/* ============================================================
   components.css — section + component styles
   ============================================================ */

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--step-small);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.85rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: background 0.15s var(--ease), border-color 0.15s var(--ease),
              transform 0.15s var(--ease), color 0.15s var(--ease);
  text-decoration: none;
  line-height: 1;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary { background: var(--alarm-red); color: #fff; border-color: var(--alarm-red); }
.btn--primary:hover { background: var(--alarm-red-hover); color: #fff; }

.btn--ghost { background: transparent; color: var(--bone); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--cream); color: var(--cream); }

.btn--small { padding: 0.5rem 0.9rem; font-size: 0.72rem; }
.btn--block { width: 100%; }

/* ---------- Nav ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease);
  border-bottom: 1px solid transparent;
}
.nav.is-stuck {
  background: rgba(18, 6, 10, 0.92);
  backdrop-filter: blur(8px);
  border-bottom-color: var(--line);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.85rem;
}
.nav__brand {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--bone);
  font-weight: 600;
  white-space: nowrap;
}
.nav__brand:hover { color: var(--bone); text-decoration: none; }
.nav__brand b { color: var(--alarm-red); font-weight: 600; }
.nav__links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
  padding: 0;
}
.nav__links a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--bone-dim);
}
.nav__links a:hover { color: var(--bone); text-decoration: none; }

.nav__toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--bone);
  padding: 0.4rem 0.6rem;
  font-family: var(--font-mono);
}

@media (max-width: 760px) {
  .nav__links { display: none; }
  .nav__links.is-open {
    display: flex;
    position: absolute;
    inset: 100% 0 auto 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    background: rgba(18, 6, 10, 0.98);
    border-bottom: 1px solid var(--line);
    padding: 1.25rem var(--gutter);
  }
  .nav__toggle { display: inline-flex; }
  .nav__cta-desktop { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--near-black);
}
/* Fallback chain layer 3: CSS hairline grid */
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-color: var(--near-black);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 44px 44px;
  background-position: center;
}
/* Fallback chain layer 2: static poster */
.hero__poster {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.9;
}
/* Layer 1: the 3D canvas is injected here */
.hero__canvas {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
}
/* Darkening gradient for legibility */
.hero__scrim {
  position: absolute;
  inset: 0;
  z-index: 3;
  background: linear-gradient(
    100deg,
    rgba(18, 6, 10, 0.92) 0%,
    rgba(18, 6, 10, 0.72) 42%,
    rgba(18, 6, 10, 0.30) 100%
  );
}
.hero__content {
  position: relative;
  z-index: 4;
  padding-block: 7rem 3rem;
  max-width: 46rem;
}
.hero h1 {
  margin-block: 0.5rem 0.75rem;
  letter-spacing: 0.005em;
}
.hero__sub {
  font-style: italic;
  color: var(--bone);
  font-size: clamp(1.05rem, 2vw, 1.4rem);
  max-width: 40ch;
}
.hero__pitch {
  color: var(--bone-dim);
  margin-top: 1.25rem;
  max-width: 48ch;
}
.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.75rem;
}
.hero__trust {
  margin-top: 1.75rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--bone-dim);
  max-width: 54ch;
  border-left: 2px solid var(--alarm-red);
  padding-left: 0.9rem;
}

/* ---------- Value / the gap ---------- */
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space);
  margin-top: 2.5rem;
}
.value-card {
  border-top: 2px solid var(--alarm-red);
  padding-top: 1.1rem;
}
.value-card p { color: var(--bone); }
.value-card .n {
  font-family: var(--font-mono);
  color: var(--alarm-red);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 0.6rem;
}
@media (max-width: 760px) {
  .value-grid { grid-template-columns: 1fr; gap: 2rem; }
}

/* mono chip for inline vuln class names */
.chip {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--alarm-red-dim);
  color: var(--bone);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.05em 0.4em;
  white-space: nowrap;
}

