:root {
  --bg: #101820;
  --bg2: #17232d;
  --panel: rgba(248, 250, 252, .92);
  --panel-dark: rgba(15, 23, 42, .84);
  --ink: #0f172a;
  --paper: #f8fafc;
  --muted: #64748b;
  --line: rgba(148, 163, 184, .32);
  --primary: #1d4ed8;
  --accent: #0f766e;
  --danger: #b91c1c;
  --shadow: 0 24px 70px rgba(2, 6, 23, .24);
}

* { box-sizing: border-box; }
html { font-size: 17px; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--paper);
  background:
    linear-gradient(120deg, rgba(15, 118, 110, .18), transparent 32%),
    linear-gradient(160deg, var(--bg), var(--bg2) 58%, #0a0f15);
}
body[data-theme="cream"] {
  --bg: #f5edcf;
  --bg2: #fff8dc;
  --panel: rgba(255, 252, 234, .96);
  --panel-dark: rgba(255, 248, 220, .86);
  --ink: #2b2418;
  --paper: #fff8dc;
  --muted: #6c6048;
  --line: rgba(91, 70, 33, .18);
  --primary: #9a6100;
}
body[data-theme="dark"] {
  --bg: #07111f;
  --bg2: #111827;
  --panel: rgba(15, 23, 42, .92);
  --panel-dark: rgba(15, 23, 42, .84);
  --ink: #e5e7eb;
  --paper: #0f172a;
  --muted: #94a3b8;
  --line: rgba(226, 232, 240, .13);
  --primary: #60a5fa;
}

button, input, select, textarea, a {
  font: inherit;
}
a { color: inherit; text-decoration: none; }
button, select, input, textarea {
  border: 1px solid var(--line);
  border-radius: 12px;
}
button { cursor: pointer; }

.app-side-nav {
  position: fixed;
  left: max(8px, env(safe-area-inset-left));
  top: max(8px, env(safe-area-inset-top));
  bottom: max(8px, env(safe-area-inset-bottom));
  z-index: 40;
  width: 64px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--bg2);
  color: var(--paper);
  box-shadow: var(--shadow);
  transition: width .22s ease;
}
.app-side-nav:not(.collapsed) {
  width: min(280px, calc(100vw - 18px));
  box-shadow: 0 30px 90px rgba(2, 6, 23, .42);
}
.app-side-nav.collapsed .side-nav-content,
.app-side-nav.collapsed .side-nav-brand strong { opacity: 0; pointer-events: none; }
.side-nav-head {
  display: grid;
  gap: 10px;
  padding: 10px;
}
.side-nav-toggle {
  display: grid;
  gap: 5px;
  place-content: center;
  width: 40px;
  height: 40px;
  background: var(--bg);
}
.side-nav-toggle span {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: var(--paper);
  transition: transform .2s ease;
}
.app-side-nav.collapsed .side-nav-toggle span:first-child { transform: translateY(3.5px) rotate(35deg); }
.app-side-nav.collapsed .side-nav-toggle span:last-child { transform: translateY(-3.5px) rotate(-35deg); }
.side-nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  width: max-content;
  font-weight: 950;
}
.side-nav-brand span {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 12px;
  color: #fff;
  background: var(--primary);
}
.side-nav-brand strong {
  opacity: 1;
  transition: opacity .16s ease;
}
.side-nav-content {
  display: grid;
  gap: 12px;
  min-width: 252px;
  padding: 0 10px 12px;
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
  transition: opacity .16s ease, transform .2s ease;
}
.app-side-nav.collapsed .side-nav-content {
  opacity: 0;
  transform: translateX(-8px);
  pointer-events: none;
}
.side-nav-group {
  display: grid;
  gap: 6px;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 10px;
  background: var(--bg);
}
.side-nav-group span {
  color: var(--muted);
  font-size: .74rem;
  font-weight: 950;
  text-transform: uppercase;
}
.side-nav-group a,
.side-nav-group button {
  display: flex;
  align-items: center;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 11px;
  padding: 8px 10px;
  color: var(--paper);
  background: var(--bg2);
  font-weight: 950;
}
.side-nav-group .active {
  color: #fff;
  background: var(--primary);
  border-color: var(--primary);
}
.side-nav-group a[aria-current="page"],
.side-nav-group button[aria-current="page"] {
  box-shadow: inset 3px 0 0 var(--primary), 0 6px 14px rgba(37,99,235,.16);
}
.side-nav-controls {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.side-nav-controls span { grid-column: 1 / -1; }

