/* Layout: una columna de estudio (máx. 920px) con barra de secciones fija arriba; la consola y la memoria
   del intérprete son las únicas superficies "oscuras" de la página, como una terminal dentro del cuaderno. */
:root {
  --bg: #eef2f5;
  --surface: #ffffff;
  --surface-2: #f5f8fa;
  --ink: #142230;
  --muted: #566573;
  --line: #d3dce4;
  --accent: #2a5d8f;
  --accent-soft: #dce8f3;
  --accent-ink: #ffffff;
  --mark: #f3c34a;
  --mark-soft: #fbefcb;
  --ok: #2c7a4d;
  --ok-soft: #dcefe3;
  --bad: #b2402c;
  --bad-soft: #f6e0db;
  --term-bg: #13202c;
  --term-ink: #dfe8ef;
  --term-muted: #8aa0b2;
  --term-line: #26384a;
  --f-display: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --f-body: "Atkinson Hyperlegible", "Segoe UI", system-ui, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, "Cascadia Code", Consolas, monospace;
  --r: 10px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e151c; --surface: #16212b; --surface-2: #1b2833; --ink: #e3eaf0; --muted: #98a8b6; --line: #2a3a48;
    --accent: #7db0e0; --accent-soft: #1d3346; --accent-ink: #0e151c; --mark: #e7b83f; --mark-soft: #3a3220;
    --ok: #6cc28f; --ok-soft: #173326; --bad: #ec8a76; --bad-soft: #3d221d;
    --term-bg: #0a1117; --term-ink: #dfe8ef; --term-muted: #7f95a7; --term-line: #22313f;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0e151c; --surface: #16212b; --surface-2: #1b2833; --ink: #e3eaf0; --muted: #98a8b6; --line: #2a3a48;
  --accent: #7db0e0; --accent-soft: #1d3346; --accent-ink: #0e151c; --mark: #e7b83f; --mark-soft: #3a3220;
  --ok: #6cc28f; --ok-soft: #173326; --bad: #ec8a76; --bad-soft: #3d221d;
  --term-bg: #0a1117; --term-ink: #dfe8ef; --term-muted: #7f95a7; --term-line: #22313f;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 64px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; animation: none !important; } }
body { background: var(--bg); color: var(--ink); font-family: var(--f-body); font-size: 17px; line-height: 1.6; }
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 30; background: var(--surface); }
.wrap { max-width: 920px; margin: 0 auto; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
h1, h2, h3 { font-family: var(--f-display); line-height: 1.15; text-wrap: balance; margin: 0; }
h2 { font-size: clamp(1.5rem, 3.4vw, 2rem); font-weight: 700; letter-spacing: -0.01em; }
h3 { font-size: 1.2rem; font-weight: 700; }
p { margin: 0; max-width: 68ch; }
a { color: var(--accent); }
code, pre, textarea.code, .mono { font-family: var(--f-mono); font-size: 0.86em; }
:not(pre) > code { background: var(--accent-soft); padding: 0.08em 0.35em; border-radius: 5px; }
.eyebrow { font-family: var(--f-mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.muted { color: var(--muted); }
button, .btn { font: inherit; font-size: 0.92rem; font-weight: 700; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); padding: 0.5em 0.95em; cursor: pointer; display: inline-flex; align-items: center; gap: 0.4em; text-decoration: none; min-height: 40px; }
button:hover, .btn:hover { border-color: var(--accent); }
button:focus-visible, .btn:focus-visible, textarea:focus-visible, input:focus-visible, summary:focus-visible { outline: 3px solid var(--mark); outline-offset: 2px; }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
button.ghost { background: transparent; }
button:disabled { opacity: 0.5; cursor: not-allowed; }
input[type="date"], input[type="text"] { font: inherit; padding: 0.4em 0.6em; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); }

