:root {
  --bg: #0e1013;
  --panel: #171a20;
  --panel2: #1e222b;
  --border: #262b36;
  --text: #e8eaf0;
  --muted: #8b93a7;
  --accent: #7c6cf6;
  --accent2: #a78bfa;
  --green: #34d399;
  --amber: #fbbf24;
  --red: #f87171;
  --blue: #60a5fa;
  --radius: 16px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: radial-gradient(1200px 600px at 70% -10%, #1b1740 0%, var(--bg) 55%);
  color: var(--text);
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", sans-serif;
  min-height: 100vh;
}

/* ---------- header ---------- */
header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 24px; gap: 16px; flex-wrap: wrap;
}
.brand { font-size: 22px; font-weight: 800; letter-spacing: .3px; }
.brand span { background: linear-gradient(90deg, var(--accent), var(--accent2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.header-stats { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

.chip {
  background: var(--panel); border: 1px solid var(--border); border-radius: 999px;
  padding: 7px 14px; display: flex; align-items: center; gap: 8px; font-size: 14px;
}
.level-chip { min-width: 190px; }
#level-label { font-weight: 700; color: var(--accent2); white-space: nowrap; }
.xpbar { flex: 1; height: 7px; background: var(--panel2); border-radius: 99px; overflow: hidden; min-width: 60px; }
#xpbar-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), var(--accent2)); border-radius: 99px; transition: width .5s ease; }
#xp-label { font-size: 12px; white-space: nowrap; }
.muted { color: var(--muted); }

.goal-ring { position: relative; width: 46px; height: 46px; }
.goal-ring svg { width: 46px; height: 46px; transform: rotate(-90deg); }
.ring-bg { fill: none; stroke: var(--panel2); stroke-width: 5; }
.ring-fg {
  fill: none; stroke: var(--green); stroke-width: 5; stroke-linecap: round;
  stroke-dasharray: 100.5; stroke-dashoffset: 100.5; transition: stroke-dashoffset .5s ease;
}
.goal-text {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  font-size: 10px; font-weight: 700;
}

/* ---------- nav ---------- */
nav { display: flex; gap: 6px; padding: 0 24px 8px; }
.tab {
  background: none; border: none; color: var(--muted); font-size: 15px; font-weight: 600;
  padding: 9px 16px; border-radius: 10px; cursor: pointer; transition: .15s;
}
.tab:hover { color: var(--text); background: var(--panel); }
.tab.active { color: var(--text); background: var(--panel); box-shadow: inset 0 -2px 0 var(--accent); }

main { max-width: 860px; margin: 0 auto; padding: 16px 24px 80px; }
.hidden { display: none !important; }

/* ---------- train ---------- */
.train-meta { color: var(--muted); font-size: 14px; margin-bottom: 14px; display: flex; gap: 14px; flex-wrap: wrap; }
.train-meta b { color: var(--text); }

.card {
  background: linear-gradient(180deg, var(--panel) 0%, #14161c 100%);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 44px 36px 28px; text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,.35);
  animation: pop .18s ease;
}
@keyframes pop { from { transform: scale(.98); opacity: .6; } to { transform: scale(1); opacity: 1; } }

.new-badge {
  display: inline-block; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px;
  color: var(--blue); border: 1px solid var(--blue); border-radius: 999px; padding: 3px 10px; margin-bottom: 14px;
}
.word-line { display: flex; align-items: center; justify-content: center; gap: 12px; }
.card-word { font-size: 44px; font-weight: 800; letter-spacing: .5px; word-break: break-word; }
.say-btn {
  background: var(--panel2); border: 1px solid var(--border); border-radius: 50%;
  width: 44px; height: 44px; font-size: 19px; cursor: pointer; transition: .15s; flex: none;
}
.say-btn:hover { transform: scale(1.08); border-color: var(--accent); }
.say-btn.playing { border-color: var(--green); box-shadow: 0 0 0 3px rgba(52,211,153,.2); }
.card-phonetic { margin-top: 6px; color: var(--muted); font-size: 16px; letter-spacing: .5px; }

.hint-box {
  margin: 18px auto 0; max-width: 420px; background: rgba(124,108,246,.07);
  border: 1px solid rgba(124,108,246,.25); border-radius: 14px; padding: 14px; text-align: center;
  animation: pop .2s ease;
}
.hint-box img { max-width: 100%; width: 300px; border-radius: 10px; margin-bottom: 10px; }
.hint-box p { color: var(--accent2); font-size: 14px; font-style: italic; }
.hint-box.loading p { color: var(--muted); }
.card-context { margin-top: 14px; color: var(--muted); font-style: italic; font-size: 15px; }
.card-context mark { background: none; color: var(--accent2); font-weight: 700; font-style: normal; }
.card-source { display: inline-block; margin-top: 8px; color: var(--blue); font-size: 13px; text-decoration: none; opacity: .8; }
.card-source:hover { opacity: 1; }
.divider { height: 1px; background: var(--border); margin: 24px auto; width: 60%; }
.card-translation { font-size: 30px; font-weight: 600; color: var(--green); animation: pop .18s ease; }

