:root {
    --bg-color: #f0f2f5;
    --container-bg: #fff;
    --text-primary: #333;
    --text-secondary: #666;
    --accent-color: #007bff;
    --accent-hover: #0056b3;
    --shadow: 0 10px 30px rgba(0,0,0,0.1);
}

body.dark-mode {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --accent-color: #bb86fc;
    --accent-hover: #9965f4;
    --shadow: 0 10px 30px rgba(0,0,0,0.5);
}

body {
    font-family: 'Helvetica Neue', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    background: var(--container-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    text-align: center;
    max-width: 500px;
    width: 90%;
    transition: background-color 0.3s, box-shadow 0.3s;
}

h1 {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
}

#themeBtn {
    background: none;
    border: 1px solid var(--text-secondary);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s;
}

#themeBtn:hover {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.upload-container {
    border: 2px dashed #ccc;
    border-radius: 0.5rem;
    padding: 2rem;
    margin-bottom: 2rem;
    cursor: pointer;
    transition: border-color 0.3s;
}

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

#imageUpload {
    display: none;
}

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

.upload-icon {
    font-size: 3rem;
    color: var(--accent-color);
}

.upload-text {
    font-size: 1.2rem;
    color: var(--text-primary);
}

#imagePreview img {
    max-width: 100%;
    border-radius: 0.5rem;
    margin-top: 1rem;
}

.analyze-button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 1rem 2rem;
    font-size: 1.2rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.analyze-button:hover {
    background-color: var(--accent-hover);
    box-shadow: 0 5px 15px rgba(0, 123, 255, 0.4);
}

.result-container {
    margin-top: 2rem;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-primary);
    transition: opacity 0.3s;
}

.city-image {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: 0.5rem;
    margin-top: 1rem;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.soulmate-container {
    margin-top: 2rem;
    border-top: 1px solid rgba(0,0,0,0.1);
    padding-top: 2rem;
}

body.dark-mode .soulmate-container {
    border-top-color: rgba(255,255,255,0.1);
}

.soulmate-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 1rem 0;
}

.soulmate-btn {
    background-color: transparent;
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s;
}

.soulmate-btn:hover {
    background-color: var(--accent-color);
    color: white;
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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