/* barra superior */
.topbar { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20; background: var(--surface); border-bottom: 1px solid var(--line); }
.topbar .wrap { display: flex; align-items: center; gap: 14px; min-height: 54px; }
.brand { font-family: var(--f-display); font-weight: 800; font-size: 1.05rem; white-space: nowrap; display: flex; align-items: center; gap: 8px; }
.brand .prompt { font-family: var(--f-mono); color: var(--accent); font-weight: 600; }
.nav { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; flex: 1; min-width: 0; }
.nav::-webkit-scrollbar { display: none; }
.nav a { white-space: nowrap; text-decoration: none; color: var(--muted); font-size: 0.88rem; font-weight: 700; padding: 6px 10px; border-radius: 6px; }
.nav a:hover { color: var(--ink); background: var(--surface-2); }

section.block { padding-block: 44px 8px; display: grid; gap: 18px; }
.lead { font-size: 1.08rem; color: var(--muted); }

/* hero */
.hero { padding-block: 34px 6px; display: grid; gap: 14px; }
.hero h1 { font-size: clamp(2rem, 5.6vw, 3.2rem); font-weight: 800; letter-spacing: -0.02em; }
.hero h1 .day { color: var(--accent); }
.goals { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 10px; margin: 6px 0 0; padding: 0; list-style: none; }
.goals li { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 10px 12px; font-size: 0.93rem; }
.goals li b { display: block; font-family: var(--f-mono); font-size: 0.72rem; color: var(--accent); letter-spacing: 0.06em; text-transform: uppercase; }
.meta-row { display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center; font-size: 0.92rem; color: var(--muted); }
.sync { display: inline-flex; gap: 6px; align-items: center; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); display: inline-block; }
.dot.on { background: var(--ok); }
.dot.warn { background: var(--mark); }

/* calendario */
.cal { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 18px; display: grid; gap: 16px; }
.today { display: grid; grid-template-columns: auto 1fr; gap: 16px; align-items: center; }
.datebox { width: 74px; text-align: center; border: 2px solid var(--ink); border-radius: 10px; overflow: hidden; }
.datebox .m { background: var(--ink); color: var(--surface); font-family: var(--f-mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; padding: 2px 0; }
.datebox .d { font-family: var(--f-display); font-size: 2rem; font-weight: 800; line-height: 1.2; }
.datebox .w { font-size: 0.72rem; color: var(--muted); padding-bottom: 4px; }
.today-text { display: grid; gap: 4px; min-width: 0; }
.today-text .what { font-family: var(--f-display); font-size: 1.25rem; font-weight: 700; }
.strip { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 6px; }
.cell { border: 1px solid var(--line); border-radius: 8px; padding: 6px 6px 8px; min-height: 78px; font-size: 0.74rem; display: grid; align-content: start; gap: 3px; background: var(--surface-2); min-width: 0; }
.cell .dn { font-family: var(--f-mono); color: var(--muted); font-size: 0.7rem; }
.cell .lbl { font-weight: 700; line-height: 1.25; overflow-wrap: anywhere; }
.cell.is-today { border: 2px solid var(--accent); background: var(--accent-soft); }
.cell.rest { opacity: 0.6; }
.cell.done .lbl::before { content: "✓ "; color: var(--ok); }
.cell.taller .lbl { color: var(--accent); }
.cal details { border-top: 1px solid var(--line); padding-top: 12px; }
.cal summary { cursor: pointer; font-weight: 700; font-size: 0.92rem; }
.cal-settings { display: flex; flex-wrap: wrap; gap: 14px 22px; align-items: center; margin-top: 12px; font-size: 0.92rem; }
.daypick { display: flex; gap: 4px; flex-wrap: wrap; }
.daypick label { display: inline-flex; align-items: center; justify-content: center; width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 8px; cursor: pointer; font-weight: 700; font-size: 0.85rem; }
.daypick input { position: absolute; opacity: 0; pointer-events: none; }
.daypick input:checked + span { color: var(--accent-ink); }
.daypick label:has(input:checked) { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.daypick label:has(input:focus-visible) { outline: 3px solid var(--mark); outline-offset: 2px; }
@media (max-width: 560px) {
  .strip { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .strip .cell:nth-child(n+9) { display: none; }
}

