/* IELTS 單字庫 — styles */
:root {
  --bg: #f7f6f3;
  --card: #ffffff;
  --ink: #1f2328;
  --muted: #6a6f76;
  --line: #e6e3dd;
  --accent: #2f5bd3;
  --accent-soft: #eef2fc;
  --gold: #e8a13a;
  --green: #2e8b57;
  --red: #c0392b;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20,24,30,.05), 0 6px 20px rgba(20,24,30,.07);
  --sans: "Segoe UI", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  --serif: Georgia, "Noto Serif TC", "Songti TC", serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--sans); line-height: 1.6; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.muted { color: var(--muted); }
small { font-size: .78em; }

/* top bar */
.topbar { position: sticky; top: 0; z-index: 40; background: rgba(247,246,243,.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.topbar-inner { display: flex; align-items: center; gap: 18px; height: 62px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; }
.brand:hover { text-decoration: none; }
.brand-mark { background: var(--ink); color: #fff; font-weight: 800; letter-spacing: .06em; padding: 4px 9px; border-radius: 8px; font-size: 13px; }
.brand-text { font-weight: 700; font-size: 17px; }
.brand-text small { display: block; font-weight: 400; color: var(--muted); font-size: 11px; letter-spacing: .03em; }
.nav { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.nav a { color: var(--muted); padding: 7px 11px; border-radius: 8px; font-size: 14px; font-weight: 500; }
.nav a:hover { color: var(--ink); background: #efede8; text-decoration: none; }
.nav a.active { color: var(--accent); background: var(--accent-soft); }
.nav-toggle { display: none; margin-left: auto; background: none; border: 1px solid var(--line); border-radius: 8px; font-size: 18px; padding: 4px 10px; cursor: pointer; }
#acctBtn { display: inline-block; margin-left: auto; }

/* account modal */
.modal-backdrop { position: fixed; inset: 0; background: rgba(15,18,22,.45); z-index: 80; display: flex; align-items: center; justify-content: center; padding: 20px; }
.modal { background: var(--card); border-radius: 16px; max-width: 480px; width: 100%; padding: 22px; box-shadow: 0 20px 60px rgba(0,0,0,.25); }
.modal h3 { margin: 0 0 8px; font-size: 18px; }
.modal .modal-row { display: flex; gap: 8px; margin: 12px 0; flex-wrap: wrap; }
.modal input { flex: 1 1 200px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 10px; font-size: 14px; }
.modal p { font-size: 13.5px; color: #444; }
@media (max-width: 860px) {
  .topbar-inner { flex-wrap: wrap; height: auto; padding: 8px 20px 0; gap: 8px; }
  .nav { display: flex; width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; gap: 2px; margin-left: 0; padding: 0 0 6px; flex-wrap: nowrap; scrollbar-width: none; border: none; background: transparent; }
  .nav::-webkit-scrollbar { display: none; }
  .nav a { flex: 0 0 auto; padding: 6px 10px; font-size: 13.5px; border-radius: 8px; }
  .nav-toggle { display: none; }
}

/* hero */
.hero { padding: 44px 0 18px; }
.hero h1 { font-family: var(--serif); font-size: clamp(28px, 4.2vw, 44px); margin: 0 0 8px; line-height: 1.22; }
.hero .lead { font-size: 17px; color: var(--muted); max-width: 720px; margin: 0 0 22px; }
.hero-search { display: flex; max-width: 560px; gap: 8px; }
.hero-search input { flex: 1; padding: 13px 16px; border: 1px solid var(--line); border-radius: 12px; font-size: 16px; background: var(--card); }
.hero-search button { padding: 13px 22px; border-radius: 12px; border: none; background: var(--accent); color: #fff; font-size: 15px; font-weight: 600; cursor: pointer; }
.hero-search button:hover { filter: brightness(1.08); }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; margin: 26px 0 6px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; box-shadow: var(--shadow); }
.stat .n { font-size: 30px; font-weight: 800; font-family: var(--serif); line-height: 1.1; }
.stat .l { font-size: 13px; color: var(--muted); margin-top: 2px; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin: 22px 0 30px; }
.feature { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); transition: transform .12s ease; display: block; color: var(--ink); }
.feature:hover { transform: translateY(-2px); text-decoration: none; }
.feature .ico { font-size: 26px; }
.feature h3 { margin: 8px 0 4px; font-size: 17px; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; }

