/* AjudaTSM - estils */

[hidden] { display: none !important; }

:root {
  --font-head: "Montserrat", "Segoe UI", Arial, sans-serif;
  --font-body: "Open Sans", "Segoe UI", Arial, sans-serif;

  --bg: #ffffff;
  --bg-alt: #f5f8fd;
  --box: #ffffff;
  --line: #e1e6f0;
  --line-strong: #c9d1e0;
  --heading: #413e66;
  --text: #444444;
  --muted: #646284;
  --accent: #1bb1dc;
  --accent-dark: #08739a;
  --accent-darker: #065d7d;
  --accent-soft: #e8f6fb;
  --on-accent: #ffffff;
  --shadow: 0 0 30px rgba(214, 215, 216, 0.5);

  --ok: #1d7a45;
  --ok-soft: #eaf6ee;
  --bad: #b3242f;
  --bad-soft: #fcecee;

  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #0e0e10;
  --bg-alt: #141416;
  --box: #1b1b1e;
  --line: #2a2a2e;
  --line-strong: #3e3e44;
  --heading: #ececee;
  --text: #c9c9cd;
  --muted: #9c9ca3;
  --accent: #3cc3ea;
  --accent-dark: #3cc3ea;
  --accent-darker: #6dd3f0;
  --accent-soft: #15262d;
  --on-accent: #0b1418;
  --shadow: 0 0 24px rgba(0, 0, 0, 0.5);

  --ok: #6fcf94;
  --ok-soft: #13261b;
  --bad: #f08a92;
  --bad-soft: #2c1618;

  color-scheme: dark;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
}

a { color: var(--accent-dark); text-decoration: none; }
a:hover { color: var(--accent-darker); text-decoration: underline; }

h1, h2, h3 { font-family: var(--font-head); color: var(--heading); }

button { font-family: inherit; font-size: inherit; color: inherit; }

button:focus-visible, a:focus-visible, select:focus-visible, [tabindex="-1"]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

kbd {
  font-family: Consolas, Menlo, monospace;
  font-size: 12px;
  padding: 1px 5px;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  background: var(--box);
  color: var(--heading);
}

.container { max-width: 1000px; margin: 0 auto; padding: 0 20px; }

.app-layout { display: flex; flex-direction: column; min-height: 100vh; }

.skip-link {
  position: fixed; left: 10px; top: -60px; z-index: 100;
  padding: 8px 14px; background: var(--box); color: var(--heading); border: 2px solid var(--accent);
}
.skip-link:focus { top: 10px; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
  box-shadow: 0 2px 15px rgba(0, 0, 0, 0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 64px;
}

.logo {
  font-family: var(--font-head);
  font-size: 26px;
  font-weight: 300;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--heading);
  white-space: nowrap;
}
.logo span { font-weight: 600; color: var(--accent-dark); }
.logo:hover { color: var(--heading); text-decoration: none; }

.main-nav { display: flex; gap: 24px; margin-left: auto; }
.main-nav a {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--heading);
}
.main-nav a:hover { color: var(--accent-dark); text-decoration: none; }

.btn-icon {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: transparent;
  color: var(--heading);
  cursor: pointer;
  flex-shrink: 0;
}
.btn-icon:hover { border-color: var(--accent); color: var(--accent-dark); }

[data-theme="dark"] .theme-icon-dark,
[data-theme="light"] .theme-icon-light { display: none; }
.theme-icon-dark, .theme-icon-light { display: inline-flex; }

/* Intro */
.intro {
  background: var(--bg-alt);
  padding: 70px 0 64px;
}

.intro h1 {
  max-width: 640px;
  font-size: 40px;
  font-weight: 700;
  line-height: 1.25;
}
.intro h1 span { color: var(--accent-dark); }

.intro-text {
  max-width: 560px;
  margin: 16px 0 28px;
  font-size: 17px;
  color: var(--muted);
}