/* ---------- Sample chapter lead magnet ---------- */
.sample {
  background: var(--oxblood);
  background-image: linear-gradient(160deg, var(--oxblood) 0%, var(--oxblood-deep) 100%);
}
.sample__card {
  border: 1px solid var(--cream);
  border-radius: var(--radius);
  padding: clamp(1.75rem, 4vw, 3.25rem);
  max-width: 720px;
  margin-inline: auto;
  background: rgba(18, 6, 10, 0.35);
}
.sample__card h2 { color: var(--cream); }
.sample__card p { color: var(--bone); }
.form { margin-top: 1.75rem; }
.form__row { display: flex; flex-direction: column; gap: 0.4rem; margin-bottom: 1rem; }
.form__row label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--bone-dim);
}
.form input[type="email"] {
  font-family: var(--font-mono);
  background: var(--near-black);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--bone);
  padding: 0.85rem 1rem;
  width: 100%;
}
.form input[type="email"]:focus { border-color: var(--alarm-red); outline: none; }
.form input[type="email"]::placeholder { color: var(--bone-dim); }

.form__consent {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.9rem;
  color: var(--bone);
  cursor: pointer;
}
.form__consent input { margin-top: 0.25rem; accent-color: var(--alarm-red); flex: none; }

/* honeypot: visually + programmatically hidden, but present for bots */
.hp {
  position: absolute !important;
  left: -9999px !important;
  width: 1px; height: 1px;
  overflow: hidden;
}

.form__status {
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  min-height: 1.2em;
}
.form__status.is-success { color: var(--cream); }
.form__status.is-error { color: var(--alarm-red); }
.form__note { font-size: 0.78rem; color: var(--bone-dim); margin-top: 0.75rem; }

/* ---------- What's inside ---------- */
.parts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin-top: 2.5rem;
  background: var(--line);
  border: 1px solid var(--line);
}
.part {
  background: var(--near-black);
  padding: 1.5rem;
}
.part__n {
  font-family: var(--font-mono);
  color: var(--alarm-red);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}
.part h3 {
  font-family: var(--font-ui);
  text-transform: none;
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.3;
  letter-spacing: 0;
  margin-top: 0.5rem;
}
.part p { color: var(--bone-dim); font-size: 0.92rem; margin-top: 0.4rem; }
@media (max-width: 640px) { .parts { grid-template-columns: 1fr; } }

.statstrip {
  margin-top: 2rem;
  font-family: var(--font-mono);
  color: var(--cream);
  font-size: clamp(0.95rem, 2vw, 1.2rem);
  letter-spacing: 0.04em;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding-block: 1.1rem;
  text-align: center;
}

/* ---------- Reproducibility + repo ---------- */
.repro { background: linear-gradient(180deg, var(--near-black), var(--oxblood-deep)); }
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.5rem;
}
.repo-card {
  margin-top: 2.5rem;
  border: 1px solid var(--cream);
  border-radius: var(--radius);
  padding: clamp(1.5rem, 3vw, 2.25rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  background: rgba(18, 6, 10, 0.4);
}
.repo-card__meta { max-width: 44ch; }
.repo-card__meta .mono { color: var(--cream); font-size: 0.85rem; }
.repo-card__meta p { color: var(--bone-dim); margin-top: 0.4rem; font-size: 0.95rem; }

/* ---------- Living updates hub ---------- */
.tabs {
  display: flex;
  gap: 0.5rem;
  margin-top: 2rem;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--line);
}
.tab {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--bone-dim);
  padding: 0.75rem 1rem;
  margin-bottom: -1px;
}
.tab[aria-selected="true"] { color: var(--bone); border-bottom-color: var(--alarm-red); }
.tab:hover { color: var(--bone); }

.tabpanel { padding-top: 1.75rem; }
.tabpanel[hidden] { display: none; }
.tabpanel__updated {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--bone-dim);
  margin-bottom: 1rem;
}