/* shared section headings */
.section-title { display: flex; align-items: baseline; gap: 12px; margin: 34px 0 6px; }
.section-title h2 { font-family: var(--serif); font-size: 26px; margin: 0; }
.section-title .count { color: var(--muted); font-size: 14px; }
.section-sub { color: var(--muted); margin: 0 0 18px; font-size: 14px; }

/* toolbar / filters */
.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; margin: 16px 0; box-shadow: var(--shadow); }
.toolbar input[type=search] { flex: 1 1 220px; min-width: 180px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 10px; font-size: 14px; }
.chip { padding: 6px 12px; border-radius: 999px; border: 1px solid var(--line); background: #fff; font-size: 13px; cursor: pointer; color: var(--muted); user-select: none; }
.chip:hover { border-color: #c9c5bd; color: var(--ink); }
.chip.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.chip.star.on { background: var(--gold); border-color: var(--gold); }
select.fsel { padding: 8px 10px; border-radius: 10px; border: 1px solid var(--line); background: #fff; font-size: 13px; }
.toolbar .spacer { flex: 1; }
.btn { padding: 8px 16px; border-radius: 10px; border: 1px solid var(--line); background: #fff; cursor: pointer; font-size: 13px; font-weight: 600; color: var(--ink); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn:hover { filter: brightness(.97); }
.btn:disabled { opacity: .5; cursor: default; }

/* word cards */
.cards-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(246px, 1fr)); gap: 12px; margin: 8px 0 30px; }
.wcard { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; cursor: pointer; box-shadow: var(--shadow); transition: transform .1s ease, border-color .1s; }
.wcard:hover { transform: translateY(-2px); border-color: #cfcac2; }
.wcard .w { font-family: var(--serif); font-size: 20px; font-weight: 700; display: flex; justify-content: space-between; align-items: center; gap: 6px; }
.wtags { display: flex; align-items: center; gap: 6px; }
.favcard { border: none; background: none; cursor: pointer; font-size: 17px; line-height: 1; padding: 2px 3px; color: #c9b98a; border-radius: 6px; }
.favcard.on { color: var(--gold); }
.favcard:hover { transform: scale(1.15); background: #f5efe3; }
.wcard .ipa { color: var(--muted); font-size: 12px; font-family: var(--sans); }
.wcard .mz { font-size: 13.5px; margin-top: 6px; color: #333; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.wcard .meta { display: flex; gap: 5px; margin-top: 10px; flex-wrap: wrap; }
.badge { font-size: 11px; padding: 2px 8px; border-radius: 999px; background: #f0eee9; color: var(--muted); font-weight: 600; }
.badge.cefr { color: #fff; }
.badge.cefr.A1, .badge.cefr.A2 { background: #4c7a5a; }
.badge.cefr.B1, .badge.cefr.B2 { background: #2f5bd3; }
.badge.cefr.C1 { background: #7a4fd3; }
.badge.cefr.C2 { background: #a03bb8; }
.stars { color: var(--gold); letter-spacing: 1px; font-size: 13px; }
.stars .dim { color: #d8d2c4; }

/* empty state */
.empty { text-align: center; padding: 60px 20px; color: var(--muted); }
.empty .big { font-size: 44px; margin-bottom: 8px; }

