/* ==========================================================================
   KLW IT-Anleitungen — Design System
   Display: Archivo · Body: IBM Plex Sans · Utility: IBM Plex Mono
   ========================================================================== */

@font-face {
  font-family: "Archivo";
  src: url("../fonts/archivo-variable.woff2") format("woff2");
  font-weight: 700 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Plex Sans";
  src: url("../fonts/plexsans-variable.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Plex Mono";
  src: url("../fonts/plexmono-500.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Plex Mono";
  src: url("../fonts/plexmono-600.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

:root {
  /* --- Brand palette (sampled from ksimlee.ch) --- */
  --blue: #009ee0;
  --blue-ink: #00658f;
  --pink: #e30059;
  --pink-ink: #a8003f;
  --yellow: #ffcc00;
  --yellow-ink: #7a5f00;
  --green: #1e7a34;
  --red: #cf2b26;

  /* --- Neutrals --- */
  --ink: #12213a;
  --ink-soft: #48566e;
  --ink-faint: #7c879b;
  --paper: #f2f5f6;
  --surface: #ffffff;
  --line: #dbe3e6;
  --line-strong: #b9c5ca;

  /* --- Type --- */
  --f-display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --f-body: "Plex Sans", "Helvetica Neue", Arial, sans-serif;
  --f-mono: "Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* --- Layout --- */
  --content-width: 1120px;
  --radius: 10px;
  --shadow-card: 0 1px 2px rgba(18, 33, 58, 0.06), 0 6px 20px -8px rgba(18, 33, 58, 0.12);
  --shadow-card-hover: 0 2px 4px rgba(18, 33, 58, 0.08), 0 14px 32px -10px rgba(18, 33, 58, 0.18);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--blue-ink); text-decoration-thickness: 1.5px; text-underline-offset: 2px; }
a:hover { color: var(--blue); }
h1, h2, h3, h4 { font-family: var(--f-display); color: var(--ink); line-height: 1.1; margin: 0; }
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.3em; }
table { border-collapse: collapse; width: 100%; }
code, kbd, .mono { font-family: var(--f-mono); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 1rem; top: -3rem; background: var(--ink); color: #fff;
  padding: 0.6em 1em; border-radius: 6px; z-index: 100; transition: top 0.15s ease;
}
.skip-link:focus { top: 1rem; }

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
  border-radius: 4px;
}

.wrap { max-width: var(--content-width); margin: 0 auto; padding: 0 1.5rem; }

/* ---------- Masthead ---------- */
.masthead {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.masthead__bar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 0.9rem 0;
}
.masthead__brand { display: flex; align-items: center; gap: 0.85rem; min-width: 0; }
.masthead__logo { height: 30px; width: auto; flex: none; }
.masthead__divider { width: 1px; height: 26px; background: var(--line-strong); flex: none; }
.masthead__title {
  font-family: var(--f-display); font-weight: 800; font-size: 1.05rem;
  letter-spacing: 0.01em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.masthead__back {
  font-family: var(--f-body); font-weight: 600; font-size: 0.9rem;
  color: var(--ink-soft); text-decoration: none; white-space: nowrap;
}
.masthead__back:hover { color: var(--blue); }
.masthead__back svg { vertical-align: -2px; margin-right: 0.3em; }
.masthead__site-link {
  font-size: 0.82rem; color: var(--ink-faint); text-decoration: none; flex: none;
}
.masthead__site-link:hover { color: var(--blue); }

/* ---------- Intro / hero band ---------- */
.intro {
  padding: 2.6rem 0 2rem;
  border-bottom: 1px solid var(--line);
}
.intro__grid {
  display: grid; grid-template-columns: 1.4fr 1fr; gap: 2.5rem; align-items: start;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 0.5em;
  font-family: var(--f-mono); font-weight: 600; font-size: 0.78rem;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--blue-ink);
  margin: 0 0 0.7rem;
}
.eyebrow::before {
  content: ""; width: 9px; height: 9px; background: var(--yellow);
  clip-path: polygon(0 0, 100% 0, 0 100%); flex: none;
}
.intro h1 {
  font-size: clamp(1.9rem, 3.4vw, 2.7rem);
  font-weight: 900; letter-spacing: -0.01em; margin-bottom: 0.6rem;
}
.intro__lede { font-size: 1.08rem; color: var(--ink-soft); max-width: 46ch; }

