/* YLevels website. Tokens and type follow Brand/README.md (approved 2026-09-13).
   Green and red mean direction only; the brand colour is blue. */

:root {
  --ground: #FFFFFF;
  --panel: #EAF3FB;
  --ink: #101C2B;
  --slate: #5D6B7B;
  --rule: #D3DCE5;
  --accent: #1F7BC0;
  --accent-strong: #17629B;
  --on-accent: #FFFFFF;
  --tag: #1F7BC0;
  --tag-text: #FFFFFF;
  --up: #12A15C;
  --down: #E03A3E;

  --display: "Barlow Semi Condensed", "Arial Narrow", "Roboto Condensed", system-ui, sans-serif;
  --label: "Barlow", system-ui, -apple-system, "Segoe UI", sans-serif;
  --body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;

  --step--1: 0.8125rem;
  --step-0: 1.0625rem;
  --step-1: 1.25rem;
  --step-2: 1.625rem;
  --step-3: clamp(1.875rem, 1.4rem + 1.6vw, 2.5rem);
  --step-4: clamp(2.5rem, 1.55rem + 3.7vw, 4.125rem);

  --gutter: clamp(16px, 4vw, 40px);
  --measure: 65ch;
  --radius: 10px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground: #0C1520;
    --panel: #142231;
    --ink: #E4ECF3;
    --slate: #9AAAB9;
    --rule: #26384A;
    --accent: #6CB9EC;
    --accent-strong: #8FCBF2;
    --on-accent: #0C1520;
    --tag: #6CB9EC;
    --tag-text: #0C1520;
    --up: #3CCB84;
    --down: #FF6B6E;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --ground: #0C1520;
  --panel: #142231;
  --ink: #E4ECF3;
  --slate: #9AAAB9;
  --rule: #26384A;
  --accent: #6CB9EC;
  --accent-strong: #8FCBF2;
  --on-accent: #0C1520;
  --tag: #6CB9EC;
  --tag-text: #0C1520;
  --up: #3CCB84;
  --down: #FF6B6E;
  color-scheme: dark;
}

/* Base */

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

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

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font: 400 var(--step-0)/1.6 var(--body);
}

img, svg { display: block; max-width: 100%; height: auto; }

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}
a:hover { color: var(--accent-strong); }

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

h1, h2, h3 {
  margin: 0;
  color: var(--ink);
  font-family: var(--display);
  text-wrap: balance;
}
h1 { font-size: var(--step-4); font-weight: 800; line-height: 1.02; }
h2 { font-size: var(--step-3); font-weight: 700; line-height: 1.08; }
h3 { font-size: var(--step-2); font-weight: 700; line-height: 1.15; }

p, ol, ul, dl, figure { margin: 0; }
strong { font-weight: 600; }

.wrap {
  width: 100%;
  max-width: calc(72rem + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: var(--gutter);
  top: 8px;
  z-index: 10;
  padding: 0.5rem 0.75rem;
  background: var(--ground);
}

.eyebrow {
  color: var(--slate);
  font: 600 var(--step--1)/1.3 var(--label);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.lead {
  max-width: 38rem;
  font-size: var(--step-1);
  line-height: 1.55;
}

.prose {
  display: grid;
  gap: 1rem;
  max-width: var(--measure);
}

.note {
  max-width: 46rem;
  color: var(--slate);
  font-size: var(--step--1);
  line-height: 1.55;
}

.fig-caption {
  color: var(--slate);
  font: 400 var(--step--1)/1.5 var(--mono);
}

.pending {
  display: inline-block;
  padding: 0.5rem 0.7rem;
  border: 1px dashed var(--slate);
  border-radius: 8px;
  color: var(--slate);
  font: 500 var(--step--1)/1.3 var(--mono);
}

.preview-note {
  padding-block: 0.6rem;
  border-bottom: 1px solid var(--rule);
  color: var(--slate);
  font: 500 var(--step--1)/1.4 var(--mono);
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.65rem 1.1rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font: 600 1rem/1.1 var(--label);
  text-decoration: none;
  cursor: pointer;
}
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-strong); color: var(--on-accent); }
.btn-quiet { background: transparent; border-color: var(--rule); color: var(--ink); }
.btn-quiet:hover { border-color: var(--slate); color: var(--ink); }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

