:root {
  --color-canvas: #f1f7f4;
  --color-surface: #ffffff;
  --color-surface-soft: #e4f0e7;
  --color-surface-warm: #f7f9f7;
  --color-ink: #102621;
  --color-ink-muted: #4d635d;
  --color-ink-inverse: #f8fbf7;
  --color-border: #cadbd5;
  --color-accent: #0b725f;
  --color-accent-strong: #075a4b;
  --color-accent-soft: #d7ece3;
  --color-focus: #ee9b4e;
  --color-image-overlay: rgba(16, 38, 33, 0.58);
  --color-shadow-hairline: rgba(16, 38, 33, 0.03);
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --radius-sm: 10px;
  --radius-md: 20px;
  --radius-lg: 20px;
  --shadow-soft: 0 18px 48px rgba(16, 38, 33, 0.12);
  --shadow-card: 0 10px 28px rgba(16, 38, 33, 0.08);
  --type-display: clamp(2.75rem, 5.5vw, 4.75rem);
  --type-h2: clamp(2rem, 4vw, 3.25rem);
  --type-lead: clamp(1.125rem, 2vw, 1.25rem);
  --type-body: 1.0625rem;
  --type-small: 0.875rem;
  --type-label: 0.75rem;
  --font-sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", "Noto Sans JP", "PingFang TC", "Hiragino Sans", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--color-canvas);
}

body {
  margin: 0;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: var(--type-body);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
}

h1,
h2,
h3,
p,
a,
span,
strong {
  overflow-wrap: anywhere;
}

button,
select {
  color: inherit;
  font: inherit;
}

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

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 4px;
}

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

.skip-link {
  position: fixed;
  z-index: 20;
  top: var(--space-3);
  left: var(--space-3);
  transform: translateY(-180%);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  background: var(--color-ink);
  color: var(--color-ink-inverse);
  font-size: var(--type-small);
  font-weight: 700;
  text-decoration: none;
  transition: transform 160ms ease-out;
}

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

.shell {
  width: min(1240px, calc(100% - (var(--space-6) * 2)));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  background: color-mix(in srgb, var(--color-canvas) 92%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--color-border) 72%, transparent);
  backdrop-filter: blur(18px);
}

.header-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-8);
  min-height: 76px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 45px;
  color: var(--color-ink);
  font-size: 0.96rem;
  font-weight: 750;
  letter-spacing: -0.025em;
  text-decoration: none;
  white-space: nowrap;
}

.brand b {
  font-weight: 800;
}

.brand-mark {
  display: inline-block;
  width: 17px;
  height: 17px;
  border: 3px solid var(--color-accent);
  border-radius: 50% 50% 50% 8px;
  transform: rotate(-45deg);
}

.main-nav {
  display: flex;
  justify-content: center;
  gap: clamp(var(--space-4), 3vw, var(--space-8));
}

.main-nav a,
.footer-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 45px;
  padding-inline: var(--space-2);
  color: var(--color-ink-muted);
  font-size: var(--type-small);
  font-weight: 650;
  text-decoration: none;
  transition: color 140ms ease-out;
}

.main-nav a:hover,
.main-nav a:focus-visible,
.footer-nav a:hover,
.footer-nav a:focus-visible {
  color: var(--color-accent-strong);
}

.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-4);
}

.language-control {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-ink-muted);
}

.language-glyph {
  display: inline-grid;
  width: 25px;
  height: 25px;
  place-items: center;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  font-size: var(--type-small);
  font-weight: 700;
}

.language-glyph svg {
  width: 15px;
  height: 15px;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.language-control select {
  min-height: 45px;
  min-width: 76px;
  padding: var(--space-2) var(--space-3);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  font-size: var(--type-small);
  font-weight: 650;
  cursor: pointer;
}

.language-control select:hover {
  border-color: var(--color-border);
  background: var(--color-surface);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: var(--space-3) var(--space-6);
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: var(--type-small);
  font-weight: 750;
  line-height: 1.2;
  text-decoration: none;
  transition: transform 140ms ease-out, background-color 140ms ease-out, color 140ms ease-out, border-color 140ms ease-out;
}

