/* Layout: one-screen phone app — top bar, scrolling view, thumb-zone tab bar.
   The flashcard is drawn as a Delft tile: porcelain ground, cobalt ink, corner motifs. */
:root {
  --bg: #eef1f7;          /* porcelain, blue-biased */
  --surface: #ffffff;
  --sunk: #e3e8f2;
  --fg: #141c33;
  --muted: #5a6582;
  --line: #d3daea;
  --delft: #1d3e8a;       /* cobalt glaze — primary */
  --delft-soft: #dfe7fb;
  --tulip: #d9482b;       /* accent: streaks, "new" */
  --tulip-soft: #fbe3dc;
  --again: #b8322a;
  --hard: #a86a12;
  --good: #23784a;
  --easy: #1d3e8a;
  --de: #1d6f8a;
  --het: #8a3a7a;
  --shadow: 0 1px 2px rgb(20 28 51 / .06), 0 8px 24px -12px rgb(20 28 51 / .18);

  --font-display: "Bricolage Grotesque", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --font-body: "Atkinson Hyperlegible", "Segoe UI", system-ui, -apple-system, sans-serif;

  --t-xs: .78rem; --t-sm: .9rem; --t-md: 1rem; --t-lg: 1.25rem; --t-xl: 1.7rem; --t-2xl: 2.4rem; --t-3xl: 3.1rem;
  --r: 14px;
  --tabbar-h: 64px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1322; --surface: #161f35; --sunk: #1d2842; --fg: #e9edf7; --muted: #9ba6c2; --line: #2a3654;
    --delft: #93b1ff; --delft-soft: #22325c; --tulip: #ff7f5e; --tulip-soft: #45231c;
    --again: #ff7b70; --hard: #f0b44c; --good: #62d293; --easy: #93b1ff; --de: #6cc9e6; --het: #e199d4;
    --shadow: 0 1px 2px rgb(0 0 0 / .3), 0 10px 30px -14px rgb(0 0 0 / .6);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0d1322; --surface: #161f35; --sunk: #1d2842; --fg: #e9edf7; --muted: #9ba6c2; --line: #2a3654;
  --delft: #93b1ff; --delft-soft: #22325c; --tulip: #ff7f5e; --tulip-soft: #45231c;
  --again: #ff7b70; --hard: #f0b44c; --good: #62d293; --easy: #93b1ff; --de: #6cc9e6; --het: #e199d4;
  --shadow: 0 1px 2px rgb(0 0 0 / .3), 0 10px 30px -14px rgb(0 0 0 / .6);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 400 var(--t-md)/1.5 var(--font-body);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}
body::before {
  content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 10; background: var(--bg);
}
h1, h2, h3 { font-family: var(--font-display); text-wrap: balance; margin: 0; line-height: 1.15; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--delft); }
:focus-visible { outline: 2px solid var(--delft); outline-offset: 2px; border-radius: 6px; }
.num { font-variant-numeric: tabular-nums; }

.app {
  display: flex; flex-direction: column; min-height: 100%;
  max-width: 560px; margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}

/* ── top bar ── */
.topbar {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5;
  display: flex; align-items: center; justify-content: space-between;
  padding-block: 14px 10px; background: var(--bg);
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-tile {
  width: 26px; height: 26px; border-radius: 6px; background: var(--delft);
  box-shadow: inset 0 0 0 3px var(--bg), inset 0 0 0 4.5px var(--delft);
  position: relative;
}
.brand-tile::after {
  content: ""; position: absolute; inset: 9px; border-radius: 50%; background: var(--bg);
}
.brand-name { font: 800 var(--t-lg)/1 var(--font-display); letter-spacing: -.01em; }
.streak {
  font-size: var(--t-sm); font-weight: 700; color: var(--tulip);
  background: var(--tulip-soft); padding: 4px 10px; border-radius: 999px;
}

.view { flex: 1; padding-block: 4px calc(var(--tabbar-h) + 28px + env(safe-area-inset-bottom, 0px)); outline: none; }
.view > * + * { margin-top: 18px; }
.loading { color: var(--muted); text-align: center; padding-top: 30vh; }

