/* K10 Books — main stylesheet (original design system).
   Depends on tokens.css. See crawl-raw/DESIGN-SYSTEM.md. */

/* ------------------------------------------------------------------ Reset */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--k10-sans);
  color: var(--k10-ink);
  background: var(--k10-silver-200);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
img { max-width: 100%; display: block; }
a { color: var(--k10-navy); text-decoration: none; }
a:hover { color: var(--k10-navy-700); text-decoration: underline; }
h1, h2, h3, h4 { font-family: var(--k10-serif); color: var(--k10-navy); line-height: 1.2; margin: 0 0 .5em; }
p { margin: 0 0 1em; }
ul { margin: 0 0 1em; padding-left: 1.2em; }

.k10-visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

/* --------------------------------------------------------------- Layout */
.k10-container {
  width: 100%;
  max-width: var(--k10-maxw);
  margin-inline: auto;
  padding-inline: var(--k10-pad);
}
main { flex: 1 0 auto; display: block; }
.k10-section { padding-block: clamp(40px, 6vw, 72px); }
.k10-section--tight { padding-block: clamp(28px, 4vw, 48px); }
.k10-section--alt { background: var(--k10-white); }

.k10-section__head { text-align: center; max-width: 720px; margin: 0 auto clamp(24px, 4vw, 44px); }
.k10-section__head h2 { font-size: clamp(26px, 3.4vw, 36px); }
.k10-section__head p { color: var(--k10-muted); font-size: 18px; margin: 0; }

/* --------------------------------------------------------------- Buttons */
.btn-primary, .btn-accent, .btn-ghost {
  display: inline-block;
  font-family: var(--k10-sans);
  font-weight: 600;
  font-size: 16px;
  line-height: 1;
  padding: 14px 24px;
  border-radius: 8px;
  border: 2px solid transparent;
  cursor: pointer;
  text-align: center;
  transition: transform .08s ease, background-color .15s ease, box-shadow .15s ease;
}
.btn-primary:hover, .btn-accent:hover, .btn-ghost:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--k10-navy); color: var(--k10-white); }
.btn-primary:hover { background: var(--k10-navy-700); color: var(--k10-white); }
.btn-accent { background: var(--k10-accent); color: var(--k10-navy-deep); }
.btn-accent:hover { background: #f0c064; color: var(--k10-navy-deep); }
.btn-ghost { background: transparent; color: var(--k10-navy); border-color: var(--k10-navy); }
.btn-ghost:hover { background: var(--k10-navy); color: var(--k10-white); }
.btn-block { display: block; width: 100%; }

/* ---------------------------------------------------------------- Header */
.k10-header {
  background: var(--k10-navy-deep);
  color: var(--k10-white);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 2px 12px rgba(0,0,0,.18);
}
.k10-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 72px;
}
.k10-brand { display: flex; align-items: center; gap: 12px; }
.k10-brand:hover { text-decoration: none; }
.k10-brand img { height: 44px; width: auto; border-radius: 6px; background: var(--k10-white); padding: 3px; }
.k10-brand__name { font-family: var(--k10-serif); font-size: 22px; font-weight: 700; color: var(--k10-white); letter-spacing: .3px; }

.k10-nav { display: flex; }
.k10-nav__list { display: flex; align-items: center; gap: 4px; list-style: none; margin: 0; padding: 0; }
.k10-nav__link {
  display: inline-block;
  color: #cdd6ee;
  padding: 10px 14px;
  border-radius: 6px;
  font-weight: 500;
  font-size: 15px;
}
.k10-nav__link:hover { color: var(--k10-white); background: rgba(255,255,255,.08); text-decoration: none; }
.k10-nav__link[aria-current="page"] { color: var(--k10-white); background: rgba(232,176,75,.18); }

.k10-nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid rgba(255,255,255,.35);
  color: var(--k10-white);
  border-radius: 6px;
  padding: 8px 10px;
  cursor: pointer;
  font-size: 20px;
  line-height: 1;
}

@media (max-width: 860px) {
  .k10-nav-toggle { display: inline-block; }
  .k10-nav {
    position: absolute;
    top: 72px; left: 0; right: 0;
    background: var(--k10-navy-deep);
    display: none;
    box-shadow: 0 12px 24px rgba(0,0,0,.28);
  }
  .k10-nav.is-open { display: block; }
  .k10-nav__list { flex-direction: column; align-items: stretch; padding: 8px var(--k10-pad) 16px; gap: 2px; }
  .k10-nav__link { padding: 12px 14px; font-size: 16px; }
}

