/* ================================
   MODERN DESIGN SYSTEM - NEXTDOOR ABRECHNUNG
   ================================ */

/* CSS Custom Properties (Design Tokens) */
:root {
    /* Colors */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-900: #1e3a8a;
    
    --secondary-500: #8b5cf6;
    --secondary-600: #7c3aed;
    
    --success-50: #f0fdf4;
    --success-500: #22c55e;
    --success-600: #16a34a;
    
    --warning-50: #fffbeb;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
    
    --error-50: #fef2f2;
    --error-500: #ef4444;
    --error-600: #dc2626;
    
    --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;
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, Inconsolata, 'Roboto Mono', monospace;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    
    /* Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --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 -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Base Styles */
html {
    font-size: 16px;
    line-height: 1.5;
}

body {
    font-family: var(--font-sans);
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--secondary-500) 100%);
    min-height: 100vh;
    color: var(--gray-900);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ================================
   COMPONENT SYSTEM
   ================================ */

/* Camera Styles */
#cameraSection {
    position: relative;
    background: var(--gray-900);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin: var(--space-4) 0;
}

.camera-container {
    position: relative;
    width: 100%;
    background: var(--gray-800);
    overflow: hidden;
}

#camera {
    width: 100%;
    max-width: 100%;
    height: auto;
    display: block;
    background: var(--gray-800);
}

.camera-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

.camera-frame {
    width: 80%;
    height: 60%;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-md);
    box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.3);
}

#canvas {
    width: 100%;
    max-width: 100%;
    height: auto;
    display: block;
}

.camera-controls {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-4);
    background: var(--gray-800);
    justify-content: center;
    flex-wrap: wrap;
}

.camera-controls button {
    padding: var(--space-3) var(--space-6);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 0.9rem;
    min-width: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
}

.camera-btn {
    position: relative;
    overflow: hidden;
}

.camera-btn:active {
    transform: scale(0.95);
}

.btn-icon {
    font-size: 1.2rem;
}

.btn-text {
    font-weight: 600;
}

#captureBtn {
    background: var(--success-500);
    color: white;
}

#captureBtn:hover {
    background: var(--success-600);
    transform: translateY(-1px);
}

#stopCameraBtn {
    background: var(--error-500);
    color: white;
}

#stopCameraBtn:hover {
    background: var(--error-600);
    transform: translateY(-1px);
}

#photoPreview {
    padding: var(--space-4);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    margin-top: var(--space-4);
}

#photoPreview img {
    width: 100%;
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

/* File Count Display */
.file-count-display {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: var(--primary-50);
    border: 1px solid var(--primary-200);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-4);
    font-weight: 600;
    color: var(--primary-700);
    transition: all var(--transition-fast);
}

.file-count-display.show {
    display: flex;
}

.file-count-icon {
    font-size: 1.2rem;
}

.file-count-text {
    font-size: 0.9rem;
}

/* File Preview Styles */
#filePreview {
    padding: var(--space-4);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    margin-top: var(--space-4);
    overflow-x: auto;
    overflow-y: hidden;
    white-space: nowrap;
    scrollbar-width: none; /* Hide scrollbar for Firefox */
    -ms-overflow-style: none; /* Hide scrollbar for IE/Edge */
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    position: relative;
    cursor: grab;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    /* Verbesserte Scroll-Performance */
    -webkit-overflow-scrolling: touch;
    scroll-snap-stop: always;
}

#filePreview:active {
    cursor: grabbing;
}

#filePreview::-webkit-scrollbar {
    display: none; /* Hide scrollbar for Chrome/Safari */
}

#filePreview::-webkit-scrollbar {
    display: none; /* Hide scrollbar for Chrome/Safari */
}

#filePreview .preview-item {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3);
    background: white;
    border-radius: var(--radius-md);
    margin-right: var(--space-3);
    box-shadow: var(--shadow-sm);
    min-width: 200px;
    max-width: 250px;
    position: relative;
    white-space: normal;
    scroll-snap-align: center;
    transition: transform var(--transition-fast);
}

#filePreview .preview-item:last-child {
    margin-right: 0;
}

#filePreview .preview-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

#filePreview .preview-item.active {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--primary-500);
}

#filePreview .preview-item:last-child {
    margin-right: 0;
}

#filePreview .preview-item img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    border: 1px solid var(--gray-200);
}

#filePreview .preview-item .file-name {
    font-size: 0.75rem;
    color: var(--gray-600);
    text-align: center;
    word-break: break-word;
    line-height: 1.2;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

#filePreview .preview-item .remove-btn {
    position: absolute;
    top: var(--space-2);
    right: var(--space-2);
    background: var(--error-500);
    color: white;
    border: none;
    border-radius: 50%;
    width: 28px;
    height: 28px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

