/**
 * Gewichtverlieren JoPaDa
 * Modern CSS (2025) - Mobile-First, Dark-Mode ready
 */

:root {
    /* Farben */
    --primary: #667eea;
    --primary-dark: #5568d3;
    --secondary: #764ba2;
    --success: #28a745;
    --danger: #dc3545;
    --warning: #ffc107;
    --info: #17a2b8;
    
    /* Grautöne */
    --gray-50: #f8f9fa;
    --gray-100: #e9ecef;
    --gray-200: #dee2e6;
    --gray-300: #ced4da;
    --gray-400: #adb5bd;
    --gray-500: #6c757d;
    --gray-600: #495057;
    --gray-700: #343a40;
    --gray-800: #212529;
    --gray-900: #1a1d20;
    
    /* Text */
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-light: #ffffff;
    
    /* Hintergrund */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-dark: #212529;
    
    /* Schatten */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 20px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.3);
    
    /* Abstände */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border-Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #ffffff;
        --text-secondary: #adb5bd;
        --bg-primary: #1a1d20;
        --bg-secondary: #212529;
        --gray-50: #212529;
        --gray-100: #343a40;
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.hidden {
    display: none !important;
}

/* Overlay */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-md);
    pointer-events: auto;
}

/* Auth Container */
.auth-container {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 450px;
    width: 100%;
    overflow: hidden;
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.auth-tabs {
    display: flex;
    border-bottom: 2px solid var(--gray-200);
}

.tab-btn {
    flex: 1;
    padding: var(--spacing-md);
    background: none;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom: 3px solid var(--primary);
}

.auth-form {
    padding: var(--spacing-2xl);
    display: none;
}

.auth-form.active {
    display: block;
}

.auth-form h2 {
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
}

.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 {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Datum-Input verbessern */
input[type="date"] {
    position: relative;
    font-family: inherit;
    cursor: pointer;
}

input[type="date"]::-webkit-calendar-picker-indicator {
    cursor: pointer;
    opacity: 0.7;
    padding: 5px;
    margin-left: 5px;
}

input[type="date"]::-webkit-calendar-picker-indicator:hover {
    opacity: 1;
}

/* Datum-Input Container für bessere Anzeige */
.date-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.date-input-wrapper input[type="date"] {
    flex: 1;
}

.date-display {
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: var(--spacing-sm);
    background: var(--gray-50);
    border-radius: var(--radius-sm);
    min-width: 120px;
    text-align: center;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    cursor: pointer;
}

/* Buttons */
.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    display: inline-block;
    text-align: center;
    pointer-events: auto !important;
    position: relative;
    z-index: 10;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--text-light);
    width: 100%;
}

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

.btn-large {
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: 1.1rem;
}

.btn-small {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
}

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

.btn-danger:hover {
    background: #c82333;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.error-message {
    color: var(--danger);
    margin-top: var(--spacing-md);
    font-size: 0.9rem;
    display: none;
}

.error-message.show {
    display: block;
}

.message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    display: none;
}

.message.success {
    background: #d4edda;
    color: #155724;
    display: block;
}

.message.error {
    background: #f8d7da;
    color: #721c24;
    display: block;
}

/* Navigation */
.navbar {
    background: var(--bg-primary);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand h1 {
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.nav-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-size: 0.95rem;
}

.nav-btn:hover,
.nav-btn.active {
    background: var(--primary);
    color: var(--text-light);
}

.nav-user {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

.page {
    display: none;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

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

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

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

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    font-size: 3rem;
}

.stat-content h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

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

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

/* Chart Container */
.chart-container {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-2xl);
}

.chart-container canvas {
    max-height: 500px;
    width: 100% !important;
    height: 400px !important;
}

.chart-container h3 {
    margin-bottom: var(--spacing-lg);
}

#weight-chart {
    max-height: 400px;
}

/* Belohnungssystem */
.rewards-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.rewards-section {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.rewards-section h3 {
    margin-bottom: var(--spacing-lg);
    color: var(--primary);
    font-size: 1.2rem;
}

.stars-container,
.hearts-container,
.cubes-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    min-height: 40px;
    align-items: center;
}

.star,
.heart,
.cube {
    font-size: 1.8rem;
    line-height: 1;
    transition: all var(--transition-fast);
    cursor: default;
}

.star.yellow {
    color: #ffc107;
    text-shadow: 0 0 5px rgba(255, 193, 7, 0.5);
}

