/* First Ninety — offline course stylesheet.
   No webfonts, no CDN, no network. System stack only so it renders
   identically from file:// with the machine in airplane mode. */

:root {
  --bg:      #fbf8f3;
  --panel:   #ffffff;
  --ink:     #1f1c17;
  --muted:   #6a6154;
  --line:    #e3dbcd;
  --accent:  #8a5a2b;   /* worked earth */
  --accent2: #3f6b3a;   /* leaf */
  --warn-bg: #fdf3e3;
  --warn-ln: #d9a441;
  --dont-bg: #fbeceb;
  --dont-ln: #b9503f;
  --do-bg:   #eef5ec;
  --do-ln:   #5c8a52;
  --tool-bg: #eef2f7;
  --tool-ln: #4a6d92;
  --radius: 10px;
  --wrap: 760px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:#16140f; --panel:#1f1c16; --ink:#efe9de; --muted:#a79c8a;
    --line:#332e25; --accent:#d69a5c; --accent2:#89b87f;
    --warn-bg:#2b2416; --warn-ln:#9c7526;
    --dont-bg:#2d1c19; --dont-ln:#a4564a;
    --do-bg:#1b271a;   --do-ln:#5d8a53;
    --tool-bg:#1a2129; --tool-ln:#5b82ab;
  }
}
:root[data-theme="dark"] {
  --bg:#16140f; --panel:#1f1c16; --ink:#efe9de; --muted:#a79c8a;
  --line:#332e25; --accent:#d69a5c; --accent2:#89b87f;
  --warn-bg:#2b2416; --warn-ln:#9c7526;
  --dont-bg:#2d1c19; --dont-ln:#a4564a;
  --do-bg:#1b271a;   --do-ln:#5d8a53;
  --tool-bg:#1a2129; --tool-ln:#5b82ab;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.62 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
  overflow-x: hidden;
}

/* ---------- storage warning banner ---------- */
#storage-warning {
  display: none;
  background: var(--dont-bg);
  border-bottom: 2px solid var(--dont-ln);
  color: var(--ink);
  padding: 12px 16px;
  font-size: 15px;
}
#storage-warning.show { display: block; }
#storage-warning b { display: block; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 30;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  padding: 10px 16px;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
}
.brand { text-decoration: none; color: var(--ink); line-height: 1.15; }
.brand b { display: block; font-size: 17px; letter-spacing: .2px; }
.brand span { display: block; font-size: 11.5px; color: var(--muted);
              text-transform: uppercase; letter-spacing: .09em; }
.topbar nav { display: flex; gap: 2px; flex-wrap: wrap; margin-left: auto; }
.topbar nav a {
  text-decoration: none; color: var(--muted);
  padding: 5px 9px; border-radius: 7px; font-size: 14px; white-space: nowrap;
}
.topbar nav a:hover { background: var(--bg); color: var(--ink); }
.topbar nav a[aria-current="page"] { background: var(--accent); color: #fff; }

/* ---------- layout ---------- */
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 30px 16px 90px; }

h1 { font-size: clamp(27px, 5vw, 37px); line-height: 1.16; margin: .1em 0 .35em;
     letter-spacing: -.015em; }
h2 { font-size: clamp(20px, 3.4vw, 25px); line-height: 1.25; margin: 2.1em 0 .5em;
     letter-spacing: -.01em; }
h3 { font-size: 17.5px; margin: 1.5em 0 .4em; }
p { margin: 0 0 1em; }
a { color: var(--accent); }

.kicker { text-transform: uppercase; letter-spacing: .1em; font-size: 12px;
          font-weight: 700; color: var(--accent); margin: 0 0 .2em; }
.lede { font-size: 19.5px; line-height: 1.5; color: var(--ink); }
.meta { display: flex; flex-wrap: wrap; gap: 8px 22px; font-size: 14px;
        color: var(--muted); border-top: 1px solid var(--line);
        border-bottom: 1px solid var(--line); padding: 11px 0; margin: 1.3em 0; }
.meta b { color: var(--ink); font-weight: 600; }

ul.plain, ol.plain { padding-left: 1.15em; }
ul.plain li, ol.plain li { margin-bottom: .55em; }

code { background: var(--bg); border: 1px solid var(--line); border-radius: 4px;
       padding: 1px 5px; font-size: 14px;
       font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

