/* ============================================================
   RENATA — Guía para docentes
   Sistema de diseño: editorial, sobrio, sin emojis.
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  --font-display: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "Consolas", "Liberation Mono", monospace;

  --ink-900: #13202f;
  --ink-800: #1d2c3d;
  --ink-700: #2c3b4c;
  --ink-500: #4d5a68;
  --ink-400: #6c7785;
  --ink-300: #8b94a0;

  --paper: #fbfaf6;
  --paper-2: #f4f1ea;
  --card: #ffffff;
  --line: #e3dccf;
  --line-strong: #d4cbb9;

  --accent: #0f6b5c;
  --accent-deep: #0a5146;
  --accent-soft: #e6efec;
  --accent-2: #9c7a33;
  --accent-2-soft: #f3ecdd;

  --ok: #2f6b3d;
  --ok-soft: #e9f1ea;
  --warn: #96541c;
  --warn-soft: #f6ede1;
  --danger: #a13a2e;
  --danger-soft: #f6e8e5;

  --radius: 10px;
  --radius-sm: 6px;
  --shadow-1: 0 1px 2px rgba(19, 32, 47, 0.05);
  --shadow-2: 0 6px 24px rgba(19, 32, 47, 0.08);
  --header-h: 60px;
  --sidebar-w: 300px;
  --maxw: 860px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink-700);
  background: var(--paper);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { margin: 0; color: var(--ink-900); font-weight: 600; }
p { margin: 0 0 1.05em; }
a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; }
a:hover { border-bottom-color: currentColor; }
code { font-family: var(--font-mono); font-size: 0.9em; background: var(--paper-2); padding: 0.12em 0.38em; border-radius: 4px; color: var(--ink-800); }
img { max-width: 100%; }
::selection { background: var(--accent-soft); color: var(--accent-deep); }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--accent-deep); color: #fff; padding: 0.6em 1em; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  height: var(--header-h);
  background: rgba(251, 250, 246, 0.92);
  backdrop-filter: saturate(1.2) blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  max-width: 1280px; margin: 0 auto; padding: 0 20px;
  height: 100%; display: flex; align-items: center; gap: 16px;
}
.nav-toggle {
  display: none; width: 40px; height: 40px; border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm); background: var(--card); cursor: pointer;
  flex-direction: column; align-items: center; justify-content: center; gap: 4px;
}
.nav-toggle span { display: block; width: 16px; height: 1.5px; background: var(--ink-700); transition: transform .2s; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 8px; flex: none;
  background: linear-gradient(145deg, var(--accent), var(--accent-deep));
  color: #fff; font-family: var(--font-display); font-weight: 700; font-size: 19px;
  display: grid; place-items: center; letter-spacing: 0.5px;
}
.brand-name { font-family: var(--font-display); font-weight: 700; font-size: 17px; letter-spacing: 2.5px; color: var(--ink-900); }
.brand-sub { color: var(--ink-400); font-size: 12.5px; letter-spacing: 0.4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.header-progress { flex: 1; display: flex; align-items: center; gap: 10px; max-width: 240px; margin-left: auto; }
.header-progress-track { flex: 1; height: 4px; border-radius: 4px; background: var(--line); overflow: hidden; }
.header-progress-fill { height: 100%; width: 0%; background: var(--accent); border-radius: 4px; transition: width .3s; }
.header-progress-label { font-size: 12px; color: var(--ink-400); font-variant-numeric: tabular-nums; min-width: 34px; }

.header-actions { display: flex; align-items: center; gap: 12px; }
.lang-toggle { display: flex; border: 1px solid var(--line-strong); border-radius: var(--radius-sm); overflow: hidden; }
.lang-btn {
  border: 0; background: transparent; font-family: var(--font-body); font-size: 12.5px;
  font-weight: 600; letter-spacing: 0.5px; padding: 6px 12px; cursor: pointer; color: var(--ink-500);
}
.lang-btn.is-active { background: var(--ink-900); color: #fff; }
.print-btn {
  border: 1px solid var(--line-strong); background: var(--card); color: var(--ink-700);
  font-family: var(--font-body); font-size: 12.5px; padding: 6px 12px; border-radius: var(--radius-sm);
  cursor: pointer; letter-spacing: 0.3px;
}
.print-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Layout ---------- */
.layout { display: flex; max-width: 1280px; margin: 0 auto; min-height: calc(100vh - var(--header-h)); }