#filePreview .preview-item .remove-btn:hover {
    background: var(--error-600);
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

/* Flash Controls */
.flash-controls {
    display: flex;
    gap: var(--space-3);
    justify-content: center;
    margin-top: var(--space-3);
    padding: var(--space-3);
    background: var(--gray-50);
    border-radius: var(--radius-md);
}

.flash-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-3) var(--space-4);
    background: var(--gray-100);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    color: var(--gray-600);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 80px;
}

.flash-btn:hover {
    background: var(--gray-200);
    color: var(--gray-700);
    transform: translateY(-1px);
}

.flash-btn.active {
    background: var(--primary-500);
    color: white;
    border-color: var(--primary-600);
    box-shadow: var(--shadow-sm);
}

.flash-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.flash-btn .btn-icon {
    font-size: 1.2rem;
}

.flash-btn .btn-text {
    font-size: 0.8rem;
    text-align: center;
}

/* Mobile Camera Optimization */
@media (max-width: 768px) {
    #cameraSection {
        margin: var(--space-2) 0;
        border-radius: var(--radius-md);
    }
    
    .camera-container {
        border-radius: var(--radius-md);
    }
    
    #camera {
        max-height: 60vh; /* Begrenze Höhe auf mobilen Geräten */
        object-fit: cover; /* Behält Seitenverhältnis bei */
    }
    
    #canvas {
        max-height: 60vh;
        object-fit: cover;
    }
    
    .camera-frame {
        width: 85%;
        height: 65%;
        border-width: 3px;
    }
    
    .camera-controls {
        padding: var(--space-3);
        gap: var(--space-2);
    }
    
    .camera-controls button {
        padding: var(--space-4) var(--space-5);
        font-size: 1rem;
        min-width: 140px;
        flex: 1;
        max-width: 200px;
    }
    
    .flash-controls {
        padding: var(--space-2);
        gap: var(--space-2);
    }
    
    .flash-btn {
        padding: var(--space-2) var(--space-3);
        min-width: 70px;
        font-size: 0.8rem;
    }
    
    .flash-btn .btn-icon {
        font-size: 1rem;
    }
    
    .flash-btn .btn-text {
        font-size: 0.7rem;
    }
    
    .btn-icon {
        font-size: 1.4rem;
    }
    
    .btn-text {
        font-size: 0.9rem;
    }
    
    #photoPreview {
        padding: var(--space-3);
        margin-top: var(--space-3);
    }
    
    #photoPreview img {
        max-height: 50vh; /* Begrenze Vorschau-Höhe */
        object-fit: contain;
    }
    
    #filePreview {
        padding: var(--space-3);
        margin-top: var(--space-3);
    }
    
    #filePreview .preview-item {
        padding: var(--space-2);
        gap: var(--space-2);
    }
    
    #filePreview .preview-item img {
        width: 50px;
        height: 50px;
    }
    
    #filePreview .preview-item .remove-btn {
        width: 20px;
        height: 20px;
        font-size: 10px;
    }
}

/* Portrait Mode Optimization */
@media (max-width: 768px) and (orientation: portrait) {
    #camera {
        max-height: 50vh;
    }
    
    #canvas {
        max-height: 50vh;
    }
    
    .camera-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .camera-controls button {
        width: 100%;
        max-width: 300px;
    }
    
    #photoPreview img {
        max-height: 40vh;
    }
    
    #filePreview .preview-item {
        min-width: 140px;
        max-width: 180px;
    }
    
    #filePreview .preview-item img {
        height: 100px;
    }
}

/* Landscape Mode Optimization */
@media (max-width: 768px) and (orientation: landscape) {
    #camera {
        max-height: 70vh;
    }
    
    #canvas {
        max-height: 70vh;
    }
    
    .camera-controls {
        flex-direction: row;
        justify-content: center;
    }
    
    .camera-controls button {
        flex: 0 1 auto;
        min-width: 120px;
    }
    
    #photoPreview img {
        max-height: 35vh;
    }
    
    #filePreview .preview-item img {
        height: 90px;
    }
}

/* Small Screen Optimization */
@media (max-width: 480px) {
    #cameraSection {
        margin: var(--space-1) 0;
    }
    
    #camera {
        max-height: 50vh;
    }
    
    #canvas {
        max-height: 50vh;
    }
    
    .camera-frame {
        width: 90%;
        height: 70%;
        border-width: 2px;
    }
    
    .camera-controls {
        padding: var(--space-2);
        gap: var(--space-1);
    }
    
    .camera-controls button {
        padding: var(--space-3) var(--space-4);
        font-size: 0.9rem;
        min-width: 100px;
    }
    