/* ── tab bar ── */
.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 6;
  display: flex; justify-content: center; gap: 4px;
  padding: 6px max(16px, env(safe-area-inset-right, 0px)) calc(6px + env(safe-area-inset-bottom, 0px)) max(16px, env(safe-area-inset-left, 0px));
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
}
.tab {
  flex: 1; max-width: 140px; display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 6px 0; text-decoration: none; color: var(--muted); font-size: var(--t-xs); font-weight: 700;
  border-radius: 10px;
}
.tab svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.tab[aria-current="page"] { color: var(--delft); }
.studying .tabbar { display: none; }
.studying .view { padding-bottom: calc(24px + env(safe-area-inset-bottom, 0px)); }

/* ── buttons ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 0 20px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--surface); font-weight: 700; cursor: pointer; text-decoration: none; color: var(--fg);
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--delft); border-color: var(--delft); color: var(--surface); }
.btn-block { width: 100%; }
.btn-ghost { background: transparent; border-color: transparent; color: var(--delft); }
.btn-small { min-height: 36px; padding: 0 12px; font-size: var(--t-sm); border-radius: 10px; }
.btn-danger { color: var(--again); }
.btn[disabled] { opacity: .5; cursor: default; }
.icon-btn {
  width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--line); background: var(--surface);
  display: inline-grid; place-items: center; cursor: pointer; color: var(--delft); flex: none;
}
.icon-btn svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* ── home ── */
.today-date { color: var(--muted); font-size: var(--t-sm); text-transform: capitalize; }
.today {
  background: var(--surface); border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow);
  padding: 22px 20px 20px; display: grid; gap: 18px;
}
.today h1 { font-size: var(--t-xl); font-weight: 800; letter-spacing: -.015em; }
.today-counts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.count { display: grid; gap: 2px; }
.count b { font: 800 var(--t-2xl)/1 var(--font-display); font-variant-numeric: tabular-nums; }
.count span { font-size: var(--t-xs); color: var(--muted); font-weight: 700; text-transform: uppercase; letter-spacing: .06em; }
.count.due b { color: var(--delft); }
.count.new b { color: var(--tulip); }
.today-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.today-actions .btn-primary { flex: 1; }

.banner {
  display: flex; gap: 12px; align-items: flex-start;
  background: var(--tulip-soft); color: var(--fg); border-radius: var(--r); padding: 14px 16px;
}
.banner b { color: var(--tulip); }
.banner p { margin: 0; }
.banner .btn { margin-left: auto; flex: none; }

.section-title { font-size: var(--t-xs); text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 700; margin: 0 0 8px; }
.progress { display: grid; gap: 10px; }
.bar { display: flex; height: 12px; border-radius: 999px; overflow: hidden; background: var(--sunk); }
.bar i { display: block; height: 100%; }
.bar .k { background: var(--good); }
.bar .l { background: var(--delft); }
.bar .n { background: transparent; }
.legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: var(--t-sm); color: var(--muted); }
.legend span::before { content: ""; display: inline-block; width: 9px; height: 9px; border-radius: 3px; margin-right: 6px; vertical-align: 0; }
.legend .k::before { background: var(--good); }
.legend .l::before { background: var(--delft); }
.legend .n::before { background: var(--sunk); box-shadow: inset 0 0 0 1px var(--line); }
.legend b { color: var(--fg); }

.lessons { list-style: none; padding: 0; margin: 0; display: grid; }
.lessons li { display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; padding: 12px 0; border-top: 1px solid var(--line); }
.lessons li:first-child { border-top: 0; }
.lessons .lname { font-weight: 700; }
.lessons .lmeta { color: var(--muted); font-size: var(--t-sm); text-align: right; }
.lessons .bar { grid-column: 1 / -1; height: 6px; }

.howto { color: var(--muted); font-size: var(--t-sm); }
.howto summary { cursor: pointer; font-weight: 700; color: var(--fg); }
.howto p { margin: 8px 0 0; max-width: 62ch; }

/* ── study ── */
.study { display: flex; flex-direction: column; gap: 16px; min-height: calc(100dvh - 120px - env(safe-area-inset-top, 0px) - env(safe-area-inset-bottom, 0px)); }
.study-head { display: flex; align-items: center; gap: 12px; }
.study-head .meter { flex: 1; height: 6px; border-radius: 999px; background: var(--sunk); overflow: hidden; }
.study-head .meter i { display: block; height: 100%; background: var(--delft); transition: width .25s ease; }
.study-head .left { font-size: var(--t-sm); color: var(--muted); font-weight: 700; }

