:root {
  --bg: #0b0e14; --panel: #151a23; --panel2: #1b2130; --border: #242d3f;
  --text: #e6ebf4; --muted: #8b96ab; --green: #34d399; --cyan: #22d3ee;
  --red: #f87171; --amber: #fbbf24; --violet: #a78bfa;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: var(--bg); color: var(--text); min-height: 100vh;
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
}
header {
  display: flex; align-items: center; gap: 28px; padding: 0 28px; height: 58px;
  background: rgba(21,26,35,.9); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; backdrop-filter: blur(8px); z-index: 10;
}
.logo { font-size: 21px; font-weight: 800; letter-spacing: 1px; color: var(--green); }
.logo .sub { font-size: 11px; color: var(--muted); font-weight: 500; margin-left: 8px; letter-spacing: 2px; }
nav { display: flex; gap: 6px; flex: 1; }
nav a {
  color: var(--muted); text-decoration: none; padding: 7px 16px; border-radius: 9px;
  font-weight: 600; font-size: 14.5px;
}
nav a:hover { color: var(--text); background: var(--panel2); }
nav a.on { color: #06120c; background: var(--green); }
.topstats { display: flex; gap: 14px; font-size: 14px; color: var(--muted); font-weight: 600; }
.topstats b { color: var(--amber); }
main { max-width: 1060px; margin: 0 auto; padding: 26px 22px 60px; }

h2.page-title { font-size: 20px; margin-bottom: 18px; }
.muted { color: var(--muted); }
.small { font-size: 12.5px; }

.card { background: var(--panel); border: 1px solid var(--border); border-radius: 16px; padding: 20px; }
.row { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  border: 1px solid var(--border); background: var(--panel2); color: var(--text);
  padding: 9px 18px; border-radius: 11px; cursor: pointer; font-size: 14.5px; font-weight: 600;
  font-family: inherit;
}
.btn:hover { border-color: var(--green); }
.btn.primary { background: var(--green); color: #06120c; border-color: var(--green); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.boost { background: rgba(34,211,238,.12); color: var(--cyan); border-color: rgba(34,211,238,.5); }
.btn.boost:hover { border-color: var(--cyan); }
.break-card .break-timer { font-size: 46px; font-weight: 800; color: var(--cyan); margin: 10px 0 16px; font-variant-numeric: tabular-nums; }
.btn.danger { color: var(--red); }
.btn:disabled { opacity: .45; cursor: default; }
input[type=text], input[type=password], input[type=number], textarea, select {
  background: var(--bg); color: var(--text); border: 1px solid var(--border);
  border-radius: 10px; padding: 10px 12px; font-size: 14.5px; font-family: inherit; outline: none;
}
input[type=text]:focus, input[type=password]:focus, input[type=number]:focus, textarea:focus { border-color: var(--cyan); }
textarea { width: 100%; min-height: 150px; resize: vertical; line-height: 1.6; }

/* ---------- 首页 ---------- */
.hero { display: flex; gap: 22px; align-items: center; }
.ring {
  width: 128px; height: 128px; border-radius: 50%; flex-shrink: 0;
  display: grid; place-items: center; position: relative;
}
.ring::before {
  content: ""; position: absolute; inset: 9px; border-radius: 50%; background: var(--panel);
}
.ring .inner { position: relative; text-align: center; }
.ring .inner .lv { font-size: 12px; color: var(--muted); }
.ring .inner .num { font-size: 30px; font-weight: 800; color: var(--green); }
.hero-info { flex: 1; }
.hero-info h1 { font-size: 22px; margin-bottom: 4px; }
.taskbar { margin: 10px 0 4px; }
.taskbar .lab { display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); margin-bottom: 5px; }
.taskbar .track { height: 9px; border-radius: 5px; background: var(--panel2); overflow: hidden; }
.taskbar .fill { height: 100%; border-radius: 5px; background: linear-gradient(90deg, var(--green), var(--cyan)); transition: width .4s; }
.taskbar.done .fill { background: var(--green); }
.big-cta { margin-top: 16px; display: inline-flex; align-items: center; gap: 10px; font-size: 16px; padding: 13px 30px; }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 18px; }
.stat-cell { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 15px 17px; }
.stat-cell .v { font-size: 25px; font-weight: 800; }
.stat-cell .k { font-size: 12.5px; color: var(--muted); margin-top: 3px; }
.pack-list { margin-top: 18px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.pack-item { display: flex; align-items: center; gap: 12px; background: var(--panel); border: 1px solid var(--border); border-radius: 13px; padding: 13px 16px; }
.pack-item .nm { width: 120px; font-size: 13.5px; font-weight: 600; flex-shrink: 0; }
.pack-item .bar { flex: 1; height: 8px; background: var(--panel2); border-radius: 4px; overflow: hidden; display: flex; }
.pack-item .bar i { display: block; height: 100%; }
.pack-item .bar i.ok { background: var(--green); }
.pack-item .bar i.known { background: rgba(34,211,238,.45); }
.pack-item .ct { font-size: 12px; color: var(--muted); width: 64px; text-align: right; flex-shrink: 0; }

