/* =========================================================
   AI FORUM Day5 — Community Site Styles
   ========================================================= */

:root {
  --c-bg:        #ffffff;
  --c-bg-soft:   #f7f7f9;
  --c-bg-dark:   #0d0d10;
  --c-ink:       #14141a;
  --c-ink-2:     #3a3a44;
  --c-ink-3:     #6c6c78;
  --c-line:      #e6e6ea;
  --c-pink:      #ec5b9f;
  --c-pink-soft: #fde3ee;
  --c-grad:      linear-gradient(90deg, #ff3d6e 0%, #ff8a3d 18%, #ffd23d 35%, #4ed25b 52%, #4eb6ff 68%, #6e4ed2 84%, #ff3dbb 100%);
  --c-grad-soft: linear-gradient(135deg, #fff 0%, #fff5fb 55%, #fde3ee 100%);
  --shadow-card: 0 12px 40px rgba(20, 20, 26, 0.06);
  --shadow-hi:   0 20px 60px rgba(20, 20, 26, 0.12);
  --r-md: 14px;
  --r-lg: 22px;
  --maxw: 1180px;
  --font-jp: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --font-en: "Inter", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-jp);
  color: var(--c-ink);
  background: var(--c-bg);
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  letter-spacing: 0.02em;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
em { font-style: normal; background: var(--c-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 28px;
}

/* =========================================================
   Header
   ========================================================= */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid rgba(230, 230, 234, 0);
  transition: border-color .3s, background .3s;
}
.site-header.scrolled {
  border-bottom-color: var(--c-line);
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-mark {
  width: 36px;
  height: 36px;
  object-fit: contain;
  flex-shrink: 0;
  display: block;
}
.brand-text {
  display: flex; flex-direction: column; line-height: 1.1;
}
.brand-en {
  font-family: var(--font-en);
  font-size: 14px;
  letter-spacing: 0.22em;
  color: var(--c-ink);
}
.brand-en strong { font-weight: 700; }
.brand-jp {
  font-size: 10px;
  color: var(--c-ink-3);
  letter-spacing: 0.18em;
  margin-top: 2px;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.site-nav a {
  font-size: 13px;
  font-weight: 500;
  color: var(--c-ink-2);
  position: relative;
  transition: color .2s;
}
.site-nav a:hover { color: var(--c-ink); }
.site-nav a:not(.nav-cta)::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  background: var(--c-grad);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s ease;
}
.site-nav a:not(.nav-cta):hover::after { transform: scaleX(1); }
.nav-cta {
  background: var(--c-ink);
  color: #fff !important;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.08em;
  transition: transform .2s, box-shadow .2s;
}
.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(20,20,26,.18);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  width: 36px; height: 36px;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: 0;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-ink);
  border-radius: 2px;
  margin: 0 auto;
  transform-origin: center;
  transition: transform .25s ease, opacity .25s ease;
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =========================================================
   Hero
   ========================================================= */
.hero {
  position: relative;
  min-height: 100vh;
  padding: 132px 0 80px;
  overflow: hidden;
  background: var(--c-bg);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 50% at 80% 20%, rgba(255, 138, 61, .14), transparent 70%),
    radial-gradient(60% 50% at 10% 80%, rgba(78, 182, 255, .12), transparent 70%),
    radial-gradient(40% 40% at 50% 100%, rgba(236, 91, 159, .12), transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 56px;
  align-items: center;
}
.eyebrow {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.4em;
  color: var(--c-ink-3);
  margin: 0 0 24px;
  text-transform: uppercase;
}
.hero-title {
  margin: 0 0 28px;
  line-height: 1.05;
}
.title-en {
  display: block;
  font-family: var(--font-en);
  font-weight: 300;
  font-size: clamp(40px, 6vw, 76px);
  letter-spacing: 0.06em;
  color: var(--c-ink);
}
.title-en strong { font-weight: 700; }
.title-tag {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.4em;
  background: var(--c-ink);
  color: #fff;
  padding: 6px 14px;
  border-radius: 4px;
}
.hero-lead {
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 500;
  line-height: 1.7;
  margin: 0 0 24px;
  color: var(--c-ink);
}
.hero-sub {
  color: var(--c-ink-3);
  font-size: 14px;
  line-height: 2;
  margin: 0 0 40px;
}
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.06em;
  padding: 16px 28px;
  border-radius: 999px;
  transition: transform .2s, box-shadow .2s, background .2s, color .2s;
  border: 1.5px solid transparent;
  cursor: pointer;
}
.btn-primary {
  background: var(--c-ink);
  color: #fff;
  box-shadow: 0 10px 28px rgba(20,20,26,.18);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 36px rgba(20,20,26,.24);
}
.btn-ghost {
  background: transparent;
  color: var(--c-ink);
  border-color: var(--c-ink);
}
.btn-ghost:hover {
  background: var(--c-ink);
  color: #fff;
}
.btn-light {
  background: #fff;
  color: var(--c-ink);
}
.btn-light:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 36px rgba(0,0,0,.18);
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 520px;
  margin: 0 auto;
}
.hero-ring {
  width: 100%;
  height: 100%;
  max-width: 520px;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  filter: drop-shadow(0 30px 60px rgba(236, 91, 159, .18));
  animation: floaty 8s ease-in-out infinite;
}
@keyframes floaty {
  0%,100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-12px) rotate(2deg); }
}
.hero-scroll {
  position: absolute;
  bottom: 36px; left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.35em;
  color: var(--c-ink-3);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-transform: uppercase;
}
.hero-scroll span {
  display: block;
  width: 1px;
  height: 36px;
  background: var(--c-ink-3);
  position: relative;
  overflow: hidden;
}
.hero-scroll span::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--c-ink);
  animation: scrollLine 2s ease-in-out infinite;
}
@keyframes scrollLine {
  0% { transform: translateY(-100%); }
  100% { transform: translateY(100%); }
}

