/* AIマッハ新書 LP v0.4.0 — 本の紙面と同じ部品感で組む */
@font-face { font-family: "LINE Seed JP"; src: url("assets/fonts/line-seed-jp-regular.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "LINE Seed JP"; src: url("assets/fonts/line-seed-jp-bold.woff2") format("woff2"); font-weight: 700; font-display: swap; }
@font-face { font-family: "LINE Seed JP"; src: url("assets/fonts/line-seed-jp-extrabold.woff2") format("woff2"); font-weight: 900; font-display: swap; }

:root {
  --red: #e0262d; --red-deep: #b3141c; --red-soft: #fde8e4;
  --ink: #15202b; --ink-2: #2b3540; --muted: #5b6570;
  --paper: #f7f2e8; --cream: #fffaf0; --mark: #ffd23f; --blue: #1f6fd1; --rule: #d9d4ca;
  --font: "LINE Seed JP", "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  --wrap: min(1160px, calc(100% - 32px));
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); color: var(--ink); background: var(--cream); line-height: 1.85; font-size: 16px; overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
h1, h2, h3 { font-weight: 900; line-height: 1.25; margin: 0; font-feature-settings: "palt"; letter-spacing: -0.01em; }
h2 { font-size: clamp(2rem, 5.2vw, 3.6rem); }
p { margin: 0 0 1em; }
b, strong { font-weight: 700; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: #fff; padding: 8px 14px; z-index: 100; }
.skip:focus { left: 8px; }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }
.center { text-align: center; }
.fine { font-size: .8rem; color: var(--muted); line-height: 1.7; }
.fine.light, .fine.light a { color: rgba(255,250,240,.82); }
.progress { position: fixed; inset: 0 0 auto; height: 4px; background: var(--mark); transform-origin: left; transform: scaleX(0); z-index: 60; }

/* ---------- header ---------- */
.site-head { position: sticky; top: 0; z-index: 50; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 10px max(16px, calc((100% - 1160px) / 2)); background: rgba(255,250,240,.92); backdrop-filter: blur(10px); border-bottom: 3px solid var(--ink); }
.brand img { height: 40px; width: auto; }
.site-head nav { display: flex; align-items: center; gap: 22px; font-weight: 700; font-size: .9rem; }
.site-head nav a { text-decoration: none; }
.site-head nav a:hover { color: var(--red); }
.nav-cta { background: var(--red); color: #fff !important; padding: 8px 16px; border-radius: 999px; box-shadow: 3px 3px 0 var(--ink); }
.nav-cta:hover { transform: translate(-1px,-1px); box-shadow: 4px 4px 0 var(--ink); }

/* ---------- buttons ---------- */
.btn { position: relative; display: inline-flex; align-items: center; justify-content: center; text-decoration: none; font-weight: 900; border-radius: 14px; padding: 16px 26px; border: 3px solid var(--ink); box-shadow: 6px 6px 0 var(--ink); transition: transform .15s, box-shadow .15s; overflow: visible; }
.btn:hover { transform: translate(-2px,-2px); box-shadow: 8px 8px 0 var(--ink); }
.btn:active { transform: translate(3px,3px); box-shadow: 2px 2px 0 var(--ink); }
.btn > span:first-child { position: relative; z-index: 2; display: flex; flex-direction: column; line-height: 1.35; text-align: left; }
.btn small { font-size: .68rem; letter-spacing: .16em; color: var(--red); }
.btn-light { background: var(--cream); color: var(--ink); font-size: 1.1rem; }
.btn-ink { background: var(--ink); color: #fff; border-color: var(--ink); box-shadow: 6px 6px 0 var(--red); }
.btn.big { font-size: clamp(1.1rem, 2.6vw, 1.5rem); padding: 22px 34px; }
.btn-link { font-weight: 900; text-decoration: none; border-bottom: 3px solid currentColor; padding-bottom: 2px; }
.flame-bed { position: absolute; left: 0; right: 0; bottom: 40%; height: 0; z-index: 1; pointer-events: none; }
.flame-particle { position: absolute; bottom: 0; width: 26px; height: 46px; border-radius: 50% 50% 45% 45% / 62% 62% 38% 38%; background: radial-gradient(ellipse at 50% 80%, #fff6b0 0 18%, var(--mark) 30%, #ff8a1e 55%, var(--red) 78%, transparent 80%); transform-origin: 50% 100%; filter: blur(.3px); }