/* algoritmo */
.algo { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.algo-head, .algo-row { display: grid; grid-template-columns: 170px minmax(0, 1fr) minmax(0, 1.3fr); }
.algo-head > div { padding: 8px 14px; font-family: var(--f-mono); font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); border-bottom: 1px solid var(--line); }
.algo-row { cursor: pointer; border-bottom: 1px solid var(--line); }
.algo-row:last-child { border-bottom: 0; }
.algo-row > div { padding: 10px 14px; display: flex; align-items: center; min-width: 0; }
.algo-row > .flowcol { justify-content: center; }
.algo-row.hot { background: var(--mark-soft); }
.algo-row code { background: none; padding: 0; overflow-wrap: anywhere; }
.shape { display: inline-flex; align-items: center; justify-content: center; font-size: 0.78rem; font-weight: 700; height: 34px; padding: 0 14px; border: 2px solid var(--ink); background: var(--surface); position: relative; }
.shape.oval { border-radius: 999px; }
.shape.io { transform: skewX(-14deg); }
.shape.io span { transform: skewX(14deg); }
.shape.proc { border-radius: 2px; }
.flowcol { position: relative; }
.algo-row:not(:last-child) .flowcol::after { content: ""; position: absolute; left: calc(50% - 1px); bottom: -6px; width: 2px; height: 14px; background: var(--ink); z-index: 1; }
.legend { display: flex; flex-wrap: wrap; gap: 14px; font-size: 0.85rem; color: var(--muted); align-items: center; }
.legend .shape { height: 24px; padding: 0 10px; font-size: 0.7rem; }
@media (max-width: 640px) {
  .algo-head { display: none; }
  .algo-row { grid-template-columns: 1fr; }
  .algo-row > div { padding: 6px 14px; }
  .algo-row > div:first-child { padding-top: 12px; }
  .algo-row > div:last-child { padding-bottom: 12px; }
  .algo-row:not(:last-child) .flowcol::after { display: none; }
}

/* visualizador */
.viz { background: var(--term-bg); color: var(--term-ink); border-radius: 14px; overflow: hidden; display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); }
.viz .pane { padding: 16px; min-width: 0; }
.viz .pane + .pane { border-left: 1px solid var(--term-line); }
.viz .label { font-family: var(--f-mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--term-muted); margin-bottom: 8px; }
.src { font-family: var(--f-mono); font-size: 0.86rem; margin: 0; display: grid; overflow-x: auto; }
.src .ln { display: grid; grid-template-columns: 2.2em 1.4em 1fr; padding: 3px 4px; border-radius: 4px; white-space: pre; }
.src .ln .n { color: var(--term-muted); text-align: right; padding-right: 8px; }
.src .ln .arrow { color: var(--mark); visibility: hidden; }
.src .ln.cur { background: rgba(243, 195, 74, 0.16); }
.src .ln.cur .arrow { visibility: visible; }
.src .ln.past { color: var(--term-muted); }
.mem { display: grid; gap: 6px; min-height: 120px; align-content: start; }
.var { display: grid; grid-template-columns: minmax(0, auto) 1fr auto; gap: 8px; align-items: center; border: 1px solid var(--term-line); border-radius: 6px; padding: 6px 8px; font-family: var(--f-mono); font-size: 0.82rem; }
.var .vn { color: var(--term-muted); }
.var .vv { font-weight: 600; overflow-wrap: anywhere; }
.var .vt { font-size: 0.68rem; padding: 1px 6px; border-radius: 999px; background: var(--term-line); }
.var.changed { border-color: var(--mark); animation: pulse 0.6s ease; }
@keyframes pulse { from { background: rgba(243, 195, 74, 0.3); } to { background: transparent; } }
.console { font-family: var(--f-mono); font-size: 0.84rem; background: #0000; border-top: 1px dashed var(--term-line); margin-top: 12px; padding-top: 10px; min-height: 44px; white-space: pre-wrap; }
.viz-foot { grid-column: 1 / -1; border-top: 1px solid var(--term-line); padding: 14px 16px; display: grid; gap: 12px; }
.viz-note { font-size: 0.95rem; min-height: 3.2em; }
.viz-ctl { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.viz-ctl button { background: transparent; color: var(--term-ink); border-color: var(--term-line); }
.viz-ctl button.primary { background: var(--mark); color: #1c1606; border-color: var(--mark); }
.viz-ctl .count { font-family: var(--f-mono); font-size: 0.8rem; color: var(--term-muted); margin-left: auto; }
@media (max-width: 680px) { .viz { grid-template-columns: 1fr; } .viz .pane + .pane { border-left: 0; border-top: 1px solid var(--term-line); } }

