/* ===== Design tokens : 和モダン / 暖色 ===== */
:root {
  --paper: #faf4e8;        /* ベース：生成り／ベージュ */
  --paper-2: #f5ecd9;
  --beige: #f0e5cf;        /* section-alt 背景 */
  --beige-deep: #e8d9bc;
  --line: #ddcba6;         /* 罫線：淡い茶 */
  --shu: #c0392b;          /* キーカラー：朱／紅 */
  --aka-deep: #8f2a20;     /* 濃い紅 */
  --daidai: #d2691e;       /* 橙（濃いめオレンジ） */
  --daidai-deep: #b8541a;
  --sumi: #2b2119;         /* 墨：文字色 */
  --muted: #7c6a52;        /* 淡い墨 */
  --gold: #b8860b;
  --radius: 10px;
  --shadow: 0 16px 38px -20px rgba(60, 36, 20, .5);
  --container: 1100px;
  --head-h: 68px;
  --grad-key: linear-gradient(135deg, var(--shu), var(--daidai));
  --grad-key-deep: linear-gradient(135deg, var(--aka-deep), var(--daidai-deep));
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: var(--head-h); }

body {
  margin: 0;
  font-family: "Noto Serif JP", "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  color: var(--sumi);
  background: var(--paper);
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  /* 和紙のような淡い斜めテクスチャ */
  background-image:
    repeating-linear-gradient(45deg, rgba(180, 140, 90, .022) 0 2px, transparent 2px 6px),
    repeating-linear-gradient(-45deg, rgba(180, 140, 90, .022) 0 2px, transparent 2px 6px);
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }

h1, h2, h3, .brand-text, .fact-value, .tt-time {
  font-family: "Shippori Mincho", "Noto Serif JP", serif;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: .5em; padding: 14px 30px; border-radius: var(--radius);
  font-family: "Shippori Mincho", serif; font-weight: 700; font-size: 15px; letter-spacing: .08em;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease, color .15s ease;
  cursor: pointer; border: 0;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--grad-key); color: #fff5ec; box-shadow: 0 12px 26px -12px rgba(192, 57, 43, .85); }
.btn-ghost { background: rgba(255,255,255,.1); color: #fff5ec; border: 1px solid rgba(255,245,236,.5); }
.btn-ghost:hover { background: rgba(255,255,255,.2); }
.btn-outline { background: transparent; color: var(--shu); border: 1.5px solid var(--shu); }
.btn-outline:hover { background: var(--shu); color: var(--paper); }
.btn-lg { padding: 18px 46px; font-size: 17px; }

/* ===== Header ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100; height: var(--head-h);
  background: rgba(43, 33, 25, .82);
  backdrop-filter: blur(10px);
  transition: background .3s ease, box-shadow .3s ease;
  border-bottom: 1px solid rgba(255, 245, 236, .08);
}
.site-header.scrolled { background: rgba(43, 33, 25, .96); box-shadow: 0 6px 22px -14px rgba(0,0,0,.6); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: var(--head-h); }

.brand { display: flex; align-items: center; gap: 12px; color: var(--paper); }
.brand-mark {
  font-family: "Shippori Mincho", serif; font-weight: 800; font-size: 15px; letter-spacing: .06em;
  padding: 8px 11px; border-radius: 8px; color: #fff5ec; background: var(--grad-key);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.15);
}
.brand-text { font-weight: 700; font-size: 16px; line-height: 1.2; display: flex; flex-direction: column; }
.brand-text small { font-weight: 400; font-size: 11px; opacity: .82; letter-spacing: .04em; }