.button-small {
  min-height: 45px;
  padding-inline: var(--space-4);
}

.button-primary {
  background: var(--color-accent);
  color: var(--color-ink-inverse);
}

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

.button-light {
  background: var(--color-ink-inverse);
  color: var(--color-ink);
}

.button-light:hover {
  background: var(--color-surface-soft);
}

.button:active,
.text-link:active {
  transform: translateY(1px);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 45px;
  padding-block: var(--space-2);
  width: fit-content;
  color: var(--color-ink);
  font-size: var(--type-small);
  font-weight: 750;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: color 140ms ease-out, transform 140ms ease-out;
}

.text-link:hover {
  color: var(--color-accent-strong);
}

.text-link span {
  font-size: 1.1em;
  text-decoration: none;
}

.menu-toggle {
  display: none;
  align-items: center;
  gap: var(--space-3);
  min-height: 45px;
  padding: var(--space-2) 0;
  border: 0;
  background: transparent;
  font-size: var(--type-small);
  font-weight: 700;
  cursor: pointer;
}

.menu-icon {
  display: grid;
  gap: 4px;
}

.menu-icon i {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 180ms ease-in-out;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  align-items: center;
  gap: clamp(var(--space-8), 7vw, var(--space-16));
  min-height: 100dvh;
  padding-block: clamp(var(--space-12), 9vw, var(--space-24));
}

.hero-copy {
  max-width: 620px;
}

.eyebrow,
.cta-kicker,
.thread-label,
.data-panel-label,
.persona-role,
.lesson-duration {
  margin: 0;
  color: var(--color-accent-strong);
  font-size: var(--type-label);
  font-weight: 800;
  letter-spacing: 0.08em;
  line-height: 1.3;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 13ch;
  margin: var(--space-4) 0 var(--space-6);
  font-size: var(--type-display);
  font-weight: 800;
  letter-spacing: -0.075em;
  line-height: 1.02;
  overflow-wrap: anywhere;
}

.hero-lead {
  max-width: 50ch;
  margin: 0;
  color: var(--color-ink-muted);
  font-size: var(--type-lead);
  font-weight: 500;
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-5);
  margin-top: var(--space-8);
}

.trust-note {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-8);
  color: var(--color-ink-muted);
  font-size: var(--type-small);
  font-weight: 650;
}

.trust-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 5px var(--color-accent-soft);
}

.hero-visual {
  position: relative;
  margin: 0;
}

.hero-image-wrap {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg) var(--radius-lg) 8px var(--radius-lg);
  background: var(--color-surface-soft);
  box-shadow: var(--shadow-soft);
}

.hero-image-wrap::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 34%;
  background: linear-gradient(180deg, transparent, var(--color-image-overlay));
  content: "";
  pointer-events: none;
}

.hero-image-wrap img {
  width: 100%;
  aspect-ratio: 1600 / 844;
  object-fit: cover;
}

.image-stamp {
  position: absolute;
  z-index: 1;
  right: var(--space-6);
  bottom: var(--space-6);
  max-width: 12ch;
  color: var(--color-ink-inverse);
  font-size: clamp(1.25rem, 3vw, 2.2rem);
  font-weight: 750;
  letter-spacing: -0.045em;
  line-height: 1.05;
  text-align: right;
}

.hero-visual figcaption {
  max-width: 34ch;
  margin: var(--space-4) 0 0 auto;
  color: var(--color-ink-muted);
  font-size: var(--type-small);
  font-weight: 600;
  line-height: 1.5;
  text-align: right;
}

.section {
  padding-block: clamp(var(--space-16), 9vw, var(--space-24));
}

.section-empathy {
  background: var(--color-surface-soft);
  border-block: 1px solid var(--color-border);
}

.section-intro {
  max-width: 760px;
}

.section-intro-narrow {
  max-width: 620px;
}

.section-intro h2 {
  max-width: 15ch;
  margin: 0;
  font-size: var(--type-h2);
  font-weight: 780;
  letter-spacing: -0.06em;
  line-height: 1.08;
  overflow-wrap: anywhere;
}

