:root {
  color-scheme: light;
  --navy-950: #07162f;
  --navy-900: #0b2146;
  --navy-700: #173e78;
  --cyan-600: #0098b5;
  --cyan-500: #08b4cb;
  --cyan-100: #dff7fa;
  --blue-50: #f3f8ff;
  --slate-900: #18243a;
  --slate-700: #42516a;
  --slate-500: #6c7990;
  --slate-300: #cbd4e1;
  --slate-200: #e3e9f1;
  --white: #fff;
  --shadow: 0 18px 48px rgba(13, 36, 73, 0.10);
  --radius-lg: 22px;
  --radius-md: 15px;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { background: var(--blue-50); }

body {
  margin: 0;
  min-width: 0;
  color: var(--slate-900);
  background:
    radial-gradient(circle at 88% -10%, rgba(8, 180, 203, 0.14), transparent 26rem),
    var(--blue-50);
}

button, input, select { font: inherit; }
button, select { cursor: pointer; }
button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 3px solid rgba(8, 180, 203, 0.38);
  outline-offset: 2px;
}

[hidden] { display: none !important; }

.topbar {
  min-height: 86px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px clamp(20px, 4vw, 64px);
  color: var(--white);
  background: linear-gradient(118deg, var(--navy-950), var(--navy-900) 62%, #0b4563);
  box-shadow: 0 10px 28px rgba(5, 22, 48, 0.16);
}

.brand, .topbar-actions { display: flex; align-items: center; gap: 14px; }
.brand-mark {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 14px 6px 14px 6px;
  color: var(--navy-950);
  background: var(--cyan-500);
  font-weight: 900;
  font-size: 1.28rem;
}

h1, h2, h3, p { margin: 0; }
h1 { font-size: clamp(1.25rem, 2vw, 1.65rem); letter-spacing: .02em; }
h2 { font-size: 1.15rem; }
.eyebrow, .section-kicker {
  margin-bottom: 3px;
  font-size: .75rem;
  line-height: 1.2;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.eyebrow { color: #9adce7; }
.section-kicker { color: var(--cyan-600); font-weight: 800; }

.demo-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 999px;
  color: #d9f7fa;
  background: rgba(255,255,255,.08);
  font-size: .84rem;
}
.demo-badge span { width: 7px; height: 7px; border-radius: 50%; background: var(--cyan-500); }
.live-badge {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 999px;
  color: #d9f7fa;
  background: rgba(255,255,255,.08);
  font-size: .84rem;
}
.live-badge[hidden] { display: none; }
.icon-button, .dialog-close {
  border: 0;
  display: grid;
  place-items: center;
  color: inherit;
  background: rgba(255,255,255,.11);
}
.icon-button { width: 38px; height: 38px; border-radius: 12px; font-size: 1.25rem; }
.icon-button:hover { background: rgba(255,255,255,.19); }

main { width: min(1500px, 100%); margin: 0 auto; padding: 26px clamp(16px, 4vw, 56px) 56px; }
.filter-panel, .book-overview, .unit-panel, .word-panel {
  border: 1px solid rgba(203, 212, 225, .8);
  background: rgba(255,255,255,.92);
  box-shadow: var(--shadow);
}
.filter-panel { padding: 22px; border-radius: var(--radius-lg); }
.section-heading, .panel-heading, .word-toolbar, .results-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.filter-status { color: var(--slate-500); font-size: .88rem; }
.filter-heading-actions { display: flex; align-items: center; gap: 12px; }
.filter-toggle, .filter-summary { display: none; }
.filter-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(130px, 1fr)) minmax(220px, 1.7fr);
  gap: 12px;
  margin-top: 18px;
}
.field { min-width: 0; }
.field label { display: block; margin: 0 0 7px 2px; color: var(--slate-700); font-size: .875rem; font-weight: 700; }
select {
  width: 100%;
  min-height: 44px;
  padding: 0 38px 0 13px;
  border: 1px solid var(--slate-300);
  border-radius: 11px;
  color: var(--slate-900);
  background: var(--white);
}
select:disabled { color: #9aa5b5; background: #f5f7fa; cursor: not-allowed; }