.tile {
  --c: var(--delft);
  position: relative; flex: 1; min-height: 300px;
  display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; gap: 12px;
  padding: 40px 26px; border-radius: 18px; background: var(--surface);
  border: 1px solid var(--line); box-shadow: var(--shadow); cursor: pointer; user-select: none;
  /* Delft-tile corner motifs */
  background-image:
    radial-gradient(circle at 0 0, transparent 13px, var(--c) 13.5px 15px, transparent 15.5px),
    radial-gradient(circle at 100% 0, transparent 13px, var(--c) 13.5px 15px, transparent 15.5px),
    radial-gradient(circle at 0 100%, transparent 13px, var(--c) 13.5px 15px, transparent 15.5px),
    radial-gradient(circle at 100% 100%, transparent 13px, var(--c) 13.5px 15px, transparent 15.5px);
  background-size: 34px 34px; background-repeat: no-repeat;
  background-position: 8px 8px, calc(100% - 8px) 8px, 8px calc(100% - 8px), calc(100% - 8px) calc(100% - 8px);
}
.tile::before {
  content: ""; position: absolute; inset: 10px; border-radius: 12px; pointer-events: none;
  border: 1.5px solid color-mix(in srgb, var(--c) 28%, transparent);
}
.tile .mode {
  position: absolute; top: 18px; left: 50%; transform: translateX(-50%);
  font-size: var(--t-xs); text-transform: uppercase; letter-spacing: .1em; font-weight: 700; color: var(--muted);
  white-space: nowrap;
}
.tile .prompt { font: 700 var(--t-xl)/1.2 var(--font-display); max-width: 22ch; overflow-wrap: anywhere; }
.tile .dutch { font: 800 var(--t-3xl)/1.05 var(--font-display); color: var(--delft); letter-spacing: -.02em; overflow-wrap: anywhere; max-width: 100%; }
.tile .dutch.long { font-size: var(--t-2xl); }
.tile .en-small { color: var(--muted); font-size: var(--t-lg); }
.tile .hint { font-size: var(--t-md); color: var(--muted); }
.tile .hint::before { content: "say "; font-size: var(--t-xs); text-transform: uppercase; letter-spacing: .08em; }
.tile .tap { color: var(--muted); font-size: var(--t-sm); position: absolute; bottom: 20px; }
.tile .divider { width: 40px; height: 2px; background: var(--line); border-radius: 2px; }
.tile.revealed { cursor: default; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; }
.chip {
  font-size: var(--t-xs); font-weight: 700; padding: 3px 10px; border-radius: 999px;
  background: var(--sunk); color: var(--muted); letter-spacing: .02em;
}
.chip.de { background: color-mix(in srgb, var(--de) 16%, transparent); color: var(--de); }
.chip.het { background: color-mix(in srgb, var(--het) 16%, transparent); color: var(--het); }
.chip.new { background: var(--tulip-soft); color: var(--tulip); }
.chip.leech { background: color-mix(in srgb, var(--again) 14%, transparent); color: var(--again); }
.mnemonic { font-style: italic; color: var(--fg); max-width: 34ch; }

.listen-btn {
  width: 96px; height: 96px; border-radius: 50%; border: 0; background: var(--delft-soft); color: var(--delft);
  display: grid; place-items: center; cursor: pointer;
}
.listen-btn svg { width: 44px; height: 44px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.answer-form { display: flex; gap: 8px; width: 100%; max-width: 380px; }
.answer-form input {
  flex: 1; min-width: 0; min-height: 52px; padding: 0 14px; border-radius: 12px;
  border: 1.5px solid var(--line); background: var(--bg); font-size: 1.15rem;
}
.answer-form input:focus { border-color: var(--delft); outline: none; }
.feedback { font-weight: 700; max-width: 32ch; }
.feedback.correct { color: var(--good); }
.feedback.article, .feedback.almost { color: var(--hard); }
.feedback.wrong, .feedback.empty { color: var(--again); }
.your { color: var(--muted); font-size: var(--t-sm); text-decoration: line-through; }

