:root {
  --ink: #202a24;
  --muted: rgba(32, 42, 36, .7);
  --on-image: rgba(255, 255, 255, .98);
  --on-image-muted: rgba(255, 255, 255, .82);
  --green: #35644a;
  --green-deep: #294f3a;
  --green-soft: #d7eadc;
  --gold: #855b2c;
  --border: rgba(62, 74, 66, .2);
  --border-image: rgba(255, 255, 255, .36);
  --display: rgba(252, 249, 241, .18);
  --control: rgba(255, 255, 255, .58);
  --reading: rgba(252, 249, 241, .92);
  --shadow: 0 18px 46px rgba(9, 17, 12, .2);
  --text-shadow: 0 1px 1px rgba(0, 0, 0, .56);
  --radius-panel: 20px;
  --radius-control: 12px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-serif: "Songti SC", "STSong", "SimSun", serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: #4a3d2f;
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

.wallpaper {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(90deg, rgba(31, 26, 20, .58), rgba(31, 26, 20, .18) 52%, rgba(31, 26, 20, .5)),
    linear-gradient(180deg, rgba(20, 17, 13, .09), rgba(20, 17, 13, .46)),
    url("../../suowen-preview/assets/learn.webp") center / cover no-repeat;
}

.wallpaper::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 42% 46%, rgba(236, 208, 154, .12), transparent 35%),
    linear-gradient(180deg, transparent 38%, rgba(13, 18, 14, .28));
}

.page {
  width: min(1500px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: 18px 24px 22px;
}

.glass-display,
.glass-control,
.glass-reading {
  border-radius: var(--radius-panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px) saturate(118%);
  -webkit-backdrop-filter: blur(18px) saturate(118%);
}

.glass-display {
  border: 1px solid var(--border-image);
  background: var(--display);
}

.glass-control {
  border: 1px solid rgba(255, 255, 255, .38);
  background: var(--control);
}

.glass-reading {
  border: 1px solid var(--border);
  background: var(--reading);
}

.on-image {
  color: var(--on-image);
  text-shadow: var(--text-shadow);
}

.topbar {
  min-height: 60px;
  display: grid;
  grid-template-columns: minmax(250px, 1fr) auto minmax(180px, 1fr);
  align-items: center;
  gap: 18px;
  padding: 8px 12px 8px 18px;
}

.brand {
  min-width: 0;
  display: flex;
  align-items: baseline;
  gap: 13px;
}

.brand strong {
  font: 600 18px/1 var(--font-serif);
  letter-spacing: .18em;
  white-space: nowrap;
}

.brand span {
  padding-left: 13px;
  border-left: 1px solid rgba(255, 255, 255, .38);
  color: var(--on-image-muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .14em;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border-radius: 13px;
  box-shadow: none;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.primary-nav a {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 7px 14px;
  border-radius: 9px;
  color: var(--ink);
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}

.primary-nav a:hover,
.primary-nav a:focus-visible {
  background: rgba(255, 255, 255, .58);
}

.primary-nav a.active {
  color: #fff;
  background: var(--green);
}

.back-link {
  justify-self: end;
  padding: 9px 4px;
  font-size: 12px;
}

.hero {
  min-height: 190px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 38px clamp(12px, 4vw, 62px) 28px;
}

.eyebrow,
.panel-kicker,
.card-kicker {
  display: block;
  margin-bottom: 8px;
  color: var(--green-soft);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .2em;
}

.hero h1 {
  margin: 0 0 12px;
  font: 600 clamp(40px, 5vw, 64px)/1.12 var(--font-serif);
  letter-spacing: .035em;
}

.hero p {
  max-width: 760px;
  margin: 0;
  color: var(--on-image-muted);
  font: 15px/1.8 var(--font-serif);
  letter-spacing: .025em;
}

.reading-workbench {
  display: grid;
  grid-template-columns: minmax(210px, 240px) minmax(480px, 1fr) minmax(280px, 330px);
  gap: 18px;
  align-items: stretch;
}

.route-panel,
.memory-panel,
.classic-panel {
  min-width: 0;
  min-height: 490px;
  padding: 20px;
}

.route-panel h2,
.section-heading h2 {
  margin: 0;
  font: 600 22px/1.25 var(--font-serif);
  letter-spacing: .07em;
}

.route-panel ol {
  display: flex;
  flex-direction: column;
  gap: 7px;
  margin: 20px 0 18px;
  padding: 0;
  list-style: none;
}

.route-panel li {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 10px;
  padding: 13px 10px;
  border: 1px solid transparent;
  border-radius: 12px;
  color: var(--on-image-muted);
}

.route-panel li.current {
  border-color: rgba(255, 255, 255, .35);
  background: rgba(255, 255, 255, .12);
}

.route-panel li > span {
  color: var(--green-soft);
  font: 600 15px var(--font-serif);
}

.route-panel strong {
  display: block;
  color: var(--on-image);
  font: 600 14px var(--font-serif);
  letter-spacing: .05em;
}

.route-panel p {
  margin: 5px 0 0;
  font-size: 11px;
  line-height: 1.6;
}

.route-home {
  min-height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  color: var(--ink);
  font-size: 12px;
  font-weight: 700;
  text-shadow: none;
}

.memory-panel,
.classic-panel {
  color: var(--ink);
}

.memory-panel .panel-kicker,
.classic-panel .panel-kicker,
.featured-card .card-kicker {
  color: var(--green);
  text-shadow: none;
}

