:root {
  --forest: #4056d6;
  --forest-deep: #17204f;
  --forest-soft: #e8ecff;
  --paper: #f8f9ff;
  --canvas: #f4f6fb;
  --surface: #ffffff;
  --ink: #1b2140;
  --muted: #5f6884;
  --line: #dbe0f0;
  --line-strong: #c3cae4;
  --gold: #ffb000;
  --coral: #f05263;
  --blue: #0b9fc4;
  --shadow: 0 18px 46px rgba(23, 32, 79, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  scroll-behavior: smooth;
  background: var(--canvas);
}

body {
  min-width: 320px;
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(21, 29, 60, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(21, 29, 60, 0.028) 1px, transparent 1px),
    var(--canvas);
  background-size: 34px 34px;
  font-family:
    "Segoe UI",
    "Microsoft YaHei",
    system-ui,
    sans-serif;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(77, 90, 143, 0.35);
  outline-offset: 2px;
}

[hidden] {
  display: none !important;
}

.reading-progress {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 80;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--coral), var(--blue));
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

.intensive-topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: 64px;
  padding:
    max(8px, env(safe-area-inset-top))
    max(16px, env(safe-area-inset-right))
    8px
    max(16px, env(safe-area-inset-left));
  display: grid;
  grid-template-columns: minmax(94px, 1fr) auto minmax(94px, 1fr);
  align-items: center;
  gap: 12px;
  color: #ffffff;
  background: var(--forest-deep);
  border-bottom: 1px solid rgba(255, 255, 255, 0.11);
}

.topbar-link {
  color: #d9dce8;
  font-size: 12px;
  font-weight: 800;
  text-decoration: none;
}

.topbar-links {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

/* 额外的兄弟板块入口：桌面显示，窄屏隐藏，避免顶栏挤压重叠 */
.topbar-link-extra {
  display: none;
}

@media (min-width: 641px) {
  .topbar-links .topbar-link-extra {
    display: inline-flex;
  }
}

.topbar-link:hover {
  color: #ffffff;
}

.topbar-source {
  justify-self: end;
}

.intensive-brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: #ffffff;
  text-decoration: none;
}

.brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  color: #ffffff;
  background: var(--gold);
  border-radius: 8px;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 800;
}

.brand-copy {
  display: grid;
  gap: 1px;
}

.brand-copy strong {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 17px;
  line-height: 1.1;
}

.brand-copy small {
  color: #a9aec3;
  font-size: 8px;
  line-height: 1.2;
}

.intensive-hero {
  padding: 42px max(22px, calc((100vw - 1160px) / 2)) 36px;
  color: var(--ink);
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(350px, 0.72fr);
  align-items: end;
  gap: 46px;
}

.hero-eyebrow {
  margin: 0 0 8px;
  color: var(--coral);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.hero-copy h1 {
  margin: 0;
  color: var(--forest-deep);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 45px;
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-description {
  max-width: 620px;
  margin: 13px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.hero-stats {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.stat-chip {
  min-height: 38px;
  padding: 7px 11px;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  color: #444A60;
  background: #eeeff3;
  border: 1px solid #d6d8e2;
  border-radius: 8px;
  font-size: 11px;
}

.stat-chip strong {
  color: var(--forest);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
}

.hero-tools {
  padding-left: 26px;
  display: grid;
  gap: 18px;
  border-left: 3px solid var(--gold);
}

.setting-group {
  display: grid;
  gap: 8px;
}

.setting-label {
  color: #6e7281;
  font-size: 11px;
  font-weight: 800;
}

.segmented-control {
  min-height: 46px;
  padding: 4px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
  background: #e9eaef;
  border: 1px solid #d3d5df;
  border-radius: 9px;
}

.segment-button {
  min-width: 0;
  min-height: 36px;
  padding: 0 12px;
  color: #606474;
  background: transparent;
  border: 0;
  border-radius: 7px;
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
}

.segment-button.is-active {
  color: #ffffff;
  background: var(--forest);
  box-shadow: 0 5px 14px rgba(13, 21, 52, 0.16);
}

.tool-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(124px, 1fr));
  gap: 9px;
}

.tool-button {
  min-height: 44px;
  padding: 0 14px;
  color: var(--forest);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
}

