/* =========================================================================
   US Military History
   A modern archival-study identity: warm paper, ink and navy, muted slate,
   restrained oxblood. Document rules and index tabs instead of cards with
   soft shadows; a serif reading column instead of an interface typeface.
   No web fonts, no remote assets, no framework.
   ========================================================================= */

/* ---- Tokens ------------------------------------------------------------ */
:root {
  color-scheme: light;

  --navy-900: #101d33;
  --navy-800: #1b2d4d;
  --navy-700: #27406b;
  --navy-100: #dde4ef;
  --navy-050: #eef1f7;

  --paper-050: #fdfbf6;
  --paper-100: #f7f2e8;
  --paper-200: #ece5d6;
  --paper-300: #d9cfba;

  --oxblood-800: #6d1f2b;
  --oxblood-700: #86293a;
  --oxblood-100: #f6e4e5;

  --slate-700: #3c4757;
  --slate-500: #55637a;

  --surface: var(--paper-050);
  --surface-raised: #ffffff;
  --surface-sunken: var(--paper-100);
  --border: #cfc4ad;
  --border-strong: #9d907a;

  --text: #131c2a;
  --text-muted: var(--slate-500);
  --text-inverse: #ffffff;

  --brand: var(--navy-800);
  --brand-strong: var(--navy-900);
  --brand-soft: var(--navy-050);
  --accent: var(--oxblood-700);
  --accent-strong: var(--oxblood-800);
  --warning: #7a4a05;
  --warning-soft: #fbf0dc;
  --warning-border: #b98d3d;
  --danger: #8c2f1d;
  --danger-soft: #fbeae6;

  --focus: #1b3f8f;
  --focus-inverse: #ffd27a;

  --radius-sm: 2px;
  --radius: 3px;
  --radius-lg: 4px;

  --shadow-sm: none;
  --shadow: none;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;

  --measure: 70ch;
  --shell-max: 74rem;

  --scale: 1;
  --comfort-scale: 1;

  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: ui-serif, Georgia, "Iowan Old Style", "Palatino Linotype", "Times New Roman", serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --motion-fast: 120ms;
  --motion: 200ms;
}

html[data-text-size='large'] { --scale: 1.125; }
html[data-text-size='x-large'] { --scale: 1.25; }
html[data-comfort='on'] { --comfort-scale: 1.06; }

html[data-contrast='high'] {
  --surface: #ffffff;
  --surface-raised: #ffffff;
  --surface-sunken: #f1ece0;
  --text: #06101c;
  --text-muted: #26303f;
  --border: #6b6152;
  --border-strong: #38312a;
  --brand: #12233d;
  --brand-strong: #0a1626;
  --brand-soft: #e7ebf3;
  --accent: #5f1824;
  --accent-strong: #4a111b;
  --warning: #633a02;
  --warning-border: #7d5107;
  --danger: #74240f;
}

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

html {
  font-size: calc(100% * var(--scale) * var(--comfort-scale));
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background-color: var(--surface);
  background-image: linear-gradient(90deg, rgba(27, 45, 77, 0.045) 1px, transparent 1px);
  background-size: 100% 100%;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.62;
  overflow-wrap: break-word;
}

h1, h2, h3, h4 { font-family: var(--font-serif); line-height: 1.22; margin: 0 0 var(--space-3); font-weight: 700; }
p { margin: 0 0 var(--space-4); }
ul, ol { margin: 0 0 var(--space-4); padding-left: 1.25rem; }
img, svg { max-width: 100%; }
mark { background: #f5e2a8; color: #1a1305; padding: 0 0.12em; }
a { color: var(--navy-700); text-underline-offset: 0.18em; }
a:hover { color: var(--brand-strong); }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

.u-visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%);
  white-space: nowrap; border: 0;
}

.muted { color: var(--text-muted); }
.fine-print { color: var(--text-muted); font-size: 0.875rem; }
.fine-print--warning { color: var(--warning); font-weight: 600; }
.dot { padding: 0 0.4em; }

/* ---- Shell ------------------------------------------------------------- */
.skip-link {
  position: absolute; left: var(--space-3); top: -4rem; z-index: 60;
  background: var(--brand); color: var(--text-inverse);
  padding: 0.75rem 1rem; font-weight: 700;
}
.skip-link:focus { top: var(--space-3); }

/* A paper masthead with a double rule, not a coloured bar. */
.site-header {
  background-color: var(--paper-100);
  border-bottom: 1px solid var(--border);
  box-shadow: inset 0 -4px 0 var(--surface), inset 0 -5px 0 var(--navy-800);
  position: relative;
}
/* Masthead above, index tabs below — a two-row header rather than one long bar. */
.site-header__inner {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: var(--space-3) var(--space-4) 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas: 'brand search' 'nav nav';
  align-items: center;
  gap: var(--space-3) var(--space-4);
}
.brand { grid-area: brand; }
.site-nav { grid-area: nav; }
.site-header__search { grid-area: search; justify-self: end; }
.brand { display: flex; align-items: center; gap: var(--space-3); color: var(--brand-strong); text-decoration: none; min-height: 44px; }
.brand__mark { display: inline-flex; color: var(--accent); }
.brand__name { display: block; font-family: var(--font-serif); font-weight: 700; font-size: 1.2rem; letter-spacing: 0.01em; }
.brand__tagline { display: block; font-size: 0.8125rem; color: var(--slate-500); }
.brand:hover .brand__name { text-decoration: underline; }

