/* ============================================================
   COGWORK — The Game Mechanics Field Guide
   Blueprint / schematic system: deep navy graph paper, cyan line-work,
   amber highlights, monospace annotations. Hand-authored, no framework.
   ============================================================ */

:root {
  --navy-900: #071a2f;
  --navy-800: #0a2540;
  --navy-700: #0e3357;
  --navy-600: #124067;

  --cyan:     #7cd3ff;
  --cyan-dim: #5aa9d6;
  --line:     rgba(124, 211, 255, 0.30);
  --line-soft:rgba(124, 211, 255, 0.13);
  --amber:    #ffb454;

  --ink:   #cfe3f5;
  --white: #eaf4ff;
  --dim:   rgba(207, 227, 245, 0.55);

  --f-head: "Archivo", system-ui, sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --f-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;

  --frame-max: 80rem;
}

* { box-sizing: border-box; }

html {
  background-color: var(--navy-800);
  color: var(--ink);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--f-body);
  font-weight: 300;
  line-height: 1.65;
  color: var(--ink);
  background-color: var(--navy-800);
  /* graph-paper grid: fine + coarse lines */
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px),
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px),
    radial-gradient(1100px 700px at 80% -10%, rgba(124, 211, 255, 0.10), transparent 60%);
  background-size: 120px 120px, 120px 120px, 24px 24px, 24px 24px, 100% 100%;
}

::selection { background: var(--amber); color: var(--navy-900); }

a { color: inherit; text-decoration: none; }
svg { display: block; }

h1, h2, h3, h4 {
  font-family: var(--f-head);
  font-weight: 700;
  line-height: 1.06;
  color: var(--white);
  margin: 0;
  letter-spacing: -0.01em;
}
p { margin: 0; }

.mono { font-family: var(--f-mono); }
.dim { color: var(--dim); }
.mt-1 { margin-top: 0.5rem; } .mt-3 { margin-top: 1.5rem; }

/* -------- Frame (container) -------- */
.frame {
  width: 100%;
  max-width: var(--frame-max);
  margin-inline: auto;
  padding-inline: 1.4rem;
}
@media (min-width: 768px) { .frame { padding-inline: 2.4rem; } }
.frame.narrow { max-width: 52rem; }

/* -------- Typography scale -------- */
.h-xl { font-size: clamp(2.6rem, 6.5vw, 4.6rem); font-weight: 800; }
.h-lg { font-size: clamp(1.9rem, 4vw, 2.9rem); }
.h-md { font-size: clamp(1.5rem, 3vw, 2.1rem); }

.tag {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--cyan);
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--line);
  background: rgba(124, 211, 255, 0.06);
  margin-bottom: 1.3rem;
}
.lead { font-size: 1.08rem; color: var(--ink); max-width: 44rem; }
.mark { color: var(--amber); }
.micro {
  font-family: var(--f-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.16em;
  color: var(--cyan-dim); font-weight: 500; margin-bottom: 0.8rem;
}

/* -------- Buttons -------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  font-family: var(--f-mono);
  font-size: 0.76rem; font-weight: 500; text-transform: uppercase; letter-spacing: 0.14em;
  padding: 0.8rem 1.5rem; border: 1px solid var(--cyan);
  cursor: pointer; transition: background 0.16s ease, color 0.16s ease, box-shadow 0.16s ease;
}
.btn-amber { background: var(--amber); color: var(--navy-900); border-color: var(--amber); }
.btn-amber:hover { box-shadow: 0 0 0 3px rgba(255, 180, 84, 0.2); }
.btn-line { background: transparent; color: var(--cyan); }
.btn-line:hover { background: rgba(124, 211, 255, 0.1); }
.btn-wide { width: 100%; margin-top: 0.4rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-top: 1.8rem; }

.more {
  font-family: var(--f-mono); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--cyan); white-space: nowrap; border-bottom: 1px solid var(--line); padding-bottom: 3px;
}
.more:hover { color: var(--amber); border-color: var(--amber); }