.tool-button:hover {
  border-color: #8e94ad;
}

.tool-button.is-primary {
  color: #ffffff;
  background: var(--forest);
  border-color: var(--forest);
}

.tool-button.is-primary:hover {
  background: var(--forest-deep);
}

.tool-button.is-playing {
  color: #ffffff;
  background: var(--coral);
  border-color: var(--coral);
}

.tool-button.is-muted {
  color: #6e7281;
  background: #eeeff3;
  border-color: var(--line);
}

.paper-select {
  width: 100%;
  min-height: 46px;
  padding: 0 12px;
  color: var(--ink);
  background: #fbfbfc;
  border: 1px solid var(--line);
  border-radius: 9px;
  font-size: 13px;
  font-weight: 700;
}

.paper-select:focus {
  border-color: #757fa6;
  box-shadow: 0 0 0 3px rgba(77, 90, 143, 0.12);
  outline: 0;
}

.intensive-layout {
  width: min(1160px, calc(100% - 44px));
  margin: 0 auto;
  padding: 28px 0 max(52px, env(safe-area-inset-bottom));
  display: grid;
  grid-template-columns: 238px minmax(0, 1fr);
  align-items: start;
  gap: 28px;
}

.intensive-layout.has-word-panel {
  grid-template-columns: 238px minmax(0, 1fr) 336px;
}

.piece-navigation {
  position: sticky;
  top: 84px;
  max-height: calc(100dvh - 104px);
  overflow: auto;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 34px rgba(14, 21, 49, 0.06);
}

.navigation-heading {
  padding: 15px 15px 11px;
  color: #7b7f8e;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--line);
}

.navigation-link {
  position: relative;
  padding: 12px 14px;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 9px;
  color: #464B61;
  border-bottom: 1px solid #e5e6eb;
  text-decoration: none;
}

.navigation-link:last-child {
  border-bottom: 0;
}

.navigation-link:hover {
  background: #f3f4f7;
}

.navigation-link.is-active {
  color: var(--forest-deep);
  background: var(--forest-soft);
  box-shadow: inset 3px 0 0 var(--gold);
}

.navigation-number {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  color: var(--forest);
  background: #e7e8ee;
  border-radius: 7px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 12px;
  font-weight: 800;
}

.navigation-link.is-active .navigation-number {
  color: #ffffff;
  background: var(--forest);
}

.navigation-copy {
  min-width: 0;
  display: grid;
  gap: 3px;
}

.navigation-copy strong {
  overflow: hidden;
  font-size: 12px;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.navigation-copy span {
  color: #838795;
  font-size: 10px;
  line-height: 1.35;
}

.intensive-content {
  min-width: 0;
  display: grid;
  gap: 22px;
}

.loading-state,
.error-state {
  min-height: 260px;
  padding: 34px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.loading-state strong,
.error-state strong {
  color: var(--forest);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 24px;
}

.loading-state span,
.error-state span {
  color: var(--muted);
  font-size: 12px;
}

.intensive-piece {
  scroll-margin-top: 88px;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 36px rgba(14, 21, 49, 0.055);
}

.piece-head {
  padding: 23px 26px 21px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  background: #f7f8f3;
  border-bottom: 1px solid var(--line);
}

.piece-head-copy {
  min-width: 0;
}

.piece-kicker {
  margin: 0 0 7px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  color: #757987;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.06em;
}

.piece-type {
  padding: 3px 7px;
  color: #ffffff;
  background: var(--blue);
  border-radius: 5px;
  letter-spacing: 0;
}

.piece-type.is-section-a {
  background: var(--coral);
}

.piece-type.is-section-b {
  background: var(--blue);
}

.piece-type.is-section-c {
  background: var(--forest);
}

.piece-head h2 {
  margin: 0;
  color: var(--forest-deep);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 28px;
  line-height: 1.2;
}

.piece-meta {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.5;
}

.piece-play-button {
  min-width: 92px;
  min-height: 42px;
  padding: 0 13px;
  flex: 0 0 auto;
  color: var(--forest);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
}

.piece-play-button.is-playing {
  color: #ffffff;
  background: var(--coral);
  border-color: var(--coral);
}

