:root {
  color-scheme: light;
  --color-canvas: #f7f4ed;
  --color-surface: #fffefa;
  --color-paper: #f1eee6;
  --color-paper-strong: #e8e4d8;
  --color-ink: #202421;
  --color-ink-soft: #3d423d;
  --color-muted: #6d716b;
  --color-faint: #9b9d96;
  --color-line: #d8d6ca;
  --color-line-strong: #b9b6a9;
  --color-line-subtle: #e9e5da;
  --color-pine: #315f72;
  --color-pine-soft: #dce8ec;
  --color-matsu: #4f6f5b;
  --color-matsu-soft: #dfe8dc;
  --color-indigo: #343a6e;
  --color-indigo-soft: #e0e2ef;
  --color-vermilion: #a64235;
  --color-vermilion-soft: #edd8d4;
  --color-ochre: #8a5a2c;
  --color-ochre-soft: #efe5c8;
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC",
    "Noto Sans JP", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    sans-serif;
  --font-reader: "Noto Serif SC", "Noto Serif JP", "Songti SC", "STSong",
    "Iowan Old Style", "Times New Roman", serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --site-max: 1160px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-ui);
  letter-spacing: 0;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    linear-gradient(90deg, rgb(216 214 202 / 0.45) 1px, transparent 1px) 0 0 / 48px 48px,
    var(--color-canvas);
}

body,
button,
a {
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button,
a {
  font: inherit;
}

button {
  cursor: pointer;
}

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

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

::selection {
  background: var(--color-pine-soft);
}

.skip-link {
  position: fixed;
  left: 16px;
  top: 12px;
  z-index: 20;
  transform: translateY(-140%);
  background: var(--color-ink);
  color: var(--color-surface);
  padding: 8px 12px;
  border-radius: var(--radius-md);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px max(24px, calc((100vw - var(--site-max)) / 2));
  border-bottom: 1px solid var(--color-line);
  background: rgb(247 244 237 / 0.94);
  backdrop-filter: blur(16px);
}

.brand,
.header-actions,
.language-switcher,
.brand-copy,
.hero-actions,
.card-topline {
  display: flex;
  align-items: center;
}

.brand {
  gap: 12px;
  min-width: 0;
}

.brand-mark,
.preview-logo {
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  overflow: hidden;
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-md);
  background: #050505;
}

.brand-mark img,
.preview-logo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand-copy {
  align-items: flex-start;
  flex-direction: column;
  gap: 2px;
}

.brand-copy strong {
  font-size: 16px;
  line-height: 1.2;
}

.brand-copy span {
  color: var(--color-muted);
  font-size: 12px;
  line-height: 1.3;
}

.header-actions {
  gap: 12px;
}

.language-switcher {
  min-height: 36px;
  padding: 3px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.language-switcher button {
  min-width: 38px;
  height: 28px;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 700;
}

.language-switcher button[aria-pressed="true"] {
  background: var(--color-pine-soft);
  color: var(--color-pine);
}

.header-waitlist {
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-pine);
  border-radius: var(--radius-md);
  background: var(--color-pine);
  color: var(--color-surface);
  padding: 0 14px;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}

.locale-panel {
  display: none;
}

.locale-panel.is-active {
  display: block;
}

.hero,
.pain-section,
.compare-section,
.ai-section,
.philosophy-section,
.waitlist-section {
  width: min(var(--site-max), calc(100% - 48px));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(420px, 1.05fr);
  gap: 52px;
  align-items: center;
  padding: 72px 0 60px;
}

.hero-copy {
  min-width: 0;
}

.kicker,
.section-label {
  margin: 0 0 14px;
  color: var(--color-pine);
  font-size: 13px;
  font-weight: 800;
  line-height: 1.5;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2 {
  font-family: var(--font-reader);
  font-weight: 700;
  letter-spacing: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 22px;
  font-size: 56px;
  line-height: 1.08;
}

.nowrap {
  white-space: nowrap;
}

.hero-lede {
  max-width: 660px;
  margin-bottom: 28px;
  color: var(--color-ink-soft);
  font-size: 18px;
  line-height: 1.85;
}