.book-overview {
  margin: 16px 0;
  padding: 22px 24px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
}
.book-overview::after {
  content: "Aa";
  position: absolute;
  right: 30px;
  top: 50%;
  translate: 0 -52%;
  color: rgba(8, 180, 203, .10);
  font-size: clamp(4rem, 9vw, 7.5rem);
  font-weight: 900;
  letter-spacing: -.08em;
  pointer-events: none;
}
.book-meta { position: relative; z-index: 1; display: flex; align-items: center; gap: 22px; }
.book-code {
  width: 70px;
  height: 86px;
  display: grid;
  place-items: center;
  border-radius: 8px 15px 15px 8px;
  color: var(--white);
  background: linear-gradient(145deg, var(--navy-700), var(--cyan-600));
  font-weight: 900;
  box-shadow: 8px 9px 0 var(--cyan-100);
}
.book-copy h2 { margin-bottom: 8px; font-size: clamp(1.15rem, 2vw, 1.55rem); }
.book-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.book-tags span { padding: 5px 9px; border-radius: 8px; color: var(--slate-700); background: #edf3f9; font-size: .875rem; }

.workspace { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 16px; align-items: start; }
.unit-panel, .word-panel { border-radius: var(--radius-lg); }
.unit-panel { padding: 20px 14px; position: sticky; top: 16px; }
.panel-heading { padding: 0 7px 14px; }
.unit-scroll-hint { display: none; }
.unit-list { display: grid; gap: 7px; }
.unit-button {
  width: 100%;
  padding: 12px;
  border: 1px solid transparent;
  border-radius: 12px;
  color: var(--slate-700);
  background: transparent;
  text-align: left;
}
.unit-button strong, .unit-button small { display: block; }
.unit-button strong { font-size: .92rem; line-height: 1.35; }
.unit-button small { margin-top: 4px; color: var(--slate-500); font-size: .875rem; }
.unit-button:hover { background: var(--blue-50); }
.unit-button[aria-current="true"] { color: var(--navy-900); border-color: #b9eaf0; background: var(--cyan-100); }

.word-panel { min-width: 0; padding: 22px; }
.word-toolbar { align-items: flex-start; }
.search-block { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }
.search-field {
  min-width: 240px;
  min-height: 42px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  border: 1px solid var(--slate-300);
  border-radius: 12px;
  background: var(--white);
}
.search-visible-label { color: var(--slate-700); font-size: .875rem; font-weight: 700; white-space: nowrap; }
.search-field:focus-within { border-color: var(--cyan-600); box-shadow: 0 0 0 3px rgba(8,180,203,.12); }
.search-field input { width: 100%; border: 0; outline: 0; color: var(--slate-900); background: transparent; }
.scope-switch { margin: 0; padding: 4px; display: flex; border: 1px solid var(--slate-200); border-radius: 12px; background: #f5f8fb; }
.scope-switch label { position: relative; padding: 7px 10px; border-radius: 8px; color: var(--slate-500); font-size: .875rem; cursor: pointer; }
.scope-switch label:has(input:checked) { color: var(--navy-900); background: var(--white); box-shadow: 0 2px 8px rgba(18,41,77,.09); }
.scope-switch label:has(input:disabled) { opacity: .42; cursor: not-allowed; }
.scope-switch input { position: absolute; opacity: 0; }
.results-line { min-height: 38px; margin-top: 12px; color: var(--slate-500); font-size: .875rem; }
.text-button { padding: 5px; border: 0; color: var(--cyan-600); background: transparent; font-weight: 700; }
.word-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.word-card {
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 16px;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  background: var(--white);
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.word-card:hover { border-color: #9cdee7; transform: translateY(-2px); box-shadow: 0 10px 25px rgba(16, 50, 90, .08); }
.word-head { display: flex; align-items: baseline; gap: 8px; min-width: 0; }
.word-head h3 { font-family: Georgia, "Times New Roman", serif; font-size: 1.35rem; color: var(--navy-900); }
.phonetic { color: var(--cyan-600); font-size: .875rem; }
.meaning { margin-top: 7px; color: var(--slate-700); font-size: .92rem; }
.unit-origin { display: inline-block; margin-top: 8px; color: var(--slate-500); font-size: .875rem; }
.word-actions { display: flex; gap: 6px; }
.round-button {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 1px solid var(--slate-200);
  border-radius: 11px;
  color: var(--navy-700);
  background: var(--blue-50);
}
.round-button:hover { color: var(--white); border-color: var(--cyan-600); background: var(--cyan-600); }
.round-button:disabled { color: #a6afbc; background: #f4f5f7; cursor: not-allowed; }
.primary-button { min-height: 40px; padding: 0 16px; border: 0; border-radius: 11px; color: var(--white); background: var(--navy-700); font-weight: 700; }
.empty-state { padding: 56px 20px; text-align: center; border: 1px dashed var(--slate-300); border-radius: var(--radius-md); background: #fbfcfe; }
.empty-state > span { display: block; color: var(--cyan-600); font-size: 2.2rem; }
.empty-state h3 { margin-top: 8px; }
.empty-state p { margin: 8px 0 16px; color: var(--slate-500); }

