/* =========================================================
   Módulo 094 · Verificación y validación de la solución software
   Hoja de estilos compartida por todas las páginas del sitio.
   index.html es la Clase 1 (punto de entrada del sitio); clase2.html,
   clase3.html, etc. son las siguientes clases.
   ========================================================= */

:root{
  --ink:#1b2430;
  --ink-soft:#4a5568;
  --paper:#f6f7fb;
  --card:#ffffff;
  --line:#e2e5ec;
  --brand:#01195f;
  --brand-2:#022eb0;
  --accent:#f7780a;
  --accent-soft:#fef4eb;
  --good:#2f7d4f;
  --good-soft:#eaf6ee;
  --bad:#b23a34;
  --bad-soft:#fbeceb;
  --tool:#022eb0;
  --tool-soft:#ebedf2;
  --lock:#9aa5b1;
  --radius:14px;
}
*{box-sizing:border-box;}
html,body{height:100%;}
body{
  margin:0;
  font-family:'Segoe UI', system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  color:var(--ink);
  background:var(--paper);
  line-height:1.55;
}
a{color:var(--brand-2);}

/* ---------- HEADER ---------- */
header.top{
  background:linear-gradient(135deg, var(--brand) 0%, #16283f 100%);
  color:#fff;
  padding:22px 24px 0;
}
.brand-row{
  display:flex;
  align-items:center;
  gap:16px;
  flex-wrap:wrap;
}
.brand-logo{
  flex:0 0 auto;
  height:46px;
  width:auto;
  background:#fff;
  padding:6px 12px;
  border-radius:8px;
}
header.top .eyebrow{
  text-transform:uppercase;
  letter-spacing:.13em;
  font-size:.68rem;
  color:#a9c1d8;
  margin-bottom:6px;
}
header.top h1{
  margin:0;
  font-size:1.32rem;
  line-height:1.3;
  font-weight:700;
}
header.top .sub{
  color:#cfe0ef;
  font-size:.9rem;
  margin-top:4px;
}

/* ---------- TOP NAV ---------- */
.top-nav{
  display:flex;
  align-items:stretch;
  flex-wrap:wrap;
  gap:4px;
  margin-top:18px;
  padding:0 24px;
  border-top:1px solid rgba(255,255,255,.12);
}
.top-nav a{
  color:#a9c1d8;
  text-decoration:none;
  font-size:.86rem;
  font-weight:600;
  padding:12px 18px 10px;
  border-bottom:3px solid transparent;
  white-space:nowrap;
}
.top-nav a:hover{color:#fff;}
.top-nav a.active{
  color:#fff;
  border-bottom-color:var(--accent);
}
.top-nav a.disabled{
  color:#5c7186;
  pointer-events:none;
}

/* ---------- NAV DROPDOWN (Fase 1 -> Clase 1/2/3) ---------- */
.nav-dropdown{position:relative;}
.nav-dropdown-trigger{
  font-family:inherit;
  background:none;
  border:none;
  color:#a9c1d8;
  font-size:.86rem;
  font-weight:600;
  padding:12px 18px 10px;
  border-bottom:3px solid transparent;
  white-space:nowrap;
  cursor:pointer;
}
.nav-dropdown-trigger::after{content:" ▾"; opacity:.7; font-size:.75em;}
.nav-dropdown-trigger:hover{color:#fff;}
.nav-dropdown.active .nav-dropdown-trigger{
  color:#fff;
  border-bottom-color:var(--accent);
}
.nav-dropdown-menu{
  display:none;
  position:absolute;
  top:100%;
  left:0;
  min-width:170px;
  background:#16283f;
  border:1px solid rgba(255,255,255,.15);
  border-radius:0 0 10px 10px;
  box-shadow:0 12px 26px rgba(0,0,0,.3);
  z-index:30;
  overflow:hidden;
}
.nav-dropdown-menu a{
  display:block;
  padding:11px 18px;
  border-bottom:1px solid rgba(255,255,255,.08);
  color:#cfe0ef;
}
.nav-dropdown-menu a:last-child{border-bottom:none;}
.nav-dropdown-menu a:hover{background:rgba(255,255,255,.08); color:#fff;}
.nav-dropdown-menu a.active{background:rgba(255,255,255,.12); color:#fff; border-bottom-color:transparent;}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.open .nav-dropdown-menu{display:block;}

