/* ================================================================
   1. Design tokens
   色や余白など、サイト全体で共有する値をここにまとめています。
   ================================================================ */

:root {
  --color-bg: #fcfaf7;
  --color-surface: #ffffff;
  --color-surface-soft: #f3f0ea;
  --color-text: #171716;
  --color-muted: #615d57;
  --color-border: #dcd6cd;
  --color-accent: #d3482f;
  --color-accent-strong: #a93120;
  --color-accent-soft: #fae9e3;
  --color-dark: #1d1d1b;
  --color-dark-muted: #aaa69f;

  --font-sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Yu Gothic", YuGothic, Meiryo, sans-serif;

  --container: 70rem;
  --container-narrow: 48rem;
  --header-height: 5rem;

  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --space-8: 7rem;

  --radius-small: 0.5rem;
  --radius-medium: 1rem;
  --radius-large: 1.75rem;
  --shadow-soft: 0 1.5rem 4rem rgba(40, 31, 24, 0.1);
  --transition: 180ms ease;
}

/* ================================================================
   2. Base styles
   ブラウザごとの差を整え、読みやすい初期状態を作ります。
   ================================================================ */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1.5rem);
}

body {
  margin: 0;
  overflow-x: hidden;
  color: var(--color-text);
  background: var(--color-bg);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.8;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

button,
input,
textarea,
select {
  font: inherit;
}

button,
a {
  touch-action: manipulation;
}

a {
  color: inherit;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

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

h1,
h2,
h3 {
  margin-bottom: 0;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

p,
li,
summary {
  overflow-wrap: anywhere;
}

ul,
ol {
  margin-bottom: 0;
}

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

::selection {
  color: #ffffff;
  background: var(--color-accent-strong);
}

.container {
  width: min(calc(100% - 3rem), var(--container));
  margin-inline: auto;
}

.section {
  padding-block: clamp(5rem, 9vw, var(--space-8));
}

.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;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.7rem 1rem;
  color: #ffffff;
  background: var(--color-accent-strong);
  border-radius: var(--radius-small);
  transform: translateY(-160%);
  transition: transform var(--transition);
}

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

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: var(--space-3);
  color: var(--color-accent-strong);
  font-size: 0.75rem;
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 1.75rem;
  height: 2px;
  background: currentcolor;
  content: "";
}

.section-heading {
  max-width: 43rem;
  margin-bottom: clamp(3rem, 6vw, 5rem);
}

.section-heading h2,
.use-case h2,
.pilot h2,
.contact h2 {
  font-size: clamp(2.1rem, 5vw, 4.5rem);
}

.section-heading > p:last-child {
  max-width: 40rem;
  margin-top: var(--space-4);
  margin-bottom: 0;
  color: var(--color-muted);
}

.section-heading--split {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(18rem, 0.75fr);
  gap: var(--space-7);
  max-width: none;
  align-items: end;
}

.section-heading--split > p {
  margin-bottom: 0;
  color: var(--color-muted);
}

.section-heading--center {
  margin-inline: auto;
  text-align: center;
}

.section-heading--center .eyebrow {
  justify-content: center;
}

.transformation h2,
.demo h2,
.pilot h2,
.contact h2 {
  word-break: keep-all;
}

/* ================================================================
   3. Shared buttons and brand elements
   ================================================================ */

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  min-height: 2.75rem;
  font-size: 1.1rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  text-decoration: none;
}

.wordmark__mark {
  position: relative;
  display: inline-block;
  width: 1rem;
  height: 1rem;
  flex: 0 0 auto;
  background: var(--color-accent);
  border-radius: 0.2rem;
  transform: rotate(45deg);
}

.wordmark__mark::after {
  position: absolute;
  inset: 0.25rem;
  background: var(--color-bg);
  border-radius: 0.08rem;
  content: "";
}

.button {
  display: inline-flex;
  min-height: 3.25rem;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.4rem;
  color: #ffffff;
  background: var(--color-accent-strong);
  border: 1px solid var(--color-accent-strong);
  border-radius: 999px;
  box-shadow: 0 0.7rem 1.5rem rgba(169, 49, 32, 0.18);
  font-size: 0.93rem;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  transition:
    color var(--transition),
    background-color var(--transition),
    border-color var(--transition),
    transform var(--transition),
    box-shadow var(--transition);
}

.button:hover {
  background: #872518;
  border-color: #872518;
  box-shadow: 0 0.9rem 2rem rgba(135, 37, 24, 0.2);
  transform: translateY(-2px);
}