/* Wordmark: "Y" on a filled tag, then "Levels" */

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.08em;
  color: var(--ink);
  font: 700 1.75rem/1 var(--display);
  text-decoration: none;
}
.wordmark:hover { color: var(--ink); }
.wm-tag {
  padding: 0.1em 0.18em 0.06em;
  border-radius: 0.14em;
  background: var(--tag);
  color: var(--tag-text);
}
.wordmark-sm { font-size: 1.375rem; }

/* Header */

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

.bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-block: 14px;
}

.nav {
  display: flex;
  gap: clamp(1rem, 3vw, 2rem);
  font: 600 1rem/1 var(--label);
}
.nav a {
  padding-block: 0.55rem;
  border-bottom: 2px solid transparent;
  color: var(--ink);
  text-decoration: none;
}
.nav a:hover { border-bottom-color: var(--rule); color: var(--ink); }
.nav a[aria-current="page"] { border-bottom-color: var(--accent); }

/* Hero: statement on the ground, the level ladder on a full-bleed panel */

.hero {
  display: grid;
  grid-template-columns:
    minmax(var(--gutter), 1fr)
    minmax(0, 38rem)
    minmax(0, 34rem)
    minmax(var(--gutter), 1fr);
}

.hero-copy {
  grid-column: 2;
  display: grid;
  align-content: center;
  gap: 1.25rem;
  padding-block: clamp(2.5rem, 6vw, 5.5rem);
  padding-right: clamp(1.5rem, 4vw, 3.5rem);
}

.hero-figure {
  grid-column: 3 / 5;
  display: grid;
  align-content: center;
  gap: 1rem;
  padding: clamp(2rem, 4vw, 3.5rem) var(--gutter) clamp(1.5rem, 3vw, 2.5rem) clamp(1.5rem, 3.5vw, 3rem);
  background: var(--panel);
}
.hero-figure .ladder { width: 100%; max-width: 31rem; }
.hero-figure .fig-caption { max-width: 31rem; }

@media (max-width: 860px) {
  .hero { grid-template-columns: var(--gutter) minmax(0, 1fr) var(--gutter); }
  .hero-copy { padding-right: 0; }
  .hero-figure { grid-column: 1 / -1; padding-inline: var(--gutter); }
}

/* The ladder SVG, drawn with the alert cards' geometry */

.ladder text {
  fill: var(--slate);
  font-family: var(--label);
  font-size: 22px;
  font-weight: 500;
}
.ladder .lbl-open { font-weight: 600; letter-spacing: 1.5px; }
.ladder .lbl-hit { fill: var(--up); font-weight: 600; }
.ladder .rung { stroke: var(--rule); stroke-width: 2; }
.ladder .open { stroke: var(--slate); stroke-width: 3; stroke-dasharray: 14 10; }
.ladder .hit { stroke: var(--up); stroke-width: 5; }
.ladder .path {
  fill: none;
  stroke: var(--up);
  stroke-width: 5;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.ladder .ring { fill: var(--panel); }
.ladder .dot { fill: var(--up); }
.ladder .pulse {
  fill: none;
  stroke: var(--up);
  stroke-width: 3;
  opacity: 0;
  transform-box: fill-box;
  transform-origin: center;
}

@media (prefers-reduced-motion: no-preference) {
  .ladder .pulse { animation: pulse 1.8s ease-out 0.6s 2; }
}

@keyframes pulse {
  from { opacity: 0.55; transform: scale(1); }
  to { opacity: 0; transform: scale(2.6); }
}

/* Sections */

.section { padding-block: clamp(3rem, 7vw, 5.5rem); }
.section + .section { border-top: 1px solid var(--rule); }

.section-head {
  display: grid;
  gap: 0.75rem;
  max-width: 44rem;
}

/* How alerts work */

.how {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  align-items: start;
  gap: clamp(2rem, 5vw, 4rem);
}