/* -------- Header -------- */
.head {
  position: sticky; top: 0; z-index: 50;
  background: rgba(7, 26, 47, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.head-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; height: 76px; }
.brand { display: flex; align-items: center; gap: 0.7rem; }
.brand-cog { color: var(--cyan); display: grid; place-items: center; }
.brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.brand-name { font-family: var(--f-head); font-weight: 800; font-size: 1.3rem; color: var(--white); letter-spacing: 0.02em; }
.brand-sub { font-family: var(--f-mono); font-size: 0.56rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--cyan-dim); margin-top: 3px; }

.head-nav { display: none; align-items: center; gap: 1.7rem; }
.head-nav a {
  font-family: var(--f-mono); font-size: 0.82rem; color: var(--ink); letter-spacing: 0.02em;
  padding-bottom: 3px; border-bottom: 1px solid transparent; transition: color 0.15s ease, border-color 0.15s ease;
}
.head-nav a:hover { color: var(--cyan); border-color: var(--cyan); }
.head-cta { display: none; }
@media (min-width: 1060px) { .head-nav { display: flex; } .head-cta { display: inline-flex; } }

.nav-toggle-input { display: none; }
.nav-burger {
  display: inline-flex; flex-direction: column; gap: 5px; cursor: pointer;
  padding: 9px; border: 1px solid var(--line);
}
.nav-burger span { width: 22px; height: 1.5px; background: var(--cyan); display: block; }
.mobile-menu { display: none; flex-direction: column; gap: 0.2rem; padding: 0.5rem 0 1.2rem; }
.mobile-menu a { font-family: var(--f-mono); padding: 0.7rem 0.3rem; font-size: 0.85rem; border-bottom: 1px solid var(--line-soft); }
.nav-toggle-input:checked ~ .mobile-menu { display: flex; }
@media (min-width: 1060px) { .nav-burger { display: none; } }

/* -------- Hero -------- */
.hero { padding-block: 3.5rem; border-bottom: 1px solid var(--line); }
@media (min-width: 768px) { .hero { padding-block: 5.5rem; } }
.hero-grid { display: grid; gap: 3rem; align-items: center; }
@media (min-width: 940px) { .hero-grid { grid-template-columns: 1.1fr 0.9fr; } }
.hero-copy h1 { margin-block: 0.4rem 1.5rem; }

.stat-board {
  display: grid; grid-template-columns: repeat(2, 1fr); margin-top: 2.4rem;
  border: 1px solid var(--line);
}
@media (min-width: 560px) { .stat-board { grid-template-columns: repeat(4, 1fr); } }
.stat-cell { padding: 1.1rem 1rem; border-right: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }
.stat-num { display: block; font-family: var(--f-head); font-weight: 800; font-size: 1.7rem; color: var(--amber); line-height: 1; }
.stat-cap { display: block; font-family: var(--f-mono); font-size: 0.6rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--dim); margin-top: 0.5rem; }

.hero-schema { display: flex; justify-content: center; }
.schema {
  margin: 0; padding: 1.4rem; width: 100%; max-width: 30rem;
  border: 1px solid var(--line); background: rgba(14, 51, 87, 0.35);
  position: relative;
}
.schema::before, .schema::after {
  content: ""; position: absolute; width: 12px; height: 12px; border: 1px solid var(--cyan);
}
.schema::before { top: 6px; left: 6px; border-right: 0; border-bottom: 0; }
.schema::after { bottom: 6px; right: 6px; border-left: 0; border-top: 0; }
.schema svg { width: 100%; height: auto; }
.schema figcaption { font-family: var(--f-mono); font-size: 0.68rem; letter-spacing: 0.08em; color: var(--cyan-dim); text-align: center; margin-top: 0.9rem; text-transform: uppercase; }

/* -------- Sections -------- */
.sect { padding-block: 4rem; }
@media (min-width: 768px) { .sect { padding-block: 6rem; } }
.sect--panel { background: rgba(10, 37, 64, 0.5); border-block: 1px solid var(--line); }
.sect--cta { border-top: 1px solid var(--line); }
.sect-head { display: flex; flex-wrap: wrap; gap: 1rem; align-items: flex-end; justify-content: space-between; margin-bottom: 2.4rem; }
.sect-head h2 { margin-top: 0.3rem; }

