:root {
  --ink: #23221e;
  --muted: #716e65;
  --line: rgba(46, 43, 35, 0.14);
  --panel: #fffdf8;
  --paper: #f8f3e9;
  --bg: #eee8dc;
  --accent: #a43b2a;
  --accent-dark: #74281d;
  --reward: #cc8b32;
  --good: #47704f;
  --warn: #b53127;
  --guide: rgba(164, 59, 42, 0.18);
  --shadow: 0 18px 50px rgba(57, 47, 30, 0.09);
  color-scheme: light;
}

.home-return {
  position: fixed;
  right: 18px;
  top: 17px;
  z-index: 20;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 12px;
  background: rgba(255, 253, 248, 0.9);
  color: var(--accent);
  font-size: 11px;
  font-weight: 800;
  text-decoration: none;
  backdrop-filter: blur(8px);
}

* {
  scrollbar-color: rgba(164, 59, 42, 0.28) transparent;
  scrollbar-width: thin;
}

body {
  position: relative;
  background:
    radial-gradient(circle at 16% 8%, rgba(255, 255, 255, 0.85), transparent 34%),
    linear-gradient(135deg, #f4f0e8 0%, #ece5d8 100%);
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  opacity: 0.24;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 120 120' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.08'/%3E%3C/svg%3E");
}

main {
  width: min(100%, 1680px);
  margin: 0 auto;
  grid-template-columns: minmax(280px, 320px) minmax(420px, 1fr) minmax(260px, 310px);
  grid-template-rows: 64px minmax(150px, auto) minmax(0, 1fr) auto;
  grid-template-areas:
    "header header header"
    "menu mission lesson"
    "menu characters lesson"
    "menu characters note";
  gap: 16px;
  padding: 14px 18px 18px;
}

.site-header {
  grid-area: header;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 20px;
  border-bottom: 1px solid var(--line);
  padding: 0 4px 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
}

.brand-seal {
  display: grid;
  width: 38px;
  aspect-ratio: 1;
  place-items: center;
  border-radius: 9px 9px 9px 2px;
  background: var(--accent);
  color: #fffaf0;
  font-family: "Songti SC", "STSong", serif;
  font-size: 24px;
  font-weight: 700;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.28);
}

.brand-seal img {
  display: block;
  width: 78%;
  height: 78%;
  object-fit: contain;
  filter: invert(1);
}

.brand-name {
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.09em;
}

.brand-name span {
  color: var(--accent);
}

.brand-promise {
  margin: 0;
  color: var(--muted);
  font-family: "Songti SC", "STSong", serif;
  font-size: 15px;
  letter-spacing: 0.08em;
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.header-meta i {
  color: var(--accent);
  font-style: normal;
}

aside,
.mission-card,
.lesson-panel,
.character-card,
.note,
.empty {
  border-color: var(--line);
  background: rgba(255, 253, 248, 0.9);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

aside {
  height: auto;
  border-radius: 20px 20px 20px 5px;
  padding: 22px;
}

.sidebar-intro {
  padding: 2px 2px 15px;
  border-bottom: 1px solid var(--line);
}

.eyebrow,
.mission-kicker {
  margin: 0 0 9px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1,
.mission-card h2,
.lesson-panel h3 {
  font-family: "Songti SC", "STSong", "SimSun", serif;
}

h1 {
  margin-bottom: 12px;
  color: #26231d;
  font-size: 30px;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.32;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.75;
}

.coach-card,
.route-card,
.manual-card {
  border: 0;
  border-top: 1px solid var(--line);
  border-radius: 0;
  margin-top: 18px;
  padding: 18px 0 0;
  background: transparent;
}

.coach-card {
  border-top: 0;
  margin-top: 3px;
}

.coach-title,
.route-title,
label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.08em;
}

.section-mark {
  display: inline-grid;
  min-width: 25px;
  height: 25px;
  place-items: center;
  border-radius: 50%;
  background: rgba(164, 59, 42, 0.09);
  color: var(--accent);
  font-family: Georgia, serif;
  font-size: 10px;
  letter-spacing: 0;
}

.coach-message {
  min-height: 0;
  font-size: 13px;
  line-height: 1.6;
}

.stats {
  gap: 7px;
}

.stat {
  border-color: var(--line);
  border-radius: 12px 12px 12px 3px;
  padding: 9px 10px;
  background: rgba(255, 255, 255, 0.52);
}

.stat strong {
  color: var(--accent);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 23px;
  font-weight: 500;
}

