/* Study planner styles. Visual direction: "Lab instrument" (design/README.md).
   Color roles are tokens; the light theme swaps the same roles. */

:root {
  --bg: #0E1214;
  --surface: #161C1F;
  --line: #2A3337;
  --text: #E3E8E6;
  --text-2: #9AA6A3;
  --accent: #4FD1C5;
  --accent-hover: #7FE3D9;
  --selected: #173B38;
  --warn: #F2B84B;
  --warn-bg: #2E2615;
  --control: #6E7D80;
  --on-accent: #0E1214;
  --shade-opacity: 0.28;
  --sans: 'IBM Plex Sans', ui-sans-serif, system-ui, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #F3F5F4;
  --surface: #FFFFFF;
  --line: #DCE2E0;
  --text: #14191B;
  --text-2: #4F5B5E;
  --accent: #0F766E;
  --accent-hover: #0F766E;
  --selected: #E2F3F0;
  --warn: #8A5300;
  --warn-bg: #FBF1DC;
  --control: #7A8A8C;
  --on-accent: #FFFFFF;
  --shade-opacity: 0.28;
  color-scheme: light;
}

* { box-sizing: border-box; }

html { background: var(--bg); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.4;
}

a { color: var(--accent); }
a:hover { color: var(--accent-hover); }
:root[data-theme="light"] a:hover { text-decoration-thickness: 2px; }

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

h1:focus, h2:focus { outline: none; }
h1:focus-visible, h2:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }

button { font: inherit; color: var(--text); cursor: pointer; }
input, select { font: inherit; color: var(--text); background: var(--bg); }
input::placeholder { color: var(--text-2); opacity: 1; }
input[type="range"] { accent-color: var(--accent); }

.mono { font-family: var(--mono); }
.secondary { color: var(--text-2); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Full-height page: header, the screen, then the footer. The screen grows to
   fill the window, so the footer sits at the bottom when content is short and
   follows the content when it is long. */
#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
}
#app > .header,
#app > .site-footer { flex: none; }
#app > :not(.header):not(.site-footer) {
  flex: 1 0 auto;
  width: 100%;
}

/* Header and step navigation */

.header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 32px;
  border-bottom: 1px solid var(--control);
  background: var(--surface);
}

.header-end { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; }

.brand {
  font-weight: 600;
  font-size: 18px;
  color: var(--text);
  text-decoration: none;
}
a.brand:hover { color: var(--text); text-decoration: underline; }

.header-note { font-size: 14px; color: var(--text-2); }

.steps { display: flex; flex-wrap: wrap; gap: 8px; font-size: 14px; }
.steps ol { display: contents; list-style: none; }
.steps li { display: flex; }

.pill {
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--control);
  color: var(--text-2);
  text-decoration: none;
}
a.pill { border-color: var(--text); color: var(--text); }
a.pill:hover { color: var(--text); background: var(--selected); }
.pill.current { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }

/* Theme toggle: a small, quiet round icon button. The icon uses the
   secondary text color (at least 3:1 against the header in both themes). */
.theme-toggle {
  width: 40px;
  height: 40px;
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: transparent;
  color: var(--text-2);
}
.theme-toggle:hover { color: var(--text); border-color: var(--control); }

/* Footer on every screen */
.site-footer { border-top: 1px solid var(--line); margin-top: 8px; }
.footer-inner {
  padding: 20px 32px 32px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px 32px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-2);
}
.footer-col { display: flex; flex-direction: column; gap: 2px; }
.footer-end { text-align: right; align-items: flex-end; }
.footer-name { font-weight: 600; color: var(--text); }
.footer-person { color: var(--text); }
.footer-dot { margin: 0 6px; }
.site-footer a { color: var(--accent); }
@media (max-width: 640px) {
  .footer-inner { flex-direction: column; }
  .footer-end { text-align: left; align-items: flex-start; }
}

/* Page layout */

.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 32px 48px;
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  align-items: flex-start;
}