/* ------------------------------------------------------------------ Hero */
.k10-hero {
  background: linear-gradient(135deg, var(--k10-navy-deep) 0%, var(--k10-navy) 55%, var(--k10-navy-700) 100%);
  color: var(--k10-white);
  padding-block: clamp(48px, 8vw, 96px);
}
.k10-hero__inner { max-width: 760px; }
.k10-hero h1 { color: var(--k10-white); font-size: clamp(32px, 6vw, 52px); margin-bottom: .3em; }
.k10-hero p { font-size: clamp(17px, 2.2vw, 21px); color: #dfe6f7; margin-bottom: 1.6em; }
.k10-hero__actions { display: flex; flex-wrap: wrap; gap: 14px; }

/* ----------------------------------------------------------- Book grid */
.k10-book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 28px;
}
.k10-book-card {
  background: var(--k10-white);
  border-radius: var(--k10-radius);
  box-shadow: var(--k10-shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform .12s ease, box-shadow .12s ease;
}
.k10-book-card:hover { transform: translateY(-4px); box-shadow: var(--k10-shadow-lg); }
.k10-book-card__cover { aspect-ratio: var(--k10-cover-ratio); overflow: hidden; background: var(--k10-silver); }
.k10-book-card__cover img { width: 100%; height: 100%; object-fit: cover; }
.k10-book-card__body { padding: 14px 16px 18px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.k10-book-card__title { font-family: var(--k10-serif); font-size: 18px; color: var(--k10-navy); margin: 0; line-height: 1.25; }
.k10-book-card__title a:hover { text-decoration: none; }
.k10-book-card__author { font-size: 14px; color: var(--k10-muted); margin: 0; }
.k10-book-card__cta { margin-top: auto; padding-top: 10px; }

.k10-pill {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--k10-silver);
  color: var(--k10-navy);
}
.k10-pill--free { background: var(--k10-accent); color: var(--k10-navy-deep); }

/* --------------------------------------------------------- Author cards */
.k10-author-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}
.k10-author-card {
  background: var(--k10-white);
  border-radius: var(--k10-radius);
  box-shadow: var(--k10-shadow);
  padding: 24px;
  text-align: center;
  transition: transform .12s ease, box-shadow .12s ease;
}
.k10-author-card:hover { transform: translateY(-4px); box-shadow: var(--k10-shadow-lg); }
.k10-avatar {
  width: 76px; height: 76px;
  margin: 0 auto 14px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--k10-navy), var(--k10-navy-700));
  color: var(--k10-white);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--k10-serif); font-size: 28px; font-weight: 700;
}
.k10-author-card h3 { margin: 0 0 4px; font-size: 20px; }
.k10-author-card__role { color: var(--k10-muted); font-size: 14px; margin: 0 0 10px; }

/* --------------------------------------------------------- Series banner */
.k10-series-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.k10-series-banner {
  border-radius: var(--k10-radius);
  color: var(--k10-white);
  padding: 32px 28px;
  box-shadow: var(--k10-shadow);
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 180px;
}
.k10-series-banner h3 { color: var(--k10-white); font-size: 24px; margin: 0; }
.k10-series-banner p { color: rgba(255,255,255,.9); margin: 0; }
.k10-series-banner__cta { margin-top: auto; }
.k10-series-banner--insomnia { background: linear-gradient(135deg, #001640, #12327a); }
.k10-series-banner--ggh { background: linear-gradient(135deg, #c4424a, #e8b04b); }

/* ------------------------------------------------------ Content prose */
.k10-prose { max-width: 760px; margin-inline: auto; }
.k10-prose h1 { font-size: clamp(30px, 5vw, 44px); }
.k10-prose h2 { font-size: clamp(22px, 3vw, 30px); margin-top: 1.4em; }
.k10-prose p, .k10-prose li { font-size: 17px; color: var(--k10-ink); }
.k10-page-head { background: var(--k10-white); border-bottom: 1px solid var(--k10-border); }
.k10-page-head .k10-container { padding-block: clamp(32px, 5vw, 56px); }
.k10-page-head h1 { margin-bottom: .2em; }
.k10-page-head p { color: var(--k10-muted); font-size: 18px; max-width: 680px; margin: 0; }