.stat span {
  margin-top: 4px;
  font-size: 11px;
}

button {
  min-height: 38px;
  border-color: var(--line);
  border-radius: 10px 10px 10px 3px;
  background: rgba(255, 255, 255, 0.7);
  color: var(--ink);
  font-size: 13px;
  font-weight: 750;
  transition: transform 150ms ease, border-color 150ms ease, background 150ms ease, box-shadow 150ms ease;
}

button:hover {
  border-color: rgba(164, 59, 42, 0.42);
  background: #fff;
  transform: translateY(-1px);
}

button.primary {
  border-color: var(--accent);
  background: var(--accent);
  box-shadow: 0 8px 18px rgba(164, 59, 42, 0.2);
}

button.primary:hover {
  background: var(--accent-dark);
}

button[aria-pressed="true"] {
  border-color: rgba(164, 59, 42, 0.45);
  background: rgba(164, 59, 42, 0.07);
  box-shadow: none;
}

.route-list {
  gap: 7px;
}

.route-list li {
  grid-template-columns: 63px 1fr;
  font-size: 12px;
}

textarea {
  min-height: 74px;
  border-color: var(--line);
  border-radius: 12px 12px 12px 3px;
  background: rgba(255, 255, 255, 0.72);
  font-family: "Songti SC", "STSong", serif;
}

textarea:focus,
button:focus-visible {
  outline-color: rgba(164, 59, 42, 0.2);
}

.mission-card {
  position: relative;
  border-radius: 20px 20px 6px 20px;
  padding: 21px 22px;
  overflow: hidden;
}

.mission-card::after {
  position: absolute;
  right: 18px;
  bottom: -32px;
  content: "永";
  color: rgba(164, 59, 42, 0.055);
  font-family: "Songti SC", "STSong", serif;
  font-size: 142px;
  line-height: 1;
  pointer-events: none;
}

.mission-card > * {
  position: relative;
  z-index: 1;
}

.mission-card h2 {
  max-width: 620px;
  font-size: clamp(24px, 2.3vw, 36px);
  font-weight: 650;
  line-height: 1.22;
}

.mission-subtitle {
  max-width: 660px;
  font-size: 13px;
}

.mission-actions {
  grid-template-columns: repeat(2, minmax(110px, 1fr));
}

.lesson-panel {
  border-radius: 20px 20px 20px 6px;
  padding: 22px;
}

.lesson-panel h3 {
  font-size: 22px;
  font-weight: 650;
}

.lesson-copy {
  font-size: 13px;
  line-height: 1.75;
}

.focus-line {
  min-height: 126px;
  border: 0;
  border-radius: 14px 14px 14px 4px;
  background:
    linear-gradient(90deg, transparent 49.7%, rgba(164, 59, 42, 0.13) 50%, transparent 50.3%),
    linear-gradient(0deg, transparent 49.7%, rgba(164, 59, 42, 0.13) 50%, transparent 50.3%),
    #faf3e7;
  color: var(--accent-dark);
  font-family: "Songti SC", "STSong", serif;
  font-size: 23px;
  font-weight: 650;
}

.chip {
  min-height: 27px;
  border-color: var(--line);
  background: transparent;
  font-size: 11px;
}

.characters {
  gap: 18px;
  padding: 4px max(14px, calc((100% - 448px) / 2));
  scroll-padding-inline: max(14px, calc((100% - 448px) / 2));
}

.character-card {
  flex-basis: min(100%, 448px);
  border-radius: 22px 22px 22px 6px;
  padding: 17px;
}

.char {
  color: var(--accent);
  font-family: "Songti SC", "STSong", serif;
  font-size: 34px;
  font-weight: 650;
}

.writer {
  border: 0;
  border-radius: 16px 16px 16px 4px;
  background:
    linear-gradient(45deg, transparent 49.7%, var(--guide) 50%, transparent 50.3%),
    linear-gradient(-45deg, transparent 49.7%, var(--guide) 50%, transparent 50.3%),
    linear-gradient(90deg, transparent 49.7%, var(--guide) 50%, transparent 50.3%),
    linear-gradient(0deg, transparent 49.7%, var(--guide) 50%, transparent 50.3%),
    #faf6ee;
  box-shadow: inset 0 0 0 1px rgba(164, 59, 42, 0.12);
}

.progress {
  background: rgba(113, 110, 101, 0.12);
}

.progress-fill {
  background: linear-gradient(90deg, var(--accent), var(--reward));
}

.word-panel {
  border-color: rgba(164, 59, 42, 0.2);
  border-radius: 12px 12px 12px 3px;
  background: #fbf2e7;
}

.word-panel strong {
  color: var(--accent-dark);
}

.word-pill {
  border-color: rgba(164, 59, 42, 0.2);
}

.empty {
  border-radius: 20px 20px 20px 6px;
}

.note {
  border-radius: 14px 14px 14px 4px;
  padding: 12px 15px;
  font-size: 12px;
}

