/* ── Base ─────────────────────────────────────────────────────────────── */
body{margin:0;font-family:ui-serif,Georgia,serif;background:#faf9f7;color:#1a1a1a}

/* ── Topbar ───────────────────────────────────────────────────────────── */
.topbar{position:sticky;top:0;background:rgba(250,249,247,.92);backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid #eee6dd;padding:10px 20px;z-index:20;display:flex;align-items:center;gap:18px}
.brand{text-decoration:none;color:#111;font-weight:700;font-size:17px;letter-spacing:.04em;flex-shrink:0;display:flex;align-items:center}
.brand-logo{height:24px;width:auto;display:block}
.topnav{margin-left:auto;display:flex;gap:22px}
.topnav-link{text-decoration:none;color:#555;font-weight:600;font-size:15px;letter-spacing:.02em}
.topnav-link:hover{color:#111}
.hero-logo{height:clamp(84px,12vw,150px);width:auto;display:block;margin-inline:auto}
.tagline{margin:0;font-size:14px;color:#666;font-family:ui-sans-serif,system-ui,sans-serif}

/* ── Home layout ──────────────────────────────────────────────────────── */
.home{max-width:860px;margin:0 auto;padding:0 24px 80px}

/* ── Hero ─────────────────────────────────────────────────────────────── */
.hero{padding:64px 0 44px;text-align:center}
.hero h1{margin:0 0 26px}
.section-head{text-align:center;font-size:22px;font-weight:700;letter-spacing:-.01em;margin:0 0 20px;color:#1a1a1a}
.demo-video{margin:8px 0 48px;text-align:center}
.demo-video video{width:100%;max-width:640px;aspect-ratio:5/4;object-fit:cover;height:auto;display:block;margin:0 auto;border-radius:0;border:1px solid #e6ddcf;box-shadow:0 14px 44px rgba(0,0,0,.16);background:#111}
.carousel{position:relative}
.carousel-track{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;scroll-behavior:smooth;-webkit-overflow-scrolling:touch;scrollbar-width:none}
.carousel-track::-webkit-scrollbar{display:none}
.carousel-track > .excerpt{flex:0 0 100%;box-sizing:border-box;scroll-snap-align:start;margin:0}
.carousel-track .excerpt-text{max-height:340px;overflow:hidden;-webkit-mask-image:linear-gradient(#000 82%,transparent);mask-image:linear-gradient(#000 82%,transparent)}
.carousel-arrow{position:absolute;top:50%;transform:translateY(-50%);z-index:5;width:40px;height:40px;border-radius:50%;border:1px solid #e7e2db;background:rgba(255,255,255,.92);backdrop-filter:blur(4px);color:#333;font-size:22px;line-height:1;cursor:pointer;box-shadow:0 4px 14px rgba(0,0,0,.10);display:flex;align-items:center;justify-content:center;padding:0 0 3px;transition:background .15s,transform .15s,opacity .15s}
.carousel-arrow:hover{background:#fff;transform:translateY(-50%) scale(1.06)}
.carousel-arrow:disabled{opacity:.3;cursor:default;transform:translateY(-50%)}
.carousel-arrow.prev{left:-10px}
.carousel-arrow.next{right:-10px}
.carousel-chips{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:18px}
.chip{font:inherit;font-size:13px;font-weight:600;color:#666;padding:7px 14px;border-radius:999px;border:1px solid #e2dccf;background:#faf7f1;cursor:pointer;transition:color .15s,background .15s,border-color .15s}
.chip:hover{color:#222;border-color:#d3c9b6}
.chip.active{color:#fff;background:#1a1a1a;border-color:#1a1a1a}
h1{font-size:44px;margin:0 0 12px;line-height:1.1}
.sub{margin:0 auto;font-size:18px;color:#555;max-width:560px;line-height:1.6}

/* ── Excerpt blocks ───────────────────────────────────────────────────── */
.excerpts{display:flex;flex-direction:column;gap:28px;margin-bottom:64px}

.excerpt{background:white;border:1px solid #e7e2db;border-radius:16px;padding:28px 32px 22px;position:relative;transition:box-shadow .2s}
.excerpt:hover{box-shadow:0 12px 40px rgba(0,0,0,.07)}

.excerpt-meta{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 10px;margin-bottom:16px}
.excerpt-book{font-weight:700;font-size:17px}
.excerpt-author{color:#555;font-size:15px}
.excerpt-chapter{font-size:13px;color:#888;font-family:ui-sans-serif,system-ui,sans-serif;margin-left:auto}

