/* SPDX-License-Identifier: AGPL-3.0-or-later */
/* BetterWheel landing page — self-contained, no build step, no external assets.
   Palette mirrors the desktop app: GitHub-dark canvas, signature green accent,
   gold/teal highlights, loss-red for the payoff downside. */
:root {
  --bg: #0d1117;
  --panel: #121922;
  --panel-2: #0f141b;
  --border: #1d2733;
  --text: #d7dee8;
  --muted: #9fb0c3;
  --faint: #6b7787;
  --green: #33d18f;
  --green-soft: #b9f0d2;
  --teal: #5bc0de;
  --gold: #e6c270;
  --loss: #ff6b81;
  --maxw: 60rem;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
  background:
    radial-gradient(1200px 600px at 50% -10%, #14241d 0%, transparent 60%),
    var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; }

.accent { color: var(--green); }
.muted { color: var(--faint); font-weight: 400; }

code {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.9em;
  background: color-mix(in srgb, var(--green) 12%, transparent);
  color: var(--green-soft);
  padding: 0.05rem 0.35rem;
  border-radius: 0.3rem;
}

/* ---- hero --------------------------------------------------------------- */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2rem;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 3.5rem;
}

.wordmark { font-weight: 800; font-size: 1.2rem; letter-spacing: -0.02em; }

.ghost {
  color: var(--muted);
  font-size: 0.9rem;
  border: 1px solid var(--border);
  padding: 0.35rem 0.7rem;
  border-radius: 0.5rem;
}
.ghost:hover { text-decoration: none; border-color: var(--green); color: var(--text); }

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
  max-width: 18ch;
}

.tagline {
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  color: var(--muted);
  max-width: 56ch;
  margin: 0 0 1.75rem;
}

.cta { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.btn {
  display: inline-block;
  padding: 0.7rem 1.3rem;
  border-radius: 0.6rem;
  font-weight: 600;
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--panel);
  transition: transform 0.06s ease, border-color 0.15s ease;
}
.btn:hover { text-decoration: none; border-color: var(--green); transform: translateY(-1px); }
.btn.primary {
  background: linear-gradient(180deg, #3ee49c, #2bb87c);
  color: #062013;
  border-color: transparent;
}
.btn.primary:hover { filter: brightness(1.05); }

.badges { margin-top: 2rem; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.badge {
  font-size: 0.78rem;
  color: var(--muted);
  background: var(--panel-2);
  border: 1px solid var(--border);
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
}

/* ---- sections ----------------------------------------------------------- */
main { max-width: var(--maxw); margin: 0 auto; padding: 0 1.25rem; }

section {
  padding: 3rem 0;
  border-top: 1px solid var(--border);
}

h2 {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}
h2::before { content: ""; }

.lead { color: var(--muted); max-width: 64ch; margin: 0 0 1.75rem; }

h3 { margin: 0 0 0.4rem; font-size: 1.05rem; }

/* ---- cards / grids ------------------------------------------------------ */
.grid { display: grid; gap: 1rem; }
.grid.two { grid-template-columns: repeat(2, 1fr); }
.grid.three { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  padding: 1.1rem 1.2rem;
}
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.card.step { position: relative; padding-top: 1.4rem; }
.card.step .num {
  position: absolute;
  top: -0.8rem;
  left: 1.1rem;
  width: 1.7rem; height: 1.7rem;
  display: grid; place-items: center;
  font-weight: 700; font-size: 0.9rem;
  color: #062013;
  background: var(--green);
  border-radius: 999px;
}

.card.safe { border-left: 3px solid var(--green); }
.card.impl { border-left: 3px solid var(--teal); }
.card.note { border-left: 3px solid var(--gold); }

.mt { margin-top: 1.25rem; }

/* labeled spec rows (IB Gateway ports & setup) */
.spec { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.5rem; }
.spec li {
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.55rem 0.85rem;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 0.55rem;
  font-size: 0.93rem;
  color: var(--muted);
}
.spec .k { color: var(--text); font-weight: 600; }

/* structure glossary */
.defs { margin: 1.5rem 0 0; }
.defs dt { font-weight: 700; color: var(--gold); margin-top: 0.9rem; }
.defs dt:first-child { margin-top: 0; }
.defs dd { margin: 0.2rem 0 0; color: var(--muted); font-size: 0.95rem; max-width: 64ch; }

@media (max-width: 720px) {
  .spec li { grid-template-columns: 1fr; gap: 0.15rem; }
}

/* structure chips */
.structures { grid-template-columns: repeat(3, 1fr); }
.chip {
  text-align: center;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  padding: 0.8rem 0.6rem;
  font-weight: 600;
  color: var(--gold);
}

/* ---- payoff figures ----------------------------------------------------- */
.payoff {
  margin: 2rem 0 0;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  padding: 1rem;
}
.payoff svg { width: 100%; height: auto; display: block; }
.payoff figcaption {
  margin-top: 0.6rem;
  font-size: 0.85rem;
  color: var(--faint);
  text-align: center;
}

svg .axis { stroke: var(--border); stroke-width: 1.5; }
svg .grid { stroke: var(--border); stroke-dasharray: 3 4; stroke-width: 1; }
svg .line { fill: none; stroke: var(--green); stroke-width: 2.5; stroke-linejoin: round; }
svg .profit { fill: color-mix(in srgb, var(--green) 18%, transparent); }
svg .loss { fill: var(--loss); }
svg .cap { fill: var(--green-soft); font-size: 11px; font-family: ui-monospace, monospace; }
svg .lbl { fill: var(--faint); font-size: 11px; font-family: ui-monospace, monospace; }

/* ---- closing / footer --------------------------------------------------- */
.closing .cta { margin-top: 1.75rem; }

footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3.5rem;
  border-top: 1px solid var(--border);
  color: var(--faint);
  font-size: 0.9rem;
}
footer p { margin: 0 0 0.6rem; }
.disclaimer { max-width: 70ch; }

/* ---- responsive --------------------------------------------------------- */
@media (max-width: 720px) {
  .grid.two, .grid.three, .structures { grid-template-columns: 1fr; }
  .nav { margin-bottom: 2.5rem; }
}