    .btn-icon {
        font-size: 1.2rem;
    }
    
    .btn-text {
        font-size: 0.8rem;
    }
    
    #photoPreview {
        padding: var(--space-2);
        margin-top: var(--space-2);
    }
    
    #photoPreview img {
        max-height: 30vh;
    }
    
    #filePreview {
        padding: var(--space-2);
        margin-top: var(--space-2);
    }
    
    #filePreview .preview-item {
        padding: var(--space-2);
        gap: var(--space-2);
        min-width: 140px;
        max-width: 180px;
    }
    
    #filePreview .preview-item img {
        height: 80px;
    }
    
    #filePreview .preview-item .remove-btn {
        width: 20px;
        height: 20px;
        font-size: 10px;
    }
}

/* Button System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1.25rem;
    text-decoration: none;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-primary {
    background: var(--primary-500);
    color: white;
    border-color: var(--primary-500);
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-600);
    border-color: var(--primary-600);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-success {
    background: var(--success-500);
    color: white;
    border-color: var(--success-500);
}

.btn-success:hover:not(:disabled) {
    background: var(--success-600);
    border-color: var(--success-600);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-danger {
    background: var(--error-500);
    color: white;
    border-color: var(--error-500);
}

.btn-danger:hover:not(:disabled) {
    background: var(--error-600);
    border-color: var(--error-600);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: 0.75rem;
}

.btn-lg {
    padding: var(--space-4) var(--space-6);
    font-size: 1rem;
}

/* Alert Components */
.alert {
    padding: var(--space-4);
    border-radius: var(--radius-md);
    border: 1px solid;
    margin-bottom: var(--space-4);
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
}

.success-message,
.alert-success {
    background: var(--success-50);
    border-color: var(--success-200);
    color: var(--success-800);
}

.error-message,
.alert-error {
    background: var(--error-50);
    border-color: var(--error-200);
    color: var(--error-800);
}

.alert-info {
    background: var(--primary-50);
    border-color: var(--primary-200);
    color: var(--primary-800);
}

/* Empty State */
.empty-state,
.no-files {
    text-align: center;
    padding: var(--space-16) var(--space-8);
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 2px dashed var(--gray-200);
}

.empty-state h3,
.no-files h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
}

.empty-state p,
.no-files p {
    color: var(--gray-600);
    margin-bottom: var(--space-6);
}

/* Main Layout */
.container,
.files-container,
.password-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-5);
    background: white;
    min-height: calc(100vh - 2rem);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    margin-top: var(--space-4);
    margin-bottom: var(--space-4);
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-6) 0;
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: var(--space-8);
}

header h1 {
    color: var(--primary-600);
    font-size: 2rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

header h1::before {
    content: "📊";
    font-size: 2.5rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    color: var(--gray-600);
    font-weight: 500;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--primary-500);
    text-decoration: none;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.nav-link:hover {
    background: var(--primary-50);
    color: var(--primary-600);
}

.logout-btn {
    background: var(--error-500);
    color: white;
    padding: var(--space-2) var(--space-4);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.logout-btn:hover {
    background: var(--error-600);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.logout-btn::before {
    content: "🚪";
}

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

.form-group label,
.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.875rem;
}

.form-group input,
.form-group select,
.form-input,
.form-select {
    width: 100%;
    padding: var(--space-3);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
    background: white;
}

.form-group input:focus,
.form-group select:focus,
.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px var(--primary-100);
}

/* Legacy button override */
button:not(.btn):not(.method-btn):not(.upload-option-btn) {
    background: var(--primary-500);
    color: white;
    padding: var(--space-3) var(--space-5);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

button:not(.btn):not(.method-btn):not(.upload-option-btn):hover:not(:disabled) {
    background: var(--primary-600);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

button:not(.btn):not(.method-btn):not(.upload-option-btn):disabled {
    background: var(--gray-400);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Upload Section */
.upload-section {
    background: var(--gray-50);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-200);
    margin-bottom: var(--space-8);
}

.upload-section h2 {
    color: var(--gray-900);
    margin-bottom: var(--space-8);
    text-align: center;
    font-weight: 700;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
}

.upload-section h2::before {
    content: "📤";
    font-size: 1.75rem;
}

.upload-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.method-btn {
    background: var(--success-500);
    color: white;
    padding: var(--space-4) var(--space-6);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    min-height: 60px;
}

.method-btn:hover:not(.active) {
    background: var(--success-600);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.method-btn.active {
    background: var(--primary-500);
    box-shadow: var(--shadow-md);
}

.upload-section-content {
    background: white;
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    margin-top: var(--space-6);
}

.upload-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.upload-option-btn {
    background: var(--success-500);
    color: white;
    padding: var(--space-4) var(--space-5);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
}