.data-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.data-table th, .data-table td {
  text-align: left;
  padding: 0.75rem 0.9rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.data-table th {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--bone-dim);
  font-weight: 600;
}
.data-table td .mono { color: var(--cream); }
.table-scroll { overflow-x: auto; }

.errata-list { list-style: none; padding: 0; }
.errata-list li {
  border-left: 2px solid var(--alarm-red);
  padding: 0.5rem 0 0.5rem 1rem;
  margin-bottom: 1rem;
}
.errata-list .ref {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--alarm-red);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ---------- Who + author ---------- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  margin-top: 2.5rem;
}
.two-col h3 {
  font-family: var(--font-ui);
  text-transform: none;
  font-weight: 700;
  letter-spacing: 0;
  margin-bottom: 1rem;
}
.reader-list { list-style: none; padding: 0; }
.reader-list li {
  padding-left: 1.5rem;
  position: relative;
  margin-bottom: 0.85rem;
  color: var(--bone);
}
.reader-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--alarm-red);
}
.author-links { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.25rem; }
@media (max-width: 760px) { .two-col { grid-template-columns: 1fr; } }

/* ---------- Buy band ---------- */
.buy {
  background: var(--oxblood);
  background-image: linear-gradient(180deg, var(--oxblood) 0%, var(--oxblood-deep) 100%);
  border-top: 1px solid var(--cream);
  border-bottom: 1px solid var(--cream);
}
.buy__inner {
  display: grid;
  grid-template-columns: minmax(180px, 260px) 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.buy__cover img {
  border: 1px solid var(--cream);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  width: 100%;
}
.buy__pitch { color: var(--cream); font-size: clamp(1.1rem, 2.4vw, 1.5rem); max-width: 30ch; }
.buy__closer { font-family: var(--font-mono); color: var(--bone); margin-top: 0.75rem; font-size: 0.9rem; }
.buy__buttons { display: flex; flex-wrap: wrap; gap: 0.85rem; margin-top: 1.75rem; }
.buy__isbn { font-family: var(--font-mono); font-size: 0.72rem; color: var(--bone-dim); margin-top: 1.25rem; }
@media (max-width: 640px) {
  .buy__inner { grid-template-columns: 1fr; text-align: center; }
  .buy__cover { max-width: 220px; margin-inline: auto; }
  .buy__buttons { justify-content: center; }
  .buy__pitch, .buy__closer { margin-inline: auto; }
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding-block: 3rem;
  background: var(--near-black);
}
.footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1.5rem;
  align-items: center;
}
.footer__brand {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--bone);
}
.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  list-style: none;
  padding: 0;
}
.footer__links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--bone-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.footer__links a:hover { color: var(--bone); text-decoration: none; }
.footer__copy { font-size: 0.8rem; color: var(--bone-dim); width: 100%; margin-top: 1rem; }
.footer__url { color: var(--alarm-red); font-family: var(--font-mono); }

/* ---------- Generic section header ---------- */
.section__lead { max-width: var(--measure); color: var(--bone-dim); margin-top: 1rem; }
.section h2 + .section__lead { margin-top: 1.25rem; }

/* ---------- Simple content pages (privacy, thanks, 404) ---------- */
.doc { padding-block: clamp(6rem, 12vw, 9rem) var(--section-y); }
.doc h1 { margin-bottom: 1.5rem; }
.doc h2 { font-size: var(--step-h3); margin-top: 2.5rem; margin-bottom: 0.75rem; }
.doc p, .doc li { color: var(--bone); }
.doc ul { padding-left: 1.25rem; margin-top: 0.5rem; }
.doc li { margin-bottom: 0.4rem; }
.doc .back { margin-top: 3rem; display: inline-block; }
.doc time { color: var(--bone-dim); font-family: var(--font-mono); font-size: 0.85rem; }

.centered { text-align: center; max-width: 40rem; margin-inline: auto; }
.centered .btn { margin-top: 2rem; }