/* Interplanetary Logistics: styles specific to this tool.
   Tokens, header, footer, buttons and cards come from site.css (shared with the
   landing site), so everything here uses those tokens and follows the visitor's
   light or dark setting. */

:root {
    --earth: #2563eb;
    --mars: #e11d48;
    --danger: #b42318;
}

@media (prefers-color-scheme: dark) {
    :root {
        --earth: #60a5fa;
        --mars: #fb7185;
        --danger: #fda29b;
    }
}

[hidden] { display: none !important; }

/* ---------- layout ---------- */
.tool {
    display: grid;
    grid-template-columns: minmax(18.5rem, 22.5rem) minmax(0, 1fr);
    gap: 1.5rem;
    align-items: start;
    padding-block: clamp(2rem, 5vw, 3.5rem);
}

.form-card { position: sticky; top: 5.5rem; }

.results-col, #results { display: grid; gap: 1.5rem; }

.card h2 { margin: 0 0 0.25rem; font-size: 1.15rem; }

.hint { margin: 0 0 1rem; color: var(--muted); font-size: 0.9rem; }

.status { margin: 0; color: var(--muted); }
.status:empty { display: none; }

/* ---------- form ---------- */
.presets { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.25rem; }

.presets-label, legend {
    color: var(--muted);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.presets-label { width: 100%; }
#presets { display: contents; }

/* Toggle buttons in the same pill style as the landing site's links */
.chip {
    padding: 0.35rem 0.8rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface);
    color: var(--text);
    font: inherit;
    font-size: 0.92rem;
    cursor: pointer;
    transition: border-color 0.15s, transform 0.15s, background 0.15s;
}

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

.chip[aria-pressed="true"] {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 24%, var(--surface));
    color: var(--text);
    font-weight: 600;
}

fieldset { margin: 0 0 1.25rem; padding: 0; border: 0; }
legend { margin-bottom: 0.5rem; padding: 0; }

.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }

label { display: grid; gap: 0.25rem; color: var(--muted); font-size: 0.85rem; }

input[type="date"] {
    width: 100%;
    min-width: 0;
    height: 2.75rem;
    padding: 0 0.75rem;
    border: 1px solid var(--border);
    border-radius: 0.6rem;
    background: var(--surface);
    color: var(--text);
    font: inherit;
    font-size: 0.95rem;
    font-variant-numeric: tabular-nums;
}

input[type="date"]:hover { border-color: var(--link); }
input[type="date"]:focus-visible { outline-offset: 0; }

#submit { width: 100%; }
#submit[aria-busy="true"] { cursor: progress; opacity: 0.75; }
#submit:disabled { transform: none; }

.spinner {
    display: none;
    width: 1em;
    height: 1em;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

#submit[aria-busy="true"] .spinner { display: block; }

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

.form-error {
    margin: 0.75rem 0 0;
    padding: 0.6rem 0.85rem;
    border: 1px solid var(--danger);
    border-radius: 0.6rem;
    background: color-mix(in srgb, var(--danger) 10%, var(--surface));
    color: var(--danger);
    font-size: 0.95rem;
}

/* ---------- price ---------- */
.price-card {
    flex-direction: row; /* .card in site.css is a column */
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 0.75rem 1.5rem;
    border-left: 4px solid var(--accent);
}

.price { display: flex; align-items: baseline; gap: 0.6rem; margin: 0; }

#out-price {
    font-size: clamp(2.6rem, 7vw, 3.75rem);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
}

.unit { color: var(--muted); font-size: 1.1rem; }

.price-basis { margin: 0; color: var(--muted); font-size: 0.9rem; }

/* ---------- transfer summary ---------- */
.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    margin-top: 1rem;
}

.stat {
    padding: 0.85rem 1rem;
    border: 1px solid var(--border);
    border-radius: 0.8rem;
    background: var(--bg-alt);
}

.stat .label {
    display: block;
    margin-bottom: 0.15rem;
    color: var(--muted);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.stat .value {
    display: block;
    font-size: 1.2rem;
    font-weight: 700;
    line-height: 1.4;
    font-variant-numeric: tabular-nums;
}

.budget { margin-top: 1.25rem; }

.split { display: flex; height: 0.65rem; overflow: hidden; border-radius: 999px; background: var(--bg-alt); }
.seg { height: 100%; }
.seg-dep, .swatch-dep { background: var(--earth); }
.seg-arr, .swatch-arr { background: var(--mars); }
.seg-dep { width: 50%; }
.seg-arr { width: 50%; margin-left: 2px; }

.budget-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 1.25rem;
    margin-top: 0.6rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.budget-legend b { color: var(--text); font-variant-numeric: tabular-nums; }

.swatch { display: inline-block; width: 0.65rem; height: 0.65rem; margin-right: 0.45rem; border-radius: 0.2rem; }

/* ---------- porkchop plot ---------- */
.plot { position: relative; }

canvas {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 10;
    touch-action: pan-y;

    /* read by js/porkchop.js */
    --plot-text: var(--text);
    --plot-muted: var(--muted);
    --plot-grid: rgb(18 26 43 / 0.2);
    --plot-frame: rgb(18 26 43 / 0.4);
    --plot-empty: rgb(18 26 43 / 0.05);
    --plot-cursor: rgb(18 26 43 / 0.8);
    --plot-marker: #121a2b;
    --plot-marker-halo: rgb(255 255 255 / 0.9);
}

@media (prefers-color-scheme: dark) {
    canvas {
        --plot-grid: rgb(255 255 255 / 0.16);
        --plot-frame: rgb(255 255 255 / 0.3);
        --plot-empty: rgb(255 255 255 / 0.04);
        --plot-cursor: rgb(255 255 255 / 0.75);
        --plot-marker: #ffffff;
        --plot-marker-halo: rgb(7 11 24 / 0.85);
    }
}

.tip {
    position: absolute;
    z-index: 2;
    display: grid;
    gap: 0.1rem;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 0.6rem;
    background: var(--surface);
    box-shadow: var(--shadow);
    font-size: 0.85rem;
    white-space: nowrap;
    pointer-events: none;
}

.tip b { font-size: 1rem; font-variant-numeric: tabular-nums; }
.tip span { color: var(--muted); }

.legend {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 0.85rem;
    color: var(--muted);
    font-size: 0.85rem;
    font-variant-numeric: tabular-nums;
}

.legend-bar { flex: 1; height: 0.5rem; border-radius: 999px; }

#plot-note { margin: 0.6rem 0 0; }

/* ---------- notes ---------- */
.notes summary { cursor: pointer; font-weight: 700; }
.notes ul { margin: 0.85rem 0 0; padding-left: 1.25rem; color: var(--muted); font-size: 0.95rem; }
.notes li + li { margin-top: 0.5rem; }

/* ---------- entrance ---------- */
#results > * { animation: rise 0.45s ease both; }
#results > :nth-child(2) { animation-delay: 0.06s; }
#results > :nth-child(3) { animation-delay: 0.12s; }
#results > :nth-child(4) { animation-delay: 0.18s; }

@keyframes rise { from { opacity: 0; transform: translateY(10px); } }

/* ---------- responsive ---------- */
@media (max-width: 56rem) {
    .tool { grid-template-columns: 1fr; }
    .form-card { position: static; }
}

@media (max-width: 35rem) {
    .stats { grid-template-columns: repeat(2, 1fr); }
    canvas { aspect-ratio: 4 / 3; }
}