:root {
  --surface-canvas: #f6f1e8;
  --surface-paper: #fffdf8;
  --surface-ink: #1f2937;
  --surface-muted: #e9e0d2;
  --text-primary: #1d2433;
  --text-secondary: #556070;
  --text-inverse: #fffdf8;
  --accent-sun: #f2b544;
  --accent-sky: #6fa8dc;
  --accent-leaf: #6d9b6e;
  --accent-coral: #e6846e;
  --border-subtle: #d8ccba;
  --focus-ring: #2e6ee6;
  --shadow-card: 0 10px 30px rgba(29, 36, 51, 0.08);
  --shadow-float: 0 16px 48px rgba(29, 36, 51, 0.12);
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --radius-card: 0.5rem;
  --container: min(72rem, calc(100vw - 2rem));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", sans-serif;
  color: var(--text-primary);
  background:
    linear-gradient(180deg, rgba(255, 253, 248, 0.78), rgba(255, 253, 248, 0.96)),
    repeating-linear-gradient(
      135deg,
      rgba(233, 224, 210, 0.4) 0,
      rgba(233, 224, 210, 0.4) 1px,
      transparent 1px,
      transparent 18px
    ),
    var(--surface-canvas);
  line-height: 1.7;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

button,
input,
summary {
  font: inherit;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

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

.container {
  width: var(--container);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(246, 241, 232, 0.9);
  border-bottom: 1px solid rgba(216, 204, 186, 0.7);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 4.25rem;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.brand-mark img {
  width: clamp(8rem, 17vw, 10rem);
  height: auto;
}

.brand-mark__logo {
  display: block;
  width: clamp(8rem, 17vw, 10rem);
}

.brand-mark__logo svg {
  display: block;
  width: 100%;
  height: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.site-nav__links,
.footer-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.site-nav__link,
.footer-nav a {
  text-decoration: none;
  color: var(--text-secondary);
}

.site-nav__link[aria-current="page"] {
  color: var(--text-primary);
  font-weight: 700;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0 var(--space-5);
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  transition: transform 160ms ease-out, box-shadow 160ms ease-out, background-color 160ms ease-out;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button--primary {
  background: var(--surface-ink);
  color: var(--text-inverse);
  box-shadow: var(--shadow-card);
}

.button--secondary {
  background: transparent;
  color: var(--surface-ink);
  border-color: rgba(31, 41, 55, 0.12);
}

.menu-button {
  display: none;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid rgba(31, 41, 55, 0.12);
  border-radius: 999px;
  background: var(--surface-paper);
}

.menu-button span,
.menu-button::before,
.menu-button::after {
  display: block;
  width: 1rem;
  height: 2px;
  margin: 0 auto;
  background: var(--surface-ink);
  content: "";
}

.menu-button span {
  margin-top: 0.2rem;
  margin-bottom: 0.2rem;
}

.mobile-nav {
  display: none;
}

.mobile-nav[hidden] {
  display: none !important;
}

.section {
  padding: var(--space-8) 0;
}

.section--tight {
  padding: var(--space-7) 0;
}

.section-label {
  margin: 0 0 var(--space-3);
  color: var(--text-secondary);
  font-size: 0.875rem;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero {
  padding: var(--space-6) 0 var(--space-6);
}

.hero__grid,
.split-panel,
.reading-layout,
.about-layout {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-6);
  align-items: center;
}

.hero__grid {
  gap: var(--space-5);
  align-items: start;
}

.hero__copy,
.reading-layout__copy,
.about-layout__copy {
  grid-column: span 5;
}

.hero__visual,
.reading-layout__visual,
.about-layout__visual {
  grid-column: span 7;
}

.hero h1,
.page-intro h1 {
  margin: 0 0 var(--space-4);
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: clamp(2.4rem, 3.6vw, 3.65rem);
  line-height: 1.15;
}

.page-intro h1 {
  font-size: clamp(2rem, 3.5vw, 3.3rem);
}

.hero p,
.page-intro p,
.text-block p,
.info-card p,
.series-card p,
.step-card p,
.quote-panel p,
.cta-panel p,
.feature-list p {
  margin: 0;
  color: var(--text-secondary);
  max-width: 36rem;
}