/* Clase bloqueada dentro del menú desplegable: mismo look que .top-nav
   a.disabled, pero como <span> (nunca lleva href, la agrega menu-control.js
   solo para las clases que el panel de control marca como activas). */
.nav-dropdown-menu span.nav-locked{
  display:block;
  padding:11px 18px;
  border-bottom:1px solid rgba(255,255,255,.08);
  color:#5c7186;
  cursor:not-allowed;
}
.nav-dropdown-menu span.nav-locked:last-child{border-bottom:none;}

/* ---------- APP LAYOUT (páginas de clase) ---------- */
.app{
  display:flex;
  align-items:flex-start;
  max-width:1180px;
  margin:0 auto;
}

/* ---------- SIDEBAR (menú vertical de lecciones, dentro de cada clase) ---------- */
.sidebar{
  flex:0 0 300px;
  padding:22px 16px 60px;
  position:sticky;
  top:0;
  max-height:100vh;
  overflow-y:auto;
}
.sidebar-class-title{
  display:inline-block;
  font-size:.8rem;
  font-weight:800;
  letter-spacing:.03em;
  color:#fff;
  background:var(--accent);
  padding:4px 14px;
  border-radius:999px;
  margin:4px 8px 10px;
}
.sidebar-phase-title{
  font-size:.83rem;
  font-weight:600;
  line-height:1.4;
  color:var(--brand);
  margin:0 8px 14px;
}
.group-label{
  font-size:.72rem;
  text-transform:uppercase;
  letter-spacing:.09em;
  color:var(--ink-soft);
  font-weight:700;
  margin:22px 8px 8px;
}
.group-label:first-child{margin-top:4px;}
.sidebar-class-title + .group-label{margin-top:4px;}
.sidebar-phase-title + .group-label{margin-top:4px;}
ol.lesson-list{list-style:none; margin:0; padding:0;}
.lesson-group-header{
  list-style:none;
  font-size:.7rem;
  text-transform:uppercase;
  letter-spacing:.08em;
  font-weight:700;
  color:var(--brand);
  background:#e7edf6;
  border:1px solid #c7d5ea;
  border-radius:8px;
  padding:8px 12px;
  margin:16px 0 6px;
}
.lesson-group-header:first-child{margin-top:2px;}
.lesson-item{
  display:flex;
  align-items:center;
  gap:10px;
  padding:10px 12px;
  border-radius:10px;
  margin-bottom:4px;
  cursor:pointer;
  font-size:.9rem;
  color:var(--ink);
  border:1px solid transparent;
  transition:background .18s ease, border-color .18s ease, transform .18s ease;
}
.lesson-item:not(.locked):hover{transform:translateX(2px);}
.lesson-item .idx{
  position:relative;
  flex:0 0 auto;
  width:22px; height:22px;
  border-radius:50%;
  background:#e5e9f1;
  color:var(--ink-soft);
  font-size:.72rem;
  font-weight:700;
  display:flex; align-items:center; justify-content:center;
  transition:background .25s ease, transform .25s ease;
}
.lesson-item.done .idx{animation:checkPop .35s ease;}
.lesson-item .txt{flex:1;}
.lesson-item .time{font-size:.72rem; color:var(--ink-soft);}
.lesson-item:hover{background:#eef1f6;}
.lesson-item.current{
  background:#e7edf6;
  border-color:#c7d5ea;
}
.lesson-item.current .idx{background:var(--brand); color:#fff;}
.lesson-item.done .idx{background:var(--good-soft); color:#215c39;}
.lesson-item.done .idx::after{
  content:"✓";
  position:absolute;
  top:-5px;
  right:-5px;
  width:13px;
  height:13px;
  border-radius:50%;
  background:var(--good);
  color:#fff;
  font-size:8px;
  font-weight:700;
  line-height:1;
  display:flex;
  align-items:center;
  justify-content:center;
  box-shadow:0 0 0 2px var(--paper);
}
.lesson-item.locked{
  cursor:not-allowed;
  color:var(--lock);
}
.lesson-item.locked .idx{background:#eceff3; color:var(--lock);}
.lesson-item.locked .txt{color:var(--lock);}
.lock-glyph{font-size:.8rem; color:var(--lock);}