.dialog-backdrop {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  justify-items: end;
  background: rgba(4, 14, 31, .56);
  backdrop-filter: blur(5px);
}
.word-dialog {
  width: min(480px, 92vw);
  height: 100%;
  overflow-y: auto;
  padding: 26px;
  color: var(--slate-900);
  background: var(--white);
  box-shadow: -24px 0 60px rgba(4, 16, 36, .24);
  animation: slide-in .22s ease-out;
}
.dialog-close { width: 38px; height: 38px; margin-left: auto; border-radius: 12px; color: var(--slate-700); background: #edf2f7; font-size: 1.5rem; }
.detail-label { color: var(--cyan-600); font-size: .875rem; font-weight: 800; letter-spacing: .1em; }
.detail-word { margin-top: 5px; font-family: Georgia, "Times New Roman", serif; color: var(--navy-900); font-size: 2.6rem; }
.detail-phonetic { margin-top: 4px; color: var(--cyan-600); }
.detail-meaning { margin-top: 18px; font-size: 1.18rem; font-weight: 800; }
.detail-section { margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--slate-200); }
.detail-section h3 { margin-bottom: 10px; font-size: .875rem; color: var(--slate-500); text-transform: uppercase; letter-spacing: .1em; }
.example { color: var(--navy-900); font-family: Georgia, "Times New Roman", serif; font-size: 1.15rem; line-height: 1.6; }
.example-meaning { margin-top: 5px; color: var(--slate-500); line-height: 1.6; }
.syllables, .resource-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.syllable { padding: 7px 11px; border-radius: 9px; color: var(--navy-700); background: var(--cyan-100); font-weight: 800; }
.resource-button, .resource-missing { min-height: 42px; display: inline-flex; align-items: center; gap: 7px; padding: 0 12px; border-radius: 10px; font-size: .875rem; }
.resource-button { border: 1px solid #aadfe6; color: var(--navy-700); background: #effbfc; }
.resource-missing { color: var(--slate-500); background: #f2f4f7; }
.media-stage:not(:empty) { margin-top: 14px; }
.media-stage img, .media-stage video { display: block; width: 100%; max-height: 360px; border-radius: 12px; object-fit: contain; background: #f2f4f7; }