.anki-shell {
  width: min(1440px, calc(100vw - 250px));
  margin: 0 20px 0 240px;
  padding: 18px 0 136px;
}
.anki-toolbar {
  display: grid;
  grid-template-columns: minmax(240px, .72fr) minmax(420px, 1.28fr);
  gap: 14px;
  align-items: end;
  margin-bottom: 14px;
  padding: 18px;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 18px;
  background: rgba(15, 23, 42, .74);
  box-shadow: var(--shadow);
}
.eyebrow {
  margin: 0 0 3px;
  color: #99f6e4;
  font-size: .74rem;
  font-weight: 950;
  text-transform: uppercase;
}
h1 { margin: 0; font-size: clamp(1.5rem, 2vw, 2.2rem); letter-spacing: 0; }
.anki-toolbar p:last-child { margin: 5px 0 0; color: #cbd5e1; font-weight: 800; }
.toolbar-grid {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) minmax(130px, .55fr) minmax(130px, .55fr) minmax(150px, .64fr);
  gap: 10px;
}
.toolbar-grid label {
  display: grid;
  gap: 5px;
  color: #cbd5e1;
  font-size: .72rem;
  font-weight: 950;
  text-transform: uppercase;
}
.toolbar-grid input,
.toolbar-grid select {
  width: 100%;
  min-height: 44px;
  padding: 8px 10px;
  color: #0f172a;
  background: rgba(255,255,255,.95);
  outline: none;
}

.focus-stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 250px;
  gap: 14px;
  align-items: stretch;
  padding-bottom: 28px;
}
.anki-card {
  min-height: min(690px, calc(100vh - 224px));
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  gap: 20px;
  padding: clamp(20px, 3vw, 44px);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 26px;
  background: var(--panel);
  color: var(--ink);
  box-shadow: var(--shadow);
  outline: none;
  transition: opacity .18s ease, transform .18s ease;
}
.anki-card.is-changing { opacity: .2; transform: translateY(8px); }
.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.badge {
  display: inline-flex;
  min-height: 29px;
  align-items: center;
  border: 1px solid rgba(15,23,42,.1);
  border-radius: 999px;
  padding: 4px 9px;
  color: #475569;
  background: #eef2ff;
  font-size: .74rem;
  font-weight: 950;
}
.badge.primary { color: #fff; background: var(--primary); }
.front {
  display: grid;
  place-items: center;
  text-align: center;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.45rem, 2.9vw, 3.6rem);
  line-height: 1.16;
  font-weight: 700;
}
.anki-key,
.anki-trial {
  color: var(--primary);
  font-weight: 950;
}
.anki-author {
  text-decoration-thickness: .11em;
  text-underline-offset: .18em;
  font-weight: 850;
}
.answer {
  border-top: 1px solid rgba(15,23,42,.12);
  padding-top: 18px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.04rem, .6vw + .96rem, 1.42rem);
  line-height: 1.52;
  overflow-x: auto;
}
.answer[hidden] { display: none; }
.answer table {
  width: 100%;
  border-collapse: collapse;
  font-size: .95em;
  margin: .7rem 0;
}
.answer th,
.answer td {
  border: 1px solid rgba(15,23,42,.16);
  padding: .45rem .55rem;
  vertical-align: top;
}
.answer th { background: rgba(29, 78, 216, .10); }
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}
.tags span {
  border: 1px solid rgba(15,23,42,.1);
  border-radius: 999px;
  padding: 3px 8px;
  color: #475569;
  background: #f8fafc;
  font-size: .72rem;
  font-weight: 850;
}
.card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  justify-content: center;
}
.card-actions button {
  min-height: 44px;
  padding: 9px 13px;
  color: var(--ink);
  background: #fff;
  font-weight: 950;
}
.card-actions .primary { color: #fff; background: var(--primary); border-color: var(--primary); }
.card-actions .danger { color: #fff; background: var(--danger); border-color: var(--danger); }

.side-panel {
  display: grid;
  align-content: start;
  gap: 12px;
}
.meter-block,
.key-list {
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 18px;
  padding: 14px;
  background: var(--panel-dark);
  box-shadow: var(--shadow);
}
.meter-block span {
  display: block;
  color: #cbd5e1;
  font-size: .75rem;
  font-weight: 950;
  text-transform: uppercase;
}
.meter-block strong {
  display: block;
  margin: 4px 0 10px;
  font-size: 1.5rem;
}
.meter {
  height: 9px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255,255,255,.14);
}
#positionBar {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: #99f6e4;
  transition: width .18s ease;
}
.key-list {
  display: grid;
  gap: 9px;
  color: #cbd5e1;
  font-size: .88rem;
  font-weight: 800;
}
kbd {
  display: inline-grid;
  place-items: center;
  min-width: 28px;
  min-height: 24px;
  margin-right: 4px;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 7px;
  color: #fff;
  background: rgba(255,255,255,.10);
  font-size: .75rem;
  font-weight: 950;
}

