:root {
  --bg: #f3f4f7;
  --surface: #ffffff;
  --column: #e9ebf0;
  --hover: #f6f7fa;
  --text: #1d2125;
  --muted: #626f86;
  --border: #d9dde4;
  --accent: #6d4aff;
  --accent-hover: #5a37ec;
  --accent-soft: #ece8ff;
  --on-accent: #ffffff;
  --danger: #c9372c;
  --warn: #a54800;
  --warn-soft: #fff1dc;
  --danger-soft: #ffe7e4;
  --ok: #1f845a;
  --ok-soft: #dcfff1;
  --shadow: 0 1px 1px rgba(9, 30, 66, .12), 0 0 1px rgba(9, 30, 66, .25);
  --shadow-lg: 0 12px 32px rgba(9, 30, 66, .25);
  --label-l: 88%;
  --label-text-l: 24%;
  --radius: 10px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171c;
    --surface: #23272f;
    --column: #1c1f26;
    --hover: #2b303a;
    --text: #e4e7ec;
    --muted: #9ba5b4;
    --border: #363c47;
    --accent: #8f78ff;
    --accent-hover: #a391ff;
    --accent-soft: #2f2852;
    --warn: #f5a35c;
    --warn-soft: #3d2a12;
    --danger: #ff8b7f;
    --danger-soft: #42201c;
    --ok: #6fdcaa;
    --ok-soft: #173528;
    --shadow: 0 1px 1px rgba(0, 0, 0, .4), 0 0 1px rgba(0, 0, 0, .6);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, .6);
    --label-l: 28%;
    --label-text-l: 86%;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, sans-serif;
}

a { color: var(--accent); }

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

input, select, textarea {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 10px;
  min-width: 0;
}

textarea { resize: vertical; width: 100%; }

input:focus, select:focus, textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
  border-color: transparent;
}

button {
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 8px;
  padding: 7px 12px;
}
button:hover { background: var(--hover); }
button:focus-visible, a:focus-visible, .card:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

button.primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); font-weight: 600; }
button.primary:hover { background: var(--accent-hover); }
button.ghost { background: transparent; border-color: transparent; color: var(--muted); }
button.ghost:hover { background: var(--hover); color: var(--text); }
button.danger { color: var(--danger); border-color: var(--danger); background: transparent; }
button.danger:hover { background: var(--danger-soft); }
button.icon {
  border: none; background: transparent; padding: 2px 7px; color: var(--muted); border-radius: 6px; line-height: 1.4;
}
button.icon:hover { background: var(--hover); color: var(--text); }
button.small, .small { font-size: 14px; }
button.tiny { font-size: 12px; padding: 0 4px; }

.muted { color: var(--muted); }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.empty { color: var(--muted); text-align: center; padding: 48px 16px; }

/* ---------- top bar ---------- */
#topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  min-height: 58px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; color: var(--text); text-decoration: none; }
.brand img { width: 26px; height: 26px; }
.board-title {
  font-weight: 650; font-size: 18px; background: none; border: none; padding: 4px 6px;
  max-width: 360px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.tabs { display: flex; gap: 2px; background: var(--column); padding: 3px; border-radius: 9px; }
.tabs a {
  padding: 4px 12px; border-radius: 7px; color: var(--muted); text-decoration: none; font-weight: 500;
}
.tabs a.active { background: var(--surface); color: var(--text); box-shadow: var(--shadow); }
.spacer { flex: 1; }
.search { width: 160px; }
.me { display: flex; align-items: center; gap: 6px; border: none; background: transparent; padding: 4px 8px; }

/* ---------- main ---------- */
#main { flex: 1; overflow: auto; min-height: 0; }

.center-card {
  max-width: 420px; margin: 10vh auto; padding: 28px; background: var(--surface);
  border-radius: 14px; box-shadow: var(--shadow-lg);
}
.center-card h1 { margin-top: 0; }
.center-card form { display: flex; gap: 8px; margin-top: 16px; }
.center-card input { flex: 1; }

/* ---------- home ---------- */
.home { max-width: 1040px; margin: 0 auto; padding: 32px 16px; }
.home h1 { margin: 0 0 4px; }
.board-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; margin-top: 24px; }
.board-tile {
  display: flex; flex-direction: column; justify-content: space-between; gap: 18px; min-height: 110px;
  padding: 16px; border-radius: 12px; text-decoration: none; color: var(--text);
  background: var(--surface); box-shadow: var(--shadow); border-top: 4px solid var(--accent);
}
.board-tile:hover { box-shadow: var(--shadow-lg); }
div.board-tile { position: relative; justify-content: flex-start; gap: 6px; }
.tile-link { color: var(--text); text-decoration: none; flex: 1; }
.tile-link::after { content: ""; position: absolute; inset: 0; border-radius: 12px; }
.tile-actions { position: relative; z-index: 1; margin-top: 6px; }
.home-head h1 { margin: 0; }
.teacher-link { margin-top: 32px; }
.badge.teacher { color: var(--accent); background: var(--accent-soft); font-weight: 600; }
.board-tile strong { font-size: 18px; }
.new-board {
  display: flex; flex-direction: column; gap: 8px; padding: 16px; border-radius: 12px;
  border: 2px dashed var(--border);
}
.new-board h2 { margin: 0; font-size: 17px; }
.import { font-size: 14px; color: var(--muted); cursor: pointer; text-decoration: underline; }
.import input { display: none; }

