/* Sofniko: modern industrial, dark. Products on a workbench grid; orange for actions, cyan for hairlines, numbers and icons. */
:root {
  --bg: #0b0d10;
  --section: #131720;
  --text: #f4f6f8;
  --muted: #9ba6b4;
  --orange: #ff5a1f;
  --cyan: #22d3ee;
  --border: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.12);

  --display: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
  --body: "Inter", "Segoe UI", system-ui, sans-serif;

  --r-card: 12px;
  --r-btn: 8px;
  --wrap: 72rem;
  --ease: cubic-bezier(.2, .7, .2, 1);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; border-radius: var(--r-btn); }
::selection { background: var(--orange); color: var(--bg); }

.wrap { max-width: var(--wrap); margin-inline: auto; padding-inline: clamp(1rem, 4vw, 2rem); }

/* Header */
.site-header { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 10; background: rgba(11, 13, 16, 0.85); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 4rem; }
.logo { font-family: var(--display); font-weight: 700; font-size: 1.25rem; letter-spacing: -0.04em; text-decoration: none; display: inline-flex; align-items: center; gap: 0.6rem; }
.logo-mark { width: 1.75rem; height: 1.75rem; border-radius: 6px; background: var(--orange); color: var(--bg); display: grid; place-items: center; font-size: 1rem; letter-spacing: 0; }
.nav { display: flex; gap: 0.25rem; }
.nav a { text-decoration: none; font-weight: 500; font-size: 0.95rem; padding: 0.55rem 0.9rem; min-height: 44px; display: inline-flex; align-items: center; border-radius: var(--r-btn); color: var(--muted); transition: color .2s, background-color .2s; }
.nav a:hover { color: var(--text); background: var(--section); }
.nav a[aria-current="page"] { color: var(--text); box-shadow: inset 0 -2px 0 var(--orange); border-radius: 0; }

/* Type */
h1, h2, h3 { font-family: var(--display); font-weight: 700; letter-spacing: -0.04em; line-height: 1.02; margin: 0; text-wrap: balance; }
h1 { font-size: clamp(2.5rem, 8.5vw, 5.75rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h3 { font-size: 1.4rem; letter-spacing: -0.03em; line-height: 1.15; }
p { margin: 0; max-width: 62ch; }
.lede { font-size: clamp(1.05rem, 2vw, 1.25rem); color: var(--muted); }
.label { display: inline-flex; align-items: center; gap: 0.6rem; font-family: var(--display); font-size: 0.8rem; font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); }
.label::before { content: ""; width: 1.5rem; height: 1px; background: var(--cyan); }
.accent { color: var(--orange); }

/* Hero with subtle grid texture */
.hero { position: relative; isolation: isolate; border-bottom: 1px solid var(--border); }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1; opacity: 0.04; pointer-events: none;
  background-image: linear-gradient(var(--text) 1px, transparent 1px), linear-gradient(90deg, var(--text) 1px, transparent 1px);
  background-size: 48px 48px;
}
.hero .wrap { padding-block: clamp(4rem, 12vw, 8rem) clamp(3rem, 8vw, 5rem); display: grid; gap: 1.5rem; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 0.5rem 2rem; padding-top: 1rem; }
.hero-meta div { display: grid; }
.hero-meta strong { font-family: var(--display); font-size: 1.75rem; color: var(--cyan); letter-spacing: -0.03em; line-height: 1.2; font-variant-numeric: tabular-nums; }
.hero-meta span { color: var(--muted); font-size: 0.85rem; }

/* Sections */
.section { padding-block: clamp(3rem, 8vw, 5.5rem); display: grid; gap: 2rem; }
.band { background: var(--section); border-block: 1px solid var(--border); }
.section-head { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 0.75rem 2rem; }
.section-head > div { display: grid; gap: 0.75rem; }
.link { display: inline-flex; align-items: center; gap: 0.4rem; font-weight: 600; text-decoration: none; color: var(--text); min-height: 44px; }
.link svg { color: var(--cyan); transition: transform .3s var(--ease); }
.link:hover svg { transform: translateX(4px); }