/* drawer */
.drawer { position: fixed; inset: 0; z-index: 60; }
.drawer[hidden] { display: none; }
.drawer-backdrop { position: absolute; inset: 0; background: rgba(15,18,22,.38); }
.drawer-panel { position: absolute; top: 0; right: 0; height: 100%; width: min(560px, 94vw); background: var(--card); box-shadow: -10px 0 40px rgba(0,0,0,.15); overflow-y: auto; padding: 26px 26px 50px; }
.drawer-close { position: sticky; top: 0; float: right; background: #f0eee9; border: none; border-radius: 10px; font-size: 18px; width: 36px; height: 36px; cursor: pointer; }
.drawer-panel h2 { font-family: var(--serif); font-size: 32px; margin: 4px 0 2px; }
.drawer-panel .ipa { color: var(--muted); }
.dsection { margin-top: 22px; }
.dsection h4 { margin: 0 0 8px; font-size: 14px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.pos-row { display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0 4px; }
.pos-chip { background: var(--accent-soft); color: var(--accent); font-size: 13px; font-weight: 600; padding: 3px 10px; border-radius: 8px; }
.def-row { padding: 10px 12px; background: #faf9f6; border: 1px solid var(--line); border-radius: 10px; margin-bottom: 8px; }
.def-row .en { font-weight: 600; }
.def-row .zh { color: #444; margin-top: 2px; }
.def-row .src { font-size: 11px; color: var(--muted); margin-top: 4px; }
.usage-list { margin: 0; padding-left: 18px; }
.usage-list li { margin-bottom: 6px; }
.ex-row { padding: 10px 12px; border-left: 3px solid var(--accent); background: #fbfaf7; border-radius: 0 10px 10px 0; margin-bottom: 8px; }
.ex-row .en { font-style: italic; }
.ex-row .zh { color: #555; font-size: 13.5px; margin-top: 3px; }
.ex-row .src { font-size: 11px; color: var(--muted); margin-top: 4px; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag { background: #f0eee9; border-radius: 999px; padding: 3px 10px; font-size: 12px; color: #555; }
.tag em { font-style: normal; color: var(--accent); font-size: 11px; margin-left: 2px; }
.formtag { cursor: pointer; border: 1px solid transparent; }
.formtag:hover { border-color: var(--accent); background: var(--accent-soft); }
.fav-btn { margin-top: 18px; }
.fav-btn.on { background: var(--gold); border-color: var(--gold); color: #fff; }

/* topics view */
.topic-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 10px; margin: 18px 0 30px; }
.topic-card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.topic-card:hover { border-color: var(--accent); }
.topic-card .t { font-weight: 600; font-size: 14px; }
.topic-card .c { color: var(--muted); font-size: 13px; }

/* flashcard */
.flash-stage { display: flex; flex-direction: column; align-items: center; gap: 18px; margin: 30px 0; }
.flash-card { width: min(560px, 100%); min-height: 300px; background: var(--card); border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow); display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 34px 30px; text-align: center; cursor: pointer; transition: transform .15s; }
.flash-card:hover { transform: scale(1.01); }
.flash-word { font-family: var(--serif); font-size: clamp(32px, 6vw, 52px); font-weight: 800; }
.flash-ipa { color: var(--muted); margin-top: 4px; }
.flash-hint { color: var(--muted); margin-top: 22px; font-size: 13px; }
.flash-back { text-align: left; width: 100%; font-size: 15px; }
.flash-back .row { margin-bottom: 10px; }
.flash-actions { display: flex; gap: 12px; }
.flash-actions .btn { padding: 10px 26px; font-size: 15px; border-radius: 12px; }
.btn.green { background: var(--green); border-color: var(--green); color: #fff; }
.btn.red { background: #f3efec; border-color: #e2cdc9; color: var(--red); }
.flash-stats { color: var(--muted); font-size: 13px; }

/* quiz */
.quiz-box { max-width: 640px; margin: 26px auto; background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 26px; box-shadow: var(--shadow); }
.quiz-progress { font-size: 13px; color: var(--muted); display: flex; justify-content: space-between; margin-bottom: 10px; }
.quiz-q { font-size: 19px; margin: 8px 0 18px; }
.quiz-q .qword { font-family: var(--serif); font-size: 30px; font-weight: 800; display: block; margin-bottom: 6px; }
.quiz-opt { display: block; width: 100%; text-align: left; padding: 13px 16px; margin-bottom: 8px; border: 1px solid var(--line); border-radius: 12px; background: #fff; font-size: 15px; cursor: pointer; }
.quiz-opt:hover:not(:disabled) { border-color: var(--accent); background: var(--accent-soft); }
.quiz-opt.correct { border-color: var(--green); background: #eaf5ee; }
.quiz-opt.wrong { border-color: var(--red); background: #fbeeec; }
.quiz-feedback { margin-top: 12px; font-size: 14px; }
.quiz-bar { display: flex; gap: 8px; margin-top: 16px; }
.quiz-done { text-align: center; padding: 20px 0; }
.quiz-done .score { font-size: 46px; font-weight: 800; font-family: var(--serif); }