@media (max-width: 1180px) {
  main {
    grid-template-columns: minmax(270px, 300px) minmax(0, 1fr);
    grid-template-rows: 62px minmax(148px, auto) minmax(0, 1fr) auto;
    grid-template-areas:
      "header header"
      "menu mission"
      "menu characters"
      "menu note";
  }

  .lesson-panel {
    display: none;
  }
}

@media (max-width: 920px) {
  body {
    overflow: hidden;
  }

  main {
    width: 100%;
    height: 100svh;
    min-height: 100svh;
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: 52px 124px minmax(0, 1fr) 148px;
    grid-template-areas:
      "header"
      "mission"
      "characters"
      "menu";
    gap: 9px;
    padding: 8px;
  }

  .site-header {
    padding: 0 3px 8px;
  }

  .brand-seal {
    width: 32px;
    font-size: 20px;
  }

  .brand-name {
    font-size: 15px;
  }

  .brand-promise {
    display: none;
  }

  .header-meta {
    gap: 6px;
    font-size: 10px;
  }

  aside {
    grid-area: menu;
    width: auto;
    height: 148px;
    display: grid;
    grid-template-columns: 156px;
    grid-auto-flow: column;
    grid-auto-columns: minmax(205px, 1fr);
    gap: 8px;
    overflow-x: auto;
    overflow-y: hidden;
    border-radius: 15px 15px 15px 4px;
    padding: 9px;
  }

  .sidebar-intro {
    display: flex;
    height: 128px;
    align-items: center;
    border: 0;
    padding: 9px;
  }

  .sidebar-intro .eyebrow,
  .sidebar-intro .subtitle {
    display: none;
  }

  h1 {
    width: auto;
    height: auto;
    margin: 0;
    font-size: 20px;
  }

  .coach-card,
  .route-card,
  .manual-card {
    height: 128px;
    overflow-y: auto;
    border: 0;
    margin: 0;
    padding: 9px;
    background: rgba(255, 255, 255, 0.45);
    border-radius: 11px 11px 11px 3px;
  }

  .mission-card {
    grid-area: mission;
    max-height: none;
    grid-template-columns: 1fr auto;
    align-items: end;
    padding: 14px 16px;
    gap: 12px;
    border-radius: 15px 15px 5px 15px;
  }

  .mission-card h2 {
    font-size: 21px;
  }

  .mission-actions {
    width: 210px;
  }

  .characters {
    grid-area: characters;
    height: 100%;
    padding-inline: max(8px, calc((100% - 390px) / 2));
    scroll-padding-inline: max(8px, calc((100% - 390px) / 2));
  }

  .character-card {
    flex-basis: min(100%, 390px);
    border-radius: 16px 16px 16px 5px;
  }

  .writer {
    width: min(100%, 43svh, 370px);
  }

  .note,
  .lesson-panel {
    display: none;
  }
}

@media (max-width: 580px) {
  main {
    grid-template-rows: 48px 118px minmax(0, 1fr) 116px;
    gap: 7px;
    padding: 7px;
  }

  .header-meta span:nth-of-type(2),
  .header-meta span:nth-of-type(3),
  .header-meta i {
    display: none;
  }

  aside {
    height: 116px;
    grid-template-columns: 132px;
    grid-auto-columns: 194px;
    padding: 7px;
  }

  .sidebar-intro,
  .coach-card,
  .route-card,
  .manual-card {
    height: 100px;
    padding: 7px;
  }

  .coach-title,
  .route-title {
    margin-bottom: 5px;
  }

  h1 {
    font-size: 17px;
  }

  .mission-card {
    display: grid;
    grid-template-columns: 1fr;
    align-items: start;
    padding: 11px 12px;
    gap: 6px;
  }

  .mission-card h2 {
    font-size: 19px;
  }

  .mission-card::after {
    font-size: 100px;
  }

  .mission-subtitle {
    display: none;
  }

  .mission-actions {
    width: 100%;
  }

  .mission-actions button {
    min-height: 34px;
    font-size: 12px;
  }

  .characters {
    padding-inline: max(6px, calc((100% - 344px) / 2));
    scroll-padding-inline: max(6px, calc((100% - 344px) / 2));
  }

  .character-card {
    flex-basis: min(100%, 344px);
    padding: 10px;
  }

  .writer {
    width: min(100%, 39svh, 310px);
  }

  .char-top {
    margin-bottom: 5px;
  }

  .char {
    font-size: 28px;
  }

  .card-actions button {
    min-height: 36px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}