.btn-get-started, .btn-primary, .btn-next {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 11px 30px;
  border: 0;
  border-radius: 3px;
  background: var(--accent-dark);
  color: var(--on-accent);
  cursor: pointer;
  transition: background 0.3s;
}
.btn-get-started:hover, .btn-primary:hover, .btn-next:hover {
  background: var(--accent-darker);
  color: var(--on-accent);
  text-decoration: none;
}

/* Sobre aquesta web */
.about { padding: 60px 0; }
.about-inner > * { max-width: 760px; }

.section-title {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 8px;
}

.about-lead {
  font-family: var(--font-head);
  font-style: italic;
  font-size: 18px;
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 16px;
}

.about p + p { margin-top: 0; }

.check-list { list-style: none; margin-top: 18px; }
.check-list li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 10px;
}
.check-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 5px;
  width: 14px;
  height: 14px;
  border: 1.5px solid var(--accent);
  border-radius: 50%;
}
.check-list li::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  width: 4px;
  height: 7px;
  border: solid var(--accent);
  border-width: 0 1.5px 1.5px 0;
  transform: rotate(45deg);
}

/* Practica */
.practice {
  flex: 1;
  background: var(--bg-alt);
  padding: 60px 0;
}

.section-header { text-align: center; max-width: 680px; margin: 0 auto 30px; }
.section-header p { color: var(--muted); }

.topic-filters {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.filter-pill {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  padding: 16px 18px;
  text-align: left;
  background: var(--box);
  border: 1px solid transparent;
  border-top: 3px solid transparent;
  border-radius: 4px;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: border-color 0.2s;
}
.filter-pill:hover { border-top-color: var(--line-strong); }
.filter-pill.active { border-top-color: var(--accent); }

.pill-num {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 600;
  color: var(--heading);
}
.pill-label { font-size: 13px; line-height: 1.4; color: var(--text); }
.pill-count { margin-top: auto; padding-top: 6px; font-size: 12px; color: var(--muted); }
.pill-count::after { content: " preguntes"; }

.settings-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 14px;
  margin: 22px 0 18px;
}

.format-row { display: flex; align-items: center; gap: 8px; }
.format-row label { font-size: 13px; font-weight: 600; color: var(--heading); }
.format-row select {
  font: inherit;
  font-size: 14px;
  height: 36px;
  padding: 0 8px;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  background: var(--box);
  color: var(--text);
}

.btn-toggle {
  height: 36px;
  white-space: nowrap;
  padding: 0 14px;
  font-size: 13px;
  background: var(--box);
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  color: var(--text);
  cursor: pointer;
}
.btn-toggle strong { font-weight: 600; color: var(--heading); }
.btn-toggle:hover:not(:disabled) { border-color: var(--accent); }
.btn-review.has-failed { color: var(--bad); border-color: var(--bad); }
.btn-review:disabled { opacity: 0.55; cursor: default; }

.btn-link {
  min-height: 36px;
  padding: 0 4px;
  background: none;
  border: 0;
  font-size: 13px;
  color: var(--accent-dark);
  cursor: pointer;
}
.btn-link:hover { text-decoration: underline; }
#reset-btn { margin-left: auto; }

/* Caixa de la pregunta */
.quiz-box {
  background: var(--box);
  border-radius: 4px;
  box-shadow: var(--shadow);
}

.scoreboard {
  display: flex;
  align-items: center;
  gap: 30px;
  padding: 14px 30px;
  border-bottom: 1px solid var(--line);
}

.score-list { display: flex; gap: 22px; }
.stat-card { display: flex; align-items: baseline; gap: 6px; }
.stat-label { font-size: 13px; color: var(--muted); }
.stat-label::after { content: ":"; }
.stat-value { font-weight: 600; color: var(--heading); font-variant-numeric: tabular-nums; }
.stat-correct .stat-value { color: var(--ok); }
.stat-wrong .stat-value { color: var(--bad); }

