/* ═══════════════════════════════════════════════════════════════
   ARTECLAB · Curso Flutter GIS — Sistema de Diseño
   Centralizado: un solo CSS para todo el sitio
   ═══════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800;900&family=Fira+Code:wght@400;500;600&display=swap');

/* ── Tokens de diseño ──────────────────────────────── */
:root {
  --bg-void: #050a12;
  --bg-base: #0a1120;
  --bg-raised: #0f1729;
  --bg-surface: #151f32;
  --bg-overlay: #1a2640;

  --border-subtle: rgba(255,255,255,0.06);
  --border-default: rgba(255,255,255,0.09);
  --border-strong: rgba(255,255,255,0.14);

  --teal-400: #2dd4bf;
  --teal-500: #14b8a6;
  --teal-600: #0d9488;
  --teal-glow: rgba(45,212,191,0.12);
  --teal-glow-md: rgba(45,212,191,0.2);
  --teal-glow-lg: rgba(45,212,191,0.35);

  --green-500: #22c55e;
  --amber-500: #f59e0b;
  --red-500: #ef4444;
  --blue-500: #3b82f6;
  --purple-500: #a855f7;

  --text-primary: #f0f4f8;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0a1120;

  --font-body: 'Outfit', system-ui, sans-serif;
  --font-mono: 'Fira Code', 'Consolas', monospace;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ── Reset & base ──────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-body);
  background: var(--bg-void);
  color: var(--text-secondary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 0%, rgba(45,212,191,0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 100%, rgba(59,130,246,0.04) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

a { color: var(--teal-400); text-decoration: none; transition: color 0.2s var(--ease); }
a:hover { color: var(--teal-500); }

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 2px 7px;
  border-radius: 5px;
  color: var(--teal-400);
}

kbd {
  font-family: var(--font-mono);
  font-size: 0.8em;
  background: var(--bg-overlay);
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  padding: 2px 8px;
  border-radius: 5px;
  color: var(--text-primary);
}

/* ── Layout ────────────────────────────────────────── */
.site-wrapper {
  position: relative;
  z-index: 1;
  min-height: 100vh;
}

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Topbar ────────────────────────────────────────── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  background: rgba(10,17,32,0.82);
  border-bottom: 1px solid var(--border-subtle);
}

.topbar-inner {
  max-width: 880px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
  text-decoration: none;
}

.topbar-brand img {
  height: 28px;
  width: auto;
}

.topbar-brand span {
  opacity: 0.4;
  margin: 0 2px;
}

.topbar-brand .brand-course {
  color: var(--teal-400);
  font-weight: 600;
}

.topbar-nav {
  display: flex;
  gap: 6px;
}

.topbar-nav a {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all 0.2s var(--ease);
}

.topbar-nav a:hover {
  background: var(--teal-glow);
  color: var(--teal-400);
}

.topbar-nav a.active {
  background: var(--teal-glow-md);
  color: var(--teal-400);
}

/* ── Module Header ─────────────────────────────────── */
.mod-header {
  padding: 56px 0 40px;
  text-align: center;
  position: relative;
}

.mod-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--teal-500), transparent);
}

.mod-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--teal-glow);
  color: var(--teal-400);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 6px 18px;
  border-radius: 30px;
  border: 1px solid rgba(45,212,191,0.15);
  margin-bottom: 20px;
}

.mod-title {
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1.15;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
}

.mod-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 20px;
  font-weight: 400;
  line-height: 1.7;
}

.mod-stats {
  display: flex;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
}

.mod-stat {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ── Tabs ──────────────────────────────────────────── */
.tabs {
  display: flex;
  gap: 4px;
  padding: 32px 0 0;
  border-bottom: 1px solid var(--border-subtle);
  overflow-x: auto;
  scrollbar-width: none;
}

.tabs::-webkit-scrollbar { display: none; }

.tab-btn {
  background: none;
  border: none;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 12px 22px;
  cursor: pointer;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: all 0.25s var(--ease);
  position: relative;
  top: 1px;
}

.tab-btn:hover {
  color: var(--text-secondary);
}

.tab-btn.active {
  color: var(--teal-400);
  border-bottom-color: var(--teal-400);
}

.tab-panel {
  display: none;
  padding: 36px 0;
  animation: panelIn 0.4s var(--ease);
}

.tab-panel.active { display: block; }

@keyframes panelIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Sections ──────────────────────────────────────── */
.sec {
  margin-bottom: 44px;
}

.sec-heading {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.sec-lead {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 0.95rem;
}

/* ── Cards ─────────────────────────────────────────── */
.card {
  background: var(--bg-raised);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 20px;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.card:hover {
  border-color: var(--border-strong);
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.card p { font-size: 0.93rem; }

