/* LexiQ v2 — fancy edition.
   Brand: ice blue #A9CCE3, slate #5B7FA6, mint #7FC4B2,
   dusty rose #D9A0AC, cool berry #8E3A5C, ink #22333B on canvas #FDFEFE */

:root {
  --ice: #A9CCE3;
  --slate: #5B7FA6;
  --mint: #7FC4B2;
  --rose: #D9A0AC;
  --berry: #8E3A5C;
  --ink: #22333B;
  --ink-soft: #55676f;
  --canvas: #FDFEFE;
  --line: #e2ebf2;
  --danger: #b3404f;
  --radius: 18px;
  --shadow-sm: 0 2px 10px rgba(91, 127, 166, 0.10);
  --shadow-md: 0 10px 30px rgba(91, 127, 166, 0.16);
  --shadow-lg: 0 18px 50px rgba(91, 127, 166, 0.22);
  --glass: rgba(253, 254, 254, 0.78);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: var(--canvas);
  -webkit-font-smoothing: antialiased;
  padding-bottom: 110px;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ---------- aurora background ---------- */
body::before, body::after {
  content: "";
  position: fixed;
  inset: -20vmax;
  z-index: -1;
  pointer-events: none;
}
body::before {
  background:
    radial-gradient(38vmax 38vmax at 12% 8%, rgba(169, 204, 227, 0.55), transparent 70%),
    radial-gradient(34vmax 34vmax at 88% 22%, rgba(127, 196, 178, 0.42), transparent 70%),
    radial-gradient(40vmax 40vmax at 55% 95%, rgba(217, 160, 172, 0.38), transparent 70%);
  animation: aurora-drift 26s ease-in-out infinite alternate;
}
body::after {
  background:
    radial-gradient(26vmax 26vmax at 78% 72%, rgba(169, 204, 227, 0.35), transparent 70%),
    radial-gradient(22vmax 22vmax at 20% 62%, rgba(127, 196, 178, 0.28), transparent 70%);
  animation: aurora-drift 34s ease-in-out infinite alternate-reverse;
}
@keyframes aurora-drift {
  from { transform: translate3d(-3vmax, -2vmax, 0) scale(1); }
  to   { transform: translate3d(3vmax, 2vmax, 0) scale(1.06); }
}

h1, h2, h3 { font-family: 'Sora', 'Inter', sans-serif; letter-spacing: -0.02em; }
h1 { font-size: 1.7rem; margin: 0.4rem 0 1rem; font-weight: 800; }
h2 { font-size: 1.25rem; margin: 1.2rem 0 0.6rem; font-weight: 700; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: var(--glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(226, 235, 242, 0.8);
}
.topbar-inner {
  max-width: 680px; margin: 0 auto; padding: 0.85rem 1.1rem 0.7rem;
  display: flex; align-items: baseline; gap: 0.75rem;
}
.logo {
  font-family: 'Sora', sans-serif; font-weight: 800; font-size: 1.45rem;
  background: linear-gradient(100deg, var(--slate), var(--berry));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.logo-dot {
  display: inline-block; width: 11px; height: 11px; border-radius: 50%;
  background: var(--berry); margin-right: 7px;
  -webkit-text-fill-color: var(--berry);
  box-shadow: 0 0 0 4px rgba(142, 58, 92, 0.14);
}
.tagline { font-size: 0.78rem; color: var(--ink-soft); font-weight: 500; }
.signal-line {
  height: 3px;
  background: linear-gradient(90deg, var(--ice), var(--mint) 45%, var(--rose) 75%, var(--berry));
  opacity: 0.85;
}

/* ---------- layout ---------- */
.container { max-width: 680px; margin: 0 auto; padding: 1.1rem 1.1rem 2rem; }
.view:not([hidden]) { animation: view-in 0.28s ease both; }
@keyframes view-in {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: none; }
}
.view-head { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; }
.view-head h1, .view-head h2 { margin: 0.4rem 0; }

