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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 800px;
    width: 100%;
    padding: 40px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    color: #333;
    font-size: 2em;
    margin-bottom: 10px;
}

.subtitle {
    color: #666;
    font-size: 0.95em;
}

.form-group {
    margin-bottom: 25px;
}

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

input[type="text"],
textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input[type="text"]:focus,
textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

textarea {
    resize: vertical;
    min-height: 200px;
    line-height: 1.6;
}

.hint {
    display: block;
    margin-top: 6px;
    color: #888;
    font-size: 0.85em;
}

.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 8px;
}

.btn-small {
    padding: 6px 12px;
    background: #f0f0f0;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background 0.2s;
}

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

.char-count {
    color: #888;
    font-size: 0.85em;
}

.actions {
    text-align: center;
    margin-top: 30px;
}

.btn-primary {
    padding: 14px 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.result {
    margin-top: 25px;
    padding: 16px;
    border-radius: 8px;
    font-weight: 500;
    text-align: center;
}

.result.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.result.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.result.hidden {
    display: none;
}

.download-wrap {
    margin-top: 10px;
}

.download-link {
    display: inline-block;
    padding: 8px 16px;
    background: #1a5490;
    color: #fff;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
}

.download-link:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 14px rgba(26, 84, 144, 0.3);
}

footer {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
    color: #888;
    font-size: 0.9em;
}

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

    header h1 {
        font-size: 1.5em;
    }

    .btn-primary {
        width: 100%;
    }
}