.nav { display: flex; align-items: center; gap: 26px; }
.nav a { color: rgba(255,245,236,.82); font-size: 14px; font-weight: 500; letter-spacing: .06em; position: relative; font-family: "Cormorant Garamond", "Shippori Mincho", serif; }
.nav a:not(.nav-cta):hover { color: #fff5ec; }
.nav a:not(.nav-cta)::after { content: ""; position: absolute; left: 0; bottom: -6px; width: 0; height: 2px; background: var(--daidai); transition: width .2s ease; }
.nav a:not(.nav-cta):hover::after { width: 100%; }
.nav-cta { background: var(--grad-key); color: #fff5ec !important; padding: 9px 20px; border-radius: var(--radius); font-weight: 700; font-family: "Shippori Mincho", serif; letter-spacing: .04em; }
.nav-cta:hover { transform: translateY(-1px); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--paper); transition: .25s; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero ===== */
.hero { position: relative; color: #fff5ec; overflow: hidden; padding: calc(var(--head-h) + 84px) 0 96px; }
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(900px 520px at 12% 115%, rgba(184, 84, 26, .5), transparent 55%),
    linear-gradient(160deg, #3a2418, #2b2119 55%, #241a12);
}
/* 日の丸を思わせる朱の円 */
.hero-bg::before {
  content: ""; position: absolute; top: -80px; right: -60px; width: 420px; height: 420px; border-radius: 50%;
  background: radial-gradient(circle at 38% 38%, #e0563c, var(--shu) 60%, var(--aka-deep));
  box-shadow: 0 30px 80px -20px rgba(192, 57, 43, .6);
  opacity: .92;
}
/* 青海波風の波紋（淡く） */
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(circle at 50% 100%, transparent 58%, rgba(255,245,236,.05) 59% 60%, transparent 61%);
  background-size: 60px 30px;
  opacity: .6;
  mask-image: linear-gradient(to top, black, transparent 45%);
}
.hero-inner { position: relative; z-index: 1; }
.hero-eyebrow { font-family: "Cormorant Garamond", serif; letter-spacing: .3em; font-size: 15px; color: #f2c9a0; margin: 0 0 16px; }
.hero-eyebrow::before { content: "◦"; margin-right: .6em; color: var(--daidai); }
.hero-title { font-size: clamp(40px, 7.2vw, 78px); font-weight: 800; line-height: 1.12; margin: 0 0 24px; letter-spacing: .04em; }
.hero-title span { color: #f2c9a0; }
.hero-lead { font-size: clamp(15px, 2vw, 18px); color: rgba(255,245,236,.86); margin: 0 0 40px; max-width: 660px; }

.hero-facts { list-style: none; margin: 0 0 40px; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; max-width: 840px; }
.hero-facts li {
  background: rgba(255, 245, 236, .06); border: 1px solid rgba(255,245,236,.16);
  border-radius: var(--radius); padding: 20px 22px; backdrop-filter: blur(3px);
}
.fact-label { font-family: "Cormorant Garamond", serif; font-size: 13px; letter-spacing: .28em; color: #f2c9a0; display: block; }
.fact-value { font-size: 28px; font-weight: 700; display: block; line-height: 1.2; margin-top: 4px; }
.fact-value small { font-size: 14px; font-weight: 600; margin-left: 6px; opacity: .82; }
.fact-sub { font-size: 12.5px; color: rgba(255,245,236,.72); display: block; margin-top: 6px; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-hash { margin-top: 28px; font-family: "Cormorant Garamond", serif; letter-spacing: .12em; color: rgba(255,245,236,.62); font-size: 15px; }

/* ===== Sections ===== */
.section { padding: 96px 0; position: relative; }
.section-alt { background: var(--beige); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { text-align: center; margin-bottom: 56px; }
.section-eyebrow { font-family: "Cormorant Garamond", serif; letter-spacing: .28em; text-transform: uppercase; font-size: 15px; color: var(--shu); margin: 0 0 12px; }
.section-eyebrow::before, .section-eyebrow::after { content: "―"; color: var(--daidai); opacity: .6; margin: 0 .7em; }
.section-title { font-size: clamp(27px, 4vw, 40px); font-weight: 800; margin: 0; letter-spacing: .05em; }
.section-note { color: var(--muted); margin: 14px 0 0; font-size: 14px; letter-spacing: .04em; }

