/* TalCash: security-paper palette, one day of blocks as the signature. */

:root {
  --paper: #edf1ee;      /* cool banknote paper */
  --panel: #e1e8e4;
  --ink: #14262b;        /* text */
  --ink-soft: #4a5e63;
  --teal: #0f5c5e;       /* intaglio ink: blocks already found */
  --red: #c23a2b;        /* serial-number red: the current block */
  --cell: #d3ddd9;       /* blocks still to come */
  --rule: #c5d0cb;

  --mono: ui-monospace, "Cascadia Mono", "Cascadia Code", "SF Mono", "JetBrains Mono", Menlo, Consolas,
    "DejaVu Sans Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --page: min(1120px, 100% - 2 * clamp(16px, 4vw, 40px));
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0d1a1d;
    --panel: #132529;
    --ink: #e3ebe7;
    --ink-soft: #9cb0ab;
    --teal: #4fb8ae;
    --red: #ff6a55;
    --cell: #1d3337;
    --rule: #24393d;
    color-scheme: dark;
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--sans);
  -webkit-text-size-adjust: 100%;
}

a {
  color: var(--teal);
  text-underline-offset: 0.18em;
}

a:focus-visible,
.button:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip {
  position: absolute;
  left: -999px;
  top: 8px;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--paper);
}

.skip:focus {
  left: 8px;
  z-index: 10;
}

/* --- notice and header ------------------------------------------------------ */

.notice {
  margin: 0;
  padding: 10px 16px;
  background: var(--ink);
  color: var(--paper);
  font: 400 0.8125rem/1.5 var(--mono);
  text-align: center;
  text-wrap: balance;
}

.top {
  width: var(--page);
  margin: 0 auto;
  padding: 22px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px 24px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font: 700 1.25rem/1 var(--mono);
  letter-spacing: -0.03em;
}

.mark {
  width: 22px;
  height: 22px;
}

.mark .past {
  fill: var(--teal);
}

.mark .now {
  fill: var(--red);
}

.mark .later {
  fill: var(--cell);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 22px;
  font: 500 0.9375rem/1.4 var(--sans);
}

.nav a {
  color: var(--ink);
  text-decoration: none;
}

.nav a:hover {
  color: var(--teal);
  text-decoration: underline;
}

/* --- hero --------------------------------------------------------------------- */

main {
  width: var(--page);
  margin: 0 auto;
}

.hero {
  display: grid;
  gap: clamp(36px, 6vw, 72px);
  align-items: center;
  padding: clamp(28px, 6vw, 72px) 0 clamp(20px, 4vw, 40px);
}

@media (min-width: 960px) {
  .hero {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  }
}

.eyebrow,
.label {
  margin: 0;
  color: var(--ink-soft);
  font: 500 0.75rem/1.4 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

h1 {
  margin: 14px 0 20px;
  font: 700 clamp(2.25rem, 1.3rem + 3.6vw, 3.6rem)/1.04 var(--mono);
  letter-spacing: -0.045em;
  text-wrap: balance;
}

.lede {
  margin: 0;
  max-width: 34em;
  color: var(--ink-soft);
  font-size: 1.1875rem;
  line-height: 1.55;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-block;
  padding: 11px 18px;
  border: 1.5px solid var(--ink);
  border-radius: 3px;
  color: var(--ink);
  font: 600 0.9375rem/1.2 var(--mono);
  text-decoration: none;
  transition: background-color 0.15s, color 0.15s;
}

.button:hover {
  background: var(--ink);
  color: var(--paper);
}

.button.primary {
  border-color: var(--teal);
  background: var(--teal);
  color: var(--paper);
}

.button.primary:hover {
  border-color: var(--ink);
  background: var(--ink);
}

/* --- today: one day of blocks ---------------------------------------------------- */

.today {
  margin: 0;
  padding: clamp(16px, 2.5vw, 24px);
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 4px;
}

.today-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
}

.count {
  font: 600 0.875rem/1.3 var(--mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.count b {
  color: var(--red);
  font-weight: 700;
}

.today-body {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px;
}

/* Hour labels at rows 0, 6, 12 and 18: a quarter of the grid apart. */
.hours {
  position: relative;
  width: 1.4em;
  color: var(--ink-soft);
  font: 500 0.625rem/1 var(--mono);
}

.hours span {
  position: absolute;
  left: 0;
}

.hours span:nth-child(1) { top: 0; }
.hours span:nth-child(2) { top: 25%; }
.hours span:nth-child(3) { top: 50%; }
.hours span:nth-child(4) { top: 75%; }

.day {
  display: grid;
  grid-template-columns: repeat(60, minmax(0, 1fr));
  gap: 2px;
}

/* Without JavaScript: the same grid, drawn as a pattern. */
.day:empty {
  aspect-ratio: 60 / 24;
  background-color: var(--cell);
  background-image:
    linear-gradient(to right, var(--panel) 2px, transparent 2px),
    linear-gradient(to bottom, var(--panel) 2px, transparent 2px);
  background-size: calc(100% / 60) calc(100% / 24);
}

