:root {
  --paper: #eae6db;
  --paper-raised: #f7f4ea;
  --ink: #2b2622;
  --ink-muted: #7a7060;
  --rule: #cfc5ac;
  --seal: #a3392a;
  --seal-soft: #ecdad2;
  --jade: #3f6e54;
  --jade-soft: #dfe9de;
  --radius-sm: 4px;
  --radius-md: 6px;

  --font-hanzi: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "Courier New", monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1c1a16;
    --paper-raised: #262319;
    --ink: #ece5d4;
    --ink-muted: #a49a86;
    --rule: #3c3728;
    --seal: #d97a56;
    --seal-soft: #3a2a20;
    --jade: #7fb894;
    --jade-soft: #223228;
  }
}
:root[data-theme="dark"] {
  --paper: #1c1a16; --paper-raised: #262319; --ink: #ece5d4; --ink-muted: #a49a86;
  --rule: #3c3728; --seal: #d97a56; --seal-soft: #3a2a20; --jade: #7fb894; --jade-soft: #223228;
}
:root[data-theme="light"] {
  --paper: #eae6db; --paper-raised: #f7f4ea; --ink: #2b2622; --ink-muted: #7a7060;
  --rule: #cfc5ac; --seal: #a3392a; --seal-soft: #ecdad2; --jade: #3f6e54; --jade-soft: #dfe9de;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--paper); color: var(--ink); font-family: var(--font-sans); }
body { overflow-x: hidden; }
button, input { font-family: inherit; }
:focus-visible { outline: 2px solid var(--seal); outline-offset: 2px; }

/* ---- Login gate ---- */
.login-gate {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.login-box {
  width: 100%;
  max-width: 340px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--paper-raised);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  padding: 28px;
}
.login-brand {
  font-family: var(--font-hanzi);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.login-brand span {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
}
.login-box label { font-size: 0.78rem; color: var(--ink-muted); font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.04em; }
.login-box input {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--rule);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-mono);
}
.login-box button {
  margin-top: 6px;
  border: 1.5px solid var(--seal);
  background: var(--seal);
  color: var(--paper-raised);
  padding: 11px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  cursor: pointer;
}
.login-error { color: var(--seal); font-size: 0.82rem; min-height: 1.2em; }

/* ---- Topbar ---- */
.topbar {
  padding: 18px 24px;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar-row { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.brand { font-family: var(--font-hanzi); font-size: 1.5rem; font-weight: 700; display: flex; align-items: baseline; gap: 10px; }
.brand span { font-family: var(--font-mono); font-size: 0.62rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-muted); }

#app { max-width: 1100px; margin: 0 auto; padding: 22px 24px 60px; }

/* ---- Toolbar ---- */
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-bottom: 16px; }
.level-switch { display: flex; gap: 3px; border: 1px solid var(--rule); border-radius: var(--radius-md); padding: 3px; }
.level-btn {
  border: none; background: transparent; color: var(--ink-muted);
  font-family: var(--font-mono); font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.04em; padding: 7px 12px; border-radius: 3px; cursor: pointer;
}
.level-btn:hover { color: var(--ink); }
.level-btn.active { background: var(--seal); color: var(--paper-raised); }

#searchBox {
  flex: 1; min-width: 180px; padding: 10px 13px; border-radius: var(--radius-sm);
  border: 1px solid var(--rule); background: var(--paper-raised); color: var(--ink); font-size: 0.9rem;
}
#searchBox:focus { outline: 2px solid var(--seal); outline-offset: -1px; }

.count-badge { font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-muted); white-space: nowrap; }
.toolbar-actions { display: flex; gap: 8px; }

.btn-primary, .btn-secondary, .btn-danger {
  border-radius: var(--radius-sm); font-family: var(--font-mono); font-size: 0.76rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.03em; padding: 9px 16px; cursor: pointer;
}
.btn-primary { border: 1.5px solid var(--seal); background: var(--seal); color: var(--paper-raised); }
.btn-primary:hover { filter: brightness(1.06); }
.btn-secondary { border: 1px solid var(--rule); background: var(--paper-raised); color: var(--ink); }
.btn-secondary:hover { border-color: var(--seal); color: var(--seal); }
.btn-danger { border: 1.5px solid var(--seal); background: none; color: var(--seal); margin-right: auto; }
.btn-danger:hover { background: var(--seal-soft); }