.grades { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.grade {
  min-height: 62px; border-radius: 12px; border: 1.5px solid var(--line); background: var(--surface); cursor: pointer;
  display: grid; place-content: center; gap: 1px; font-weight: 700; color: var(--g);
}
.grade small { font-weight: 400; color: var(--muted); font-size: var(--t-xs); font-variant-numeric: tabular-nums; }
.grade[data-g="again"] { --g: var(--again); }
.grade[data-g="hard"] { --g: var(--hard); }
.grade[data-g="good"] { --g: var(--good); }
.grade[data-g="easy"] { --g: var(--easy); }
.grade.suggested { border-color: var(--g); background: color-mix(in srgb, var(--g) 10%, var(--surface)); }
.reveal-row { display: flex; gap: 8px; }
.reveal-row .btn-primary { flex: 1; min-height: 62px; font-size: var(--t-lg); }

.done { text-align: center; display: grid; gap: 14px; justify-items: center; padding-top: 12vh; }
.done h1 { font-size: var(--t-2xl); font-weight: 800; }
.done p { color: var(--muted); margin: 0; max-width: 34ch; }

/* ── words ── */
.search { position: sticky; top: calc(env(safe-area-inset-top, 0px) + 50px); z-index: 4; background: var(--bg); padding-block: 4px 8px; display: grid; gap: 10px; }
.search input {
  width: 100%; min-height: 46px; padding: 0 14px; border-radius: 12px; border: 1px solid var(--line); background: var(--surface);
}
.filters { display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none; }
.filters button {
  flex: none; border: 1px solid var(--line); background: var(--surface); border-radius: 999px; padding: 6px 12px;
  font-size: var(--t-sm); font-weight: 700; color: var(--muted); cursor: pointer;
}
.filters button[aria-pressed="true"] { background: var(--delft); border-color: var(--delft); color: var(--surface); }
.wordlist { list-style: none; margin: 0; padding: 0; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; }
.wordlist > li + li { border-top: 1px solid var(--line); }
.wrow { width: 100%; display: grid; grid-template-columns: 1fr auto; gap: 2px 12px; text-align: left; padding: 12px 14px; background: none; border: 0; cursor: pointer; }
.wrow .w-nl { font-weight: 700; min-width: 0; overflow-wrap: anywhere; }
.wrow .w-en { color: var(--muted); font-size: var(--t-sm); grid-column: 1; min-width: 0; overflow-wrap: anywhere; }
.wrow .w-state { grid-row: 1 / span 2; grid-column: 2; align-self: center; }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; background: var(--sunk); box-shadow: inset 0 0 0 1px var(--line); }
.dot.learning { background: var(--delft); box-shadow: none; }
.dot.known { background: var(--good); box-shadow: none; }
.wdetail { padding: 0 14px 14px; display: grid; gap: 10px; }
.wdetail .row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.wdetail .meta { color: var(--muted); font-size: var(--t-sm); }
.wdetail textarea, .field textarea {
  width: 100%; min-height: 70px; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); resize: vertical;
}
.empty-note { color: var(--muted); text-align: center; padding: 24px 0; }

/* ── settings ── */
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 4px 16px; }
.field { display: grid; gap: 8px; padding: 14px 0; }
.field + .field { border-top: 1px solid var(--line); }
.field label, .field .label { font-weight: 700; }
.field .help { color: var(--muted); font-size: var(--t-sm); margin: 0; }
.field-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.field select { min-height: 44px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); padding: 0 10px; max-width: 100%; }
.field input[type="range"] { width: 100%; accent-color: var(--delft); }
.seg { display: grid; grid-template-columns: repeat(4, 1fr); background: var(--sunk); border-radius: 12px; padding: 3px; gap: 3px; }
.seg button { border: 0; background: transparent; border-radius: 9px; min-height: 40px; font-weight: 700; font-size: var(--t-sm); color: var(--muted); cursor: pointer; }
.seg button[aria-pressed="true"] { background: var(--surface); color: var(--delft); box-shadow: var(--shadow); }
.switch { position: relative; width: 50px; height: 30px; flex: none; }
.switch input { position: absolute; inset: 0; opacity: 0; margin: 0; cursor: pointer; }
.switch span { position: absolute; inset: 0; border-radius: 999px; background: var(--sunk); box-shadow: inset 0 0 0 1px var(--line); transition: background .15s; pointer-events: none; }
.switch span::after { content: ""; position: absolute; top: 3px; left: 3px; width: 24px; height: 24px; border-radius: 50%; background: var(--surface); box-shadow: 0 1px 3px rgb(0 0 0 / .25); transition: transform .15s; }
.switch input:checked + span { background: var(--delft); }
.switch input:checked + span::after { transform: translateX(20px); }
.switch input:focus-visible + span { outline: 2px solid var(--delft); outline-offset: 2px; }
.btns { display: flex; gap: 8px; flex-wrap: wrap; }
.warn { color: var(--hard); font-size: var(--t-sm); margin: 0; }
.foot { color: var(--muted); font-size: var(--t-xs); text-align: center; }

