/* Gleitschirm-Wissen Zentralschweiz (euroflugschule.ch) */
:root {
    --ink: #13202b;
    --ink-soft: #4a5a68;
    --ink-muted: #73818d;
    --bg: #f6f8f9;
    --surface: #ffffff;
    --line: #dbe3e8;
    --accent: #1f6f8b;
    --accent-dark: #164f63;
    --warm: #b4691f;
    --warn-bg: #fff5e8;
    --radius: 12px;
    --max: 1080px;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --ink: #e6edf1;
        --ink-soft: #b3c0c9;
        --ink-muted: #8a98a3;
        --bg: #0f171d;
        --surface: #16222a;
        --line: #26353f;
        --accent: #5fb3d1;
        --accent-dark: #8fcbe0;
        --warm: #e3a35f;
        --warn-bg: #2a2218;
    }
}

* { box-sizing: border-box; }

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

body {
    margin: 0;
    font-family: var(--font);
    color: var(--ink);
    background: var(--bg);
    line-height: 1.65;
}

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

.container { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

.operator {
    font-size: .82rem;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    color: var(--ink-soft);
    padding: 8px 0;
    text-align: center;
}

.site-header { background: var(--surface); border-bottom: 1px solid var(--line); }

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    padding-top: 14px;
    padding-bottom: 14px;
}

.brand { text-decoration: none; color: var(--ink); line-height: 1.2; }
.brand strong { display: block; font-size: 1.15rem; letter-spacing: .01em; }
.brand span { font-size: .78rem; color: var(--ink-muted); }

.nav { display: flex; flex-wrap: wrap; gap: 4px 18px; font-size: .95rem; }
.nav a { color: var(--ink-soft); text-decoration: none; padding: 4px 0; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--accent); }

.hero {
    background: linear-gradient(135deg, #16405a 0%, #1f6f8b 100%);
    color: #fff;
    padding: 56px 0 48px;
}

.hero h1 { font-size: clamp(1.9rem, 5vw, 2.8rem); line-height: 1.15; margin: 0 0 12px; }
.hero p { max-width: 680px; margin: 0; font-size: 1.1rem; opacity: .92; }
.hero .kicker { text-transform: uppercase; letter-spacing: .1em; font-size: .78rem; opacity: .8; margin-bottom: 10px; }

main { padding: 40px 0 56px; }

.article { max-width: 760px; }
.article h2 { margin: 2.2rem 0 .6rem; font-size: 1.45rem; line-height: 1.25; }
.article h3 { margin: 1.6rem 0 .4rem; font-size: 1.12rem; }
.article ul { padding-left: 1.2rem; }
.article li { margin: .25rem 0; }

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
    margin: 24px 0;
}

.card {
    display: block;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 20px;
    color: var(--ink);
    text-decoration: none;
}

a.card:hover { border-color: var(--accent); color: var(--ink); }
.card h3 { margin: 0 0 6px; font-size: 1.12rem; }
.card p { margin: 0; color: var(--ink-soft); font-size: .95rem; }
.card .tag { display: inline-block; font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; color: var(--warm); margin-bottom: 6px; }

.note {
    background: var(--warn-bg);
    border-left: 4px solid var(--warm);
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 14px 18px;
    margin: 20px 0;
}

.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; margin: 12px 0 20px; font-size: .95rem; }
th, td { text-align: left; padding: 8px 12px 8px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--ink-soft); font-weight: 600; }

.sources { font-size: .88rem; color: var(--ink-muted); }

.site-footer {
    border-top: 1px solid var(--line);
    background: var(--surface);
    padding: 28px 0;
    font-size: .9rem;
    color: var(--ink-soft);
}

.site-footer .container { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 24px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 6px 18px; }
.site-footer a { color: var(--ink-soft); }

/* Polar calculator */
.calc { display: grid; grid-template-columns: minmax(280px, 380px) 1fr; gap: 24px; align-items: start; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.panel h2 { margin: 0 0 12px; font-size: 1.1rem; }
.field { margin-bottom: 14px; }
.field label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: 4px; }
.field small { display: block; color: var(--ink-muted); font-size: .8rem; }
.field select, .field input[type="number"] { width: 100%; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; font: inherit; background: var(--bg); color: var(--ink); }
.field input[type="range"] { width: 100%; }
.points { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.points input { width: 100%; padding: 6px 8px; border: 1px solid var(--line); border-radius: 6px; font: inherit; background: var(--bg); color: var(--ink); }
.points span { font-size: .75rem; color: var(--ink-muted); }
.results { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin-top: 16px; }
.result { background: var(--bg); border-radius: 10px; padding: 12px 14px; }
.result b { display: block; font-size: 1.35rem; color: var(--accent); }
.result span { font-size: .82rem; color: var(--ink-soft); }
.chart { width: 100%; height: auto; display: block; }
.chart .axis { stroke: var(--ink-muted); stroke-width: 1; }
.chart .grid { stroke: var(--line); stroke-width: 1; }
.chart .curve { fill: none; stroke: var(--accent); stroke-width: 3; }
.chart .tangent { stroke: var(--warm); stroke-width: 2; stroke-dasharray: 6 5; }
.chart .dot { fill: var(--warm); }
.chart .pt { fill: var(--accent); }
.chart text { fill: var(--ink-soft); font-size: 12px; font-family: var(--font); }

@media (max-width: 760px) {
    .calc { grid-template-columns: 1fr; }
    .hero { padding: 40px 0 32px; }
}