.paragraph-list {
  padding: 0 26px;
}

.paragraph-row {
  position: relative;
  padding: 25px 0 25px 52px;
  border-bottom: 1px solid #e3e4e9;
}

.paragraph-row:last-child {
  border-bottom: 0;
}

.paragraph-row::before {
  content: "";
  position: absolute;
  top: 29px;
  bottom: 29px;
  left: 40px;
  width: 2px;
  background: #d9dbe4;
}

.paragraph-row.has-grammar::before {
  background: var(--gold);
}

.paragraph-number {
  position: absolute;
  top: 24px;
  left: 0;
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  color: #555B71;
  background: #edeef3;
  border: 1px solid #d6d8e2;
  border-radius: 7px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 11px;
  font-weight: 800;
}

.paragraph-row.has-grammar .paragraph-number {
  color: #6a4d0b;
  background: #faefd3;
  border-color: #ead69f;
}

.paragraph-toolbar {
  min-height: 32px;
  margin-bottom: 7px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.grammar-count {
  color: #8a681e;
  font-size: 10px;
  font-weight: 800;
}

.paragraph-play-button {
  min-height: 32px;
  padding: 0 10px;
  color: #484e64;
  background: #f1f2f5;
  border: 1px solid #d6d8e1;
  border-radius: 7px;
  font-size: 11px;
  font-weight: 800;
  cursor: pointer;
}

.paragraph-play-button:hover {
  border-color: #9da2b7;
}

.paragraph-play-button.is-playing {
  color: #ffffff;
  background: var(--coral);
  border-color: var(--coral);
}

.paragraph-english,
.paragraph-chinese {
  margin: 0;
}

.paragraph-english {
  color: #20253b;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
  line-height: 1.78;
}

.paragraph-chinese {
  margin-top: 12px;
  padding-left: 13px;
  color: #686c7b;
  border-left: 3px solid #c9ccd9;
  font-size: 13px;
  line-height: 1.78;
}

body.is-english-only .paragraph-chinese {
  display: none;
}

.grammar-list {
  margin-top: 16px;
  display: grid;
  gap: 8px;
}

.grammar-note {
  overflow: hidden;
  background: #fbf8ed;
  border: 1px solid #e7d9ad;
  border-radius: 8px;
}

.grammar-note[open] {
  border-color: #d4bc70;
  box-shadow: 0 8px 20px rgba(103, 78, 19, 0.07);
}

.grammar-summary {
  min-height: 48px;
  padding: 10px 13px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 18px;
  align-items: center;
  gap: 10px;
  color: #4d4730;
  cursor: pointer;
  list-style: none;
}

.grammar-summary::-webkit-details-marker {
  display: none;
}

.grammar-summary::after {
  content: "+";
  color: #8a681e;
  font-size: 18px;
  font-weight: 800;
  text-align: center;
}

.grammar-note[open] .grammar-summary::after {
  content: "−";
}

.grammar-tag {
  padding: 3px 7px;
  color: #6c4e0b;
  background: #f0dfaa;
  border-radius: 5px;
  font-size: 10px;
  font-weight: 900;
}

.grammar-summary strong {
  min-width: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.5;
}

.grammar-body {
  padding: 0 14px 14px 51px;
  color: #696046;
  font-size: 12px;
  line-height: 1.72;
  border-top: 1px solid #eee2be;
}

.grammar-location {
  margin: 0 0 8px;
  color: #9b7c31;
  font-size: 10px;
  font-weight: 800;
}

.grammar-explanation {
  margin: 0;
}

.extension-section {
  padding: 0 26px 26px;
}

.extension-heading {
  margin: 0 0 11px;
  padding-top: 21px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  border-top: 1px solid #e3e4e9;
}

.extension-heading h3 {
  margin: 0;
  color: var(--forest);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
}

.extension-heading span {
  color: var(--muted);
  font-size: 10px;
}

/* ---------------------------------------------------------- 答案提示与技巧 */

.tip-block {
  padding: 15px 22px 17px;
  background: #fdf8ea;
  border-bottom: 1px solid #efe2c1;
}

.tip-head {
  display: flex;
  align-items: center;
  gap: 9px;
}

.tip-kicker {
  padding: 3px 8px;
  color: #8a6420;
  background: #f6e6bf;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.04em;
}