.contact-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.2rem 1.3rem; box-shadow: var(--shadow-card);
}
.contact-card h2 {
  font-size: 0.78rem; font-family: var(--f-mono); font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.07em; color: var(--ink-faint);
  margin-bottom: 0.8rem;
}
.contact-card dl { margin: 0; display: grid; gap: 0.55rem; }
.contact-card div { display: flex; gap: 0.6rem; font-size: 0.92rem; }
.contact-card dt { flex: none; width: 1.4em; text-align: center; }
.contact-card dd { margin: 0; color: var(--ink-soft); }
.contact-card a { color: var(--ink); font-weight: 600; }
.contact-card a:hover { color: var(--blue); }

/* ---------- Control bar: audience toggle + search ---------- */
.control-bar {
  position: sticky; top: 0; z-index: 20;
  background: rgba(242, 245, 246, 0.92);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.control-bar__inner {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 0.9rem; padding: 0.85rem 0;
}
.toggle {
  display: inline-flex; border: 1px solid var(--line-strong); border-radius: 999px;
  background: var(--surface); padding: 3px; gap: 2px;
}
.toggle input { position: absolute; opacity: 0; pointer-events: none; }
.toggle label {
  position: relative; display: inline-flex; align-items: center; gap: 0.45em;
  padding: 0.42rem 0.95rem; border-radius: 999px; font-size: 0.88rem; font-weight: 600;
  color: var(--ink-soft); cursor: pointer; user-select: none;
  transition: background 0.15s ease, color 0.15s ease;
}
.toggle label .dot { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.toggle label[data-flag="student"] .dot { background: var(--blue); }
.toggle label[data-flag="teacher"] .dot { background: var(--pink); }
.toggle label[data-flag="all"] .dot {
  background: linear-gradient(135deg, var(--blue) 50%, var(--pink) 50%);
}
.toggle input:checked + label { background: var(--ink); color: #fff; }
.toggle input:focus-visible + label { outline: 3px solid var(--blue); outline-offset: 2px; }

.search { position: relative; flex: 1 1 240px; max-width: 320px; }
.search input {
  width: 100%; padding: 0.55rem 0.9rem 0.55rem 2.1rem; border-radius: 999px;
  border: 1px solid var(--line-strong); background: var(--surface);
  font-family: var(--f-body); font-size: 0.9rem; color: var(--ink);
}
.search input::placeholder { color: var(--ink-faint); }
.search svg {
  position: absolute; left: 0.75rem; top: 50%; transform: translateY(-50%);
  width: 15px; height: 15px; color: var(--ink-faint); pointer-events: none;
}
.result-count {
  font-family: var(--f-mono); font-size: 0.78rem; color: var(--ink-faint);
  white-space: nowrap;
}

/* ---------- Category sections & cards ---------- */
.categories { padding: 2.2rem 0 4rem; }
.category { margin-bottom: 2.6rem; }
.category[hidden] { display: none; }
.category__head {
  display: flex; align-items: baseline; gap: 0.9rem; margin-bottom: 1.1rem;
}
.category__head h2 {
  font-size: 1.3rem; font-weight: 800; letter-spacing: -0.005em; white-space: nowrap;
}
.category__rule { flex: 1; height: 1px; background: var(--line-strong); }
.category__count {
  font-family: var(--f-mono); font-size: 0.78rem; color: var(--ink-faint); white-space: nowrap;
}

.card-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem;
}

.card {
  position: relative; display: block; background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.3rem 1.3rem 1.15rem; text-decoration: none; color: inherit;
  box-shadow: var(--shadow-card); overflow: hidden;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.card[hidden] { display: none; }
.card:hover, .card:focus-visible {
  transform: translateY(-2px); box-shadow: var(--shadow-card-hover);
  border-color: var(--line-strong);
}
.card:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }

/* Signature element: folded corner "audience flag" — echoes KSIL's origami mark */
.flag {
  position: absolute; top: 0; right: 0; width: 46px; height: 46px;
  clip-path: polygon(100% 0, 0 0, 100% 100%);
}
.flag[data-audience="student"] { background: var(--blue); }
.flag[data-audience="teacher"] { background: var(--pink); }
.flag[data-audience="both"] { background: linear-gradient(135deg, var(--blue) 50%, var(--pink) 50%); }
.flag__label {
  position: absolute; top: 5px; right: 5px; font-family: var(--f-mono);
  font-size: 0.6rem; font-weight: 600; color: #fff; letter-spacing: 0.02em;
}