.excerpt-text{margin:0 0 18px;font-size:16px;line-height:1.75;color:#1a1a1a}

.excerpt-link{font-size:14px;color:#666;text-decoration:none;font-family:ui-sans-serif,system-ui,sans-serif;border-bottom:1px solid #ddd;padding-bottom:1px;transition:color .15s,border-color .15s}
.excerpt-link:hover{color:#111;border-color:#999}

/* ── Inline highlights (color set inline per annotation) ──────────────── */
mark.sh{display:inline;color:inherit;cursor:pointer;border-radius:3px;padding:1px 3px;position:relative;transition:filter .15s}
mark.sh:hover{filter:brightness(.86)}

/* ── More section ─────────────────────────────────────────────────────── */
.more-section{padding-top:0}
.more-heading{font-size:22px;font-weight:600;margin:0 0 16px;color:#333}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px}
.card{display:block;padding:16px 18px;border:1px solid #e7e2db;border-radius:12px;background:white;text-decoration:none;color:inherit;transition:border-color .2s,box-shadow .2s}
.card:hover{border-color:#d9d0c6;box-shadow:0 8px 24px rgba(0,0,0,.06)}
.card h3{margin:0 0 4px;font-size:16px;font-weight:700}
.card p{margin:0;color:#666;font-size:13px;font-family:ui-sans-serif,system-ui,sans-serif}

/* ── Chapter reader ───────────────────────────────────────────────────── */
.chapter{max-width:820px;margin:44px auto;padding:0 22px;font-size:20px;line-height:1.7;position:relative}
.chapter h2,.chapter h3{text-align:center;margin:52px 0 24px}
.chapter p{margin:0 0 14px}
.summa-highlight{color:inherit;text-decoration:none;position:relative;z-index:2}
.summa-overlay-layer{position:absolute;inset:0;pointer-events:none;z-index:1}
.summa-overlay-box{position:absolute;border-radius:0;box-sizing:border-box;border:2px solid transparent;box-shadow:none}

/* ── Post (blog / about) ──────────────────────────────────────────────── */
.post{padding:8px 0 40px}
.post .back-link{font-size:14px;color:#888;text-decoration:none;font-family:ui-sans-serif,system-ui,sans-serif}
.post .back-link:hover{color:#444}
.post h2{font-size:24px;margin:40px 0 14px;line-height:1.25}
.post h2:first-of-type{margin-top:32px}
.post p{font-size:17px;line-height:1.75;margin:0 0 18px;max-width:640px}
.post .lede{font-size:19px;color:#444;max-width:640px}

/* ── Footer ───────────────────────────────────────────────────────────── */
.site-footer{text-align:center;padding:28px 0 36px;font-size:13px;color:#999;font-family:ui-sans-serif,system-ui,sans-serif}
.site-footer a{color:#999;text-decoration:none;border-bottom:1px solid #ddd}
.site-footer a:hover{color:#444;border-color:#999}
.footer-copy{display:block;margin-top:8px;color:#aaa;border:0}
.form-section{margin:34px auto;max-width:460px}
.form-section h2{margin:0 0 6px}
.form-note{font-size:14px;color:#666;margin:0 0 18px;line-height:1.55}
.form{display:flex;flex-direction:column;gap:14px;text-align:left}
.form label{display:flex;flex-direction:column;gap:6px;font-size:13px;font-weight:600;color:#444;letter-spacing:.01em}
.form input,.form textarea{font:inherit;font-weight:400;font-size:15px;padding:10px 12px;border:1px solid #ddd4c6;border-radius:8px;background:#fff;color:#111}
.form textarea{min-height:120px;resize:vertical}
.form input:focus,.form textarea:focus{outline:none;border-color:#b21320;box-shadow:0 0 0 3px rgba(178,19,32,.12)}
.form button{align-self:flex-start;background:#1a1a1a;color:#fff;border:0;font-weight:600;font-size:15px;padding:11px 24px;border-radius:8px;cursor:pointer}
.form button:hover{background:#000}
.form .hp{position:absolute;left:-9999px}

/* ── Tooltip ──────────────────────────────────────────────────────────── */
.summa-tooltip{position:fixed;max-width:380px;background:white;border:1px solid #eee6dd;border-radius:12px;padding:14px 14px 12px;box-shadow:0 18px 50px rgba(0,0,0,.18);z-index:9999}
.summa-tooltip .hw{font-weight:700;font-size:18px}
.summa-tooltip .pos{color:#666;font-size:13px;margin-top:2px;text-transform:capitalize}
.summa-tooltip .def{margin-top:10px}
.summa-tooltip .meta{margin-top:8px;color:#666;font-size:12px;line-height:1.4;word-break:break-word}
.summa-tooltip .meta a{color:#555;text-decoration:underline;text-underline-offset:2px}
.summa-tooltip .meta a:hover{color:#111}