.hero__copy {
  display: grid;
  gap: var(--space-3);
}

.hero__actions,
.page-intro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.hero__badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.hero__badge,
.page-pill,
.tag-list li {
  display: inline-flex;
  align-items: center;
  min-height: 2.25rem;
  padding: 0 var(--space-3);
  border-radius: 999px;
  background: rgba(255, 253, 248, 0.92);
  border: 1px solid rgba(216, 204, 186, 0.9);
  color: var(--text-secondary);
}

.hero-visual {
  position: relative;
  background: linear-gradient(135deg, rgba(111, 168, 220, 0.18), rgba(230, 132, 110, 0.18));
  border: 1px solid rgba(216, 204, 186, 0.9);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-float);
  padding: var(--space-5);
  max-width: 34rem;
  justify-self: end;
}

.hero-visual img {
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius-card);
}

.launch-visual {
  position: relative;
  overflow: hidden;
  display: grid;
  gap: var(--space-4);
  padding: var(--space-5);
  border-radius: var(--radius-card);
  border: 1px solid rgba(216, 204, 186, 0.9);
  background:
    radial-gradient(circle at top right, rgba(242, 181, 68, 0.28), transparent 36%),
    linear-gradient(140deg, rgba(111, 168, 220, 0.22), rgba(109, 155, 110, 0.14) 50%, rgba(255, 253, 248, 0.92));
  box-shadow: var(--shadow-card);
}

.launch-visual::after {
  content: "";
  position: absolute;
  right: -2rem;
  bottom: -2rem;
  width: 9rem;
  height: 9rem;
  border-radius: 50%;
  background: rgba(255, 253, 248, 0.26);
}

.launch-visual--hero {
  min-height: 24rem;
}

.launch-visual--wide {
  min-height: 22rem;
}

.launch-visual__header,
.launch-visual__list,
.launch-visual__grid,
.launch-visual__pill-row {
  position: relative;
  z-index: 1;
}

.launch-visual__header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.launch-visual__icon {
  width: clamp(3.5rem, 10vw, 4.5rem);
  height: auto;
  flex: none;
}

.launch-visual__icon--inline {
  display: block;
}

.launch-visual__icon--inline svg {
  display: block;
  width: 100%;
  height: auto;
}

.launch-visual__eyebrow,
.series-card__eyebrow {
  margin: 0 0 var(--space-2);
  color: var(--text-secondary);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.launch-visual h2 {
  margin: 0;
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: clamp(1.5rem, 2.2vw, 2rem);
  line-height: 1.25;
}

.launch-visual p {
  max-width: none;
}

.launch-visual__pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.launch-visual__pill-row span,
.series-card__art span {
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
  padding: 0 var(--space-3);
  border-radius: 999px;
  background: rgba(255, 253, 248, 0.78);
  border: 1px solid rgba(216, 204, 186, 0.85);
  color: var(--text-secondary);
}

.launch-visual__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.launch-visual__grid article,
.launch-visual__list article {
  background: rgba(255, 253, 248, 0.86);
  border: 1px solid rgba(216, 204, 186, 0.9);
  border-radius: var(--radius-card);
  padding: var(--space-4);
}

.launch-visual__list {
  display: grid;
  gap: var(--space-3);
}

.launch-visual__grid strong,
.launch-visual__list strong,
.series-card__art strong {
  display: block;
  margin-bottom: var(--space-2);
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 1.05rem;
  line-height: 1.35;
}

.hero-visual__caption {
  margin-top: var(--space-3);
}

.hero-visual__caption strong {
  display: block;
  margin-bottom: var(--space-1);
  font-size: 0.95rem;
}

.hero-visual__caption p {
  font-size: 0.92rem;
}

.grid-4,
.grid-3,
.grid-2 {
  display: grid;
  gap: var(--space-4);
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

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

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

.info-card,
.step-card,
.quote-panel,
.series-card,
.text-block,
.cta-panel,
.feature-list {
  background: rgba(255, 253, 248, 0.92);
  border: 1px solid rgba(216, 204, 186, 0.9);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

.info-card,
.step-card,
.text-block,
.feature-list {
  padding: var(--space-5);
}

.info-card h3,
.step-card h3,
.series-card h3,
.text-block h3,
.feature-list h3,
.cta-panel h2,
.quote-panel h2 {
  margin: 0 0 var(--space-3);
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 1.3rem;
  line-height: 1.35;
}