.button--small {
  min-height: 2.75rem;
  padding-inline: 1.15rem;
  font-size: 0.82rem;
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
}

.text-link {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.92rem;
  font-weight: 700;
  text-decoration: none;
}

.text-link span {
  color: var(--color-accent-strong);
  transition: transform var(--transition);
}

.text-link:hover span {
  transform: translateY(3px);
}

/* ================================================================
   4. Header and navigation
   ================================================================ */

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  height: var(--header-height);
  background: rgba(252, 250, 247, 0.95);
  border-bottom: 1px solid rgba(220, 214, 205, 0.8);
  backdrop-filter: blur(12px);
}

.site-header__inner {
  display: flex;
  height: 100%;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.site-nav__panel,
.site-nav__list {
  display: flex;
  align-items: center;
}

.site-nav__panel {
  gap: var(--space-5);
}

.site-nav__list {
  gap: 1.75rem;
  padding: 0;
  list-style: none;
}

.site-nav__list a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  color: var(--color-muted);
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
  transition: color var(--transition);
}

.site-nav__list a:hover {
  color: var(--color-text);
}

.nav-toggle {
  display: none;
  min-width: 2.75rem;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.5rem 0.75rem;
  color: var(--color-text);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  cursor: pointer;
}

.nav-toggle__label {
  font-size: 0.75rem;
  font-weight: 700;
}

.nav-toggle__icon {
  position: relative;
  display: block;
  width: 1rem;
  height: 0.7rem;
}

.nav-toggle__icon span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentcolor;
  transition:
    top var(--transition),
    transform var(--transition);
}

.nav-toggle__icon span:first-child {
  top: 0.1rem;
}

.nav-toggle__icon span:last-child {
  top: 0.5rem;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:first-child {
  top: 0.3rem;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:last-child {
  top: 0.3rem;
  transform: rotate(-45deg);
}

/* ================================================================
   5. Hero
   ================================================================ */

.hero {
  position: relative;
  display: grid;
  min-height: calc(100svh - var(--header-height));
  align-items: center;
  padding-block: clamp(4.5rem, 8vw, 7rem);
  overflow: hidden;
}

.hero::before {
  position: absolute;
  z-index: -1;
  top: 8%;
  right: -12rem;
  width: 31rem;
  height: 31rem;
  background: var(--color-accent-soft);
  border-radius: 50%;
  content: "";
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(27rem, 0.95fr);
  gap: clamp(3rem, 7vw, 6rem);
  align-items: center;
}

.hero__copy {
  max-width: 39rem;
}

.hero h1 {
  margin-bottom: var(--space-5);
  font-size: clamp(3rem, 6vw, 5.1rem);
  line-height: 1.08;
  letter-spacing: -0.065em;
}

.hero-title__line,
.hero-title__accent {
  display: block;
  width: max-content;
  max-width: 100%;
  white-space: nowrap;
}

.hero-title__accent {
  color: var(--color-accent-strong);
}

.hero__lead {
  max-width: 38rem;
  margin-bottom: var(--space-4);
  color: #383531;
  font-size: clamp(1.05rem, 1.5vw, 1.25rem);
  font-weight: 600;
  line-height: 1.85;
}

.hero__description {
  max-width: 36rem;
  margin-bottom: var(--space-3);
  color: var(--color-muted);
}

.hero__notice {
  max-width: 36rem;
  margin-bottom: var(--space-5);
  padding-left: var(--space-3);
  color: #45413c;
  border-left: 2px solid var(--color-accent);
  font-size: 0.9rem;
}

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

.hero-visual::after {
  position: absolute;
  z-index: -1;
  right: -1.5rem;
  bottom: -1.5rem;
  width: 70%;
  height: 70%;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 0.5rem,
    rgba(211, 72, 47, 0.14) 0.5rem,
    rgba(211, 72, 47, 0.14) 0.6rem
  );
  border-radius: var(--radius-large);
  content: "";
}

.hero-visual__content {
  display: grid;
  grid-template-columns: minmax(11rem, 1.35fr) auto minmax(7rem, 0.8fr);
  gap: 1rem;
  min-height: 27rem;
  align-items: center;
  padding: clamp(1.25rem, 3vw, 2.5rem);
  color: #ffffff;
  background: var(--color-dark);
  border-radius: var(--radius-large);
  box-shadow: var(--shadow-soft);
}

.source-preview {
  padding: 0.75rem;
  background: #2b2b28;
  border: 1px solid #44433f;
  border-radius: 0.85rem;
}