/* ---------- Sidebar ---------- */
.sidebar {
  width: var(--sidebar-w); flex: none;
  border-right: 1px solid var(--line);
  position: sticky; top: var(--header-h); height: calc(100vh - var(--header-h));
  overflow-y: auto; padding: 22px 18px 30px;
  background: var(--paper);
}
.sidebar-nav { display: flex; flex-direction: column; gap: 2px; }
.nav-part { margin-top: 16px; }
.nav-part:first-child { margin-top: 0; }
.nav-part-title {
  font-size: 11px; text-transform: uppercase; letter-spacing: 1.2px; color: var(--ink-300);
  font-weight: 700; padding: 4px 10px 6px; display: flex; justify-content: space-between; align-items: center;
}
.nav-part-count { font-weight: 600; font-size: 10px; color: var(--accent); }
.nav-item {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 10px; border-radius: 6px; color: var(--ink-500);
  font-size: 13.5px; line-height: 1.35; cursor: pointer; border: 0; background: none; text-align: left; width: 100%;
}
.nav-item:hover { background: var(--paper-2); color: var(--ink-900); }
.nav-item.is-active { background: var(--accent-soft); color: var(--accent-deep); font-weight: 600; }
.nav-item .nav-num { font-size: 11px; font-weight: 700; color: var(--accent); min-width: 16px; }
.nav-item .nav-dot { width: 6px; height: 6px; border-radius: 50%; border: 1px solid var(--line-strong); flex: none; margin-left: auto; }
.nav-item.is-done .nav-dot { background: var(--ok); border-color: var(--ok); }
.nav-item .nav-tag { margin-left: auto; font-size: 9.5px; text-transform: uppercase; letter-spacing: 0.6px; color: var(--ink-300); }
.sidebar-footer { margin-top: 26px; padding: 14px 10px; border-top: 1px solid var(--line); font-size: 12px; color: var(--ink-400); }

/* ---------- Main ---------- */
.main { flex: 1; min-width: 0; padding: 46px 48px 80px; }
.part { max-width: var(--maxw); margin: 0 auto; }

/* ---------- Part header ---------- */
.part-head { margin-bottom: 34px; border-bottom: 1px solid var(--line); padding-bottom: 26px; }
.part-kicker {
  display: flex; align-items: center; gap: 10px; margin-bottom: 14px;
  font-size: 12px; letter-spacing: 1.6px; text-transform: uppercase; color: var(--accent); font-weight: 700;
}
.part-kicker .part-num {
  width: 30px; height: 30px; border-radius: 50%; background: var(--accent-soft); color: var(--accent-deep);
  display: grid; place-items: center; font-size: 13px; font-weight: 700;
}
.part-title { font-family: var(--font-display); font-size: clamp(30px, 4.2vw, 44px); font-weight: 700; line-height: 1.12; letter-spacing: -0.3px; }
.part-audience { margin-top: 12px; font-size: 13px; color: var(--ink-400); letter-spacing: 0.4px; }
.part-intro { margin-top: 18px; font-size: 17.5px; color: var(--ink-500); max-width: 60ch; }

/* ---------- Sections ---------- */
.section { margin-top: 46px; scroll-margin-top: calc(var(--header-h) + 16px); }
.section-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 14px; }
.section-index { font-family: var(--font-mono); font-size: 12px; color: var(--accent); font-weight: 600; white-space: nowrap; }
.section-title { font-family: var(--font-display); font-size: 23px; font-weight: 700; letter-spacing: -0.2px; line-height: 1.3; }
.section-rule { border: 0; height: 1px; background: var(--line); margin: 0 0 20px; }

.prose { font-size: 15.5px; color: var(--ink-700); }
.prose h3 { font-family: var(--font-display); font-size: 17.5px; font-weight: 700; margin: 26px 0 10px; }

/* ---------- Lists ---------- */
.plain-list { margin: 0 0 1.1em; padding: 0; list-style: none; }
.plain-list li { position: relative; padding-left: 22px; margin: 0 0 8px; }
.plain-list li::before {
  content: ""; position: absolute; left: 2px; top: 0.62em;
  width: 7px; height: 7px; border-radius: 2px; background: var(--accent-2);
}

/* ---------- Steps ---------- */
.steps { margin: 0 0 1.2em; padding: 0; list-style: none; counter-reset: step; }
.steps li { position: relative; padding: 0 0 18px 46px; counter-increment: step; }
.steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute; left: 0; top: 0;
  width: 30px; height: 30px; border-radius: 50%;
  border: 1px solid var(--line-strong); background: var(--card);
  color: var(--accent); font-family: var(--font-mono); font-size: 12px; font-weight: 700;
  display: grid; place-items: center;
}
.steps li:not(:last-child)::after {
  content: ""; position: absolute; left: 14.5px; top: 34px; bottom: 2px; width: 1px; background: var(--line);
}
.steps .step-title { font-weight: 700; color: var(--ink-900); display: block; margin-bottom: 2px; }

