:root {
  color-scheme: light;
  --bg: #f6f7f4;
  --panel: #ffffff;
  --ink: #1f2426;
  --muted: #687174;
  --line: #d9dfdc;
  --accent: #c94f3a;
  --accent-2: #16756f;
  --warn: #a86b15;
  --shadow: 0 14px 34px rgba(31, 36, 38, 0.08);
}

* { box-sizing: border-box; }

.hidden { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
}

button, a.download {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  min-height: 38px;
  padding: 0 14px;
  border-radius: 6px;
  font: inherit;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

button:hover, a.download:hover { border-color: var(--accent-2); }
button.primary, a.download { background: var(--accent-2); color: #fff; border-color: var(--accent-2); }
button.mode-active { background: var(--ink); color: #fff; border-color: var(--ink); }
button.danger { background: var(--accent); color: #fff; border-color: var(--accent); }
button.warn { background: var(--warn); color: #fff; border-color: var(--warn); }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 12px 22px;
  background: rgba(246, 247, 244, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.app-shell {
  min-height: 100vh;
}

.login-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-card {
  width: min(420px, 100%);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 14px;
}

.login-card h1 {
  font-size: 26px;
}

.login-brand {
  min-width: 0;
}

.login-card label,
.word-note label {
  display: grid;
  gap: 6px;
}

.login-card label span,
.word-note label span {
  color: var(--muted);
  font-size: 13px;
}

.login-card input,
.comment-form textarea,
.word-note textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 12px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

.user-chip {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  white-space: nowrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 190px;
  font-weight: 700;
}

.mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 30px;
  border-radius: 6px;
  background: var(--ink);
  color: #fff;
  font-size: 13px;
  letter-spacing: 0;
}

.tabs { display: flex; flex-wrap: wrap; gap: 8px; }
.tab.active { border-color: var(--accent); color: var(--accent); font-weight: 700; }

main {
  width: min(1180px, calc(100vw - 32px));
  margin: 28px auto 70px;
}

.view { display: none; }
.view.active { display: block; }

.panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 18px;
}

h1 { margin: 0 0 8px; font-size: 30px; line-height: 1.2; letter-spacing: 0; }
h2 { margin: 0 0 14px; font-size: 18px; }
p { margin: 0; color: var(--muted); line-height: 1.7; }

.actions { display: flex; flex-wrap: wrap; gap: 10px; justify-content: flex-end; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.stat {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  box-shadow: var(--shadow);
}

.stat .label { color: var(--muted); font-size: 13px; }
.stat .value { margin-top: 8px; font-size: 30px; line-height: 1; font-weight: 800; }

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  box-shadow: var(--shadow);
}

.search-panel {
  display: grid;
  gap: 14px;
  margin-bottom: 16px;
}

.search-row {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto;
  gap: 10px;
}

.search-row input {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0 12px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

.search-results {
  display: grid;
  gap: 10px;
}

.search-count {
  color: var(--muted);
  font-size: 13px;
}

.search-result-list {
  display: grid;
  gap: 10px;
}

.search-result-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: #fff;
}

.search-result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.search-result-head strong {
  font-size: 24px;
  overflow-wrap: anywhere;
}

.rank-badge {
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  padding: 5px 10px;
  font-size: 12px;
  font-weight: 800;
  white-space: nowrap;
}

.search-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
}

.search-source {
  margin: 8px 0 10px;
  color: var(--muted);
  font-size: 12px;
  overflow-wrap: anywhere;
}

.comments,
.word-note {
  display: grid;
  gap: 8px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.comment {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 9px 10px;
  background: #fbfcfa;
}

.comment-meta {
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 4px;
}

.comment-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  align-items: end;
}

.admin-note {
  background: #fbfcfa;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
}

.library-summary {
  margin-bottom: 12px;
  color: var(--muted);
}

.library-list {
  display: grid;
  gap: 10px;
}

.library-categories {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}

.library-category {
  min-height: 96px;
  align-items: flex-start;
  justify-content: flex-start;
  flex-direction: column;
  text-align: left;
  background: var(--panel);
}

.library-category.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(201, 79, 58, 0.12);
}

.library-category span,
.library-category small,
.library-toolbar span {
  color: var(--muted);
}

.library-filter {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) 180px auto;
  gap: 10px;
  margin-bottom: 14px;
  box-shadow: none;
}

.library-filter input,
.library-filter select {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0 12px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

.library-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.library-word-card {
  display: grid;
  gap: 10px;
}

.my-note textarea {
  min-height: 86px;
}

.step-list { display: flex; flex-wrap: wrap; gap: 10px; }
.meta-list { display: grid; grid-template-columns: 86px 1fr; gap: 9px 12px; margin: 0; }
.meta-list dt { color: var(--muted); }
.meta-list dd { margin: 0; word-break: break-all; }

.word-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 26px;
  box-shadow: var(--shadow);
}

.word-card.empty {
  min-height: 180px;
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: center;
}

.word-main {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
}

.word-title {
  font-size: clamp(44px, 8vw, 92px);
  font-weight: 850;
  line-height: 1;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

.word-meta {
  margin-top: 12px;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 14px;
}