.preview-topline {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.6rem;
  color: var(--color-dark-muted);
  font-size: 0.55rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.source-preview__screen {
  position: relative;
  display: grid;
  aspect-ratio: 16 / 9;
  place-items: center;
  background:
    linear-gradient(135deg, #3b3934 0 50%, #302f2b 50% 100%);
  border-radius: 0.5rem;
}

.play-symbol {
  display: block;
  width: 0;
  height: 0;
  border-top: 0.5rem solid transparent;
  border-bottom: 0.5rem solid transparent;
  border-left: 0.75rem solid var(--color-accent);
  filter: drop-shadow(0 0.3rem 0.5rem rgba(0, 0, 0, 0.25));
}

.timeline {
  position: relative;
  height: 2.35rem;
  margin-top: 0.7rem;
}

.timeline__base,
.timeline__highlight {
  position: absolute;
  top: 0.5rem;
  height: 0.35rem;
  border-radius: 999px;
}

.timeline__base {
  right: 0;
  left: 0;
  background: #4b4a45;
}

.timeline__highlight {
  background: var(--color-accent);
}

.timeline__highlight--one {
  left: 12%;
  width: 17%;
}

.timeline__highlight--two {
  left: 46%;
  width: 12%;
}

.timeline__highlight--three {
  right: 9%;
  width: 20%;
}

.timeline::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 0.75rem;
  background: repeating-linear-gradient(90deg, #393834 0 0.25rem, transparent 0.25rem 0.4rem);
  content: "";
}

.transform-label {
  display: flex;
  width: 5.5rem;
  flex-direction: column;
  align-items: center;
  color: var(--color-dark-muted);
  font-size: 0.5rem;
  line-height: 1.4;
  letter-spacing: 0.08em;
  text-align: center;
}

.transform-label__line {
  width: 100%;
  height: 1px;
  margin-bottom: 0.65rem;
  background: #55534e;
}

.transform-label strong {
  margin-top: 0.25rem;
  color: #ffffff;
  font-size: 0.62rem;
  letter-spacing: 0;
}

.transform-label__arrow {
  margin-top: 0.75rem;
  color: var(--color-accent);
  font-size: 1rem;
}

.short-preview-group {
  position: relative;
  min-height: 16rem;
}

.short-preview {
  position: absolute;
  width: clamp(4.25rem, 7vw, 5.25rem);
  aspect-ratio: 9 / 16;
  padding: 0.55rem;
  background: #34332f;
  border: 1px solid #55534e;
  border-radius: 0.65rem;
  box-shadow: 0 0.8rem 1.5rem rgba(0, 0, 0, 0.24);
}

.short-preview::before {
  position: absolute;
  inset: 28% 0.55rem auto;
  height: 28%;
  background: #43413c;
  border-radius: 0.35rem;
  content: "";
}

.short-preview__number {
  position: relative;
  z-index: 1;
  display: block;
  color: var(--color-dark-muted);
  font-size: 0.42rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.short-preview__caption {
  position: absolute;
  right: 0.5rem;
  bottom: 1rem;
  left: 0.5rem;
  padding: 0.2rem;
  color: #ffffff;
  background: var(--color-accent-strong);
  border-radius: 0.2rem;
  font-size: 0.35rem;
  font-weight: 700;
  text-align: center;
}

.short-preview--one {
  z-index: 3;
  top: 1.5rem;
  left: 0;
  transform: rotate(-5deg);
}

.short-preview--two {
  z-index: 2;
  top: 0;
  left: 2.75rem;
}

.short-preview--three {
  z-index: 1;
  top: 2.5rem;
  left: 5.5rem;
  transform: rotate(5deg);
}

/* ================================================================
   6. Problem
   ================================================================ */

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

.task-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: 0;
  border-top: 1px solid var(--color-text);
  list-style: none;
}

.task-list li {
  display: flex;
  min-height: 5.5rem;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-3) var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
  font-weight: 700;
}

.task-list li:not(:nth-child(3n + 1)) {
  padding-left: var(--space-3);
  border-left: 1px solid var(--color-border);
}

.task-list span {
  color: var(--color-accent-strong);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.problem__conclusion {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--space-6);
  margin-top: var(--space-6);
  align-items: end;
}

.problem__conclusion p {
  margin-bottom: 0;
}

.problem__conclusion p:first-child {
  font-size: clamp(1.5rem, 3vw, 2.3rem);
  font-weight: 700;
  line-height: 1.5;
}

