:root {
    --bg-main: #071A4A;
    --bg-secondary: #0C2C6B;
    --bg-dark: #051238;

    --blue-electric: #1A5BFF;
    --blue-neon: #2F7BFF;

    --accent-magenta: #FF4FD8;

    --text-main: #FFFFFF;
    --text-secondary: #F2F6FF;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-main);
    color: var(--text-main);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

header {
    background-color: var(--bg-dark);
    color: var(--text-main);
    padding: 1rem;
    text-align: center;
    border-bottom: 1px solid var(--blue-neon);
}

main {
    padding: 1rem;
}

h2 {
    color: var(--text-secondary);
}

.chart-panel,
.method-panel,
.input-panel,
.table-panel {
    max-width: 1100px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 1rem;
}

.chart-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.chart-header h2 {
    margin: 0;
}

.method-panel {
    background-color: var(--bg-secondary);
    border: 1px solid var(--blue-neon);
    border-radius: 8px;
    padding: 1rem;
}

.method-panel p {
    margin: 0.75rem 0;
    line-height: 1.5;
    color: var(--text-secondary);
}

.formula {
    margin: 0.75rem 0;
    padding: 0.9rem 1rem;
    text-align: center;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-main);
    background-color: var(--bg-dark);
    border: 1px solid var(--blue-neon);
    border-radius: 8px;
}

.input-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.params-grid {
    display: grid;
    grid-template-columns: 1fr;
    row-gap: 1rem;
}

.param-field {
    display: flex;
    flex-direction: column;
    cursor: help;
}

.param-field label {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    margin: 0.5rem 0;
}

.param-field .label-text {
    color: var(--text-main);
}

.param-field .label-text::after {
    content: " *";
    color: var(--text-secondary);
    font-weight: 700;
}

.param-field .label-value {
    width: 100%;
    padding: 0.4rem 0.5rem;
    border-radius: 6px;
    border: 1px solid var(--blue-neon);
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    font-weight: 600;
}

.param-field input {
    margin-bottom: 0.25rem;
    width: 100%;
    max-width: none;
}

.param-field input[type="range"] {
    appearance: none;
    height: 8px;
    border-radius: 999px;
    background: var(--bg-secondary);
    border: 1px solid var(--blue-neon);
    outline: none;
}

.param-field input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--blue-neon);
    cursor: pointer;
    border: none;
}

.param-field input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--blue-neon);
    cursor: pointer;
    border: none;
}

#download,
#toggle-row-limit,
#download-chart {
    color: var(--text-main);
    border: none;
    cursor: pointer;
}

#download,
#toggle-row-limit,
#download-chart {
    background-color: var(--blue-electric);
}

#download:hover,
#toggle-row-limit:hover,
#download-chart:hover {
    background-color: var(--blue-neon);
}

.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.table-actions {
    display: flex;
    gap: 0.5rem;
}

.table-header h2 {
    margin: 0;
}

#download {
    padding: 0.55rem 1rem;
    border-radius: 6px;
}

#download-chart {
    padding: 0.55rem 1rem;
    border-radius: 6px;
    flex-shrink: 0;
}

#toggle-row-limit {
    padding: 0.55rem 1rem;
    border-radius: 6px;
}

.table-hint {
    margin: 0.35rem 0 0.75rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.4;
}

canvas {
    width: 100% !important;
    max-width: 100%;
    margin: 1rem 0;
    background-color: var(--bg-secondary);
    border: 1px solid var(--blue-neon);
    border-radius: 8px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    min-width: 640px;
    background-color: var(--bg-secondary);
    color: var(--text-main);
    border: 1px solid var(--blue-neon);
    border-radius: 8px;
}

table,
th,
td {
    border: 1px solid var(--blue-neon);
}

th,
td {
    padding: 0.5rem;
    text-align: center;
    white-space: nowrap;
}

th {
    background-color: var(--bg-dark);
    color: var(--text-secondary);
    position: sticky;
    top: 0;
    z-index: 1;
}

th:nth-child(1),
td:nth-child(1) {
    position: sticky;
    left: 0;
    z-index: 2;
    background-color: var(--bg-secondary);
}

th:nth-child(1) {
    background-color: var(--bg-dark);
    z-index: 4;
}

th:nth-child(2),
td:nth-child(2) {
    position: sticky;
    left: 52px;
    z-index: 2;
    background-color: var(--bg-secondary);
}

th:nth-child(2) {
    background-color: var(--bg-dark);
    z-index: 4;
}

th:nth-child(3),
td:nth-child(3) {
    position: sticky;
    left: 151px;
    z-index: 2;
    background-color: var(--bg-secondary);
}

th:nth-child(3) {
    background-color: var(--bg-dark);
    z-index: 4;
}

@media (min-width: 500px) {
    .params-grid {
        grid-template-columns: repeat(5, minmax(0, 1fr));
        row-gap: 1rem;
        column-gap: 1.1rem;
    }
}