.edit-dialog {
  width: min(900px, calc(100vw - 28px));
  border: 0;
  padding: 0;
  background: transparent;
}
.edit-dialog::backdrop { background: rgba(2,6,23,.6); backdrop-filter: blur(6px); }
.edit-card {
  display: grid;
  gap: 12px;
  border-radius: 22px;
  padding: 18px;
  color: var(--ink);
  background: var(--paper);
  box-shadow: var(--shadow);
}
.edit-head,
.edit-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.edit-head h2 { margin: 0; }
.edit-head button,
.edit-actions button {
  min-height: 42px;
  padding: 8px 12px;
  background: #fff;
  font-weight: 950;
}
.edit-actions .primary { color: #fff; background: var(--primary); border-color: var(--primary); }
.edit-actions .danger { color: #fff; background: var(--danger); border-color: var(--danger); }
.edit-card label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 950;
  text-transform: uppercase;
}
.edit-card textarea,
.edit-card input {
  width: 100%;
  min-height: 44px;
  padding: 10px;
  color: var(--ink);
  background: #fff;
  outline: none;
}
.edit-card textarea {
  min-height: 150px;
  resize: vertical;
  font-family: Georgia, "Times New Roman", serif;
  text-transform: none;
}

.anki-action-dock {
  position: fixed;
  left: 50%;
  bottom: max(10px, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 28;
  display: flex;
  align-items: flex-end;
  gap: 9px;
  min-height: 70px;
  padding: 9px;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 18px;
  background: rgba(8, 13, 20, .82);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}
.anki-action-dock button {
  position: relative;
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 13px;
  background: rgba(255,255,255,.08);
  color: #fff;
  font-weight: 950;
  transition: width .18s ease, height .18s ease, transform .18s ease, background .18s ease;
}
.anki-action-dock button:hover,
.anki-action-dock button:focus-visible,
.anki-action-dock button.active {
  width: 66px;
  height: 66px;
  background: var(--primary);
  transform: translateY(-7px);
}
.anki-action-dock em {
  position: absolute;
  top: -30px;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  opacity: 0;
  pointer-events: none;
  white-space: nowrap;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 8px;
  padding: 3px 8px;
  background: rgba(8,13,20,.92);
  font-size: .72rem;
  font-style: normal;
  transition: opacity .16s ease, transform .16s ease;
}
.anki-action-dock button:hover em,
.anki-action-dock button:focus-visible em { opacity: 1; transform: translateX(-50%) translateY(0); }

.toast {
  position: fixed;
  left: 50%;
  bottom: 92px;
  transform: translateX(-50%) translateY(40px);
  opacity: 0;
  z-index: 80;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 999px;
  padding: 11px 15px;
  color: #fff;
  background: rgba(8,13,20,.92);
  box-shadow: var(--shadow);
  font-weight: 850;
  transition: opacity .18s ease, transform .18s ease;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 980px) {
  .anki-toolbar,
  .focus-stage {
    grid-template-columns: 1fr;
  }
  .toolbar-grid {
    grid-template-columns: 1fr 1fr;
  }
  .side-panel {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 700px) {
  .app-side-nav {
    width: 60px;
    bottom: max(8px, env(safe-area-inset-bottom));
    border-radius: 18px;
  }
  .app-side-nav:not(.collapsed) {
    width: min(330px, calc(100vw - 18px));
    max-height: calc(100dvh - max(18px, env(safe-area-inset-top)) - max(18px, env(safe-area-inset-bottom)));
    overflow-y: auto;
    box-shadow: 0 30px 90px rgba(2, 6, 23, .42);
  }
  .app-side-nav.collapsed .side-nav-content,
  .app-side-nav.collapsed .side-nav-brand strong {
    display: none;
  }
  .app-side-nav.collapsed .side-nav-head {
    padding: 8px;
  }
  .app-side-nav.collapsed .side-nav-brand {
    width: 40px;
    overflow: hidden;
  }
  .side-panel {
    display: none;
  }
  .anki-toolbar {
    padding: 12px;
    margin-bottom: 10px;
  }
  .toolbar-grid {
    grid-template-columns: 1fr 1fr;
    overflow: visible;
    padding-bottom: 0;
  }
  .toolbar-grid label {
    min-width: 0;
  }
  .anki-shell {
    width: calc(100vw - 16px);
    margin: 0 8px;
    padding-top: calc(max(8px, env(safe-area-inset-top)) + 132px);
    padding-bottom: 110px;
  }
  .anki-toolbar h1 {
    font-size: clamp(1.45rem, 8vw, 2rem);
  }
  .toolbar-grid input,
  .toolbar-grid select {
    min-height: 42px;
  }
  .anki-card {
    min-height: clamp(430px, calc(100dvh - 330px), 620px);
    border-radius: 18px;
    padding: clamp(18px, 5vw, 28px);
    touch-action: pan-y;
  }
  .front {
    font-size: clamp(1.65rem, 9vw, 2.55rem);
    line-height: 1.13;
  }
  .answer {
    font-size: clamp(1.04rem, 4.4vw, 1.28rem);
    line-height: 1.46;
  }
  .card-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .card-actions button {
    min-width: 0;
    padding-inline: 8px;
  }
  .answer table {
    min-width: 520px;
  }
  .anki-action-dock {
    max-width: calc(100vw - 10px);
    overflow-x: auto;
  }
}