.card-actions { margin-top: 30px; }
.btn {
  border: 1px solid var(--border); background: var(--panel2); color: var(--text);
  border-radius: 12px; padding: 11px 18px; font-size: 15px; font-weight: 600; cursor: pointer;
  transition: .12s;
}
.btn:hover { filter: brightness(1.15); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: linear-gradient(90deg, var(--accent), #8b5cf6); border: none; }
.btn-big { font-size: 17px; padding: 14px 28px; }
kbd {
  font: 11px monospace; background: rgba(255,255,255,.12); border-radius: 5px;
  padding: 2px 6px; margin-left: 8px; vertical-align: middle;
}

.action-row { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; align-items: center; }
.btn-ghost { background: transparent; color: var(--muted); }
.btn-ghost:hover { color: var(--text); border-color: var(--accent); }

.grade-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.grade {
  display: flex; align-items: center; gap: 9px; min-width: 128px; justify-content: center;
  padding: 13px 20px; border-radius: 999px; font-size: 15px; border: 1px solid transparent;
}
.g-emoji { font-size: 19px; }
.grade-again { background: rgba(248,113,113,.12); border-color: rgba(248,113,113,.35); color: #fca5a5; }
.grade-again:hover { background: rgba(248,113,113,.22); }
.grade-hard  { background: rgba(251,191,36,.10); border-color: rgba(251,191,36,.35); color: #fcd34d; }
.grade-hard:hover { background: rgba(251,191,36,.20); }
.grade-easy  { background: rgba(52,211,153,.12); border-color: rgba(52,211,153,.35); color: #6ee7b7; }
.grade-easy:hover { background: rgba(52,211,153,.22); }

.key-hint { font-size: 12px; margin-top: 14px; opacity: .55; }
@media (pointer: coarse) { .key-hint { display: none; } }

.session-bar { margin-top: 18px; height: 8px; background: var(--panel2); border-radius: 99px; overflow: hidden; }
#session-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--green), #6ee7b7); transition: width .3s ease; }

.empty { text-align: center; padding: 70px 20px; }
.empty-emoji { font-size: 64px; margin-bottom: 12px; }
.empty p { color: var(--muted); margin-top: 8px; }

.session-summary { display: flex; gap: 14px; justify-content: center; margin: 26px 0 8px; }
.ss-item {
  background: var(--panel); border: 1px solid var(--border); border-radius: 14px;
  padding: 14px 22px; display: flex; flex-direction: column; gap: 2px; min-width: 96px;
}
.ss-item b { font-size: 24px; }
.ss-item span { color: var(--muted); font-size: 12px; }
#share-session { margin-top: 18px; }

.share-panel .btn { margin-top: 6px; }
.share-panel p { margin-bottom: 10px; font-size: 14px; }

/* ---------- words ---------- */
.add-form { display: flex; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; }
.add-form input, .search, #token-input, .goal-edit input {
  background: var(--panel); border: 1px solid var(--border); color: var(--text);
  border-radius: 12px; padding: 11px 14px; font-size: 15px; outline: none;
}
.add-form input:focus, .search:focus, #token-input:focus { border-color: var(--accent); }
#add-word { flex: 1; min-width: 160px; }
#add-translation { flex: 1.4; min-width: 200px; }
.search { width: 100%; margin-bottom: 14px; }

.words-list { display: flex; flex-direction: column; gap: 8px; }
.word-row {
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
  padding: 12px 16px; display: flex; align-items: center; gap: 14px;
}
.word-main { flex: 1; min-width: 0; }
.word-w { font-weight: 700; font-size: 17px; }
.word-ph { font-size: 12px; margin-left: 6px; }
.word-t { color: var(--muted); font-size: 14px; }
.word-t.missing { color: var(--amber); font-style: italic; }
.word-ctx { color: #5b6374; font-size: 12px; font-style: italic; margin-top: 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.badge {
  font-size: 11px; font-weight: 700; border-radius: 999px; padding: 3px 10px; white-space: nowrap;
}
.badge.due { background: rgba(52,211,153,.14); color: var(--green); }
.badge.new { background: rgba(96,165,250,.14); color: var(--blue); }
.badge.later { background: var(--panel2); color: var(--muted); }
.icon-btn {
  background: none; border: none; color: var(--muted); cursor: pointer; font-size: 16px;
  padding: 6px; border-radius: 8px; transition: .12s;
}
.icon-btn:hover { color: var(--text); background: var(--panel2); }
.icon-btn.danger:hover { color: var(--red); }

