/* ICM Master landing page. Mobile layout is the default, wider screens add to it. */

:root {
  --bg: #eef1eb;
  --panel: #f7f9f5;
  --ink: #16231d;
  --muted: #4a5a50;
  --rule: #c7d2c5;
  --felt: #1c4b39;
  --felt-soft: #d7e3d8;
  /* The card mat stays dark green in both themes: playing cards are white, and
     white on a light green ground loses the cards' own edges. */
  --table-felt: #1c4b39;
  --table-felt-lit: #2d6f53;
  --brass-line: #b8862a;
  /* Focus is felt green, not brass: brass on the light ground is 2.84:1, under
     the 3:1 minimum for a non-text indicator. */
  --focus: #1c4b39;
  --shade: rgba(184, 134, 42, 0.18);
  --serif: Charter, "Bitstream Charter", "Iowan Old Style", Georgia, "Liberation Serif", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "DejaVu Sans Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c1a15;
    --panel: #12261e;
    --ink: #e6ede4;
    --muted: #a3b6a8;
    --rule: #22402f;
    --felt: #58b98f;
    --felt-soft: #16332a;
    --table-felt: #123527;
    --table-felt-lit: #1d5940;
    --brass-line: #e0ae4c;
    --focus: #e0ae4c;
    --shade: rgba(224, 174, 76, 0.16);
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 17px/1.65 var(--serif);
  overflow-wrap: break-word;
}

a { color: var(--ink); text-decoration-color: var(--brass-line); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }

h1, h2, h3 { font-weight: 600; line-height: 1.2; margin: 0 0 0.6rem; }
h1 { font-size: 2rem; letter-spacing: -0.015em; }
h2 { font-size: 1.45rem; }
h3 { font-size: 1.06rem; }
p { margin: 0 0 1rem; max-width: 34rem; }

.hero, main > section, footer {
  padding: 2.4rem 20px;
  margin: 0 auto;
  max-width: 62rem;
}

/* Hero */

.hero { padding-top: 1.6rem; }

.wordmark {
  font: 600 0.95rem/1 var(--sans);
  letter-spacing: 0.02em;
  color: var(--felt);
  margin: 0 0 1.4rem;
}

.lede { font-size: 1.15rem; color: var(--muted); }

.curve { margin: 1.8rem 0 2rem; }

.curve-svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 34rem;
  background: var(--panel);
  border: 1px solid var(--rule);
  padding: 0.6rem 0.4rem 0;
}

.curve-axes line { stroke: var(--rule); stroke-width: 2; }
.curve-linear { stroke: var(--muted); stroke-width: 2; stroke-dasharray: 5 6; }
.curve-area { fill: var(--shade); }
.curve-icm { fill: none; stroke: var(--brass-line); stroke-width: 4; stroke-linecap: round; }
.curve-label, .curve-axis-label { font: 400 15px/1 var(--sans); fill: var(--muted); }
.curve-label { fill: var(--ink); }

figcaption {
  font-size: 0.95rem;
  color: var(--muted);
  max-width: 34rem;
  margin-top: 0.8rem;
}

/* Screenshots and card art */

.shot { margin: 2.2rem 0 0; }

.shot img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 6px;
}

.shot-table {
  padding: 0.6rem;
  background: var(--felt-soft);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--brass-line);
}

.shot-table figcaption { margin: 0.8rem 0.2rem 0.2rem; }

.shot-panel { max-width: 30rem; }
.shot-panel img { border: 1px solid var(--rule); }

.hand { margin: 2rem 0 0; }

.hand-cards {
  display: flex;
  gap: 0.5rem;
  width: fit-content;
  padding: 0.9rem;
  background: radial-gradient(120% 150% at 28% 0%, var(--table-felt-lit), var(--table-felt) 72%);
  border: 2px solid var(--brass-line);
  border-radius: 12px;
}

.hand-cards img {
  display: block;
  width: 104px;
  height: auto;
  border-radius: 5px;
  box-shadow: 0 2px 7px rgba(0, 0, 0, 0.4);
}

@media (prefers-reduced-motion: no-preference) {
  .js .curve-icm {
    stroke-dasharray: 430;
    stroke-dashoffset: 430;
    animation: trace 1.5s 0.2s ease-out forwards;
  }
  .js .curve-area { opacity: 0; animation: settle 0.9s 1.3s ease-out forwards; }
  @keyframes trace { to { stroke-dashoffset: 0; } }
  @keyframes settle { to { opacity: 1; } }
}