/* ---------- progress ---------- */
.progress-strip { display: flex; gap: 5px; margin: 16px 0 26px; align-items: center; }
.progress-strip i { width: 26px; height: 6px; border-radius: 3px;
                    background: var(--line); display: block; }
.progress-strip i.on { background: var(--accent2); }
.progress-strip em { font-style: normal; font-size: 12.5px; color: var(--muted);
                     margin-left: 8px; }

/* ---------- callouts ---------- */
.warn, .dont, .do, .tool-note, .callout {
  border-left: 4px solid var(--warn-ln); background: var(--warn-bg);
  padding: 13px 16px; border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.5em 0; font-size: 15.5px;
}
.warn strong, .dont strong, .do strong, .tool-note strong, .callout strong {
  display: block; margin-bottom: .3em; font-size: 14px;
  text-transform: uppercase; letter-spacing: .05em;
}
.dont { border-left-color: var(--dont-ln); background: var(--dont-bg); }
.do   { border-left-color: var(--do-ln);   background: var(--do-bg); }
.tool-note { border-left-color: var(--tool-ln); background: var(--tool-bg); }
.callout { border-left-color: var(--accent); background: var(--panel); }

/* ---------- figures ---------- */
.figure { margin: 1.9em 0; }
.figure img { width: 100%; height: auto; display: block;
              border-radius: var(--radius); border: 1px solid var(--line); }
.figure figcaption { font-size: 14px; color: var(--muted); margin-top: .55em;
                     line-height: 1.45; }
.figure figcaption b { color: var(--ink); }
.figrow { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.figrow img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4/3;
              border-radius: var(--radius); border: 1px solid var(--line); display: block; }

/* ---------- tables ---------- */
table { width: 100%; border-collapse: collapse; margin: 1.4em 0; font-size: 15px; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line);
         vertical-align: top; }
th { font-size: 12.5px; text-transform: uppercase; letter-spacing: .05em;
     color: var(--muted); }
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }

/* ---------- cards ---------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; margin: 1.3em 0; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 13px; margin: 1.3em 0; }
.card { background: var(--panel); border: 1px solid var(--line);
        border-radius: var(--radius); padding: 15px; }
.card h3 { margin: 0 0 .35em; font-size: 16.5px; }
.card p { margin: 0; font-size: 14.5px; color: var(--muted); }
.tag { display: inline-block; font-size: 11.5px; text-transform: uppercase;
       letter-spacing: .07em; color: #fff; background: var(--accent2);
       padding: 2px 8px; border-radius: 20px; margin-bottom: .5em; }

/* ---------- table of contents ---------- */
.toc { display: grid; gap: 9px; margin: 1.3em 0; }
.toc a { display: block; text-decoration: none; background: var(--panel);
         border: 1px solid var(--line); border-left: 4px solid var(--accent);
         border-radius: 0 var(--radius) var(--radius) 0; padding: 12px 15px;
         color: var(--ink); }
.toc a:hover { border-left-color: var(--accent2); }
.toc a b { display: block; font-size: 16px; }
.toc a small { color: var(--muted); font-size: 13.5px; }

/* ---------- worksheets ---------- */
.worksheet { background: var(--panel); border: 1px solid var(--line);
             border-radius: var(--radius); padding: 18px; margin: 2em 0; }
.worksheet h3 { margin-top: 0; padding-bottom: .5em; border-bottom: 1px solid var(--line); }
.worksheet label { display: block; font-size: 13.5px; font-weight: 600;
                   color: var(--muted); margin: 12px 0 4px; }
.worksheet input[type=text], .worksheet input[type=number], .worksheet input[type=date],
.worksheet textarea, .worksheet select {
  width: 100%; padding: 9px 10px; border: 1px solid var(--line);
  border-radius: 7px; background: var(--bg); color: var(--ink);
  font: inherit; font-size: 15.5px;
}
.worksheet textarea { min-height: 78px; resize: vertical; }
.worksheet .row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.checks { margin-top: 14px; display: grid; gap: 8px; }
.checks label { display: flex; gap: 9px; align-items: flex-start;
                font-weight: 400; color: var(--ink); font-size: 15px; margin: 0; }
.checks input[type=checkbox] { margin-top: 4px; flex: 0 0 auto;
                               width: 17px; height: 17px; accent-color: var(--accent2); }
.saved-note { font-size: 13px; color: var(--muted); margin-top: 12px; }
.saved-note.flash { color: var(--accent2); font-weight: 600; }