.hint { font-size: 0.87rem; color: var(--ink-soft); line-height: 1.55; }
.hint code { background: rgba(169, 204, 227, 0.25); padding: 0.12rem 0.4rem; border-radius: 7px; font-size: 0.8rem; }

/* ---------- hero ---------- */
.hero {
  border-radius: 24px;
  padding: 1.6rem 1.4rem 1.4rem;
  margin: 0.2rem 0 1.1rem;
  background: linear-gradient(135deg, rgba(169, 204, 227, 0.5), rgba(127, 196, 178, 0.35) 55%, rgba(217, 160, 172, 0.35));
  border: 1px solid rgba(255, 255, 255, 0.7);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute; inset: 0;
  background-image: radial-gradient(rgba(91, 127, 166, 0.22) 1px, transparent 1px);
  background-size: 18px 18px;
  -webkit-mask-image: linear-gradient(115deg, transparent 55%, black);
  mask-image: linear-gradient(115deg, transparent 55%, black);
  pointer-events: none;
}
.hero-greeting { font-size: 0.85rem; font-weight: 600; color: var(--ink-soft); }
.hero h1 { margin: 0.15rem 0 1rem; font-size: 1.9rem; }
.hero-stats { display: flex; gap: 0.7rem; position: relative; z-index: 1; }
.stat {
  flex: 1;
  background: var(--glass);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 16px;
  padding: 0.7rem 0.4rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.stat strong { display: block; font-family: 'Sora', sans-serif; font-size: 1.5rem; font-weight: 800; color: var(--ink); }
.stat span { font-size: 0.7rem; font-weight: 600; color: var(--ink-soft); text-transform: uppercase; letter-spacing: 0.04em; }

/* ---------- data warning ---------- */
.data-warning {
  display: flex; gap: 0.75rem; align-items: flex-start;
  background: linear-gradient(120deg, rgba(217, 160, 172, 0.28), rgba(142, 58, 92, 0.12));
  border: 1px solid rgba(142, 58, 92, 0.28);
  border-radius: var(--radius);
  padding: 0.85rem 0.9rem;
  margin: 0 0 1.1rem;
  font-size: 0.85rem; line-height: 1.5; color: var(--ink);
  box-shadow: var(--shadow-sm);
}
.data-warning[hidden] { display: none; }
.data-warning.static { margin-top: 0.75rem; }
.dw-icon { font-size: 1.25rem; line-height: 1.3; }
.dw-text { flex: 1; }
.dw-close {
  border: none; background: none; cursor: pointer;
  font-size: 1.3rem; line-height: 1; color: var(--ink-soft); padding: 0.1rem 0.25rem;
}

/* ---------- buttons ---------- */
.btn {
  font-family: 'Inter', sans-serif; font-weight: 600; font-size: 0.9rem;
  border: 1px solid var(--line); background: var(--glass);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
  color: var(--ink);
  padding: 0.7rem 1.05rem; border-radius: 14px; cursor: pointer;
  display: inline-block; text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform 0.12s ease, box-shadow 0.15s ease;
}
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: linear-gradient(120deg, var(--slate), #476b8f);
  border: none; color: #fff;
  box-shadow: 0 8px 20px rgba(91, 127, 166, 0.35);
}
.btn-primary:active { box-shadow: 0 4px 12px rgba(91, 127, 166, 0.3); }
.btn-primary:disabled { opacity: 0.45; cursor: default; box-shadow: none; }
.btn-ghost { border-color: transparent; background: transparent; color: var(--slate); padding-left: 0; box-shadow: none; -webkit-backdrop-filter: none; backdrop-filter: none; }
.btn.back { margin-bottom: 0.25rem; }

.row { display: flex; gap: 0.6rem; flex-wrap: wrap; }

.linklike {
  background: none; border: none; padding: 0; cursor: pointer;
  color: var(--slate); font-size: 0.85rem; font-weight: 700;
}
.linklike.danger { color: var(--danger); }
.sep { color: var(--line); }