.score-progress { flex: 1; display: flex; align-items: center; gap: 12px; min-width: 0; }
.progress-count { font-size: 13px; color: var(--muted); white-space: nowrap; font-variant-numeric: tabular-nums; }
.progress-bar-bg { flex: 1; height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; }
.progress-bar-fill { height: 100%; background: var(--accent); transition: width 0.3s; }

.quiz-card, .completion-card { padding: 28px 30px 32px; scroll-margin-top: 80px; }
.quiz-card:focus, .completion-card:focus { outline: none; }

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  margin-bottom: 14px;
  font-size: 13px;
  color: var(--muted);
}
.badge-topic { font-weight: 600; color: var(--accent-dark); }
.badge-id { margin-left: auto; }

.statement-text {
  font-size: 18px;
  line-height: 1.65;
  color: var(--heading);
  white-space: pre-line;
  overflow-wrap: anywhere;
}

.question-image {
  display: block;
  max-width: 100%;
  max-height: 440px;
  height: auto;
  margin: 18px auto 0;
  background: #fff;
  border: 1px solid var(--line);
}

/* Respostes */
.actions-container {
  display: flex;
  gap: 14px;
  margin-top: 26px;
}

.btn-action {
  min-width: 160px;
  height: 46px;
  padding: 0 24px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.5px;
  background: var(--box);
  border: 2px solid var(--line-strong);
  border-radius: 3px;
  color: var(--heading);
  cursor: pointer;
}
.btn-action:hover:not(:disabled) { border-color: var(--accent); color: var(--accent-dark); }
.btn-action:disabled { cursor: default; }

.multiple-actions { display: flex; flex-direction: column; gap: 10px; margin-top: 24px; }

.btn-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  width: 100%;
  padding: 12px 16px;
  text-align: left;
  line-height: 1.55;
  background: var(--box);
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  color: var(--text);
  cursor: pointer;
  overflow-wrap: anywhere;
}
.btn-option:hover:not(:disabled) { border-color: var(--accent); background: var(--accent-soft); }
.btn-option:disabled { cursor: default; }

.option-letter {
  flex-shrink: 0;
  font-family: var(--font-head);
  font-weight: 600;
  color: var(--heading);
}
.option-letter::after { content: ")"; }
.option-text { min-width: 0; white-space: pre-line; }

.btn-action.state-correct, .btn-option.state-correct {
  border-color: var(--ok);
  background: var(--ok-soft);
  color: var(--ok);
}
.btn-option.state-correct { color: var(--text); }
.btn-action.state-wrong-chosen, .btn-option.state-wrong-chosen {
  border-color: var(--bad);
  background: var(--bad-soft);
  color: var(--bad);
}
.btn-option.state-wrong-chosen { color: var(--text); }
.btn-action.state-dimmed, .btn-option.state-dimmed { opacity: 0.55; }

/* Explicació */
.explanation-card {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.explanation-header {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px 16px;
}
.explanation-header:focus { outline: none; }

.result-badge {
  display: inline-flex;
  gap: 6px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 600;
}
.result-badge.badge-success { color: var(--ok); }
.result-badge.badge-error { color: var(--bad); }

.verdict-tag { font-size: 14px; color: var(--muted); }
.verdict-tag strong { color: var(--heading); }

.explanation-content {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px dashed var(--line);
}

.explanation-heading {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  scroll-margin-top: 140px;
}
.explanation-heading:focus { outline: none; }

.explanation-text { font-size: 15px; line-height: 1.75; overflow-wrap: anywhere; }

.option-explanations { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.option-explanations li {
  padding: 2px 0 2px 14px;
  border-left: 3px solid var(--line);
  line-height: 1.65;
  overflow-wrap: anywhere;
}
.option-explanations li.correct-option { border-left-color: var(--ok); }
.option-explanations strong { color: var(--heading); }