.levels {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 0.85rem;
  margin-block: 0.25rem 0.5rem;
  font: 700 clamp(1.5rem, 1.1rem + 1.4vw, 2.125rem)/1 var(--display);
  font-variant-numeric: tabular-nums;
}
.levels .dn { color: var(--down); }
.levels .up { color: var(--up); }
.levels .at-open { color: var(--slate); letter-spacing: 0.06em; }

.card-figure { display: grid; gap: 0.75rem; }
.card-figure img { border: 1px solid var(--rule); border-radius: 6px; }

@media (max-width: 860px) {
  .how { grid-template-columns: 1fr; }
}

/* A trading day in Eastern Time: a list on phones, a proportional rail on wider screens */

.day {
  display: grid;
  gap: 1.25rem;
  margin-top: clamp(2.5rem, 6vw, 4rem);
}

.day-list {
  display: grid;
  padding: 0;
  border-left: 2px solid var(--rule);
  list-style: none;
}

.ev {
  position: relative;
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  column-gap: 0.75rem;
  padding: 0.55rem 0 0.55rem 1rem;
}
.ev::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 1.05rem;
  width: 12px;
  height: 12px;
  border-radius: 3px;
  background: var(--accent);
}
.ev-alert::before { border-radius: 50%; background: var(--up); }
.ev .t { grid-row: span 2; font: 500 var(--step-0)/1.45 var(--mono); font-variant-numeric: tabular-nums; }
.ev .n { font: 600 var(--step-0)/1.4 var(--label); }
.ev-alert .n { color: var(--up); }
.ev .d { color: var(--slate); font-size: var(--step--1); line-height: 1.45; }

.ticks { display: none; }

/* The proportional rail needs room: below 960px the three update labels would collide. */
@media (min-width: 960px) {
  .day-track {
    --rail: 8rem;
    position: relative;
    height: 12.5rem;
    margin-inline: 0.5rem;
  }
  .day-track::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: var(--rail);
    height: 2px;
    background: var(--rule);
  }
  .ticks { display: block; position: absolute; inset: 0; }
  .tick {
    position: absolute;
    left: var(--at);
    top: calc(var(--rail) - 4px);
    width: 2px;
    height: 10px;
    background: var(--rule);
  }
  .day-list { position: absolute; inset: 0; border-left: 0; }
  .ev {
    position: absolute;
    left: var(--at);
    z-index: 1;
    display: block;
    width: 11rem;
    padding: 0;
    text-align: center;
    transform: translateX(-50%);
  }
  .ev > span { display: block; }
  .ev::before { left: 50%; transform: translateX(-50%); }
  .ev-update { bottom: calc(100% - var(--rail) + 1rem); }
  .ev-update::before { top: auto; bottom: calc(-1rem - 7px); }
  .ev-alert { top: calc(var(--rail) + 1rem); width: 5.5rem; }
  .ev-alert::before { top: calc(-1rem - 5px); }
  .ev-start { text-align: left; transform: none; }
  .ev-start::before { left: 0; }
  .ev-end { text-align: right; transform: translateX(-100%); }
  .ev-end::before { left: 100%; }
}

/* Channel board */

.board-top {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 1.25rem 2rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.25rem);
}

.board {
  padding: 0;
  border-bottom: 1px solid var(--rule);
  list-style: none;
}

.row {
  display: grid;
  grid-template-columns: 5.5rem minmax(0, 1fr) minmax(0, 12.5rem) 9.75rem 10.5rem;
  grid-template-areas: "tk co handle state act";
  align-items: center;
  gap: 0.5rem 1.25rem;
  padding-block: 0.95rem;
  border-top: 1px solid var(--rule);
}
.tk { grid-area: tk; font: 700 1.625rem/1 var(--display); letter-spacing: 0.01em; }
.co { grid-area: co; font: 500 var(--step-0)/1.35 var(--label); }
.handle {
  grid-area: handle;
  overflow-wrap: anywhere;
  color: var(--slate);
  font: 400 0.9375rem/1.3 var(--mono);
}
.state {
  grid-area: state;
  justify-self: start;
  padding: 0.45rem 0.6rem;
  border-radius: 8px;
  background: var(--panel);
  color: var(--slate);
  font: 600 var(--step--1)/1 var(--label);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}
.state-live { background: var(--accent); color: var(--on-accent); }
.act { grid-area: act; justify-self: end; }