/* ---------- CONTENT ---------- */
.content{
  flex:1;
  min-width:0;
  padding:28px 28px 90px;
}
.panel-wrap{max-width:700px;}
.lesson-panel{display:none;}
.lesson-panel.active{display:block;}

.kicker{
  font-size:.74rem;
  text-transform:uppercase;
  letter-spacing:.1em;
  color:var(--brand-2);
  font-weight:700;
  margin-bottom:6px;
}
.lesson-panel h2{
  font-size:1.5rem;
  margin:0 0 4px;
  color:var(--brand);
}
.time-chip{
  display:inline-block;
  background:#eef2fb;
  border:1px solid #d3ddf2;
  color:var(--brand);
  font-size:.78rem;
  padding:4px 12px;
  border-radius:999px;
  margin:8px 0 20px;
}
.lede{color:var(--ink-soft); margin:0 0 20px; font-size:.97rem;}

.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:22px 24px;
  margin-bottom:18px;
}

.welcome p{margin:0 0 14px; font-size:1rem;}
.welcome p:last-child{margin-bottom:0;}
.sign{color:var(--ink-soft); font-size:.9rem; margin-top:16px; font-style:italic;}

.stat-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(180px, 1fr));
  gap:12px;
  margin:6px 0 18px;
}
.stat{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:16px 16px;
}
.stat .num{font-size:1.4rem; font-weight:700; color:var(--brand-2); line-height:1.15;}
.stat .label{margin-top:6px; font-size:.82rem; color:var(--ink-soft);}
.stat.highlight{background:var(--accent-soft); border-color:#f0d3ba;}
.stat.highlight .num{color:var(--accent);}
.stat.good-tone{background:var(--good-soft); border-color:#bfe4cc;}
.stat.good-tone .num{color:var(--good);}
.stat.bad-tone{background:var(--bad-soft); border-color:#f0c2be;}
.stat.bad-tone .num{color:var(--bad);}

.sources{font-size:.85rem; color:var(--ink-soft); margin:4px 0 20px;}
.sources a{margin-right:16px; display:inline-block;}

.callout{
  background:var(--accent-soft);
  border:1px solid #f0d3ba;
  border-left:5px solid var(--accent);
  border-radius:10px;
  padding:18px 20px;
  margin-top:6px;
}
.callout .tag{
  text-transform:uppercase; letter-spacing:.08em; font-size:.7rem;
  color:var(--accent); font-weight:700; margin-bottom:6px;
}
.callout p{margin:0; font-size:1rem;}

/* ---------- BLOQUE DE HERRAMIENTA/RECURSO SUGERIDO (p.ej. Diario de Formación) ---------- */
.tool-box{
  background:var(--tool-soft);
  border:1px solid #c7dde6;
  border-left:5px solid var(--tool);
  border-radius:10px;
  padding:18px 20px;
  margin-top:14px;
}
.tool-box .tag{
  text-transform:uppercase; letter-spacing:.08em; font-size:.7rem;
  color:var(--tool); font-weight:700; margin-bottom:8px; display:flex; align-items:center; gap:8px;
}
.tool-box p{margin:0 0 10px; font-size:.94rem;}
.tool-box p:last-child{margin-bottom:0;}
.tool-box ul{margin:8px 0 0 18px; padding:0; font-size:.9rem;}
.tool-box li{margin-bottom:6px;}
.tool-box a.btn-link{
  display:inline-block; margin-top:10px; background:var(--tool); color:#fff;
  text-decoration:none; font-size:.86rem; font-weight:600; padding:8px 16px; border-radius:8px;
}

.quiz-note{
  display:inline-block; background:#eef2fb; border:1px solid #d3ddf2; color:var(--brand);
  font-size:.8rem; padding:5px 12px; border-radius:999px; margin-bottom:14px;
}
.q-block{border-top:1px solid var(--line); padding:18px 0;}
.q-block:first-of-type{border-top:none; padding-top:2px;}
.q-text{font-weight:600; margin-bottom:10px; font-size:.95rem;}
.opts{display:flex; flex-direction:column; gap:8px;}
.opt{
  display:flex; align-items:flex-start; gap:10px; padding:10px 13px;
  border:1px solid var(--line); border-radius:10px; cursor:pointer; font-size:.92rem;
}
.opt:hover{border-color:var(--brand-2);}
.opt input{margin-top:3px;}
.opt.correct{background:var(--good-soft); border-color:#bfe4cc;}
.opt.incorrect{background:var(--bad-soft); border-color:#f0c2be;}
.fb{margin-top:9px; font-size:.85rem; color:var(--ink-soft); display:none; padding:9px 11px; border-radius:8px; background:#f2f4f8;}
.fb.show{display:block;}
.quiz-actions{margin-top:20px; display:flex; align-items:center; gap:14px; flex-wrap:wrap;}
.quiz-result{margin-top:16px; padding:16px 18px; border-radius:10px; display:none; font-size:.94rem;}
.quiz-result.pass{background:var(--good-soft); border:1px solid #bfe4cc; color:#215c39;}
.quiz-result.fail{background:var(--bad-soft); border:1px solid #f0c2be; color:#7d2822;}
.quiz-result .score{font-weight:700; font-size:1.05rem; display:block; margin-bottom:4px;}

.hangman-game{display:flex; flex-direction:column; align-items:center; gap:16px; text-align:center;}
.hg-status-row{display:flex; gap:10px; flex-wrap:wrap; justify-content:center;}
.hg-progress-text{
  display:inline-block; background:#eef2fb; border:1px solid #d3ddf2; color:var(--brand);
  font-size:.8rem; padding:5px 12px; border-radius:999px;
}
.hg-score-text{
  display:inline-block; background:var(--tool-soft); border:1px solid #c7dde6; color:var(--tool);
  font-size:.8rem; font-weight:700; padding:5px 12px; border-radius:999px;
}
.hg-figure{width:140px; height:150px;}
.hg-figure svg{width:100%; height:100%;}
.hg-gallows{stroke:var(--ink-soft); stroke-width:3; fill:none; stroke-linecap:round;}
.hg-part{opacity:0; transition:opacity .25s ease;}
.hg-part.show{opacity:1;}
.hg-part-head{fill:none; stroke:var(--bad); stroke-width:3;}
.hg-part-limb{stroke:var(--bad); stroke-width:3; stroke-linecap:round;}
.hg-hint{max-width:520px; font-size:.92rem; color:var(--ink-soft); margin:0;}
.hg-word{display:flex; flex-wrap:wrap; justify-content:center; gap:6px;}
.hg-letter-box{
  display:inline-flex; align-items:center; justify-content:center;
  width:30px; height:38px; border-bottom:3px solid var(--brand);
  font-size:1.15rem; font-weight:700; font-family:ui-monospace, "SFMono-Regular", Consolas, monospace;
  color:var(--brand); text-transform:uppercase;
}
.hg-keyboard{display:flex; flex-direction:column; gap:8px; align-items:center;}
.hg-key-row{display:flex; gap:6px; flex-wrap:wrap; justify-content:center;}
.hg-key{
  width:34px; height:36px; border-radius:8px; border:1px solid var(--line); background:var(--card);
  color:var(--ink); font-weight:700; font-size:.86rem; cursor:pointer; padding:0;
  transition:background .15s ease, border-color .15s ease, transform .1s ease;
}
.hg-key:hover:not(:disabled){border-color:var(--brand-2); transform:translateY(-1px);}
.hg-key:disabled{cursor:default;}
.hg-key.correct{background:var(--good-soft); border-color:#bfe4cc; color:var(--good);}
.hg-key.wrong{background:var(--bad-soft); border-color:#f0c2be; color:var(--bad); opacity:.6;}
.hg-message{min-height:1.4em; font-size:.92rem; font-weight:600;}
.hg-message.success{color:var(--good);}
.hg-message.fail{color:var(--bad);}
.hg-actions{display:flex; gap:12px; flex-wrap:wrap; justify-content:center;}

.checklist{list-style:none; margin:0; padding:0;}
.checklist li{display:flex; gap:12px; padding:12px 0; border-top:1px solid var(--line); font-size:.94rem;}
.checklist li:first-child{border-top:none;}
.checklist .num-badge{
  flex:0 0 auto; width:24px; height:24px; border-radius:50%; background:var(--brand);
  color:#fff; font-size:.74rem; font-weight:700; display:flex; align-items:center; justify-content:center;
}

.task-box{
  background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:20px 22px; margin-bottom:14px;
}
.task-box h3{margin:18px 0 10px; font-size:1.02rem; color:var(--brand);}
.task-box h3:first-child{margin-top:0;}
.task-box ol, .task-box ul{margin:0 0 0 18px; padding:0; font-size:.94rem;}
.task-box li{margin-bottom:8px;}
.restriction{
  background:var(--bad-soft); border:1px solid #f0c2be; border-left:4px solid var(--bad);
  border-radius:8px; padding:12px 14px; margin-top:14px; font-size:.9rem; color:#7d2822;
}
.restriction strong{display:block; font-size:.72rem; text-transform:uppercase; letter-spacing:.06em; margin-bottom:4px;}

.case-note{
  background:#eef2fb; border:1px solid #d3ddf2; border-left:4px solid var(--brand);
  border-radius:8px; padding:12px 14px; margin-top:14px; font-size:.88rem; color:var(--ink-soft);
}
.case-note strong{color:var(--brand);}
.case-note a{font-weight:600;}

.format-example{
  background:#f2f4f8; border:1px solid var(--line); border-radius:10px;
  padding:14px 16px; font-family:'Consolas','Menlo',monospace; font-size:.84rem;
  margin:12px 0; white-space:pre-wrap; color:var(--ink);
}
.format-example .bad{color:var(--bad);}
.format-example .good{color:var(--good);}

.borrowed-tag{
  display:inline-block; background:var(--accent-soft); border:1px solid #f0d3ba; color:var(--accent);
  font-size:.72rem; font-weight:700; text-transform:uppercase; letter-spacing:.06em;
  padding:4px 10px; border-radius:999px; margin-bottom:10px;
}

.industry-note{
  background:var(--tool-soft); border:1px solid #c7dde6; border-left:4px solid var(--tool);
  border-radius:8px; padding:14px 16px; margin-top:14px; font-size:.88rem; color:var(--ink);
}
.industry-note strong{color:var(--tool);}
.industry-note p{margin:6px 0 0;}
.industry-note p:first-of-type{margin-top:0;}

button{font-family:inherit; font-size:.92rem; font-weight:600; padding:11px 20px; border-radius:10px; border:none; cursor:pointer;}
.btn-primary{background:var(--brand); color:#fff;}
.btn-primary:hover{background:#16283f;}
.btn-secondary{background:#fff; color:var(--brand); border:1px solid var(--brand);}
.btn-primary:disabled{background:#c6cdda; cursor:not-allowed;}
a.btn-primary{
  display:inline-block; text-decoration:none; text-align:center;
  font-family:inherit; font-size:.92rem; font-weight:600;
  padding:11px 20px; border-radius:10px;
}

.nav-buttons{
  display:flex; justify-content:space-between; align-items:center;
  margin-top:26px; padding-top:20px; border-top:1px solid var(--line); max-width:700px;
}
.end-note{font-size:.88rem; color:var(--ink-soft); font-style:italic;}

footer.site-footer{background:#16283f; color:#b9c8d8; padding:22px 24px; font-size:.8rem;}

/* ---------- MOVIMIENTO: entrada escalonada de cada lección ---------- */
@keyframes fadeSlideIn{
  from{opacity:0; transform:translateY(12px);}
  to{opacity:1; transform:translateY(0);}
}
@keyframes popIn{
  from{opacity:0; transform:scale(.9);}
  to{opacity:1; transform:scale(1);}
}
@keyframes checkPop{
  0%{transform:scale(.6);}
  55%{transform:scale(1.15);}
  100%{transform:scale(1);}
}
@keyframes shakeX{
  10%,90%{transform:translateX(-1px);}
  20%,80%{transform:translateX(2px);}
  30%,50%,70%{transform:translateX(-3px);}
  40%,60%{transform:translateX(3px);}
}
@keyframes drawLine{
  to{stroke-dashoffset:0;}
}

.lesson-panel.active > *{
  animation:fadeSlideIn .45s ease both;
}
.lesson-panel.active > *:nth-child(1){animation-delay:.02s}
.lesson-panel.active > *:nth-child(2){animation-delay:.08s}
.lesson-panel.active > *:nth-child(3){animation-delay:.14s}
.lesson-panel.active > *:nth-child(4){animation-delay:.20s}
.lesson-panel.active > *:nth-child(5){animation-delay:.26s}
.lesson-panel.active > *:nth-child(6){animation-delay:.32s}
.lesson-panel.active > *:nth-child(7){animation-delay:.38s}
.lesson-panel.active > *:nth-child(8){animation-delay:.44s}
.lesson-panel.active > *:nth-child(n+9){animation-delay:.50s}

.stat-grid .stat{animation:popIn .4s ease both;}
.stat-grid .stat:nth-child(1){animation-delay:.16s}
.stat-grid .stat:nth-child(2){animation-delay:.24s}
.stat-grid .stat:nth-child(3){animation-delay:.32s}
.stat-grid .stat:nth-child(4){animation-delay:.40s}

.opt{transition:background .2s ease, border-color .2s ease, transform .15s ease;}
.opt.correct{animation:popIn .3s ease;}
.opt.incorrect{animation:shakeX .4s ease;}

button, a.btn-primary{transition:transform .15s ease, background .15s ease;}
button:hover:not(:disabled), a.btn-primary:hover{transform:translateY(-2px);}
.lesson-panel.active{animation:fadeSlideIn .3s ease both;}

/* ---------- FIGURAS / DIAGRAMAS EXPLICATIVOS ---------- */
.diagram-figure{
  margin:14px 0 22px;
  padding:18px 16px 12px;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
}
.diagram-figure svg{
  display:block;
  width:100%;
  height:auto;
  color:var(--ink);
}
.diagram-figure figcaption{
  font-size:.82rem;
  color:var(--ink-soft);
  margin-top:10px;
  text-align:center;
}
.diagram-figure .flow-line{
  stroke-dasharray:600;
  stroke-dashoffset:600;
  animation:drawLine .9s ease forwards;
}
.diagram-figure .flow-node{
  opacity:0;
  animation:popIn .4s ease forwards;
}
.diagram-figure .flow-label{
  opacity:0;
  animation:fadeSlideIn .4s ease forwards;
}

/* ---------- TÉRMINOS CON EXPLICACIÓN EMERGENTE ---------- */
.tip{
  border-bottom:1px dotted var(--brand-2);
  cursor:help;
  position:relative;
  font-weight:600;
  color:var(--brand-2);
}
.tip::after{
  content:attr(data-tip);
  position:absolute;
  left:50%;
  bottom:calc(100% + 9px);
  transform:translateX(-50%) translateY(4px);
  background:var(--brand);
  color:#fff;
  font-size:.78rem;
  font-weight:500;
  padding:9px 12px;
  border-radius:9px;
  width:max-content;
  max-width:230px;
  line-height:1.4;
  opacity:0;
  pointer-events:none;
  transition:opacity .16s ease, transform .16s ease;
  z-index:30;
  box-shadow:0 8px 20px rgba(15,25,40,.22);
}
.tip::before{
  content:"";
  position:absolute;
  left:50%;
  bottom:100%;
  transform:translateX(-50%);
  border:6px solid transparent;
  border-top-color:var(--brand);
  margin-bottom:-3px;
  opacity:0;
  transition:opacity .16s ease;
  pointer-events:none;
}
.tip:hover::after, .tip:focus::after,
.tip:hover::before, .tip:focus::before{
  opacity:1;
  transform:translateX(-50%) translateY(0);
}

/* ---------- ACCESIBILIDAD: respeta "reducir movimiento" ---------- */
@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
}

@media (max-width:900px){
  .app{flex-direction:column;}
  .sidebar{
    position:static; width:100%; max-height:none; overflow:visible;
    display:flex; flex-wrap:nowrap; align-items:center; overflow-x:auto; gap:6px; padding:14px 16px;
    border-bottom:1px solid var(--line);
  }
  .sidebar-class-title, .sidebar-phase-title{display:none;}
  .group-label{display:none;}
  .lesson-group-header{display:none;}
  ol.lesson-list{display:flex; gap:6px;}
  .lesson-item{white-space:nowrap; flex:0 0 auto;}
  .content{padding:20px 18px 70px;}
}