/* =========================================================
   Sections
   ========================================================= */
.section { padding: 120px 0; position: relative; }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 64px; }
.section-num {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.45em;
  color: var(--c-ink-3);
  margin: 0 0 14px;
}
.section-title {
  font-size: clamp(28px, 3.4vw, 42px);
  margin: 0 0 18px;
  letter-spacing: 0.04em;
  line-height: 1.4;
}
.section-lead {
  color: var(--c-ink-2);
  font-size: 15px;
  line-height: 2;
  margin: 0;
}
.section-head--light .section-num,
.section-head--light .section-lead { color: rgba(255,255,255,.65); }
.section-head--light .section-title { color: #fff; }

/* --- About --- */
.section-about { background: var(--c-bg); }
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 64px;
  align-items: center;
}
.about-text p {
  font-size: 15px;
  line-height: 2.05;
  margin: 0 0 18px;
  color: var(--c-ink-2);
}
.about-quote {
  margin: 32px 0 0;
  padding: 28px;
  border-left: 3px solid transparent;
  border-image: var(--c-grad);
  border-image-slice: 1;
  background: linear-gradient(90deg, rgba(236,91,159,.06), transparent);
  font-size: 16px;
  font-weight: 500;
  color: var(--c-ink);
  line-height: 1.9;
}
.about-quote span {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--c-ink-3);
  font-weight: 400;
}
.about-visual {
  display: flex;
  justify-content: center;
}
.about-visual img {
  width: 100%;
  max-width: 380px;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  margin: 0 auto;
  filter: drop-shadow(0 30px 50px rgba(110, 78, 210, .14));
}

/* --- Approach --- */
.section-approach { background: var(--c-bg-soft); }
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.card {
  background: #fff;
  border-radius: var(--r-lg);
  padding: 40px 32px 36px;
  box-shadow: var(--shadow-card);
  transition: transform .25s, box-shadow .25s;
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--c-grad);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hi); }
.card:hover::before { transform: scaleX(1); }
.card-no {
  font-family: var(--font-en);
  font-size: 24px;
  margin: 0 0 12px;
  background: var(--c-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 700;
}
.card-title {
  margin: 0 0 18px;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.4;
}
.card-body {
  margin: 0;
  font-size: 14px;
  line-height: 2;
  color: var(--c-ink-2);
}