/* ---------- deck list ---------- */
.deck-list { display: grid; gap: 0.85rem; margin: 1rem 0; }
.deck-card {
  border: 1px solid rgba(255, 255, 255, 0.85);
  border-radius: 20px;
  padding: 1.05rem 1.1rem;
  background: var(--glass);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  display: flex; align-items: center; gap: 0.95rem;
  transition: transform 0.15s ease, box-shadow 0.2s ease;
  position: relative; overflow: hidden;
}
.deck-card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 6px;
  background: var(--accent, var(--ice));
}
.deck-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.deck-card:active { transform: scale(0.99); }
.deck-card.accent-0 { --accent: var(--ice); }
.deck-card.accent-1 { --accent: var(--mint); }
.deck-card.accent-2 { --accent: var(--rose); }
.deck-card.accent-3 { --accent: var(--berry); }
.deck-info { flex: 1; min-width: 0; }
.deck-card h3 { margin: 0 0 0.35rem; font-size: 1.08rem; font-weight: 700; }
.deck-meta { font-size: 0.83rem; color: var(--ink-soft); display: flex; gap: 0.8rem; align-items: center; flex-wrap: wrap; }
.due-pill {
  background: linear-gradient(120deg, var(--mint), #93d3c1);
  color: var(--ink); font-weight: 700;
  border-radius: 999px; padding: 0.14rem 0.65rem; font-size: 0.78rem;
  box-shadow: 0 2px 8px rgba(127, 196, 178, 0.4);
}
.due-pill.zero { background: rgba(169, 204, 227, 0.25); color: var(--ink-soft); font-weight: 600; box-shadow: none; }
.starter-badge {
  font-size: 0.7rem; font-weight: 700; color: var(--berry); text-transform: uppercase; letter-spacing: 0.05em;
  background: rgba(142, 58, 92, 0.1); border-radius: 999px; padding: 0.14rem 0.55rem;
  vertical-align: 2px; margin-left: 0.35rem;
}
.deck-ring { flex-shrink: 0; width: 56px; height: 56px; }
.deck-ring .ring-bg { fill: none; stroke: rgba(91, 127, 166, 0.15); stroke-width: 6; }
.deck-ring .ring-fg { fill: none; stroke: var(--accent, var(--ice)); stroke-width: 6; stroke-linecap: round; transition: stroke-dashoffset 0.6s ease; }
.deck-ring text { font-family: 'Sora', sans-serif; font-size: 13px; font-weight: 700; fill: var(--ink); }
.deck-arrow { font-size: 1.4rem; color: var(--slate); font-weight: 300; flex-shrink: 0; }

.empty {
  text-align: center; color: var(--ink-soft); padding: 3rem 1rem;
  background: var(--glass); border-radius: 20px; border: 1px dashed var(--line);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
}
.empty p { margin: 0.4rem 0 1rem; }

/* ---------- deck detail ---------- */
.deck-actions { display: flex; gap: 0.6rem; flex-wrap: wrap; margin: 0.6rem 0; }
.deck-meta-actions { margin: 0.25rem 0 1rem; }

.card-list { display: grid; gap: 0.65rem; margin-top: 0.5rem; }
.flash-row {
  border: 1px solid rgba(255, 255, 255, 0.85); border-radius: 16px;
  padding: 0.85rem 1rem; background: var(--glass);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  display: flex; align-items: center; gap: 0.6rem;
  box-shadow: var(--shadow-sm);
}
.flash-row .texts { flex: 1; min-width: 0; }
.flash-row .front { font-weight: 600; font-size: 0.95rem; }
.flash-row .back { font-size: 0.85rem; color: var(--ink-soft); margin-top: 0.1rem; }
.flash-row .note { font-size: 0.75rem; color: var(--slate); margin-top: 0.2rem; font-style: italic; }
.icon-btn {
  border: 1px solid var(--line); background: rgba(255, 255, 255, 0.9); border-radius: 12px;
  width: 40px; height: 40px; font-size: 1.05rem; cursor: pointer; flex-shrink: 0;
  box-shadow: var(--shadow-sm);
  transition: transform 0.12s ease;
}
.icon-btn:active { transform: scale(0.92); }