/* conceptos */
.concepts { display: grid; gap: 18px; }
.concept { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 18px; display: grid; gap: 12px; min-width: 0; }
.concept .num { font-family: var(--f-mono); color: var(--accent); font-size: 0.78rem; font-weight: 600; }
.tbl-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
th, td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-family: var(--f-mono); font-size: 0.7rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
td code { white-space: nowrap; }
.callout { border-left: 4px solid var(--mark); background: var(--mark-soft); padding: 10px 14px; border-radius: 0 8px 8px 0; font-size: 0.95rem; }

/* editor */
.editor { border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: var(--surface); }
.editor-bar { display: flex; align-items: center; gap: 8px; padding: 6px 8px 6px 12px; background: var(--surface-2); border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.editor-bar .file { font-family: var(--f-mono); font-size: 0.78rem; color: var(--muted); margin-right: auto; }
.editor-bar button { min-height: 34px; padding: 0.3em 0.8em; font-size: 0.85rem; }
textarea.code { display: block; width: 100%; border: 0; resize: vertical; padding: 12px 14px; background: var(--surface); color: var(--ink); line-height: 1.55; tab-size: 4; min-height: 120px; font-size: 0.88rem; }
textarea.code:focus { outline: none; }
.inputs-row { display: flex; gap: 8px; align-items: center; padding: 8px 12px; border-top: 1px solid var(--line); background: var(--surface-2); font-size: 0.85rem; flex-wrap: wrap; }
.inputs-row input { flex: 1; min-width: 160px; font-family: var(--f-mono); font-size: 0.84rem; }
.out { background: var(--term-bg); color: var(--term-ink); font-family: var(--f-mono); font-size: 0.84rem; padding: 10px 14px; white-space: pre-wrap; min-height: 2.6em; overflow-x: auto; }
.out .err { color: #ff9c87; }
.out .hint { color: var(--mark); }
.out .dim { color: var(--term-muted); }

