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

:root {
    --bg-primary: #0a0a1a;
    --bg-secondary: #12122a;
    --bg-tertiary: #1a1a3a;
    --text-primary: #ffffff;
    --text-secondary: #b0b0d0;
    --accent-purple: #9b59b6;
    --accent-cyan: #00d4ff;
    --accent-teal: #1abc9c;
    --header-bg: #1a1a3a;
    --border-color: #2a2a4a;
}

[data-theme="light"] {
    --bg-primary: #f0f2f5;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e8eaed;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --header-bg: #2a2a4a;
    --border-color: #d0d0e0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    transition: background 0.3s, color 0.3s;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    background: var(--header-bg);
    padding: 20px 30px;
    border-radius: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.header h1 {
    font-size: 1.8rem;
    color: var(--text-primary);
}

.highlight {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.theme-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 15px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s;
}

.theme-toggle:hover {
    background: var(--accent-purple);
    transform: scale(1.05);
}

.main-content {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 30px;
}

.controls-panel {
    background: var(--bg-secondary);
    padding: 25px;
    border-radius: 15px;
    border: 1px solid var(--border-color);
    max-height: 80vh;
    overflow-y: auto;
}

.controls-panel::-webkit-scrollbar {
    width: 6px;
}

.controls-panel::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 3px;
}

.controls-panel::-webkit-scrollbar-thumb {
    background: var(--accent-purple);
    border-radius: 3px;
}

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

.control-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.control-group select {
    width: 100%;
    padding: 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    outline: none;
    transition: all 0.3s;
}

.control-group select:focus {
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 2px rgba(155, 89, 182, 0.2);
}

.control-group select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.control-section {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.control-section h3 {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 15px;
}

.presets-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.preset-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.3s;
}

.preset-btn:hover {
    background: var(--accent-purple);
    border-color: var(--accent-purple);
    transform: translateY(-2px);
}

.reset-section {
    margin-top: 20px;
}

.reset-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--accent-teal), var(--accent-cyan));
    border: none;
    color: white;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s;
}

.reset-btn:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 15px rgba(26, 188, 156, 0.4);
}

.preview-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.preview-container {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: 15px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 350px;
}

.preview-box {
    width: 100%;
    max-width: 600px;
}

.text-sample {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    padding: 25px;
    border-radius: 10px;
    text-align: left;
}

.code-display {
    background: var(--bg-secondary);
    border-radius: 15px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.code-header {
    background: var(--bg-tertiary);
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.code-header span {
    color: var(--accent-cyan);
    font-weight: 600;
}

.copy-btn {
    background: var(--accent-purple);
    border: none;
    color: white;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.3s;
}

.copy-btn:hover {
    background: var(--accent-cyan);
    color: var(--bg-primary);
}

.code-content {
    padding: 20px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.95rem;
    color: var(--text-primary);
    overflow-x: auto;
    direction: ltr;
    text-align: left;
    margin: 0;
    white-space: pre-wrap;
    word-break: break-all;
}

@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .controls-panel {
        max-height: none;
    }

    .preview-container {
        min-height: 250px;
    }
}