:root {
    --primary-black: #0a0a0a;
    --secondary-black: #1a1a1a;
    --accent-blue: #2563eb;
    --accent-blue-light: #3b82f6;
    --accent-blue-dark: #1d4ed8;
    --text-white: #f8fafc;
    --text-gray: #cbd5e1;
    --border-dark: #374151;
    --shadow-blue: rgba(37, 99, 235, 0.2);
    --success-green: #10b981;
    --error-red: #ef4444;
    --warning-yellow: #f59e0b;
    --info-purple: #8b5cf6;
    --math-orange: #f97316;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--primary-black);
    color: var(--text-white);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.math-topbar {
    background-color: var(--secondary-black);
    border-bottom: 2px solid var(--accent-blue);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.math-topbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.math-title {
    color: var(--text-white);
    font-weight: 700;
    font-size: 1.3rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.math-title::before {
    content: "🧮";
    font-size: 1.4rem;
}

.math-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.btn-math {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 0.95rem;
    background-color: transparent;
    color: var(--text-white);
    border: 2px solid var(--border-dark);
    text-decoration: none;
    min-width: 100px;
}

.btn-math:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.btn-math.primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-blue-dark));
    border-color: var(--accent-blue);
    color: white;
    box-shadow: 0 4px 15px var(--shadow-blue);
}

.btn-math.primary:hover {
    background: linear-gradient(135deg, var(--accent-blue-dark), #1e40af);
    border-color: var(--accent-blue-dark);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px var(--shadow-blue);
}

.btn-math.active {
    border-color: var(--accent-blue);
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--accent-blue-light);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.15);
}

.btn-math:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.math-layout {
    padding: 2rem 0;
}

.math-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 1.5rem;
}

.math-panel {
    background-color: var(--secondary-black);
    border: 1px solid var(--border-dark);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 10px 35px rgba(0, 0, 0, 0.4);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.math-panel:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.5);
}

.math-panel h2,
.math-panel h3 {
    color: var(--text-white);
    margin-bottom: 1rem;
    font-weight: 700;
}

.math-panel h2 {
    font-size: 1.5rem;
    border-bottom: 2px solid var(--accent-blue);
    padding-bottom: 0.5rem;
}

.math-panel h3 {
    font-size: 1.25rem;
}

.math-panel p,
.math-panel li {
    color: var(--text-gray);
    margin-bottom: 0.75rem;
}

.math-panel ul,
.math-panel ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.math-panel code {
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--accent-blue-light);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.math-panel pre {
    background-color: var(--primary-black);
    border: 1px solid var(--border-dark);
    border-radius: 10px;
    padding: 1.25rem;
    overflow: auto;
    margin: 1rem 0;
    position: relative;
}

.math-panel pre code {
    background: none;
    color: var(--text-white);
    padding: 0;
}

.math-panel blockquote {
    border-left: 4px solid var(--accent-blue);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--text-gray);
    font-style: italic;
}

.math-calculator-container {
    display: flex;
    width: 100%;
    height: 340px;
    margin-top: 1rem;
    border-radius: 12px;
    border: 1px solid var(--border-dark);
    background-color: var(--primary-black);
    overflow: hidden;
    position: relative;
}

.math-formula-editor {
    width: 50px;
    min-width: 50px;
    padding: 1rem 0.5rem;
    text-align: right;
    font-family: 'Cambria Math', 'Times New Roman', serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--text-gray);
    background-color: var(--secondary-black);
    border-right: 1px solid var(--border-dark);
    overflow-y: hidden;
    user-select: none;
    pointer-events: none;
}

.math-editor {
    flex: 1;
    height: 100%;
    padding: 1rem;
    border: none;
    background-color: var(--primary-black);
    color: var(--text-white);
    font-family: 'Cambria Math', 'Times New Roman', serif;
    font-size: 17px;
    line-height: 1.5;
    outline: none;
    resize: none;
    overflow-y: auto;
    overflow-x: auto;
    white-space: pre;
    tab-size: 4;
    caret-color: var(--accent-blue);
}