/* ---------- board ---------- */
.board {
  display: flex; align-items: stretch; padding: 12px 8px 0; height: 100%;
  overflow-x: auto;
}
/* Columns sit directly on the background, separated by thin lines */
.column {
  flex: none; width: 316px; display: flex; flex-direction: column; min-height: 0;
  padding: 0 6px 12px; border-right: 1px solid var(--border);
}
.column.dragging { opacity: .4; }
.column.over-limit { box-shadow: inset 0 3px 0 var(--warn); }
.col-head { display: flex; align-items: center; gap: 6px; padding: 10px 10px 6px 14px; cursor: grab; }
.col-head h3 { margin: 0; font-size: 16px; flex: 1; overflow-wrap: anywhere; }
.count { font-size: 13px; color: var(--muted); background: var(--column); padding: 0 7px; border-radius: 99px; }
.over-limit .count { color: var(--warn); background: var(--warn-soft); font-weight: 700; }
.col-body { display: flex; flex-direction: column; gap: 8px; padding: 4px 8px; overflow-y: auto; min-height: 12px; }
.column footer { padding: 8px 8px 0; }
/* Plain text link look: lines up with the column title, only brightens on hover */
.add-btn {
  border: none; background: transparent; color: var(--muted); padding: 0; margin-left: 6px;
  border-radius: 0; text-align: left;
}
.add-btn:hover { background: transparent; color: var(--text); }
.add-column { flex: none; width: 316px; padding: 10px 14px; }
.inline-add { display: flex; flex-direction: column; gap: 6px; }

.placeholder { height: 40px; border-radius: 8px; border: 2px dashed var(--accent); background: var(--accent-soft); flex: none; }
.col-placeholder { width: 316px; align-self: stretch; border-radius: 8px; border: 2px dashed var(--accent); background: var(--accent-soft); flex: none; }

.card {
  background: var(--surface); border-radius: 8px; box-shadow: var(--shadow); padding: 10px 12px;
  cursor: pointer; border-left: 3px solid transparent;
}
.card:hover { background: var(--hover); }
.card.dragging { opacity: .4; }
.card.prio-3 { border-left-color: var(--danger); }
.card.prio-2 { border-left-color: var(--warn); }
.card-title { overflow-wrap: anywhere; }
.card-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 5px; margin-top: 6px; }
.card-meta:empty { display: none; }
.labels { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 5px; }

.label {
  display: inline-flex; align-items: center; font-size: 13px; font-weight: 600; padding: 1px 8px;
  border-radius: 99px; border: none; cursor: pointer;
  background: hsl(var(--h) 70% var(--label-l)); color: hsl(var(--h) 60% var(--label-text-l));
}
.label:hover { filter: brightness(.95); }

.badge { font-size: 13px; color: var(--muted); padding: 0 6px; border-radius: 5px; background: var(--column); }
.badge.ok { color: var(--ok); background: var(--ok-soft); }
.badge.due.soon { color: var(--warn); background: var(--warn-soft); }
.badge.due.overdue { color: var(--danger); background: var(--danger-soft); font-weight: 600; }
.badge.prio-3 { color: var(--danger); background: var(--danger-soft); }
.badge.prio-2 { color: var(--warn); background: var(--warn-soft); }
.avatars { display: flex; margin-left: auto; }
.avatars .avatar + .avatar { margin-left: -6px; }

.avatar {
  display: inline-grid; place-items: center; flex: none; width: 26px; height: 26px; border-radius: 50%;
  font-size: 12px; font-weight: 700; letter-spacing: .02em;
  background: hsl(var(--h) 65% 45%); color: #fff; border: 2px solid var(--surface);
}

/* ---------- menu ---------- */
.menu {
  position: fixed; z-index: 50; min-width: 190px; padding: 5px; display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px; box-shadow: var(--shadow-lg);
}
.menu button { border: none; background: transparent; text-align: left; border-radius: 6px; }
.menu button:hover { background: var(--hover); }
.menu .danger-text { color: var(--danger); }