.problem__conclusion strong {
  color: var(--color-accent-strong);
}

.problem__conclusion p:last-child {
  color: var(--color-muted);
}

/* ================================================================
   7. How it works
   ================================================================ */

.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  padding: 0;
  list-style: none;
}

.step {
  position: relative;
  padding: 0 var(--space-4);
}

.step:first-child {
  padding-left: 0;
}

.step:last-child {
  padding-right: 0;
}

.step + .step {
  border-left: 1px solid var(--color-border);
}

.step__number {
  margin-bottom: var(--space-4);
  color: var(--color-accent-strong);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.step__icon {
  position: relative;
  display: grid;
  width: 4.25rem;
  height: 4.25rem;
  margin-bottom: var(--space-4);
  place-items: center;
  background: var(--color-surface-soft);
  border-radius: 50%;
}

.step__icon span {
  position: relative;
  display: block;
  width: 1.75rem;
  height: 1.35rem;
  border: 2px solid var(--color-text);
  border-radius: 0.2rem;
}

.step__icon--input span::after {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-top: 0.28rem solid transparent;
  border-bottom: 0.28rem solid transparent;
  border-left: 0.42rem solid var(--color-accent);
  content: "";
  transform: translate(-40%, -50%);
}

.step__icon--select span::before,
.step__icon--select span::after {
  position: absolute;
  height: 0.18rem;
  background: var(--color-accent);
  content: "";
}

.step__icon--select span::before {
  top: 0.35rem;
  right: 0.25rem;
  left: 0.25rem;
}

.step__icon--select span::after {
  right: 0.55rem;
  bottom: 0.3rem;
  left: 0.25rem;
}

.step__icon--caption span::after {
  position: absolute;
  right: 0.2rem;
  bottom: 0.2rem;
  left: 0.2rem;
  height: 0.35rem;
  background: var(--color-accent);
  content: "";
}

.step__icon--output span {
  width: 1rem;
  height: 1.75rem;
}

.step__icon--output span::before,
.step__icon--output span::after {
  position: absolute;
  top: -2px;
  width: 1rem;
  height: 1.75rem;
  border: 2px solid var(--color-text);
  border-radius: 0.2rem;
  content: "";
}

.step__icon--output span::before {
  left: -0.6rem;
}

.step__icon--output span::after {
  right: -0.6rem;
}

.step h3 {
  margin-bottom: var(--space-2);
  font-size: 1.15rem;
}

.step > p:last-child {
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: 0.9rem;
}

/* ================================================================
   8. Before / After diagram
   ================================================================ */

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

.conversion-diagram {
  display: grid;
  grid-template-columns: minmax(13rem, 1.2fr) auto minmax(9rem, 0.65fr) auto minmax(17rem, 1.3fr);
  gap: clamp(0.75rem, 2.5vw, 2rem);
  align-items: center;
  margin-bottom: var(--space-4);
  padding: clamp(1.5rem, 4vw, 3rem);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-large);
  box-shadow: var(--shadow-soft);
}

.diagram-label {
  margin-bottom: var(--space-2);
  color: var(--color-accent-strong);
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.landscape-frame {
  position: relative;
  display: grid;
  aspect-ratio: 16 / 9;
  place-items: center;
  overflow: hidden;
  background: var(--color-dark);
  border-radius: var(--radius-medium);
}

.landscape-frame::before {
  position: absolute;
  inset: 0;
  background: linear-gradient(140deg, #373631 0 50%, #292825 50% 100%);
  content: "";
}

.landscape-frame__time {
  position: absolute;
  z-index: 1;
  top: 0.75rem;
  right: 0.75rem;
  padding: 0.2rem 0.4rem;
  color: #ffffff;
  background: var(--color-accent-strong);
  border-radius: 0.25rem;
  font-size: 0.5rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.play-symbol--light {
  position: relative;
  z-index: 1;
  border-left-color: #ffffff;
}

.landscape-frame__bar {
  position: absolute;
  z-index: 1;
  right: 0.75rem;
  bottom: 0.75rem;
  left: 0.75rem;
  height: 0.2rem;
  background: #5b5852;
  border-radius: 999px;
}

.landscape-frame__bar::after {
  display: block;
  width: 42%;
  height: 100%;
  background: var(--color-accent);
  border-radius: inherit;
  content: "";
}

.conversion-source h3,
.conversion-output h3 {
  margin-top: var(--space-3);
  font-size: 1rem;
}

.conversion-source > p:last-child,
.conversion-output > p:last-child {
  margin: 0.25rem 0 0;
  color: var(--color-muted);
  font-size: 0.72rem;
}