/* Product shelf: 3D books. To add a product, copy one .item block in the HTML. */
.shelf { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 15rem), 1fr)); gap: clamp(1.5rem, 4vw, 3rem) clamp(1rem, 3vw, 2.5rem); }
.item { display: grid; align-content: start; gap: 1.1rem; text-decoration: none; min-width: 0; }
.item-body { display: grid; gap: 0.4rem; min-width: 0; }
.item-body h3 { font-size: 1.2rem; }
.item-body p { color: var(--muted); font-size: 0.92rem; line-height: 1.6; }
.item .more { display: inline-flex; align-items: center; gap: 0.35rem; font-weight: 600; font-size: 0.92rem; color: var(--text); padding-top: 0.2rem; }
.item .more svg { color: var(--cyan); transition: transform .3s var(--ease); }
.item:hover .more svg { transform: translateX(4px); }

.stage { perspective: 1400px; display: grid; place-items: center; aspect-ratio: 4 / 5; overflow: hidden; min-width: 0; padding: 1.25rem 1.5rem 1.75rem; border: 1px solid var(--border); border-radius: var(--r-card); background: var(--section); transition: border-color .35s var(--ease), transform .35s var(--ease); position: relative; }
.stage::after { content: ""; position: absolute; left: 18%; right: 18%; bottom: 0.9rem; height: 14px; border-radius: 50%; background: rgba(0, 0, 0, 0.55); filter: blur(10px); z-index: 0; }
.item:hover .stage { border-color: var(--orange); transform: translateY(-4px); }
.band .stage { background: var(--bg); }

.book { --t: 26px; position: relative; z-index: 1; width: min(68%, 13rem); margin-inline: auto; aspect-ratio: 3 / 4; transform-style: preserve-3d; transform: rotateY(-26deg) rotateX(4deg); transition: transform .6s var(--ease); }
.item:hover .book, .book.flat { transform: rotateY(-8deg) rotateX(2deg); }
.book > * { position: absolute; top: 0; bottom: 0; }
.book .front { left: 0; right: 0; transform: translateZ(calc(var(--t) / 2)); border-radius: 2px 8px 8px 2px; overflow: hidden; background: var(--section); border: 1px solid var(--border-strong); box-shadow: inset 4px 0 0 rgba(255, 255, 255, 0.06); container-type: inline-size; }
.book .back { left: 0; right: 0; transform: translateZ(calc(var(--t) / -2)); border-radius: 2px 8px 8px 2px; background: #07090c; }
.book .spine { left: calc(var(--t) / -2); width: var(--t); transform: rotateY(-90deg); background: #1b2030; border-block: 1px solid var(--border-strong); }
.book .spine::after { content: ""; position: absolute; left: 50%; top: 12%; bottom: 12%; width: 1px; background: var(--orange); opacity: 0.7; }
.book .pages { right: calc(var(--t) / -2 + 2px); width: calc(var(--t) - 4px); top: 3px; bottom: 3px; transform: rotateY(90deg); background: repeating-linear-gradient(90deg, #d9dde3 0 1px, #b9bfc8 1px 2px); }
.book.app .pages { background: #1b2030; }
.book .front img { width: 100%; height: 100%; object-fit: cover; }

/* Cover artwork (placeholder until real cover images arrive) */
.art { position: absolute; inset: 0; display: flex; flex-direction: column; justify-content: space-between; padding: 9% 9% 8%; color: var(--text); }
.art svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.art > :not(svg) { position: relative; }
.art .tag { font-family: var(--display); font-weight: 500; font-size: 4.6cqw; letter-spacing: 0.14em; text-transform: uppercase; color: var(--cyan); }
.art .ttl { font-family: var(--display); font-weight: 700; letter-spacing: -0.04em; line-height: 1.02; font-size: 12.5cqw; text-wrap: balance; }
.art .ttl em { font-style: normal; color: var(--orange); }
.art .sub { font-size: 5cqw; color: var(--muted); line-height: 1.4; margin-top: 0.4rem; }
.book.lg { width: min(100%, 19rem); --t: 34px; }

