html {
    width: 100vw;
    height: 100vh;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

body {
    width: 100%;
    height: 100%;
    background-color: #2c2c2c;
    color: #e0e0e0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

.container {
    width: 100%;
    height: 100%;
    max-width: 100%;
    margin: 0;
    padding: 20px;
    overflow-y: auto;
    overflow-x: hidden;
    box-sizing: border-box;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #d4a574;
    text-decoration: none;
    font-size: 14px;
    margin-bottom: 20px;
}

.back-link:hover {
    color: #c49464;
}

.header {
    text-align: left;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid #4a4a4a;
}

.header h1 {
    font-size: 28px;
    color: #ffffff;
    margin-bottom: 10px;
}

.header h1 i {
    color: #d4a574;
    margin-right: 10px;
}

.header p {
    color: #a0a0a0;
    font-size: 14px;
    margin: 5px 0;
}

.header code {
    background-color: #3d3d3d;
    padding: 2px 8px;
    border-radius: 4px;
    color: #90ee90;
    font-family: 'Consolas', 'Monaco', monospace;
}

.input-panel {
    background-color: #3d3d3d;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
}

.equation-type-selector {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid #4a4a4a;
}

.equation-type-selector label {
    color: #d4a574;
    font-weight: bold;
    font-size: 14px;
}

.type-btn {
    padding: 8px 16px;
    background-color: #4a4a4a;
    border: 2px solid #5a5a5a;
    border-radius: 8px;
    color: #ffffff;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}

.type-btn:hover {
    background-color: #5a5a5a;
    border-color: #d4a574;
}

.type-btn.active {
    background-color: #d4a574;
    border-color: #d4a574;
    color: #1a1a2e;
}

.input-section {
    display: none;
}

.input-section.active {
    display: block;
}

.parametric-row {
    margin-bottom: 8px;
}

.function-input-group {
    margin-bottom: 15px;
}

.input-row {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.input-row label {
    font-size: 16px;
    color: #d4a574;
    font-weight: bold;
    white-space: nowrap;
}

.input-row input[type="text"] {
    flex: 1;
    min-width: 200px;
    padding: 12px 15px;
    background-color: #2c2c2c;
    border: 2px solid #4a4a4a;
    border-radius: 8px;
    color: #ffffff;
    font-size: 16px;
    font-family: 'Consolas', 'Monaco', monospace;
}

.input-row input[type="text"]:focus {
    outline: none;
    border-color: #d4a574;
}

.input-row input[type="text"]::placeholder {
    color: #666;
}

.function-list-panel {
    margin-bottom: 15px;
}

.function-list-panel h3 {
    font-size: 16px;
    color: #ffffff;
    margin-bottom: 10px;
}

.function-list-panel h3 i {
    margin-right: 8px;
    color: #d4a574;
}

.function-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    min-height: 40px;
    padding: 10px;
    background-color: #2c2c2c;
    border-radius: 8px;
}

.function-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background-color: #4a4a4a;
    border-radius: 6px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 14px;
}

.function-type {
    background-color: #d4a574;
    color: #1a1a2e;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: bold;
}

.function-color {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 2px solid #ffffff;
}

.function-expr {
    color: #ffffff;
}

.function-remove {
    background: none;
    border: none;
    color: #ff6b6b;
    cursor: pointer;
    padding: 2px;
    font-size: 14px;
    transition: color 0.2s;
}

.function-remove:hover {
    color: #ff4444;
}

.quick-functions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.quick-label {
    color: #a0a0a0;
    font-size: 14px;
}

.quick-btn {
    padding: 6px 12px;
    background-color: #4a4a4a;
    border: 1px solid #5a5a5a;
    border-radius: 6px;
    color: #ffffff;
    font-size: 13px;
    font-family: 'Consolas', 'Monaco', monospace;
    cursor: pointer;
    transition: all 0.2s;
}

.quick-btn:hover {
    background-color: #5a5a5a;
    border-color: #d4a574;
}

.control-panel {
    background-color: #3d3d3d;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: center;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.control-group label {
    color: #a0a0a0;
    font-size: 14px;
    white-space: nowrap;
}

.control-group input[type="number"] {
    width: 80px;
    padding: 8px 10px;
    background-color: #2c2c2c;
    border: 1px solid #4a4a4a;
    border-radius: 6px;
    color: #ffffff;
    font-size: 14px;
    text-align: center;
}

.control-group input[type="number"]:focus {
    outline: none;
    border-color: #d4a574;
}