/* ---------- study ---------- */
.study-progress { font-size: 0.85rem; font-weight: 600; color: var(--ink-soft); margin: 0.5rem 0 0.4rem; }
.study-bar {
  height: 8px; border-radius: 999px; background: rgba(91, 127, 166, 0.15);
  overflow: hidden; margin-bottom: 0.9rem;
}
.study-bar-fill {
  height: 100%; border-radius: 999px;
  background: linear-gradient(90deg, var(--ice), var(--mint));
  transition: width 0.35s ease;
}
.flip { perspective: 1200px; cursor: pointer; }
.flip-inner {
  position: relative; min-height: 300px;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.35, 0.15, 0.25, 1);
}
.flip.revealed { cursor: default; }
.flip.revealed .flip-inner { transform: rotateY(180deg); }
.flip-face {
  position: absolute; inset: 0;
  -webkit-backface-visibility: hidden; backface-visibility: hidden;
  border-radius: 24px;
  padding: 2.2rem 1.5rem;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  gap: 1rem; text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-lg);
}
.flip-front {
  background: linear-gradient(140deg, rgba(255,255,255,0.95), rgba(169, 204, 227, 0.35));
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
}
.flip-back {
  background: linear-gradient(140deg, rgba(255,255,255,0.97), rgba(127, 196, 178, 0.35));
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  transform: rotateY(180deg);
}
.flip-face .q { font-family: 'Sora', sans-serif; font-size: 1.65rem; font-weight: 800; line-height: 1.3; }
.flip-face .a { font-size: 1.2rem; color: var(--ink-soft); line-height: 1.5; }
.flip-face .tap-hint { font-size: 0.8rem; color: var(--slate); font-weight: 600; }
.flip-face .note { font-size: 0.85rem; color: var(--slate); font-style: italic; max-width: 90%; }
.speak-row { display: flex; justify-content: center; }

.grades { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.55rem; margin-top: 1.1rem; }
.grade {
  border: 1px solid rgba(255, 255, 255, 0.9); border-radius: 16px;
  padding: 0.85rem 0.2rem; cursor: pointer; font-weight: 700; font-size: 0.87rem;
  display: flex; flex-direction: column; gap: 0.15rem; align-items: center;
  background: var(--glass);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
  box-shadow: var(--shadow-sm);
  transition: transform 0.12s ease;
  font-family: 'Inter', sans-serif;
}
.grade small { font-weight: 500; color: var(--ink-soft); font-size: 0.68rem; }
.grade-again { background: linear-gradient(160deg, rgba(217,160,172,0.35), rgba(255,255,255,0.7)); }
.grade-hard  { background: linear-gradient(160deg, rgba(232,200,126,0.35), rgba(255,255,255,0.7)); }
.grade-good  { background: linear-gradient(160deg, rgba(127,196,178,0.35), rgba(255,255,255,0.7)); }
.grade-easy  { background: linear-gradient(160deg, rgba(169,204,227,0.4), rgba(255,255,255,0.7)); }
.grade:active { transform: scale(0.95); }

.study-summary {
  border: 1px solid rgba(255, 255, 255, 0.9); border-radius: 24px;
  background: linear-gradient(140deg, rgba(255,255,255,0.95), rgba(127, 196, 178, 0.3));
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  padding: 2.4rem 1.5rem; text-align: center;
  box-shadow: var(--shadow-lg);
}
.study-summary h2 { margin-top: 0; font-size: 1.5rem; }
.study-summary .big-emoji { font-size: 3rem; }

/* ---------- import ---------- */
textarea {
  width: 100%; font-family: ui-monospace, monospace; font-size: 0.82rem;
  border: 1px solid var(--line); border-radius: 14px;
  padding: 0.85rem; margin: 0.75rem 0; background: rgba(255,255,255,0.9); color: var(--ink);
  box-shadow: var(--shadow-sm);
}
.import-controls { display: flex; gap: 0.6rem; flex-wrap: wrap; margin-top: 0.5rem; }
.csv-errors {
  border: 1px solid var(--rose); background: rgba(217, 160, 172, 0.18); color: var(--danger);
  border-radius: var(--radius); padding: 0.85rem 1rem; margin: 0.75rem 0; font-size: 0.85rem;
}
.csv-errors ul { margin: 0.4rem 0 0; padding-left: 1.2rem; }
.preview-row .front { font-weight: 600; }
.preview-row .back { font-size: 0.85rem; color: var(--ink-soft); }

