/* Palette: cool sky paper, navy ink, and the blue from the
   original site (Bootstrap link blue) as the single accent. */
:root {
    --paper: #eef2f5;
    --ink: #14213d;
    --muted: #5b6b82;
    --rule: #c9d3de;
    --accent: #007bff;
    --terrain-opacity: .16;
    --airspace-opacity: .14;
    --rail-opacity: .14;

    --font: "Manrope", system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --paper: #0f1a2b;
        --ink: #e6ecf3;
        --muted: #93a3b8;
        --rule: #2a3a52;
        --accent: #4da3ff;
        --terrain-opacity: .16;
        --airspace-opacity: .16;
        --rail-opacity: .2;
    }
}

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

html {
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--font);
    font-size: 1.125rem;
    line-height: 1.55;
}

.page {
    max-width: 38rem;
    min-height: 100vh;
    margin: 0 auto;
    padding: clamp(4rem, 14vh, 9rem) 1.5rem 2rem;
    display: flex;
    flex-direction: column;
}

/* Chart background: drawn inline in index.html with currentColor, so the
   colours follow the theme. It fades in faintly, and is fainter still
   behind the text so that stays easy to read. */

.chart {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    /* The SVG has opacity="0" as a fallback so it stays hidden if this
       stylesheet ever fails to load; CSS overrides it here. */
    opacity: 1;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    -webkit-mask-image: radial-gradient(ellipse 42% 38% at 50% 28%, rgba(0, 0, 0, .3), #000);
    mask-image: radial-gradient(ellipse 42% 38% at 50% 28%, rgba(0, 0, 0, .3), #000);
    animation: chart-in 2.4s ease .8s both;
}

.chart text {
    fill: currentColor;
    stroke: none;
    font-family: var(--font);
    font-weight: 700;
}

.chart .it {
    font-style: italic;
}

.chart .mef {
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* CTR with a surface lower limit is tinted; tint banding marks the
   outer edge of controlled airspace. */
.chart .surface {
    fill: currentColor;
    fill-opacity: .12;
    stroke: none;
}

.chart .band {
    stroke-opacity: .35;
}

.chart .water {
    color: var(--accent);
}

.chart-terrain {
    color: var(--muted);
    opacity: var(--terrain-opacity);
}

.chart-rail {
    color: var(--ink);
    opacity: var(--rail-opacity);
}

.chart .rail-core {
    stroke: var(--paper);
}

.chart-airspace {
    color: var(--accent);
    opacity: var(--airspace-opacity);
}

@keyframes chart-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* Intro */

.name {
    margin: 0;
    font-size: clamp(2rem, 9vw, 3.9rem);
    font-weight: 700;
    line-height: 0.95;
    letter-spacing: -0.03em;
}

.route {
    position: relative;
    height: 14px;
    margin: 1.75rem 0 1.5rem;
    background: repeating-linear-gradient(90deg, var(--accent) 0 6px, transparent 6px 11px)
        center / calc(100% - 24px) 2px no-repeat;
    animation: plot 1.4s cubic-bezier(.6, 0, .2, 1) .2s both;
}

/* Departure: open circle. Destination: filled waypoint triangle. */
.route::before,
.route::after {
    content: "";
    position: absolute;
    top: 0;
    width: 14px;
    height: 14px;
}

.route::before {
    left: 0;
    border: 2px solid var(--accent);
    border-radius: 50%;
    background: var(--paper);
}

.route::after {
    right: 0;
    background: var(--accent);
    clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

@keyframes plot {
    from { clip-path: inset(0 100% 0 0); }
    to   { clip-path: inset(0 0 0 0); }
}

.role {
    margin: 0;
    font-size: 1.3rem;
    color: var(--ink);
}

.links {
    display: flex;
    gap: 1.5rem;
    margin-top: 1.75rem;
}

a {
    color: var(--ink);
    text-decoration-color: var(--accent);
    text-decoration-thickness: 2px;
    text-underline-offset: 0.25em;
}

a:hover {
    color: var(--accent);
}

a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 2px;
}

.links a {
    font-weight: 500;
}

/* Footer */

.footer {
    margin-top: auto;
    padding-top: 4rem;
    font-size: 0.875rem;
    color: var(--muted);
}

.footer p {
    margin: 0;
}

@media (prefers-reduced-motion: reduce) {
    .route,
    .chart {
        animation: none;
    }
}