/* ---------- Callouts ---------- */
.callout { border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; padding: 14px 16px; margin: 0 0 1.2em; background: var(--card); }
.callout .call-title { font-size: 12px; font-weight: 700; letter-spacing: 0.6px; text-transform: uppercase; margin-bottom: 6px; color: var(--accent-deep); }
.callout p:last-child { margin-bottom: 0; }
.callout.info { border-left-color: var(--accent); }
.callout.info .call-title { color: var(--accent-deep); }
.callout.tip { border-left-color: var(--accent-2); }
.callout.tip .call-title { color: var(--accent-2); }
.callout.warn { border-left-color: var(--warn); }
.callout.warn .call-title { color: var(--warn); }
.callout.danger { border-left-color: var(--danger); }
.callout.danger .call-title { color: var(--danger); }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; margin: 0 0 1.2em; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--card); }
table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th { background: var(--paper-2); font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.8px; color: var(--ink-500); font-weight: 700; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: var(--paper); }

/* ---------- Tabs ---------- */
.tabs { margin: 0 0 1.2em; }
.tabs-bar { display: flex; gap: 4px; border-bottom: 1px solid var(--line-strong); flex-wrap: wrap; }
.tab-btn { border: 0; background: none; padding: 9px 14px; font-family: var(--font-body); font-size: 13px; color: var(--ink-500); cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -1px; }
.tab-btn.is-active { color: var(--accent-deep); border-bottom-color: var(--accent); font-weight: 600; }
.tab-panel { padding: 14px 2px 4px; font-size: 15px; color: var(--ink-700); }
.tab-panel[hidden] { display: none; }
.tab-panel p:last-child { margin-bottom: 0; }

/* ---------- Accordion ---------- */
.accordion { margin: 0 0 1.2em; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--card); overflow: hidden; }
.acc-item { border-bottom: 1px solid var(--line); }
.acc-item:last-child { border-bottom: 0; }
.acc-head {
  width: 100%; text-align: left; border: 0; background: none; padding: 13px 16px;
  font-family: var(--font-body); font-size: 14.5px; font-weight: 600; color: var(--ink-900); cursor: pointer;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.acc-head .acc-chev { width: 8px; height: 8px; border-right: 2px solid var(--ink-400); border-bottom: 2px solid var(--ink-400); transform: rotate(45deg); transition: transform .2s; flex: none; }
.acc-item.is-open .acc-chev { transform: rotate(-135deg); }
.acc-body { padding: 0 16px 14px; font-size: 14.5px; color: var(--ink-500); }
.acc-body[hidden] { display: none; }

/* ---------- Mockups ---------- */
.mockup { margin: 0 0 1.2em; border: 1px solid var(--line-strong); border-radius: var(--radius); background: var(--card); box-shadow: var(--shadow-1); overflow: hidden; }
.mockup-bar { display: flex; align-items: center; gap: 8px; padding: 8px 12px; background: var(--paper-2); border-bottom: 1px solid var(--line); }
.mockup-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--line-strong); }
.mockup-dot:first-child { background: #c9beb0; }
.mockup-title { font-size: 11px; color: var(--ink-400); letter-spacing: 0.4px; text-transform: uppercase; }
.mockup-body { padding: 14px; }
.mockup figcaption { padding: 10px 12px; font-size: 12.5px; color: var(--ink-400); border-top: 1px solid var(--line); background: var(--card); }

/* UI element skeletons */
.ui-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.ui-pill { border: 1px solid var(--line-strong); border-radius: 5px; background: var(--card); padding: 5px 10px; font-size: 11.5px; color: var(--ink-500); }
.ui-pill.solid { background: var(--ink-900); color: #fff; border-color: var(--ink-900); }
.ui-pill.accent { background: var(--accent); color: #fff; border-color: var(--accent); }
.ui-pill.ghost { background: var(--paper-2); }
.ui-block { border: 1px dashed var(--line-strong); border-radius: 6px; padding: 10px 12px; background: var(--paper); color: var(--ink-400); font-size: 12px; }
.ui-label { font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.8px; color: var(--ink-300); font-weight: 700; margin-bottom: 6px; display: block; }
.mk-col { display: flex; gap: 10px; }
.mk-col > * { flex: 1; min-width: 0; }
.mk-grid { display: grid; gap: 10px; }
.mk-grid.c2 { grid-template-columns: 1fr 1fr; }
.mk-grid.c3 { grid-template-columns: repeat(3, 1fr); }
.mk-card { border: 1px solid var(--line); border-radius: 8px; padding: 12px; background: var(--card); }
.mk-card .mk-card-title { font-size: 12.5px; font-weight: 700; color: var(--ink-900); margin-bottom: 4px; }
.mk-card .mk-card-sub { font-size: 11px; color: var(--ink-400); }
.mk-bar { height: 6px; border-radius: 6px; background: var(--line); overflow: hidden; }
.mk-bar > i { display: block; height: 100%; background: var(--accent); border-radius: 6px; }
.mk-week { display: grid; grid-template-columns: repeat(12, 1fr); gap: 4px; }
.mk-week i { height: 14px; border-radius: 3px; background: var(--line); }
.mk-week i.on { background: var(--ok); }
.mk-week i.cur { background: var(--accent-2); }
.mk-chat { display: flex; flex-direction: column; gap: 8px; }
.mk-bubble { max-width: 78%; border-radius: 10px; padding: 8px 12px; font-size: 12px; line-height: 1.45; }
.mk-bubble.me { align-self: flex-start; background: var(--paper-2); color: var(--ink-700); }
.mk-bubble.you { align-self: flex-end; background: var(--accent-soft); color: var(--accent-deep); }
.mk-caret { display: inline-block; width: 2px; height: 14px; background: var(--accent); vertical-align: text-bottom; animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.mk-table { width: 100%; font-size: 11px; border-collapse: collapse; }
.mk-table th, .mk-table td { padding: 6px 8px; border: 1px solid var(--line); }
.mk-table thead th { background: var(--paper-2); }
.mk-progress { display: flex; align-items: center; gap: 10px; font-size: 12px; color: var(--ink-500); }