.math-editor::selection {
    background-color: rgba(37, 99, 235, 0.3);
}

.math-editor:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.math-output {
    margin-top: 1rem;
    background-color: var(--primary-black);
    border: 1px solid var(--border-dark);
    border-radius: 12px;
    padding: 1.25rem;
    min-height: 150px;
    max-height: 300px;
    overflow-y: auto;
    white-space: pre-wrap;
    color: var(--text-white);
    font-family: 'Cambria Math', 'Times New Roman', serif;
    font-size: 16px;
    line-height: 1.6;
}

.math-output.error {
    border-color: var(--error-red);
    background-color: rgba(239, 68, 68, 0.05);
}

.math-output.success {
    border-color: var(--success-green);
    background-color: rgba(16, 185, 129, 0.05);
}

.math-problems-navigation {
    margin-bottom: 1.5rem;
    padding: 1.25rem;
    background-color: var(--secondary-black);
    border-radius: 12px;
    border: 1px solid var(--border-dark);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.math-problems-navigation h3 {
    color: var(--text-white);
    margin-bottom: 1rem;
    font-size: 1.2rem;
    font-weight: 600;
}

.math-problems-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.math-problem-link {
    display: inline-block;
    padding: 0.6rem 1rem;
    background-color: var(--primary-black);
    border: 2px solid var(--border-dark);
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-gray);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    min-width: 60px;
    text-align: center;
}

.math-problem-link:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.math-problem-link.active {
    background-color: rgba(37, 99, 235, 0.1);
    border-color: var(--accent-blue);
    color: var(--accent-blue-light);
    font-weight: 600;
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.math-pagination {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 1.5rem 0;
    padding: 1rem 0;
    border-top: 1px solid var(--border-dark);
    border-bottom: 1px solid var(--border-dark);
}

.btn-math-pagination {
    padding: 0.7rem 1.5rem;
    background-color: var(--secondary-black);
    border: 2px solid var(--border-dark);
    border-radius: 8px;
    color: var(--text-white);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 160px;
}

.btn-math-pagination:hover:not(:disabled) {
    border-color: var(--accent-blue);
    color: var(--accent-blue-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.btn-math-pagination:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.math-progress-text {
    font-weight: 700;
    color: var(--text-white);
    font-size: 1.1rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 1rem 1.5rem;
    border-radius: 10px;
    z-index: 10000;
    font-weight: 600;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
    animation: slideIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    max-width: 400px;
    backdrop-filter: blur(10px);
}

.notification.success {
    background: linear-gradient(135deg, var(--success-green), #059669);
    color: white;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.notification.error {
    background: linear-gradient(135deg, var(--error-red), #dc2626);
    color: white;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.notification.info {
    background: linear-gradient(135deg, var(--accent-blue), #1d4ed8);
    color: white;
    border: 1px solid rgba(37, 99, 235, 0.3);
}

.notification.warning {
    background: linear-gradient(135deg, var(--warning-yellow), #d97706);
    color: white;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

.error-message {
    padding: 1rem;
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error-red);
    border-radius: 8px;
    color: var(--error-red);
    margin: 1rem 0;
}

.success-message {
    padding: 1rem;
    background-color: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--success-green);
    border-radius: 8px;
    color: var(--success-green);
    margin: 1rem 0;
}

.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 3rem;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-dark);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.hint {
    background-color: rgba(139, 92, 246, 0.1);
    border-left: 4px solid var(--info-purple);
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 0 8px 8px 0;
}

.hint h4 {
    color: var(--info-purple);
    margin-bottom: 0.5rem;
}

@media (max-width: 1024px) {
    .math-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .math-calculator-container {
        height: 300px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .math-topbar .container {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }
    
    .math-actions {
        justify-content: center;
    }
    
    .btn-math {
        flex: 1;
        min-width: 0;
        padding: 0.5rem 0.8rem;
        font-size: 0.9rem;
    }
    