.live-status {
  position: fixed;
  z-index: 40;
  right: 22px;
  bottom: 22px;
  max-width: min(420px, calc(100vw - 32px));
  padding: 13px 16px;
  border: 1px solid #7ed3df;
  border-radius: 12px;
  color: var(--white);
  background: var(--navy-900);
  box-shadow: 0 18px 44px rgba(4, 20, 45, .28);
  font-size: .9rem;
  line-height: 1.5;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

@keyframes slide-in { from { transform: translateX(28px); opacity: .7; } to { transform: translateX(0); opacity: 1; } }

@media (max-width: 1050px) {
  .filter-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .field-book { grid-column: span 2; }
  .workspace { grid-template-columns: 210px minmax(0, 1fr); }
  .word-list { grid-template-columns: 1fr; }
  .word-toolbar { display: block; }
  .search-block { margin-top: 16px; justify-content: flex-start; }
}

@media (max-width: 720px) {
  .topbar { min-height: 66px; padding: 10px 14px; }
  .brand-mark { width: 38px; height: 38px; }
  .eyebrow, .demo-badge { display: none; }
  main { padding: 12px 12px 36px; }
  .filter-panel, .book-overview, .word-panel { padding: 15px; border-radius: 17px; }
  .filter-panel.is-compact { padding: 12px 15px; }
  .filter-panel.is-compact .filter-grid { display: none; }
  .filter-toggle { display: inline-flex; align-items: center; min-height: 40px; padding: 0 10px; border: 1px solid #aadfe6; border-radius: 10px; color: var(--navy-700); background: #effbfc; font-size: .84rem; font-weight: 700; white-space: nowrap; }
  .filter-summary { display: block; margin-top: 5px; color: var(--slate-500); font-size: .82rem; }
  .filter-grid { grid-template-columns: 1fr 1fr; }
  .field-book { grid-column: span 2; }
  .filter-status { display: none; }
  .book-overview { margin: 10px 0; padding: 12px 15px; }
  .book-overview:has(> .filter-status) { display: none; }
  .book-overview::after { right: 8px; font-size: 4rem; }
  .book-meta { gap: 0; }
  .book-code { display: none; }
  .book-copy { min-width: 0; }
  .book-copy h2 { margin-bottom: 5px; font-size: 1rem; line-height: 1.35; }
  .book-tags span { padding: 3px 7px; font-size: .78rem; }
  .workspace { display: block; }
  .unit-panel { position: static; margin-bottom: 10px; padding: 12px; }
  .panel-heading { gap: 6px; padding: 0 4px 8px; }
  .unit-scroll-hint { display: inline; margin-left: auto; color: var(--slate-500); font-size: .72rem; white-space: nowrap; }
  .unit-panel:not(:has(.unit-button)) .unit-scroll-hint { display: none; }
  .unit-list { display: flex; overflow-x: auto; gap: 6px; padding-bottom: 2px; scroll-snap-type: x proximity; scrollbar-width: none; }
  .unit-list::-webkit-scrollbar { display: none; }
  .unit-button { width: auto; min-width: 138px; max-width: 180px; padding: 10px; scroll-snap-align: start; }
  .search-field { min-width: 0; width: 100%; }
  .search-block { display: grid; grid-template-columns: 1fr; margin-top: 10px; }
  .scope-switch { width: max-content; }
  .word-card { padding: 12px; }
  .round-button { width: 44px; height: 44px; }
  .resource-button, .resource-missing { min-height: 44px; }
  .word-dialog { width: 100%; }
  .live-status { right: 16px; bottom: 16px; }
}

@media (max-width: 430px) {
  .filter-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-top: 12px; }
  .field-book { grid-column: span 2; }
  .field label { margin-bottom: 5px; font-size: .78rem; }
  select { padding-left: 9px; padding-right: 24px; font-size: .86rem; }
  .book-tags span:last-child { display: none; }
  .scope-switch { width: 100%; }
  .scope-switch label { flex: 1; text-align: center; }
  .word-head { display: block; }
  .phonetic { display: block; margin-top: 3px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
}