:root {
  --bg: #0f1420;
  --card: #1a2234;
  --card2: #222c42;
  --accent: #6ea8fe;
  --accent2: #ffd166;
  --text: #e8edf6;
  --muted: #8b97ad;
  --green: #4ade80;
  --border: #2a3550;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
[hidden] { display: none !important; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", sans-serif;
  background: linear-gradient(160deg, #0f1420 0%, #151c2c 100%);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}
header {
  width: 100%;
  max-width: 760px;
  padding: 20px 18px 8px;
  text-align: center;
}
header h1 { font-size: 18px; margin: 0; font-weight: 700; }
header p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }

.authbar {
  display: flex; align-items: center; justify-content: center;
  gap: 10px; margin-top: 12px; flex-wrap: wrap;
}
.authbtn {
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  padding: 8px 14px; border-radius: 99px; font-size: 13px; font-weight: 600; cursor: pointer;
}
.authbtn:hover { background: var(--card2); }
.authbtn:disabled { opacity: .5; cursor: default; }
.authbtn.small { padding: 6px 10px; font-size: 12px; color: var(--muted); }
.userbox { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text); }
.userpic { width: 24px; height: 24px; border-radius: 50%; background: var(--card2); object-fit: cover; }
.syncmsg { font-size: 12px; color: var(--muted); min-height: 14px; }

.tabs {
  display: flex; gap: 8px; width: 100%; max-width: 760px; padding: 14px 18px 0;
}
.tab {
  flex: 1; padding: 12px 8px; border: 1px solid var(--border); background: var(--card);
  color: var(--muted); border-radius: 12px; font-size: 15px; font-weight: 600;
  cursor: pointer; transition: all .15s;
}
.tab.active { background: var(--accent); color: #0f1420; border-color: var(--accent); }

main { width: 100%; max-width: 760px; padding: 18px; flex: 1; }
.view { display: none; }
.view.active { display: block; }

.progress {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 12px;
}
.bar { flex: 1; height: 6px; background: var(--card2); border-radius: 99px; margin: 0 12px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--accent); width: 0%; transition: width .25s; }

/* 단어 플래시카드 */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 36px 22px;
  min-height: 240px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  cursor: pointer;
  user-select: none;
  position: relative;
}
.card .pos {
  position: absolute; top: 14px; left: 16px;
  font-size: 12px; font-weight: 700; padding: 3px 9px; border-radius: 99px;
}
.pos.verb { background: rgba(110,168,254,.18); color: var(--accent); }
.pos.noun { background: rgba(255,209,102,.18); color: var(--accent2); }
.pos.adj { background: rgba(74,222,128,.18); color: var(--green); }
.card .mark {
  position: absolute; top: 10px; right: 12px;
  background: transparent; border: none; cursor: pointer;
  font-size: 26px; line-height: 1; color: var(--muted);
  padding: 4px; transition: transform .1s, color .12s;
}
.card .mark:hover { transform: scale(1.15); }
.card .mark.on { color: var(--accent2); }
.card.unknown { border-color: var(--accent2); box-shadow: 0 0 0 1px rgba(255,209,102,.25); }
.card .word { font-size: 34px; font-weight: 800; letter-spacing: .3px; user-select: text; cursor: text; }
.card .speak {
  margin-top: 12px; background: var(--card2); border: 1px solid var(--border);
  color: var(--text); border-radius: 99px; padding: 8px 16px; font-size: 18px;
  cursor: pointer; transition: transform .1s, background .12s;
}
.card .speak:hover { background: #2c3a5a; }
.card .speak:active { transform: scale(.92); }
.card .speak.speaking { background: var(--accent); border-color: var(--accent); }
.card .gender { font-size: 15px; color: var(--muted); margin-top: 4px; user-select: text; cursor: text; }
.card .meaning {
  margin-top: 18px; font-size: 22px; color: var(--green); font-weight: 600;
  min-height: 28px; user-select: text; cursor: text;
}
.card .hint { margin-top: 16px; font-size: 12px; color: var(--muted); }

/* 구절 카드 (Part B) */
.versecard { min-height: 300px; }
.versecard .ref {
  position: absolute; top: 14px; left: 16px;
  font-size: 12px; font-weight: 700; padding: 3px 9px; border-radius: 99px;
  background: rgba(110,168,254,.18); color: var(--accent);
}
.versecard .verse-da {
  font-size: 21px; line-height: 1.55; font-weight: 600;
  user-select: text; cursor: text; margin-top: 10px;
}
.versecard .verse-back { margin-top: 18px; min-height: 24px; }
.versecard .verse-en {
  font-size: 16px; line-height: 1.5; color: var(--text);
  user-select: text; cursor: text;
}
.versecard .verse-ko {
  font-size: 16px; line-height: 1.5; color: var(--green); font-weight: 600;
  margin-top: 10px; user-select: text; cursor: text;
}

.controls {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}
button.nav {
  flex: 1;
  padding: 16px;
  border: 1px solid var(--border);
  background: var(--card2);
  color: var(--text);
  border-radius: 14px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background .12s;
}
button.nav:hover { background: #2c3a5a; }
button.nav:active { transform: scale(.98); }
button.nav.primary { background: var(--accent); color: #0f1420; border-color: var(--accent); }
button.nav:disabled { opacity: .35; cursor: default; }

.filters { display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.chip {
  padding: 8px 14px; border-radius: 99px; border: 1px solid var(--border);
  background: var(--card); color: var(--muted); font-size: 13px; font-weight: 600; cursor: pointer;
}
.chip.active { background: var(--accent); color: #0f1420; border-color: var(--accent); }
.vchip {
  padding: 8px 14px; border-radius: 99px; border: 1px solid var(--border);
  background: var(--card); color: var(--muted); font-size: 13px; font-weight: 600; cursor: pointer;
}
.vchip.active { background: var(--accent); color: #0f1420; border-color: var(--accent); }
.toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; gap: 8px; }
.small { padding: 8px 12px; font-size: 13px; border-radius: 10px; border: 1px solid var(--border); background: var(--card); color: var(--muted); cursor: pointer; font-weight: 600; }
footer { color: var(--muted); font-size: 12px; padding: 10px 0 24px; text-align: center; }