.control-group span {
    color: #666;
    font-size: 14px;
}

.btn-primary,
.btn-success,
.btn-secondary,
.btn-danger,
.btn-info {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background-color: #3498db;
    color: #ffffff;
}

.btn-primary:hover {
    background-color: #2980b9;
}

.btn-success {
    background-color: #27ae60;
    color: #ffffff;
}

.btn-success:hover {
    background-color: #229954;
}

.btn-secondary {
    background-color: #5d6d7e;
    color: #ffffff;
}

.btn-secondary:hover {
    background-color: #4a5a6a;
}

.btn-danger {
    background-color: #c0392b;
    color: #ffffff;
}

.btn-danger:hover {
    background-color: #a93226;
}

.btn-info {
    background-color: #8e44ad;
    color: #ffffff;
}

.btn-info:hover {
    background-color: #7d3c98;
}

.btn-snap {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
    background-color: #5a5a5a;
    color: #ffffff;
}

.btn-snap:hover {
    background-color: #6a6a6a;
}

.btn-snap.active {
    background-color: #e74c3c;
    color: #ffffff;
}

.btn-snap.active:hover {
    background-color: #c0392b;
}

.snap-point {
    fill: #ff0000;
    stroke: #ffffff;
    stroke-width: 2;
    r: 6;
    opacity: 0.9;
    transition: opacity 0.15s;
}

.graph-container {
    background-color: #1a1a2e;
    border-radius: 12px;
    padding: 0;
    margin-bottom: 20px;
    position: relative;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    aspect-ratio: 2 / 1;
    width: 100%;
}

.graph {
    width: 100%;
    height: 100%;
    background-color: #0f0f1a;
    border-radius: 12px;
    overflow: hidden;
}

.graph svg {
    width: 100%;
    height: 100%;
    cursor: grab;
}

.graph svg:active {
    cursor: grabbing;
}

.coordinates {
    position: absolute;
    bottom: 30px;
    right: 30px;
    background-color: rgba(0, 0, 0, 0.7);
    padding: 8px 15px;
    border-radius: 6px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 13px;
    color: #90ee90;
}

.axis path,
.axis line {
    stroke: #4a4a4a;
    stroke-width: 1;
}

.axis text {
    fill: #888;
    font-size: 11px;
}

.axis .domain {
    stroke: #666;
}

.grid line {
    stroke: #2a2a3a;
    stroke-opacity: 0.5;
}

.grid .domain {
    stroke: none;
}

.function-line {
    fill: none;
    stroke-width: 2.5;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.help-panel {
    background-color: #3d3d3d;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
}

.help-panel h3 {
    font-size: 18px;
    color: #ffffff;
    margin-bottom: 15px;
}

.help-panel h3 i {
    margin-right: 8px;
    color: #d4a574;
}

.help-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.help-section h4 {
    font-size: 14px;
    color: #d4a574;
    margin-bottom: 10px;
    border-bottom: 1px solid #4a4a4a;
    padding-bottom: 5px;
}

.help-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.help-section li {
    font-size: 13px;
    color: #a0a0a0;
    padding: 4px 0;
}

.help-section code {
    background-color: #2c2c2c;
    padding: 2px 6px;
    border-radius: 3px;
    color: #90ee90;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 12px;
}

.footer {
    text-align: center;
    color: #a0a0a0;
    font-size: 14px;
    padding: 20px;
    border-top: 1px solid #4a4a4a;
    margin-top: 30px;
}

.footer p {
    margin: 5px 0;
}

.error-message {
    background-color: rgba(192, 57, 43, 0.2);
    border: 1px solid #c0392b;
    color: #ff6b6b;
    padding: 10px 15px;
    border-radius: 6px;
    margin-top: 10px;
    font-size: 14px;
}

.tooltip {
    position: absolute;
    background-color: rgba(0, 0, 0, 0.85);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 13px;
    color: #ffffff;
    pointer-events: none;
    z-index: 100;
    font-family: 'Consolas', 'Monaco', monospace;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    .header h1 {
        font-size: 22px;
    }

    .input-row {
        flex-direction: column;
        align-items: stretch;
    }

    .input-row input[type="text"] {
        min-width: 100%;
    }

    .input-row button {
        width: 100%;
        justify-content: center;
    }

    .control-panel {
        flex-direction: column;
        align-items: stretch;
    }

    .control-group {
        justify-content: space-between;
    }

    .graph {
        height: 350px;
    }

    .help-content {
        grid-template-columns: 1fr;
    }

    .coordinates {
        bottom: 15px;
        right: 15px;
        font-size: 11px;
    }
}