/* ---------- CTA ---------- */
.cta {
  margin: 26px 0; padding: 18px 20px; border-radius: var(--radius);
  background: linear-gradient(120deg, var(--accent-deep), var(--accent));
  color: #fff; display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}
.cta .cta-text { font-size: 15.5px; font-weight: 600; }
.cta .cta-sub { font-size: 13px; opacity: 0.85; }

/* ---------- Botón marcar sección ---------- */
.sec-done {
  margin-left: auto; width: 28px; height: 28px; border-radius: 50%; flex: none;
  border: 1.5px solid var(--line-strong); background: var(--card); cursor: pointer;
  display: grid; place-items: center; color: transparent; padding: 0;
  transition: background .2s, border-color .2s;
}
.sec-done:hover { border-color: var(--accent); }
.sec-done.is-done { background: var(--ok); border-color: var(--ok); color: #fff; }
.sec-done::after {
  content: ""; width: 8px; height: 4px;
  border-left: 2px solid currentColor; border-bottom: 2px solid currentColor;
  transform: rotate(-45deg) translateY(-1px);
}

/* ---------- Líneas de esqueleto (mockups) ---------- */
.mk-line { height: 7px; border-radius: 7px; background: var(--line); }
.mk-line.w { width: 60%; }
.mk-line.m { width: 40%; }

/* ---------- Volver al inicio ---------- */
.back-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 60;
  width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--line-strong);
  background: var(--card); color: var(--accent); font-size: 18px; cursor: pointer;
  box-shadow: var(--shadow-2); opacity: 0; pointer-events: none; transform: translateY(8px);
  transition: opacity .25s, transform .25s;
}
.back-top.is-visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-top:hover { border-color: var(--accent); }

/* ---------- Part divider ---------- */
.part-divider { display: none; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); background: var(--paper); }
.footer-inner { max-width: var(--maxw); margin: 0 auto; padding: 26px 20px; text-align: center; }
.footer-brand { font-family: var(--font-display); font-weight: 700; color: var(--ink-900); letter-spacing: 0.5px; margin-bottom: 4px; }
.footer-note { font-size: 12.5px; color: var(--ink-400); }

/* ---------- Scrim (mobile) ---------- */
.scrim { position: fixed; inset: 0; background: rgba(19, 32, 47, 0.4); z-index: 40; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .nav-toggle { display: flex; }
  .brand-sub { display: none; }
  .header-progress { max-width: 120px; }
  .sidebar {
    position: fixed; top: var(--header-h); left: 0; bottom: 0; z-index: 45;
    transform: translateX(-100%); transition: transform .25s ease; width: 300px; max-width: 84vw;
    background: var(--paper); box-shadow: var(--shadow-2);
  }
  .sidebar.is-open { transform: translateX(0); }
  .main { padding: 32px 22px 70px; }
  .mk-grid.c3 { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  body { font-size: 15.5px; }
  .print-btn { display: none; }
  .mk-grid.c2 { grid-template-columns: 1fr; }
  .mk-col { flex-direction: column; }
}

/* ---------- Print ---------- */
@media print {
  .site-header, .sidebar, .scrim, .skip-link, .print-btn, .nav-toggle { display: none !important; }
  body { background: #fff; color: #000; }
  .main { padding: 0; }
  .part { max-width: none; }
  .layout { display: block; }
  .section { page-break-inside: avoid; }
  .mockup { box-shadow: none; }
  a { color: #000; border: 0; }
}