.hero-actions {
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 30px;
}

.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 0 18px;
  font-size: 14px;
  font-weight: 800;
  line-height: 1;
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease,
    transform 160ms ease;
}

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

.button-primary {
  border-color: var(--color-pine);
  background: var(--color-pine);
  color: var(--color-surface);
}

.button-primary:hover {
  background: #264f60;
}

.button-quiet {
  background: var(--color-surface);
  color: var(--color-pine);
}

.proof-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  border: 1px solid var(--color-line);
  background: var(--color-line);
}

.proof-row div {
  min-height: 88px;
  padding: 14px;
  background: rgb(255 254 250 / 0.78);
}

.proof-row dt {
  color: var(--color-muted);
  font-size: 12px;
  font-weight: 700;
}

.proof-row dd {
  margin: 6px 0 0;
  color: var(--color-ink);
  font-size: 14px;
  font-weight: 800;
  line-height: 1.45;
}

.reader-preview {
  position: relative;
  margin: 0;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  overflow: hidden;
}

.reader-preview::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border: 6px solid rgb(241 238 230 / 0.65);
}

.reader-preview {
  display: grid;
  grid-template-columns: 156px minmax(0, 1fr);
}

.preview-sidebar {
  min-height: 468px;
  padding: 24px 18px;
  border-right: 1px solid var(--color-line);
  background: var(--color-paper);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.preview-sidebar strong {
  font-size: 17px;
}

.preview-sidebar span {
  color: var(--color-muted);
  font-size: 12px;
  line-height: 1.4;
}

.preview-sidebar b {
  display: flex;
  align-items: center;
  min-height: 34px;
  margin-top: 6px;
  border: 1px solid var(--color-pine);
  border-radius: var(--radius-md);
  background: var(--color-pine-soft);
  color: var(--color-pine);
  padding: 0 10px;
  font-size: 13px;
}

.preview-sidebar b.muted {
  border-color: var(--color-line-subtle);
  background: var(--color-surface);
  color: var(--color-muted);
}

.preview-list {
  min-width: 0;
  padding: 28px 24px 78px;
}

.preview-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--color-line);
}

.preview-head strong {
  font-family: var(--font-reader);
  font-size: 30px;
  line-height: 1;
}

.preview-head span,
.article-row span {
  color: var(--color-muted);
  font-size: 12px;
}

.article-row {
  padding: 18px 14px;
  border-bottom: 1px solid var(--color-line-subtle);
  border-left: 3px solid transparent;
}

.article-row.selected {
  border-color: var(--color-pine);
  background: var(--color-pine-soft);
}

.article-row strong {
  display: block;
  margin-top: 6px;
  font-size: 16px;
  line-height: 1.45;
}

.article-row p {
  margin: 8px 0 0;
  color: var(--color-ink-soft);
  font-size: 13px;
  line-height: 1.6;
}

.reader-preview figcaption {
  position: absolute;
  left: 156px;
  right: 0;
  bottom: 0;
  min-height: 58px;
  padding: 13px 24px;
  border-top: 1px solid var(--color-line);
  background: rgb(255 254 250 / 0.94);
  color: var(--color-muted);
  font-size: 12px;
  line-height: 1.45;
}

.pain-section {
  padding: 34px 0 58px;
  border-top: 1px solid var(--color-line);
}

.pain-section h2,
.section-heading h2,
.waitlist-section h2 {
  margin-bottom: 16px;
  font-size: 34px;
  line-height: 1.2;
}

.pain-section p:not(.section-label),
.waitlist-section p:not(.section-label) {
  max-width: 820px;
  color: var(--color-ink-soft);
  font-size: 17px;
  line-height: 1.85;
}

.compare-section,
.ai-section,
.philosophy-section,
.waitlist-section {
  padding: 70px 0;
  border-top: 1px solid var(--color-line);
}

.section-heading {
  max-width: 780px;
  margin-bottom: 30px;
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 1px solid var(--color-line);
  background: var(--color-line);
  gap: 1px;
}

.comparison-card {
  min-height: 440px;
  padding: 24px;
  background: rgb(255 254 250 / 0.88);
}

.comparison-card.dibao {
  background: var(--color-pine-soft);
}

.card-topline {
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 26px;
  color: var(--color-muted);
  font-size: 13px;
}