/* ---------- hero ---------- */
.hero { position: relative; display: grid; grid-template-columns: 1.1fr .9fr; gap: 32px; align-items: center; padding: 64px max(16px, calc((100% - 1160px) / 2)) 96px; background: var(--red); color: var(--cream); overflow: hidden; isolation: isolate; }
.hero::before { content: ""; position: absolute; inset: 0; z-index: -1; background: repeating-linear-gradient(-60deg, rgba(255,255,255,.07) 0 14px, transparent 14px 44px); }
.hero-lines { position: absolute; inset: 0; z-index: -1; pointer-events: none; }
.hero-lines i { position: absolute; left: 100%; height: 6px; width: 40%; background: linear-gradient(90deg, transparent, rgba(255,250,240,.55)); border-radius: 3px; }
.hero-lines i:nth-child(1) { top: 18%; } .hero-lines i:nth-child(2) { top: 34%; width: 25%; } .hero-lines i:nth-child(3) { top: 57%; } .hero-lines i:nth-child(4) { top: 72%; width: 30%; } .hero-lines i:nth-child(5) { top: 86%; width: 20%; }
.kicker { display: inline-block; font-weight: 900; font-size: 1.05rem; letter-spacing: .12em; background: var(--ink); color: var(--cream); padding: 4px 14px; transform: skewX(-8deg); margin-bottom: 12px; }
.hero-title { font-size: clamp(3.6rem, 11vw, 8.4rem); line-height: .98; letter-spacing: -.04em; text-shadow: 6px 6px 0 var(--ink); }
.hero-title span { display: block; }
.hero-title span + span { color: var(--mark); }
.hero-catch { font-size: clamp(1.3rem, 3vw, 2rem); font-weight: 900; line-height: 1.45; margin: 22px 0 14px; }
.hero-lead { font-size: 1.05rem; max-width: 34em; }
.hero-lead b { background: linear-gradient(transparent 60%, rgba(255,210,63,.55) 60%); }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 22px 28px; margin: 28px 0 22px; }
.hero-actions .btn-link { color: var(--cream); }
.hero-badges { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0; }
.hero-badges li { font-size: .8rem; font-weight: 700; border: 2px solid rgba(255,250,240,.7); border-radius: 999px; padding: 3px 12px; }
.hero-book { position: relative; margin: 0; justify-self: center; width: min(430px, 100%); perspective: 900px; }
.hero-book img { border: 4px solid var(--ink); box-shadow: 16px 16px 0 var(--ink); transform: rotate(3deg); border-radius: 4px; }
.sticker { position: absolute; left: -26px; top: 34px; background: var(--mark); color: var(--ink); font-weight: 900; font-size: .9rem; line-height: 1.4; padding: 12px 16px; border: 3px solid var(--ink); border-radius: 12px; transform: rotate(-7deg); box-shadow: 4px 4px 0 var(--ink); }
.sticker b { display: block; font-size: 1.1rem; }
.hazard { position: absolute; left: 0; right: 0; bottom: 0; height: 18px; background: repeating-linear-gradient(-60deg, var(--ink) 0 14px, var(--cream) 14px 24px); }

.ticker { overflow: hidden; background: var(--ink); color: var(--mark); font-weight: 900; letter-spacing: .06em; white-space: nowrap; padding: 12px 0; font-size: 1rem; }
.ticker-track { display: inline-flex; }
.ticker-track span { padding-right: 24px; }

/* ---------- sections ---------- */
.section { width: var(--wrap); margin: 0 auto; padding: 96px 0; }
.section-head { max-width: 760px; margin-bottom: 44px; }
.section-lead { font-size: 1.08rem; margin-top: 18px; color: var(--ink-2); }
.eyebrow { display: flex; align-items: center; gap: 12px; font-weight: 900; font-size: .9rem; letter-spacing: .08em; color: var(--red); margin-bottom: 14px; }
.eyebrow span { background: var(--red); color: #fff; font-size: .8rem; padding: 2px 9px; border-radius: 6px; letter-spacing: .02em; }
.eyebrow.light { color: var(--mark); }
.eyebrow.light span { background: var(--mark); color: var(--ink); }
.prose { font-size: 1.02rem; }
.prose .big, .big { font-size: clamp(1.35rem, 2.6vw, 1.8rem); font-weight: 900; line-height: 1.45; margin: 1.2em 0; }
h2 em { font-style: normal; color: var(--red); }