/* Featured strip */
.feature { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: clamp(1.5rem, 5vw, 4rem); align-items: center; }
.feature-body { display: grid; gap: 1.25rem; min-width: 0; }
.note { border: 1px solid var(--border); border-left: 2px solid var(--cyan); border-radius: var(--r-btn); padding: 0.9rem 1rem; font-size: 0.875rem; color: var(--muted); background: var(--section); }
.toc { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; counter-reset: c; border-top: 1px solid var(--border); }
.toc li { counter-increment: c; display: grid; grid-template-columns: 2.5rem 1fr; gap: 0.75rem; padding: 0.7rem 0; border-bottom: 1px solid var(--border); }
.toc li::before { content: counter(c, decimal-leading-zero); font-family: var(--display); font-weight: 700; color: var(--cyan); font-variant-numeric: tabular-nums; }
.toc.p2 { counter-reset: c 12; }
.toc-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr)); gap: 1.5rem 3rem; }
.toc-cols h3 { margin-bottom: 0.75rem; font-size: 1.1rem; }
.chip { justify-self: start; display: inline-flex; align-items: center; gap: 0.45rem; font-size: 0.72rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; padding: 0.25rem 0.6rem; border-radius: 6px; border: 1px solid var(--border-strong); color: var(--muted); }
.chip::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--muted); }
.chip.live { color: var(--text); }
.chip.live::before { background: var(--cyan); box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.18); }

/* Detail pages */
.detail { display: grid; grid-template-columns: minmax(0, 20rem) minmax(0, 1fr); gap: clamp(2rem, 6vw, 4.5rem); align-items: start; padding-block: clamp(3rem, 8vw, 5.5rem); }
.detail-body { display: grid; gap: 1.5rem; min-width: 0; }
.detail h1 { font-size: clamp(2.2rem, 6vw, 4rem); }
.facts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin: 0; border: 1px solid var(--border); border-radius: var(--r-card); background: var(--section); }
.facts div { display: grid; gap: 0.15rem; padding: 0.9rem 1rem; border-left: 1px solid var(--border); min-width: 0; }
.facts div:first-child { border-left: 0; }
.facts dt { font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.facts dd { margin: 0; font-family: var(--display); font-weight: 700; font-size: 1.1rem; color: var(--cyan); font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.buy { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.6rem; min-height: 48px; background: var(--orange); color: var(--bg); text-decoration: none; font-weight: 600; padding: 0.8rem 1.5rem; border-radius: var(--r-btn); border: 1px solid var(--orange); font-size: 1rem; transition: transform .25s var(--ease), background-color .25s, color .25s; }
.btn:hover { transform: translateY(-2px); }
.btn.ghost { background: transparent; color: var(--text); border-color: var(--border-strong); }
.btn.ghost:hover { border-color: var(--orange); }
.small { font-size: 0.875rem; color: var(--muted); }
.list { margin: 0; padding: 0; list-style: none; display: grid; gap: 0.6rem; }
.list li { display: flex; gap: 0.75rem; align-items: baseline; }
.list li::before { content: ""; flex: none; width: 0.9rem; height: 1px; background: var(--cyan); transform: translateY(-0.3em); }

/* Steps: a real sequence */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr)); gap: 1.25rem; counter-reset: s; list-style: none; margin: 0; padding: 0; }
.steps li { counter-increment: s; background: var(--bg); border: 1px solid var(--border); border-radius: var(--r-card); padding: 1.25rem; display: grid; gap: 0.4rem; transition: transform .35s var(--ease), border-color .35s var(--ease); }
.steps li:hover { transform: translateY(-4px); border-color: var(--orange); }
.steps li::before { content: counter(s, decimal-leading-zero); font-family: var(--display); font-weight: 700; font-size: 0.85rem; color: var(--cyan); letter-spacing: 0.08em; padding-bottom: 0.6rem; border-bottom: 1px solid var(--border); margin-bottom: 0.4rem; }
.steps strong { font-family: var(--display); font-size: 1.15rem; letter-spacing: -0.03em; }
.steps span { color: var(--muted); font-size: 0.95rem; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; padding-block: 2rem; color: var(--muted); font-size: 0.875rem; }
.site-footer a { color: var(--text); text-decoration-color: var(--cyan); text-underline-offset: 3px; }

