/* ============================================
   KG Invoice Converter - Design System
   ============================================ */

:root {
    /* Color Palette */
    --bg-primary: #0a0a1a;
    --bg-secondary: #111128;
    --bg-card: rgba(20, 20, 50, 0.6);
    --bg-card-hover: rgba(30, 30, 70, 0.7);
    --bg-glass: rgba(255, 255, 255, 0.03);
    --bg-glass-hover: rgba(255, 255, 255, 0.06);
    
    --text-primary: #e8e8f0;
    --text-secondary: #8888aa;
    --text-muted: #555577;
    --text-accent: #a78bfa;
    
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-tertiary: #a78bfa;
    --accent-glow: rgba(99, 102, 241, 0.3);
    
    --success: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.1);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.1);
    --error: #ef4444;
    --error-bg: rgba(239, 68, 68, 0.1);
    --info: #3b82f6;
    --info-bg: rgba(59, 130, 246, 0.1);
    
    --border-color: rgba(255, 255, 255, 0.06);
    --border-color-hover: rgba(255, 255, 255, 0.12);
    --border-accent: rgba(99, 102, 241, 0.3);
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 30px var(--accent-glow);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

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

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* ============================================
   Animated Background
   ============================================ */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.bg-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.15;
    animation: orbFloat 20s ease-in-out infinite;
}

.bg-orb-1 {
    width: 600px;
    height: 600px;
    background: var(--accent-primary);
    top: -200px;
    right: -100px;
    animation-delay: 0s;
}

.bg-orb-2 {
    width: 500px;
    height: 500px;
    background: var(--accent-secondary);
    bottom: -150px;
    left: -100px;
    animation-delay: -7s;
}

.bg-orb-3 {
    width: 400px;
    height: 400px;
    background: #ec4899;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
    opacity: 0.08;
}

@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(50px, -30px) scale(1.1); }
    50% { transform: translate(-20px, 40px) scale(0.95); }
    75% { transform: translate(30px, 20px) scale(1.05); }
}

/* ============================================
   App Container
   ============================================ */
.app-container {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-lg) var(--space-xl);
}

/* ============================================
   Header
   ============================================ */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg) 0;
    margin-bottom: var(--space-lg);
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.logo-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    box-shadow: var(--shadow-glow);
    animation: logoPulse 3s ease-in-out infinite;
}

.logo-icon svg {
    width: 28px;
    height: 28px;
}

@keyframes logoPulse {
    0%, 100% { box-shadow: 0 0 20px var(--accent-glow); }
    50% { box-shadow: 0 0 40px var(--accent-glow), 0 0 60px rgba(139, 92, 246, 0.15); }
}

.app-title {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-tertiary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.app-subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.header-actions {
    display: flex;
    gap: var(--space-sm);
}

/* ============================================
   Steps Indicator
   ============================================ */
.steps-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
    padding: var(--space-lg);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(20px);
}

.step {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    opacity: 0.4;
    transition: var(--transition-normal);
}

.step.active {
    opacity: 1;
}

.step.completed {
    opacity: 0.8;
}

.step-number {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: var(--bg-glass);
    border: 2px solid var(--border-color);
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--transition-normal);
}

.step.active .step-number {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-color: transparent;
    box-shadow: 0 0 20px var(--accent-glow);
}

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

.step span {
    font-size: 0.9rem;
    font-weight: 500;
}

.step-line {
    width: 60px;
    height: 2px;
    background: var(--border-color);
    border-radius: 1px;
    transition: var(--transition-slow);
}

.step-line.completed {
    background: linear-gradient(90deg, var(--success), var(--accent-primary));
}

/* ============================================
   Sections
   ============================================ */
.section {
    margin-bottom: var(--space-xl);
    animation: fadeInUp 0.5s ease;
}

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

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

.section-header h2 {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.15rem;
    font-weight: 600;
}

/* ============================================
   Upload Area
   ============================================ */
.upload-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-3xl) var(--space-xl);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-xl);
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    text-align: center;
    transition: var(--transition-normal);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, var(--accent-glow), transparent 70%);
    opacity: 0;
    transition: var(--transition-slow);
}

.upload-area:hover,
.upload-area.drag-over {
    border-color: var(--accent-primary);
    background: var(--bg-card-hover);
}

.upload-area:hover::before,
.upload-area.drag-over::before {
    opacity: 0.15;
}

.upload-area.drag-over {
    transform: scale(1.01);
    box-shadow: var(--shadow-glow);
}

.upload-icon {
    color: var(--accent-tertiary);
    margin-bottom: var(--space-lg);
    animation: uploadBounce 2s ease-in-out infinite;
}

@keyframes uploadBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.upload-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.upload-subtitle {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.upload-divider {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    width: 200px;
    margin-bottom: var(--space-lg);
    color: var(--text-muted);
    font-size: 0.85rem;
}

.upload-divider::before,
.upload-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

.upload-note {
    margin-top: var(--space-md);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-normal);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px var(--accent-glow);
}

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

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

.btn-outline:hover {
    background: var(--bg-glass-hover);
    border-color: var(--accent-primary);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    color: var(--text-primary);
    background: var(--bg-glass-hover);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
    border-radius: var(--radius-lg);
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-md);
    background: var(--bg-glass);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-normal);
}

.btn-icon:hover {
    background: var(--bg-glass-hover);
    color: var(--text-primary);
}

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

.btn-danger:hover {
    background: var(--error-bg);
}

/* ============================================
   File List
   ============================================ */
.file-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.file-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
    animation: fadeInUp 0.3s ease;
}

.file-item:hover {
    border-color: var(--border-color-hover);
    background: var(--bg-card-hover);
}