/* --- Rules --- */
.section-rules {
  background: var(--c-bg-dark);
  color: #fff;
}
.rule-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.rule-list li {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.08);
  padding: 36px 30px;
  border-radius: var(--r-lg);
  transition: border-color .25s, background .25s;
}
.rule-list li:hover {
  border-color: rgba(255,255,255,.25);
  background: rgba(255,255,255,.07);
}
.rule-no {
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.4em;
  color: rgba(255,255,255,.5);
  margin: 0 0 18px;
}
.rule-list h3 {
  margin: 0 0 14px;
  font-size: 18px;
  line-height: 1.6;
  letter-spacing: 0.04em;
}
.rule-list p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.95;
  color: rgba(255,255,255,.72);
}

/* --- Event highlight --- */
.section-event {
  background: var(--c-grad-soft);
}
.event-card {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  background: #fff;
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-hi);
}
.event-card-left {
  padding: 56px 48px;
  background: #fff;
}
.event-tag {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.4em;
  color: var(--c-pink);
  background: var(--c-pink-soft);
  padding: 6px 14px;
  border-radius: 999px;
  margin: 0 0 24px;
}
.event-title {
  font-size: clamp(24px, 2.6vw, 34px);
  line-height: 1.45;
  margin: 0 0 22px;
  letter-spacing: 0.04em;
}
.event-desc {
  font-size: 14.5px;
  line-height: 2;
  color: var(--c-ink-2);
  margin: 0 0 32px;
}
.event-meta {
  background: linear-gradient(160deg, #ffe2ee 0%, #ffd1e3 55%, #ffb7d0 100%);
  margin: 0;
  padding: 56px 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 22px;
}
.event-meta > div {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 14px;
  align-items: baseline;
}
.event-meta dt {
  font-size: 11px;
  letter-spacing: 0.25em;
  background: rgba(20,20,26,.85);
  color: #fff;
  padding: 4px 10px;
  border-radius: 4px;
  text-align: center;
  font-weight: 500;
}
.event-meta dd {
  margin: 0;
  font-size: 15px;
  font-weight: 500;
  color: var(--c-ink);
}
.event-meta dd strong {
  display: block;
  font-size: 19px;
  letter-spacing: 0.04em;
}
.meta-pre {
  display: block;
  font-size: 12px;
  color: var(--c-ink-3);
  font-weight: 400;
  margin-bottom: 2px;
}

/* --- Partners --- */
.section-partners { background: var(--c-bg); }
.founders-block {
  margin-bottom: 56px;
}
.founders-label {
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--c-ink-3);
  text-align: center;
  margin: 0 0 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
}
.founders-label::before,
.founders-label::after {
  content: '';
  width: 56px;
  height: 1px;
  background: var(--c-line);
}
.founders-label span {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-ink-3);
  opacity: .8;
  margin-left: 4px;
}
.founders-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}
.founder-card {
  background: var(--c-bg-soft);
  border-radius: var(--r-md);
  padding: 28px 16px 22px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: transform .25s, box-shadow .25s, background .25s;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 14px;
  min-height: 220px;
  color: var(--c-ink);
  text-decoration: none;
  cursor: pointer;
}
.founder-card:visited,
.founder-card:active { color: var(--c-ink); }
.founder-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--c-grad);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s ease;
}
.founder-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  background: #fff;
}
.founder-card:hover::before { transform: scaleX(1); }
.founder-logo {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 70px;
}
.founder-logo img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
}
.founder-name {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.55;
  font-weight: 700;
  color: var(--c-ink);
  letter-spacing: 0.02em;
}
.founder-link {
  font-family: var(--font-en);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--c-ink-3);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity .25s ease, transform .25s ease, color .25s ease;
  margin-top: 2px;
}
.founder-card:hover .founder-link {
  opacity: 1;
  transform: translateY(0);
  color: var(--c-pink);
}
/* --- CTA Band --- */
.cta-band {
  position: relative;
  padding: 88px 0;
  background: var(--c-ink);
  color: #fff;
  overflow: hidden;
  text-align: center;
}
.cta-band::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 50% at 20% 30%, rgba(255, 61, 110, .18), transparent 60%),
    radial-gradient(60% 50% at 80% 70%, rgba(78, 182, 255, .18), transparent 60%);
  pointer-events: none;
}
.cta-band h2 {
  position: relative;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.7;
  margin: 0 0 32px;
  letter-spacing: 0.04em;
}