/* Scroll reveal: fade + slide up 30px, 500ms, 80ms stagger (set by reveal.js). Without JS everything stays visible. */
.js .reveal { opacity: 0; transform: translateY(30px); transition: opacity 500ms var(--ease), transform 500ms var(--ease); transition-delay: var(--d, 0ms); }
.js .reveal.in { opacity: 1; transform: none; }
.js .steps li.reveal.in:hover { transform: translateY(-4px); transition-delay: 0ms; }

/* Phones */
@media (max-width: 40rem) {
  .shelf { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stage { padding: 0.75rem; }
  .book { width: 78%; }
  .book { --t: 18px; }
  .feature { grid-template-columns: 1fr; }
  .detail .book.lg, .feature .book.lg { width: min(100%, 14rem); }
  .detail { grid-template-columns: 1fr; }
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .facts div:nth-child(3) { border-left: 0; }
  .facts div:nth-child(n+3) { border-top: 1px solid var(--border); }
  .buy .btn { width: 100%; }
  .nav a { padding-inline: 0.65rem; }
}
@media (prefers-reduced-motion: reduce) {
  .book { transform: rotateY(-20deg); }
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
}

/* Phone mockup (same 3D logic as .book) */
.phone { --t: 12px; position: relative; z-index: 1; width: min(44%, 9rem); margin-inline: auto; aspect-ratio: 1 / 2; transform-style: preserve-3d; transform: rotateY(-26deg) rotateX(4deg); transition: transform .6s var(--ease); }
.item:hover .phone, .phone.flat { transform: rotateY(-8deg) rotateX(2deg); }
.phone > * { position: absolute; top: 0; bottom: 0; }
.phone .front { left: 0; right: 0; transform: translateZ(calc(var(--t) / 2)); border-radius: 22px; background: #1b2030; padding: 6px; border: 1px solid var(--border-strong); }
.phone .screen { position: relative; width: 100%; height: 100%; border-radius: 17px; overflow: hidden; }
.phone .screen svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.phone .back { left: 0; right: 0; transform: translateZ(calc(var(--t) / -2)); border-radius: 22px; background: #07090c; }
.phone .spine { left: calc(var(--t) / -2); width: var(--t); top: 18px; bottom: 18px; transform: rotateY(-90deg); background: #262c3d; }
.phone .pages { right: calc(var(--t) / -2); width: var(--t); top: 18px; bottom: 18px; transform: rotateY(90deg); background: #2e3548; }
.phone.lg { width: min(70%, 14rem); --t: 16px; }
.phone.lg .front { border-radius: 30px; padding: 8px; }
.phone.lg .screen { border-radius: 23px; }

/* Category cards: two wide cards */
.shelf.cats { grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr)); }
.cats .stage { aspect-ratio: 16 / 11; }
.cats .book { width: min(42%, 14rem); }
.cats .phone { width: min(30%, 10rem); }

/* Offer list */
.offer { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr)); gap: 1.25rem; }
.offer li { display: grid; grid-template-columns: auto 1fr; grid-template-rows: auto auto; gap: 0.9rem 1rem; align-content: start; background: var(--bg); border: 1px solid var(--border); border-radius: var(--r-card); padding: 1.25rem; transition: transform .35s var(--ease), border-color .35s var(--ease); }
.offer li:hover { transform: translateY(-4px); border-color: var(--orange); }
.offer .ico { width: 2.75rem; height: 2.75rem; border-radius: var(--r-btn); border: 1px solid var(--border-strong); display: grid; place-items: center; color: var(--cyan); }
.offer li > div { min-width: 0; display: grid; gap: 0.3rem; }
.offer h3 { font-size: 1.15rem; }
.offer p { color: var(--muted); font-size: 0.92rem; line-height: 1.6; }
.offer .chip { grid-column: 2; }
.js .offer li.reveal.in:hover { transform: translateY(-4px); transition-delay: 0ms; }

@media (max-width: 40rem) {
  .shelf.cats { grid-template-columns: 1fr; }
  .cats .book { width: min(40%, 10rem); }
  .cats .phone { width: min(28%, 7rem); }
  .phone { --t: 10px; }
  .detail .phone.lg { width: min(60%, 12rem); }
}
@media (prefers-reduced-motion: reduce) { .phone { transform: rotateY(-20deg); } }