/* Navigation reads as archival index tabs. */
.site-nav__list { list-style: none; display: flex; flex-wrap: wrap; gap: var(--space-1); margin: 0; padding: 0; }
.site-nav__link { margin-bottom: -1px; }
.site-nav__link {
  display: inline-flex; align-items: center; min-height: 44px;
  padding: 0 var(--space-3);
  color: var(--slate-700); text-decoration: none; font-weight: 600; font-size: 0.9375rem;
  border: 1px solid transparent; border-bottom: 0;
}
.site-nav__link:hover { background: var(--paper-200); color: var(--brand-strong); }
.site-nav__link[aria-current='page'] {
  background: var(--surface-raised);
  border-color: var(--border);
  color: var(--brand-strong);
  box-shadow: 0 3px 0 var(--accent) inset;
}
.site-header__search {
  display: inline-flex; align-items: center; gap: var(--space-2);
  min-height: 44px; padding: 0 var(--space-4);
  border: 1px solid var(--border-strong);
  color: var(--brand-strong); text-decoration: none; font-weight: 650; font-size: 0.9375rem;
  background: var(--surface-raised);
}
.site-header__search:hover { background: var(--paper-200); }

.site-main { display: block; max-width: var(--shell-max); margin: 0 auto; padding: var(--space-5) var(--space-4) var(--space-7); }
.site-main:focus, .site-main:focus-visible { outline: none; }

.site-footer { border-top: 3px double var(--border-strong); background: var(--paper-100); margin-top: var(--space-6); }
.site-footer__inner { max-width: var(--shell-max); margin: 0 auto; padding: var(--space-5) var(--space-4); }
.site-footer__cutoff { font-weight: 600; color: var(--slate-700); max-width: var(--measure); }
.site-footer__nav ul { list-style: none; display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-4); padding: 0; margin: 0 0 var(--space-4); }
.site-footer__nav a { min-height: 44px; display: inline-flex; align-items: center; }
.site-footer__privacy { color: var(--text-muted); font-size: 0.875rem; margin: 0; }

/* ---- Page furniture ---------------------------------------------------- */
.page { display: flex; flex-direction: column; gap: var(--space-6); }
.page-header { max-width: var(--measure); }
.page-title { font-size: clamp(1.7rem, 1.2rem + 2vw, 2.4rem); margin-bottom: var(--space-3); }
.page-lede { color: var(--slate-700); font-size: 1.0625rem; margin: 0; }
.page-header__actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-4); }

.eyebrow {
  display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2);
  text-transform: uppercase; letter-spacing: 0.1em;
  font-size: 0.75rem; font-weight: 700; color: var(--accent-strong);
  margin: 0 0 var(--space-2);
}
.breadcrumb { font-size: 0.9375rem; color: var(--text-muted); margin: 0; }
.breadcrumb a { min-height: 44px; display: inline-flex; align-items: center; }

.section { border-top: 1px solid var(--border); padding-top: var(--space-5); }
.section--plain { border-top: 0; padding-top: 0; }
.section--muted { background: var(--paper-100); border: 1px solid var(--border); padding: var(--space-5); }
.section--danger { background: var(--danger-soft); border: 1px solid #d8b3aa; padding: var(--space-5); }
.section__head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: var(--space-3); }
.section__title { font-size: 1.3rem; margin: 0 0 var(--space-2); }
.section__lede { color: var(--text-muted); max-width: var(--measure); }
.cutoff-strip { border-left: 4px solid var(--navy-700); background: var(--navy-050); padding: var(--space-3) var(--space-4); font-size: 0.9375rem; margin: 0; }

/* ---- Buttons and chips ------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  min-height: 44px; padding: 0.5rem 1rem;
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  font: inherit; font-weight: 650; text-decoration: none; cursor: pointer;
  background: var(--surface-raised); color: var(--brand-strong);
  transition: background var(--motion-fast) ease;
}
.btn--large { min-height: 52px; padding: 0.6rem 1.4rem; font-size: 1.0625rem; }
.btn--primary { background: var(--brand); color: var(--text-inverse); border-color: var(--brand); }
.btn--primary:hover { background: var(--brand-strong); color: var(--text-inverse); }
.btn--secondary { background: var(--surface-raised); color: var(--brand-strong); border-color: var(--brand); }
.btn--secondary:hover { background: var(--brand-soft); }
.btn--ghost { background: transparent; color: var(--slate-700); }
.btn--ghost:hover { background: var(--paper-200); }
.btn--danger { background: var(--danger); color: var(--text-inverse); border-color: var(--danger); }
.btn--danger:hover { background: #6f2417; color: var(--text-inverse); }
.btn[aria-pressed='true'] { background: var(--accent); border-color: var(--accent); color: var(--text-inverse); }
.btn[aria-pressed='true']:hover { background: var(--accent-strong); color: var(--text-inverse); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