.conversion-arrow {
  color: var(--color-accent);
  font-size: 1.5rem;
  text-align: center;
}

.conversion-engine {
  display: flex;
  min-height: 10rem;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-3);
  background: var(--color-accent-soft);
  border: 1px solid #efc9be;
  border-radius: var(--radius-medium);
  text-align: center;
}

.conversion-engine .wordmark__mark {
  margin-bottom: var(--space-2);
}

.conversion-engine .wordmark__mark::after {
  background: var(--color-accent-soft);
}

.conversion-engine strong {
  font-size: 0.95rem;
}

.conversion-engine > span:last-child {
  margin-top: 0.3rem;
  color: var(--color-muted);
  font-size: 0.65rem;
}

.vertical-frames {
  display: flex;
  align-items: end;
  justify-content: center;
  gap: 0.55rem;
}

.vertical-frame {
  position: relative;
  width: min(5rem, 7vw);
  aspect-ratio: 9 / 16;
  overflow: hidden;
  background: var(--color-dark);
  border: 2px solid #34332f;
  border-radius: 0.65rem;
}

.vertical-frame::before {
  position: absolute;
  inset: 20% 0.45rem 38%;
  background: #383732;
  border-radius: 0.3rem;
  content: "";
}

.vertical-frame span {
  position: absolute;
  top: 0.45rem;
  left: 0.45rem;
  color: var(--color-dark-muted);
  font-size: 0.4rem;
  font-style: normal;
  font-weight: 800;
}

.vertical-frame i {
  position: absolute;
  right: 0.45rem;
  bottom: 1rem;
  left: 0.45rem;
  height: 0.35rem;
  background: var(--color-accent);
  border-radius: 0.15rem;
}

.vertical-frame--one {
  transform: translateY(0.65rem);
}

.vertical-frame--three {
  transform: translateY(0.35rem);
}

.section-note {
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: 0.78rem;
  text-align: center;
}

/* ================================================================
   9. Use cases
   ================================================================ */

.use-case {
  background: var(--color-surface);
}

.use-case--alternate {
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

.use-case__grid {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(22rem, 1.08fr);
  gap: clamp(3rem, 8vw, 7rem);
  align-items: center;
}

.use-case--alternate .use-case__content {
  order: 2;
}

.use-case--alternate .journey {
  order: 1;
}

.use-case__lead {
  max-width: 31rem;
  margin: var(--space-4) 0 var(--space-5);
  color: var(--color-muted);
  font-size: 1.08rem;
  font-weight: 600;
}

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

.tag-list li {
  padding: 0.55rem 0.85rem;
  background: var(--color-surface-soft);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: #48443e;
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.4;
}

.journey {
  padding: clamp(1.5rem, 4vw, 3rem);
  background: var(--color-surface-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-large);
}

.use-case--alternate .journey {
  background: var(--color-surface);
}

.journey__title {
  margin-bottom: var(--space-4);
  color: var(--color-accent-strong);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.journey ol {
  padding: 0;
  list-style: none;
}

.journey li {
  position: relative;
  display: flex;
  min-height: 3.5rem;
  align-items: center;
  gap: var(--space-3);
  padding-bottom: var(--space-3);
}

.journey li:not(:last-child)::after {
  position: absolute;
  bottom: 0.15rem;
  left: 0.9rem;
  width: 1px;
  height: 1rem;
  background: var(--color-border);
  content: "";
}

.journey li span {
  display: grid;
  width: 1.8rem;
  height: 1.8rem;
  flex: 0 0 auto;
  place-items: center;
  color: #ffffff;
  background: var(--color-accent-strong);
  border-radius: 50%;
  font-size: 0.55rem;
  font-weight: 800;
}

.journey li strong {
  font-size: 0.95rem;
}

.journey__note {
  margin: var(--space-3) 0 0;
  padding-top: var(--space-3);
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
  font-size: 0.72rem;
}

.journey__routes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}

.journey__routes ol {
  padding: var(--space-3);
  background: var(--color-surface-soft);
  border-radius: var(--radius-medium);
}

/* ================================================================
   10. Demo
   ================================================================ */

.demo {
  color: #ffffff;
  background: var(--color-dark);
}

.demo .eyebrow {
  color: #f4846c;
}

.demo-stage {
  padding: clamp(1.5rem, 4vw, 3rem);
  border: 1px solid #45443f;
  border-radius: var(--radius-large);
}

.demo-stage__message {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  align-items: end;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid #45443f;
}

