:root {
    color-scheme: light;
    --bg: #f6f3ee;
    --panel: #ffffff;
    --ink: #1f1f1f;
    --muted: #6b6b6b;
    --line: #e8e2d9;
    --accent: #2c2c2c;
    --shadow: 0 10px 30px rgba(25, 25, 25, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "IBM Plex Sans", "Space Grotesk", system-ui, sans-serif;
    background: radial-gradient(circle at top left, #faf7f1 0%, var(--bg) 60%);
    color: var(--ink);
}

.container {
    display: grid;
    grid-template-columns: 300px minmax(0, 1fr);
    gap: 28px;
    padding: 40px;
    align-items: start;
    max-width: 1200px;
    margin: 0 auto;
}

.main {
    display: grid;
    gap: 18px;
    justify-items: start;
}

.panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
    padding: 24px;
    position: sticky;
    top: 32px;
}

.panel__header h1 {
    margin: 0 0 6px;
    font-size: 20px;
    letter-spacing: 0.2px;
}

.panel__subtitle {
    margin: 0;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.5;
}

.panel__section {
    margin-top: 20px;
    display: grid;
    gap: 10px;
}

.section__title {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--muted);
}

.segmented {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border: 1px solid var(--line);
    border-radius: 10px;
    overflow: hidden;
    background: #f9f6f1;
}

.segment {
    appearance: none;
    border: none;
    background: transparent;
    padding: 8px 6px;
    font-size: 12px;
    cursor: pointer;
    color: var(--muted);
}

.segment.active {
    background: var(--accent);
    color: #ffffff;
}

.toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    font-size: 12px;
    color: var(--muted);
    padding: 6px 8px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #fbf9f5;
}

.toggle__label {
    font-size: 12px;
    color: var(--muted);
}

.toggle input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.toggle__switch {
    width: 34px;
    height: 20px;
    border-radius: 999px;
    background: #e6e1d8;
    position: relative;
    transition: background 160ms ease;
    flex-shrink: 0;
}

.toggle__switch::after {
    content: "";
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #ffffff;
    position: absolute;
    top: 2px;
    left: 2px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
    transition: transform 160ms ease;
}

.toggle input:checked + .toggle__switch {
    background: #1f1f1f;
}

.toggle input:checked + .toggle__switch::after {
    transform: translateX(14px);
}

.field {
    display: grid;
    gap: 6px;
    font-size: 12px;
    color: var(--muted);
}

.field-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

input,
select,
textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 8px 10px;
    background: #ffffff;
    color: var(--ink);
    font-size: 13px;
    font-family: inherit;
}

textarea {
    resize: vertical;
}

input:disabled,
select:disabled,
textarea:disabled {
    opacity: 0.6;
    background: #f3efe9;
}

.ghost {
    appearance: none;
    border: 1px solid var(--line);
    background: #ffffff;
    color: var(--ink);
    padding: 8px 12px;
    border-radius: 10px;
    font-size: 12px;
    cursor: pointer;
    transition: border 120ms ease, transform 120ms ease;
}

.ghost:hover {
    border-color: var(--accent);
    transform: translateY(-1px);
}

.button-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(70px, 1fr));
    gap: 8px;
}

.status {
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 10px 12px;
    font-size: 12px;
    color: var(--muted);
    background: #fbf9f5;
    min-height: 38px;
}

.panel__help {
    margin: 0;
    font-size: 12px;
    line-height: 1.6;
    color: var(--muted);
    background: #fbf9f5;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 10px 12px;
}

.helper {
    width: 100%;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
    padding: 18px;
}

.visited-list {
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 10px 12px;
    background: #fbf9f5;
    min-height: 48px;
    font-size: 12px;
    color: var(--muted);
    line-height: 1.6;
    max-height: 140px;
    overflow: auto;
}

.panel__hint {
    margin: 0;
    color: var(--muted);
    font-size: 12px;
}

.primary {
    appearance: none;
    border: 1px solid var(--accent);
    background: var(--accent);
    color: #ffffff;
    padding: 10px 14px;
    border-radius: 10px;
    font-size: 14px;
    cursor: pointer;
    transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease;
}

.primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 18px rgba(20, 20, 20, 0.2);
}

.primary:active {
    transform: translateY(0);
    box-shadow: none;
}

.canvas-wrap {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 20px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 560px;
    width: fit-content;
    max-width: 100%;
    justify-self: start;
}

#canvas {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

#canvas canvas {
    display: block;
    border-radius: 12px;
}

@media (max-width: 900px) {
    .container {
        grid-template-columns: 1fr;
        padding: 24px;
    }

    .panel {
        position: static;
    }

    .field-grid {
        grid-template-columns: 1fr;
    }
}