/* ejercicios */
.ex { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; display: grid; min-width: 0; }
.ex-head { padding: 18px 18px 0; display: grid; gap: 8px; }
.ex-title { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 12px; }
.ex-title h3 { font-size: 1.3rem; }
.chip { display: inline-flex; align-items: center; gap: 4px; font-size: 0.74rem; font-weight: 700; padding: 2px 9px; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--line); color: var(--muted); white-space: nowrap; }
.chip.ok { background: var(--ok-soft); color: var(--ok); border-color: transparent; }
.chip.reto { background: var(--mark-soft); color: var(--ink); border-color: transparent; }
.ex-body { padding: 14px 18px 18px; display: grid; gap: 14px; }
.fmt { font-family: var(--f-mono); font-size: 0.86rem; background: var(--surface-2); border: 1px dashed var(--line); border-radius: 8px; padding: 10px 12px; white-space: pre-wrap; overflow-x: auto; }
.sample { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); gap: 10px; font-size: 0.86rem; }
.sample > div { min-width: 0; }
.sample .mono { white-space: pre-wrap; background: var(--surface-2); border-radius: 8px; padding: 8px 10px; overflow-x: auto; }
@media (max-width: 560px) { .sample { grid-template-columns: 1fr; } }
.ex-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.result { border: 1px solid var(--line); border-radius: 12px; padding: 14px; display: grid; gap: 12px; background: var(--surface-2); }
.score { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.ring { --p: 0; --c: var(--accent); width: 76px; height: 76px; border-radius: 50%; display: grid; place-items: center; background: conic-gradient(var(--c) calc(var(--p) * 1%), var(--line) 0); flex: none; }
.ring span { width: 60px; height: 60px; border-radius: 50%; background: var(--surface-2); display: grid; place-items: center; font-family: var(--f-display); font-weight: 800; font-size: 1.35rem; font-variant-numeric: tabular-nums; }
.score .split { display: grid; gap: 4px; font-size: 0.9rem; }
.bar { height: 6px; border-radius: 3px; background: var(--line); overflow: hidden; width: 160px; }
.bar i { display: block; height: 100%; background: var(--accent); }
.checks { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; font-size: 0.92rem; }
.checks li { display: grid; grid-template-columns: 22px 1fr; gap: 6px; align-items: start; }
.checks .k { font-weight: 800; }
.checks .k.ok { color: var(--ok); }
.checks .k.bad { color: var(--bad); }
.checks .k.warn { color: var(--mark); }
.diff { font-family: var(--f-mono); font-size: 0.8rem; display: grid; gap: 2px; margin-top: 4px; overflow-x: auto; }
.diff .e { color: var(--ok); }
.diff .o { color: var(--bad); }
.ai { border: 1px solid var(--accent); border-radius: 12px; padding: 14px; display: grid; gap: 10px; background: var(--surface); }
.ai-head { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 0.92rem; }
.ai-badge { font-family: var(--f-mono); font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase; background: var(--accent); color: var(--accent-ink); padding: 2px 7px; border-radius: 5px; }
.ai-text { font-size: 0.96rem; display: grid; gap: 8px; }
.ai-text pre { background: var(--surface-2); padding: 8px 10px; border-radius: 8px; overflow-x: auto; margin: 0; }
.ai-text ul { margin: 0; padding-left: 1.2em; }
.thinking { color: var(--muted); font-style: italic; }
.hints { display: grid; gap: 8px; }
.hint-item { border-left: 3px solid var(--mark); padding: 6px 12px; background: var(--mark-soft); border-radius: 0 8px 8px 0; font-size: 0.94rem; }
.hint-item b { font-family: var(--f-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; display: block; }
.gate { border: 1px dashed var(--line); border-radius: 12px; padding: 12px 14px; display: grid; gap: 8px; font-size: 0.92rem; }
.gate-steps { display: flex; gap: 14px; flex-wrap: wrap; font-family: var(--f-mono); font-size: 0.8rem; }
.gate-steps span.met { color: var(--ok); }
.solution pre { background: var(--term-bg); color: var(--term-ink); padding: 12px 14px; border-radius: 10px; overflow-x: auto; margin: 0; font-size: 0.86rem; }
.solution { display: grid; gap: 10px; }

/* quiz */
.quiz { display: grid; gap: 14px; }
.q { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; display: grid; gap: 10px; }
.q pre { background: var(--term-bg); color: var(--term-ink); padding: 10px 12px; border-radius: 8px; margin: 0; overflow-x: auto; font-size: 0.86rem; }
.opts { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 8px; }
.opts button { justify-content: flex-start; font-family: var(--f-mono); font-weight: 600; text-align: left; }
.opts button:disabled { opacity: 1; cursor: default; color: var(--muted); }
.opts button.right, .opts button.right:disabled { background: var(--ok-soft); border-color: var(--ok); color: var(--ok); }
.opts button.wrong, .opts button.wrong:disabled { background: var(--bad-soft); border-color: var(--bad); color: var(--bad); }
.q .why { font-size: 0.93rem; }
.quiz-score { font-family: var(--f-display); font-weight: 700; font-size: 1.1rem; }