.chip {
  display: inline-flex; align-items: center; gap: var(--space-2);
  min-height: 44px; padding: 0.35rem 0.9rem;
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  background: var(--surface-raised); color: var(--slate-700);
  font: inherit; font-size: 0.9375rem; font-weight: 600; cursor: pointer;
}
.chip:hover { background: var(--paper-200); }
.chip[aria-pressed='true'] { background: var(--brand); border-color: var(--brand); color: var(--text-inverse); }
.chip[aria-pressed='true'] .chip__count { background: rgba(255,255,255,0.2); color: var(--text-inverse); }
.chip:disabled { opacity: 0.5; cursor: not-allowed; text-decoration: line-through; }
.chip__count { background: var(--paper-200); padding: 0 0.45rem; font-size: 0.8125rem; font-variant-numeric: tabular-nums; }
.chip-list { list-style: none; display: flex; flex-wrap: wrap; gap: var(--space-2); padding: 0; }
.filters { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.icon { flex: none; }
.icon--inline { vertical-align: -0.15em; margin-left: 0.25em; }

/* ---- Fields ------------------------------------------------------------ */
.toolbar { display: flex; flex-direction: column; gap: var(--space-3); }
.field { position: relative; display: flex; align-items: center; }
.field__icon { position: absolute; left: 0.85rem; display: inline-flex; color: var(--text-muted); pointer-events: none; }
.field__input {
  width: 100%; min-height: 44px; padding: 0.55rem 2.5rem 0.55rem 2.6rem;
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  background: var(--surface-raised); color: var(--text); font: inherit;
}
.field__input--large { min-height: 52px; font-size: 1.0625rem; }
.field__input::placeholder { color: #67707d; }
.field__clear { position: absolute; right: 0.4rem; width: 44px; height: 44px; border: 0; background: transparent; color: var(--slate-700); font-size: 1.4rem; cursor: pointer; }
.field__clear:hover { background: var(--paper-200); }
.field__hint { color: var(--text-muted); font-size: 0.875rem; margin: var(--space-2) 0 0; }
.select {
  min-height: 44px; width: 100%; padding: 0.4rem 0.6rem;
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  background: var(--surface-raised); color: var(--text); font: inherit;
}

/* ---- Cards: index sheets, not floating tiles --------------------------- */
.card-grid { display: grid; gap: var(--space-4); grid-template-columns: minmax(0, 1fr); }
.card {
  position: relative;
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-top: 3px solid var(--navy-800);
  padding: var(--space-4);
  display: flex; flex-direction: column; gap: var(--space-2);
}
.card--saved { border-top-color: var(--accent); }
.card__eyebrow { margin: 0; font-size: 0.8125rem; }
.card__title { font-size: 1.0625rem; margin: 0; }
.card__link { color: var(--brand-strong); text-decoration: none; }
.card__link:hover { text-decoration: underline; }
.card__link::after { content: ''; position: absolute; inset: 0; }
.card__description { margin: 0; color: var(--slate-700); font-size: 0.9375rem; display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden; }
.card__footer { margin: auto 0 0; display: flex; flex-wrap: wrap; gap: var(--space-3); color: var(--text-muted); font-size: 0.8125rem; }
.card__flag { color: var(--accent-strong); font-weight: 700; }
.day-chip__title, .card__description, .data-list__value, .checklist__detail, .timeline__value, .data-table__value { overflow-wrap: anywhere; }

.topic-tag { display: inline-block; background: var(--navy-100); color: var(--navy-900); padding: 0.15rem 0.6rem; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; }
.badge { display: inline-block; padding: 0.15rem 0.5rem; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; background: var(--navy-100); color: var(--navy-900); border: 1px solid #b7c2d6; }
.badge--timeline { background: var(--oxblood-100); color: var(--oxblood-800); border-color: #d8aeb3; }
.badge--checklist { background: var(--paper-200); color: #4a3a1c; border-color: var(--paper-300); }
.badge--glossary { background: #e6efe6; color: #294029; border-color: #b7ceb7; }
.badge--daily { background: var(--navy-100); color: var(--navy-900); border-color: #b7c2d6; }
.badge--subject { background: #e6efe6; color: #294029; border-color: #b7ceb7; }
.badge--reference { background: var(--oxblood-100); color: var(--oxblood-800); border-color: #d8aeb3; }

/* ---- Home -------------------------------------------------------------- */
.hero {
  display: grid; gap: var(--space-5);
  background-color: var(--surface-raised);
  border: 1px solid var(--border);
  border-top: 6px double var(--navy-800);
  padding: var(--space-5);
  position: relative;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(27,45,77,0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(27,45,77,0.05) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
}
.hero > * { position: relative; }
.hero__title { font-size: clamp(1.85rem, 1.2rem + 2.6vw, 2.75rem); }
.hero__lede { max-width: 54ch; color: var(--slate-700); font-size: 1.0625rem; }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.hero__card { background: var(--navy-050); border: 1px solid var(--navy-100); border-left: 4px solid var(--navy-800); padding: var(--space-4); display: flex; flex-direction: column; gap: var(--space-2); }
.hero__card-eyebrow { text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.75rem; font-weight: 700; color: var(--accent-strong); margin: 0; }
.hero__card-title { font-size: 1.125rem; margin: 0; }
.hero__card-meta, .hero__card-note { margin: 0; font-size: 0.875rem; color: var(--slate-700); }