.section-intro p {
  max-width: 58ch;
  margin: var(--space-5) 0 0;
  color: var(--color-ink-muted);
  font-size: var(--type-lead);
  font-weight: 500;
  line-height: 1.55;
}

.empathy-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(260px, 0.88fr);
  gap: clamp(var(--space-8), 7vw, var(--space-16));
  align-items: center;
  margin-top: var(--space-12);
}

.thread-card {
  padding: clamp(var(--space-6), 4vw, var(--space-10));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.thread-topline,
.persona-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.thread-status {
  padding: var(--space-2) var(--space-3);
  border-radius: 999px;
  background: var(--color-accent-soft);
  color: var(--color-accent-strong);
  font-size: var(--type-label);
  font-weight: 750;
  line-height: 1.3;
}

.message {
  max-width: 90%;
  margin-top: var(--space-8);
  padding: var(--space-5) var(--space-6);
  border-radius: var(--radius-md);
}

.message-user {
  margin-right: auto;
  border: 1px solid var(--color-border);
  background: var(--color-canvas);
}

.message-guardian {
  margin-left: auto;
  background: var(--color-ink);
  color: var(--color-ink-inverse);
}

.message-speaker {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--color-ink-muted);
  font-size: var(--type-small);
  font-weight: 750;
}

.message-guardian .message-speaker {
  color: var(--color-accent-soft);
}

.message p {
  margin: 0;
  font-size: clamp(1rem, 2vw, 1.1rem);
  font-weight: 560;
  line-height: 1.5;
}

.message-tag {
  display: block;
  margin-top: var(--space-4);
  color: var(--color-accent-soft);
  font-size: var(--type-label);
  font-weight: 750;
  letter-spacing: 0.04em;
}

.empathy-note {
  position: relative;
  padding-left: var(--space-8);
}

.note-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 4px;
  border-radius: 4px;
  background: var(--color-accent);
}

.empathy-note h3 {
  max-width: 14ch;
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 780;
  letter-spacing: -0.055em;
  line-height: 1.08;
  overflow-wrap: anywhere;
}

.empathy-note p {
  max-width: 34ch;
  margin: var(--space-5) 0 var(--space-6);
  color: var(--color-ink-muted);
  font-weight: 500;
}

.section-lessons {
  background: var(--color-surface-warm);
}

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-5);
  margin-top: var(--space-12);
}

.lesson-card {
  min-height: 280px;
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: 0 1px 0 var(--color-shadow-hairline);
  transition: transform 180ms ease-out, box-shadow 180ms ease-out;
}

.lesson-card:hover,
.lesson-card:focus-within {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.lesson-card-mint {
  background: var(--color-surface-soft);
}

.lesson-card-coral {
  background: var(--color-accent-soft);
}

.lesson-card-ink {
  background: var(--color-ink);
  color: var(--color-ink-inverse);
}

.lesson-card summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: var(--space-4);
  min-height: 45px;
  overflow-wrap: anywhere;
  list-style: none;
  cursor: pointer;
}

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

.lesson-step {
  padding-top: 3px;
  color: var(--color-accent-strong);
  font-size: var(--type-label);
  font-weight: 800;
  letter-spacing: 0.08em;
}

.lesson-card-ink .lesson-step,
.lesson-card-ink .lesson-duration {
  color: var(--color-accent-soft);
}

.lesson-card summary > span:nth-child(2) {
  font-size: clamp(1.25rem, 2.3vw, 1.65rem);
  font-weight: 760;
  letter-spacing: -0.04em;
  line-height: 1.15;
  overflow-wrap: anywhere;
}

.summary-arrow {
  font-size: 1.35rem;
  line-height: 1;
  transition: transform 180ms ease-out;
}

.lesson-card[open] .summary-arrow {
  transform: rotate(90deg);
}

.lesson-card p {
  max-width: 32ch;
  margin: var(--space-8) 0 var(--space-10);
  color: var(--color-ink-muted);
  font-weight: 500;
  line-height: 1.55;
}