.main {
  flex: 999 1 560px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.intro { display: flex; flex-direction: column; gap: 8px; }
.intro h1 { margin: 0; font-size: 32px; font-weight: 600; line-height: 1.2; }
.intro p { margin: 0; font-size: 16px; color: var(--text-2); }

/* Cards and sections */

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.card.focus-card { border: 2px solid var(--text); }
.card.square { border-radius: 4px; padding: 28px; }

.card-title { margin: 0; font-size: 18px; font-weight: 600; }
.card h2.card-title { font-size: 18px; }
.section-title { margin: 0; font-size: 20px; font-weight: 600; }

.hint { margin: 0; font-size: 14px; color: var(--text-2); }
.small-hint { font-size: 13px; color: var(--text-2); }

.label-caps {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-2);
}

.step1-card { gap: 20px; }
.factor-block { display: flex; flex-direction: column; gap: 16px; }
.divider { border: none; border-top: 1px solid var(--line); margin: 4px 0; width: 100%; }
.soft-note { margin: 0; font-size: 14px; line-height: 1.5; color: var(--text-2); }
.soft-note:empty { display: none; }

/* Alpha tooltips: shown on hover and on keyboard focus */
.tip {
  position: relative;
  text-decoration: underline dotted;
  text-underline-offset: 3px;
  cursor: help;
  border-radius: 2px;
}
.tip-text {
  display: none;
  position: absolute;
  left: 0;
  bottom: calc(100% + 8px);
  z-index: 20;
  width: max-content;
  max-width: min(320px, 80vw);
  padding: 10px 12px;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--control);
  border-radius: 6px;
  font: 400 13px/1.45 var(--sans);
  letter-spacing: normal;
  text-transform: none;
  text-align: left;
  white-space: normal;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}
.tip-end .tip-text { left: auto; right: 0; }
.tip:hover .tip-text,
.tip:focus .tip-text { display: block; }
.tip.tip-dismissed .tip-text { display: none; }

.note-box {
  font-size: 14px;
  color: var(--text-2);
  padding: 12px;
  border: 1px dashed var(--control);
  border-radius: 8px;
}

.inset {
  padding: 16px;
  border-radius: 10px;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Fields */

.field { display: flex; flex-direction: column; gap: 6px; font-size: 14px; font-weight: 500; }
.field.large { font-size: 16px; }
.field .field-hint { font-size: 14px; font-weight: 400; color: var(--text-2); }
.field-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.field-row .after { font-size: 16px; font-weight: 400; }

.text-input {
  height: 44px;
  padding: 0 12px;
  border: 1px solid var(--control);
  border-radius: 8px;
  font-size: 16px;
  font-weight: 400;
  background: var(--bg);
  width: 100%;
}
.inset .text-input { background: var(--surface); }
.text-input.number { font-family: var(--mono); }
.text-input.w-80 { width: 80px; }
.text-input.w-100 { width: 100px; }
.text-input.w-120 { width: 120px; }
.text-input[aria-invalid="true"] { border: 2px solid var(--warn); }

select.text-input { width: auto; min-width: 200px; }

.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.level-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 8px; }
.level-cell { display: flex; flex-direction: column; gap: 4px; }
.level-wrap { display: flex; gap: 6px; }
.level-wrap .text-input { flex: 1; min-width: 0; }

.error {
  margin: 0;
  font-size: 14px;
  font-weight: 500;
  color: var(--warn);
}
.error::before { content: "\26A0\FE0E  "; }

/* Option buttons (aria-pressed) */

.opt-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; }
.opt-grid.wide { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

.opt {
  text-align: left;
  padding: 16px;
  min-height: 44px;
  border: 1px solid var(--control);
  border-radius: 10px;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.opt .opt-title { font-size: 16px; font-weight: 600; color: var(--text); }
.opt .opt-sub { font-size: 14px; color: var(--text-2); line-height: 1.4; }
.opt[aria-pressed="true"] { border: 2px solid var(--accent); background: var(--selected); padding: 15px; }
.opt:hover:not([aria-disabled="true"]) { border-color: var(--accent); }