/* ---------- import ---------- */
.import-panel { margin-bottom: 14px; }
.imp-tabs { display: flex; gap: 8px; margin-bottom: 12px; }
.imp-tab { font-size: 13px; padding: 8px 14px; color: var(--muted); background: transparent; }
.imp-tab.active { color: var(--text); border-color: var(--accent); background: var(--panel2); }
#imp-text {
  width: 100%; background: var(--panel2); border: 1px solid var(--border); color: var(--text);
  border-radius: 12px; padding: 11px 14px; font-size: 14px; outline: none; resize: vertical;
  font-family: inherit;
}
#imp-text:focus, #imp-url:focus { border-color: var(--accent); }
#imp-url {
  width: 100%; background: var(--panel2); border: 1px solid var(--border); color: var(--text);
  border-radius: 12px; padding: 11px 14px; font-size: 14px; outline: none;
}
.imp-controls { display: flex; align-items: center; gap: 14px; margin-top: 12px; flex-wrap: wrap; }
.imp-controls label { font-size: 13px; }
#imp-count {
  width: 64px; background: var(--panel2); border: 1px solid var(--border); color: var(--text);
  border-radius: 8px; padding: 6px 8px; margin-left: 4px;
}
.imp-actions { display: flex; align-items: center; gap: 10px; margin: 14px 0 10px; flex-wrap: wrap; }
#imp-selected { font-size: 13px; margin-right: auto; }
.imp-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 8px; }
.imp-item {
  display: flex; align-items: center; gap: 9px; background: var(--panel2);
  border: 1px solid var(--border); border-radius: 10px; padding: 9px 12px; cursor: pointer;
  transition: .12s; user-select: none;
}
.imp-item:hover { border-color: var(--accent); }
.imp-item input { accent-color: var(--accent); width: 15px; height: 15px; flex: none; }
.imp-item.off { opacity: .45; }
.imp-w { font-weight: 700; }
.imp-t { color: var(--muted); font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.imp-item .meta-badge { margin-left: auto; flex: none; }

.word-edit { display: flex; gap: 8px; flex: 1; flex-wrap: wrap; }
.word-edit input { flex: 1; min-width: 120px; background: var(--panel2); border: 1px solid var(--accent); color: var(--text); border-radius: 8px; padding: 6px 10px; font-size: 14px; }

/* ---------- progress ---------- */
.stat-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-bottom: 16px; }
.stat-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; text-align: center; }
.stat-num { font-size: 32px; font-weight: 800; background: linear-gradient(90deg, var(--accent2), var(--blue)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat-label { color: var(--muted); font-size: 13px; margin-top: 2px; }

.panel { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 16px; }
.panel h3 { font-size: 15px; margin-bottom: 14px; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: .5px; }

.heatmap { display: flex; gap: 3px; overflow-x: auto; padding-bottom: 6px; }
.heat-col { display: flex; flex-direction: column; gap: 3px; }
.hcell { width: 13px; height: 13px; border-radius: 3px; background: var(--panel2); flex: none; display: inline-block; }
.h1 { background: #3b2f78; } .h2 { background: #5847b8; } .h3 { background: #7c6cf6; } .h4 { background: #b3a5ff; }
.heat-legend { display: flex; align-items: center; gap: 4px; color: var(--muted); font-size: 12px; margin-top: 10px; }
.heat-legend .hcell { width: 11px; height: 11px; }

.goal-edit { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.goal-edit input { width: 90px; }

/* ---------- overlay / toast / celebrate ---------- */
.overlay {
  position: fixed; inset: 0; background: rgba(8,9,12,.8); backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center; z-index: 50;
}
.overlay-card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px; width: 360px; max-width: 92vw; display: flex; flex-direction: column; gap: 14px;
}
.overlay-card p { color: var(--muted); font-size: 14px; }
.err { color: var(--red) !important; font-size: 13px; }
.gsi-btn { display: flex; justify-content: center; min-height: 44px; }
#token-block summary { cursor: pointer; font-size: 12px; }
#token-block input { width: 100%; margin: 10px 0; }

.card-meta { margin-top: 12px; display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.meta-badge {
  font-size: 11px; font-weight: 600; color: var(--muted);
  background: var(--panel2); border: 1px solid var(--border);
  border-radius: 999px; padding: 3px 10px;
}
.meta-badge.lvl { color: var(--accent2); border-color: rgba(167,139,250,.4); }
.word-badges { display: inline-flex; gap: 5px; margin-left: 8px; vertical-align: middle; }
.word-badges .meta-badge { font-size: 10px; padding: 2px 8px; }

.toast {
  position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%);
  background: var(--panel2); border: 1px solid var(--border); border-radius: 12px;
  padding: 12px 22px; font-weight: 700; z-index: 60; box-shadow: 0 10px 40px rgba(0,0,0,.5);
  animation: toast-in .25s ease;
}
.toast.xp { color: var(--accent2); }
.toast.ok { color: var(--green); }
.toast.err-t { color: var(--red); }
@keyframes toast-in { from { transform: translate(-50%, 16px); opacity: 0; } to { transform: translate(-50%, 0); opacity: 1; } }

.celebrate { position: fixed; inset: 0; pointer-events: none; z-index: 55; overflow: hidden; }
.confetti-piece { position: absolute; bottom: -30px; font-size: 26px; animation: fly 1.8s ease-out forwards; }
@keyframes fly {
  0% { transform: translateY(0) rotate(0); opacity: 1; }
  100% { transform: translateY(-90vh) rotate(360deg); opacity: 0; }
}

@media (max-width: 640px) {
  .card-word { font-size: 32px; }
  .card { padding: 30px 18px 22px; }
  main { padding: 10px 14px 60px; }
  header, nav { padding-left: 14px; padding-right: 14px; }
}