    .math-title {
        text-align: center;
        font-size: 1.1rem;
    }
    
    .math-pagination {
        flex-direction: column;
        gap: 1rem;
    }
    
    .btn-math-pagination {
        width: 100%;
        min-width: 0;
    }
    
    .math-progress-text {
        order: -1;
        margin-bottom: 0.5rem;
    }
    
    .math-problems-list {
        justify-content: center;
    }
    
    .math-panel {
        padding: 1.25rem;
    }
    
    .math-editor {
        font-size: 16px;
        padding: 0.75rem;
    }
}

@media (max-width: 480px) {
    .btn-math {
        padding: 0.4rem 0.6rem;
        font-size: 0.85rem;
    }
    
    .math-panel h2 {
        font-size: 1.3rem;
    }
    
    .math-panel h3 {
        font-size: 1.1rem;
    }
    
    .notification {
        left: 10px;
        right: 10px;
        max-width: none;
    }
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--secondary-black);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: var(--border-dark);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-blue);
}

::selection {
    background-color: rgba(37, 99, 235, 0.3);
    color: var(--text-white);
}

:focus-visible {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.math-panel {
    animation: fadeInUp 0.5s ease-out;
}

.math-formula-example {
    position: relative;
    margin: 1.5rem 0;
}

.math-formula-example .copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--secondary-black);
    border: 1px solid var(--border-dark);
    color: var(--text-gray);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.3s;
}

.math-formula-example .copy-btn:hover {
    background: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
}

.difficulty-badge {
    display: inline-block;
    padding: 0.3rem 0.7rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-left: 0.5rem;
    vertical-align: middle;
}

.difficulty-badge.easy {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success-green);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.difficulty-badge.medium {
    background: rgba(249, 115, 22, 0.2);
    color: var(--math-orange);
    border: 1px solid rgba(249, 115, 22, 0.3);
}

.difficulty-badge.hard {
    background: rgba(139, 92, 246, 0.2);
    color: var(--info-purple);
    border: 1px solid rgba(139, 92, 246, 0.3);
}

/* Математические специфичные стили */
.equation-display {
    font-size: 1.3rem;
    padding: 1rem;
    background-color: rgba(37, 99, 235, 0.05);
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: 8px;
    margin: 1rem 0;
    text-align: center;
    font-family: 'Cambria Math', 'Times New Roman', serif;
}

.geometry-canvas {
    width: 100%;
    height: 300px;
    background-color: var(--primary-black);
    border: 1px solid var(--border-dark);
    border-radius: 10px;
    margin: 1rem 0;
}

.math-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    background-color: var(--secondary-black);
    border-radius: 8px;
    overflow: hidden;
}

.math-table th {
    background-color: var(--accent-blue);
    color: white;
    padding: 0.75rem;
    text-align: left;
    font-weight: 600;
}

.math-table td {
    padding: 0.75rem;
    border-top: 1px solid var(--border-dark);
    color: var(--text-gray);
}

.math-table tr:hover td {
    background-color: rgba(37, 99, 235, 0.1);
}

.coordinate-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.5rem;
    margin: 1rem 0;
}

.coordinate-point {
    background-color: rgba(37, 99, 235, 0.1);
    border: 1px solid rgba(37, 99, 235, 0.3);
    border-radius: 6px;
    padding: 0.5rem;
    text-align: center;
    font-family: 'Courier New', monospace;
}

.proof-container {
    background-color: rgba(139, 92, 246, 0.05);
    border-left: 4px solid var(--info-purple);
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 0 8px 8px 0;
}

.proof-container h4 {
    color: var(--info-purple);
    margin-bottom: 0.5rem;
}

.formula-symbol {
    color: var(--accent-blue);
    font-weight: bold;
}

.formula-variable {
    color: var(--math-orange);
    font-style: italic;
}

.formula-constant {
    color: var(--success-green);
}

.formula-operator {
    color: var(--text-white);
}