/* ===== About ===== */
.about-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: start; }
.about-lead p { font-size: 16.5px; margin: 0 0 20px; }
.about-lead strong { color: var(--aka-deep); font-weight: 700; }
.about-points { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; }
.about-points li {
  display: flex; align-items: center; gap: 18px; padding: 20px 24px;
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  font-weight: 700; box-shadow: var(--shadow); letter-spacing: .03em;
}
.about-points .num {
  flex: 0 0 auto; width: 48px; height: 48px; border-radius: 50%;
  display: grid; place-items: center; font-family: "Shippori Mincho", serif; font-size: 22px;
  color: #fff5ec; background: var(--grad-key); box-shadow: inset 0 0 0 2px rgba(255,255,255,.2);
}
.about-points .pt-icon { width: 26px; height: 26px; }

/* ===== Speakers ===== */
.speakers-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 24px; }
.speaker-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 24px; text-align: center; transition: transform .2s ease, box-shadow .2s ease;
}
.speaker-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.speaker-photo {
  width: 104px; height: 104px; border-radius: 50%; margin: 0 auto 18px; position: relative;
  background: var(--grad-key);
  display: grid; place-items: center; color: #fff5ec; font-size: 36px; font-weight: 800;
  font-family: "Shippori Mincho", serif; overflow: hidden;
  box-shadow: 0 0 0 3px var(--paper), 0 0 0 5px var(--shu);
}
.speaker-photo::after { content: attr(data-initial); }
.speaker-photo img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; }
.speaker-name { font-size: 19px; font-weight: 800; margin: 0 0 4px; letter-spacing: .04em; }
.speaker-role { color: var(--shu); font-size: 13px; font-weight: 600; margin: 0 0 12px; }
.speaker-talk { color: var(--muted); font-size: 13.5px; margin: 0; }
.speaker-tba { border-style: dashed; opacity: .8; }
.speaker-tba .speaker-photo { background: var(--beige-deep); color: var(--muted); box-shadow: 0 0 0 3px var(--paper), 0 0 0 5px var(--line); }

/* ===== Timetable ===== */
.timetable { list-style: none; margin: 0 auto; padding: 0; max-width: 820px; }
.tt-row { display: grid; grid-template-columns: 120px 1fr; gap: 24px; align-items: start; padding: 22px 0; border-bottom: 1px solid var(--line); position: relative; }
.tt-time { font-weight: 800; font-size: 19px; color: var(--shu); white-space: nowrap; letter-spacing: .02em; }
.tt-time small { display: block; font-size: 15px; font-weight: 600; color: var(--muted); font-family: "Shippori Mincho", serif; letter-spacing: .02em; }
.tt-title { font-size: 17px; font-weight: 700; margin: 0; letter-spacing: .03em; }
.tt-speaker { margin: 6px 0 0; color: var(--muted); font-size: 14px; }
.tt-feature .tt-title { color: var(--aka-deep); }
.tt-badge { display: inline-block; vertical-align: middle; font-family: "Shippori Mincho", serif; font-weight: 700; font-size: 14px; letter-spacing: .14em; color: #fff5ec; background: var(--grad-key); padding: 5px 14px; border-radius: 7px; margin-right: 12px; box-shadow: 0 6px 16px -8px rgba(192, 57, 43, .8); }
.tt-break, .tt-party { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; }
.tt-break .tt-title { color: var(--muted); }
.tt-party .tt-title { color: var(--daidai-deep); }

/* ===== Sponsors ===== */
.sponsors-grid { list-style: none; margin: 0 0 48px; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 24px; }
.sponsor-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px 24px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 18px;
  height: 100%; color: inherit;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.sponsor-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--shu); }
.sponsor-card img { width: auto; max-width: 92%; height: 74px; object-fit: contain; }
.sponsor-card img.is-cloudii { height: 56px; }
.sponsor-card img.is-fabo { height: 49px; }
.sponsor-name { font-family: "Shippori Mincho", serif; font-weight: 700; font-size: 15px; letter-spacing: .04em; color: var(--sumi); }
.sponsors-coming { text-align: center; max-width: 620px; margin: 0 auto; }
.sponsors-coming p { font-size: 17px; }
.sponsors-cta { color: var(--muted); font-size: 15px; margin: 0 0 28px; }