/* resources */
.resource-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; margin: 18px 0 40px; }
.resource { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); display: flex; flex-direction: column; }
.resource h3 { margin: 0 0 4px; font-size: 17px; }
.resource .sub { color: var(--muted); font-size: 12.5px; margin-bottom: 10px; }
.resource p { font-size: 13.5px; color: #444; margin: 0 0 12px; flex: 1; }
.resource .btns { display: flex; flex-wrap: wrap; gap: 8px; }
.resource .btn { font-size: 12.5px; }
.note { background: #fbf7e9; border: 1px solid #eddfb6; border-radius: 12px; padding: 14px 16px; font-size: 13.5px; color: #6b5a2a; margin: 16px 0; }

/* detail page blocks */
.kv { display: grid; grid-template-columns: 130px 1fr; gap: 6px 10px; font-size: 14px; }
.kv dt { color: var(--muted); }

.lan-card { display: flex; gap: 18px; align-items: center; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; box-shadow: var(--shadow); margin: 20px 0 4px; }
.lan-card img { width: 120px; height: 120px; border-radius: 10px; flex: 0 0 auto; }
.lan-card h3 { margin: 0 0 4px; font-size: 16px; }
.lan-card p { margin: 2px 0; font-size: 13.5px; }
.lan-card b { font-family: Consolas, monospace; }

/* ---- skills page ---- */
.sk-list { display: flex; flex-direction: column; gap: 12px; margin: 16px 0 40px; }
.sk-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.sk-card.open { border-color: #cfcac2; }
.sk-head { display: flex; justify-content: space-between; align-items: center; padding: 16px 18px; cursor: pointer; gap: 10px; }
.sk-head:hover { background: #faf9f6; }
.sk-title { font-weight: 700; font-size: 16px; margin-right: 8px; }
.sk-arrow { color: var(--muted); font-size: 14px; }
.sk-body { padding: 4px 18px 20px; }
.sk-body h4 { margin: 18px 0 8px; font-size: 14px; letter-spacing: .04em; color: var(--muted); }
.sk-question { background: #faf9f6; border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; font-size: 15.5px; line-height: 1.7; }
.sk-notes { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 10px; margin-top: 10px; }
.sk-notes div { background: #f7f9fd; border: 1px solid #e3e9f6; border-radius: 10px; padding: 10px 12px; }
.sk-notes b { font-size: 13px; color: var(--accent); }
.sk-notes p { margin: 4px 0 0; font-size: 13.5px; color: #444; }
.sk-chart { width: 100%; max-width: 760px; border: 1px solid var(--line); border-radius: 10px; background: #fff; display: block; margin: 0 0 6px; }
.sk-bands { display: flex; gap: 8px; margin: 4px 0 10px; flex-wrap: wrap; align-items: center; }
.sk-bandbtn.on { background: var(--accent); color: #fff; border-color: var(--accent); }
.sk-sdiv { width: 1px; height: 24px; background: var(--line); margin: 0 4px; }
.sk-sbtn.on { background: var(--ink); color: #fff; border-color: var(--ink); }
.sk-kp { margin-top: 12px; font-size: 13.5px; }
.sk-kp > b { display: block; margin-bottom: 6px; color: var(--muted); font-size: 13px; }
.sk-tags .tag { background: #eef2fc; color: #2f4f9e; border: 1px solid #dfe7fa; }
.sk-sample { max-height: 520px; }
.sk-sample { background: #fbfaf7; border-left: 3px solid var(--accent); border-radius: 0 10px 10px 0; padding: 14px 16px; font-size: 15px; line-height: 1.75; max-height: 440px; overflow-y: auto; }
.sk-sample p { margin: 0 0 10px; }
.sk-whybox { margin-top: 10px; background: #fbf7e9; border: 1px solid #eddfb6; border-radius: 10px; padding: 10px 14px; font-size: 13.5px; color: #6b5a2a; }
.sk-why { margin: 8px 0 0; padding-left: 18px; }
.sk-src { margin-top: 12px; font-size: 12.5px; color: var(--muted); }