/* ---- Table ---- */
.table-wrap { overflow-x: auto; border: 1px solid var(--rule); border-radius: var(--radius-md); background: var(--paper-raised); }
.word-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.word-table th {
  text-align: left; font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase;
  letter-spacing: 0.04em; color: var(--ink-muted); padding: 10px 14px; border-bottom: 1px solid var(--rule);
  white-space: nowrap;
}
.word-table td { padding: 10px 14px; border-bottom: 1px solid var(--rule); vertical-align: top; }
.word-table tbody tr:hover { background: rgba(163, 57, 42, 0.05); cursor: pointer; }
.word-table tbody tr:last-child td { border-bottom: none; }
.cell-hanzi { font-family: var(--font-hanzi); font-size: 1.1rem; font-weight: 700; }
.cell-pinyin { font-family: var(--font-mono); color: var(--seal); white-space: nowrap; }
.cell-level {
  font-family: var(--font-mono); font-size: 0.68rem; font-weight: 700; color: var(--seal);
  border: 1px solid var(--seal); padding: 1px 6px; border-radius: 3px; white-space: nowrap;
}
.cell-edit { text-align: right; white-space: nowrap; }
.row-edit-btn {
  border: 1px solid var(--rule); background: var(--paper); color: var(--ink-muted);
  font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase; padding: 4px 10px;
  border-radius: 3px; cursor: pointer;
}
.row-edit-btn:hover { border-color: var(--seal); color: var(--seal); }

.empty-state { text-align: center; padding: 40px 20px; color: var(--ink-muted); }

/* ---- Modal ---- */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(20, 16, 12, 0.55);
  display: flex; align-items: flex-start; justify-content: center; padding: 40px 16px;
  overflow-y: auto; z-index: 100;
}
.modal-overlay[hidden] { display: none; }
.modal {
  width: 100%; max-width: 480px; background: var(--paper-raised); border: 1px solid var(--rule);
  border-radius: var(--radius-md); padding: 22px 24px 26px;
}
.modal-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.modal-head h2 { font-family: var(--font-hanzi); font-size: 1.15rem; margin: 0; }
.modal-close { border: none; background: none; font-size: 1.4rem; line-height: 1; color: var(--ink-muted); cursor: pointer; }
.modal-close:hover { color: var(--seal); }

.word-form { display: flex; flex-direction: column; gap: 10px; }
.form-row { display: flex; flex-direction: column; gap: 4px; }
.form-row label { font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink-muted); }
.form-row input {
  padding: 9px 11px; border-radius: var(--radius-sm); border: 1px solid var(--rule);
  background: var(--paper); color: var(--ink); font-size: 0.9rem;
}
.form-row input:focus { outline: 2px solid var(--seal); outline-offset: -1px; }
.form-divider {
  margin-top: 6px; padding-top: 10px; border-top: 1px dashed var(--rule);
  font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink-muted);
}
.form-error { color: var(--seal); font-size: 0.82rem; min-height: 1.2em; }
.modal-actions { display: flex; align-items: center; margin-top: 6px; }

/* ---- Import modal ---- */
.import-body { display: flex; flex-direction: column; gap: 12px; }
.import-body p { font-size: 0.86rem; color: var(--ink-muted); line-height: 1.5; margin: 0; }
.template-link { font-family: var(--font-mono); font-size: 0.8rem; color: var(--seal); text-decoration: underline; }
.file-drop {
  display: flex; align-items: center; justify-content: center; text-align: center;
  border: 1.5px dashed var(--rule); border-radius: var(--radius-md); padding: 22px;
  font-size: 0.86rem; color: var(--ink-muted); cursor: pointer;
}
.file-drop:hover { border-color: var(--seal); color: var(--seal); }
.file-drop input { display: none; }
.import-result { font-size: 0.86rem; line-height: 1.6; }
.import-result .ok { color: var(--jade); font-weight: 700; }
.import-result .bad { color: var(--seal); font-weight: 700; }
.import-result ul { margin: 6px 0 0; padding-left: 18px; color: var(--ink-muted); max-height: 140px; overflow-y: auto; }

@media (max-width: 620px) {
  .toolbar { flex-direction: column; align-items: stretch; }
  .toolbar-actions { justify-content: stretch; }
  .toolbar-actions button { flex: 1; }
}