/* -------- Specimen cards -------- */
.spec-grid { display: grid; gap: 1.2rem; grid-template-columns: 1fr; }
@media (min-width: 620px) { .spec-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 980px) { .spec-grid { grid-template-columns: repeat(3, 1fr); } }
.spec {
  display: block; padding: 1.5rem; border: 1px solid var(--line);
  background: rgba(14, 51, 87, 0.3); transition: border-color 0.18s ease, background 0.18s ease, transform 0.18s ease;
}
.spec:hover { border-color: var(--cyan); background: rgba(14, 51, 87, 0.55); transform: translateY(-3px); }
.spec-top { display: flex; align-items: center; justify-content: space-between; gap: 0.6rem; margin-bottom: 1rem; }
.spec-code { font-size: 0.72rem; color: var(--amber); letter-spacing: 0.1em; }
.spec-fam { font-family: var(--f-mono); font-size: 0.6rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--dim); }
.spec h3 { font-size: 1.35rem; margin-bottom: 0.5rem; }
.spec p { color: var(--ink); font-size: 0.95rem; }

/* -------- Families -------- */
.fam-row { display: grid; gap: 1.2rem; grid-template-columns: 1fr; }
@media (min-width: 620px) { .fam-row { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .fam-row { grid-template-columns: repeat(5, 1fr); } }
.fam {
  display: block; padding: 1.4rem; border: 1px solid var(--line);
  background: rgba(14, 51, 87, 0.3); transition: border-color 0.18s ease, transform 0.18s ease;
}
.fam:hover { border-color: var(--cyan); transform: translateY(-3px); }
.fam-sym { display: block; font-size: 1.7rem; color: var(--cyan); margin-bottom: 0.7rem; line-height: 1; }
.fam h3 { font-size: 1.1rem; margin-bottom: 0.4rem; }
.fam p { font-size: 0.85rem; color: var(--dim); }

/* -------- Split (copy + sequence) -------- */
.split { display: grid; gap: 2.4rem; align-items: center; }
@media (min-width: 840px) { .split { grid-template-columns: 1fr 1fr; gap: 3.5rem; } }

/* -------- Sequence list -------- */
.seq { list-style: none; counter-reset: s; margin: 0; padding: 0; display: grid; gap: 0.8rem; }
.seq li {
  position: relative; counter-increment: s; padding: 0.8rem 1rem 0.8rem 3.2rem;
  border: 1px solid var(--line-soft); background: rgba(14, 51, 87, 0.3);
}
.seq li::before {
  content: "[" counter(s, decimal-leading-zero) "]"; position: absolute; left: 0.8rem; top: 0.8rem;
  font-family: var(--f-mono); font-size: 0.76rem; color: var(--cyan);
}
.seq--tight li { padding-block: 0.6rem; font-size: 0.92rem; }

/* -------- Combos -------- */
.combo-grid { display: grid; gap: 1.4rem; grid-template-columns: 1fr; }
@media (min-width: 760px) { .combo-grid { grid-template-columns: repeat(2, 1fr); } }
.combo, .combo-block {
  padding: 1.8rem; border: 1px solid var(--line); background: rgba(14, 51, 87, 0.3);
}
.combo-eq {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem; margin-bottom: 1rem;
  font-size: 0.82rem; color: var(--cyan);
}
.combo-eq .plus { color: var(--amber); font-size: 1.1rem; }
.combo h3, .combo-block h2 { font-size: 1.3rem; margin-bottom: 0.5rem; }
.combo p, .combo-block p { color: var(--ink); font-size: 0.95rem; }
.combo-stack { display: grid; gap: 1.4rem; }
@media (min-width: 760px) { .combo-stack { grid-template-columns: repeat(2, 1fr); } }
.combo-code { display: block; font-size: 0.7rem; color: var(--amber); letter-spacing: 0.14em; margin-bottom: 0.8rem; }

