:root {
  --ink: #17232a;
  --muted: #5f6f75;
  --teal: #0a8b86;
  --teal-dark: #00646d;
  --teal-soft: #dff4f1;
  --orange: #ff7417;
  --orange-dark: #dc5f0b;
  --amber: #f6bd4f;
  --cream: #fff8eb;
  --paper: #fffdf8;
  --line: rgba(23, 35, 42, 0.13);
  --shadow: 0 18px 40px rgba(38, 48, 51, 0.12);
  --radius: 8px;
  --shell: min(1120px, calc(100% - 48px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 20% 0%, rgba(255, 116, 23, 0.08), transparent 28rem),
    linear-gradient(180deg, #fffaf1 0%, #fffdf8 55%, #f7fbfa 100%);
  font-family:
    "Hiragino Kaku Gothic ProN", "Yu Gothic", "YuGothic", "Noto Sans JP",
    system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background-image:
    linear-gradient(rgba(23, 35, 42, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 35, 42, 0.025) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: linear-gradient(180deg, transparent, #000 15%, #000 85%, transparent);
}

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

svg {
  display: block;
}

.page-shell {
  width: var(--shell);
  margin-inline: auto;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 22px max(24px, calc((100vw - 1120px) / 2));
  transition:
    background-color 180ms ease,
    box-shadow 180ms ease,
    padding 180ms ease;
}

.site-header.is-scrolled {
  padding-block: 13px;
  background: rgba(255, 253, 248, 0.9);
  box-shadow: 0 8px 24px rgba(23, 35, 42, 0.08);
  backdrop-filter: blur(18px);
}

.brand {
  display: grid;
  line-height: 1;
}

.brand__name {
  font-size: clamp(1.65rem, 3vw, 2.1rem);
  font-weight: 900;
  letter-spacing: 0;
}

.brand__sub {
  margin-top: 3px;
  font-size: 0.76rem;
  font-weight: 800;
}

.site-nav {
  display: flex;
  gap: clamp(22px, 4vw, 56px);
  align-items: center;
  font-size: 0.92rem;
  font-weight: 800;
}

.site-nav a {
  position: relative;
  padding: 8px 0;
}

.site-nav a::after {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  content: "";
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 180ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.header-cta,
.primary-btn,
.secondary-btn {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  justify-content: center;
  min-height: 56px;
  border-radius: 999px;
  font-weight: 900;
  line-height: 1;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    background-color 180ms ease,
    color 180ms ease;
}

.header-cta {
  min-height: 50px;
  padding: 0 28px;
  color: #fff;
  background: var(--orange);
  box-shadow: 0 12px 26px rgba(255, 116, 23, 0.3);
}

.header-cta svg,
.primary-btn svg,
.secondary-btn svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 3;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.header-cta svg {
  width: 18px;
  height: 18px;
}

.header-cta:hover,
.primary-btn:hover,
.secondary-btn:hover {
  transform: translateY(-2px);
}

.hero {
  position: relative;
  min-height: 690px;
  padding: 144px 0 86px;
  overflow: hidden;
  background-image: url("assets/reboost-visual.png");
  background-repeat: no-repeat;
  background-position: center top;
  background-size: cover;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255, 253, 248, 0.97) 0%, rgba(255, 253, 248, 0.88) 34%, rgba(255, 253, 248, 0.22) 64%, rgba(255, 253, 248, 0) 100%),
    linear-gradient(180deg, rgba(255, 253, 248, 0.7) 0%, rgba(255, 253, 248, 0) 42%, rgba(255, 248, 235, 0.84) 100%);
}

.hero__inner {
  position: relative;
  z-index: 1;
}

.hero__copy {
  max-width: min(860px, 72vw);
}

.eyebrow {
  margin: 0 0 24px;
  color: var(--teal);
  font-size: 1.05rem;
  font-weight: 900;
}

.hero h1 {
  margin: 0;
  font-size: clamp(3.5rem, 5.4vw, 5.85rem);
  font-weight: 950;
  line-height: 1.18;
  letter-spacing: 0;
  word-break: keep-all;
}