/* ---------- 学习 ---------- */
#study-wrap { max-width: 720px; margin: 0 auto; }
.session-top { display: flex; align-items: center; gap: 14px; margin-bottom: 20px; }
.session-top .track { flex: 1; height: 10px; border-radius: 5px; background: var(--panel2); overflow: hidden; }
.session-top .fill { height: 100%; background: linear-gradient(90deg, var(--green), var(--cyan)); transition: width .3s; }
.session-top .cnt { font-size: 13px; color: var(--muted); font-weight: 600; white-space: nowrap; }
.quit { color: var(--muted); font-size: 13px; background: none; border: none; cursor: pointer; }
.quit:hover { color: var(--red); }

.q-card { background: var(--panel); border: 1px solid var(--border); border-radius: 20px; padding: 34px 30px; text-align: center; }
.q-mode { font-size: 12.5px; color: var(--cyan); letter-spacing: 3px; font-weight: 700; margin-bottom: 18px; }
.q-word { font-size: 52px; font-weight: 800; letter-spacing: 1px; line-height: 1.15; font-family: Georgia, "Times New Roman", serif; }
.q-phon { color: var(--muted); font-size: 17px; margin-top: 6px; }
.q-trans { font-size: 24px; font-weight: 700; margin-top: 10px; line-height: 1.5; }
.q-example { color: var(--muted); font-size: 15px; margin-top: 16px; line-height: 1.7; }
.q-example.sub { margin-top: 8px; font-size: 12.5px; opacity: .8; }
.q-example b { color: var(--text); }
.audio-btn { background: none; border: 1px solid var(--border); color: var(--cyan); border-radius: 50%; width: 42px; height: 42px; font-size: 18px; cursor: pointer; margin-top: 16px; }
.audio-btn:hover { border-color: var(--cyan); }

.opts { display: grid; gap: 10px; margin-top: 26px; }
.opt {
  display: flex; align-items: center; gap: 14px; text-align: left;
  background: var(--panel2); border: 1.5px solid var(--border); border-radius: 13px;
  padding: 13px 16px; cursor: pointer; color: var(--text); font-size: 16px; font-family: inherit;
}
.opt:hover { border-color: var(--cyan); }
.opt span:last-child { line-height: 1.45; word-break: break-word; }
.opt .key {
  width: 24px; height: 24px; border-radius: 6px; background: var(--bg); border: 1px solid var(--border);
  display: grid; place-items: center; font-size: 12px; color: var(--muted); flex-shrink: 0;
}
.opt.right { border-color: var(--green); background: rgba(52,211,153,.12); }
.opt.right .key { background: var(--green); color: #06120c; border-color: var(--green); }
.opt.wrong { border-color: var(--red); background: rgba(248,113,113,.10); }
.opt.dim { opacity: .5; }

.spell-box { display: flex; gap: 10px; justify-content: center; margin-top: 26px; }
.spell-box input { font-size: 20px; text-align: center; letter-spacing: 2px; width: 260px; }
.feedback { border-radius: 14px; padding: 15px 18px; margin-top: 22px; text-align: left; }
.feedback.ok { background: rgba(52,211,153,.10); border: 1px solid var(--green); }
.feedback.no { background: rgba(248,113,113,.08); border: 1px solid var(--red); }
.feedback .verdict { font-weight: 800; font-size: 16px; margin-bottom: 6px; }
.feedback.ok .verdict { color: var(--green); }
.feedback.no .verdict { color: var(--red); }
.feedback .ans { font-size: 15px; line-height: 1.6; }

.session-end { text-align: center; padding: 46px 30px; }
.session-end .emoji { font-size: 54px; }
.session-end h2 { margin: 14px 0 8px; font-size: 24px; }
.session-end .nums { display: flex; justify-content: center; gap: 34px; margin: 22px 0; }
.session-end .nums .v { font-size: 28px; font-weight: 800; color: var(--cyan); }
.session-end .nums .k { font-size: 12.5px; color: var(--muted); }