.demo-stage__message > p:last-child {
  margin-bottom: 0;
  color: var(--color-dark-muted);
}

.demo-stage__coming {
  margin-bottom: 0;
  font-size: clamp(2.8rem, 7vw, 6rem);
  font-weight: 800;
  line-height: 0.92;
  letter-spacing: -0.06em;
}

.demo-stage__coming span {
  color: #f4846c;
}

.demo-slots {
  display: grid;
  grid-template-columns: 2fr repeat(3, minmax(5rem, 0.7fr));
  gap: var(--space-3);
  align-items: end;
}

.demo-slot {
  min-width: 0;
}

.demo-slot p {
  margin-bottom: var(--space-2);
  color: var(--color-dark-muted);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.demo-slot__frame {
  display: grid;
  aspect-ratio: 9 / 16;
  place-items: center;
  color: #77746d;
  background: #292926;
  border: 1px dashed #5a5852;
  border-radius: var(--radius-medium);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.demo-slot--source .demo-slot__frame {
  aspect-ratio: 16 / 9;
}

/* ================================================================
   11. Pilot program
   ================================================================ */

.pilot {
  background: var(--color-accent-soft);
}

.pilot__intro {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--space-7);
  align-items: end;
}

.pilot__intro .eyebrow {
  grid-column: 1 / -1;
  margin-bottom: calc(var(--space-6) * -1);
}

.pilot__body p {
  color: #514943;
}

.pilot__body p:last-child {
  margin-bottom: 0;
}

.pilot__details {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-7);
}

.pilot__audience,
.pilot__flow {
  padding: clamp(1.5rem, 4vw, 2.5rem);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid #edc9bf;
  border-radius: var(--radius-large);
}

.pilot__details h3 {
  margin-bottom: var(--space-4);
  font-size: 1.15rem;
}

.check-list {
  display: grid;
  gap: var(--space-2);
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 1.6rem;
  color: #4e4843;
  font-size: 0.9rem;
}

.check-list li::before {
  position: absolute;
  top: 0.65rem;
  left: 0;
  width: 0.75rem;
  height: 0.4rem;
  border-bottom: 2px solid var(--color-accent-strong);
  border-left: 2px solid var(--color-accent-strong);
  content: "";
  transform: rotate(-45deg);
}

.pilot__flow ol {
  display: grid;
  gap: var(--space-2);
  padding: 0;
  list-style: none;
}

.pilot__flow li {
  display: flex;
  min-height: 3rem;
  align-items: center;
  gap: var(--space-3);
  padding: 0.6rem 0;
  border-bottom: 1px solid #ead0c8;
  font-size: 0.9rem;
  font-weight: 700;
}

.pilot__flow li span {
  color: var(--color-accent-strong);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.pilot__note {
  margin: var(--space-4) 0 0;
  color: #66564f;
  font-size: 0.78rem;
  text-align: center;
}

/* ================================================================
   12. FAQ
   ================================================================ */

.faq {
  background: var(--color-surface);
}

.faq__grid {
  display: grid;
  grid-template-columns: minmax(15rem, 0.7fr) minmax(0, 1.3fr);
  gap: clamp(3rem, 8vw, 7rem);
}

.faq__grid .section-heading {
  margin-bottom: 0;
}

.faq-list {
  border-top: 1px solid var(--color-text);
}

.faq-list details {
  border-bottom: 1px solid var(--color-border);
}

.faq-list summary {
  position: relative;
  display: flex;
  min-height: 5rem;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 1rem 3rem 1rem 0;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 700;
  list-style: none;
}

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

.faq-list summary span,
.faq-list summary span::after {
  position: absolute;
  width: 1rem;
  height: 2px;
  background: var(--color-accent-strong);
}

.faq-list summary span {
  top: 50%;
  right: 0.25rem;
}

.faq-list summary span::after {
  content: "";
  transform: rotate(90deg);
  transition: transform var(--transition);
}

.faq-list details[open] summary span::after {
  transform: rotate(0deg);
}

.faq-list details p {
  max-width: 43rem;
  margin: -0.25rem 0 0;
  padding: 0 3rem var(--space-4) 0;
  color: var(--color-muted);
}

/* ================================================================
   13. Contact and footer
   ================================================================ */

.contact {
  color: #ffffff;
  background: var(--color-dark);
}

.contact__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(20rem, 0.72fr);
  gap: clamp(3rem, 8vw, 7rem);
  align-items: center;
}