/* flow */
.steps { list-style: none; padding: 0; margin: 0 0 40px; display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; counter-reset: s; }
.steps li { position: relative; background: #fff; border: 3px solid var(--ink); border-radius: 16px; padding: 18px 16px 16px; box-shadow: 5px 5px 0 var(--ink); }
.steps li + li::before { content: ""; position: absolute; left: -15px; top: 42px; border-left: 12px solid var(--red); border-top: 9px solid transparent; border-bottom: 9px solid transparent; }
.steps b { display: block; font-size: 2.2rem; line-height: 1; color: var(--red); letter-spacing: -.05em; margin-bottom: 6px; }
.steps h3 { font-size: 1.3rem; margin-bottom: 6px; }
.steps p { font-size: .88rem; margin: 0; line-height: 1.65; color: var(--ink-2); }
.prompt { position: relative; background: var(--ink); color: var(--cream); border-radius: 18px; padding: 26px 28px; border-top: 6px solid var(--red); max-width: 880px; }
.prompt-label { font-weight: 900; color: var(--mark); display: flex; justify-content: space-between; font-size: .95rem; margin-bottom: 10px; }
.prompt-label span { background: var(--mark); color: var(--ink); font-size: .7rem; padding: 2px 8px; border-radius: 4px; letter-spacing: .12em; }
.prompt #start-prompt { font-size: 1.02rem; line-height: 1.8; }
.prompt button { font: inherit; font-weight: 900; background: var(--red); color: #fff; border: 0; border-radius: 999px; padding: 10px 22px; cursor: pointer; }
.prompt button:hover { background: var(--red-deep); }
#copy-status { margin-left: 14px; font-size: .88rem; color: var(--mark); }
.flow .fine { margin-top: 18px; }

/* story */
.story { background: var(--ink); color: var(--cream); }
.story-art { margin: 0; max-height: 520px; overflow: hidden; border-bottom: 6px solid var(--red); }
.story-art img { width: 100%; height: 100%; object-fit: cover; }
.story-body { padding-top: 72px; }
.story-cols { display: grid; grid-template-columns: 1.2fr 1fr; gap: 56px; margin-top: 36px; align-items: start; }
.story .prose b { color: var(--mark); }
.story .big { color: var(--mark); }
.versus { display: grid; gap: 14px; }
.versus > div { border-radius: 16px; padding: 22px 24px; background: rgba(255,250,240,.08); border: 2px solid rgba(255,250,240,.25); }
.versus .vs-new { background: var(--red); border-color: var(--red); box-shadow: 6px 6px 0 var(--mark); }
.vs-label { font-weight: 900; font-size: 1.25rem; margin-bottom: 6px; }
.versus p:last-child { margin: 0; }
.vs-arrow { font-size: 2rem; font-weight: 900; color: var(--mark); justify-self: center; transform: rotate(90deg); line-height: 1; }

/* readless */
.readless-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.readless-art { margin: 0; }
.readless-art img { border: 3px solid var(--ink); border-radius: 18px; box-shadow: 10px 10px 0 var(--red); }
.mini-steps { list-style: none; padding: 0; margin: 48px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.mini-steps li { display: flex; align-items: center; gap: 14px; font-weight: 900; font-size: 1.1rem; background: var(--paper); border-radius: 14px; padding: 16px 18px; border-top: 5px solid var(--red); }
.mini-steps b { display: grid; place-items: center; width: 42px; height: 42px; flex: 0 0 42px; border-radius: 50%; background: var(--red); color: #fff; font-size: 1.2rem; }