/* -------- CTA -------- */
.cta {
  display: grid; gap: 1.6rem; align-items: center; padding: 2.4rem;
  border: 1px solid var(--cyan); background: rgba(14, 51, 87, 0.5);
}
@media (min-width: 840px) { .cta { grid-template-columns: 1.6fr 1fr; padding: 3rem; } }
.cta .btn-row { margin-top: 0; }

/* -------- Page head (interior) -------- */
.page-head { padding-block: 3.5rem; border-bottom: 1px solid var(--line); }
@media (min-width: 768px) { .page-head { padding-block: 5rem; } }
.page-head h1 { margin-block: 0.3rem 1.2rem; }

/* -------- Mechanic sheets -------- */
.mech-stack { display: grid; gap: 1.6rem; }
.sheet { border: 1px solid var(--line); background: rgba(14, 51, 87, 0.3); }
.sheet-head {
  display: flex; align-items: center; justify-content: space-between; gap: 0.6rem;
  padding: 0.8rem 1.4rem; border-bottom: 1px solid var(--line);
  background: rgba(124, 211, 255, 0.05);
}
.sheet-code { font-size: 0.8rem; color: var(--amber); letter-spacing: 0.12em; }
.sheet-fam { font-family: var(--f-mono); font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--cyan-dim); }
.sheet-body { padding: 1.6rem; }
@media (min-width: 768px) { .sheet-body { padding: 2rem; } }
.sheet-body h2 { font-size: 1.8rem; }
.sheet-one { color: var(--amber); font-family: var(--f-mono); font-size: 0.92rem; margin-top: 0.4rem; }
.sheet-desc { color: var(--ink); margin-top: 1rem; max-width: 60rem; }
.sheet-cols { display: grid; gap: 2rem; margin-top: 1.8rem; padding-top: 1.6rem; border-top: 1px solid var(--line-soft); }
@media (min-width: 820px) { .sheet-cols { grid-template-columns: 1.3fr 1fr; } }
.sheet-feel { color: var(--ink); font-style: italic; }
.chips { list-style: none; display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0; padding: 0; }
.chips li {
  font-family: var(--f-mono); font-size: 0.72rem; color: var(--ink);
  padding: 0.35rem 0.7rem; border: 1px solid var(--line);
}

/* -------- Family blocks -------- */
.fam-stack { display: grid; gap: 1.6rem; }
.fam-block {
  display: grid; gap: 1.6rem; padding: 2rem; border: 1px solid var(--line); background: rgba(14, 51, 87, 0.3);
}
@media (min-width: 800px) { .fam-block { grid-template-columns: 0.7fr 1.3fr; } }
.fam-mark .fam-sym { font-size: 2.4rem; }
.fam-mark h2 { font-size: 1.5rem; }
.fam-detail { border-left: 1px solid var(--line-soft); padding-left: 1.6rem; }
@media (max-width: 799px) { .fam-detail { border-left: 0; padding-left: 0; border-top: 1px solid var(--line-soft); padding-top: 1.4rem; } }

/* -------- Principles -------- */
.prin-stack { display: grid; gap: 1.6rem; }
.prin { display: grid; gap: 1.8rem; padding: 2rem; border: 1px solid var(--line); background: rgba(14, 51, 87, 0.3); }
@media (min-width: 820px) { .prin { grid-template-columns: 1fr 1.15fr; align-items: start; } }

/* -------- Glossary -------- */
.term-grid { display: grid; gap: 1.2rem; grid-template-columns: 1fr; }
@media (min-width: 640px) { .term-grid { grid-template-columns: repeat(2, 1fr); } }
.term { padding: 1.4rem; border: 1px solid var(--line); border-left: 3px solid var(--cyan); background: rgba(14, 51, 87, 0.3); }
.term h2 { font-size: 1.05rem; color: var(--cyan); margin-bottom: 0.4rem; letter-spacing: 0.02em; }
.term p { color: var(--ink); font-size: 0.92rem; }