.hero-title-line {
  display: block;
}

.hero-title-line--wide {
  white-space: nowrap;
}

.hero-title-highlight {
  color: var(--orange);
  white-space: nowrap;
}

.hero__lead {
  margin: 24px 0 0;
  color: var(--teal);
  font-size: clamp(1.15rem, 2.2vw, 1.7rem);
  font-weight: 900;
}

.hero__body {
  margin: 32px 0 0;
  font-size: clamp(1rem, 1.7vw, 1.25rem);
  font-weight: 800;
  line-height: 1.95;
}

.organizers {
  margin: 28px 0 0;
  font-size: clamp(0.95rem, 1.5vw, 1.12rem);
  font-weight: 900;
}

.organizers p {
  display: flex;
  gap: 10px;
  align-items: center;
  margin: 0 0 8px;
  line-height: 1.5;
}

.organizers span {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  min-width: 48px;
  min-height: 26px;
  padding: 0 10px;
  color: var(--teal-dark);
  font-size: 0.78rem;
  background: rgba(10, 139, 134, 0.1);
  border: 1px solid rgba(10, 139, 134, 0.18);
  border-radius: 999px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 28px;
}

.primary-btn {
  min-width: min(100%, 300px);
  padding: 0 32px;
  color: #fff;
  background: linear-gradient(135deg, var(--orange), #ff9b2f);
  box-shadow: 0 16px 30px rgba(255, 116, 23, 0.32);
}

.secondary-btn {
  min-width: min(100%, 250px);
  padding: 0 28px;
  color: var(--teal-dark);
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(0, 100, 109, 0.24);
  box-shadow: 0 14px 28px rgba(34, 70, 72, 0.08);
}

.event-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: -52px;
  position: relative;
  z-index: 4;
}

.info-card {
  display: flex;
  gap: 20px;
  align-items: center;
  min-height: 118px;
  padding: 24px 26px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(23, 35, 42, 0.08);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.info-card__icon {
  display: grid;
  flex: 0 0 48px;
  width: 48px;
  height: 48px;
  place-items: center;
  color: var(--teal);
}

.info-card__icon svg {
  width: 44px;
  height: 44px;
  stroke: currentColor;
  stroke-width: 1.8;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.info-card p {
  margin: 0 0 4px;
  color: var(--muted);
  font-weight: 900;
}

.info-card strong {
  display: block;
  font-size: clamp(1rem, 1.7vw, 1.35rem);
  line-height: 1.35;
}

.info-card__sub {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  margin-top: 9px;
  padding: 0 12px;
  color: var(--orange-dark);
  font-size: clamp(0.94rem, 1.35vw, 1.08rem);
  font-weight: 950;
  line-height: 1;
  background: rgba(255, 116, 23, 0.11);
  border: 1px solid rgba(255, 116, 23, 0.18);
  border-radius: 999px;
}

.intro {
  position: relative;
  display: grid;
  grid-template-columns: 98px 1fr;
  gap: 12px;
  align-items: center;
  margin-top: 34px;
  padding: 34px 42px;
  overflow: hidden;
  text-align: center;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.72), rgba(255, 242, 214, 0.92)),
    radial-gradient(circle at 18% 20%, rgba(255, 188, 79, 0.22), transparent 15rem);
  border: 1px solid rgba(255, 160, 42, 0.18);
  border-radius: var(--radius);
  box-shadow: 0 14px 30px rgba(132, 99, 41, 0.1);
}

.intro::after {
  position: absolute;
  right: 30px;
  bottom: 14px;
  width: 150px;
  height: 82px;
  content: "";
  opacity: 0.32;
  background:
    radial-gradient(circle at 22px 28px, transparent 13px, #d99633 14px, #d99633 16px, transparent 17px),
    radial-gradient(circle at 72px 28px, transparent 13px, #d99633 14px, #d99633 16px, transparent 17px),
    radial-gradient(circle at 120px 28px, transparent 13px, #d99633 14px, #d99633 16px, transparent 17px),
    linear-gradient(#d99633, #d99633) 22px 48px / 2px 34px no-repeat,
    linear-gradient(#d99633, #d99633) 72px 48px / 2px 34px no-repeat,
    linear-gradient(#d99633, #d99633) 120px 48px / 2px 34px no-repeat;
}

