:root {
  --bg: #eef4ff;
  --glass: rgba(255, 255, 255, 0.55);
  --glass-strong: rgba(255, 255, 255, 0.72);
  --border: rgba(255, 255, 255, 0.65);
  --text: #14213d;
  --muted: #5b6b8c;
  --primary: #ff8a3d;
  --primary-2: #3d7bff;
  --success: #1f9d66;
  --danger: #d64545;
  --radius: 20px;
  --shadow: 0 10px 30px rgba(31, 68, 140, 0.14);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: linear-gradient(160deg, #dbeafe 0%, #e0f2fe 45%, #fef3c7 100%);
  color: var(--text);
  min-height: 100dvh;
  padding: 12px 12px calc(88px + var(--safe-bottom));
}

.bg-orb { position: fixed; border-radius: 999px; filter: blur(10px); opacity: 0.5; pointer-events: none; z-index: -1; }
.orb-a { width: 220px; height: 220px; background: #93c5fd; top: -60px; left: -50px; }
.orb-b { width: 180px; height: 180px; background: #fda4af; top: 35%; right: -70px; }
.orb-c { width: 260px; height: 260px; background: #fde68a; bottom: -90px; left: 25%; }

.glass {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px) saturate(150%);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
}

.app-header {
  display: flex; justify-content: space-between; gap: 12px; align-items: flex-start;
  padding: 16px; max-width: 980px; margin: 0 auto 12px;
}
.eyebrow { margin: 0; color: var(--primary-2); font-weight: 700; font-size: 0.78rem; letter-spacing: 0.06em; text-transform: uppercase; }
h1 { margin: 4px 0; font-size: clamp(1.25rem, 5vw, 1.8rem); line-height: 1.2; }
.sub, .muted { color: var(--muted); }
.sub { margin: 0; font-size: 0.9rem; }

.stats-mini { display: flex; gap: 8px; }
.stats-mini div { background: var(--glass-strong); border: 1px solid var(--border); border-radius: 14px; padding: 8px 10px; text-align: center; min-width: 64px; }
.stats-mini strong { display: block; font-size: 1.05rem; }
.stats-mini span { font-size: 0.72rem; color: var(--muted); }

.tabbar {
  position: sticky; top: 8px; z-index: 20;
  display: flex; gap: 6px; padding: 6px; max-width: 980px; margin: 0 auto 12px;
}
.tab {
  flex: 1; min-height: 48px; border: 1px solid transparent; border-radius: 14px;
  background: transparent; color: var(--text); font-weight: 700; cursor: pointer;
}
.tab.active { background: linear-gradient(135deg, var(--primary), #ffb25e); color: #fff; }

main { max-width: 980px; margin: 0 auto; }
.view { display: none; }
.view.active { display: block; }

.toolbar { padding: 12px; margin-bottom: 12px; }
.searchbox { display: flex; align-items: center; gap: 8px; background: var(--glass-strong); border: 1px solid var(--border); border-radius: 14px; padding: 0 12px; min-height: 48px; }
.searchbox input { flex: 1; border: 0; outline: 0; background: transparent; font-size: 16px; color: var(--text); min-height: 46px; }

.chip-row { display: flex; gap: 8px; overflow-x: auto; padding: 10px 2px 2px; scrollbar-width: none; }
.chip-row::-webkit-scrollbar { display: none; }
.chip { white-space: nowrap; min-height: 40px; padding: 0 14px; border-radius: 999px; border: 1px solid var(--border); background: var(--glass-strong); cursor: pointer; font-weight: 600; }
.chip.active { background: var(--primary-2); color: #fff; }

.filter-row { display: flex; gap: 8px; margin-top: 10px; }
.pill, select { min-height: 44px; border-radius: 12px; border: 1px solid var(--border); background: var(--glass-strong); padding: 0 12px; font-size: 0.95rem; }
.pill.active { background: #f59e0b; color: #fff; }

.btn {
  min-height: 48px; padding: 0 16px; border-radius: 14px; border: 1px solid var(--border);
  background: var(--glass-strong); color: var(--text); font-weight: 700; cursor: pointer;
}
.btn.primary { background: linear-gradient(135deg, var(--primary), #ffb25e); color: #fff; border-color: transparent; }
.btn.success { background: linear-gradient(135deg, var(--success), #34c98a); color: #fff; border-color: transparent; }
.btn.danger { background: #fff1f2; color: var(--danger); }
.btn.small { min-height: 40px; padding: 0 12px; font-size: 0.88rem; }
.btn.wide { width: 100%; margin-top: 12px; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

.flash-wrap { display: grid; gap: 12px; }
.flash-card { perspective: 1200px; min-height: min(52dvh, 430px); cursor: pointer; padding: 0; overflow: hidden; }
.flash-inner { position: relative; min-height: inherit; transform-style: preserve-3d; transition: transform 0.45s ease; }
.flash-card.flipped .flash-inner { transform: rotateY(180deg); }
.flash-face { position: absolute; inset: 0; padding: 18px; backface-visibility: hidden; -webkit-backface-visibility: hidden; display: flex; flex-direction: column; }
.flash-back { transform: rotateY(180deg); overflow: auto; }
.card-top { display: flex; justify-content: space-between; align-items: center; }
.badge { background: rgba(61, 123, 255, 0.14); color: var(--primary-2); border: 1px solid rgba(61, 123, 255, 0.25); padding: 6px 10px; border-radius: 999px; font-weight: 700; font-size: 0.78rem; }
.icon-btn { width: 48px; height: 48px; border-radius: 999px; border: 1px solid var(--border); background: var(--glass-strong); font-size: 1.35rem; cursor: pointer; }
.icon-btn.active { color: #f59e0b; }