/* ruta */
.thread { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 18px; display: grid; gap: 12px; }
.thread ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.thread li { display: grid; grid-template-columns: 74px 1fr; gap: 12px; padding: 8px 0; border-bottom: 1px dashed var(--line); font-size: 0.93rem; }
.thread li:last-child { border-bottom: 0; }
.thread li .wk { font-family: var(--f-mono); font-size: 0.74rem; color: var(--accent); font-weight: 600; padding-top: 2px; }
.phases { display: grid; gap: 10px; }
.phase { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; }
.phase summary { list-style: none; cursor: pointer; padding: 14px 16px; display: grid; grid-template-columns: 86px 1fr auto; gap: 12px; align-items: center; }
.phase summary::-webkit-details-marker { display: none; }
.phase summary .wk { font-family: var(--f-mono); font-size: 0.75rem; color: var(--muted); }
.phase summary .t { font-family: var(--f-display); font-weight: 700; font-size: 1.08rem; }
.phase summary .t small { display: block; font-family: var(--f-body); font-weight: 400; font-size: 0.85rem; color: var(--muted); }
.phase summary .plus { font-family: var(--f-mono); color: var(--muted); }
.phase[open] summary .plus { transform: rotate(45deg); }
.phase.now { border-color: var(--accent); }
.phase-body { padding: 0 16px 16px; display: grid; gap: 12px; }
.days { display: grid; gap: 0; }
.dayrow { display: grid; grid-template-columns: 44px minmax(0, 1fr) minmax(0, 1fr); gap: 12px; padding: 8px 0; border-top: 1px solid var(--line); font-size: 0.9rem; }
.dayrow .dl { font-family: var(--f-mono); font-size: 0.75rem; color: var(--muted); padding-top: 2px; }
.dayrow .rt { color: var(--muted); }
.dayrow .rt b { color: var(--ink); font-weight: 700; font-size: 0.78rem; font-family: var(--f-mono); text-transform: uppercase; letter-spacing: 0.04em; }
@media (max-width: 600px) { .dayrow { grid-template-columns: 44px 1fr; } .dayrow .rt { grid-column: 2; } .phase summary { grid-template-columns: 1fr auto; } .phase summary .wk { grid-column: 1 / -1; } }
.tools { display: flex; flex-wrap: wrap; gap: 6px; }

/* tutor */
.tutor { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 18px; display: grid; gap: 12px; }
.chat { display: grid; gap: 10px; max-height: 460px; overflow-y: auto; }
.msg { padding: 10px 14px; border-radius: 12px; font-size: 0.95rem; max-width: 90%; display: grid; gap: 6px; }
.msg.me { background: var(--accent-soft); justify-self: end; }
.msg.bot { background: var(--surface-2); border: 1px solid var(--line); justify-self: start; }
.chat-form { display: flex; gap: 8px; align-items: flex-end; }
.chat-form textarea { flex: 1; font: inherit; font-size: 0.95rem; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--ink); resize: vertical; min-height: 46px; min-width: 0; }

/* kit */
.steps { counter-reset: s; display: grid; gap: 10px; list-style: none; margin: 0; padding: 0; }
.steps li { counter-increment: s; display: grid; grid-template-columns: 34px 1fr; gap: 10px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; min-width: 0; }
.steps li::before { content: counter(s); font-family: var(--f-display); font-weight: 800; color: var(--accent); font-size: 1.3rem; line-height: 1.2; }
.steps li > div { min-width: 0; display: grid; gap: 6px; }
.steps pre { background: var(--term-bg); color: var(--term-ink); padding: 8px 12px; border-radius: 8px; margin: 0; overflow-x: auto; font-size: 0.84rem; }
.resources { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 10px; }
.res { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 14px; display: grid; gap: 6px; text-decoration: none; color: var(--ink); }
.res:hover { border-color: var(--accent); }
.res b { font-family: var(--f-display); font-size: 1.02rem; }
.res span { font-size: 0.88rem; color: var(--muted); }
footer { padding-block: 40px 60px; color: var(--muted); font-size: 0.85rem; }
.toast { position: fixed; left: 50%; transform: translateX(-50%); bottom: calc(16px + env(safe-area-inset-bottom, 0px)); background: var(--ink); color: var(--surface); padding: 10px 16px; border-radius: 10px; font-size: 0.9rem; z-index: 40; max-width: calc(100% - 32px); }