/* ===== Access ===== */
.access-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 40px; align-items: stretch; }
.access-info h3 { font-size: 22px; margin: 0 0 20px; letter-spacing: .04em; }
.access-info dl { margin: 0 0 28px; }
.access-info dl > div { display: grid; grid-template-columns: 80px 1fr; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.access-info dt { font-weight: 700; color: var(--shu); font-size: 14px; }
.access-info dd { margin: 0; font-size: 15px; }
.access-map { min-height: 360px; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); border: 1px solid var(--line); }
.access-map iframe { height: 100%; min-height: 360px; }

/* ===== CTA band ===== */
.cta-band { position: relative; text-align: center; color: #fff5ec; padding: 84px 0; overflow: hidden; background: linear-gradient(135deg, #3a2418, var(--aka-deep) 60%, var(--daidai-deep)); }
.cta-band::before { content: ""; position: absolute; top: -60px; left: -40px; width: 260px; height: 260px; border-radius: 50%; background: radial-gradient(circle at 40% 40%, #e0563c, var(--shu) 70%); opacity: .35; }
.cta-band h2 { font-size: clamp(25px, 4vw, 36px); font-weight: 800; margin: 0 0 12px; letter-spacing: .06em; position: relative; }
.cta-band p { color: rgba(255,245,236,.88); margin: 0 0 32px; position: relative; }
.cta-band .btn { position: relative; }

/* ===== Footer ===== */
.site-footer { background: #241a12; color: rgba(255,245,236,.8); padding: 64px 0 0; }
.footer-inner { display: grid; grid-template-columns: 1fr 1.4fr; gap: 48px; padding-bottom: 48px; }
.footer-title { font-family: "Shippori Mincho", serif; font-size: 19px; font-weight: 800; color: #fff5ec; margin: 0 0 8px; letter-spacing: .05em; }
.footer-date { font-family: "Cormorant Garamond", serif; color: #f2c9a0; margin: 0 0 8px; letter-spacing: .08em; }
.footer-hash { font-size: 13px; opacity: .7; margin: 0; }
.footer-meta { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.footer-meta h4 { font-family: "Cormorant Garamond", serif; font-size: 13px; letter-spacing: .14em; color: #f2c9a0; margin: 0 0 10px; text-transform: uppercase; }
.footer-meta p { margin: 0; font-size: 14px; line-height: 1.9; }
.footer-meta a:hover { color: #fff5ec; text-decoration: underline; }
.footer-copy { border-top: 1px solid rgba(255,245,236,.12); padding: 20px 0; }
.footer-copy small { font-size: 12.5px; opacity: .6; letter-spacing: .04em; }

/* ===== Reveal animation ===== */
.section-head, .about-grid, .timetable, .speakers-grid, .sponsors-coming, .access-grid {
  opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease;
}
.is-visible { opacity: 1 !important; transform: none !important; }

/* ===== Responsive ===== */
@media (max-width: 860px) {
  .about-grid, .access-grid, .footer-inner { grid-template-columns: 1fr; }
  .hero-facts { grid-template-columns: 1fr; }
  .hero-bg::before { width: 300px; height: 300px; top: -60px; right: -80px; }
}
@media (max-width: 720px) {
  .nav {
    position: fixed; inset: var(--head-h) 0 auto 0; flex-direction: column; gap: 0;
    background: rgba(43,26,18,.98); padding: 12px 0 24px; align-items: stretch;
    transform: translateY(-120%); transition: transform .3s ease; backdrop-filter: blur(12px);
  }
  .nav.open { transform: translateY(0); }
  .nav a { padding: 14px 24px; font-size: 16px; }
  .nav a:not(.nav-cta)::after { display: none; }
  .nav-cta { margin: 12px 24px 0; text-align: center; }
  .nav-toggle { display: flex; }
  .footer-meta { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .section { padding: 64px 0; }
  .tt-row { grid-template-columns: 84px 1fr; gap: 14px; }
  .tt-badge { font-size: 12px; padding: 3px 9px; margin-right: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .section-head, .about-grid, .timetable, .speakers-grid, .sponsors-coming, .access-grid { opacity: 1; transform: none; transition: none; }
}