/* ── GIS Analogy badge ─────────────────────────────── */
.gis-analogy {
  background: var(--teal-glow);
  border-left: 3px solid var(--teal-500);
  padding: 12px 16px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 14px 0;
  font-size: 0.88rem;
  color: var(--teal-400);
  line-height: 1.6;
}

.gis-analogy::before {
  content: '🗺️ Analogía GIS — ';
  font-weight: 700;
}

/* ── Code blocks ───────────────────────────────────── */
.codeblock {
  background: #0b0f19;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 14px 0;
}

.codeblock-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: rgba(255,255,255,0.025);
  border-bottom: 1px solid var(--border-subtle);
}

.codeblock-lang {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--teal-500);
  text-transform: uppercase;
  letter-spacing: 1.2px;
}

.codeblock-copy {
  background: transparent;
  border: 1px solid var(--border-default);
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s var(--ease);
}

.codeblock-copy:hover { border-color: var(--teal-500); color: var(--teal-400); }
.codeblock-copy.done { border-color: var(--green-500); color: var(--green-500); }

.codeblock pre {
  padding: 18px 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.65;
  color: #c9d1d9;
  tab-size: 2;
}

/* Syntax tokens */
.hl-kw { color: #ff7b72; }
.hl-tp { color: #79c0ff; }
.hl-fn { color: #d2a8ff; }
.hl-st { color: #a5d6ff; }
.hl-nm { color: #ffa657; }
.hl-cm { color: #546178; font-style: italic; }

/* ── Callouts ──────────────────────────────────────── */
.callout {
  display: flex;
  gap: 14px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  margin: 16px 0;
  font-size: 0.9rem;
  line-height: 1.6;
  align-items: flex-start;
}

.callout-icon { font-size: 1.15rem; flex-shrink: 0; margin-top: 2px; }

.callout--tip {
  background: var(--teal-glow);
  border: 1px solid rgba(45,212,191,0.15);
  color: var(--teal-400);
}

.callout--warn {
  background: rgba(245,158,11,0.08);
  border: 1px solid rgba(245,158,11,0.15);
  color: var(--amber-500);
}

.callout--danger {
  background: rgba(239,68,68,0.08);
  border: 1px solid rgba(239,68,68,0.15);
  color: var(--red-500);
}

.callout--info {
  background: rgba(59,130,246,0.08);
  border: 1px solid rgba(59,130,246,0.15);
  color: var(--blue-500);
}

/* ── Glossary ──────────────────────────────────────── */
.glossary {
  display: grid;
  gap: 1px;
  background: var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 16px 0;
}

.glossary-item {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 16px;
  padding: 14px 20px;
  background: var(--bg-raised);
  font-size: 0.88rem;
  align-items: baseline;
}

.glossary-term {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--teal-400);
  font-size: 0.82rem;
}

.glossary-def { color: var(--text-secondary); }

/* ── Practice card ─────────────────────────────────── */
.practice {
  background: var(--bg-raised);
  border: 1px solid var(--teal-600);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin: 28px 0;
  position: relative;
  overflow: hidden;
}

.practice::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--teal-500), var(--green-500), var(--teal-500));
}

.practice-chip {
  display: inline-block;
  background: var(--teal-500);
  color: var(--text-inverse);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 4px 14px;
  border-radius: 5px;
  margin-bottom: 14px;
}

.practice-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.practice-steps {
  list-style: none;
  counter-reset: pstep;
  padding: 0;
}

.practice-steps li {
  counter-increment: pstep;
  padding: 14px 0 14px 48px;
  position: relative;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.9rem;
}

.practice-steps li:last-child { border-bottom: none; }

.practice-steps li::before {
  content: counter(pstep);
  position: absolute;
  left: 0; top: 14px;
  width: 30px; height: 30px;
  background: var(--teal-glow-md);
  color: var(--teal-400);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.78rem;
}

/* ── Challenge card ────────────────────────────────── */
.challenge {
  background: linear-gradient(135deg, rgba(168,85,247,0.06), rgba(59,130,246,0.06));
  border: 1px solid rgba(168,85,247,0.18);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin: 24px 0;
}

.challenge-chip {
  display: inline-block;
  background: rgba(168,85,247,0.15);
  color: var(--purple-500);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 4px 14px;
  border-radius: 5px;
  margin-bottom: 12px;
}

/* ── Checklist ─────────────────────────────────────── */
.checklist { list-style: none; padding: 0; margin: 16px 0; }

.checklist li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.9rem;
  cursor: pointer;
  transition: color 0.2s var(--ease);
  user-select: none;
}

.checklist li:last-child { border-bottom: none; }

.ck-box {
  width: 22px; height: 22px;
  border: 2px solid var(--border-strong);
  border-radius: 6px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: transparent;
  transition: all 0.2s var(--ease-bounce);
}