/* ===================== app (servidor) ===================== */
html, body { margin: 0; }
:root { padding-top: env(safe-area-inset-top, 0px); padding-bottom: env(safe-area-inset-bottom, 0px); }
[hidden] { display: none !important; }
img { max-width: 100%; }
.topbar .actions { display: flex; gap: 6px; align-items: center; }
.topbar .actions button { min-height: 34px; padding: 0.3em 0.7em; font-size: 0.82rem; }
.back { text-decoration: none; color: var(--muted); font-weight: 700; font-size: 0.9rem; display: inline-flex; gap: 6px; align-items: center; padding-top: 18px; }
.loading { padding: 60px 0; text-align: center; color: var(--muted); }

/* login */
.login { min-height: 100vh; min-height: 100dvh; display: grid; place-items: center; padding: 24px max(16px, env(safe-area-inset-right, 0px)) 24px max(16px, env(safe-area-inset-left, 0px)); }
.login form { width: 100%; max-width: 360px; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 28px 24px; display: grid; gap: 14px; }
.login h1 { font-size: 1.8rem; font-weight: 800; }
.login h1 span { font-family: var(--f-mono); color: var(--accent); font-size: 1.2rem; display: block; }
.login label { display: grid; gap: 6px; font-weight: 700; font-size: 0.9rem; }
.login input { font: inherit; padding: 0.65em 0.8em; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); }
.login .err { color: var(--bad); font-size: 0.9rem; min-height: 1.3em; }
.login button { justify-content: center; }

/* mapa de módulos */
.map { display: grid; gap: 14px; }
.week { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px; display: grid; gap: 10px; }
.week-head { display: flex; justify-content: space-between; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.week-head h3 { font-size: 1.05rem; }
.week-head .muted { font-size: 0.82rem; font-family: var(--f-mono); }
.daygrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 8px; }
.daycard { border: 1px solid var(--line); border-radius: 10px; padding: 10px; display: grid; gap: 4px; text-decoration: none; color: var(--ink); background: var(--surface-2); min-width: 0; font-size: 0.86rem; }
.daycard .k { font-family: var(--f-mono); font-size: 0.7rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; display: flex; justify-content: space-between; gap: 6px; }
.daycard b { line-height: 1.25; overflow-wrap: anywhere; }
.daycard .p { font-size: 0.76rem; color: var(--muted); }
.daycard.open { background: var(--surface); border-color: var(--accent); }
.daycard.open:hover { background: var(--accent-soft); }
.daycard.done { border-color: var(--ok); }
.daycard.done .k span:last-child { color: var(--ok); }
.daycard.locked, .daycard.soon { opacity: 0.55; pointer-events: none; }
.meter { height: 4px; border-radius: 2px; background: var(--line); overflow: hidden; }
.meter i { display: block; height: 100%; background: var(--ok); }
.continue { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.retoma { border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; background: var(--surface); font-size: 0.93rem; display: grid; gap: 6px; }
.retoma ul { margin: 0; padding-left: 1.2em; }
.banner { border-radius: 12px; padding: 12px 14px; font-size: 0.93rem; }
.banner.ok { background: var(--ok-soft); color: var(--ink); border: 1px solid var(--ok); }
.banner.warn { background: var(--mark-soft); border: 1px solid var(--mark); }
.offline { position: fixed; top: calc(env(safe-area-inset-top, 0px) + 60px); left: 50%; transform: translateX(-50%); background: var(--bad); color: #fff; padding: 6px 14px; border-radius: 999px; font-size: 0.82rem; z-index: 50; }
@media (max-width: 520px) { .topbar .nav { display: none; } .topbar .wrap { justify-content: space-between; } }