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }

.chip {
  height: 44px;
  padding: 0 16px;
  border-radius: 8px;
  border: 1px solid var(--control);
  background: var(--surface);
  font-size: 15px;
}
.chip[aria-pressed="true"] { border: 2px solid var(--accent); background: var(--selected); padding: 0 15px; }
.chip:hover:not([aria-disabled="true"]) { border-color: var(--accent); }
.chip.round { border-radius: 999px; font-size: 14px; padding: 0 14px; }
.chip.round[aria-pressed="true"] { padding: 0 13px; }
.chip.tall { height: auto; min-height: 44px; padding: 10px 16px; text-align: left; }
.chip.tall[aria-pressed="true"] { padding: 9px 15px; }

[aria-disabled="true"].chip,
[aria-disabled="true"].opt {
  border: 1px dashed var(--control);
  background: transparent;
  color: var(--text-2);
  cursor: not-allowed;
}
.disabled-why { font-size: 13px; color: var(--text-2); margin: 0; }

.dashed-btn {
  height: 44px;
  border: 1.5px dashed var(--control);
  border-radius: 8px;
  background: transparent;
  font-size: 15px;
  color: var(--text-2);
  padding: 0 16px;
}
.dashed-btn.block { height: 52px; border-radius: 12px; }
.dashed-btn:hover { color: var(--text); border-color: var(--text); }

.icon-btn {
  width: 44px;
  height: 44px;
  flex: none;
  border: 1px solid var(--control);
  border-radius: 8px;
  background: transparent;
  color: var(--text-2);
  font-size: 18px;
}
.icon-btn:hover { color: var(--text); border-color: var(--text); }

.small-btn {
  height: 40px;
  padding: 0 14px;
  border: 1px solid var(--control);
  border-radius: 8px;
  background: var(--surface);
  font-size: 14px;
}
.small-btn:hover { border-color: var(--text); }

.primary-toggle {
  height: 36px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--control);
  background: var(--surface);
  font-size: 14px;
  font-weight: 500;
}
.primary-toggle[aria-pressed="true"] { border: 2px solid var(--accent); background: var(--selected); padding: 0 13px; }

.check { display: flex; align-items: center; gap: 10px; font-size: 15px; min-height: 44px; }
.check input { width: 20px; height: 20px; accent-color: var(--accent); }

.badge {
  font-size: 12px;
  font-weight: 500;
  padding: 2px 8px;
  border: 1px solid var(--control);
  border-radius: 999px;
  margin-left: 6px;
}

/* Navigation buttons */

.nav-row { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  height: 48px;
  padding: 0 20px;
  border: 1px solid var(--control);
  border-radius: 8px;
  text-decoration: none;
  color: var(--text);
  background: transparent;
  font-size: 16px;
}
a.btn:hover { color: var(--text); background: var(--selected); }
button.btn:hover { background: var(--selected); }
.btn.primary {
  padding: 0 24px;
  border-color: var(--accent);
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 500;
}
.btn.primary:hover { background: var(--accent-hover); color: var(--on-accent); }
.square .btn, .btn.square-btn { border-radius: 4px; }

.link-btn {
  align-self: flex-start;
  padding: 0;
  border: none;
  background: none;
  color: var(--accent);
  font-size: 15px;
  text-decoration: underline;
  min-height: 32px;
}
.link-btn:hover { color: var(--accent-hover); }

/* Sidebar */

.aside {
  flex: 1 1 280px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.aside.result { border-color: var(--accent); gap: 8px; }
.aside-title {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-2);
}
.big-number { font-size: 36px; font-weight: 600; font-family: var(--mono); line-height: 1.2; }
.big-number.xl { font-size: 48px; }
.aside-rows {
  border-top: 1px solid var(--line);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 15px;
  margin: 0;
}
.aside-rows div { display: flex; justify-content: space-between; gap: 12px; }
.aside-rows dt { color: var(--text-2); }
.aside-rows dd { margin: 0; text-align: right; }

