/* ============================================
   Archäologische Fundverwaltung - CSS
   Mobile-First, Responsive Design
   ============================================ */

:root {
    --primary-color: #2c5f7d;
    --primary-dark: #1e4158;
    --secondary-color: #8b6f47;
    --accent-color: #d4a574;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    
    --bg-color: #f5f5f5;
    --card-bg: #ffffff;
    --text-primary: #333333;
    --text-secondary: #666666;
    --border-color: #ddd;
    
    --header-height: 60px;
    --nav-width: 250px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    --border-radius: 8px;
    --box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Screen Management */
.screen {
    display: none;
    min-height: 100vh;
}

.screen.active {
    display: block;
}

/* ============================================
   LOGIN & REGISTRATION SCREENS
   ============================================ */

.login-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

.login-header {
    text-align: center;
    color: white;
    margin-bottom: var(--spacing-xl);
}

.login-header i {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.9;
}

.login-header h1 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.login-header p {
    font-size: 1rem;
    opacity: 0.9;
}

.login-form-container {
    background: var(--card-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 450px;
}

.login-form-container h2 {
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
    text-align: center;
}

.login-info {
    text-align: center;
    margin-top: var(--spacing-lg);
}

.login-info a {
    color: var(--primary-color);
    text-decoration: none;
}

.login-info a:hover {
    text-decoration: underline;
}

/* ============================================
   APP LAYOUT
   ============================================ */

#appScreen {
    display: grid;
    grid-template-rows: var(--header-height) 1fr;
    grid-template-columns: 1fr;
    height: 100vh;
    overflow: hidden;
}

#appScreen:not(.active) {
    pointer-events: none;
    visibility: hidden;
}

/* Header */
.app-header {
    grid-row: 1;
    grid-column: 1;
    background: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
    box-shadow: var(--box-shadow);
    z-index: 100;
}

.header-left, .header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.app-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.2rem;
}

.desktop-only {
    display: none;
}

.user-info {
    font-size: 0.9rem;
    display: none;
}

.btn-icon {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.btn-icon:hover {
    background: rgba(255,255,255,0.1);
}

/* Side Navigation */
.side-nav {
    position: fixed;
    top: var(--header-height);
    left: -100%;
    width: 280px;
    height: calc(100vh - var(--header-height));
    background: var(--card-bg);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    z-index: 99;
    overflow-y: auto;
}

.side-nav.open {
    left: 0;
}

.nav-menu {
    list-style: none;
    padding: var(--spacing-md) 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.nav-link:hover {
    background: var(--bg-color);
    border-left-color: var(--primary-color);
}

.nav-link.active {
    background: var(--bg-color);
    border-left-color: var(--primary-color);
    color: var(--primary-color);
    font-weight: 600;
}

.nav-link i {
    font-size: 1.2rem;
    width: 24px;
    text-align: center;
}

/* Main Content */
.main-content {
    grid-row: 2;
    grid-column: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* Views */
.view {
    display: none;
    animation: fadeIn 0.3s ease;
}

.view.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

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

.view-header h2 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    color: var(--primary-color);
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    font-weight: 500;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

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

.btn-secondary:hover {
    background: #6d563a;
}

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

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

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

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
    width: 100%;
    justify-content: center;
}

.mt-1 {
    margin-top: 0.5rem;
}

/* ============================================
   FORMS
   ============================================ */

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

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(44, 95, 125, 0.1);
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.form-section {
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: var(--spacing-lg);
}

.form-section h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--border-color);
}

/* ============================================
   DASHBOARD
   ============================================ */

.dashboard-stats {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.stat-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    opacity: 0.8;
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.dashboard-actions {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.recent-finds h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

/* ============================================
   FINDS LIST
   ============================================ */

.search-filter-bar {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box i {
    position: absolute;
    left: var(--spacing-md);
    color: var(--text-secondary);
}

.search-box input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
}

.filter-group select {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
}

.finds-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.find-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
}

.find-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.find-card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: var(--bg-color);
}

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

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

.find-number {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.find-status {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}

.status-im-lager {
    background: #d4edda;
    color: #155724;
}

.status-im-labor {
    background: #fff3cd;
    color: #856404;
}

.status-unterwegs {
    background: #cce5ff;
    color: #004085;
}

.find-title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.find-meta {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ============================================
   SCANNER
   ============================================ */

.scanner-container {
    max-width: 600px;
    margin: 0 auto;
}

.scanner-video {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: var(--spacing-lg);
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.scanner-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.scan-result {
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* ============================================
   IMAGE UPLOAD
   ============================================ */

.image-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: var(--bg-color);
}

.image-upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(44, 95, 125, 0.05);
}

.image-upload-area i {
    font-size: 3rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.image-preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.image-preview-item {
    position: relative;
    aspect-ratio: 1;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.image-preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.image-remove-btn {
    position: absolute;
    top: var(--spacing-xs);
    right: var(--spacing-xs);
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 28px;
    height: 28px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.image-category-badge {
    position: absolute;
    bottom: var(--spacing-xs);
    left: var(--spacing-xs);
    background: rgba(0,0,0,0.7);
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.7rem;
}

/* ============================================
   MODAL
   ============================================ */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-md);
}

.modal {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
}

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

.modal-header h3 {
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

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

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

/* ============================================
   UTILITIES
   ============================================ */

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

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

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

.mt-1 { margin-top: var(--spacing-md); }
.mb-1 { margin-bottom: var(--spacing-md); }
.mt-2 { margin-top: var(--spacing-lg); }
.mb-2 { margin-bottom: var(--spacing-lg); }

.hidden {
    display: none !important;
}

/* Alert Messages */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* Loading Spinner */
.spinner {
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: var(--spacing-xl) auto;
}

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

/* ============================================
   RESPONSIVE DESIGN - TABLET
   ============================================ */

@media (min-width: 768px) {
    .desktop-only {
        display: inline;
    }
    
    .user-info {
        display: block;
    }
    
    .form-row {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .dashboard-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .dashboard-actions {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .finds-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .search-filter-bar {
        flex-direction: row;
    }
    
    .filter-group {
        min-width: 200px;
    }
}

/* ============================================
   RESPONSIVE DESIGN - DESKTOP
   ============================================ */

@media (min-width: 1024px) {
    #appScreen {
        grid-template-columns: var(--nav-width) 1fr;
    }
    
    .app-header {
        grid-column: 1 / -1;
    }
    
    .side-nav {
        position: static;
        left: 0;
        grid-column: 1;
        grid-row: 2;
        height: calc(100vh - var(--header-height));
    }
    
    .main-content {
        grid-column: 2;
        grid-row: 2;
    }
    
    #menuToggle {
        display: none;
    }
    
    .dashboard-stats {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .finds-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .btn-large {
        width: auto;
    }
}

@media (min-width: 1400px) {
    .finds-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Table Action Buttons */
.table-action-btn {
    background: none;
    border: none;
    color: var(--primary-color);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.table-action-btn:hover {
    background: rgba(44, 95, 125, 0.1);
    color: var(--secondary-color);
}

.table-action-btn.delete {
    color: var(--danger-color);
}

.table-action-btn.delete:hover {
    background: rgba(220, 53, 69, 0.1);
    color: #a71d2a;
}

.table-action-btn i {
    pointer-events: none;
}