.method-panel { border: 1px solid var(--border-strong); border-left: 5px solid var(--navy-800); background: var(--paper-100); padding: var(--space-5); }
.method-panel--compact { padding: var(--space-4); }
.method-panel__title { font-size: 1.2rem; margin: 0 0 var(--space-3); }
.method-panel__body { max-width: var(--measure); color: var(--slate-700); font-weight: 600; }
.method-panel__list { margin: 0; color: var(--slate-700); }
.method-panel__list li { margin-bottom: var(--space-2); }

.feature { background: var(--surface-raised); border: 1px solid var(--border); padding: var(--space-4); }
.feature__title { font-size: 1.3rem; margin: 0 0 var(--space-2); }
.feature__text { color: var(--slate-700); max-width: var(--measure); }
.feature__meta { margin: 0; color: var(--text-muted); font-size: 0.875rem; }

/* ---- Group use --------------------------------------------------------- */
.notice-stack { display: grid; gap: var(--space-3); margin-bottom: var(--space-4); }
.notice-stack .notice { margin-bottom: 0; }
.group-panel {
  border: 1px solid var(--border-strong);
  border-top: 3px solid var(--accent);
  background: var(--surface-raised);
  padding: var(--space-5);
}
.group-panel--compact { padding: var(--space-4); }
.group-panel__head { display: flex; align-items: center; gap: var(--space-3); }
.group-panel__icon { color: var(--accent); display: inline-flex; }
.group-panel__title { font-size: 1.2rem; margin: 0; }
.group-panel__body { margin: var(--space-3) 0; max-width: var(--measure); color: var(--slate-700); }
.group-panel__list { margin: 0; color: var(--slate-700); max-width: var(--measure); }
.group-panel__list li { margin-bottom: var(--space-2); }
.group-panel__footnote { margin: var(--space-3) 0 0; color: var(--text-muted); font-size: 0.875rem; }

/* ---- Diagrams and figures ---------------------------------------------- */
.figure { margin: 0 0 var(--space-4); border: 1px solid var(--border); background: var(--surface-raised); }
.figure__canvas { background: var(--navy-050); padding: var(--space-4); display: flex; justify-content: center; }
.figure__caption { padding: var(--space-4); }
.figure__caption-text { margin: 0 0 var(--space-3); font-weight: 600; }
.figure__legend { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-2); }
.figure__legend-item { display: grid; grid-template-columns: 1.6rem 1fr; gap: var(--space-3); align-items: start; font-size: 0.9375rem; }
.figure__legend-number {
  display: inline-flex; align-items: center; justify-content: center;
  width: 1.6rem; height: 1.6rem; border-radius: 50%;
  background: var(--navy-800); color: var(--text-inverse);
  font-size: 0.8125rem; font-weight: 700; font-family: var(--font-sans);
}
.figure__legend-text { color: var(--slate-700); }
.figure__source { margin: var(--space-3) 0 0; color: var(--text-muted); font-size: 0.8125rem; }

.diagram { width: 100%; max-width: 34rem; height: auto; display: block; }
.diagram__marker-dot { fill: var(--accent); }
.diagram__marker-text { fill: #ffffff; font-size: 11px; font-weight: 700; font-family: var(--font-sans); }
.diagram__leader { stroke: var(--accent); stroke-width: 1.4; fill: none; }
.diagram__arrowhead { fill: var(--navy-800); }

.chart__box { fill: var(--paper-100); stroke: var(--navy-800); stroke-width: 1.8; }
.chart__box--command { fill: var(--navy-100); }
.chart__box--muted { fill: var(--surface-raised); stroke: var(--border-strong); stroke-dasharray: 4 4; }
.chart__label { font-family: var(--font-sans); font-size: 10.5px; font-weight: 600; fill: var(--text); }
.chart__label--axis { font-size: 9.5px; font-weight: 400; fill: var(--slate-700); }
.chart__label--phase { font-size: 9.5px; font-weight: 500; fill: var(--slate-700); }
.chart__label--row { font-size: 10px; fill: var(--slate-700); }
.chart__title { font-family: var(--font-serif); font-size: 15px; font-weight: 700; fill: var(--navy-900); }
.chart__title--sub { font-size: 12px; font-weight: 400; fill: var(--slate-700); }
.chart__arrow { fill: none; stroke: var(--navy-800); stroke-width: 2; }
.chart__rule { fill: none; stroke: var(--border-strong); stroke-width: 1.6; }
.chart__rule--tension { stroke: var(--accent); stroke-width: 1.6; stroke-dasharray: 5 4; }
.chart__rule--parallel { stroke: var(--accent); stroke-width: 1.4; stroke-dasharray: 6 5; }
.chart__divider { stroke: var(--border); stroke-width: 1; stroke-dasharray: 3 5; fill: none; }
.chart__mark { fill: var(--navy-800); }
.chart__series { fill: none; stroke: var(--accent); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.chart__span { fill: var(--navy-100); stroke: var(--navy-800); stroke-width: 1.4; }
.chart__span--point { fill: var(--accent); stroke: var(--accent-strong); }