.section-heading {
  min-height: 52px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 14px;
}

.section-note {
  padding: 5px 8px;
  border: 1px solid rgba(53, 100, 74, .28);
  border-radius: 999px;
  color: var(--green);
  font-size: 10px;
  white-space: nowrap;
}

.featured-card {
  display: grid;
  grid-template-columns: minmax(180px, .8fr) minmax(0, 1.2fr);
  min-height: 230px;
  overflow: hidden;
  border: 1px solid rgba(53, 100, 74, .2);
  border-radius: 16px;
  background: rgba(255, 255, 255, .42);
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}

.featured-image {
  min-height: 230px;
  display: flex;
  align-items: flex-end;
  padding: 14px;
  background:
    linear-gradient(180deg, rgba(15, 22, 17, .03), rgba(15, 22, 17, .6)),
    url("../../assets/home/feature-shanghan.webp") center / cover no-repeat;
}

.featured-image span {
  padding: 5px 8px;
  border: 1px solid rgba(255, 255, 255, .32);
  border-radius: 999px;
  color: #fff;
  background: rgba(15, 22, 17, .44);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: .08em;
  text-shadow: var(--text-shadow);
}

.featured-copy {
  min-width: 0;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  align-content: center;
  gap: 0 12px;
  padding: 20px;
}

.card-mark,
.classic-mark {
  display: grid;
  place-items: center;
  color: #f7f2e8;
  background: var(--green);
  font-family: var(--font-serif);
}

.card-mark {
  width: 42px;
  height: 54px;
  grid-row: 1 / span 2;
  border-radius: 7px 7px 12px 12px;
  font-size: 20px;
}

.featured-copy h3,
.memory-card h3,
.classic-list h3 {
  margin: 0;
  font: 600 19px/1.3 var(--font-serif);
  letter-spacing: .06em;
}

.featured-copy p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.7;
}

.featured-copy > strong {
  grid-column: 2;
  margin-top: 15px;
  color: var(--green);
  font-size: 12px;
}

.memory-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.memory-card {
  min-width: 0;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 0 11px;
  padding: 14px;
  border-radius: 14px;
  color: var(--ink);
  box-shadow: none;
}

.memory-card .card-mark {
  width: 38px;
  height: 48px;
  font-size: 17px;
}

.memory-card p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.55;
}

.memory-card > strong {
  grid-column: 2;
  margin-top: 9px;
  color: var(--green);
  font-size: 10px;
}

.featured-card:hover,
.featured-card:focus-visible,
.memory-card:hover,
.memory-card:focus-visible,
.classic-list a:hover,
.classic-list a:focus-visible {
  transform: translateY(-3px);
  background: rgba(255, 255, 255, .74);
  box-shadow: 0 14px 30px rgba(24, 36, 28, .13);
}

.classic-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.classic-list a {
  min-height: 82px;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) 12px;
  align-items: center;
  gap: 11px;
  padding: 12px;
  border: 1px solid rgba(53, 100, 74, .16);
  border-radius: 13px;
  background: rgba(255, 255, 255, .46);
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}

.classic-mark {
  width: 38px;
  height: 48px;
  border-radius: 7px 7px 12px 12px;
  font-size: 16px;
}

.classic-list p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.55;
}

.classic-list a > strong {
  color: var(--green);
  font: 24px/1 var(--font-serif);
}

.classic-note {
  margin-top: 14px;
  padding: 13px 14px;
  border-left: 3px solid var(--gold);
  background: rgba(133, 91, 44, .07);
}

.classic-note span {
  color: var(--gold);
  font-size: 10px;
  font-weight: 700;
}

.classic-note p {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.65;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  padding: 18px 5px 0;
  color: var(--on-image-muted);
  font-size: 11px;
}

.site-footer strong {
  color: var(--on-image);
  font: 600 14px var(--font-serif);
  letter-spacing: .12em;
}

.site-footer p {
  margin: 0;
}

a:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 3px;
}

@media (max-width: 1180px) {
  .topbar {
    grid-template-columns: 1fr auto;
  }

  .primary-nav {
    order: 3;
    grid-column: 1 / -1;
    justify-self: center;
  }

  .reading-workbench {
    grid-template-columns: minmax(200px, 230px) minmax(0, 1fr);
  }

  .classic-panel {
    grid-column: 1 / -1;
    min-height: 0;
  }

  .classic-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 780px) {
  .page {
    padding: 12px 12px 24px;
  }

  .topbar {
    min-height: 56px;
    gap: 8px;
    padding: 8px 10px;
  }

  .brand span,
  .back-link {
    display: none;
  }

  .primary-nav {
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
  }

  .primary-nav a {
    flex: 0 0 auto;
  }

  .hero {
    min-height: 220px;
    padding: 48px 4px 28px;
  }

  .hero h1 {
    font-size: clamp(38px, 12vw, 52px);
  }

  .reading-workbench,
  .classic-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .route-panel,
  .memory-panel,
  .classic-panel {
    min-height: 0;
    padding: 17px;
  }

  .route-panel {
    order: 2;
  }

  .memory-panel {
    order: 1;
  }

  .classic-panel {
    order: 3;
    grid-column: auto;
  }

  .featured-card {
    grid-template-columns: 1fr;
  }

  .featured-image {
    min-height: 170px;
  }

  .memory-grid {
    grid-template-columns: 1fr;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

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

  *,
  *::before,
  *::after {
    transition: none !important;
  }
}