/* ---------- prompt template ---------- */
.prompt-box {
  border: 1px solid rgba(255, 255, 255, 0.9); border-radius: 20px;
  background: var(--glass);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  padding: 1.1rem; margin-top: 0.75rem;
  box-shadow: var(--shadow-md);
}
.prompt-box pre {
  white-space: pre-wrap; font-family: ui-monospace, monospace;
  font-size: 0.82rem; line-height: 1.6; margin: 0 0 1rem; color: var(--ink);
}

/* ---------- settings ---------- */
.settings-group {
  border: 1px solid rgba(255, 255, 255, 0.9); border-radius: 20px;
  padding: 1.1rem; margin: 0.8rem 0; background: var(--glass);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}
.settings-group h2 { margin-top: 0; }

/* ---------- modal ---------- */
.modal {
  position: fixed; inset: 0;
  background: rgba(34, 51, 59, 0.45);
  -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px);
  display: flex; align-items: flex-end; justify-content: center; z-index: 20;
}
.modal[hidden] { display: none; }
.modal-card {
  background: var(--canvas); border-radius: 24px 24px 0 0;
  padding: 1.5rem 1.4rem calc(1.4rem + env(safe-area-inset-bottom));
  width: 100%; max-width: 680px;
  display: grid; gap: 0.85rem;
  box-shadow: var(--shadow-lg);
  animation: sheet-up 0.3s cubic-bezier(0.3, 1.2, 0.4, 1) both;
}
@keyframes sheet-up {
  from { transform: translateY(40px); opacity: 0.6; }
  to   { transform: none; opacity: 1; }
}
.modal-card h2 { margin: 0; }
.modal-card label { display: grid; gap: 0.35rem; font-size: 0.85rem; font-weight: 600; }
.modal-card input {
  font-family: 'Inter', sans-serif; font-size: 1rem;
  border: 1px solid var(--line); border-radius: 12px; padding: 0.75rem;
  background: #fff;
}
.modal-card input:focus { outline: 2px solid var(--ice); border-color: var(--ice); }
@media (min-width: 640px) {
  .modal { align-items: center; padding: 1rem; }
  .modal-card { border-radius: 24px; padding-bottom: 1.5rem; }
}

/* ---------- bottom nav: floating pill ---------- */
.bottomnav {
  position: fixed; z-index: 10;
  left: 50%; transform: translateX(-50%);
  bottom: calc(14px + env(safe-area-inset-bottom));
  width: min(430px, calc(100% - 28px));
  background: rgba(34, 51, 59, 0.88);
  -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  display: flex;
  padding: 6px;
  box-shadow: 0 14px 40px rgba(34, 51, 59, 0.35);
}
.tab {
  flex: 1; border: none; background: none; cursor: pointer;
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 0.55rem 0 0.5rem; font-size: 1.2rem; color: rgba(253, 254, 254, 0.6);
  border-radius: 999px;
  transition: background 0.2s ease, color 0.2s ease;
}
.tab span { font-size: 0.66rem; font-weight: 600; font-family: 'Inter', sans-serif; letter-spacing: 0.02em; }
.tab.active { background: rgba(169, 204, 227, 0.22); color: #fff; }

/* ---------- toast ---------- */
.toast {
  position: fixed; bottom: 104px; left: 50%; transform: translateX(-50%);
  background: var(--ink); color: #fff; font-size: 0.85rem; font-weight: 500;
  padding: 0.75rem 1.2rem; border-radius: 999px; z-index: 30;
  max-width: 90vw; text-align: center;
  box-shadow: 0 10px 30px rgba(34, 51, 59, 0.35);
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}