.toast {
  position: fixed; left: 50%; transform: translateX(-50%);
  bottom: calc(var(--tabbar-h) + 18px + env(safe-area-inset-bottom, 0px)); z-index: 20;
  background: var(--fg); color: var(--bg); padding: 10px 16px; border-radius: 999px; font-weight: 700; font-size: var(--t-sm);
  max-width: calc(100% - 32px); text-align: center;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}
@media (min-width: 700px) {
  .tile { min-height: 360px; }
}

/* two lists */
.count.remind b { color: var(--good); }
.bar .s { background: var(--tulip); }
.legend .s::before { background: var(--tulip); }

/* exam tips */
.tips-intro { color: var(--muted); margin: 6px 0 0; max-width: 62ch; }
.exams { display: grid; gap: 10px; }
.exam { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); }
.exam summary {
  list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 14px 16px; min-height: 56px;
}
.exam summary::-webkit-details-marker { display: none; }
.exam summary::after {
  content: ""; width: 9px; height: 9px; flex: none; margin-left: 4px;
  border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted); transform: rotate(45deg) translateY(-3px);
  transition: transform .15s;
}
.exam[open] summary::after { transform: rotate(225deg) translateY(-2px); }
.exam-name { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; min-width: 0; }
.exam-nl { font: 700 var(--t-lg)/1.2 var(--font-display); }
.exam-en { color: var(--muted); font-size: var(--t-sm); }
.exam-count { margin-left: auto; font-size: var(--t-xs); font-weight: 700; color: var(--delft); background: var(--delft-soft); padding: 3px 10px; border-radius: 999px; white-space: nowrap; }
.exam-count.none { color: var(--muted); background: var(--sunk); }
.exam-intro { margin: 0 16px 8px; color: var(--muted); max-width: 62ch; }
.tiplist { margin: 0; padding: 0 16px 16px 16px; display: grid; gap: 14px; max-width: 66ch; }
ul.tiplist { list-style: none; }
ol.tiplist { padding-left: 36px; }
ol.tiplist li::marker { font: 700 var(--t-md) var(--font-display); color: var(--delft); }
ul.tiplist li { position: relative; padding-left: 18px; }
ul.tiplist li::before { content: ""; position: absolute; left: 0; top: .55em; width: 8px; height: 8px; border-radius: 2px; background: var(--delft); transform: rotate(45deg); }
.tiplist b { display: block; }
.tiplist p { margin: 4px 0 0; color: var(--muted); }
.exam .empty-note { margin: 0 16px 14px; }
.tip-group { margin: 4px 16px 10px; font: 700 var(--t-xs)/1.2 var(--font-body); text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.tip-example { font-style: italic; color: var(--fg) !important; border-left: 3px solid var(--delft-soft); padding-left: 10px; }
.seg.seg-2 { grid-template-columns: repeat(2, 1fr); }

/* first run: whose lists */
.choose { background: var(--surface); border: 2px solid var(--delft); border-radius: 20px; padding: 18px; display: grid; gap: 10px; }
.choose h2 { font-size: var(--t-lg); }
.choose p { margin: 0; color: var(--muted); }
.choose-btns { display: grid; gap: 10px; }
.choose-btns .btn { flex-direction: column; align-items: flex-start; text-align: left; gap: 2px; padding: 12px 16px; min-height: 64px; }
.choose-btns .btn span { font-weight: 400; color: var(--muted); font-size: var(--t-sm); }