/* Karten – Designsystem „Karteikasten“
   desk   #edf1f4  Seitenhintergrund (kühles helles Grau-Blau)
   paper  #fbfbf8  Kartenflächen
   ink    #26323c  Text
   pencil #6b7a87  Nebentext
   ballpoint #3056a0  Akzent / Primäraktionen
   redline   #d9534a  Kopflinie der Indexkarte, „Nochmal“ */

:root {
  --desk: #edf1f4;
  --paper: #fbfbf8;
  --ink: #26323c;
  --pencil: #6b7a87;
  --ballpoint: #3056a0;
  --ballpoint-soft: #e3eaf6;
  --redline: #d9534a;
  --redline-soft: #fae7e5;
  --amber: #a06c1f;
  --amber-soft: #f7ecd8;
  --green: #3e7d55;
  --green-soft: #e0efe5;
  --line: #dde4e9;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(38, 50, 60, 0.06), 0 4px 14px rgba(38, 50, 60, 0.07);
  --font-ui: ui-rounded, "SF Pro Rounded", system-ui, -apple-system, "Segoe UI",
    Roboto, sans-serif;
  --font-word: Charter, "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
  color-scheme: light;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--desk);
  color: var(--ink);
  font-family: var(--font-ui);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ---- Kopfzeile ---- */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.9rem 1.25rem;
}

.brand {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  color: var(--ink);
  text-decoration: none;
}

.container {
  max-width: 40rem;
  margin: 0 auto;
  padding: 0.5rem 1.25rem 3rem;
}

.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0.5rem 0 1.25rem;
}

/* ---- Bausteine ---- */
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.btn {
  display: inline-block;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.55rem 1.1rem;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  text-align: center;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
}

.btn-primary {
  background: var(--ballpoint);
  color: #fff;
}

.btn-primary:hover { background: #274b8c; }

.btn-quiet {
  border-color: var(--line);
  background: var(--paper);
  color: var(--pencil);
}

.btn-quiet:hover { color: var(--ink); }

.btn-danger:hover { color: var(--redline); border-color: var(--redline); }

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

.flash {
  border-radius: var(--radius);
  padding: 0.7rem 1rem;
  margin: 0 0 1rem;
  background: var(--green-soft);
  color: var(--green);
}

.flash-error { background: var(--redline-soft); color: var(--redline); }

.empty {
  color: var(--pencil);
  max-width: 32rem;
}

/* ---- Formulare ---- */
.form-stack { display: grid; gap: 0.35rem; }

.form-stack label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--pencil);
  margin-top: 0.5rem;
}

.form-stack input,
.form-stack select {
  font: inherit;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.6rem 0.75rem;
}

.form-stack .btn { margin-top: 1rem; }

/* ---- Anmeldung ---- */
.login {
  max-width: 22rem;
  margin: 12vh auto 0;
}

.login-title {
  font-size: 2rem;
  margin: 0;
  text-align: center;
}

.login-sub {
  color: var(--pencil);
  text-align: center;
  margin: 0.25rem 0 1.5rem;
}

/* ---- Lektionen ---- */
.lesson-list {
  list-style: none;
  margin: 0 0 2rem;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.lesson-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
}

.lesson-name { font-size: 1.15rem; margin: 0; }

.lesson-direction {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--pencil);
  white-space: nowrap;
}

.lesson-meta {
  color: var(--pencil);
  font-size: 0.9rem;
  margin: 0.25rem 0 1rem;
}

.lesson-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.lesson-actions form { display: contents; }

.file-btn { position: relative; overflow: hidden; }

.file-btn input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.new-lesson summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--ballpoint);
  margin-bottom: 0.75rem;
}

/* ---- Lernen: die Indexkarte ---- */
.study-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  margin: 0.25rem 0 1rem;
}

.study-lesson {
  font-size: 1rem;
  font-weight: 700;
  margin: 0;
}

.study-progress {
  font-size: 0.85rem;
  color: var(--pencil);
  white-space: nowrap;
}

.sync-badge {
  font-size: 0.78rem;
  color: var(--pencil);
}

.sync-badge[data-offline="true"] { color: var(--amber); font-weight: 600; }

/* Die Karteikarte: Papier mit Linierung und roter Kopflinie */
.index-card {
  position: relative;
  width: 100%;
  min-height: 16rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  background:
    linear-gradient(var(--redline) 0, var(--redline) 0) no-repeat 0 3.2rem / 100% 2px,
    repeating-linear-gradient(
      transparent 0,
      transparent calc(2rem - 1px),
      #e7ecef calc(2rem - 1px),
      #e7ecef 2rem
    ) 0 3.2rem,
    var(--paper);
  display: grid;
  place-items: center;
  padding: 3rem 1.5rem 2rem;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.index-card:active { transform: scale(0.995); }

.card-label {
  position: absolute;
  top: 0.85rem;
  left: 1.25rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--pencil);
}

.card-word {
  font-family: var(--font-word);
  font-size: clamp(1.8rem, 7vw, 2.6rem);
  text-align: center;
  overflow-wrap: anywhere;
  margin: 0;
}

.card-answer {
  font-family: var(--font-word);
  font-size: clamp(1.3rem, 5vw, 1.9rem);
  color: var(--ballpoint);
  text-align: center;
  overflow-wrap: anywhere;
  margin: 0.75rem 0 0;
}

.card-hint {
  position: absolute;
  bottom: 0.8rem;
  font-size: 0.8rem;
  color: var(--pencil);
}

/* ---- Bewertungs-Buttons ---- */
.ratings {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
  margin-top: 1rem;
}

.rating {
  border: none;
  border-radius: 12px;
  padding: 0.6rem 0.25rem 0.5rem;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  display: grid;
  gap: 0.1rem;
}

.rating small {
  font-weight: 500;
  font-size: 0.72rem;
  opacity: 0.75;
}

.rating-1 { background: var(--redline-soft); color: var(--redline); }
.rating-2 { background: var(--amber-soft); color: var(--amber); }
.rating-3 { background: var(--ballpoint-soft); color: var(--ballpoint); }
.rating-4 { background: var(--green-soft); color: var(--green); }

.rating:hover { filter: brightness(0.97); }

/* ---- Sitzungsende ---- */
.done {
  text-align: center;
  padding: 3rem 1.5rem;
}

.done h2 { margin: 0 0 0.5rem; }

.done p { color: var(--pencil); margin: 0 0 1.5rem; }

@media (prefers-reduced-motion: no-preference) {
  .index-card { transition: transform 120ms ease; }
}