.panel { display: grid; gap: var(--space-3); }
.panel__rows { border: 1px solid var(--border); background: var(--paper-100); padding: var(--space-3) var(--space-4); }
.panel__summary { cursor: pointer; font-weight: 650; min-height: 44px; display: flex; align-items: center; }
.panel__rows[open] .panel__summary { margin-bottom: var(--space-3); }

/* ---- Drawings inside reference rows ------------------------------------- */
.row-art { display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; margin-bottom: var(--space-1); }
.row-art__link { display: inline-flex; border-radius: 6px; }
.row-art__label { display: block; }
.diagram--row { width: 6.5rem; max-width: 6.5rem; height: auto; }
.card__eyebrow-row { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); }
.card__thumb { display: inline-flex; flex: none; opacity: 0.9; }
.card__thumb .diagram--row { width: 4.5rem; max-width: 4.5rem; }
.data-table__label, .data-list__label, .checklist__term { display: block; }

/* A whole-panel chart needs more room than a species thumbnail to stay legible. */
.card__thumb .diagram--row { width: 7rem; max-width: 7rem; }

/* ---- Rows that qualify the rest of the card ----------------------------- */
.data-table tr.is-qualifier th, .data-table tr.is-qualifier td { background: var(--warning-soft); color: #46330b; }
.data-table tr.is-qualifier th { box-shadow: inset 4px 0 0 var(--warning-border); }
.data-list__label.is-qualifier, .data-list__value.is-qualifier { background: var(--warning-soft); color: #46330b; box-shadow: inset 4px 0 0 var(--warning-border); }
.checklist__item.is-qualifier, .timeline__item.is-qualifier { background: var(--warning-soft); box-shadow: inset 4px 0 0 var(--warning-border); }
.checklist__item.is-qualifier .checklist__detail { color: #46330b; }

/* ---- Progress ---------------------------------------------------------- */
.progress { display: flex; flex-direction: column; gap: var(--space-2); }
.progress__label { margin: 0; font-size: 0.9375rem; }
.meter { height: 8px; background: var(--paper-200); border: 1px solid var(--border); overflow: hidden; }
.meter__fill { display: block; height: 100%; width: var(--meter-value, 0%); background: var(--navy-800); }
.meter--accent .meter__fill { background: var(--accent); }
.daily-progress { display: flex; flex-direction: column; gap: var(--space-2); background: var(--surface-raised); border: 1px solid var(--border); padding: var(--space-4); }
.daily-progress__note { margin: 0; color: var(--text-muted); font-size: 0.875rem; }
.saved-progress { display: flex; flex-direction: column; gap: var(--space-4); }

/* ---- Day index: a chronological rail ----------------------------------- */
.day-index { list-style: none; padding: 0; margin: 0; display: grid; gap: 0; grid-template-columns: minmax(0, 1fr); }
.day-index--rail .day-index__item { border-left: 2px solid var(--border); }
.day-chip {
  display: grid; grid-template-columns: auto 1fr auto;
  grid-template-areas: 'glyph day years' 'glyph title title' 'glyph status status';
  gap: 0 var(--space-3); align-items: center;
  min-height: 44px; padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border);
  background: transparent; text-decoration: none; color: var(--text);
}
.day-chip:hover { background: var(--paper-100); }
.day-chip__glyph { grid-area: glyph; font-size: 1.15rem; line-height: 1; color: var(--text-muted); }
.day-chip__day { grid-area: day; font-weight: 700; font-size: 0.8125rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-muted); }
.day-chip__years { grid-area: years; font-family: var(--font-mono); font-size: 0.8125rem; color: var(--accent-strong); white-space: nowrap; }
.day-chip__title { grid-area: title; font-family: var(--font-serif); font-weight: 700; }
.day-chip__status { grid-area: status; font-size: 0.8125rem; color: var(--text-muted); }
.day-chip.is-complete { background: var(--navy-050); }
.day-chip.is-complete .day-chip__glyph { color: var(--navy-800); }
.day-chip.is-started .day-chip__glyph { color: var(--accent); }
.day-index--compact { grid-template-columns: repeat(auto-fill, minmax(6rem, 1fr)); gap: 0; }
.day-index--compact .day-chip { grid-template-columns: auto auto; grid-template-areas: 'glyph day'; justify-content: start; border: 1px solid var(--border); margin: -0.5px; }

/* ---- Lesson and article: a serif reading column ------------------------ */
.prose { max-width: var(--measure); }
.prose__p { margin: 0 0 var(--space-4); }
.lesson__header { border-bottom: 3px double var(--border-strong); padding-bottom: var(--space-4); margin-bottom: var(--space-4); }
.lesson-years { margin: 0 0 var(--space-3); font-size: 0.875rem; color: var(--slate-700); }
.lesson-years__label { font-weight: 700; }
.lesson-years__value { font-family: var(--font-mono); color: var(--accent-strong); font-weight: 700; }
.lesson-years__note { color: var(--text-muted); }
.lesson__status { display: flex; flex-wrap: wrap; gap: var(--space-2); margin: 0; }
.pill { display: inline-flex; align-items: center; padding: 0.2rem 0.7rem; font-size: 0.8125rem; font-weight: 650; border: 1px solid var(--border-strong); background: var(--paper-100); color: var(--slate-700); }
.pill--done { background: var(--navy-050); border-color: var(--navy-700); color: var(--navy-900); }
.lesson__body, .article__intro, .concept__body, .expert-tip__body { font-family: var(--font-serif); font-size: 1.09rem; line-height: 1.7; }
.lesson__controls, .article__controls { display: flex; flex-wrap: wrap; gap: var(--space-3); margin: var(--space-5) 0; }