/* ---------- card dialog ---------- */
.overlay {
  position: fixed; inset: 0; z-index: 40; background: rgba(9, 13, 25, .55);
  display: flex; justify-content: center; align-items: flex-start; padding: 5vh 16px; overflow-y: auto;
}
.dialog {
  width: 100%; max-width: 940px; background: var(--surface); border-radius: 14px; box-shadow: var(--shadow-lg);
  padding: 18px 20px 22px;
}
.dialog-head { display: flex; align-items: flex-start; gap: 8px; }
.title-input {
  flex: 1; font-size: 22px; font-weight: 650; border-color: transparent; background: transparent; resize: none;
  padding: 4px 8px;
}
.title-input:hover { background: var(--hover); }
.dialog-sub { margin: 0 8px 12px; font-size: 15px; }
.dialog-body { display: grid; grid-template-columns: minmax(0, 1fr) 260px; gap: 24px; }
.dialog h4 { margin: 18px 0 8px; font-size: 14px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
.dialog h4:first-child { margin-top: 4px; }
.side-col { display: flex; flex-direction: column; gap: 4px; }
.side-col select, .side-col input[type=date] { width: 100%; }
.side-col .danger { margin-top: 18px; }

.desc-text {
  white-space: pre-wrap; overflow-wrap: anywhere; padding: 8px 10px; border-radius: 8px; cursor: text;
  background: var(--hover);
}
.desc-placeholder { width: 100%; text-align: left; padding: 14px 10px; background: var(--hover); border: none; color: var(--muted); }
.desc .row { margin-top: 6px; }

.progress { height: 6px; background: var(--column); border-radius: 99px; overflow: hidden; margin-bottom: 8px; }
.progress span { display: block; height: 100%; background: var(--accent); }
.progress.full span { background: var(--ok); }
.check-item { display: flex; align-items: flex-start; gap: 8px; padding: 4px 6px; border-radius: 6px; }
.check-item:hover { background: var(--hover); }
.check-item span { flex: 1; overflow-wrap: anywhere; }
.check-item.done span { text-decoration: line-through; color: var(--muted); }
.check-item input { margin-top: 3px; accent-color: var(--accent); }
.checklist form { margin: 6px 0; }
.checklist form input { flex: 1; }

.chips { display: flex; flex-wrap: wrap; gap: 5px; align-items: center; }
.chip {
  display: inline-flex; align-items: center; gap: 5px; padding: 2px 4px 2px 3px; border-radius: 99px;
  background: var(--column); font-size: 15px;
}
.chip .label { cursor: default; }
.chips form { width: 100%; }
.chips form input { width: 100%; }

.comment-form { display: flex; flex-direction: column; gap: 6px; align-items: flex-end; }
.comment { margin-top: 12px; }
.comment-head { display: flex; align-items: center; gap: 7px; }
.comment-text { margin: 4px 0 0 33px; white-space: pre-wrap; overflow-wrap: anywhere; padding: 7px 10px; background: var(--hover); border-radius: 8px; }

/* ---------- list / overview ---------- */
.list-view, .activity-view { max-width: 1100px; margin: 0 auto; padding: 24px 16px; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-bottom: 18px; }
.stat { background: var(--surface); box-shadow: var(--shadow); border-radius: 12px; padding: 12px 14px; }
.stat b { display: block; font-size: 28px; line-height: 1.2; }
.stat.warn b { color: var(--danger); }
.workload { background: var(--surface); box-shadow: var(--shadow); border-radius: 12px; padding: 12px 14px; margin-bottom: 18px; }
.workload h3 { margin: 0 0 8px; font-size: 16px; }
.work-row { display: grid; grid-template-columns: 26px 130px 1fr 32px; gap: 8px; align-items: center; padding: 3px 0; }
.work-row .name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bar { height: 8px; background: var(--column); border-radius: 99px; overflow: hidden; }
.bar span { display: block; height: 100%; background: var(--accent); border-radius: 99px; }

.table-wrap { overflow-x: auto; background: var(--surface); box-shadow: var(--shadow); border-radius: 12px; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--border); vertical-align: middle; }
th { font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; white-space: nowrap; }
th button { border: none; background: none; padding: 0; color: inherit; font: inherit; text-transform: inherit; letter-spacing: inherit; }
tbody tr { cursor: pointer; }
tbody tr:hover { background: var(--hover); }
tbody tr:last-child td { border-bottom: none; }
td .labels { margin: 0; }

.activity-item { display: flex; gap: 10px; padding: 9px 0; border-bottom: 1px solid var(--border); align-items: flex-start; }
.activity-item p { margin: 0; flex: 1; overflow-wrap: anywhere; }

/* ---------- toast ---------- */
#toast {
  position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 20px); z-index: 60;
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 10px;
  opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; max-width: calc(100% - 32px);
}
#toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- small screens ---------- */
@media (max-width: 700px) {
  #topbar { padding: 8px 12px; gap: 8px; }
  .search { width: 100%; order: 10; flex: 1 1 100%; }
  .board-title { max-width: 55vw; }
  .me span:last-child { display: none; }
  .board { scroll-snap-type: x mandatory; padding: 12px; }
  .column, .add-column { width: 86vw; scroll-snap-align: center; }
  .overlay { padding: 0; }
  .dialog { border-radius: 0; min-height: 100%; padding: 14px 16px; }
  .dialog-body { grid-template-columns: 1fr; }
  .work-row { grid-template-columns: 26px 90px 1fr 32px; }
}