.tip-type {
  color: #9b8963;
  font-size: 10px;
  font-weight: 800;
}

.tip-list {
  margin: 10px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 5px;
  color: #6c5c3a;
  font-size: 12px;
  line-height: 1.62;
}

.cue-block {
  margin-top: 13px;
  padding: 11px 12px 12px;
  background: #f4f5f8;
  border: 1px solid #dbdde7;
  border-left: 3px solid #7a83a8;
  border-radius: 7px;
}

.cue-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.cue-kicker {
  color: #3d466b;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.05em;
}

.cue-chip {
  padding: 2px 8px;
  color: #373f61;
  background: #e4e6ef;
  border: 1px solid #cbcfe0;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 800;
}

.cue-tip-list {
  margin: 8px 0 0;
  padding-left: 17px;
  display: grid;
  gap: 4px;
  color: #565b70;
  font-size: 11.5px;
  line-height: 1.62;
}

.cue-count {
  color: #3d466b;
  font-size: 11px;
  font-weight: 800;
}

.key-word-row {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
}

.key-word-label {
  color: #7b7f8e;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.05em;
}

.key-word-chip {
  padding: 3px 10px;
  color: var(--blue);
  background: #eff1f7;
  border: 1px solid #d5d9ea;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}

.key-word-chip:hover {
  color: #ffffff;
  background: var(--blue);
  border-color: var(--blue);
}

.phrase-row {
  margin-top: 9px;
}

.key-word-chip.phrase-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: #8a6420;
  background: #fdf5e2;
  border-color: #ecd9ae;
  font-size: 11.5px;
}

.key-word-chip.phrase-chip:hover {
  color: #ffffff;
  background: #b58a2c;
  border-color: #b58a2c;
}

.phrase-chip-text {
  white-space: nowrap;
}

.phrase-levels {
  display: inline-flex;
  align-items: center;
  gap: 3px;
}

.key-word-chip.phrase-chip .phrase-levels {
  margin-right: -2px;
}

.phrase-level {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 15px;
  height: 15px;
  padding: 0 3px;
  border-radius: 4px;
  font-size: 9.5px;
  font-style: normal;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0;
}

.phrase-level.is-cet4 {
  color: #1b5f8c;
  background: #dceaf5;
}

.phrase-level.is-cet6 {
  color: #7a3d8c;
  background: #eee0f4;
}

.phrase-level.is-kaoyan {
  color: #a2542a;
  background: #f8e5d6;
}

.key-word-chip.phrase-chip:hover .phrase-level.is-cet4,
.key-word-chip.phrase-chip:hover .phrase-level.is-cet6,
.key-word-chip.phrase-chip:hover .phrase-level.is-kaoyan {
  color: #6b4a12;
  background: #ffffff;
}

.word-levels {
  margin: 4px 0 0;
}

.word-levels .phrase-level {
  min-width: 18px;
  height: 18px;
  margin-right: 4px;
  font-size: 11px;
  border-radius: 5px;
}

body.is-cues-hidden .cue-block {
  display: none;
}

body.is-cues-hidden .cue-count {
  display: none;
}

/* ------------------------------------------------------------- 单词点击 */

.word-token {
  margin: 0;
  padding: 1px 0;
  color: inherit;
  background: transparent;
  border: 0;
  border-bottom: 1px dotted rgba(66, 78, 128, 0.46);
  border-radius: 0;
  font: inherit;
  line-height: inherit;
}

.word-token:hover {
  color: var(--forest-deep);
  background: #edeff6;
  border-bottom-color: #2f725e;
}

.word-token.is-unknown-token {
  color: #a43d37;
  background: #fff1ef;
  border-bottom-color: #d96c63;
}

.word-token.is-known-token {
  color: #313d6c;
  background: #edf7f1;
  border-bottom-color: #6cab92;
}

/* ----------------------------------------------------------- 逐题验证 */

.question-section {
  padding: 0 26px 26px;
}

.question-section-head {
  margin: 0 0 12px;
  padding-top: 21px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  border-top: 1px solid #e3e4e9;
}

.question-section-head h3 {
  margin: 0;
  color: var(--forest);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
}

