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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    padding: 40px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    color: #333;
    font-size: 2.5em;
    margin-bottom: 10px;
}

header p {
    color: #666;
    font-size: 1.1em;
}

.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid #eee;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 24px;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 1em;
    color: #666;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    color: #667eea;
    border-bottom-color: #667eea;
}

.tab-btn.active {
    color: #667eea;
    border-bottom-color: #667eea;
    font-weight: 600;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

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

.tab-content h2 {
    color: #333;
    margin-bottom: 25px;
    font-size: 1.5em;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    color: #333;
    font-weight: 600;
    margin-bottom: 8px;
}

input[type="text"],
input[type="file"],
input[type="color"],
select {
    width: 100%;
    padding: 12px;
    border: 2px solid #eee;
    border-radius: 5px;
    font-size: 1em;
    transition: border-color 0.3s ease;
}

input[type="text"]:focus,
input[type="file"]:focus,
input[type="color"]:focus,
select:focus {
    outline: none;
    border-color: #667eea;
}

input[type="range"] {
    width: calc(100% - 60px);
    margin-right: 15px;
}

#angleValue {
    color: #667eea;
    font-weight: 600;
    min-width: 50px;
    text-align: right;
}

small {
    display: block;
    color: #999;
    margin-top: 5px;
    font-size: 0.9em;
}

.checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    margin-bottom: 0;
    font-weight: 400;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-right: 8px;
    cursor: pointer;
}

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 5px;
    font-size: 1em;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    margin-top: 10px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #f0f0f0;
    color: #333;
}

.btn-secondary:hover {
    background: #e0e0e0;
}

.emoji-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(50px, 1fr));
    gap: 10px;
    margin-top: 15px;
}

.emoji-btn {
    font-size: 2em;
    padding: 10px;
    border: 2px solid #eee;
    border-radius: 5px;
    cursor: pointer;
    text-align: center;
    transition: all 0.2s ease;
    user-select: none;
}

.emoji-btn:hover {
    border-color: #667eea;
    transform: scale(1.1);
    background: #f5f5f5;
}

.preview-container {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 2px solid #eee;
}

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

.icon-preview {
    text-align: center;
}

.icon-preview canvas {
    border: 1px solid #eee;
    border-radius: 5px;
    max-width: 100%;
    height: auto;
    margin-bottom: 10px;
}

.icon-preview p {
    color: #666;
    font-weight: 600;
    margin-bottom: 8px;
}

.download-btn {
    background: #27ae60;
    color: white;
    padding: 8px 15px;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background 0.3s ease;
}

.download-btn:hover {
    background: #229954;
}

.info-section {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 5px;
    margin-top: 40px;
}

.info-section h3 {
    color: #333;
    margin-bottom: 15px;
}

.info-section ul {
    list-style: none;
}

.info-section li {
    color: #666;
    padding: 8px 0;
    border-bottom: 1px solid #eee;
}

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

.success-msg {
    background: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
    padding: 12px;
    border-radius: 5px;
    margin-bottom: 15px;
}

.error-msg {
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    color: #721c24;
    padding: 12px;
    border-radius: 5px;
    margin-bottom: 15px;
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }

    header h1 {
        font-size: 1.8em;
    }

    .tabs {
        flex-direction: column;
        gap: 0;
        border-bottom: none;
    }

    .tab-btn {
        border-bottom: 2px solid #eee;
        border-right: none;
    }

    .tab-btn.active {
        border-bottom-color: #667eea;
    }

    .preview-grid {
        grid-template-columns: 1fr;
    }
}