.contact .eyebrow {
  color: #f4846c;
}

.contact__copy > p:last-child {
  max-width: 39rem;
  margin-bottom: 0;
  color: var(--color-dark-muted);
}

.contact__questions {
  margin-block: var(--space-5);
  padding-left: var(--space-4);
  border-left: 2px solid var(--color-accent);
}

.contact__questions p {
  margin-bottom: 0.35rem;
  color: #d8d5cf;
  font-weight: 600;
}

.contact-form-card {
  padding: clamp(1.5rem, 4vw, 2.5rem);
  color: var(--color-text);
  background: var(--color-bg);
  border-radius: var(--radius-large);
}

.contact-form-card__title {
  margin-bottom: var(--space-4);
  font-size: clamp(1.35rem, 2.5vw, 1.65rem);
}

.contact-form-card__body {
  margin-bottom: var(--space-5);
}

.contact-form-card__body p {
  margin-bottom: var(--space-3);
  color: var(--color-muted);
}

.contact-form-card__body p:last-child {
  margin-bottom: 0;
}

.contact-form-card__button {
  width: 100%;
}

.contact-form-card__note {
  margin: var(--space-2) 0 0;
  color: var(--color-muted);
  font-size: 0.78rem;
  text-align: center;
  text-wrap: balance;
}

.site-footer {
  padding-block: var(--space-5);
  color: #ffffff;
  background: #11110f;
  border-top: 1px solid #33322f;
}

.site-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.wordmark--footer .wordmark__mark::after {
  background: #11110f;
}

.site-footer p {
  margin-bottom: 0;
  color: var(--color-dark-muted);
  font-size: 0.78rem;
}

/* ================================================================
   14. Tablet
   ================================================================ */

@media (max-width: 59.99rem) {
  :root {
    --header-height: 4.5rem;
  }

  .hero__grid,
  .section-heading--split,
  .use-case__grid,
  .pilot__intro,
  .faq__grid,
  .contact__inner {
    grid-template-columns: 1fr;
  }

  .section-heading--split {
    gap: var(--space-4);
    align-items: start;
  }

  .js .nav-toggle {
    display: inline-flex;
  }

  .js .site-nav__panel {
    position: absolute;
    top: calc(100% + 0.6rem);
    right: 1.5rem;
    display: none;
    width: min(22rem, calc(100vw - 3rem));
    padding: var(--space-3);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-medium);
    box-shadow: var(--shadow-soft);
  }

  .js .site-nav__panel[data-open="true"] {
    display: block;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-bottom: var(--space-2);
  }

  .site-nav__list a {
    min-height: 3rem;
    padding-inline: var(--space-2);
    border-bottom: 1px solid var(--color-border);
  }

  .site-nav__panel .button {
    width: 100%;
  }

  .no-js .site-header {
    height: auto;
  }

  .no-js .site-header__inner {
    flex-wrap: wrap;
    padding-block: 0.75rem;
  }

  .no-js .site-nav {
    width: 100%;
  }

  .no-js .site-nav__panel {
    display: block;
  }

  .hero {
    min-height: auto;
  }

  .hero__copy {
    max-width: 44rem;
  }

  .hero-visual {
    width: min(100%, 38rem);
    margin-inline: auto;
  }

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

  .task-list li:nth-child(3n + 1) {
    padding-left: var(--space-3);
  }

  .task-list li:not(:nth-child(3n + 1)) {
    border-left: 0;
  }

  .task-list li:nth-child(even) {
    padding-left: var(--space-3);
    border-left: 1px solid var(--color-border);
  }

  .step {
    padding: var(--space-5);
    border-bottom: 1px solid var(--color-border);
  }

  .step:first-child {
    padding-left: var(--space-5);
  }

  .step:last-child {
    padding-right: var(--space-5);
  }

  .step:nth-child(odd) {
    padding-left: 0;
  }

  .step:nth-child(even) {
    padding-right: 0;
    border-left: 1px solid var(--color-border);
  }

  .conversion-diagram {
    grid-template-columns: minmax(12rem, 1fr) auto minmax(8rem, 0.55fr) auto minmax(14rem, 1fr);
    padding: var(--space-4);
  }

  .vertical-frame {
    width: min(4.2rem, 7vw);
  }

  .use-case__grid {
    gap: var(--space-6);
  }

  .use-case--alternate .use-case__content,
  .use-case--alternate .journey {
    order: initial;
  }

  .pilot__intro .eyebrow {
    grid-column: auto;
    margin-bottom: calc(var(--space-6) * -1);
  }