.question-progress {
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
}

.question-reset {
  margin-left: auto;
  padding: 5px 11px;
  color: var(--muted);
  background: #f7f6f4;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 11px;
  font-weight: 700;
}

.question-reset:hover {
  color: var(--coral);
  background: #fdf2f0;
  border-color: #e9c4bf;
}

.question-list {
  display: grid;
  gap: 12px;
}

.question-card {
  padding: 15px 16px 16px;
  background: #fdfdfb;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.question-card.is-revealed {
  background: #ffffff;
  border-color: var(--line-strong);
}

.question-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  margin-bottom: 9px;
}

.question-number {
  color: var(--forest);
  font-size: 12px;
  font-weight: 900;
}

.question-type {
  padding: 2px 8px;
  color: #373f61;
  background: #e4e6ef;
  border: 1px solid #cbcfe0;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 800;
}

.question-locate {
  margin-left: auto;
  padding: 2px 8px;
  color: var(--blue);
  background: #eff1f7;
  border: 1px solid #d5d9ea;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 800;
  text-decoration: none;
}

.question-locate:hover {
  color: #ffffff;
  background: var(--blue);
  border-color: var(--blue);
}

.question-stem {
  margin: 0 0 11px;
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 15px;
  line-height: 1.62;
}

.question-options {
  display: grid;
  gap: 7px;
}

.question-option {
  width: 100%;
  padding: 9px 11px;
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  align-items: start;
  gap: 9px;
  color: var(--ink);
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 7px;
  font-size: 13.5px;
  line-height: 1.55;
  text-align: left;
}

.question-option:hover {
  border-color: var(--line-strong);
  background: #f7f8fa;
}

.question-option.is-selected {
  border-color: var(--blue);
  background: #eff1f7;
}

.question-option.is-correct {
  border-color: #6cab92;
  background: #edf7f1;
}

.question-option.is-wrong {
  border-color: #d96c63;
  background: #fff1ef;
}

.option-letter {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  color: var(--blue);
  background: #eff1f7;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 900;
}

.question-option.is-selected .option-letter {
  color: #ffffff;
  background: var(--blue);
}

.question-option.is-correct .option-letter {
  color: #ffffff;
  background: #4d8f76;
}

.question-option.is-wrong .option-letter {
  color: #ffffff;
  background: var(--coral);
}

.option-text {
  min-width: 0;
  overflow-wrap: anywhere;
}

.question-actions {
  margin-top: 11px;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.question-submit,
.question-translation-toggle,
.question-analysis-toggle {
  padding: 6px 13px;
  border-radius: 6px;
  font-size: 11.5px;
  font-weight: 800;
}

.question-submit {
  color: #ffffff;
  background: var(--forest);
  border: 1px solid var(--forest);
}

.question-submit:hover {
  background: var(--forest-deep);
}

.question-card.is-answered .question-submit {
  color: #3d466b;
  background: #e4e6ef;
  border-color: #cbcfe0;
}

.question-translation-toggle,
.question-analysis-toggle {
  color: var(--blue);
  background: #ffffff;
  border: 1px solid #d5d9ea;
}

.question-translation-toggle:hover,
.question-analysis-toggle:hover {
  background: #eff1f7;
}

.question-feedback {
  margin: 9px 0 0;
  min-height: 0;
  color: var(--muted);
  font-size: 11.5px;
  font-weight: 700;
}

.question-feedback:empty {
  display: none;
}

.question-feedback.is-correct {
  color: #2f725e;
}

.question-feedback.is-wrong {
  color: #a43d37;
}

.question-feedback.is-revealed {
  color: var(--forest);
}

.question-translation {
  margin-top: 11px;
  padding: 10px 11px;
  color: #4a4e5f;
  background: #f8f7f5;
  border: 1px dashed #d3d5de;
  border-radius: 7px;
  font-size: 12.5px;
  line-height: 1.68;
}

.question-stem-translation {
  margin: 0;
  color: var(--forest);
  font-weight: 700;
}

.question-translation ul {
  margin: 7px 0 0;
  padding-left: 0;
  display: grid;
  gap: 3px;
  list-style: none;
}

.question-translation li {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 6px;
}