.trap-text {
  padding: 12px 16px;
  background: var(--bg-alt);
  border-left: 3px solid var(--accent);
  line-height: 1.65;
  overflow-wrap: anywhere;
}
.trap-text::before { content: "Compte: "; font-weight: 600; color: var(--heading); }

.source-text { font-size: 13px; color: var(--muted); overflow-wrap: anywhere; }
.source-text::before { content: "Font: "; font-weight: 600; }
#answer-basis-text::before { content: "Base de la resposta: "; }

.tags-row { display: flex; flex-wrap: wrap; gap: 6px; }
.concept-tag {
  font-size: 12px;
  padding: 1px 8px;
  border: 1px solid var(--line);
  border-radius: 3px;
  color: var(--muted);
}

.explanation-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 16px;
}

/* Final de tanda */
.completion-title { font-size: 24px; font-weight: 600; }
.completion-subtitle { margin-top: 6px; color: var(--muted); }

.completion-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 24px 0;
}
.c-stat { padding: 14px 16px; background: var(--bg-alt); border-radius: 3px; }
.c-stat-lbl { font-size: 13px; color: var(--muted); }
.c-stat-val { font-family: var(--font-head); font-size: 26px; font-weight: 600; color: var(--heading); }

.completion-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }

.btn-secondary {
  padding: 10px 22px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  background: var(--box);
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  color: var(--heading);
  cursor: pointer;
}
.btn-secondary:hover { border-color: var(--accent); }

.study-intro { margin-top: 14px; font-size: 13px; color: var(--muted); text-align: center; }

.load-error { margin: 20px 30px; color: var(--bad); }

/* Peu */
.site-footer {
  padding: 24px 0 max(24px, env(safe-area-inset-bottom));
  background: var(--bg);
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
  text-align: center;
}
.footer-inner p + p { margin-top: 4px; }

/* Mòbil */
@media (max-width: 860px) {
  .topic-filters { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .header-inner { height: 56px; gap: 12px; }
  .logo { font-size: 21px; letter-spacing: 2px; }
  .main-nav { display: none; }
  .btn-icon { margin-left: auto; }

  .intro { padding: 44px 0; text-align: center; }
  .intro h1 { font-size: 28px; }
  .intro-text { font-size: 15px; margin: 14px auto 24px; }

  .about, .practice { padding: 40px 0; }
  .section-title { font-size: 23px; }
  .about-lead { font-size: 16px; }

  .topic-filters { grid-template-columns: repeat(4, 1fr); gap: 6px; }
  .filter-pill { align-items: center; text-align: center; gap: 0; padding: 10px 4px 9px; }
  .pill-num { font-size: 13px; }
  .pill-num-extra, .pill-label { display: none; }
  .pill-count { padding-top: 2px; }
  .pill-count::after { content: ""; }

  .settings-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 16px 0 14px; }
  .format-row { grid-column: 1 / -1; }
  .format-row select { flex: 1; height: 40px; }
  .btn-toggle { height: 40px; padding: 0 6px; }
  #reset-btn { grid-column: 1 / -1; justify-self: end; margin: -4px 0 0; }

  .scoreboard { flex-direction: column; align-items: stretch; gap: 8px; padding: 12px 16px; }
  .score-list { justify-content: space-between; gap: 8px; }
  .stat-card { flex-direction: column; gap: 0; }
  .stat-label::after { content: ""; }

  .quiz-card, .completion-card { padding: 20px 16px 24px; }
  .statement-text { font-size: 16px; }
  .badge-id { margin-left: 0; }

  .actions-container { gap: 10px; margin-top: 22px; }
  .actions-container .btn-action { flex: 1; min-width: 0; height: 54px; padding: 0 10px; font-size: 16px; }
  .btn-option { padding: 11px 12px; }
  .explanation-actions > button { flex: 1; padding-left: 8px; padding-right: 8px; }

  .completion-stats { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .completion-actions > button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}