.lesson-card-ink p {
  color: color-mix(in srgb, var(--color-ink-inverse) 78%, transparent);
}

.lesson-duration {
  display: block;
}

.section-architecture {
  background: var(--color-canvas);
}

.architecture-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-5);
  margin-top: var(--space-12);
}

.architecture-step {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.architecture-step summary {
  display: grid;
  min-height: 72px;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6);
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  font-weight: 760;
  letter-spacing: -0.035em;
  line-height: 1.2;
  cursor: pointer;
  list-style: none;
}

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

.architecture-index,
.architecture-label {
  color: var(--color-accent-strong);
  font-size: var(--type-label);
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.architecture-toggle {
  color: var(--color-accent-strong);
  font-size: 1.4rem;
  font-weight: 500;
  transition: transform 180ms ease-out;
}

.architecture-step[open] .architecture-toggle {
  transform: rotate(45deg);
}

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

.architecture-body p {
  max-width: 56ch;
  margin: 0 0 var(--space-5);
  color: var(--color-ink-muted);
  font-weight: 500;
  line-height: 1.55;
}

.architecture-note {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: var(--space-6);
  margin-top: var(--space-6);
  padding: clamp(var(--space-6), 4vw, var(--space-8));
  border-radius: var(--radius-lg);
  background: var(--color-accent-soft);
}

.architecture-note-mark {
  display: grid;
  width: 72px;
  height: 72px;
  place-items: center;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-ink-inverse);
  font-size: var(--type-label);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.architecture-note h3 {
  margin: 0 0 var(--space-2);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 780;
  letter-spacing: -0.04em;
}

.architecture-note p {
  max-width: 68ch;
  margin: 0;
  color: var(--color-ink-muted);
  font-weight: 520;
}

.section-personas {
  background: var(--color-canvas);
}

.persona-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-5);
  margin-top: var(--space-12);
}

.persona-card {
  display: flex;
  min-height: 330px;
  flex-direction: column;
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  transition: transform 180ms ease-out, box-shadow 180ms ease-out;
}

.persona-card:hover,
.persona-card:focus-within {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.persona-citizen {
  background: var(--color-surface-soft);
}

.persona-family {
  background: var(--color-surface-warm);
}

.persona-admin {
  background: var(--color-ink);
  color: var(--color-ink-inverse);
}

.persona-number {
  color: var(--color-accent-strong);
  font-size: var(--type-label);
  font-weight: 800;
  letter-spacing: 0.08em;
}

.persona-admin .persona-number,
.persona-admin .persona-role {
  color: var(--color-accent-soft);
}

.persona-card h3 {
  margin: var(--space-10) 0 var(--space-4);
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: 780;
  letter-spacing: -0.055em;
  line-height: 1.08;
  overflow-wrap: anywhere;
}

.persona-card > p {
  max-width: 29ch;
  margin: 0;
  color: var(--color-ink-muted);
  font-size: 1.05rem;
  font-weight: 520;
  line-height: 1.55;
}

.persona-admin > p {
  color: color-mix(in srgb, var(--color-ink-inverse) 78%, transparent);
}

.persona-path {
  display: grid;
  gap: var(--space-1);
  margin-top: auto;
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  font-size: var(--type-small);
  line-height: 1.45;
}

.persona-path strong {
  color: var(--color-accent-strong);
  font-size: var(--type-label);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.persona-admin .persona-path {
  border-color: color-mix(in srgb, var(--color-ink-inverse) 24%, transparent);
}

.persona-admin .persona-path strong {
  color: var(--color-accent-soft);
}

.section-channels {
  background: var(--color-surface-soft);
  border-block: 1px solid var(--color-border);
}

.channels-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
  align-items: start;
  gap: clamp(var(--space-8), 7vw, var(--space-16));
}

.channels-stack {
  display: grid;
  gap: var(--space-6);
}

.channel-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  padding: 0;
  margin: 0;
  list-style: none;
}