.star.red {
    color: #dc3545 !important;
    filter: hue-rotate(0deg) saturate(1.5);
    text-shadow: 0 0 8px rgba(220, 53, 69, 0.8);
}

.star.gray {
    color: #adb5bd;
    opacity: 0.5;
}

.heart.green {
    color: #28a745;
    text-shadow: 0 0 5px rgba(40, 167, 69, 0.5);
}

.heart.black {
    color: #212529;
    opacity: 0.6;
}

.cube.white {
    color: #ffffff;
    text-shadow: 0 0 2px rgba(0,0,0,0.2);
    background: linear-gradient(135deg, #f0f0f0 0%, #e0e0e0 100%);
    border-radius: 3px;
    padding: 2px 4px;
}

.cube.gray {
    color: #6c757d;
    opacity: 0.6;
}

.rewards-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--gray-200);
}

/* Admin-Bereich */
.admin-section {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
}

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

.admin-form .form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.admin-form .form-group input {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 1rem;
    margin-top: var(--spacing-sm);
}

.admin-form .form-group small {
    display: block;
    margin-top: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Details Grid */
.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.detail-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.detail-card h3 {
    margin-bottom: var(--spacing-lg);
    color: var(--primary);
}

.detail-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--gray-200);
}

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

/* Entry Form */
.entry-form {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
    max-width: 800px;
    margin: 0 auto;
}

.form-section {
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 2px solid var(--gray-200);
}

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

.form-section h3 {
    margin-bottom: var(--spacing-lg);
    color: var(--primary);
}

.alcohol-details,
.sport-details {
    margin-top: var(--spacing-lg);
    padding-left: var(--spacing-lg);
    border-left: 3px solid var(--primary);
    display: none;
}

.alcohol-details.show,
.sport-details.show {
    display: block;
    animation: slideDown 0.3s ease;
}

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

.calories-display {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    text-align: center;
}

/* Challenge */
.challenge-invite-section {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
}

.invite-form {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-end;
}

.invite-form .form-group {
    flex: 1;
    margin-bottom: 0;
}

.invitation-notice {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.invitation-notice p {
    margin: var(--spacing-sm) 0;
}

.challenge-leaderboard {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.leaderboard-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--gray-200);
}

.leaderboard-header h3 {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
}

.participant-count {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.leaderboard-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    border-left: 4px solid transparent;
    position: relative;
    overflow: hidden;
}

.leaderboard-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--primary);
    transform: scaleY(0);
    transition: transform var(--transition-normal);
}

.leaderboard-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.leaderboard-item:hover::before {
    transform: scaleY(1);
}

/* Ränge mit speziellen Farben */
.leaderboard-item.rank-gold {
    background: linear-gradient(90deg, #fff9e6 0%, #fff 100%);
    border-left-color: #ffd700;
}

.leaderboard-item.rank-silver {
    background: linear-gradient(90deg, #f5f5f5 0%, #fff 100%);
    border-left-color: #c0c0c0;
}

.leaderboard-item.rank-bronze {
    background: linear-gradient(90deg, #ffe4cc 0%, #fff 100%);
    border-left-color: #cd7f32;
}

.leaderboard-item.rank-top10 {
    border-left-color: var(--primary);
}

.leaderboard-rank {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    min-width: 60px;
    text-align: center;
}

.rank-number {
    display: block;
    font-size: 1.8rem;
}

.leaderboard-info {
    flex: 1;
    margin-left: var(--spacing-lg);
}

.leaderboard-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

.stat-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--bg-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
}

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

.stat-label {
    color: var(--text-secondary);
}

.stat-value {
    font-weight: 700;
    color: var(--primary);
}

.badges {
    display: inline-flex;
    gap: var(--spacing-xs);
    margin-left: var(--spacing-sm);
    font-size: 0.85rem;
}

.leaderboard-name {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: var(--gray-200);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-top: var(--spacing-md);
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    transition: width var(--transition-normal);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-text {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    z-index: 1;
}

/* Photos */
.photo-upload-section {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-2xl);
}

.photos-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.photo-item {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast);
}

.photo-item:hover {
    transform: scale(1.05);
}

.photo-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.photo-item-info {
    padding: var(--spacing-md);
}

.photo-item-date {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Loading */
.loading {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .nav-menu {
        width: 100%;
        justify-content: space-between;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .details-grid {
        grid-template-columns: 1fr;
    }
    
    .photos-gallery {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: var(--spacing-md);
    }
}

/* Message Info */
.message.info {
    background: #d1ecf1;
    color: #0c5460;
    display: block;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    text-align: center;
}

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

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }