/* ==========================================================================
   VALSET ENGLISH — Design tokens
   Concepto: "pasaporte de aprendizaje" — sellos, expedientes, cartografía
   de una ruta de niveles MCER para bachillerato técnico.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,600;9..144,700;9..144,900&family=Work+Sans:ital,wght@0,400;0,500;0,600;0,700;1,500&family=IBM+Plex+Mono:wght@500;600&display=swap');

:root{
  /* Color */
  --red:        #B8202B;   /* rojo del escudo */
  --red-deep:   #7E151D;
  --ink:        #1C1A17;   /* negro cálido, cerca del tipo del logo */
  --parchment:  #F6F0E4;   /* pergamino / fondo cálido */
  --parchment-2:#EFE6D3;
  --navy:       #1F2B3D;   /* azul técnico, contraste académico */
  --gold:       #C08A34;   /* sello / logro */
  --line:       #DACFB6;   /* hairline sobre pergamino */
  --paper:      #FCFAF4;
  --ok:         #3E7A4C;
  --bad:        #A3323A;

  /* Type */
  --f-display: "Fraunces", Georgia, serif;
  --f-body: "Work Sans", "Segoe UI", sans-serif;
  --f-mono: "IBM Plex Mono", "Courier New", monospace;

  --radius: 4px;
  --shadow-stamp: 0 6px 18px rgba(28,26,23,.18);
  --container: 1180px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{ animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; scroll-behavior:auto !important; }
}

body{
  margin:0;
  font-family:var(--f-body);
  color:var(--ink);
  background:var(--parchment);
  background-image:
    radial-gradient(circle at 1px 1px, rgba(28,26,23,.05) 1px, transparent 0);
  background-size: 22px 22px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}

img{ max-width:100%; display:block; }
a{ color:inherit; }
button{ font-family:inherit; }

.container{ max-width:var(--container); margin-inline:auto; padding-inline:24px; }

h1,h2,h3,h4{ font-family:var(--f-display); font-weight:700; margin:0 0 .4em; line-height:1.08; letter-spacing:-.01em; }
h1{ font-size:clamp(2.1rem, 4.4vw, 3.6rem); font-weight:900; }
h2{ font-size:clamp(1.5rem, 2.6vw, 2.15rem); }
h3{ font-size:1.25rem; }
p{ margin:0 0 1em; }
.lede{ font-size:1.1rem; color:#4a4640; max-width:60ch; }

.eyebrow{
  font-family:var(--f-mono); font-size:.72rem; letter-spacing:.14em; text-transform:uppercase;
  color:var(--red-deep); font-weight:600; display:inline-flex; align-items:center; gap:.5em;
}
.eyebrow::before{ content:""; width:18px; height:2px; background:var(--red); display:inline-block; }

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

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky; top:0; z-index:50;
  background:rgba(246,240,228,.92); backdrop-filter:blur(6px);
  border-bottom:1px solid var(--line);
}
.nav{ display:flex; align-items:center; justify-content:space-between; padding-block:12px; gap:16px; }
.brand{ display:flex; align-items:center; gap:12px; text-decoration:none; }
.brand img{ height:44px; width:44px; border-radius:50%; box-shadow:var(--shadow-stamp); }
.brand-text{ font-family:var(--f-display); font-weight:900; font-size:1.15rem; letter-spacing:.02em; }
.brand-text small{ display:block; font-family:var(--f-mono); font-weight:500; font-size:.62rem; letter-spacing:.12em; text-transform:uppercase; color:var(--red-deep); }

.nav-links{ display:flex; align-items:center; gap:6px; list-style:none; margin:0; padding:0; }
.nav-links a{
  text-decoration:none; font-weight:600; font-size:.92rem; padding:8px 12px; border-radius:999px;
  color:var(--ink); transition:background .15s, color .15s;
}
.nav-links a:hover,.nav-links a.active{ background:var(--ink); color:var(--paper); }
.nav-toggle{ display:none; background:none; border:2px solid var(--ink); border-radius:6px; padding:8px 10px; cursor:pointer; }
.nav-toggle span{ display:block; width:20px; height:2px; background:var(--ink); margin:4px 0; }

@media (max-width:760px){
  .nav-toggle{ display:block; }
  .nav-links{
    position:absolute; top:100%; left:0; right:0; flex-direction:column; align-items:stretch;
    background:var(--paper); border-bottom:1px solid var(--line); padding:10px 16px 16px;
    display:none;
  }
  .nav-links.open{ display:flex; }
  .nav-links a{ padding:12px; }
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:.5em; font-weight:700; font-size:.95rem;
  padding:12px 22px; border-radius:999px; border:2px solid var(--ink); background:transparent;
  color:var(--ink); text-decoration:none; cursor:pointer; transition:transform .15s, background .15s, color .15s;
}
.btn:hover{ transform:translateY(-2px); }
.btn-primary{ background:var(--red); border-color:var(--red); color:var(--paper); }
.btn-primary:hover{ background:var(--red-deep); border-color:var(--red-deep); }
.btn-ghost{ border-color:var(--line); }
.btn-sm{ padding:8px 16px; font-size:.82rem; }

/* ---------- Hero (home) ---------- */
.hero{ padding:64px 0 40px; position:relative; overflow:clip; }
.hero-grid{ display:grid; grid-template-columns:1.1fr .9fr; gap:48px; align-items:center; }
@media (max-width:860px){ .hero-grid{ grid-template-columns:1fr; } }

.hero-seal{
  position:relative; width:min(340px,80vw); aspect-ratio:1; margin-inline:auto;
}
.hero-seal img{ width:100%; height:100%; border-radius:50%; box-shadow:var(--shadow-stamp); border:6px solid var(--paper); outline:2px solid var(--line); }
.hero-seal .ring-text{ position:absolute; inset:-26px; animation:spin 26s linear infinite; }
@keyframes spin{ to{ transform:rotate(360deg); } }

.hero-cta{ display:flex; gap:14px; flex-wrap:wrap; margin-top:26px; }

/* ---------- Stamped panel (video / info) ---------- */
.panel{
  background:var(--paper); border:1px solid var(--line); border-radius:var(--radius);
  box-shadow:var(--shadow-stamp);
}
.section{ padding:64px 0; }
.section-alt{ background:var(--parchment-2); border-block:1px solid var(--line); }
.section-navy{ background:var(--navy); color:var(--paper); }
.section-navy .eyebrow{ color:#E8A33D; }
.section-navy .eyebrow::before{ background:#E8A33D; }

.video-frame{
  position:relative; padding:14px; background:var(--paper); border:1px solid var(--line);
  border-radius:6px; box-shadow:var(--shadow-stamp); transform:rotate(-.6deg);
}
.video-frame video{ width:100%; border-radius:3px; display:block; background:#000; }
.video-frame .tape{
  position:absolute; top:-14px; left:32px; width:78px; height:26px;
  background:rgba(192,138,52,.55); border:1px solid rgba(192,138,52,.7);
  transform:rotate(-4deg);
}
.video-frame .tape.r{ left:auto; right:32px; transform:rotate(5deg); }
.teacher-caption{ font-family:var(--f-mono); font-size:.78rem; color:#6b655a; margin-top:14px; text-align:center; }

/* ---------- Path / roadmap (home) ---------- */
.path{ position:relative; padding-top:24px; }
.path-track{ position:relative; display:grid; grid-template-columns:repeat(3,1fr); gap:28px; }
.path-track::before{
  content:""; position:absolute; top:52px; left:8%; right:8%; height:2px;
  background:repeating-linear-gradient(90deg, var(--line) 0 10px, transparent 10px 18px);
  z-index:0;
}
@media (max-width:760px){ .path-track{ grid-template-columns:1fr; } .path-track::before{ display:none; } }

.station{ position:relative; z-index:1; text-decoration:none; color:inherit; display:flex; flex-direction:column; align-items:center; text-align:center; }
.stamp{
  width:104px; height:104px; border-radius:50%; display:flex; align-items:center; justify-content:center;
  flex-direction:column; border:3px solid currentColor; position:relative; background:var(--paper);
  box-shadow:var(--shadow-stamp); transition:transform .2s;
}
.station:hover .stamp{ transform:rotate(-4deg) scale(1.04); }
.stamp .code{ font-family:var(--f-mono); font-weight:700; font-size:1.4rem; }
.stamp .mark{ font-size:.6rem; font-family:var(--f-mono); letter-spacing:.08em; text-transform:uppercase; }
.stamp::after{ content:""; position:absolute; inset:6px; border:1px dashed currentColor; border-radius:50%; opacity:.5; }
.station-title{ font-weight:700; margin-top:14px; }
.station-desc{ font-size:.85rem; color:#5c574c; max-width:22ch; }
.station[data-progress="done"] .stamp::before{
  content:"✓"; position:absolute; top:-6px; right:-6px; width:28px; height:28px; border-radius:50%;
  background:var(--ok); color:#fff; display:flex; align-items:center; justify-content:center; font-size:.85rem; border:2px solid var(--paper);
}

/* level colors */
.lvl-a1{ color:var(--gold); }
.lvl-a2{ color:var(--navy); }
.lvl-b1{ color:var(--red); }

/* ---------- Level page header ---------- */
.level-hero{ padding:52px 0 36px; display:flex; gap:34px; align-items:center; flex-wrap:wrap; }
.level-hero .stamp{ width:130px; height:130px; flex-shrink:0; }
.level-hero .stamp .code{ font-size:1.9rem; }
.level-meta{ display:flex; gap:10px; flex-wrap:wrap; margin-top:14px; }
.tag{ font-family:var(--f-mono); font-size:.72rem; text-transform:uppercase; letter-spacing:.07em; padding:5px 10px; border:1px solid var(--line); border-radius:999px; background:var(--paper); }

.level-progress{ margin-top:18px; max-width:420px; }
.bar{ height:8px; border-radius:999px; background:var(--parchment-2); border:1px solid var(--line); overflow:hidden; }
.bar > span{ display:block; height:100%; background:var(--red); width:0%; transition:width .4s; }
.progress-label{ font-family:var(--f-mono); font-size:.72rem; margin-top:6px; color:#6b655a; }

/* ---------- Topic module ---------- */
.topic{ padding:52px 0; border-top:1px solid var(--line); }
.topic-head{ display:grid; grid-template-columns:auto 1fr; gap:22px; align-items:flex-start; margin-bottom:8px; }
.topic-icon{ width:64px; height:64px; flex-shrink:0; }
.topic-num{ font-family:var(--f-mono); font-size:.78rem; color:var(--red-deep); font-weight:600; letter-spacing:.06em; }
.topic-done-btn{ margin-left:auto; }
.topic-head-row{ display:flex; align-items:flex-start; gap:16px; flex-wrap:wrap; }

.topic-columns{ display:grid; grid-template-columns:1.05fr .95fr; gap:36px; margin-top:28px; align-items:start; }
@media (max-width:900px){ .topic-columns{ grid-template-columns:1fr; } }

/* ---------- Visual organizer (mind map) ---------- */
.organizer{ background:var(--paper); border:1px solid var(--line); border-radius:8px; padding:14px; box-shadow:var(--shadow-stamp); }
.organizer svg{ width:100%; height:auto; display:block; }
.organizer-title{ font-family:var(--f-mono); font-size:.7rem; text-transform:uppercase; letter-spacing:.1em; color:#6b655a; padding:0 4px 8px; }

/* ---------- Flashcards (vocab) ---------- */
.flash-toolbar{ display:flex; justify-content:space-between; align-items:center; margin-bottom:12px; gap:10px; flex-wrap:wrap; }
.flash-grid{ display:grid; grid-template-columns:repeat(auto-fill, minmax(150px,1fr)); gap:14px; }
.flashcard{ perspective:1000px; height:132px; }
.flashcard-inner{
  position:relative; width:100%; height:100%; transform-style:preserve-3d; transition:transform .5s;
  cursor:pointer; border-radius:8px;
}
.flashcard.flipped .flashcard-inner{ transform:rotateY(180deg); }
.flashcard-face{
  position:absolute; inset:0; backface-visibility:hidden; border-radius:8px; border:1px solid var(--line);
  display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center;
  padding:10px; background:var(--paper); box-shadow:0 2px 6px rgba(28,26,23,.08);
}
.flashcard-face.back{ transform:rotateY(180deg); background:var(--ink); color:var(--paper); border-color:var(--ink); }
.flashcard-face .word{ font-family:var(--f-display); font-weight:700; font-size:1.05rem; }
.flashcard-face .pos{ font-family:var(--f-mono); font-size:.62rem; color:var(--red-deep); text-transform:uppercase; letter-spacing:.08em; margin-top:4px; }
.flashcard-face.back .pos{ color:#E8A33D; }
.flashcard-face .ex{ font-size:.72rem; margin-top:6px; color:#d8d3c8; }
.speak-btn{
  position:absolute; bottom:6px; right:6px; width:26px; height:26px; border-radius:50%; border:1px solid var(--line);
  background:var(--paper); display:flex; align-items:center; justify-content:center; cursor:pointer; font-size:.8rem;
}
.flashcard-face.back .speak-btn{ background:transparent; border-color:#4c5566; color:var(--paper); }

/* ---------- Exercises ---------- */
.level-switch{ display:flex; gap:8px; flex-wrap:wrap; margin-bottom:8px; }
.pill{
  font-family:var(--f-mono); font-size:.8rem; font-weight:600; padding:9px 18px; border-radius:999px;
  border:2px solid var(--ink); background:transparent; cursor:pointer; text-decoration:none; color:var(--ink);
}
.pill.active{ background:var(--ink); color:var(--paper); }

.score-board{ display:flex; gap:22px; align-items:center; font-family:var(--f-mono); font-size:.85rem; margin:18px 0 28px; flex-wrap:wrap; }
.score-board .num{ font-size:1.3rem; font-weight:700; }

.exercise-card{ background:var(--paper); border:1px solid var(--line); border-radius:8px; padding:22px; margin-bottom:18px; box-shadow:0 2px 6px rgba(28,26,23,.06); }
.exercise-kind{ font-family:var(--f-mono); font-size:.68rem; text-transform:uppercase; letter-spacing:.09em; color:var(--red-deep); margin-bottom:8px; display:block; }
.opt-list{ display:grid; gap:8px; margin-top:14px; }
.opt{
  text-align:left; padding:11px 14px; border:1px solid var(--line); border-radius:6px; background:var(--parchment);
  cursor:pointer; font-size:.95rem; transition:border-color .15s, background .15s;
}
.opt:hover{ border-color:var(--ink); }
.opt.correct{ border-color:var(--ok); background:#e7f2e9; }
.opt.incorrect{ border-color:var(--bad); background:#f6e6e7; }
.opt:disabled{ cursor:default; }

.fill-row{ display:flex; gap:10px; align-items:center; flex-wrap:wrap; margin-top:14px; }
.fill-row input{
  font-family:var(--f-mono); font-size:1rem; padding:9px 12px; border:1px solid var(--line); border-radius:6px;
  background:var(--parchment); min-width:160px;
}
.fill-row input.correct{ border-color:var(--ok); background:#e7f2e9; }
.fill-row input.incorrect{ border-color:var(--bad); background:#f6e6e7; }
.feedback{ font-size:.85rem; margin-top:10px; font-weight:600; min-height:1.2em; }
.feedback.ok{ color:var(--ok); }
.feedback.bad{ color:var(--bad); }

.match-grid{ display:grid; grid-template-columns:1fr 1fr; gap:10px 24px; margin-top:14px; }
.match-item{ padding:10px 12px; border:1px solid var(--line); border-radius:6px; background:var(--parchment); cursor:pointer; font-size:.92rem; text-align:left; }
.match-item.selected{ border-color:var(--navy); background:#e7ecf3; }
.match-item.paired{ border-color:var(--ok); background:#e7f2e9; opacity:.75; cursor:default; }
.match-item.wrong{ animation:shake .3s; border-color:var(--bad); }
@keyframes shake{ 25%{ transform:translateX(-4px);} 75%{ transform:translateX(4px);} }

/* ---------- Footer ---------- */
.site-footer{ padding:44px 0 60px; border-top:1px solid var(--line); background:var(--paper); }
.footer-grid{ display:flex; justify-content:space-between; gap:20px; flex-wrap:wrap; align-items:flex-start; }
.footer-brand{ display:flex; gap:12px; align-items:center; }
.footer-brand img{ height:38px; width:38px; border-radius:50%; }
.footer-note{ font-size:.82rem; color:#6b655a; max-width:40ch; }
.footer-links{ display:flex; gap:18px; list-style:none; padding:0; margin:0; font-size:.88rem; font-weight:600; }
.footer-links a{ text-decoration:none; }
.footer-links a:hover{ text-decoration:underline; }

/* ---------- Utility ---------- */
.grid-3{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
@media (max-width:760px){ .grid-3{ grid-template-columns:1fr; } }
.reveal{ opacity:0; transform:translateY(14px); transition:opacity .5s ease, transform .5s ease; }
.reveal.in{ opacity:1; transform:none; }


/* Firebase authentication controls */
#auth-loader{position:fixed;inset:0;z-index:99999;display:grid;place-items:center;background:#f4efe5;color:#171411;font-family:Arial,sans-serif}.auth-loader-card{text-align:center;padding:28px}.auth-spinner{width:42px;height:42px;border:4px solid #d7cdbd;border-top-color:#8c1515;border-radius:50%;margin:0 auto 14px;animation:auth-spin .8s linear infinite}@keyframes auth-spin{to{transform:rotate(360deg)}}.session-controls{display:flex;align-items:center;gap:9px;margin-left:auto;font-family:Arial,sans-serif}.session-email{max-width:180px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.78rem;color:#625c54}.session-logout{border:1px solid #8c1515;background:transparent;color:#8c1515;border-radius:999px;padding:9px 13px;font-weight:700;cursor:pointer}.session-logout:hover{background:#8c1515;color:#fff}.local-preview-notice{position:relative;z-index:9999;padding:12px 18px;background:#fff3cd;color:#654d03;font-family:Arial,sans-serif;text-align:center}.local-preview-notice code{background:rgba(0,0,0,.06);padding:2px 5px;border-radius:4px}@media(max-width:900px){.session-controls{width:100%;justify-content:flex-end;padding:8px 0}.session-email{display:none}}