button, .btn {
  font: inherit; font-size: 15px; padding: 9px 15px; border-radius: 8px;
  border: 1px solid var(--accent); background: var(--accent); color: #fff;
  cursor: pointer;
}
button:hover, .btn:hover { filter: brightness(1.07); }
button.secondary, .btn.secondary { background: var(--panel); color: var(--ink);
                                   border-color: var(--line); }
.ws-actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center;
              margin: 1.2em 0; }

/* ---------- tools ---------- */
.tool { background: var(--panel); border: 1px solid var(--line);
        border-radius: var(--radius); padding: 18px; margin: 1.6em 0; }
.tool h3 { margin-top: 0; }
.tool .row-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.tool .row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.tool label { display: block; font-size: 13px; font-weight: 600; color: var(--muted);
              margin: 0 0 4px; }
.tool input, .tool select { width: 100%; padding: 9px 10px; border: 1px solid var(--line);
       border-radius: 7px; background: var(--bg); color: var(--ink); font: inherit; }
.result { margin-top: 15px; padding: 14px; background: var(--bg);
          border: 1px dashed var(--line); border-radius: 8px; font-size: 15.5px; }
.result .big { font-size: 26px; font-weight: 700; color: var(--accent2);
               display: block; line-height: 1.2; }
.result .sub { color: var(--muted); font-size: 14px; }
.result ul { margin: .5em 0 0; padding-left: 1.15em; }

/* ---------- pager ---------- */
.pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 3em;
         border-top: 1px solid var(--line); padding-top: 18px; }
.pager a { text-decoration: none; color: var(--ink); background: var(--panel);
           border: 1px solid var(--line); border-radius: var(--radius);
           padding: 11px 15px; max-width: 49%; }
.pager a small { display: block; color: var(--muted); font-size: 12.5px; }
.pager > span { flex: 1; }

.footnote { margin-top: 3em; padding-top: 16px; border-top: 1px solid var(--line);
            font-size: 13.5px; color: var(--muted); }

/* ---------- phone ---------- */
@media (max-width: 640px) {
  body { font-size: 16.5px; }
  .grid-2, .grid-3, .tool .row-3, .tool .row-2,
  .worksheet .row-2, .figrow { grid-template-columns: 1fr; }
  .topbar { padding: 9px 12px; }
  .topbar nav { margin-left: 0; width: 100%; }
  .wrap { padding: 22px 16px 70px; }
  .pager { flex-direction: column; }
  .pager a { max-width: 100%; }
}

/* ---------- print ---------- */
@media print {
  :root { --bg:#fff; --panel:#fff; --ink:#000; --muted:#444; --line:#bbb; }
  .topbar, .pager, .progress-strip, #storage-warning, .no-print { display: none !important; }
  body { font-size: 11.5pt; }
  .wrap { max-width: none; padding: 0; }
  .figure img { max-height: 3.2in; object-fit: cover; }
  .worksheet, .card, .tool { break-inside: avoid; border: 1px solid #999; }
  h2 { break-after: avoid; }
  a { color: #000; text-decoration: none; }
}

/* month + day, no year */
.md { display: grid; grid-template-columns: 1.6fr 1fr; gap: 8px; }
.track-hint { margin: 10px 0 14px; }
.track-hint:empty { display: none; }
.track-hint .th-row { padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px;
  margin-top: 8px; background: var(--bg); }
.track-hint .th-row.now { border-color: var(--accent2); box-shadow: inset 4px 0 0 var(--accent2); }
.track-hint .th-name { font-weight: 700; }
.track-hint .th-when { display: block; margin-top: 2px; }
.track-hint .th-note { display: block; color: var(--muted); font-size: 14px; }
.track-hint .th-head { color: var(--muted); font-size: 14px; margin: 0; }