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

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #edf5ff;
    --text-primary: #d4d4d4;
    --text-secondary: #9cdcfe;
    --accent-primary: #0f4ba5;
    --accent-hover: #005a9e;
    --accent-success: #4ec9b0;
    --accent-error: #f48771;
    --border-color: #e2e8f0;
    --button-bg: #0e639c;
    --button-hover: #1177bb;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

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

header h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

header .subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

main {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 10px;
}

.section-header label {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.section-header .actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.input-section,
.output-section {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    padding: 24px;
    border: 1px solid var(--border-color);
}

textarea {
    width: 100%;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 16px;
    color: var(--text-primary);
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    resize: vertical;
    min-height: 160px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(0, 122, 204, 0.2);
}

textarea::placeholder {
    color: #6e6e6e;
}

.format-select {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 10px 16px;
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: border-color 0.2s;
}

.format-select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

button {
    border: none;
    border-radius: 6px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-primary {
    background-color: var(--button-bg);
    color: white;
}

.btn-primary:hover {
    background-color: var(--button-hover);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--border-color);
}

.btn-copy {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
}

.btn-copy:hover:not(:disabled) {
    background-color: var(--border-color);
}

.btn-copy:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.examples-section {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    padding: 0 4px;
}

.examples-label {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.example-btn {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 6px 14px;
    font-size: 13px;
    border-radius: 20px;
}

.example-btn:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.code-container {
    background-color: var(--bg-tertiary);
    border-radius: 6px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.code-container pre {
    margin: 0;
    padding: 20px;
    overflow-x: auto;
}

.code-container code {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.5;
}

.validation-message {
    margin-top: 10px;
    padding: 10px 16px;
    border-radius: 6px;
    font-size: 14px;
    display: none;
}

.validation-message.error {
    display: block;
    background-color: rgba(244, 135, 113, 0.1);
    border: 1px solid var(--accent-error);
    color: var(--accent-error);
}

.validation-message.success {
    display: block;
    background-color: rgba(78, 201, 176, 0.1);
    border: 1px solid var(--accent-success);
    color: var(--accent-success);
}

.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--accent-success);
    color: var(--bg-primary);
    padding: 14px 28px;
    border-radius: 8px;
    font-weight: 500;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

footer p {
    color: #6e6e6e;
    font-size: 14px;
}

@media (max-width: 768px) {
    .container {
        padding: 20px 16px;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .section-header .actions {
        width: 100%;
    }
    
    .section-header .actions button,
    .section-header .actions select {
        flex: 1;
    }
    
    .examples-section {
        justify-content: center;
    }
    
    .code-container pre {
        padding: 16px;
    }
    
    .code-container code {
        font-size: 12px;
    }
}

.hljs {
    background: transparent !important;
}