/* -------- Contact / forms -------- */
.spec-list { display: grid; gap: 1.3rem; margin: 1.5rem 0 0; }
.spec-list div { display: flex; flex-direction: column; }
.spec-list dt { font-size: 0.72rem; color: var(--cyan-dim); letter-spacing: 0.08em; }
.spec-list dd { margin: 0.25rem 0 0; color: var(--white); }
.form-box { padding: 1.8rem; border: 1px solid var(--line); background: rgba(14, 51, 87, 0.4); }
.field { display: grid; margin-bottom: 1.1rem; }
.field label { font-size: 0.72rem; color: var(--cyan-dim); margin-bottom: 0.4rem; letter-spacing: 0.06em; }
.req { color: var(--amber); margin-left: 3px; }
.input, .textarea {
  width: 100%; font-family: var(--f-body); font-size: 0.95rem; color: var(--white);
  background: var(--navy-900); border: 1px solid var(--line); padding: 0.7rem 0.9rem; outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.textarea { resize: vertical; }
.input:focus, .textarea:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(124, 211, 255, 0.14); }
.form-done { display: flex; gap: 1rem; align-items: flex-start; padding: 2rem; border: 1px solid var(--cyan); background: rgba(14, 51, 87, 0.5); }
.form-done[hidden] { display: none; }
.tick { display: grid; place-items: center; width: 42px; height: 42px; flex-shrink: 0; color: var(--navy-900); background: var(--cyan); font-size: 1.2rem; }

/* -------- FAQ -------- */
.faq-group { margin-bottom: 2.6rem; }
.faq-item { border: 1px solid var(--line); background: rgba(14, 51, 87, 0.3); margin-bottom: 0.8rem; }
.faq-item summary {
  cursor: pointer; list-style: none; padding: 1.1rem 1.3rem; display: flex; justify-content: space-between; gap: 1.2rem;
  font-family: var(--f-head); font-weight: 600; font-size: 1.05rem; color: var(--white);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; color: var(--cyan); font-family: var(--f-mono); font-size: 1.3rem; line-height: 1; }
.faq-item[open] summary::after { content: "−"; }
.faq-item p { padding: 0 1.3rem 1.2rem; color: var(--dim); }

/* -------- Prose (legal) -------- */
.prose { max-width: 48rem; }
.prose h2 { font-size: 1.35rem; margin-top: 2.2rem; margin-bottom: 0.7rem; }
.prose p { margin-bottom: 1rem; color: var(--dim); }
.prose a { color: var(--cyan); text-decoration: underline; text-underline-offset: 3px; }

/* -------- Footer -------- */
.foot { border-top: 1px solid var(--line); background: rgba(7, 26, 47, 0.7); }
.foot-grid { display: grid; gap: 2.2rem; padding-block: 3.4rem; }
@media (min-width: 820px) { .foot-grid { grid-template-columns: 1.7fr repeat(4, 1fr); } }
.foot-brand .brand-cog { color: var(--amber); }
.foot-brand p { margin-top: 1rem; color: var(--dim); max-width: 22rem; font-size: 0.9rem; }
.foot-socials { display: flex; flex-wrap: wrap; gap: 0.6rem 1.1rem; margin-top: 1.2rem; }
.foot-socials a { font-family: var(--f-mono); font-size: 0.78rem; color: var(--cyan); border-bottom: 1px solid transparent; }
.foot-socials a:hover { border-color: var(--cyan); }
.foot-col h4 { font-family: var(--f-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--cyan-dim); margin-bottom: 1rem; font-weight: 500; }
.foot-col ul { list-style: none; padding: 0; margin: 0; }
.foot-col li { margin-bottom: 0.6rem; }
.foot-col li a { font-size: 0.9rem; color: var(--dim); }
.foot-col li a:hover { color: var(--cyan); }
.foot-base { display: flex; flex-direction: column; gap: 0.6rem; padding-block: 1.6rem; border-top: 1px solid var(--line-soft); font-size: 0.8rem; color: var(--dim); }
@media (min-width: 768px) { .foot-base { flex-direction: row; justify-content: space-between; align-items: center; } }

/* -------- Skip link + reveal -------- */
.skip-link { position: absolute; left: -999px; }
.skip-link:focus { left: 1rem; top: 1rem; z-index: 100; background: var(--amber); color: var(--navy-900); padding: 0.6rem 1rem; }

.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
  .spec:hover, .fam:hover { transform: none; }
}