/* ---------- 试卷页 ---------- */
.cand-list { margin-top: 14px; max-height: 460px; overflow-y: auto; border: 1px solid var(--border); border-radius: 13px; }
.cand {
  display: flex; gap: 13px; align-items: flex-start; padding: 12px 15px;
  border-bottom: 1px solid var(--border); cursor: pointer;
}
.cand:last-child { border-bottom: none; }
.cand:hover { background: var(--panel2); }
.cand.off { opacity: .38; }
.cand .wd { min-width: 150px; font-weight: 700; font-size: 15.5px; font-family: Georgia, serif; }
.cand .wd .ph { display: block; font-size: 12px; color: var(--muted); font-family: inherit; font-weight: 400; }
.cand .tr { flex: 1; font-size: 13.5px; color: var(--text); line-height: 1.5; }
.cand .ex { color: var(--muted); font-size: 12.5px; margin-top: 3px; font-style: italic; }
.cand .freq { font-size: 11px; color: var(--amber); border: 1px solid var(--amber); padding: 1px 7px; border-radius: 20px; white-space: nowrap; }
.texts-table { width: 100%; border-collapse: collapse; margin-top: 6px; }
.texts-table td, .texts-table th { padding: 11px 12px; border-bottom: 1px solid var(--border); text-align: left; font-size: 14px; }
.texts-table th { color: var(--muted); font-weight: 600; font-size: 12.5px; }

/* ---------- 词库页 ---------- */
.filters { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; }
.wtable { width: 100%; border-collapse: collapse; }
.wtable td { padding: 11px 10px; border-bottom: 1px solid var(--border); font-size: 14px; vertical-align: top; }
.wtable .w { font-weight: 700; font-size: 15.5px; font-family: Georgia, serif; cursor: pointer; }
.wtable .ph { color: var(--muted); font-size: 12px; display: block; font-family: inherit; }
.wtable .tr { color: var(--text); max-width: 330px; line-height: 1.5; }
.wtable .tag { font-size: 11px; color: var(--violet); border: 1px solid rgba(167,139,250,.4); border-radius: 20px; padding: 1px 8px; white-space: nowrap; }
.chip { font-size: 11px; padding: 2px 9px; border-radius: 20px; font-weight: 600; white-space: nowrap; }
.chip.new { color: var(--cyan); background: rgba(34,211,238,.1); }
.chip.learning { color: var(--amber); background: rgba(251,191,36,.1); }
.chip.mastered { color: var(--green); background: rgba(52,211,153,.1); }
.chip.ignored { color: var(--muted); background: var(--panel2); }
.mini { background: none; border: 1px solid var(--border); color: var(--muted); border-radius: 8px; padding: 4px 9px; cursor: pointer; font-size: 12px; font-family: inherit; }
.mini:hover { color: var(--text); border-color: var(--cyan); }
.pager { display: flex; gap: 8px; align-items: center; justify-content: center; margin-top: 18px; }

/* ---------- 数据页 ---------- */
.chart { display: flex; align-items: flex-end; gap: 6px; height: 150px; padding: 10px 4px 0; }
.chart .col { flex: 1; display: flex; flex-direction: column; justify-content: flex-end; align-items: center; gap: 5px; height: 100%; }
.chart .col i { width: 100%; max-width: 30px; border-radius: 5px 5px 0 0; background: linear-gradient(180deg, var(--cyan), var(--green)); min-height: 2px; }
.chart .col .d { font-size: 10px; color: var(--muted); }
.chart .col .n { font-size: 10.5px; color: var(--cyan); }
.section { margin-top: 20px; }
.section h3 { font-size: 15.5px; margin-bottom: 12px; color: var(--text); }
.empty { text-align: center; color: var(--muted); padding: 40px 0; }

.toast {
  position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--panel2); border: 1px solid var(--green); color: var(--text);
  padding: 11px 22px; border-radius: 12px; font-size: 14px; opacity: 0; pointer-events: none;
  transition: all .25s; z-index: 99;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- SVG 图标 ---------- */
.ic {
  width: 1.05em; height: 1.05em; vertical-align: -0.18em;
  fill: none; stroke: currentColor; stroke-width: 2;
  stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0;
}
button .ic { pointer-events: none; }

/* ---------- 登录 / 注册 ---------- */
.auth-box { max-width: 380px; margin: 9vh auto 0; background: var(--panel); border: 1px solid var(--border); border-radius: 18px; padding: 28px 26px 22px; }
.auth-tabs { display: flex; gap: 6px; margin-bottom: 16px; }
.auth-tabs button { flex: 1; background: var(--panel2); border: 1px solid var(--border); color: var(--muted); padding: 9px 0; border-radius: 10px; cursor: pointer; font-weight: 600; font-family: inherit; font-size: 14.5px; }
.auth-tabs button.on { background: var(--green); color: #06120c; border-color: var(--green); }
.auth-box input { width: 100%; margin-bottom: 10px; }
.auth-err { min-height: 20px; color: var(--red); font-size: 13px; margin-bottom: 4px; text-align: center; }