.channel-list li {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

.channel-mark {
  display: inline-grid;
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: 50%;
  background: var(--color-ink);
  color: var(--color-ink-inverse);
  font-size: var(--type-small);
  font-weight: 800;
}

.channel-line,
.channel-whatsapp,
.channel-viber {
  background: var(--color-accent);
}

.channel-sms {
  width: 48px;
  border-radius: var(--radius-sm);
  font-size: var(--type-label);
}

.channel-list li > span:last-child {
  display: grid;
  gap: var(--space-1);
  min-width: 0;
}

.channel-list strong {
  font-size: 1rem;
  font-weight: 750;
  overflow-wrap: anywhere;
}

.channel-list small {
  color: var(--color-ink-muted);
  font-size: var(--type-small);
  line-height: 1.35;
  overflow-wrap: anywhere;
}

.data-panel {
  padding: clamp(var(--space-6), 4vw, var(--space-8));
  border-radius: var(--radius-lg);
  background: var(--color-ink);
  color: var(--color-ink-inverse);
  box-shadow: var(--shadow-soft);
}

.data-panel-label {
  color: var(--color-accent-soft);
}

.data-panel h3 {
  max-width: 18ch;
  margin: var(--space-4) 0 var(--space-4);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 780;
  letter-spacing: -0.055em;
  line-height: 1.08;
  overflow-wrap: anywhere;
}

.data-panel p {
  max-width: 54ch;
  margin: 0;
  color: color-mix(in srgb, var(--color-ink-inverse) 78%, transparent);
  font-weight: 500;
}

.data-flow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-8);
  color: var(--color-accent-soft);
  font-size: var(--type-small);
  font-weight: 750;
}

.data-flow i {
  color: var(--color-ink-inverse);
  font-style: normal;
}

.cta-wrap {
  padding-block: clamp(var(--space-16), 8vw, var(--space-20));
  background: var(--color-canvas);
}

.cta-panel {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: var(--space-8);
  padding: clamp(var(--space-8), 6vw, var(--space-12));
  border-radius: var(--radius-lg);
  background: var(--color-accent);
  color: var(--color-ink-inverse);
  box-shadow: var(--shadow-soft);
}

.cta-kicker {
  color: var(--color-ink-inverse);
}

.cta-panel h2 {
  max-width: 15ch;
  margin: var(--space-4) 0 var(--space-4);
  font-size: var(--type-h2);
  font-weight: 780;
  letter-spacing: -0.06em;
  line-height: 1.08;
  overflow-wrap: anywhere;
}

.cta-panel p:not(.cta-kicker) {
  max-width: 48ch;
  margin: 0;
  color: color-mix(in srgb, var(--color-ink-inverse) 90%, transparent);
  font-weight: 520;
}

.cta-actions {
  display: grid;
  flex: 0 0 auto;
  justify-items: start;
  gap: var(--space-4);
}

.text-link-light {
  color: var(--color-ink-inverse);
}

.text-link-light:hover {
  color: var(--color-surface-soft);
}

.site-footer {
  padding-block: var(--space-12) var(--space-8);
  background: var(--color-ink);
  color: var(--color-ink-inverse);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-10);
}

.brand-light {
  color: var(--color-ink-inverse);
}

.footer-brand p {
  max-width: 30ch;
  margin: var(--space-5) 0 0;
  color: color-mix(in srgb, var(--color-ink-inverse) 68%, transparent);
  font-size: var(--type-small);
  font-weight: 500;
  line-height: 1.5;
}

.footer-nav {
  display: grid;
  align-content: start;
  gap: var(--space-3);
}

.footer-nav a {
  color: color-mix(in srgb, var(--color-ink-inverse) 76%, transparent);
}

.footer-meta {
  display: grid;
  align-content: start;
  gap: var(--space-2);
  color: color-mix(in srgb, var(--color-ink-inverse) 58%, transparent);
  font-size: var(--type-small);
  line-height: 1.5;
}

.noscript-note {
  padding: var(--space-4) var(--space-6);
  background: var(--color-focus);
  color: var(--color-ink);
  font-size: var(--type-small);
  font-weight: 700;
  text-align: center;
}