/* preview */
.preview { text-align: left; }
.reader { background: var(--paper); border-radius: 24px; padding: 34px 20px 24px; border: 3px solid var(--ink); box-shadow: 10px 10px 0 var(--ink); }
.reader-stage { display: flex; align-items: center; justify-content: center; gap: 18px; }
.reader-stage a { display: block; width: min(460px, 100%); }
.reader-stage img { width: 100%; border-radius: 6px; box-shadow: 0 16px 40px rgba(21,32,43,.28); background: #fff; }
.reader-nav { flex: 0 0 auto; width: 54px; height: 54px; border-radius: 50%; border: 3px solid var(--ink); background: var(--cream); font: 900 1.3rem var(--font); cursor: pointer; box-shadow: 3px 3px 0 var(--ink); }
.reader-nav:disabled { opacity: .3; cursor: default; }
.reader-thumbs { display: flex; justify-content: center; gap: 8px; margin-top: 22px; flex-wrap: wrap; }
.reader-thumbs button { width: 52px; padding: 0; border: 3px solid transparent; border-radius: 6px; background: none; cursor: pointer; opacity: .6; }
.reader-thumbs button[aria-current="true"] { border-color: var(--red); opacity: 1; }
.reader-thumbs img { border-radius: 3px; }
.reader-caption { text-align: center; font-weight: 700; margin: 14px 0 0; font-size: .95rem; }
.preview .center { margin-top: 34px; }

/* template */
.template { background: none; }
.template-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 28px; align-items: stretch; }
.template-shot { margin: 0; background: var(--paper); border-radius: 20px; padding: 18px; border: 3px solid var(--ink); }
.template-shot img { border-radius: 8px; }
.template-code { background: var(--ink); color: var(--cream); border-radius: 20px; padding: 20px 22px; overflow: auto; }
.code-label { font-size: .75rem; color: var(--mark); letter-spacing: .08em; font-weight: 700; margin-bottom: 10px; }
.template-code pre { margin: 0; font: .82rem/1.75 "BIZ UDGothic", ui-monospace, Consolas, monospace; white-space: pre-wrap; }
.c-h { color: #ff8a8e; font-weight: 700; } .c-d { color: var(--mark); } .c-s { color: #8fd3ff; }
.parts { list-style: none; padding: 0; margin: 28px 0 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.parts li { background: #fff; border-top: 5px solid var(--red); border-radius: 0 0 12px 12px; padding: 14px 16px; font-size: .88rem; line-height: 1.6; box-shadow: 0 1px 0 var(--rule); }
.parts b { display: block; font-size: 1.05rem; margin-bottom: 2px; }

/* contents */
.contents { border-top: 3px solid var(--ink); }
.chapters { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.chapters li { position: relative; background: #fff; border: 3px solid var(--ink); border-radius: 16px; overflow: hidden; }
.chapters img { aspect-ratio: 16 / 10; width: 100%; object-fit: cover; border-bottom: 3px solid var(--ink); }
.chapters b { position: absolute; left: 12px; top: 10px; font-size: 2rem; line-height: 1; color: #fff; background: var(--red); padding: 4px 8px 6px; border-radius: 8px; letter-spacing: -.04em; }
.chapters span { display: block; padding: 12px 14px 14px; font-weight: 900; line-height: 1.45; }

/* character */
.character-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: start; }
.say { display: flex; align-items: center; gap: 16px; margin: 28px 0; }
.say img { width: 76px; height: 76px; border-radius: 50%; border: 3px solid var(--red); flex: 0 0 76px; }
.say p { position: relative; margin: 0; background: #fff; border: 3px solid var(--ink); border-radius: 18px; padding: 14px 18px; font-weight: 700; }
.character-sheet { margin-top: 24px; border-radius: 16px; background: #fff; border: 3px solid var(--ink); }
.comic { margin: 0; }
.comic img { border: 3px solid var(--ink); border-radius: 8px; box-shadow: 10px 10px 0 var(--red); transform: rotate(1.5deg); }

/* case */
.case-grid { display: grid; grid-template-columns: 300px 1fr; gap: 48px; align-items: center; background: var(--paper); border-radius: 24px; padding: 36px; }
.case-grid img { border: 3px solid var(--ink); box-shadow: 8px 8px 0 var(--ink); transform: rotate(-3deg); background: #fff; }
.case h2 { font-size: clamp(1.7rem, 4vw, 2.6rem); margin-bottom: 18px; }