.checklist li.done .ck-box {
  background: var(--teal-500);
  border-color: var(--teal-500);
  color: var(--text-inverse);
}

.checklist li.done { color: var(--text-muted); text-decoration: line-through; }

/* ── Quiz ──────────────────────────────────────────── */
.quiz {
  background: var(--bg-raised);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin: 24px 0;
}

.quiz-heading {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.quiz-q {
  margin-bottom: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-subtle);
}

.quiz-q:last-of-type { border-bottom: none; margin-bottom: 12px; padding-bottom: 0; }

.quiz-q-text {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 0.92rem;
  margin-bottom: 14px;
}

.quiz-q-num { color: var(--teal-400); }

.quiz-opts { display: flex; flex-direction: column; gap: 8px; }

.quiz-opt {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 16px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.88rem;
  transition: all 0.2s var(--ease);
}

.quiz-opt:hover { border-color: var(--border-strong); background: rgba(255,255,255,0.015); }

.quiz-dot {
  width: 18px; height: 18px;
  border: 2px solid var(--border-strong);
  border-radius: 50%;
  flex-shrink: 0;
  position: relative;
  transition: all 0.2s var(--ease);
}

.quiz-opt.picked { border-color: var(--teal-500); background: var(--teal-glow); }
.quiz-opt.picked .quiz-dot { border-color: var(--teal-400); }
.quiz-opt.picked .quiz-dot::after {
  content: '';
  position: absolute;
  inset: 3px;
  background: var(--teal-400);
  border-radius: 50%;
}

.quiz-opt.right { border-color: var(--green-500); background: rgba(34,197,94,0.08); color: var(--green-500); }
.quiz-opt.wrong { border-color: var(--red-500); background: rgba(239,68,68,0.08); color: var(--red-500); }

.quiz-fb {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  margin-top: 10px;
  font-size: 0.82rem;
  display: none;
  line-height: 1.5;
}

.quiz-fb.show { display: block; }
.quiz-fb.ok { background: rgba(34,197,94,0.08); border: 1px solid rgba(34,197,94,0.15); color: var(--green-500); }
.quiz-fb.nope { background: rgba(239,68,68,0.08); border: 1px solid rgba(239,68,68,0.15); color: var(--red-500); }

.quiz-submit {
  background: linear-gradient(135deg, var(--teal-400), var(--teal-600));
  color: var(--text-inverse);
  border: none;
  padding: 13px 36px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-weight: 800;
  font-size: 0.92rem;
  cursor: pointer;
  transition: all 0.25s var(--ease);
  margin-top: 12px;
}

.quiz-submit:hover { transform: translateY(-2px); box-shadow: 0 6px 24px var(--teal-glow-lg); }

.quiz-result {
  text-align: center;
  padding: 24px;
  margin-top: 20px;
  border-radius: var(--radius-md);
  font-weight: 800;
  font-size: 1.05rem;
  display: none;
}

.quiz-result.show { display: block; }
.quiz-result.pass { background: rgba(34,197,94,0.08); border: 1px solid rgba(34,197,94,0.15); color: var(--green-500); }
.quiz-result.fail { background: rgba(245,158,11,0.08); border: 1px solid rgba(245,158,11,0.15); color: var(--amber-500); }

/* ── Bottom navigation ─────────────────────────────── */
.bottom-nav {
  display: flex;
  justify-content: space-between;
  padding: 36px 0 60px;
  margin-top: 20px;
  border-top: 1px solid var(--border-subtle);
  gap: 16px;
  flex-wrap: wrap;
}

.btn-nav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.88rem;
  text-decoration: none;
  transition: all 0.25s var(--ease);
  font-family: var(--font-body);
}

.btn-prev {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  color: var(--text-muted);
}
.btn-prev:hover { border-color: var(--border-strong); color: var(--text-primary); }

.btn-next {
  background: linear-gradient(135deg, var(--teal-400), var(--teal-600));
  color: var(--text-inverse);
}
.btn-next:hover { transform: translateY(-2px); box-shadow: 0 6px 24px var(--teal-glow-lg); }

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 640px) {
  .container { padding: 0 14px; }
  .mod-header { padding: 36px 0 28px; }
  .tab-btn { padding: 10px 14px; font-size: 0.82rem; }
  .card { padding: 20px; }
  .practice { padding: 22px; }
  .quiz { padding: 22px; }
  .glossary-item { grid-template-columns: 1fr; gap: 4px; }
  .bottom-nav { flex-direction: column; }
  .btn-nav { width: 100%; justify-content: center; }
  .topbar-nav { display: none; }
  .mod-stats { gap: 14px; }
}