:root {
    --instagram-gradient: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
    --instagram-gradient-light: linear-gradient(45deg, #f8b267 0%, #f08b6c 25%, #e6683c 50%, #dc2743 75%, #cc2366 100%);
    --text-color: #262626;
    --bg-color: #ffffff;
    --card-bg: #fafafa;
    --border-color: #dbdbdb;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --instagram-gradient: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
    --instagram-gradient-light: linear-gradient(45deg, #f8b267 0%, #f08b6c 25%, #e6683c 50%, #dc2743 75%, #cc2366 100%);
    --text-color: #f5f5f5;
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --border-color: #363636;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    padding: 2rem;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeIn 1s ease-out;
}

.title {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--instagram-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-color);
    opacity: 0.8;
}

.input-section {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px var(--shadow-color);
    margin-bottom: 2rem;
    animation: slideUp 0.5s ease-out;
}

textarea {
    width: 100%;
    min-height: 120px;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
    resize: vertical;
    margin-bottom: 1rem;
    transition: border-color 0.3s;
}

textarea:focus {
    outline: none;
    border-color: #dc2743;
}

.tone-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.tone-option {
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.tone-option:hover {
    transform: translateY(-2px);
    border-color: #dc2743;
}

.tone-option.selected {
    background: var(--instagram-gradient);
    color: white;
    border-color: transparent;
}

.primary-btn {
    background: var(--instagram-gradient);
    color: white;
    width: 100%;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(220, 39, 67, 0.3);
}

.result-section {
    display: none;
    animation: fadeIn 0.5s ease-out;
}

.caption-container {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px var(--shadow-color);
}

.caption-content {
    margin-bottom: 1.5rem;
    line-height: 1.6;
    white-space: pre-line;
}

.caption-content p {
    font-size: 1rem;
    margin: 0;
    padding: 1.5rem;
    background: var(--card-bg);
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

.tags, .hashtags, .mentions {
    display: none;
}

.caption-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 1rem;
}

.copy-btn, .regenerate-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.copy-btn {
    background: var(--card-bg);
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

.copy-btn:hover {
    transform: translateY(-2px);
    border-color: #dc2743;
}

.regenerate-btn {
    background: var(--instagram-gradient);
    color: white;
}

.regenerate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(220, 39, 67, 0.3);
}

.theme-toggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    cursor: pointer;
    padding: 0.75rem;
    border-radius: 50%;
    background: var(--card-bg);
    box-shadow: 0 2px 4px var(--shadow-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

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

footer {
    text-align: center;
    margin-top: 3rem;
    padding: 1rem;
    opacity: 0.7;
}

footer a {
    background: var(--instagram-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
    font-weight: 600;
}

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

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

@media (max-width: 768px) {
    body {
        padding: 1rem;
    }
    
    .title {
        font-size: 2rem;
    }
    
    .input-section, .caption-container {
        padding: 1.5rem;
    }
    
    .tone-selector {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .caption-actions {
        flex-direction: column;
    }
    
    .copy-btn, .regenerate-btn {
        width: 100%;
        justify-content: center;
    }
}

.ad-container {
    margin: 2rem 0;
    padding: 1rem;
    background: var(--card-bg);
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px var(--shadow-color);
    text-align: center;
    min-height: 100px;
    width: 100%;
    overflow: hidden;
}

.ad-container:first-of-type {
    max-width: 300px;
    margin: 2rem auto;
}

.ad-container:last-of-type {
    max-width: 100%;
    margin: 2rem 0;
}

@media (max-width: 768px) {
    .ad-container {
        margin: 1.5rem 0;
        padding: 0.5rem;
        min-height: 50px;
    }
    
    .ad-container:first-of-type {
        max-width: 250px;
    }
}