.quote-panel,
.feature-list {
  padding: var(--space-6);
}

.quote-panel {
  background:
    linear-gradient(135deg, rgba(109, 155, 110, 0.12), rgba(111, 168, 220, 0.12)),
    rgba(255, 253, 248, 0.96);
}

.step-card__index {
  margin: 0 0 var(--space-3);
  color: var(--accent-coral);
  font-weight: 700;
  font-size: 0.95rem;
}

.series-card {
  overflow: hidden;
}

.series-card__art {
  width: 100%;
  min-height: 14rem;
  display: grid;
  align-content: end;
  gap: var(--space-2);
  padding: var(--space-5);
  background:
    linear-gradient(155deg, rgba(255, 253, 248, 0), rgba(255, 253, 248, 0.18)),
    var(--surface-muted);
}

.series-card__art--sun {
  background-color: rgba(242, 181, 68, 0.22);
}

.series-card__art--sky {
  background-color: rgba(111, 168, 220, 0.24);
}

.series-card__art--leaf {
  background-color: rgba(109, 155, 110, 0.22);
}

.series-card__art span {
  justify-self: start;
}

.series-card__body {
  padding: var(--space-5);
}

.series-card__meta {
  margin-bottom: var(--space-3);
  font-size: 0.95rem;
}

.series-card__actions {
  margin-top: var(--space-4);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
}

.list-columns {
  columns: 2;
  gap: var(--space-6);
  margin: 0;
  padding-left: 1.25rem;
  color: var(--text-secondary);
}

.list-columns li + li,
.stack-list li + li {
  margin-top: var(--space-3);
}

.stack-list {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--text-secondary);
}

.faq-list {
  display: grid;
  gap: var(--space-3);
}

.faq-item {
  background: rgba(255, 253, 248, 0.92);
  border: 1px solid rgba(216, 204, 186, 0.9);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 0 var(--space-5);
}

.faq-item summary {
  padding: var(--space-4) 0;
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}

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

.faq-item p {
  padding: 0 0 var(--space-4);
}

.cta-panel {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-5);
  padding: var(--space-6);
  background:
    linear-gradient(135deg, rgba(242, 181, 68, 0.12), rgba(111, 168, 220, 0.12)),
    rgba(255, 253, 248, 0.96);
}

.cta-panel__content {
  grid-column: span 7;
}

.launch-path-grid {
  grid-column: span 5;
  display: grid;
  gap: var(--space-3);
}

.launch-path-card {
  padding: var(--space-5);
  background: rgba(255, 253, 248, 0.94);
  border: 1px solid rgba(216, 204, 186, 0.9);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

.launch-path-card--sky {
  background:
    linear-gradient(135deg, rgba(111, 168, 220, 0.16), rgba(255, 253, 248, 0.92)),
    rgba(255, 253, 248, 0.94);
}

.launch-path-card--sun {
  background:
    linear-gradient(135deg, rgba(242, 181, 68, 0.16), rgba(255, 253, 248, 0.92)),
    rgba(255, 253, 248, 0.94);
}

.launch-path-card__eyebrow,
.reader-page__number {
  margin: 0 0 var(--space-2);
  color: var(--text-secondary);
  font-size: 0.88rem;
  text-transform: uppercase;
}

.launch-path-card h3,
.reader-panel h2,
.reader-page h3 {
  margin: 0 0 var(--space-3);
  font-family: "Noto Serif SC", "Songti SC", serif;
  line-height: 1.35;
}

.launch-path-card__note,
.reader-page__cue,
.reader-aside__meta {
  margin-top: var(--space-3);
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.notify-form {
  grid-column: span 5;
  display: grid;
  gap: var(--space-3);
  align-content: start;
}

.notify-form label {
  display: grid;
  gap: var(--space-2);
  color: var(--text-secondary);
}

.notify-form input {
  min-height: 3rem;
  padding: 0 var(--space-4);
  border: 1px solid rgba(31, 41, 55, 0.16);
  border-radius: 999px;
  background: rgba(255, 253, 248, 0.75);
}

.notify-form select,
.notify-form textarea {
  min-height: 3rem;
  padding: 0.85rem var(--space-4);
  border: 1px solid rgba(31, 41, 55, 0.16);
  border-radius: 1.25rem;
  background: rgba(255, 253, 248, 0.75);
  font: inherit;
  color: var(--text-primary);
  resize: vertical;
}