.intro__icon {
  width: 72px;
  height: 72px;
  color: var(--amber);
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.intro h2 {
  margin: 0 0 18px;
  font-size: clamp(2rem, 4vw, 3.1rem);
  line-height: 1.25;
  letter-spacing: 0;
}

.intro p {
  max-width: 860px;
  margin: 0 auto 10px;
  font-weight: 800;
  line-height: 2;
}

.numbered-section {
  position: relative;
  margin-top: 32px;
  padding: 70px 38px 44px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid rgba(23, 35, 42, 0.08);
  border-radius: var(--radius);
  box-shadow: 0 14px 32px rgba(34, 54, 57, 0.08);
}

.section-ribbon {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  display: flex;
  gap: 14px;
  align-items: center;
  width: 240px;
  height: 68px;
  padding: 0 32px 0 22px;
  color: #fff;
  background: transparent;
}

.section-ribbon::before {
  position: absolute;
  inset: 0;
  z-index: -1;
  content: "";
  background: linear-gradient(135deg, var(--teal), var(--teal-dark));
  border-top-left-radius: var(--radius);
  clip-path: polygon(0 0, 100% 0, 86% 100%, 0 100%);
}

.section-ribbon strong {
  font-size: 2.1rem;
  line-height: 1;
}

.section-ribbon span {
  font-size: 0.88rem;
  font-weight: 900;
  white-space: nowrap;
}

.section-heading {
  max-width: 920px;
  margin: 0 auto 34px;
  text-align: center;
}

.section-heading h2 {
  margin: 0 0 12px;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.25;
  letter-spacing: 0;
}

.section-heading p {
  margin: 0 0 18px;
  color: var(--teal);
  font-size: clamp(1.25rem, 2.6vw, 2rem);
  font-weight: 950;
  line-height: 1.45;
}

.section-heading small {
  display: block;
  max-width: 820px;
  margin: 0 auto;
  color: #263238;
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.9;
}

.flow-cards {
  display: grid;
  grid-template-columns: 1fr 42px 1fr 42px 1fr;
  gap: 12px;
  align-items: center;
}

.flow-card {
  min-height: 228px;
  overflow: hidden;
  text-align: center;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.flow-card h3 {
  margin: 0;
  padding: 16px;
  color: #fff;
  font-size: 1.05rem;
}

.flow-card--gray h3 {
  background: #9a9a9a;
}

.flow-card--teal h3 {
  background: rgba(10, 139, 134, 0.55);
}

.flow-card--orange h3 {
  background: var(--orange);
}

.flow-card p {
  margin: 14px 18px 0;
  font-size: 1.08rem;
  font-weight: 950;
}

.flow-card__art {
  display: grid;
  height: 108px;
  place-items: center;
  margin-top: 6px;
}

.card-icon {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.card-icon--flow {
  width: 118px;
  height: 104px;
}

.card-icon--role {
  width: 86px;
  height: 86px;
}

.card-icon--method {
  width: 112px;
  height: 112px;
}

.flow-arrow {
  color: var(--teal);
}

.flow-arrow svg {
  width: 34px;
  height: 34px;
  margin: auto;
  stroke: currentColor;
  stroke-width: 3;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.role-grid,
.method-grid {
  display: grid;
  gap: 22px;
}

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

.role-card,
.method-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 22px rgba(42, 63, 65, 0.05);
}

.role-card {
  display: grid;
  justify-items: center;
  min-height: 232px;
  padding: 28px 24px;
  text-align: center;
}

.role-card__icon {
  display: grid;
  width: 90px;
  height: 90px;
  margin-bottom: 10px;
  place-items: center;
  color: inherit;
  border-radius: 0;
}