  .faq__grid,
  .contact__inner {
    gap: var(--space-6);
  }
}

/* ================================================================
   15. Mobile
   ================================================================ */

@media (max-width: 47.99rem) {
  .container {
    width: min(calc(100% - 2rem), var(--container));
  }

  .section {
    padding-block: clamp(4.5rem, 17vw, 6rem);
  }

  .section-heading {
    margin-bottom: var(--space-6);
  }

  .section-heading h2,
  .use-case h2,
  .pilot h2,
  .contact h2 {
    font-size: clamp(2rem, 10vw, 3.2rem);
  }

  .site-header__inner {
    width: calc(100% - 2rem);
  }

  .js .site-nav__panel {
    right: 1rem;
    width: calc(100vw - 2rem);
  }

  .hero {
    padding-block: 3.5rem 5rem;
  }

  .hero__grid {
    gap: var(--space-6);
  }

  .hero h1 {
    font-size: clamp(2.8rem, 14vw, 4.6rem);
  }

  .hero__lead br {
    display: none;
  }

  .button-group {
    align-items: stretch;
  }

  .button-group .button {
    width: 100%;
  }

  .button-group .text-link {
    justify-content: center;
  }

  .hero-visual::after {
    right: -0.75rem;
    bottom: -0.75rem;
  }

  .hero-visual__content {
    grid-template-columns: 1fr;
    gap: var(--space-3);
    min-height: auto;
  }

  .transform-label {
    width: 100%;
  }

  .transform-label__line {
    width: 1px;
    height: 1.5rem;
  }

  .transform-label__arrow {
    transform: rotate(90deg);
  }

  .short-preview-group {
    width: 13rem;
    min-height: 13rem;
    margin-inline: auto;
  }

  .short-preview {
    width: 4.6rem;
  }

  .short-preview--one {
    left: 0;
  }

  .short-preview--two {
    left: 4rem;
  }

  .short-preview--three {
    left: 8rem;
  }

  .task-list,
  .steps,
  .problem__conclusion,
  .pilot__details,
  .demo-stage__message {
    grid-template-columns: 1fr;
  }

  .task-list li,
  .task-list li:nth-child(3n + 1),
  .task-list li:nth-child(even) {
    min-height: 4.25rem;
    padding: 0.75rem 0;
    border-left: 0;
  }

  .problem__conclusion {
    gap: var(--space-3);
  }

  .step,
  .step:first-child,
  .step:last-child,
  .step:nth-child(odd),
  .step:nth-child(even) {
    display: grid;
    grid-template-columns: auto 1fr;
    column-gap: var(--space-3);
    padding: var(--space-4) 0;
    border-right: 0;
    border-bottom: 1px solid var(--color-border);
    border-left: 0;
  }

  .step__number {
    grid-column: 1 / -1;
    margin-bottom: var(--space-2);
  }

  .step__icon {
    grid-row: 2 / 4;
    margin-bottom: 0;
  }

  .step h3 {
    align-self: end;
  }

  .step > p:last-child {
    align-self: start;
  }

  .conversion-diagram {
    grid-template-columns: 1fr;
    gap: var(--space-3);
    padding: var(--space-4);
  }

  .conversion-source,
  .conversion-output {
    width: min(100%, 22rem);
    margin-inline: auto;
    text-align: center;
  }

  .conversion-arrow span {
    display: inline-block;
    transform: rotate(90deg);
  }

  .conversion-engine {
    width: min(100%, 13rem);
    min-height: 7rem;
    margin-inline: auto;
  }

  .vertical-frame {
    width: min(5.2rem, 23vw);
  }

  .journey {
    padding: var(--space-4);
  }

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

  .demo-stage__message {
    gap: var(--space-4);
    align-items: start;
  }

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

  .demo-slot--source {
    grid-column: 1 / -1;
  }

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

  .pilot__intro .eyebrow {
    margin-bottom: 0;
  }

  .faq-list summary {
    min-height: 4.5rem;
    padding-right: 2.5rem;
  }

  .faq-list details p {
    padding-right: 0;
  }

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

/* ================================================================
   16. Small mobile
   ================================================================ */

@media (max-width: 22rem) {
  .nav-toggle__label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
  }

  .hero h1 {
    font-size: 2.65rem;
  }

  .contact-form-card {
    padding: var(--space-4);
  }

  .contact-form-card__button {
    padding-inline: var(--space-2);
    font-size: 0.85rem;
  }
}

/* ================================================================
   17. Reduced motion
   動きを減らす設定の利用者には、アニメーションを止めます。
   ================================================================ */

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

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