.notify-form button:disabled,
.notify-form input:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.form-note {
  font-size: 0.9rem;
}

.form-status {
  min-height: 1.5rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.form-status[data-tone="success"] {
  color: #226b42;
}

.form-status[data-tone="error"] {
  color: #a23b30;
}

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

.site-footer {
  padding: var(--space-6) 0 var(--space-7);
  border-top: 1px solid rgba(216, 204, 186, 0.7);
}

.site-footer__inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-5);
}

.footer-note {
  max-width: 28rem;
  color: var(--text-secondary);
}

.page-intro {
  padding: var(--space-8) 0 var(--space-6);
}

.page-intro__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.reader-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(18rem, 0.9fr);
  gap: var(--space-5);
  align-items: start;
}

.reader-book,
.reader-aside__card {
  background: rgba(255, 253, 248, 0.94);
  border: 1px solid rgba(216, 204, 186, 0.92);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

.reader-book {
  padding: var(--space-5);
}

.reader-book__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.reader-pages {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.reader-page {
  padding: var(--space-4);
  border-radius: var(--radius-card);
  border: 1px solid rgba(216, 204, 186, 0.92);
}

.reader-page--sun {
  background: linear-gradient(145deg, rgba(242, 181, 68, 0.18), rgba(255, 253, 248, 0.95));
}

.reader-page--sky {
  background: linear-gradient(145deg, rgba(111, 168, 220, 0.18), rgba(255, 253, 248, 0.95));
}

.reader-page--leaf {
  background: linear-gradient(145deg, rgba(109, 155, 110, 0.18), rgba(255, 253, 248, 0.95));
}

.reader-page--coral {
  background: linear-gradient(145deg, rgba(230, 132, 110, 0.18), rgba(255, 253, 248, 0.95));
}

.reader-page__frame {
  padding: var(--space-5);
  border-radius: calc(var(--radius-card) - 0.1rem);
  background: rgba(255, 253, 248, 0.92);
  min-height: 14rem;
}

.reader-page__frame p {
  max-width: 32rem;
}

.reader-aside {
  display: grid;
  gap: var(--space-4);
}

.reader-aside__card {
  padding: var(--space-5);
}

.visual-stack {
  display: grid;
  gap: var(--space-4);
}

.visual-stack img {
  border-radius: var(--radius-card);
  border: 1px solid rgba(216, 204, 186, 0.9);
  box-shadow: var(--shadow-card);
}

@media (max-width: 959px) {
  .site-nav__links,
  .site-nav__cta {
    display: none;
  }

  .menu-button,
  .mobile-nav {
    display: block;
  }

  .mobile-nav {
    padding-bottom: var(--space-4);
  }

  .mobile-nav__panel {
    background: rgba(255, 253, 248, 0.96);
    border: 1px solid rgba(216, 204, 186, 0.9);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    padding: var(--space-4);
  }

  .mobile-nav__panel .site-nav__links,
  .mobile-nav__panel .site-nav__cta {
    display: grid;
    gap: var(--space-3);
  }

  .hero__grid,
  .split-panel,
  .reading-layout,
  .about-layout,
  .cta-panel,
  .site-footer__inner {
    grid-template-columns: 1fr;
    display: grid;
  }

  .hero__copy,
  .hero__visual,
  .reading-layout__copy,
  .reading-layout__visual,
  .about-layout__copy,
  .about-layout__visual,
  .cta-panel__content,
  .notify-form,
  .launch-path-grid {
    grid-column: auto;
  }

  .grid-4,
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .list-columns {
    columns: 1;
  }

  .hero {
    padding-top: var(--space-7);
  }

  .hero-visual {
    padding: var(--space-4);
    max-width: none;
    justify-self: stretch;
  }

  .launch-visual__header {
    align-items: flex-start;
  }

  .launch-visual__grid {
    grid-template-columns: 1fr;
  }

  .hero__actions .button,
  .page-intro__actions .button,
  .notify-form .button,
  .launch-path-card .button,
  .reader-aside .button {
    width: 100%;
  }

  .site-footer__inner {
    gap: var(--space-4);
  }

  .reader-panel {
    grid-template-columns: 1fr;
  }

  .reader-page__frame {
    min-height: auto;
  }
}

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

  .button {
    transition: none;
  }
}