/* download */
.download { position: relative; background: var(--red); color: var(--cream); padding: 96px 16px 120px; overflow: hidden; isolation: isolate; }
.download::before { content: ""; position: absolute; inset: 0; z-index: -1; background: repeating-linear-gradient(-60deg, rgba(255,255,255,.07) 0 14px, transparent 14px 44px); }
.download-inner { width: min(900px, 100%); margin: 0 auto; text-align: center; }
.download .eyebrow { justify-content: center; }
.download h2 em { color: var(--mark); font-style: normal; display: block; }
.download .btn { margin: 40px 0 14px; }
.download-note { font-weight: 700; }
.download-list { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; margin: 30px 0 22px; }
.download-list a { text-decoration: none; background: var(--cream); color: var(--ink); border-radius: 14px; padding: 14px 10px; border: 3px solid var(--ink); display: flex; flex-direction: column; gap: 4px; line-height: 1.4; transition: transform .15s; }
.download-list a:hover { transform: translateY(-3px); }
.download-list b { font-size: .98rem; }
.download-list span { font-size: .75rem; color: var(--muted); }

/* share / club */
.share { width: var(--wrap); margin: 0 auto; padding: 88px 0; display: grid; grid-template-columns: 1.2fr 1fr; gap: 44px; align-items: center; }
.share img { border-radius: 16px; border: 3px solid var(--ink); }
.share h2 { margin-bottom: 26px; }
.club { background: var(--ink); color: var(--cream); text-align: center; padding: 80px 16px; }
.club p { color: var(--mark); font-weight: 900; }
.club h2 { margin-bottom: 30px; }
.site-foot { display: flex; flex-wrap: wrap; gap: 12px 28px; justify-content: center; padding: 26px 16px 96px; font-size: .85rem; color: var(--muted); }
.mobile-cta { display: none; }

/* ---------- responsive ---------- */
@media (max-width: 1000px) {
  .steps { grid-template-columns: repeat(2, 1fr); }
  .steps li + li::before { display: none; }
  .parts, .chapters { grid-template-columns: repeat(2, 1fr); }
  .download-list { grid-template-columns: repeat(2, 1fr); }
  .template-grid, .character-grid, .story-cols, .readless-grid, .share { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  body { font-size: 15px; }
  .site-head nav a:not(.nav-cta) { display: none; }
  .brand img { height: 32px; }
  .hero { grid-template-columns: 1fr; padding: 40px 16px 72px; text-align: left; }
  .hero-book { width: min(300px, 82%); margin-top: 8px; }
  .sticker { left: -12px; font-size: .78rem; }
  .section { padding: 68px 0; }
  .steps { grid-template-columns: 1fr; gap: 10px; }
  .steps li { display: grid; grid-template-columns: 44px 1fr; column-gap: 10px; padding: 12px 14px; box-shadow: 4px 4px 0 var(--ink); }
  .steps b { grid-row: span 2; font-size: 1.7rem; margin: 2px 0 0; }
  .steps h3 { font-size: 1.1rem; margin: 0; }
  .reader-thumbs button { width: 30px; }
  .mini-steps { grid-template-columns: 1fr; }
  .case-grid { grid-template-columns: 1fr; padding: 24px; }
  .case-grid img { width: 200px; }
  .download-list { grid-template-columns: 1fr; }
  .reader { padding: 20px 10px; box-shadow: 6px 6px 0 var(--ink); }
  .reader-nav { width: 42px; height: 42px; font-size: 1rem; }
  .reader-stage { gap: 8px; }
  .reader-thumbs button { width: 36px; }
  .mobile-cta { display: block; position: fixed; left: 12px; right: 12px; bottom: 12px; z-index: 40; }
  .mobile-cta a { position: relative; display: block; text-align: center; font-weight: 900; text-decoration: none; background: var(--red); color: #fff; padding: 14px; border-radius: 999px; border: 3px solid var(--ink); box-shadow: 4px 4px 0 var(--ink); }
  .mobile-cta a > span:first-child { position: relative; z-index: 2; }
  .btn { padding: 14px 18px; }
  .btn.big { padding: 18px 20px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn, .download-list a { transition: none; }
}

/* reuse.html */
.legal { width: min(760px, calc(100% - 32px)); margin: 0 auto; padding: 56px 0 96px; }
.legal > a:first-child { font-weight: 900; text-decoration: none; color: var(--red); }
.legal h1 { font-size: clamp(2rem, 6vw, 3.2rem); margin: 28px 0 22px; }
.legal h2 { font-size: 1.3rem; margin: 40px 0 12px; padding-left: 12px; border-left: 6px solid var(--red); }
.legal a { color: var(--red-deep); }