.day i {
  display: block;
  aspect-ratio: 1;
  border-radius: 1px;
  background: var(--cell);
}

.day i.past {
  background: var(--teal);
}

.day i.now {
  background: var(--red);
  animation: blink 1.6s ease-in-out infinite;
}

@keyframes blink {
  50% {
    opacity: 0.3;
  }
}

.today figcaption {
  margin-top: 14px;
  color: var(--ink-soft);
  font-size: 0.875rem;
  line-height: 1.5;
}

/* Phones: 40 minutes per row instead of 60, so the squares stay visible.
   36 rows still put 06:00, 12:00 and 18:00 exactly a quarter of the way down each. */
@media (max-width: 600px) {
  .day {
    grid-template-columns: repeat(40, minmax(0, 1fr));
    gap: 1.5px;
  }

  .day:empty {
    aspect-ratio: 40 / 36;
    background-size: calc(100% / 40) calc(100% / 36);
  }

  .notice-more {
    display: none;
  }
}

/* --- sections -------------------------------------------------------------------- */

.block {
  padding: clamp(48px, 8vw, 88px) 0 0;
}

h2 {
  margin: 0 0 28px;
  font: 700 clamp(1.5rem, 1.1rem + 1.4vw, 2rem)/1.15 var(--mono);
  letter-spacing: -0.035em;
}

/* the numbers: a ledger with dotted leaders */

.ledger dl {
  display: grid;
  gap: 0 56px;
  margin: 0;
  border-top: 1.5px solid var(--ink);
}

@media (min-width: 760px) {
  .ledger dl {
    grid-template-columns: 1fr 1fr;
    grid-auto-flow: column;
    grid-template-rows: repeat(5, auto);
  }
}

.ledger dl {
  padding: 8px 0;
  border-bottom: 1px solid var(--rule);
}

.ledger dl div {
  display: flex;
  align-items: baseline;
  padding: 9px 0;
}

.ledger dt {
  display: flex;
  flex: 1;
  align-items: baseline;
  gap: 10px;
  color: var(--ink-soft);
  font-size: 0.9375rem;
}

.ledger dt::after {
  content: "";
  flex: 1;
  min-width: 24px;
  margin-right: 10px;
  border-bottom: 2px dotted var(--rule);
}

.ledger dd {
  margin: 0;
  font: 600 0.9375rem/1.4 var(--mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

/* how it works */

.points {
  display: grid;
  gap: 36px 56px;
}

@media (min-width: 760px) {
  .points {
    grid-template-columns: 1fr 1fr;
  }
}

.point h3 {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 8px;
  font: 650 1.125rem/1.35 var(--sans);
}

.point h3::before {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 1px;
  background: var(--teal);
  transform: translateY(-1px);
}

.point p {
  margin: 0;
  color: var(--ink-soft);
}

/* join the testnet */

.intro {
  max-width: 40em;
  margin: -12px 0 28px;
  color: var(--ink-soft);
}

.steps {
  display: grid;
  gap: 22px;
  max-width: 46em;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.steps li {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr);
  counter-increment: step;
}

.steps li::before {
  content: counter(step);
  grid-row: 1 / span 3;
  color: var(--teal);
  font: 700 1.125rem/1.5 var(--mono);
}

.step-title {
  margin: 0 0 8px;
  font-weight: 600;
}

.steps pre {
  margin: 0;
  padding: 12px 16px;
  overflow-x: auto;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--teal);
  border-radius: 3px;
  font: 400 0.9rem/1.6 var(--mono);
}

.step-note {
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 0.9375rem;
}

.after-steps {
  max-width: 46em;
  margin: 30px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  color: var(--ink-soft);
}

.after-steps code {
  color: var(--ink);
  font: 400 0.9em var(--mono);
  overflow-wrap: anywhere;
}

/* roadmap: the same three states as the day grid */

.road {
  display: grid;
  gap: 0;
  max-width: 40em;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1.5px solid var(--ink);
}

.road li {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--rule);
}

.road li::before {
  content: "";
  flex: none;
  width: 11px;
  height: 11px;
  border-radius: 1px;
  background: var(--cell);
}

.road .done {
  color: var(--ink-soft);
}

.road .done::before {
  background: var(--teal);
}

.road .now {
  font-weight: 650;
}

.road .now::before {
  background: var(--red);
}

.tag {
  padding: 2px 7px;
  border: 1px solid var(--red);
  border-radius: 3px;
  color: var(--red);
  font: 600 0.6875rem/1.4 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* 404 page */

.missing {
  padding: 18vh 0;
}

/* --- footer -------------------------------------------------------------------- */

.foot {
  width: var(--page);
  margin: clamp(64px, 10vw, 112px) auto 0;
  padding: 28px 0 40px;
  border-top: 1.5px solid var(--ink);
  color: var(--ink-soft);
  font-size: 0.875rem;
}

.foot-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-bottom: 12px;
  font-weight: 500;
}

.foot p {
  margin: 0;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .day i.now {
    animation: none;
  }

  .button {
    transition: none;
  }
}