.file-item-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.15), rgba(34, 197, 94, 0.05));
    color: var(--success);
    flex-shrink: 0;
}

.file-item-info {
    flex: 1;
    min-width: 0;
}

.file-item-name {
    font-weight: 500;
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-item-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    gap: var(--space-md);
}

.file-item-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--info-bg);
    color: var(--info);
}

.file-item-actions {
    display: flex;
    gap: var(--space-xs);
}

/* ============================================
   Tabs
   ============================================ */
.tabs {
    display: flex;
    gap: var(--space-xs);
    padding: var(--space-xs);
    background: var(--bg-card);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    border: 1px solid var(--border-color);
}

.tab {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 10px 18px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-family);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-normal);
    flex: 1;
    justify-content: center;
}

.tab:hover {
    color: var(--text-primary);
    background: var(--bg-glass);
}

.tab.active {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    box-shadow: 0 2px 10px var(--accent-glow);
}

.tab-content {
    animation: fadeInUp 0.3s ease;
}

/* ============================================
   Data Table
   ============================================ */
.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    max-height: 500px;
    overflow-y: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    white-space: nowrap;
}

.data-table thead {
    position: sticky;
    top: 0;
    z-index: 10;
}

.data-table th {
    padding: 12px 16px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-weight: 600;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.data-table td {
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-fast);
}

.data-table tbody tr:hover td {
    background: var(--bg-glass-hover);
}

.data-table .invoice-header-row td {
    background: rgba(99, 102, 241, 0.05);
    border-top: 2px solid var(--accent-primary);
    font-weight: 500;
}

.data-table .amount-cell {
    text-align: right;
    font-variant-numeric: tabular-nums;
    font-family: 'Inter', monospace;
}

.data-table .invoice-num {
    color: var(--accent-tertiary);
    font-weight: 600;
}

.data-table .payment-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
}

.payment-badge.cash {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
}

.payment-badge.transfer {
    background: rgba(59, 130, 246, 0.1);
    color: #3b82f6;
}

.payment-badge.mixed {
    background: rgba(245, 158, 11, 0.1);
    color: #f59e0b;
}

.payment-badge.card {
    background: rgba(168, 85, 247, 0.1);
    color: #a855f7;
}

/* Sapo table specific */
.sapo-table th {
    font-size: 0.7rem;
}

.sapo-table .header-row-1 th {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(139, 92, 246, 0.1));
    color: var(--accent-tertiary);
    text-align: center;
    font-size: 0.75rem;
}

.sapo-table .header-row-2 th {
    background: var(--bg-secondary);
    font-size: 0.7rem;
}

.sapo-table .header-row-3 th {
    background: rgba(20, 20, 40, 0.8);
    font-size: 0.65rem;
    color: var(--text-muted);
}

/* ============================================
   Preview Stats
   ============================================ */
.preview-stats {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.stat-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: var(--radius-full);
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.stat-badge strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* ============================================
   Export Panel
   ============================================ */
.export-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-3xl) var(--space-xl);
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(20px);
    text-align: center;
}

.export-summary {
    margin-bottom: var(--space-xl);
}

.export-icon {
    color: var(--success);
    margin-bottom: var(--space-lg);
    animation: exportPulse 2s ease-in-out infinite;
}

@keyframes exportPulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.8; }
}

.export-summary h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--success), #4ade80);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.export-details {
    display: flex;
    gap: var(--space-lg);
    justify-content: center;
    flex-wrap: wrap;
}

.export-detail {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.export-detail-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
}

.export-detail-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.export-actions {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
    justify-content: center;
}

/* ============================================
   Modal
   ============================================ */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 600px;
    max-height: 85vh;
    overflow-y: auto;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease;
}

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

@keyframes modalSlideIn {
    from { opacity: 0; transform: translateY(20px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

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

.modal-header h2 {
    font-size: 1.2rem;
    font-weight: 600;
}

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

.help-item {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.help-step {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    font-weight: 700;
    flex-shrink: 0;
}

.help-item h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.help-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.help-note {
    padding: var(--space-lg);
    background: var(--bg-glass);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    margin-top: var(--space-lg);
}

.help-note ul {
    margin-top: var(--space-sm);
    padding-left: var(--space-lg);
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.help-note li strong {
    color: var(--text-primary);
}

/* ============================================
   Toast
   ============================================ */
.toast {
    position: fixed;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 12px 24px;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    font-size: 0.9rem;
    z-index: 2000;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    animation: toastIn 0.3s ease forwards;
}

.toast.toast-out {
    animation: toastOut 0.3s ease forwards;
}

.toast.success {
    border-color: var(--success);
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.1), var(--bg-secondary));
}

.toast.error {
    border-color: var(--error);
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), var(--bg-secondary));
}

.toast.info {
    border-color: var(--info);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), var(--bg-secondary));
}

@keyframes toastIn {
    from { transform: translateX(-50%) translateY(100px); opacity: 0; }
    to { transform: translateX(-50%) translateY(0); opacity: 1; }
}

@keyframes toastOut {
    from { transform: translateX(-50%) translateY(0); opacity: 1; }
    to { transform: translateX(-50%) translateY(100px); opacity: 0; }
}

/* ============================================
   Scrollbar
   ============================================ */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color-hover);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .app-container {
        padding: var(--space-md);
    }
    
    .app-header {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }
    
    .logo-section {
        flex-direction: column;
    }
    
    .steps-indicator {
        flex-wrap: wrap;
        gap: var(--space-sm);
    }
    
    .step-line {
        display: none;
    }
    
    .upload-area {
        padding: var(--space-xl) var(--space-md);
    }
    
    .export-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .export-actions .btn {
        width: 100%;
        justify-content: center;
    }
    
    .tabs {
        flex-direction: column;
    }
}