/* ---------- 拼写训练 ---------- */
.q-chunks { color: var(--cyan); font-size: 15px; letter-spacing: 2px; margin-top: 4px; font-family: Georgia, serif; }
.built {
  display: inline-block; min-width: 220px; min-height: 50px; margin: 18px 0 12px;
  font-size: 26px; font-family: Georgia, serif; letter-spacing: 6px; padding: 4px 16px;
  border-bottom: 2px dashed var(--border); cursor: pointer;
}
.built:hover { border-color: var(--cyan); }
.chips { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin-top: 4px; }
.chip-l {
  width: 44px; height: 48px; font-size: 20px; font-family: Georgia, serif;
  background: var(--panel2); color: var(--text); border: 1.5px solid var(--border);
  border-radius: 10px; cursor: pointer; transition: transform .1s;
}
.chip-l:hover:not(:disabled) { border-color: var(--cyan); transform: translateY(-2px); }
.chip-l:disabled { opacity: .22; }

/* ---------- 手机端适配 ---------- */
@media (max-width: 760px) {
  header { height: auto; padding: 9px 12px; flex-wrap: wrap; gap: 8px 12px; }
  .logo { font-size: 18px; }
  .logo .sub { display: none; }
  .topstats { margin-left: auto; font-size: 12.5px; gap: 8px; }
  nav { order: 3; flex: 0 0 100%; width: 100%; overflow-x: auto; gap: 3px; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
  nav::-webkit-scrollbar { display: none; }
  nav a { padding: 7px 13px; font-size: 14px; white-space: nowrap; }
  main { padding: 14px 12px 50px; }
  h2.page-title { font-size: 18px; }
  .card { padding: 15px 13px; border-radius: 13px; }
  .hero { flex-direction: column; align-items: stretch; text-align: center; gap: 14px; }
  .ring { margin: 0 auto; width: 112px; height: 112px; }
  .hero-info h1 { font-size: 19px; }
  .taskbar .lab { font-size: 12.5px; }
  .hero-info > div[style*="display:flex"] { flex-direction: column; }
  .big-cta { width: 100%; margin-top: 6px; font-size: 15.5px; padding: 13px 16px; }
  .stat-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .stat-cell { padding: 12px 13px; }
  .stat-cell .v { font-size: 21px; }
  .pack-list { grid-template-columns: 1fr; gap: 8px; }
  .pack-item { padding: 10px 12px; }
  .pack-item .nm { width: 96px; font-size: 12.5px; }
  /* 学习卡 */
  .session-top { gap: 8px; margin-bottom: 12px; }
  .session-top .cnt { font-size: 12px; }
  .q-card { padding: 22px 14px; border-radius: 16px; }
  .q-word { font-size: 36px; }
  .q-trans { font-size: 19px; }
  .q-example { font-size: 14px; margin-top: 12px; }
  .opts { gap: 8px; margin-top: 18px; }
  .opt { padding: 13px 12px; font-size: 15px; }
  .opt .key { display: none; }
  .spell-box { flex-direction: column; align-items: stretch; }
  .spell-box input { width: 100%; }
  .chips { gap: 6px; }
  .chip-l { width: 38px; height: 44px; font-size: 18px; }
  .built { min-width: 0; width: 100%; font-size: 22px; letter-spacing: 4px; }
  .session-end { padding: 30px 16px; }
  .session-end .nums { gap: 16px; flex-wrap: wrap; }
  .feedback .corr { flex-wrap: wrap; }
  /* 试卷 / 词库 / 数据 */
  textarea { min-height: 120px; }
  .cand { flex-direction: column; gap: 4px; padding: 10px 12px; }
  .cand .wd { min-width: 0; }
  .cand .freq { align-self: flex-start; }
  .filters select, .filters input[type=text] { flex: 1 1 40%; min-width: 0; }
  .card[style*="padding:6px 14px"] { overflow-x: auto; }
  .wtable td { padding: 9px 6px; font-size: 13px; }
  .wtable .tr { max-width: none; }
  .texts-table td, .texts-table th { padding: 8px 6px; font-size: 13px; }
  .chart { height: 120px; gap: 3px; }
  .chart .col .d { font-size: 8.5px; }
  /* 打印页：手机上只做预览，横向滚动 */
  .print-controls > div { gap: 8px; }
  #sheets { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .sheet { margin-left: 0; }
}