.hero-copy,
.hero-visual {
  animation: hero-enter 520ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.hero-visual {
  animation-delay: 80ms;
}

@keyframes hero-enter {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1023px) {
  .header-inner {
    gap: var(--space-5);
  }

  .main-nav {
    gap: var(--space-4);
  }

  .header-actions {
    gap: var(--space-2);
  }

  .header-actions .button-small {
    display: none;
  }

  .hero {
    gap: var(--space-8);
  }
}

@media (min-width: 768px) and (max-width: 820px) {
  .header-inner {
    grid-template-columns: auto auto;
    justify-content: space-between;
    min-height: 68px;
  }

  .menu-toggle {
    display: inline-flex;
    justify-self: end;
  }

  .main-nav {
    position: absolute;
    top: 68px;
    right: var(--space-6);
    left: var(--space-6);
    display: grid;
    gap: 0;
    padding: var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    box-shadow: var(--shadow-card);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity 220ms ease-in-out, transform 220ms ease-in-out;
  }

  .main-nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .header-actions {
    grid-column: 1 / -1;
    justify-content: flex-end;
    margin-top: calc(var(--space-3) * -1);
    padding-bottom: var(--space-3);
  }

  .header-actions .button-small {
    display: none;
  }
}

@media (max-width: 767px) {
  html {
    scroll-padding-top: 76px;
  }

  .shell {
    width: min(100% - (var(--space-5) * 2), 620px);
  }

  .header-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    justify-content: space-between;
    min-height: 68px;
  }

  .brand {
    min-width: 0;
    white-space: normal;
  }

  .menu-toggle {
    display: inline-flex;
    justify-self: end;
  }

  .main-nav {
    position: absolute;
    top: 68px;
    right: var(--space-5);
    left: var(--space-5);
    display: grid;
    gap: 0;
    padding: var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    box-shadow: var(--shadow-card);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity 220ms ease-in-out, transform 220ms ease-in-out;
  }

  .main-nav a {
    padding: var(--space-3) var(--space-4);
  }

  .main-nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .menu-toggle[aria-expanded="true"] .menu-icon i:first-child {
    transform: translateY(3px) rotate(45deg);
  }

  .menu-toggle[aria-expanded="true"] .menu-icon i:last-child {
    transform: translateY(-3px) rotate(-45deg);
  }

  .header-actions {
    grid-column: 1 / -1;
    width: 100%;
    min-width: 0;
    flex-wrap: wrap;
    justify-content: flex-end;
    margin-top: calc(var(--space-3) * -1);
    padding-bottom: var(--space-3);
  }

  .language-control {
    min-width: 0;
    max-width: 100%;
  }

  .language-control select {
    min-width: 0;
    max-width: 100%;
  }

  .hero {
    display: flex;
    min-height: auto;
    flex-direction: column;
    align-items: stretch;
    padding-block: var(--space-12) var(--space-16);
  }

  .hero h1 {
    max-width: 12ch;
    font-size: clamp(2.35rem, 10vw, 3.5rem);
  }

  .hero-visual figcaption {
    margin-left: 0;
    text-align: left;
  }

  .section {
    padding-block: var(--space-16);
  }

  .section-intro h2 {
    max-width: 18ch;
  }

  .empathy-grid,
  .channels-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-10);
  }

  .thread-card,
  .empathy-note,
  .channels-stack {
    min-width: 0;
  }

  .thread-topline,
  .persona-top {
    min-width: 0;
    flex-wrap: wrap;
  }

  .thread-label,
  .thread-status,
  .persona-role {
    min-width: 0;
  }

  .empathy-note {
    padding-left: var(--space-6);
  }

  .lesson-grid,
  .persona-grid,
  .architecture-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-4);
    margin-top: var(--space-10);
  }

  .lesson-card,
  .persona-card,
  .architecture-step {
    min-width: 0;
    min-height: 0;
  }

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

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

  .cta-panel {
    display: grid;
    align-items: start;
  }

  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-8);
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .hero-copy,
  .hero-visual {
    animation: none;
  }
}