.card__icon { font-size: 1.7rem; line-height: 1; margin-bottom: 0.7rem; }
.card__title {
  font-size: 1.06rem; font-weight: 700; font-family: var(--f-body);
  margin-bottom: 0.4rem; padding-right: 2rem;
}
.card__dek { font-size: 0.89rem; color: var(--ink-soft); margin-bottom: 0.9rem; }
.card__meta {
  display: flex; align-items: center; gap: 0.5rem; font-size: 0.76rem;
  color: var(--ink-faint); font-family: var(--f-mono);
}
.card__meta .sep { opacity: 0.5; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line); padding: 2.2rem 0; background: var(--surface);
}
.site-footer__inner {
  display: flex; flex-wrap: wrap; gap: 1.2rem; justify-content: space-between; align-items: center;
}
.site-footer p { margin: 0; font-size: 0.85rem; color: var(--ink-faint); }
.site-footer a { color: var(--ink-soft); font-weight: 600; }
.site-footer__contact { font-size: 0.85rem; color: var(--ink-soft); }

/* ==========================================================================
   Tutorial page
   ========================================================================== */

.tutorial-header { padding: 2.2rem 0 1.8rem; border-bottom: 1px solid var(--line); background: var(--surface); }
.tutorial-header__top {
  display: flex; align-items: center; gap: 0.7rem; margin-bottom: 1rem; flex-wrap: wrap;
}
.tutorial-header__icon { font-size: 2.1rem; line-height: 1; }
.tutorial-header h1 {
  font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 900; letter-spacing: -0.01em;
}
.tutorial-meta {
  display: flex; flex-wrap: wrap; gap: 0.5rem 1.3rem; font-size: 0.86rem; color: var(--ink-soft);
}
.tutorial-meta__item { display: flex; align-items: center; gap: 0.4em; }
.tutorial-meta__item svg { flex: none; color: var(--ink-faint); }

.audience-badges { display: flex; gap: 0.5rem; margin-top: 1.1rem; }
.badge {
  display: inline-flex; align-items: center; gap: 0.4em; padding: 0.3rem 0.7rem;
  border-radius: 999px; font-size: 0.78rem; font-weight: 600; font-family: var(--f-mono);
}
.badge .dot { width: 7px; height: 7px; border-radius: 50%; }
.badge--student { background: #e5f6ff; color: var(--blue-ink); }
.badge--student .dot { background: var(--blue); }
.badge--teacher { background: #fde6ee; color: var(--pink-ink); }
.badge--teacher .dot { background: var(--pink); }

.tutorial-body { padding: 2.4rem 0 4rem; }
.tutorial-grid { display: grid; grid-template-columns: 1fr 280px; gap: 2.8rem; align-items: start; }

.tutorial-main section { margin-bottom: 2.4rem; }
.tutorial-main h2 {
  font-size: 1.28rem; font-weight: 800; margin-bottom: 0.9rem;
  padding-top: 0.2rem; scroll-margin-top: 5.5rem;
}
.tutorial-main h3 {
  font-size: 1.03rem; font-weight: 700; margin: 1.3rem 0 0.6rem;
}
.tutorial-main p { color: var(--ink-soft); }
.tutorial-main li { color: var(--ink-soft); margin-bottom: 0.35rem; }

.steps { list-style: none; padding: 0; margin: 0 0 1rem; counter-reset: step; }
.steps > li {
  counter-increment: step; position: relative; padding: 0 0 1.1rem 2.6rem;
  border-left: 2px solid var(--line); margin-left: 0.95rem;
}
.steps > li:last-child { padding-bottom: 0; border-color: transparent; }
.steps > li::before {
  content: counter(step); position: absolute; left: -1rem; top: -0.1rem;
  width: 1.9rem; height: 1.9rem; border-radius: 50%; background: var(--ink);
  color: #fff; font-family: var(--f-mono); font-weight: 600; font-size: 0.85rem;
  display: flex; align-items: center; justify-content: center;
}
.steps > li strong { color: var(--ink); }