.action-card { background: var(--paper-100); border: 1px solid var(--border-strong); border-left: 5px solid var(--accent); padding: var(--space-4); margin: var(--space-5) 0; }
.action-card__title { font-size: 1.0625rem; margin: 0 0 var(--space-2); }
.action-card__text { margin: 0 0 var(--space-3); font-family: var(--font-serif); font-size: 1.05rem; }
.action-card__caveat { margin: 0 0 var(--space-3); color: var(--text-muted); font-size: 0.875rem; }
.action-card__controls { display: flex; flex-wrap: wrap; gap: var(--space-3); }

.pager { display: grid; gap: var(--space-3); grid-template-columns: minmax(0, 1fr); border-top: 1px solid var(--border); padding-top: var(--space-4); }
.pager__link { display: flex; align-items: center; gap: var(--space-3); min-height: 44px; padding: var(--space-3); border: 1px solid var(--border); background: var(--surface-raised); text-decoration: none; color: var(--text); }
.pager__link:hover { background: var(--paper-100); }
.pager__link--next { justify-content: flex-end; text-align: right; }
.pager__link.is-disabled { color: var(--text-muted); background: var(--paper-100); border-style: dashed; }
.pager__hint { display: block; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); font-weight: 700; }
.pager__title { display: block; font-family: var(--font-serif); font-weight: 700; }

.article-layout { display: grid; gap: var(--space-5); grid-template-columns: minmax(0, 1fr); }
.contents { background: var(--paper-100); border: 1px solid var(--border); border-top: 3px solid var(--navy-800); padding: var(--space-4); }
.contents__title { font-size: 0.8125rem; text-transform: uppercase; letter-spacing: 0.08em; margin: 0 0 var(--space-2); color: var(--text-muted); font-family: var(--font-sans); }
.contents__list { margin: 0; padding-left: 1.1rem; font-size: 0.9375rem; }
.contents__list li { margin-bottom: var(--space-2); }
.article__header { border-bottom: 3px double var(--border-strong); padding-bottom: var(--space-3); margin-bottom: var(--space-4); }
.article__section-title, .expert-tip__title { scroll-margin-top: 5.5rem; }
.article__section-title { font-size: 1.4rem; margin-top: var(--space-6); }
.concept { margin-bottom: var(--space-5); padding-left: var(--space-4); border-left: 2px solid var(--paper-300); }
.concept__title { display: flex; gap: var(--space-3); align-items: baseline; font-size: 1.15rem; scroll-margin-top: 5rem; }
.concept__number { flex: none; width: 1.6rem; height: 1.6rem; background: var(--navy-800); color: var(--text-inverse); display: inline-flex; align-items: center; justify-content: center; font-family: var(--font-sans); font-size: 0.8125rem; font-weight: 700; }
.concept__body { margin-left: 0; }
.expert-tip { background: var(--oxblood-100); border: 1px solid #d8aeb3; border-left: 5px solid var(--accent); padding: var(--space-4); margin-top: var(--space-6); }
.expert-tip__title { font-size: 1.0625rem; color: var(--oxblood-800); margin: 0 0 var(--space-2); }

/* ---- Reference data ---------------------------------------------------- */
.reference__header { border-bottom: 3px double var(--border-strong); padding-bottom: var(--space-3); margin-bottom: var(--space-4); }
.checklist-progress { margin: var(--space-3) 0 0; font-weight: 600; }

.table-wrap { overflow-x: auto; border: 1px solid var(--border); background: var(--surface-raised); }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.9375rem; }
.data-table th, .data-table td { text-align: left; vertical-align: top; padding: var(--space-3) var(--space-4); border-bottom: 1px solid var(--border); }
.data-table thead th { background: var(--paper-100); font-size: 0.8125rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--slate-700); border-bottom: 2px solid var(--border-strong); }
.data-table tbody tr:last-child th, .data-table tbody tr:last-child td { border-bottom: 0; }
.data-table__label { width: 30%; min-width: 11rem; font-weight: 700; }

.data-list { display: grid; margin: 0; border: 1px solid var(--border); background: var(--surface-raised); }
.data-list__label { padding: var(--space-3) var(--space-4) 0; font-weight: 700; color: var(--brand-strong); }
.data-list__value { margin: 0; padding: var(--space-2) var(--space-4) var(--space-4); border-bottom: 1px solid var(--border); }
.data-list__value:last-child { border-bottom: 0; }

/* Timelines stay vertical ordered lists at every width. */
.timeline { list-style: none; margin: 0; padding: 0; border-left: 2px solid var(--paper-300); }
.timeline__item { display: grid; grid-template-columns: auto 1fr; gap: var(--space-3); padding: 0 0 var(--space-4) var(--space-4); position: relative; }
.timeline__marker { width: 10px; height: 10px; background: var(--navy-800); margin: 0.5rem 0 0 -1.35rem; transform: rotate(45deg); }
.timeline__label { display: block; font-family: var(--font-mono); font-size: 0.9375rem; font-weight: 700; color: var(--accent-strong); }
.timeline__value { margin: var(--space-1) 0 0; font-family: var(--font-serif); }