/* Five fixed columns need about 900px; below that each row stacks on two lines. */
@media (max-width: 900px) {
  .row {
    grid-template-columns: auto minmax(0, 1fr) auto;
    grid-template-areas:
      "tk co state"
      "handle handle act";
    row-gap: 0.6rem;
  }
  .state { justify-self: end; }
}

.below-board { margin-top: 1rem; }

/* Support band on the home page */

.band { background: var(--panel); }
.band-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem 2rem;
  padding-block: clamp(2rem, 5vw, 3rem);
}
.band-inner p { max-width: 42rem; font-size: var(--step-1); line-height: 1.5; }

/* Inner pages */

.page-head {
  display: grid;
  gap: 1rem;
  max-width: 46rem;
  padding-block: clamp(2.5rem, 6vw, 4.5rem) clamp(1.75rem, 4vw, 2.75rem);
}

.doc {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.5rem);
  padding-bottom: clamp(3rem, 7vw, 5rem);
}

.doc-item {
  display: grid;
  grid-template-columns: minmax(0, 15rem) minmax(0, 1fr);
  gap: 0.75rem 2.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--rule);
}
.doc-item h2 { font-size: var(--step-2); line-height: 1.15; }
.doc-item ol { display: grid; gap: 0.5rem; padding-left: 1.25rem; }

@media (max-width: 760px) {
  .doc-item { grid-template-columns: 1fr; }
}

.schedule {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 0.9rem 1.5rem;
}
.schedule dt { font: 500 var(--step-0)/1.6 var(--mono); font-variant-numeric: tabular-nums; }
.schedule dd { margin: 0; }
.schedule b { font-family: var(--label); font-weight: 600; }

@media (max-width: 480px) {
  .schedule { grid-template-columns: 1fr; gap: 0.15rem; }
  .schedule dd { margin-bottom: 0.75rem; }
}

/* Support methods */

.methods { padding: 0; list-style: none; }

.method {
  display: grid;
  grid-template-columns: minmax(0, 15rem) minmax(0, 1fr) auto;
  align-items: start;
  gap: 0.75rem 2.5rem;
  padding-block: 1.75rem;
  border-top: 1px solid var(--rule);
}
.method:last-child { border-bottom: 1px solid var(--rule); }
.method h2 { font-size: var(--step-2); line-height: 1.15; }
.method-body { display: grid; gap: 0.6rem; max-width: 36rem; }
.method-body .sub { color: var(--slate); font-size: var(--step--1); }

.addr {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}
.addr code {
  padding: 0.55rem 0.7rem;
  border-radius: 8px;
  background: var(--panel);
  overflow-wrap: anywhere;
  font: 500 0.9375rem/1.4 var(--mono);
}

@media (max-width: 860px) {
  .method { grid-template-columns: 1fr; }
}

.notes {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.75rem;
  padding-bottom: clamp(3rem, 7vw, 5rem);
}

/* Footer */

.site-footer {
  padding-block: 2.5rem 3rem;
  border-top: 1px solid var(--rule);
}

.foot {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: 1.5rem 3rem;
}
.fine {
  display: grid;
  justify-items: start;
  gap: 0.6rem;
  max-width: 40rem;
  color: var(--slate);
  font-size: var(--step--1);
  line-height: 1.55;
}
.credit { font-family: var(--mono); }
.foot-nav {
  display: flex;
  flex-wrap: wrap;
  align-content: start;
  justify-content: end;
  gap: 0.5rem 1.25rem;
  font: 600 0.9375rem/1.4 var(--label);
}
.foot-nav a { color: var(--ink); }

@media (max-width: 720px) {
  .foot { grid-template-columns: 1fr; }
  .foot-nav { justify-content: start; }
}