:root {
    --bg-color: oklch(20% 0.01 234);
    --text-color: oklch(95% 0.01 234);
    --accent-color: oklch(65% 0.2 145);
    --shadow-color: oklch(30% 0.2 145 / 50%);
    --card-bg: oklch(25% 0.01 234);
    --border-color: oklch(35% 0.01 234);
}

[data-theme="light"] {
    --bg-color: oklch(95% 0.01 234);
    --text-color: oklch(20% 0.01 234);
    --accent-color: oklch(55% 0.2 145);
    --shadow-color: oklch(50% 0.2 145 / 30%);
    --card-bg: oklch(100% 0 0);
    --border-color: oklch(85% 0.01 234);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: grid;
    place-content: center;
    min-height: 100vh;
    padding: 2rem;
    background-image: linear-gradient(rgba(128,128,128,0.1) 1px, transparent 1px), linear-gradient(90deg, rgba(128,128,128,0.1) 1px, transparent 1px);
    background-size: 20px 20px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

main {
    text-align: center;
    max-width: 600px;
    width: 100%;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--accent-color), oklch(65% 0.2 200));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-color);
    opacity: 0.7;
    margin-bottom: 2rem;
}

.api-key-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

#api-key {
    padding: 0.8rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--card-bg);
    color: var(--text-color);
    transition: border-color 0.3s ease;
}

#api-key:focus {
    outline: none;
    border-color: var(--accent-color);
}

.api-link {
    color: var(--accent-color);
    font-size: 0.9rem;
    text-decoration: none;
}

.api-link:hover {
    text-decoration: underline;
}

.upload-area {
    border: 3px dashed var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: var(--card-bg);
    position: relative;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-area:hover {
    border-color: var(--accent-color);
    background-color: var(--border-color);
}

.upload-area.dragover {
    border-color: var(--accent-color);
    background-color: var(--border-color);
    transform: scale(1.02);
}

.upload-area.has-image {
    padding: 1rem;
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

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

.upload-area.has-image .upload-content {
    display: none;
}

.preview-image {
    display: none;
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
    object-fit: contain;
}

.upload-area.has-image .preview-image {
    display: block;
}

#analyze-btn {
    padding: 1rem 2rem;
    font-size: 1.2rem;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    box-shadow: 0 4px 15px var(--shadow-color);
    transition: all 0.3s ease;
    width: 100%;
    font-weight: bold;
}

#analyze-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--shadow-color);
}

#analyze-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.result-section {
    display: none;
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: var(--card-bg);
    border-radius: 16px;
    border: 2px solid var(--border-color);
    text-align: left;
}

.result-section.visible {
    display: block;
    animation: fadeIn 0.5s ease;
}

.result-section h2 {
    margin-bottom: 1rem;
    color: var(--accent-color);
    text-align: center;
}

#result-content {
    line-height: 1.8;
}

.food-item {
    padding: 1rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--border-color), transparent);
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.food-name {
    font-weight: bold;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.food-details {
    font-size: 0.95rem;
    opacity: 0.9;
}

.total-calories {
    margin-top: 1rem;
    padding: 1rem;
    background-color: var(--accent-color);
    color: white;
    border-radius: 8px;
    text-align: center;
    font-size: 1.3rem;
    font-weight: bold;
}

.loading {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin-top: 2rem;
}

.loading.visible {
    display: flex;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

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

#theme-toggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    padding: 0.5rem 1rem;
    font-size: 1.5rem;
    background-color: var(--accent-color);
    color: var(--text-color);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 2px 10px var(--shadow-color);
    transition: all 0.3s ease;
}

#theme-toggle:hover {
    transform: scale(1.1);
}

.error-message {
    color: oklch(65% 0.25 25);
    padding: 1rem;
    background-color: oklch(65% 0.1 25 / 20%);
    border-radius: 8px;
    margin-top: 1rem;
}

@media (max-width: 600px) {
    h1 {
        font-size: 1.8rem;
    }

    .upload-area {
        padding: 1.5rem;
        min-height: 150px;
    }

    #analyze-btn {
        font-size: 1rem;
        padding: 0.8rem 1.5rem;
    }
}