.role-card__icon--teal {
  background: transparent;
}

.role-card__icon--orange {
  background: transparent;
}

.role-card p {
  margin: 0 0 8px;
  color: var(--teal);
  font-weight: 950;
}

.role-card h3 {
  margin: 0 0 12px;
  color: var(--teal);
  font-size: clamp(1.45rem, 2.4vw, 2rem);
}

.role-card:nth-child(2) h3 {
  color: var(--orange);
}

.role-card small {
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 800;
  line-height: 1.75;
}

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

.method-card {
  position: relative;
  min-height: 292px;
  padding: 24px 20px 22px;
}

.step-badge {
  display: grid;
  width: 50px;
  height: 50px;
  place-items: center;
  color: #fff;
  border-radius: 50%;
  font-size: 1.2rem;
  font-weight: 950;
}

.step-badge--teal {
  background: var(--teal);
}

.step-badge--orange {
  background: var(--orange);
}

.method-card__icon {
  display: grid;
  height: 116px;
  place-items: center;
}

.method-card h3 {
  margin: 0 0 10px;
  color: var(--teal-dark);
  font-size: 1.12rem;
  line-height: 1.5;
}

.method-card p {
  margin: 0;
  font-size: 0.94rem;
  font-weight: 800;
  line-height: 1.85;
}

.event-banner {
  position: relative;
  margin-top: 38px;
  overflow: hidden;
  color: #fff;
  background-image:
    linear-gradient(90deg, rgba(0, 84, 91, 0.96) 0%, rgba(0, 106, 116, 0.88) 36%, rgba(0, 112, 127, 0.25) 68%, rgba(0, 112, 127, 0.12) 100%),
    url("assets/reboost-visual.png");
  background-position: center, center 66%;
  background-size: cover;
}

.event-banner::before {
  position: absolute;
  inset: 0;
  content: "";
  background:
    linear-gradient(180deg, rgba(0, 42, 47, 0.06), rgba(0, 42, 47, 0.18)),
    repeating-linear-gradient(100deg, rgba(255, 255, 255, 0.08) 0 1px, transparent 1px 72px);
}

.event-banner__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
  align-items: center;
  min-height: 430px;
  padding-block: 56px 64px;
}

.event-banner__label {
  margin: 0 0 16px;
  font-size: 1rem;
  font-weight: 950;
  letter-spacing: 0.04em;
}

.event-banner h2 {
  margin: 0 0 18px;
  font-size: clamp(4rem, 9vw, 6.4rem);
  line-height: 1;
  letter-spacing: 0;
}

.event-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 18px;
}

.event-meta span {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 18px;
  color: #fff;
  font-size: clamp(1rem, 1.6vw, 1.18rem);
  font-weight: 950;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.26);
  border-radius: 999px;
  backdrop-filter: blur(10px);
}

.event-meta span:first-child {
  color: #1d2225;
  background: #ffe14b;
  border-color: rgba(255, 225, 75, 0.7);
}

.event-banner p {
  margin: 0 0 12px;
  font-size: clamp(1rem, 1.8vw, 1.22rem);
  font-weight: 900;
}

.address {
  display: flex;
  gap: 9px;
  align-items: center;
}

.address svg {
  flex: 0 0 22px;
  width: 22px;
  height: 22px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.event-banner h3 {
  margin: 28px 0 22px;
  font-size: clamp(1.7rem, 4vw, 2.7rem);
  line-height: 1.35;
}

.event-banner h3 span {
  color: #ffe14b;
}

.primary-btn--wide {
  min-width: min(100%, 460px);
}

.event-badge {
  display: grid;
  width: 270px;
  aspect-ratio: 1;
  place-items: center;
  margin-left: auto;
  color: var(--ink);
  text-align: center;
  background: rgba(255, 255, 255, 0.9);
  border: 2px dotted rgba(255, 255, 255, 0.75);
  border-radius: 50%;
  box-shadow:
    0 0 0 16px rgba(255, 255, 255, 0.16),
    0 20px 50px rgba(0, 39, 45, 0.18);
}

