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

:root {
    --primary-color: #5e72e4;
    --secondary-color: #2dce89;
    --danger-color: #f5365c;
    --warning-color: #fb6340;
    --info-color: #11cdef;
    --dark: #32325d;
    --light: #f4f5f7;
    --white: #ffffff;
    --gray: #8898aa;
    --border-radius: 8px;
    --shadow: 0 0 20px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

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

header {
    text-align: center;
    padding: 40px 0;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 30px;
    position: relative;
}

h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    font-weight: 700;
}

.subtitle {
    color: var(--gray);
    font-size: 1.1rem;
}

.lang-switcher {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 10px;
}

.lang-btn {
    padding: 8px 16px;
    border: 2px solid var(--primary-color);
    background: var(--white);
    color: var(--primary-color);
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.lang-btn:hover,
.lang-btn.active {
    background: var(--primary-color);
    color: var(--white);
}

main {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow);
}

.builder-section {
    display: grid;
    gap: 30px;
}

.visual-builder {
    background: var(--light);
    padding: 25px;
    border-radius: var(--border-radius);
}

.visual-builder h2 {
    color: var(--dark);
    margin-bottom: 20px;
    font-size: 1.4rem;
}

.pattern-blocks {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 12px;
}

.block-btn {
    padding: 15px 10px;
    background: var(--white);
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.block-btn:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(94, 114, 228, 0.2);
}

.block-icon {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--primary-color);
    font-family: 'Courier New', monospace;
}

.block-label {
    font-size: 0.85rem;
    color: var(--gray);
}

.regex-input-section {
    background: var(--light);
    padding: 25px;
    border-radius: var(--border-radius);
}

.regex-input-section label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--dark);
}

.input-with-actions {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

#regex-input {
    flex: 1;
    padding: 12px;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-family: 'Courier New', monospace;
    transition: var(--transition);
}

#regex-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

#clear-btn {
    padding: 12px 24px;
    background: var(--danger-color);
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

#clear-btn:hover {
    background: #ec0c38;
}

.regex-flags {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.regex-flags label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: normal;
    cursor: pointer;
}

.regex-flags input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.test-section {
    background: var(--light);
    padding: 25px;
    border-radius: var(--border-radius);
}

.test-section label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--dark);
}

#test-input {
    width: 100%;
    padding: 12px;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    font-family: 'Courier New', monospace;
    resize: vertical;
    transition: var(--transition);
}

#test-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

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

.matches-section h3 {
    color: var(--dark);
    margin-bottom: 15px;
}

#matches-output {
    background: var(--white);
    padding: 20px;
    border-radius: var(--border-radius);
    min-height: 100px;
}

.no-match {
    color: var(--gray);
    text-align: center;
    padding: 20px;
}

.match-count {
    color: var(--secondary-color);
    font-weight: 600;
    margin-bottom: 15px;
    padding: 10px;
    background: rgba(45, 206, 137, 0.1);
    border-radius: var(--border-radius);
    text-align: center;
}

.match-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 10px;
    margin-bottom: 10px;
    background: var(--light);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--secondary-color);
}

.match-index {
    color: var(--primary-color);
    font-weight: 600;
    min-width: 40px;
}

.match-text {
    flex: 1;
    font-family: 'Courier New', monospace;
    background: var(--white);
    padding: 5px 10px;
    border-radius: 4px;
    word-break: break-all;
}

.match-position {
    color: var(--gray);
    font-size: 0.9rem;
}

.capture-groups {
    margin-left: 55px;
    margin-top: 10px;
}

.capture-group {
    padding: 5px 10px;
    background: rgba(94, 114, 228, 0.1);
    border-radius: 4px;
    margin-bottom: 5px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

.error {
    color: var(--danger-color);
    padding: 15px;
    background: rgba(245, 54, 92, 0.1);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--danger-color);
}

.samples-section {
    margin-top: 30px;
}

.samples-section h2 {
    color: var(--dark);
    margin-bottom: 20px;
}

.sample-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.sample-card {
    padding: 20px;
    background: var(--light);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.sample-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(94, 114, 228, 0.2);
}

.sample-card h3 {
    color: var(--dark);
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.sample-card code {
    display: block;
    padding: 10px;
    background: var(--white);
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    word-break: break-all;
    color: var(--primary-color);
}

.code-generation {
    margin-top: 30px;
    background: var(--light);
    padding: 25px;
    border-radius: var(--border-radius);
}

.code-generation h2 {
    color: var(--dark);
    margin-bottom: 20px;
}

.code-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 2px solid #e9ecef;
}

.code-tab {
    padding: 10px 20px;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--gray);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.code-tab:hover {
    color: var(--primary-color);
}

.code-tab.active {
    color: var(--primary-color);
}

.code-tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

.code-output {
    position: relative;
}

#generated-code {
    background: #2d2d2d;
    color: #f8f8f2;
    padding: 20px;
    border-radius: var(--border-radius);
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    min-height: 200px;
}

#copy-code {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 8px 16px;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

#copy-code:hover {
    background: #4c63d2;
}

.explanation-section {
    margin-top: 30px;
    background: var(--light);
    padding: 25px;
    border-radius: var(--border-radius);
}

.explanation-section h2 {
    color: var(--dark);
    margin-bottom: 20px;
}

.pattern-parts {
    display: grid;
    gap: 10px;
}

.pattern-part {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 12px;
    background: var(--white);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--info-color);
}

.part-pattern {
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--primary-color);
    min-width: 60px;
}

.part-desc {
    color: var(--gray);
    flex: 1;
}

footer {
    text-align: center;
    padding: 30px 0;
    color: var(--white);
    margin-top: 30px;
}

mark {
    background: rgba(45, 206, 137, 0.3);
    padding: 2px 4px;
    border-radius: 2px;
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .lang-switcher {
        position: static;
        justify-content: center;
        margin-top: 20px;
    }
    
    .pattern-blocks {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
    
    .sample-cards {
        grid-template-columns: 1fr;
    }
    
    .code-tabs {
        flex-wrap: wrap;
    }
    
    .match-item {
        flex-direction: column;
        align-items: flex-start;
    }
}