.question-translation li > span:first-child {
  color: var(--muted);
  font-weight: 800;
}

.question-analysis {
  margin-top: 12px;
  padding: 12px 12px 13px;
  display: grid;
  gap: 11px;
  background: #f7f8f3;
  border: 1px solid #e8e5e0;
  border-radius: 8px;
}

.analysis-row {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 10px;
}

.analysis-label {
  padding-top: 1px;
  color: #7b7f8e;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.05em;
}

.analysis-body {
  min-width: 0;
  color: #3f4354;
  font-size: 12.5px;
  line-height: 1.68;
}

.analysis-body p {
  margin: 0;
}

.analysis-body p + p {
  margin-top: 5px;
}

.analysis-answer {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
}

.analysis-answer strong {
  color: #2f725e;
  font-size: 15px;
  font-weight: 900;
}

.analysis-answer span[lang="en"] {
  min-width: 0;
  overflow-wrap: anywhere;
}

.analysis-type {
  padding: 2px 8px;
  color: #373f61;
  background: #e4e6ef;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 800;
}

.analysis-signal {
  color: #8a6420;
  font-weight: 800;
}

.analysis-pairs,
.analysis-verdicts {
  margin: 0;
  padding-left: 0;
  display: grid;
  gap: 7px;
  list-style: none;
}

.analysis-pairs li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
}

.analysis-pairs li em {
  flex-basis: 100%;
  color: var(--muted);
  font-size: 11.5px;
  font-style: normal;
}

.analysis-arrow {
  color: var(--gold);
  font-weight: 900;
}

.analysis-verdicts li {
  padding: 8px 10px;
  background: #ffffff;
  border: 1px solid #e4e5e9;
  border-radius: 7px;
}

.verdict-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.verdict-letter {
  color: var(--blue);
  font-weight: 900;
}

.verdict-flag {
  padding: 2px 7px;
  color: #a43d37;
  background: #fff1ef;
  border: 1px solid #f0d3cf;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 800;
}

.verdict-reason {
  margin: 5px 0 0;
  color: #4a4e5f;
  font-size: 12px;
}

.verdict-source {
  margin: 5px 0 0;
  padding-left: 9px;
  color: var(--muted);
  border-left: 2px solid #dfe0e6;
  font-size: 11.5px;
  overflow-wrap: anywhere;
}

.word-panel {
  position: sticky;
  top: 84px;
  max-height: calc(100dvh - 108px);
  padding: 20px 18px 26px;
  overflow: auto;
  background: #fbfaf5;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 34px rgba(14, 21, 49, 0.06);
}

.word-panel-head {
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.09em;
}

.icon-button {
  min-height: 28px;
  padding: 4px 8px;
  color: var(--forest);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 5px;
  font-size: 10px;
  font-weight: 800;
}

.icon-button:hover {
  background: var(--forest-soft);
}

.word-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.word-heading h2 {
  min-width: 0;
  margin: 0;
  color: var(--forest-deep);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 29px;
  line-height: 1.12;
  overflow-wrap: anywhere;
}

.compact-button {
  flex: 0 0 auto;
  min-height: 30px;
  padding: 5px 10px;
  color: #ffffff;
  background: var(--forest);
  border: 0;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 800;
}

.compact-button:hover {
  background: #1f2951;
}

.word-phonetic {
  min-height: 20px;
  margin: 8px 0 0;
  color: var(--blue);
  font-size: 14px;
}

.word-lookup-status {
  min-height: 18px;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.5;
}

.word-meanings {
  min-height: 30px;
  margin-top: 9px;
}

.word-meanings ul {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
  list-style: none;
}

.word-meanings li {
  padding: 9px 10px;
  color: #313547;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 13px;
  line-height: 1.55;
}

.word-block {
  margin-top: 18px;
  padding-top: 15px;
  border-top: 1px solid var(--line);
}

.word-block-label {
  color: var(--muted);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.word-phrases ul {
  margin: 9px 0 0;
  padding: 0;
  display: grid;
  gap: 7px;
  list-style: none;
}

.word-phrases li {
  padding: 8px 10px;
  display: grid;
  gap: 3px;
  background: #f6f4ea;
  border: 1px solid #e6e1cf;
  border-radius: 6px;
  font-size: 12px;
  line-height: 1.5;
}