/* Start screen */

.start-main {
  max-width: 960px;
  margin: 0 auto;
  padding: 72px 32px;
  display: flex;
  flex-direction: column;
  gap: 40px;
}
.start-main h1 { margin: 0; font-size: 40px; font-weight: 600; line-height: 1.15; }
.start-main .lede { margin: 0; font-size: 18px; color: var(--text-2); max-width: 640px; line-height: 1.5; }
.start-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.start-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 32px;
  background: var(--surface);
  border: 2px solid var(--line);
  border-radius: 12px;
  text-decoration: none;
  color: var(--text);
  min-height: 220px;
}
.start-card:hover { color: var(--text); border-color: var(--text); }
.start-card .icon { width: 48px; height: 48px; color: var(--accent); }
.start-card .title { font-size: 24px; font-weight: 600; }
.start-card .desc { font-size: 16px; color: var(--text-2); line-height: 1.5; }

/* Tabs */

.tablist { display: flex; flex-wrap: wrap; gap: 8px; padding-bottom: 12px; border-bottom: 1px solid var(--control); }
.tab {
  min-height: 48px;
  padding: 0 18px;
  border: 1px solid var(--control);
  border-radius: 8px;
  background: var(--surface);
  font-size: 16px;
  color: var(--text);
}
.tab:hover { border-color: var(--accent); }
.tab[aria-selected="true"] { border: 2px solid var(--accent); background: var(--selected); padding: 0 17px; font-weight: 600; }
.preset-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.preset-btn { align-self: center; min-height: 44px; }
.sentence-row .after { line-height: 1.5; }
.measure-heading { margin: 0; font-size: 22px; font-weight: 600; }
.past-data { display: flex; flex-direction: column; gap: 12px; }
.disclosure {
  align-self: flex-start;
  min-height: 44px;
  padding: 0 4px;
  border: none;
  background: none;
  color: var(--accent);
  font-size: 15px;
  font-weight: 500;
  text-decoration: underline;
}
.disclosure:hover { color: var(--accent-hover); }
.tab .tab-flag { color: var(--warn); font-size: 13px; margin-left: 6px; }

.readout-line {
  display: flex;
  gap: 12px;
  align-items: baseline;
  flex-wrap: wrap;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}
.readout-line .value { font-size: 18px; font-weight: 600; font-family: var(--mono); }

details.advanced { border-top: 1px solid var(--line); padding-top: 14px; }
details summary { font-size: 15px; font-weight: 500; cursor: pointer; min-height: 32px; }
.details-body { padding-top: 12px; display: flex; flex-direction: column; gap: 14px; }

.comparison-head {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

/* Plan screen */

.plan-main {
  max-width: 1040px;
  margin: 0 auto;
  padding: 40px 32px 56px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.readout-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.readout-grid > div { background: var(--surface); padding: 20px; }
.readout-grid .value { font-size: 20px; margin-top: 10px; }
.readout-grid .value.mono { font-family: var(--mono); }
.readout-grid .hero { font-family: var(--mono); font-size: 64px; font-weight: 500; color: var(--accent); line-height: 1.1; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
.plan-table { min-width: 640px; }
th { text-align: left; padding: 14px 12px; border-bottom: 1px solid var(--line); }
td { padding: 14px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
td.name { font-weight: 600; }
td.needed { font-family: var(--mono); font-weight: 600; }
td.needed.covered { color: var(--accent); }
td.needed.under { color: var(--warn); }
td.why { color: var(--text-2); }
.status-word { display: block; font-family: var(--sans); font-size: 12px; font-weight: 500; }

.warning {
  padding: 14px 16px;
  border-left: 3px solid var(--warn);
  background: var(--warn-bg);
  border-radius: 4px;
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
  margin: 0;
}