.card-topline span {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-pine);
  font-family: var(--font-mono);
  font-weight: 800;
}

.comparison-card h3 {
  margin-bottom: 24px;
  font-size: 20px;
  line-height: 1.45;
}

.benefit-list,
.risk-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.risk-list {
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px solid var(--color-line);
}

.benefit-list li,
.risk-list li {
  position: relative;
  padding-left: 18px;
  color: var(--color-ink-soft);
  font-size: 14px;
  line-height: 1.65;
}

.benefit-list li::before,
.risk-list li::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-matsu);
}

.risk-list li::before {
  background: var(--color-vermilion);
}

.dibao .benefit-list li::before {
  background: var(--color-pine);
}

.ai-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 0.55fr);
  gap: 48px;
  align-items: start;
}

.ai-copy p {
  max-width: 780px;
  color: var(--color-ink-soft);
  font-size: 18px;
  line-height: 1.95;
}

.ai-table {
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  overflow: hidden;
}

.ai-row {
  display: grid;
  gap: 8px;
  padding: 18px;
  border-bottom: 1px solid var(--color-line);
}

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

.ai-row span {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 13px;
}

.ai-row b {
  color: var(--color-ink);
  font-size: 15px;
  line-height: 1.55;
}

.ai-row.stable {
  background: var(--color-pine-soft);
}

.ai-row.stable span,
.ai-row.stable b {
  color: var(--color-pine);
}

.philosophy-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(360px, 0.6fr);
  gap: 48px;
  align-items: start;
}

.philosophy-copy p {
  max-width: 760px;
  color: var(--color-ink-soft);
  font-size: 18px;
  line-height: 1.95;
}

.profile-ledger {
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  overflow: hidden;
}

.ledger-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  padding: 18px;
  border-bottom: 1px solid var(--color-line);
}

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

.ledger-row span {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 13px;
}

.ledger-row b {
  color: var(--color-ink);
  font-size: 14px;
}

.ledger-row.stable {
  background: var(--color-ink);
}

.ledger-row.stable span,
.ledger-row.stable b {
  color: var(--color-surface);
}

.waitlist-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 32px;
  align-items: center;
  padding-bottom: 86px;
}

@media (max-width: 980px) {
  .site-header {
    padding-inline: 20px;
  }

  .hero,
  .ai-layout,
  .philosophy-layout,
  .waitlist-section {
    grid-template-columns: 1fr;
  }

  .hero {
    gap: 34px;
    padding-top: 54px;
  }

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

  .comparison-card {
    min-height: 0;
  }
}

@media (max-width: 720px) {
  body {
    background: var(--color-canvas);
  }

  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
  }

  .hero,
  .pain-section,
  .compare-section,
  .ai-section,
  .philosophy-section,
  .waitlist-section {
    width: min(100% - 32px, var(--site-max));
  }

  h1 {
    font-size: 38px;
    line-height: 1.12;
  }

  .hero-lede,
  .ai-copy p,
  .philosophy-copy p {
    font-size: 16px;
    line-height: 1.78;
  }

  .pain-section h2,
  .section-heading h2,
  .waitlist-section h2 {
    font-size: 28px;
  }

  .proof-row {
    grid-template-columns: 1fr;
  }

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

  .preview-sidebar {
    min-height: 0;
    border-right: 0;
    border-bottom: 1px solid var(--color-line);
    display: grid;
    grid-template-columns: 42px 1fr;
    align-items: center;
  }

  .preview-sidebar b,
  .preview-sidebar span {
    display: none;
  }

  .preview-list {
    padding: 22px 18px 92px;
  }

  .preview-head strong {
    font-size: 24px;
  }

  .reader-preview figcaption {
    left: 0;
    padding-inline: 18px;
  }

  .comparison-card {
    padding: 20px;
  }

  .ledger-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (max-width: 460px) {
  .brand-copy span,
  .header-waitlist {
    display: none;
  }

  .language-switcher {
    width: 100%;
  }

  .language-switcher button {
    flex: 1;
  }

  .button {
    width: 100%;
  }

  .hero {
    padding-top: 42px;
  }
}

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

  .button {
    transition: none;
  }

  .button:hover {
    transform: none;
  }
}