice-party h3 {
    font-size: var(--font-size-lg);
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.invoice-party p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.invoice-details {
    background: var(--gray-100);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
}

.invoice-details p {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.invoice-details strong {
    color: var(--gray-900);
}

.invoice-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing-xl);
}

.invoice-table thead {
    background: var(--primary-blue);
    color: var(--white);
}

.invoice-table th,
.invoice-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.invoice-table th {
    font-weight: 600;
    font-size: var(--font-size-sm);
}

.invoice-table td {
    color: var(--gray-700);
}

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

.invoice-totals {
    max-width: 300px;
    margin-left: auto;
}

.invoice-totals-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--gray-200);
}

.invoice-totals-row.total {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-blue);
    border-top: 2px solid var(--primary-blue);
    border-bottom: none;
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.invoice-notes {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-blue);
}

.invoice-notes h4 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.invoice-notes p {
    color: var(--gray-600);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

/* Footer */
.footer {
    text-align: center;
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--gray-700);
    color: var(--gray-500);
    font-size: var(--font-size-sm);
}

/* ====================================
   Authentication Modal
   ==================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

.modal-overlay.hidden {
    display: none;
}

.modal-content {
    background: var(--dark-card);
    border: 1px solid var(--gray-700);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    max-width: 480px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    animation: scaleIn 0.3s ease;
    box-shadow: var(--shadow-xl);
}

.modal-close {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    background: transparent;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

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

.auth-form h2 {
    font-size: var(--font-size-3xl);
    color: var(--white);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.auth-subtitle {
    color: var(--gray-400);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.auth-form form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.auth-switch {
    text-align: center;
    margin-top: var(--spacing-lg);
    color: var(--gray-400);
    font-size: var(--font-size-sm);
}

.auth-switch a {
    color: var(--primary-blue-light);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-base);
}

.auth-switch a:hover {
    color: var(--accent-blue);
    text-decoration: underline;
}

/* User Dashboard */
.user-profile {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--gray-700);
}

.user-avatar {
    margin: 0 auto var(--spacing-lg);
    animation: scaleIn 0.5s ease;
}

.user-profile h2 {
    font-size: var(--font-size-2xl);
    color: var(--white);
    margin-bottom: var(--spacing-xs);
}

.user-profile p {
    color: var(--gray-400);
    font-size: var(--font-size-base);
}

.saved-invoices-section {
    margin-bottom: var(--spacing-xl);
}

.saved-invoices-section h3 {
    font-size: var(--font-size-xl);
    color: var(--white);
    margin-bottom: var(--spacing-lg);
}

.saved-invoices-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-height: 300px;
    overflow-y: auto;
}

.empty-state {
    text-align: center;
    color: var(--gray-500);
    padding: var(--spacing-2xl);
    font-style: italic;
}

.invoice-item {
    background: var(--dark-bg);
    border: 1px solid var(--gray-700);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all var(--transition-base);
    cursor: pointer;
}

.invoice-item:hover {
    border-color: var(--primary-blue-light);
    transform: translateX(4px);
}

.invoice-item-info h4 {
    color: var(--white);
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-xs);
}

.invoice-item-info p {
    color: var(--gray-400);
    font-size: var(--font-size-sm);
}

.invoice-item-amount {
    color: var(--primary-blue-light);
    font-weight: 700;
    font-size: var(--font-size-lg);
}

.invoice-item-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-icon {
    background: transparent;
    border: 1px solid var(--gray-600);
    border-radius: var(--radius-md);
    padding: var(--spacing-xs);
    color: var(--gray-400);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: var(--gray-700);
    color: var(--white);
    border-color: var(--gray-500);
}

.btn-icon.delete:hover {
    background: var(--error);
    border-color: var(--error);
    color: var(--white);
}

.btn-save {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    font-family: var(--font-family);
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

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

.btn-save.hidden {
    display: none;
}

/* ====================================
   Animations
   ==================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }

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

/* ====================================
   Responsive Design
   ==================================== */
@media (max-width: 1024px) {
    .form-grid {
        grid-template-columns: 1fr;
    }

    .step-line {
        width: 80px;
    }
}

@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .step-indicator {
        padding: var(--spacing-md);
    }

    .step-line {
        width: 40px;
    }

    .step-label {
        font-size: 0.75rem;
    }

    .item-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .invoice-header {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .invoice-title {
        text-align: left;
    }

    .invoice-meta {
        grid-template-columns: 1fr;
    }

    .results-actions {
        flex-direction: column;
    }

    .results-actions .btn-primary,
    .results-actions .btn-secondary {
        width: 100%;
    }
}