.upload-option-btn:hover:not(:disabled) {
    background: var(--success-600);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.file-info {
    color: var(--gray-600);
    font-size: 0.875rem;
    margin-bottom: var(--space-5);
    padding: var(--space-3);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
}

/* Login Specific */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: var(--space-5);
}

.login-form {
    background: white;
    padding: var(--space-10);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 400px;
    border: 1px solid var(--gray-100);
}

.login-form h1 {
    color: var(--primary-500);
    text-align: center;
    margin-bottom: var(--space-2);
    font-size: 2rem;
    font-weight: 700;
}

.login-form h2 {
    text-align: center;
    margin-bottom: var(--space-8);
    color: var(--gray-600);
    font-weight: 400;
}

/* File Management */
.filters {
    background: var(--gray-50);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    margin-bottom: var(--space-8);
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
    align-items: end;
}

.filter-group {
    flex: 1;
    min-width: 150px;
}

.filter-actions {
    display: flex;
    gap: var(--space-3);
}

.statistics {
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--secondary-500) 100%);
    color: white;
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-8);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-6);
    text-align: center;
}

.stat-item h3 {
    font-size: 2rem;
    margin-bottom: var(--space-1);
    font-weight: 700;
}

.stat-item p {
    opacity: 0.9;
    font-weight: 500;
}

.folder-structure {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.folder-year {
    border-bottom: 1px solid var(--gray-200);
}

.folder-year:last-child {
    border-bottom: none;
}

.year-header {
    background: var(--primary-500);
    color: white;
    padding: var(--space-4) var(--space-5);
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    transition: background var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.year-header:hover {
    background: var(--primary-600);
}

.year-header::before {
    content: "📅";
}

.year-content {
    display: none;
}

.year-content.expanded {
    display: block;
}

.month-header {
    background: var(--gray-50);
    padding: var(--space-3) var(--space-8);
    font-weight: 600;
    color: var(--gray-700);
    cursor: pointer;
    user-select: none;
    border-bottom: 1px solid var(--gray-200);
    transition: background var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.month-header:hover {
    background: var(--gray-100);
}

.month-header::before {
    content: "📁";
}

.month-content {
    display: none;
}

.month-content.expanded {
    display: block;
}

.category-section {
    padding: var(--space-4) var(--space-12);
    border-bottom: 1px solid var(--gray-100);
}

.category-section:last-child {
    border-bottom: none;
}

.category-header {
    font-weight: 600;
    color: var(--primary-600);
    margin-bottom: var(--space-3);
    padding: var(--space-2) var(--space-3);
    background: var(--primary-50);
    border-radius: var(--radius-md);
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.category-header::before {
    content: "📋";
}

.file-list {
    margin-left: var(--space-5);
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--gray-100);
}

.file-item:last-child {
    border-bottom: none;
}

.file-info {
    display: flex;
    align-items: center;
    flex: 1;
}

.file-icon {
    font-size: 1.5rem;
    margin-right: var(--space-3);
}

.file-details {
    flex: 1;
}

.file-name {
    font-weight: 500;
    color: var(--gray-900);
    margin-bottom: var(--space-1);
}

.file-meta {
    color: var(--gray-600);
    font-size: 0.75rem;
}

.file-actions {
    display: flex;
    gap: var(--space-2);
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.file-item:hover .file-actions {
    opacity: 1;
}

.btn-small {
    padding: var(--space-1) var(--space-2);
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    min-width: 28px;
    height: 28px;
}

.btn-view {
    background: var(--success-500);
    color: white;
}

.btn-view:hover {
    background: var(--success-600);
    transform: scale(1.1);
}

.btn-download {
    background: var(--primary-500);
    color: white;
}

.btn-download:hover {
    background: var(--primary-600);
    transform: scale(1.1);
}

.btn-delete {
    background: var(--error-500);
    color: white;
}

.btn-delete:hover {
    background: var(--error-600);
    transform: scale(1.1);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container,
    .files-container,
    .password-container {
        margin: var(--space-2);
        padding: var(--space-4);
        border-radius: var(--radius-lg);
    }
    
    header {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
    
    .user-info {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .upload-methods {
        grid-template-columns: 1fr;
    }
    
    .filters {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-actions {
        justify-content: center;
    }
    
    .statistics {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .category-section {
        padding-left: var(--space-6);
    }
    
    .file-list {
        margin-left: var(--space-2);
    }
}

/* Touch devices */
@media (hover: none) {
    .btn:hover,
    .method-btn:hover,
    .upload-option-btn:hover {
        transform: none;
    }
    
    .btn:active,
    .method-btn:active,
    .upload-option-btn:active {
        transform: scale(0.98);
    }
}