.checklist { list-style: none; margin: 0; padding: 0; border: 1px solid var(--border); background: var(--surface-raised); }
.checklist__item { display: flex; gap: var(--space-3); align-items: flex-start; padding: var(--space-3) var(--space-4); border-bottom: 1px solid var(--border); min-height: 44px; }
.checklist__item:last-child { border-bottom: 0; }
.checklist__input { width: 1.5rem; height: 1.5rem; margin: 0.35rem 0 0; flex: none; accent-color: var(--navy-800); }
.checklist__label { display: block; cursor: pointer; padding: 0.25rem 0; }
.checklist__term { display: block; font-weight: 700; }
.checklist__detail { display: block; color: var(--slate-700); }
.external-link { font-weight: 600; overflow-wrap: anywhere; }

/* ---- Chronology and comparison ----------------------------------------- */
.compare { display: grid; gap: var(--space-4); }
.compare__controls { display: grid; gap: var(--space-3); grid-template-columns: minmax(0, 1fr); }
.compare__field { display: grid; gap: var(--space-2); }
.compare__label { font-weight: 650; font-size: 0.9375rem; }
.compare__grid { display: grid; gap: var(--space-4); grid-template-columns: minmax(0, 1fr); }
.compare__panel { border: 1px solid var(--border); border-top: 3px solid var(--navy-800); background: var(--surface-raised); padding: var(--space-4); }
.compare__panel--empty { border-top-color: var(--border-strong); border-style: dashed; display: flex; align-items: center; justify-content: center; min-height: 8rem; }
.compare__title { font-size: 1.0625rem; margin: 0 0 var(--space-2); }
.compare__meta { color: var(--text-muted); font-size: 0.875rem; }
.chronology-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; counter-reset: chrono; }
.chronology-list__item { border-bottom: 1px solid var(--border); padding: var(--space-4) 0; }
.chronology-list__head { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3); }
.chronology-list__title { font-size: 1.0625rem; margin: 0; }
.chronology-list__meta { margin: var(--space-2) 0 0; color: var(--text-muted); font-size: 0.875rem; }

/* ---- Search ------------------------------------------------------------ */
.results { min-height: 4rem; }
.results__count { font-weight: 650; margin: 0; }
.search-results { list-style: none; margin: var(--space-4) 0 0; padding: 0; display: grid; gap: 0; }
.search-result { border-bottom: 1px solid var(--border); padding: var(--space-4) 0; }
.search-result__meta { display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; margin: 0 0 var(--space-2); font-size: 0.8125rem; }
.search-result__context { color: var(--text-muted); }
.search-result__title { font-size: 1.125rem; margin: 0 0 var(--space-2); }
.search-result__field { margin: 0 0 var(--space-2); font-size: 0.8125rem; color: var(--text-muted); }
.search-result__snippet { margin: 0; color: var(--slate-700); font-family: var(--font-serif); }
.search-suggestions { margin-top: var(--space-4); }
.search-form { display: block; }

/* ---- Lists and states -------------------------------------------------- */
.link-list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-2); }
.link-list a { display: inline-flex; align-items: center; min-height: 44px; font-weight: 600; }
.link-list--rich li { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-3); align-items: baseline; border-bottom: 1px solid var(--border); padding-bottom: var(--space-2); }
.link-list__meta { color: var(--text-muted); font-size: 0.875rem; }
.plain-list { margin: 0 0 var(--space-3); padding-left: 1.1rem; }
.saved-groups { display: grid; gap: var(--space-5); }

.empty-state { border: 1px dashed var(--border-strong); background: var(--paper-100); padding: var(--space-6) var(--space-4); text-align: center; }
.empty-state__title { font-family: var(--font-serif); font-weight: 700; font-size: 1.15rem; margin: 0 0 var(--space-2); }
.empty-state__message { color: var(--slate-700); max-width: 52ch; margin: 0 auto var(--space-4); }
.empty-state__actions { display: flex; flex-wrap: wrap; gap: var(--space-3); justify-content: center; }

.state-panel { max-width: 44rem; margin: var(--space-6) auto; background: var(--surface-raised); border: 1px solid var(--border); border-top: 4px solid var(--navy-800); padding: var(--space-5); }
.state-panel--error { border-top-color: var(--danger); }
.state-panel__title { font-family: var(--font-serif); font-size: 1.3rem; font-weight: 700; margin: 0 0 var(--space-2); }
.state-panel__body { color: var(--slate-700); }
.state-panel__details { color: var(--slate-700); font-family: var(--font-mono); font-size: 0.875rem; }
.state-panel__links { list-style: none; padding: 0; display: grid; gap: var(--space-2); }
.state-panel__links a { min-height: 44px; display: inline-flex; align-items: center; font-weight: 600; }
.state-panel__actions { display: flex; gap: var(--space-3); flex-wrap: wrap; }