.choice-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-top: 24px;
}

.choice-row button { min-height: 54px; font-weight: 700; }

.progress-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 14px;
  color: var(--muted);
}

.pill {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 6px 12px;
}

.word-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.word-list.slider-list {
  display: block;
}

.slider-layout {
  --slider-accent: var(--accent-2);
  display: grid;
  grid-template-columns: minmax(420px, 760px) minmax(280px, 360px);
  justify-content: center;
  align-items: stretch;
  gap: 18px;
}

.slider-card {
  width: 100%;
  min-height: 430px;
  margin: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 8px solid var(--slider-accent);
  border-radius: 8px;
  padding: 24px;
  box-shadow: var(--shadow);
  cursor: pointer;
  user-select: none;
}

.slider-stage-1 { --slider-accent: #c93f32; }
.slider-stage-2 { --slider-accent: #d98324; }
.slider-stage-3 { --slider-accent: #c5a31d; }
.slider-stage-4 { --slider-accent: #5d9f45; }
.slider-stage-5 { --slider-accent: #16756f; }

.slider-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.slider-progress {
  min-width: 86px;
  height: 34px;
  border-radius: 999px;
  background: var(--slider-accent);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 850;
}

.slider-rank {
  color: var(--muted);
  font-size: 14px;
}

.slider-word {
  margin: 54px 0 42px;
  font-size: clamp(58px, 10vw, 124px);
  line-height: 0.95;
  font-weight: 900;
  letter-spacing: 0;
  overflow-wrap: anywhere;
  text-align: center;
}

.slider-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.slider-context {
  min-height: 430px;
  max-height: 430px;
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 8px solid var(--slider-accent);
  border-radius: 8px;
  padding: 16px;
  box-shadow: var(--shadow);
}

.slider-context-section {
  display: grid;
  gap: 8px;
  padding-bottom: 14px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.slider-context-section:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.slider-context-section h2 {
  margin: 0;
  font-size: 16px;
}

.slider-context-section > p:not(.form-note) {
  color: var(--ink);
  font-size: 14px;
}

.slider-context-item {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 9px 10px;
  background: #fbfcfa;
}

.slider-context-item strong {
  display: block;
  font-size: 14px;
}

.slider-context-item span {
  color: var(--muted);
  font-size: 12px;
}

.slider-context-item p {
  margin-top: 6px;
  color: var(--ink);
  font-size: 14px;
}

.word-row {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
}

.learning-milestone {
  position: absolute;
  top: 8px;
  right: 8px;
  min-width: 34px;
  height: 22px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 11px;
  font-weight: 850;
  line-height: 1;
  box-shadow: 0 3px 10px rgba(31, 36, 38, 0.16);
}

.milestone-1 { background: #c93f32; }
.milestone-2 { background: #d98324; }
.milestone-3 { background: #c5a31d; }
.milestone-4 { background: #5d9f45; }
.milestone-5 { background: #16756f; }

.word-row strong {
  display: block;
  font-size: 20px;
  margin-bottom: 8px;
  overflow-wrap: anywhere;
}

.word-row small { color: var(--muted); }
.word-row a { color: var(--accent-2); text-decoration: none; }

.lookup-actions {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  flex-shrink: 0;
}

.dictionary-link {
  color: var(--accent-2);
  text-decoration: none;
}

.audio-link {
  width: 28px;
  height: 28px;
  min-width: 28px;
  border-radius: 999px;
  background: var(--ink);
  color: #fff !important;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 800;
  line-height: 1;
  text-decoration: none;
  letter-spacing: 0;
}

.audio-link:hover {
  background: #000;
}

.word-row-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 10px;
}

button.compact {
  min-height: 32px;
  padding: 0 10px;
  font-size: 13px;
  white-space: nowrap;
}

.export-panel { display: flex; flex-wrap: wrap; gap: 12px; }

.settings-form {
  display: grid;
  gap: 14px;
  max-width: 760px;
}

.settings-form label {
  display: grid;
  gap: 6px;
}

.settings-form label span {
  color: var(--muted);
  font-size: 13px;
}

.settings-form input {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0 12px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

.settings-form input:focus {
  outline: 2px solid rgba(22, 117, 111, 0.18);
  border-color: var(--accent-2);
}

.form-note {
  font-size: 13px;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  max-width: 420px;
  background: var(--ink);
  color: #fff;
  padding: 12px 14px;
  border-radius: 8px;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(10px);
  transition: 0.18s ease;
  pointer-events: none;
}

.toast.show { opacity: 1; transform: translateY(0); }

@media (max-width: 860px) {
  .topbar { align-items: flex-start; flex-direction: column; }
  .user-chip { margin-left: 0; }
  .panel-head { flex-direction: column; }
  .actions { justify-content: flex-start; }
  .stats-grid, .two-col, .word-list, .library-categories, .library-filter { grid-template-columns: 1fr; }
  .choice-row { grid-template-columns: 1fr 1fr; }
  .comment-form { grid-template-columns: 1fr; }
  .library-toolbar { align-items: flex-start; flex-direction: column; }
  .slider-layout { grid-template-columns: 1fr; }
  .slider-context { max-height: none; min-height: 0; }
}