:root {
    --primary-color: #FF6B6B;
    --secondary-color: #4ECDC4;
    --accent-color: #FFE66D;
    --dark-color: #2D3436;
    --light-color: #F8F9FA;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 8px 12px rgba(0, 0, 0, 0.15);
    --radius: 12px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans JP', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--dark-color);
    line-height: 1.6;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    padding: 40px 0;
    color: white;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.emoji {
    font-size: 3rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 20px;
}

/* Language Selector */
.language-selector {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}

.lang-btn {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid transparent;
    color: white;
    padding: 8px 20px;
    border-radius: 25px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.lang-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

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

/* Main Content */
main {
    background: white;
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: var(--shadow);
}

/* Upload Section */
.upload-section {
    margin-bottom: 40px;
}

.upload-area {
    border: 3px dashed var(--secondary-color);
    border-radius: var(--radius);
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    background: var(--light-color);
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary-color);
    background: #FFF5F5;
    transform: scale(1.02);
}

.upload-content {
    position: relative;
    z-index: 1;
}

.upload-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: 20px;
}

.upload-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 15px;
}

.upload-btn:hover {
    background: #FF5252;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

/* Results Section */
.results-section {
    animation: fadeIn 0.5s ease;
}

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

.results-section h2 {
    color: var(--primary-color);
    margin-bottom: 25px;
    font-size: 1.8rem;
}

.results-section h3 {
    color: var(--dark-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

/* Detected Foods */
.detected-foods {
    background: var(--light-color);
    padding: 25px;
    border-radius: var(--radius);
    margin-bottom: 30px;
}

.foods-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.food-item {
    background: white;
    padding: 20px;
    border-radius: var(--radius);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

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

.food-info h4 {
    color: var(--dark-color);
    margin-bottom: 5px;
}

.food-details {
    font-size: 0.9rem;
    color: #6C757D;
}

.food-calories {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-color);
}

/* Nutrition Info */
.nutrition-info {
    background: linear-gradient(135deg, #F5F7FA 0%, #C3CFE2 100%);
    padding: 30px;
    border-radius: var(--radius);
    margin-bottom: 30px;
}

.nutrition-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.nutrition-item {
    background: white;
    padding: 20px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    gap: 15px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.nutrition-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.nutrition-icon {
    font-size: 2rem;
}

.nutrition-label {
    font-size: 0.9rem;
    color: #6C757D;
    margin-bottom: 5px;
}

.nutrition-value {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--dark-color);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.save-btn, .reset-btn {
    padding: 12px 30px;
    border: none;
    border-radius: 25px;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

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

.save-btn:hover {
    background: #45B7AA;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.reset-btn {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

/* History Section */
.history-section {
    margin-top: 40px;
    padding-top: 40px;
    border-top: 2px solid var(--light-color);
}

.history-section h2 {
    color: var(--primary-color);
    margin-bottom: 25px;
    font-size: 1.8rem;
}

.history-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 20px;
}

.history-item {
    background: var(--light-color);
    border-radius: var(--radius);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.history-item:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-hover);
}

.history-image {
    width: 100%;
    height: 120px;
    object-fit: cover;
}

.history-info {
    padding: 15px;
    text-align: center;
}

.history-date {
    font-size: 0.85rem;
    color: #6C757D;
    margin-bottom: 5px;
}

.history-calories {
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--primary-color);
}

.no-history {
    text-align: center;
    color: #6C757D;
    padding: 40px;
    font-style: italic;
}

/* Footer */
footer {
    text-align: center;
    padding: 40px 0;
    color: white;
    font-size: 0.9rem;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    color: white;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

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

/* Notification */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--secondary-color);
    color: white;
    padding: 15px 25px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-hover);
    transform: translateX(400px);
    transition: var(--transition);
    z-index: 1000;
}

.notification.show {
    transform: translateX(0);
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-container {
        padding: 10px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .emoji {
        font-size: 2.5rem;
    }
    
    main {
        padding: 20px;
    }
    
    .upload-area {
        padding: 40px 20px;
    }
    
    .nutrition-grid {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .save-btn, .reset-btn {
        width: 100%;
    }
    
    .history-list {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}