/* footer */
.footer { border-top: 1px solid var(--line); margin-top: 40px; padding: 24px 0 40px; font-size: 12.5px; color: var(--muted); }
.footer p { margin: 2px 0; }

/* ---- library: tabs / letters / pager ---- */
.tabs { display: flex; gap: 8px; margin: 16px 0 0; flex-wrap: wrap; }
.tab { padding: 9px 18px; border-radius: 12px; border: 1px solid var(--line); background: #efece6; cursor: pointer; font-weight: 700; color: var(--muted); font-size: 14.5px; }
.tab:hover { color: var(--ink); }
.tab.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.tab .tabn { font-weight: 500; font-size: 12.5px; opacity: .8; }
.letters { display: flex; flex-wrap: wrap; gap: 4px; margin: 14px 0 2px; }
.letter { padding: 5px 10px; border-radius: 8px; font-weight: 700; font-size: 13px; cursor: pointer; color: var(--muted); min-width: 30px; text-align: center; user-select: none; }
.letter:hover { background: #efede8; color: var(--ink); }
.letter.on { background: var(--ink); color: #fff; }
.chiprow { display: flex; gap: 8px; flex-wrap: wrap; margin: 4px 0 6px; }
.pager { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 14px 0; padding: 10px 12px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; }
.pginfo { font-size: 13.5px; color: var(--muted); }
.pginput { width: 66px; padding: 6px 8px; border: 1px solid var(--line); border-radius: 8px; text-align: center; font-size: 14px; }
.pgsize { margin-left: auto; }
.wcard.active { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-soft), var(--shadow); }

/* ---- drawer: nav / highlight / bigger text ---- */
.dnav { display: flex; align-items: center; gap: 10px; margin: 0 42px 6px 0; flex-wrap: wrap; }
.dnav .btn { font-size: 13px; padding: 6px 12px; }
.dmeaning { font-size: 19px; font-weight: 600; line-height: 1.5; }
mark.hl { background: #ffe08a; color: #5a3d00; border-radius: 3px; padding: 0 2px; font-weight: 700; }
.src-link { font-size: 12px; color: var(--accent); }
.src-links { font-weight: 400; font-size: 12px; margin-left: 8px; letter-spacing: 0; text-transform: none; }
.hl-note { font-weight: 400; font-size: 12px; color: var(--muted); letter-spacing: 0; text-transform: none; }

/* enlarged detail content */
.drawer-panel { font-size: 16.5px; }
.drawer-panel h2 { font-size: 38px; letter-spacing: -.01em; }
.drawer-panel .ipa { font-size: 16px; }
.drawer-panel .pos-chip { font-size: 14px; padding: 4px 12px; }
.drawer-panel .dsection { margin-top: 24px; }
.drawer-panel .dsection h4 { font-size: 14px; }
.drawer-panel .def-row { padding: 12px 14px; }
.drawer-panel .def-row .en { font-size: 17px; }
.drawer-panel .def-row .zh { font-size: 15.5px; }
.drawer-panel .def-row .src { font-size: 12.5px; }
.drawer-panel .usage-list li { font-size: 15.5px; margin-bottom: 8px; line-height: 1.65; }
.drawer-panel .ex-row { padding: 12px 14px; }
.drawer-panel .ex-row .en { font-size: 17.5px; line-height: 1.7; }
.drawer-panel .ex-row .zh { font-size: 15.5px; }
.drawer-panel .ex-row .src { font-size: 12.5px; margin-top: 6px; }
.drawer-panel .kv { font-size: 15px; }
.drawer-panel .kv dt { font-size: 14px; }
.drawer-panel .tag { font-size: 13px; padding: 4px 11px; }
.drawer-panel .fav-btn { font-size: 15px; padding: 10px 20px; }