/* --- Footer --- */
.site-footer {
  background: #0a0a0d;
  color: rgba(255,255,255,.7);
  padding: 56px 0 40px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 32px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}
.footer-brand img {
  width: 42px;
  height: 42px;
  object-fit: contain;
  flex-shrink: 0;
}
.footer-en {
  font-family: var(--font-en);
  font-size: 14px;
  letter-spacing: 0.22em;
  margin: 0;
  color: #fff;
}
.footer-en strong { font-weight: 700; }
.footer-jp {
  font-size: 11px;
  color: rgba(255,255,255,.55);
  letter-spacing: 0.18em;
  margin: 4px 0 0;
}
.footer-nav {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-nav a {
  font-size: 13px;
  color: rgba(255,255,255,.7);
  transition: color .2s;
}
.footer-nav a:hover { color: #fff; }
.footer-copy {
  grid-column: 1 / -1;
  margin: 36px 0 0;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,.08);
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: rgba(255,255,255,.4);
}

/* =========================================================
   Event Page Specific
   ========================================================= */
.event-page {
  padding-top: 110px;
}
.event-hero {
  position: relative;
  padding: 64px 0 80px;
  background: linear-gradient(160deg, #fff 0%, #fde3ee 60%, #f7c5db 100%);
  overflow: hidden;
}
.event-hero::before {
  content: '';
  position: absolute;
  right: -200px; top: -120px;
  width: 720px; height: 720px;
  background: radial-gradient(circle, rgba(236,91,159,.32), transparent 65%);
  pointer-events: none;
}
.event-hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 56px;
  align-items: center;
}
.event-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.4em;
  color: var(--c-pink);
  margin: 0 0 20px;
}
.event-eyebrow::before {
  content: '';
  width: 28px; height: 1px;
  background: var(--c-pink);
}
.event-hero h1 {
  font-size: clamp(34px, 5vw, 56px);
  letter-spacing: 0.04em;
  margin: 0 0 22px;
  line-height: 1.3;
  color: var(--c-ink);
}
.event-hero h1 .accent { color: var(--c-pink); }
.event-hero .sub {
  font-size: 16px;
  margin: 0 0 32px;
  color: var(--c-ink-2);
  line-height: 2;
}
.event-hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  aspect-ratio: 1 / 1;
  max-width: 460px;
  margin: 0 auto;
  width: 100%;
}
.event-hero-visual::before {
  content: 'Day 5';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-en);
  font-size: 44px;
  letter-spacing: 0.2em;
  color: rgba(255,255,255,.6);
  font-weight: 300;
  z-index: 2;
  pointer-events: none;
}
.event-hero-visual img {
  width: 100%;
  height: 100%;
  max-width: 460px;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.key-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  background: #fff;
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-hi);
  overflow: hidden;
  margin: -40px auto 0;
  position: relative;
  z-index: 3;
  max-width: var(--maxw);
}
.key-meta > div {
  padding: 28px 26px;
  border-right: 1px solid var(--c-line);
}
.key-meta > div:last-child { border-right: 0; }
.key-meta dt {
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--c-pink);
  margin: 0 0 10px;
  font-weight: 500;
}
.key-meta dd {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-ink);
  letter-spacing: 0.04em;
  line-height: 1.5;
}
.key-meta dd small {
  display: block;
  font-size: 11px;
  color: var(--c-ink-3);
  font-weight: 400;
  letter-spacing: 0.08em;
  margin-top: 4px;
}

/* Event detail blocks */
.event-detail {
  padding: 80px 0 100px;
  background: #fff;
}
.detail-grid {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 56px;
  margin-bottom: 64px;
}
.detail-body h2 {
  font-size: 26px;
  letter-spacing: 0.04em;
  margin: 0 0 20px;
  position: relative;
  padding-left: 18px;
}
.detail-body h2::before {
  content: '';
  position: absolute;
  left: 0; top: 8px; bottom: 8px;
  width: 4px;
  background: var(--c-grad);
  border-radius: 4px;
}
.detail-body p {
  font-size: 15px;
  line-height: 2;
  color: var(--c-ink-2);
  margin: 0 0 18px;
}
.program-box {
  background: var(--c-pink-soft);
  border-radius: var(--r-lg);
  padding: 32px 30px;
}
.program-box h3 {
  display: inline-block;
  background: #fff;
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--c-pink);
  margin: 0 0 18px;
}
.program-box p {
  margin: 0;
  font-size: 14px;
  line-height: 2;
  color: var(--c-ink);
  font-weight: 500;
}
.program-box strong { color: var(--c-pink); }