/* ---------- INDEX / LANDING PAGE ---------- */
.index-wrap{max-width:900px; margin:0 auto; padding:40px 24px 80px;}
.index-wrap h2{color:var(--brand); font-size:1.3rem; margin:0 0 6px;}
.index-wrap h2:not(:first-child){margin-top:36px;}
.index-wrap .lede{margin-bottom:26px;}
.index-wrap .card.welcome{margin-bottom:0;}
.index-wrap .tool-box{margin-top:0;}

.phase-grid{
  display:grid;
  grid-template-columns:repeat(2, 1fr);
  gap:16px;
}
@media (max-width:640px){
  .phase-grid{grid-template-columns:1fr;}
}
.phase-card{
  background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:22px 24px;
}
.phase-card .eyebrow-card{
  text-transform:uppercase; letter-spacing:.09em; font-size:.7rem; color:var(--brand-2); font-weight:700;
  margin-bottom:8px; display:flex; align-items:center; gap:8px; flex-wrap:wrap;
}
.phase-card h3{margin:0 0 8px; font-size:1.02rem; color:var(--brand); line-height:1.35;}
.phase-card p{margin:0; font-size:.88rem; color:var(--ink-soft);}
.phase-status{
  display:inline-block; font-size:.66rem; font-weight:700; letter-spacing:.02em;
  padding:3px 10px; border-radius:999px; text-transform:none;
}
.phase-status.available{background:var(--good-soft); color:var(--good);}
.phase-status.soon{background:#eceff3; color:var(--lock);}

.code-table-wrap{
  background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:22px 24px; overflow-x:auto;
}
.code-table-wrap > p.lede{margin:0 0 18px; font-size:.88rem; color:var(--ink-soft);}
.code-table{
  width:100%; border-collapse:separate; border-spacing:0; font-size:.84rem; min-width:680px;
  border:1px solid var(--line); border-radius:10px; overflow:hidden;
}
.code-table thead th{
  text-align:left; padding:11px 14px; background:var(--brand); color:#fff;
  font-size:.68rem; text-transform:uppercase; letter-spacing:.07em; font-weight:700;
  border-right:1px solid rgba(255,255,255,.14);
}
.code-table thead th:last-child{border-right:none;}
.code-table td{
  padding:11px 14px; border-bottom:1px solid var(--line); border-right:1px solid var(--line);
  vertical-align:top; color:var(--ink);
}
.code-table td:last-child{border-right:none;}
.code-table tbody tr:last-child td{border-bottom:none;}
.code-table tbody tr:nth-child(even){background:#f6f8fa;}
.code-table tbody tr:hover{background:var(--tool-soft);}
.code-table td:first-child{white-space:nowrap;}
.code-table .code-chip{
  display:inline-block; font-family:ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-weight:700; font-size:.8rem; color:var(--brand); background:var(--accent-soft);
  border:1px solid #f0d3ba; border-radius:6px; padding:3px 8px;
}
.code-table td:nth-child(2){color:var(--ink-soft); font-size:.8rem;}
.code-table td:last-child{color:var(--ink-soft);}
.code-table td:last-child strong{color:var(--tool);}
.code-table .infer-note{display:block; font-size:.72rem; font-style:italic; color:var(--ink-soft); margin-top:4px;}

.class-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(240px, 1fr));
  gap:16px;
}
.class-card{
  background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:22px 24px; text-decoration:none; color:var(--ink); display:block;
  transition:border-color .18s ease;
}
.class-card:hover{border-color:var(--brand-2);}
.class-card .eyebrow-card{
  text-transform:uppercase; letter-spacing:.09em; font-size:.7rem; color:var(--brand-2); font-weight:700; margin-bottom:8px;
}
.class-card h3{margin:0 0 8px; font-size:1.1rem; color:var(--brand);}
.class-card p{margin:0; font-size:.9rem; color:var(--ink-soft);}
.class-card .class-card-meta{display:block; margin-top:12px; font-size:.78rem; color:var(--brand-2); font-weight:700;}
.class-card .class-card-meta.today{color:var(--accent);}

@media (max-width:600px){
  .brand-logo{height:34px; padding:5px 9px;}
}