.notice { display: flex; gap: var(--space-3); padding: var(--space-4); margin: 0 0 var(--space-4); border: 1px solid var(--border-strong); background: var(--paper-100); }
.notice--warning { border-color: var(--warning-border); background: var(--warning-soft); color: #46330b; }
.notice--warning a { color: var(--warning); }
.notice__icon { flex: none; color: var(--navy-800); }
.notice--warning .notice__icon { color: var(--warning); }
.notice--supervision { border-color: var(--navy-800); border-left: 5px solid var(--navy-800); background: var(--navy-050); color: var(--text); }
.notice--supervision .notice__icon { color: var(--navy-800); }
.notice--supervision a { color: var(--navy-700); }
.notice__title { font-weight: 700; margin: 0 0 var(--space-2); }
.notice__text { margin: 0; }
.notice__links { margin: var(--space-2) 0 0; padding-left: 1.1rem; }

/* ---- Settings ---------------------------------------------------------- */
.settings { display: grid; gap: var(--space-5); }
.settings__group { border: 1px solid var(--border); padding: var(--space-4); margin: 0; background: var(--surface-raised); }
.settings__legend { font-weight: 700; padding: 0 var(--space-2); font-family: var(--font-serif); }
.settings__description { color: var(--text-muted); font-size: 0.9375rem; }
.radio-row { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.radio-row__item { display: flex; align-items: center; gap: var(--space-2); min-height: 44px; }
.radio-row__input { width: 1.25rem; height: 1.25rem; accent-color: var(--navy-800); }
.radio-row__label { cursor: pointer; }
.switch { display: flex; align-items: center; gap: var(--space-3); min-height: 44px; }
.switch__input { width: 1.5rem; height: 1.5rem; accent-color: var(--navy-800); }
.switch__label { font-weight: 600; cursor: pointer; }
.danger-zone { display: grid; gap: var(--space-3); }
.confirm { border: 2px solid var(--danger); padding: var(--space-4); background: var(--surface-raised); }
.confirm__title { font-weight: 700; margin: 0 0 var(--space-2); }
.confirm__actions { display: flex; flex-wrap: wrap; gap: var(--space-3); }

.noscript { max-width: 44rem; margin: var(--space-6) auto; padding: var(--space-5); border: 1px solid var(--border); background: var(--surface-raised); }
.page-404 { background: var(--surface); }

/* ---- Responsive -------------------------------------------------------- */
/* Narrow screens: tighter tabs so the header does not eat the first screen. */
@media (max-width: 39.99rem) {
  .site-nav__link { padding: 0 var(--space-2); font-size: 0.875rem; }
  .site-nav__list { gap: 0; }
  .brand__tagline { font-size: 0.75rem; }
}

@media (min-width: 40rem) {
  .card-grid--modes, .card-grid--references, .card-grid--subjects { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .pager { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .compare__controls { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .toolbar { flex-direction: row; align-items: center; justify-content: space-between; flex-wrap: wrap; }
  .toolbar .field { min-width: 18rem; flex: 1 1 18rem; }
}

@media (min-width: 60rem) {
  .site-header { position: sticky; top: 0; z-index: 40; }
  .hero { grid-template-columns: 1.6fr 1fr; align-items: start; }
  .card-grid--modes { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .card-grid--references { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .article-layout { grid-template-columns: 17rem minmax(0, 1fr); align-items: start; }
  .contents { position: sticky; top: 5.5rem; }
  .compare__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: start; }
  .site-main { padding-inline: var(--space-5); }
}

/* Reading mode: a narrower measure and quieter chrome. */
html[data-comfort='on'] { --measure: 62ch; }
html[data-comfort='on'] .hero::before, html[data-comfort='on'] body { background-image: none; }
html[data-comfort='on'] .card, html[data-comfort='on'] .settings__group { border-top-width: 1px; }
html[data-comfort='on'] .card__description { -webkit-line-clamp: initial; display: block; overflow: visible; }
html[data-comfort='on'] .lesson__body, html[data-comfort='on'] .article__intro,
html[data-comfort='on'] .concept__body, html[data-comfort='on'] .expert-tip__body { font-size: 1.14rem; line-height: 1.75; }

/* Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}
html[data-motion='reduced'] *, html[data-motion='reduced'] *::before, html[data-motion='reduced'] *::after,
html[data-comfort='on'] *, html[data-comfort='on'] *::before, html[data-comfort='on'] *::after {
  animation-duration: 0.001ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.001ms !important;
  scroll-behavior: auto !important;
}

/* ---- Print ------------------------------------------------------------- */
@media print {
  .site-header, .site-footer, .skip-link, .lesson__controls, .article__controls,
  .pager, .toolbar, .filters, .compare__controls, .field { display: none !important; }
  body { background: #ffffff; color: #000000; font-size: 11pt; background-image: none; }
  .site-main { padding: 0; max-width: none; }
  .card, .checklist, .data-list, .table-wrap, .timeline, .reference, .article, .compare__panel { break-inside: avoid; border-color: #999999; }
  .timeline__item { break-inside: avoid; }
  .external-link::after { content: ' (' attr(href) ')'; font-size: 9pt; word-break: break-all; }
  a { color: #000000; text-decoration: underline; }
  .method-panel, .notice { border: 2px solid #000000; background: #ffffff; color: #000000; }
}