.signup-band {
  background: var(--c-ink);
  color: #fff;
  border-radius: var(--r-lg);
  padding: 56px 48px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 32px;
  position: relative;
  overflow: hidden;
}
.signup-band::before {
  content: '';
  position: absolute;
  right: -120px; top: -80px;
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(236,91,159,.4), transparent 65%);
  pointer-events: none;
}
.signup-band h2 {
  font-size: clamp(22px, 2.6vw, 30px);
  margin: 0 0 8px;
  letter-spacing: 0.04em;
}
.signup-band p {
  margin: 0;
  font-size: 14px;
  color: rgba(255,255,255,.7);
}
.signup-band .btn-light { font-size: 16px; padding: 18px 36px; }

.event-back {
  text-align: center;
  padding: 40px 0;
  background: var(--c-bg-soft);
}
.event-back a {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--c-ink-2);
  border-bottom: 1px solid var(--c-ink-2);
  padding-bottom: 2px;
}

/* =========================================================
   Reveal on scroll
   ========================================================= */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .8s ease, transform .8s ease;
}
.reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 960px) {
  .hero { padding-top: 110px; min-height: auto; }
  .hero-inner { grid-template-columns: 1fr; gap: 32px; }
  .hero-visual { order: -1; }
  .hero-ring { max-width: 320px; }
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .about-visual img { max-width: 320px; }
  .card-grid,
  .rule-list { grid-template-columns: 1fr; }
  .founders-grid { grid-template-columns: repeat(2, 1fr); }
  .event-card { grid-template-columns: 1fr; }
  .event-card-left, .event-meta { padding: 36px 28px; }
  .event-hero-inner { grid-template-columns: 1fr; gap: 24px; }
  .event-hero-visual { order: -1; }
  .key-meta { grid-template-columns: 1fr 1fr; }
  .key-meta > div:nth-child(2) { border-right: 0; }
  .key-meta > div { border-bottom: 1px solid var(--c-line); }
  .key-meta > div:nth-last-child(-n+2) { border-bottom: 0; }
  .detail-grid { grid-template-columns: 1fr; gap: 32px; }
  .signup-band { grid-template-columns: 1fr; text-align: center; }
  .footer-inner { grid-template-columns: 1fr; text-align: center; }
  .footer-brand { justify-content: center; }
  .footer-nav { justify-content: center; }
}

@media (max-width: 720px) {
  .nav-wrap { height: 60px; }
  .brand-mark { width: 30px; height: 30px; }
  .brand-en { font-size: 12px; letter-spacing: 0.18em; }
  .brand-jp { font-size: 9px; letter-spacing: 0.16em; }
  .nav-toggle { display: flex; }

  .site-nav {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: #fff;
    padding: 24px 24px 32px;
    gap: 4px;
    border-top: 1px solid var(--c-line);
    box-shadow: 0 16px 40px rgba(20, 20, 26, 0.08);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    pointer-events: none;
    transition: opacity .25s ease, transform .25s ease, visibility 0s linear .25s;
  }
  .site-nav.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
    transition: opacity .25s ease, transform .25s ease, visibility 0s linear 0s;
  }
  .site-nav a {
    font-size: 15px;
    padding: 14px 4px;
    border-bottom: 1px solid var(--c-line);
  }
  .site-nav a:not(.nav-cta)::after { display: none; }
  .site-nav .nav-cta {
    margin-top: 12px;
    text-align: center;
    border-bottom: 0;
    padding: 14px 18px;
  }

  .hero { padding-top: 100px; }
  .section { padding: 88px 0; }
  .section-head { margin-bottom: 44px; }
  .container { padding: 0 20px; }
}