.slider-label { display: flex; flex-direction: column; gap: 8px; font-size: 15px; font-weight: 500; }
.slider-label output { font-family: var(--mono); font-size: 18px; color: var(--accent); }
.slider-label input { width: 100%; height: 44px; }

.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
.tile { display: flex; flex-direction: column; gap: 4px; padding: 16px; border: 1px solid var(--line); border-radius: 4px; }
.tile .value { font-family: var(--mono); font-size: 30px; font-weight: 600; color: var(--accent); }
.tile .label { font-size: 14px; color: var(--text-2); line-height: 1.4; }

svg text { font-family: var(--sans); }
.svg-text-2 { fill: var(--text-2); }
.svg-text { fill: var(--text); }
.svg-accent { fill: var(--accent); }

.trail { margin: 12px 0 0; padding-left: 22px; display: flex; flex-direction: column; gap: 10px; font-size: 15px; line-height: 1.55; }
.trail-details summary { font-size: 16px; font-weight: 600; }

.orders { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin: 0; padding: 0; list-style: none; }
.orders li { padding: 10px; border: 1px solid var(--line); border-radius: 4px; font-family: var(--mono); font-size: 14px; }
.orders .num { color: var(--text-2); margin-right: 8px; }

.analysis-measure { display: flex; flex-direction: column; gap: 6px; padding-top: 12px; border-top: 1px solid var(--line); }
.analysis-name { margin: 0; font-size: 16px; font-weight: 600; }
.analysis-steps { margin: 0; padding-left: 0; list-style: none; display: flex; flex-direction: column; gap: 6px; font-size: 15px; line-height: 1.5; }
.analysis-one { margin: 0; font-size: 15px; line-height: 1.5; }

.sub-title { margin: 8px 0 0; font-size: 16px; font-weight: 600; }

/* "Your measures": power bars at the recommended n */
.measure-bars { min-width: 560px; }
.measure-bars td { vertical-align: middle; }
.measure-bars td.needs { font-weight: 600; }
.measure-bars .bar-col { width: 50%; text-transform: none; letter-spacing: normal; font-size: 13px; }
.power-bar { position: relative; height: 14px; border-radius: 7px; background: var(--line); }
.power-fill { height: 100%; border-radius: 7px; }
.power-fill.reaches { background: var(--accent); }
.power-fill.below { background: var(--warn); }
.power-marker { position: absolute; top: -4px; bottom: -4px; width: 2px; margin-left: -1px; background: var(--text); }
.power-text { font-weight: 600; text-align: right; white-space: nowrap; }
.power-text.reaches { color: var(--accent); }
.power-text.below { color: var(--warn); }

.two-col { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.guidance p { margin: 0; font-size: 15px; line-height: 1.55; }

/* Find problems */

.find-table { min-width: 440px; }
.find-table th { padding: 10px 12px; border-bottom: 1px solid var(--control); color: var(--text-2); font-size: 13px; text-transform: uppercase; letter-spacing: 0.05em; }
.find-table td { padding: 12px; font-family: var(--mono); }
.find-table tr.plan-row { background: var(--selected); font-weight: 600; }
.find-table tr.plan-row td { border-bottom: none; }
.sentence { padding: 18px; background: var(--bg); border-radius: 10px; font-size: 17px; line-height: 1.55; margin: 0; }
.curve-box { border: 1px solid var(--line); border-radius: 10px; padding: 16px; display: flex; flex-direction: column; gap: 10px; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
  .chip, .opt, .btn, .pill, .tab { transition: border-color 120ms ease, background-color 120ms ease; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}

@media (max-width: 960px) {
  .readout-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 820px) {
  .header { padding: 16px 20px; }
  .footer-inner { padding: 20px 20px 28px; }
  .page, .plan-main { padding: 32px 20px 48px; }
  .start-main { padding: 48px 20px; }
  .readout-grid .hero { font-size: 52px; }
}