.word-phrases li strong {
  color: var(--forest-deep);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 14px;
}

.word-phrases li span {
  color: #5d616f;
}

.word-examples {
  margin-top: 9px;
  display: grid;
  gap: 10px;
}

.word-example {
  padding-left: 10px;
  border-left: 2px solid #d5d9ea;
}

.word-example p {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
}

.word-example p:first-child {
  color: #2b2f40;
  font-family: Georgia, "Times New Roman", serif;
}

.word-example p + p {
  color: var(--muted);
}

.word-context {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.word-context > span {
  color: var(--muted);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.word-context p {
  margin: 9px 0 0;
  font-size: 13px;
  line-height: 1.65;
}

#wordContextSentence {
  color: #2b2f40;
  font-family: Georgia, "Times New Roman", serif;
}

#wordContextTranslation {
  color: var(--muted);
}

.word-note-field {
  margin-top: 19px;
  display: grid;
  gap: 7px;
}

.word-note-field > span {
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
}

.word-note-field textarea {
  width: 100%;
  padding: 12px;
  color: var(--ink);
  background: #fbfbfc;
  border: 1px solid var(--line);
  border-radius: 7px;
  font-size: 13px;
  line-height: 1.65;
  resize: vertical;
}

.word-note-field textarea:focus {
  border-color: #757fa6;
  box-shadow: 0 0 0 3px rgba(77, 90, 143, 0.12);
  outline: 0;
}

.word-actions {
  margin-top: 15px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 9px;
}

.word-panel-head + .word-actions {
  margin-top: 0;
  margin-bottom: 12px;
}

.word-panel-head + .word-actions + .word-panel-footnote {
  margin-top: 0;
  margin-bottom: 16px;
}

.mark-button {
  min-height: 40px;
  padding: 8px 15px;
  border: 1px solid transparent;
  border-radius: 7px;
  font-size: 12px;
  font-weight: 800;
}

.mark-button.is-unknown {
  color: #a43d37;
  background: #fff1ef;
  border-color: #efc5bf;
}

.mark-button.is-unknown:hover,
.mark-button.is-unknown.is-active {
  color: #ffffff;
  background: var(--coral);
  border-color: var(--coral);
}

.mark-button.is-known {
  color: #2f3b6c;
  background: #edf7f1;
  border-color: #b9c0dc;
}

.mark-button.is-known:hover,
.mark-button.is-known.is-active {
  color: #ffffff;
  background: #3f4c80;
  border-color: #3f4c80;
}

.word-panel-footnote {
  margin: 14px 0 0;
  color: #8a8c96;
  font-size: 10.5px;
  line-height: 1.6;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: max(20px, env(safe-area-inset-bottom));
  z-index: 90;
  max-width: min(88vw, 420px);
  padding: 10px 15px;
  color: #ffffff;
  background: rgba(11, 17, 41, 0.95);
  border-radius: 8px;
  box-shadow: 0 12px 30px rgba(7, 11, 28, 0.22);
  font-size: 12px;
  font-weight: 700;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 12px);
  transition:
    opacity 160ms ease,
    transform 160ms ease;
}

.toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

@media (max-width: 900px) {
  .intensive-hero {
    padding-top: 32px;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
    gap: 28px;
  }

  .hero-tools {
    padding: 18px 0 0;
    border-top: 2px solid var(--gold);
    border-left: 0;
  }

  .intensive-layout {
    width: min(100% - 28px, 820px);
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .intensive-layout.has-word-panel {
    grid-template-columns: minmax(0, 1fr);
  }

  .word-panel {
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
    top: auto;
    z-index: 80;
    width: 100%;
    max-height: min(80vh, 680px);
    max-height: min(80dvh, 680px);
    padding: 18px max(16px, env(safe-area-inset-right))
      max(24px, env(safe-area-inset-bottom))
      max(16px, env(safe-area-inset-left));
    border: 0;
    border-top: 1px solid var(--line-strong);
    border-radius: 14px 14px 0 0;
    box-shadow: 0 -24px 60px rgba(8, 13, 34, 0.24);
    animation: word-panel-in 180ms ease-out;
  }