/* Calls to action */

.ctas { list-style: none; margin: 0; padding: 0; }
.ctas > li { margin-bottom: 1.4rem; }

.cta {
  display: inline-block;
  min-height: 44px;
  padding: 0.7rem 1.2rem;
  font: 600 1rem/1.6 var(--sans);
  text-decoration: none;
  border: 2px solid var(--felt);
}

.cta-primary { background: var(--felt); color: var(--bg); }
.cta-primary:hover { background: transparent; color: var(--ink); }
.cta-secondary { color: var(--ink); }
.cta-secondary:hover { background: var(--felt-soft); }

.honesty {
  font-size: 0.95rem;
  color: var(--muted);
  margin: 0.7rem 0 0;
  padding-left: 0.8rem;
  border-left: 3px solid var(--brass-line);
  max-width: 30rem;
}

/* Sections */

main > section { border-top: 1px solid var(--rule); }
main > section > h2 { max-width: 30rem; }

.features { list-style: none; margin: 1.6rem 0 0; padding: 0; }
.features > li { padding: 1.1rem 0; border-top: 1px solid var(--rule); }
.features h3 { color: var(--felt); }
.features p { margin: 0; color: var(--muted); }

.terms { margin: 1.6rem 0 0; }
.terms dt {
  font: 600 1.06rem/1.3 var(--serif);
  padding-top: 1.2rem;
  border-top: 1px solid var(--rule);
  margin-bottom: 0.6rem;
}
.terms dd { margin: 0 0 0.7rem; max-width: 34rem; color: var(--muted); }
.terms dd[data-field="definition"] { color: var(--ink); }
.terms dd[data-field="example"] {
  font-size: 0.95rem;
  padding-left: 0.8rem;
  border-left: 3px solid var(--felt-soft);
  padding-bottom: 0.9rem;
}

#quickstart h3 { margin-top: 1.6rem; }
#quickstart ul { color: var(--muted); padding-left: 1.2rem; }

.steps { margin: 0; padding-left: 1.4rem; }
.steps > li { margin-bottom: 1.1rem; }
.step-label { display: block; font: 600 1rem/1.4 var(--sans); }

code {
  display: block;
  margin-top: 0.4rem;
  padding: 0.6rem 0.7rem;
  background: var(--panel);
  border: 1px solid var(--rule);
  font: 400 0.95rem/1.5 var(--mono);
  overflow-x: auto;
}

[data-note] { font-size: 0.95rem; color: var(--muted); }

footer {
  border-top: 1px solid var(--rule);
  color: var(--muted);
  padding-bottom: 3rem;
}
footer p { margin-bottom: 0.4rem; }
footer .small { font-size: 0.95rem; }

@media (min-width: 40em) {
  body { font-size: 18px; }
  h1 { font-size: 2.6rem; }
  h2 { font-size: 1.8rem; }
  .hero, main > section, footer { padding: 3.2rem 2.5rem; }
  .ctas { display: flex; flex-wrap: wrap; gap: 1.5rem 2rem; align-items: start; }
  .ctas > li { flex: 1 1 18rem; margin-bottom: 0; }
  .features { display: grid; grid-template-columns: 1fr 1fr; gap: 0 2.5rem; }
  .hand-cards img { width: 128px; }
}

@media (min-width: 60em) {
  h1 { font-size: 3.1rem; max-width: 16ch; }
  .hero { display: grid; grid-template-columns: 1fr 1fr; gap: 0 3rem; align-items: end; }
  .wordmark, .hero > nav, .hero > .shot-table { grid-column: 1 / -1; }
  .curve { margin: 0; grid-column: 2; grid-row: 2 / span 2; }
  .curve-svg { max-width: none; }
  .lede { align-self: start; }
  .features-lead { display: grid; grid-template-columns: 1fr 30rem; gap: 0 2.5rem; align-items: start; }
  .features-lead .shot-panel { margin-top: 0; }
  .terms { display: grid; grid-template-columns: 14rem 1fr; column-gap: 2.5rem; }
  .terms dt { grid-column: 1; margin-bottom: 0; }
  .terms dd { grid-column: 2; }
  .terms dd[data-field="definition"] { border-top: 1px solid var(--rule); padding-top: 1.2rem; }
}