.event-badge span {
  font-size: 1.12rem;
  font-weight: 950;
  line-height: 1.9;
}

.event-badge strong {
  color: var(--orange);
  font-size: 1.35rem;
}

.footer {
  padding: 24px 24px 26px;
  color: #fff;
  text-align: center;
  background: #1d2225;
}

.footer p {
  margin: 0 0 8px;
  font-weight: 900;
}

.footer small {
  display: block;
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1.7;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 560ms ease,
    transform 560ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

:focus-visible {
  outline: 3px solid rgba(255, 116, 23, 0.6);
  outline-offset: 4px;
}

@media (max-width: 980px) {
  :root {
    --shell: min(100% - 32px, 760px);
  }

  .site-header {
    gap: 16px;
    padding: 16px;
  }

  .site-nav {
    display: none;
  }

  .hero {
    min-height: 640px;
    padding-top: 128px;
    background-position: 54% top;
  }

  .hero__copy {
    max-width: 100%;
  }

  .hero-title-line--wide {
    white-space: normal;
  }

  .hero__overlay {
    background:
      linear-gradient(90deg, rgba(255, 253, 248, 0.98) 0%, rgba(255, 253, 248, 0.9) 48%, rgba(255, 253, 248, 0.34) 100%),
      linear-gradient(180deg, rgba(255, 253, 248, 0.64) 0%, rgba(255, 253, 248, 0.05) 46%, rgba(255, 248, 235, 0.9) 100%);
  }

  .event-cards,
  .role-grid,
  .method-grid,
  .event-banner__inner {
    grid-template-columns: 1fr;
  }

  .event-cards {
    margin-top: -36px;
  }

  .flow-cards {
    grid-template-columns: 1fr;
  }

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

  .event-badge {
    width: 230px;
    margin: 10px auto 0;
  }
}

@media (max-width: 640px) {
  :root {
    --shell: min(100% - 24px, 560px);
  }

  .site-header {
    align-items: center;
  }

  .brand__name {
    font-size: 1.42rem;
  }

  .brand__sub {
    font-size: 0.62rem;
  }

  .header-cta {
    min-height: 42px;
    padding: 0 14px;
    font-size: 0.82rem;
  }

  .header-cta svg {
    width: 15px;
    height: 15px;
  }

  .hero {
    min-height: auto;
    padding: 108px 0 70px;
    background-position: 60% top;
  }

  .eyebrow {
    margin-bottom: 16px;
  }

  .hero h1 {
    font-size: clamp(3.05rem, 17vw, 4.6rem);
  }

  .hero__lead {
    font-size: 1.08rem;
    line-height: 1.55;
  }

  .hero__body {
    margin-top: 22px;
    line-height: 1.75;
  }

  .hero__actions {
    display: grid;
  }

  .primary-btn,
  .secondary-btn {
    width: 100%;
    min-width: 0;
  }

  .event-cards {
    gap: 12px;
  }

  .info-card {
    min-height: 104px;
    padding: 18px;
  }

  .intro {
    grid-template-columns: 1fr;
    padding: 28px 20px;
  }

  .intro__icon {
    justify-self: center;
    width: 56px;
    height: 56px;
  }

  .intro::after {
    opacity: 0.18;
  }

  .numbered-section {
    padding: 72px 16px 26px;
  }

  .section-ribbon {
    width: 206px;
    height: 60px;
    padding: 0 26px 0 16px;
  }

  .section-heading h2 {
    font-size: 2.08rem;
  }

  .section-heading p {
    font-size: 1.2rem;
  }

  .section-heading small,
  .intro p {
    font-size: 0.92rem;
    line-height: 1.85;
  }

  .role-card,
  .method-card {
    min-height: unset;
  }

  .event-banner__inner {
    min-height: unset;
    padding-block: 42px 50px;
  }

  .event-banner h2 {
    font-size: clamp(3.2rem, 16vw, 4.8rem);
  }

  .address {
    align-items: flex-start;
  }

  .pc-only {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}