.callout {
  border-radius: 8px; padding: 0.9rem 1.1rem; margin: 1rem 0 1.4rem;
  border-left: 4px solid; font-size: 0.93rem; display: flex; gap: 0.7rem;
}
.callout p:last-child { margin-bottom: 0; }
.callout__icon { flex: none; font-size: 1.05rem; line-height: 1.4; }
.callout--warning { background: #fff8e1; border-color: var(--yellow); color: #6b5300; }
.callout--tip { background: #e5f6ff; border-color: var(--blue); color: var(--blue-ink); }

.quicklinks {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; margin-bottom: 1.6rem;
}
.quicklinks caption {
  text-align: left; font-family: var(--f-mono); font-size: 0.76rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-faint);
  padding: 0.8rem 1.1rem 0.5rem;
}
.quicklinks td { padding: 0.6rem 1.1rem; border-top: 1px solid var(--line); font-size: 0.9rem; }
.quicklinks tr:first-child td { border-top: none; }
.quicklinks td:first-child { color: var(--ink-soft); white-space: nowrap; }
.quicklinks a { font-weight: 600; }

.shot {
  border: 1px solid var(--line); border-radius: 8px; overflow: hidden;
  margin: 1rem 0 1.4rem; background: var(--surface); box-shadow: var(--shadow-card);
}
.shot img { width: 100%; }
.shot figcaption {
  padding: 0.55rem 0.9rem; font-size: 0.8rem; color: var(--ink-faint);
  border-top: 1px solid var(--line); font-family: var(--f-mono);
}
.shot-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 640px) { .shot-row { grid-template-columns: 1fr; } }

.faq { border-top: 1px solid var(--line); }
.faq__item { border-bottom: 1px solid var(--line); padding: 0.9rem 0; }
.faq__item summary {
  cursor: pointer; font-weight: 700; font-size: 0.96rem; list-style: none;
  display: flex; align-items: center; gap: 0.6rem;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::before {
  content: ""; flex: none; width: 8px; height: 8px; background: var(--red);
  clip-path: polygon(0 0, 100% 0, 0 100%); transition: transform 0.15s ease;
}
.faq__item[open] summary::before { transform: rotate(90deg); }
.faq__item p { margin: 0.7rem 0 0; padding-left: 1.4rem; }
.faq__item ul { padding-left: 1.4rem; margin-top: 0.6rem; }

.changelog { font-size: 0.86rem; }
.changelog th {
  text-align: left; font-family: var(--f-mono); font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--ink-faint); padding: 0 1rem 0.5rem 0; font-weight: 600;
}
.changelog td { padding: 0.5rem 1rem 0.5rem 0; border-top: 1px solid var(--line); color: var(--ink-soft); }
.changelog td:first-child { font-family: var(--f-mono); white-space: nowrap; color: var(--ink); }

.tutorial-aside { position: sticky; top: 5.5rem; display: grid; gap: 1.1rem; }
.aside-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.1rem 1.2rem; box-shadow: var(--shadow-card);
}
.aside-card h2 {
  font-size: 0.76rem; font-family: var(--f-mono); font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--ink-faint); margin-bottom: 0.75rem;
}
.aside-card nav ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.5rem; }
.aside-card nav a { font-size: 0.88rem; color: var(--ink-soft); text-decoration: none; font-weight: 600; }
.aside-card nav a:hover { color: var(--blue); }
.aside-card .help-btn {
  display: block; text-align: center; margin-top: 0.9rem; padding: 0.6rem 1rem;
  background: var(--ink); color: #fff; border-radius: 8px; font-weight: 700;
  font-size: 0.88rem; text-decoration: none;
}
.aside-card .help-btn:hover { background: var(--blue-ink); color: #fff; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .intro__grid { grid-template-columns: 1fr; gap: 1.6rem; }
  .tutorial-grid { grid-template-columns: 1fr; }
  .tutorial-aside { position: static; }
}
@media (max-width: 760px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .card-grid { grid-template-columns: 1fr; }
  .masthead__title { display: none; }
  .control-bar__inner { flex-direction: column; align-items: stretch; }
  .search { max-width: none; }
  .toggle { overflow-x: auto; }
}