#cardWord { font-size: clamp(1.7rem, 8vw, 2.6rem); margin: 18px 0 4px; line-height: 1.12; overflow-wrap: anywhere; }
.ipa { font-size: 1.05rem; color: var(--muted); margin: 0; }
.pos { color: var(--primary-2); font-weight: 700; }
.audio-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: auto; }
.hint { color: var(--muted); font-size: 0.85rem; margin-bottom: 0; }
.meaning { font-size: 1.35rem; font-weight: 800; margin-top: 0; }
.def { color: var(--muted); }
.example-box { background: rgba(255,255,255,0.55); border: 1px solid var(--border); border-radius: 14px; padding: 12px; }
.example-box .vi { color: var(--muted); }
.related { font-size: 0.92rem; }

.nav-row { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.nav-row .btn { flex: 1; }
#cardCounter { font-weight: 800; min-width: 64px; text-align: center; }
.status-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.status.active { outline: 2px solid var(--primary-2); }

.progress { padding: 12px; }
.progress-head { display: flex; justify-content: space-between; }
.bar { height: 10px; background: rgba(20,33,61,0.1); border-radius: 999px; overflow: hidden; margin-top: 8px; }
#progressBar { height: 100%; width: 0%; background: linear-gradient(90deg, var(--primary-2), var(--success)); transition: width 0.3s; }

.word-list { display: grid; gap: 10px; }
.word-item { padding: 14px; }
.word-item-head { display: flex; justify-content: space-between; gap: 8px; align-items: flex-start; }
.word-item h3 { margin: 0; font-size: 1.15rem; }
.word-item p { margin: 6px 0; }
.word-actions { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }

.panel { padding: 16px; }
.notice {
  background: rgba(61, 123, 255, 0.12);
  border: 1px solid rgba(61, 123, 255, 0.28);
  color: #174ea6;
  border-radius: 14px;
  padding: 12px;
  margin: 12px 0;
  font-weight: 600;
}
.auth-user { background: rgba(255,255,255,0.55); border: 1px solid var(--border); border-radius: 14px; padding: 12px; }
.auth-form { margin-top: 12px; }
.auth-actions { align-items: center; }
.small-text { font-size: 0.85rem; }
.account-panel code { background: rgba(20,33,61,0.08); padding: 1px 5px; border-radius: 6px; }
.quiz-controls { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.quiz-q { background: rgba(255,255,255,0.55); border: 1px solid var(--border); border-radius: 14px; padding: 12px; margin-top: 12px; }
.quiz-q h3 { margin: 0 0 8px; }
.quiz-opt { display: block; width: 100%; text-align: left; margin: 6px 0; }
.quiz-opt.correct { background: #dcfce7; }
.quiz-opt.wrong { background: #fee2e2; }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.form-grid .full { grid-column: 1 / -1; }
label { font-weight: 700; font-size: 0.9rem; }
label input, label textarea, textarea, input[type="url"], input[type="password"], input[type="text"] {
  width: 100%; margin-top: 6px; border: 1px solid var(--border); border-radius: 12px;
  background: rgba(255,255,255,0.8); padding: 12px; font-size: 16px; color: var(--text);
}
.block { display: block; margin-top: 12px; }
.row-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.sep { border: 0; border-top: 1px solid var(--border); margin: 16px 0; }
.preview img { max-width: 100%; border-radius: 14px; border: 1px solid var(--border); margin-top: 10px; }
.ai-result { white-space: pre-wrap; background: rgba(255,255,255,0.5); border: 1px solid var(--border); border-radius: 14px; padding: 12px; margin-top: 12px; }

dialog { border: 1px solid var(--border); border-radius: 20px; background: #f8fbff; max-width: min(92vw, 560px); width: 100%; }
dialog::backdrop { background: rgba(20,33,61,0.35); backdrop-filter: blur(3px); }

#toast {
  position: fixed; left: 50%; bottom: calc(18px + var(--safe-bottom)); transform: translateX(-50%) translateY(20px);
  background: rgba(20,33,61,0.92); color: #fff; padding: 10px 14px; border-radius: 999px;
  opacity: 0; pointer-events: none; transition: 0.25s; z-index: 50; max-width: 92vw; text-align: center;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 700px) {
  body { padding: 8px 8px calc(84px + var(--safe-bottom)); }
  .app-header { flex-direction: column; }
  .stats-mini { width: 100%; }
  .stats-mini div { flex: 1; }
  .tabbar { top: 6px; }
  .flash-card { min-height: min(56dvh, 460px); }
  .form-grid { grid-template-columns: 1fr; }
  .status-row { grid-template-columns: 1fr; }
  .status-row .btn { width: 100%; }
}

@media (max-width: 480px) and (max-aspect-ratio: 9/18) {
  .app-header { padding: 12px; }
  .toolbar, .panel { padding: 10px; }
  .flash-card { min-height: 54dvh; }
  #cardWord { font-size: clamp(1.55rem, 9vw, 2.2rem); }
  .audio-row .btn, .nav-row .btn { min-height: 48px; }
}

@media (min-width: 760px) {
  .word-list { grid-template-columns: 1fr 1fr; }
  .flash-card { min-height: 430px; }
}