  .word-heading h2 {
    font-size: 27px;
  }

  .piece-navigation {
    top: 70px;
    max-height: none;
    padding: 7px;
    display: flex;
    gap: 7px;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .piece-navigation::-webkit-scrollbar {
    display: none;
  }

  .navigation-heading {
    display: none;
  }

  .navigation-link {
    min-width: 168px;
    padding: 9px 10px;
    grid-template-columns: 27px minmax(0, 1fr);
    border: 1px solid #e1e2e8;
    border-radius: 7px;
  }

  .navigation-link:last-child {
    border: 1px solid #e1e2e8;
  }

  .navigation-number {
    width: 27px;
    height: 27px;
  }
}

@keyframes word-panel-in {
  from {
    transform: translateY(18px);
    opacity: 0;
  }

  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@media (max-width: 640px) {
  .intensive-topbar {
    grid-template-columns: 74px minmax(0, 1fr) 74px;
    min-height: 58px;
    gap: 7px;
  }

  .topbar-links {
    gap: 6px;
  }

  .topbar-links .topbar-back {
    font-size: 0;
  }

  .topbar-links .topbar-back::before {
    content: "←";
    font-size: 12px;
  }

  .topbar-link {
    font-size: 10px;
  }

  .intensive-brand {
    justify-content: center;
  }

  .brand-mark {
    width: 32px;
    height: 32px;
  }

  .brand-copy strong {
    font-size: 15px;
  }

  .brand-copy small {
    display: none;
  }

  .intensive-hero {
    padding: 27px 18px 24px;
  }

  .hero-copy h1 {
    font-size: 32px;
  }

  .hero-description {
    font-size: 13px;
  }

  .hero-stats {
    gap: 7px;
  }

  .stat-chip {
    min-height: 34px;
    padding: 6px 9px;
  }

  .stat-chip strong {
    font-size: 16px;
  }

  .tool-actions {
    grid-template-columns: minmax(0, 1fr);
  }

  .intensive-layout {
    width: min(100% - 18px, 820px);
    padding-top: 12px;
  }

  .piece-navigation {
    top: 62px;
  }

  .piece-head {
    padding: 19px 17px 17px;
    display: grid;
  }

  .piece-head h2 {
    font-size: 23px;
  }

  .piece-play-button {
    width: 100%;
  }

  .paragraph-list {
    padding: 0 16px;
  }

  .paragraph-row {
    padding: 21px 0 21px 42px;
  }

  .paragraph-row::before {
    left: 31px;
  }

  .paragraph-number {
    top: 20px;
    width: 27px;
    height: 27px;
  }

  .paragraph-english {
    font-size: 16px;
    line-height: 1.75;
  }

  .paragraph-chinese {
    font-size: 12px;
  }

  .grammar-summary {
    grid-template-columns: minmax(0, 1fr) 18px;
  }

  .grammar-tag {
    width: fit-content;
    grid-column: 1 / -1;
  }

  .grammar-body {
    padding: 0 13px 13px;
  }

  .extension-section {
    padding: 0 16px 20px;
  }

  .tip-block {
    padding: 13px 15px 15px;
  }

  .cue-block {
    padding: 10px 11px 11px;
  }

  .question-section {
    padding: 0 16px 20px;
  }

  .question-card {
    padding: 13px 13px 14px;
  }

  .question-stem {
    font-size: 14.5px;
  }

  .question-option {
    padding: 9px 10px;
    font-size: 13px;
  }

  .question-locate {
    margin-left: 0;
  }

  .question-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .question-submit {
    grid-column: 1 / -1;
  }

  .question-translation-toggle,
  .question-analysis-toggle {
    min-height: 34px;
  }

  .analysis-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .analysis-label {
    padding-top: 0;
  }

  .question-analysis {
    padding: 11px 11px 12px;
  }

  .word-panel-footnote {
    display: none;
  }
}

@media (max-width: 380px) {
  .intensive-topbar {
    grid-template-columns: 66px minmax(0, 1fr) 66px;
  }

  .topbar-link {
    font-size: 9px;
  }

  .hero-copy h1 {
    font-size: 29px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    transition-duration: 1ms !important;
  }

  .word-panel {
    animation: none;
  }
}