/* ------------------------------------------------------------------ Forms */
.k10-form-card {
  background: var(--k10-white);
  border-radius: var(--k10-radius);
  box-shadow: var(--k10-shadow);
  padding: clamp(24px, 4vw, 40px);
  max-width: 620px;
  margin-inline: auto;
}
.k10-field { margin-bottom: 18px; }
.k10-field label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 15px; }
.k10-field input, .k10-field textarea {
  width: 100%;
  font: inherit;
  padding: 12px 14px;
  border: 1px solid var(--k10-border);
  border-radius: 8px;
  background: var(--k10-white);
  color: var(--k10-ink);
}
.k10-field input:focus, .k10-field textarea:focus {
  outline: none;
  border-color: var(--k10-navy);
  box-shadow: 0 0 0 3px rgba(0,32,96,.12);
}
.k10-field textarea { min-height: 140px; resize: vertical; }

/* Honeypot — visually hidden but NOT display:none (bots skip those). */
.k10-hp {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px; height: 0;
  overflow: hidden;
}

.k10-form-status {
  margin: 10px 0 0;
  font-size: 15px;
  font-weight: 600;
  min-height: 1.2em;
}
.k10-form-status.is-success { color: var(--k10-success); }
.k10-form-status.is-error { color: var(--k10-error); }

/* ------------------------------------------------------- Newsletter band */
.k10-newsletter {
  background: linear-gradient(135deg, var(--k10-navy) 0%, var(--k10-navy-700) 100%);
  color: var(--k10-white);
  padding-block: clamp(36px, 5vw, 56px);
}
.k10-newsletter__inner {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}
.k10-newsletter__copy h2 { color: var(--k10-white); font-size: clamp(24px, 3vw, 32px); margin-bottom: .3em; }
.k10-newsletter__copy p { color: #dfe6f7; margin: 0; }
.k10-signup-form { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-start; }
.k10-signup-form input[type="email"], .k10-signup-form input[type="text"] {
  flex: 1 1 220px;
  font: inherit;
  padding: 13px 16px;
  border: 0;
  border-radius: 8px;
  min-width: 0;
}
.k10-signup-form .btn-accent { flex: 0 0 auto; }
.k10-signup-form .k10-form-status { flex-basis: 100%; }

/* Expanded variant on the free-books hero */
.k10-signup-form--stacked { flex-direction: column; }
.k10-signup-form--stacked input { flex-basis: auto; width: 100%; }
.k10-signup-form--stacked .btn-accent { width: 100%; }

@media (max-width: 760px) {
  .k10-newsletter__inner { grid-template-columns: 1fr; }
}

/* ------------------------------------------------------------------ Footer */
.k10-footer {
  background: var(--k10-navy-deep);
  color: #b9c4de;
  flex-shrink: 0;
  padding-block: clamp(36px, 5vw, 56px) 24px;
}
.k10-footer a { color: #cdd6ee; }
.k10-footer a:hover { color: var(--k10-white); }
.k10-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}
.k10-footer__brand { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.k10-footer__brand img { height: 40px; width: auto; border-radius: 6px; background: var(--k10-white); padding: 3px; }
.k10-footer__brand span { font-family: var(--k10-serif); font-size: 20px; font-weight: 700; color: var(--k10-white); }
.k10-footer__blurb { max-width: 460px; margin: 0; font-size: 15px; }
.k10-footer__nav h4 { color: var(--k10-white); font-size: 15px; text-transform: uppercase; letter-spacing: .06em; margin-bottom: 12px; }
.k10-footer__nav ul { list-style: none; margin: 0; padding: 0; columns: 2; column-gap: 24px; }
.k10-footer__nav li { margin-bottom: 8px; break-inside: avoid; }
.k10-footer__bottom {
  border-top: 1px solid rgba(255,255,255,.12);
  margin-top: 32px;
  padding-top: 18px;
  font-size: 14px;
  color: #96a3c4;
}

@media (max-width: 760px) {
  .k10-footer__grid { grid-template-columns: 1fr; }
}

/* ------------------------------------------------------------- Utilities */
.k10-lead { font-size: 19px; color: var(--k10-muted); }
.text-center { text-align: center; }
.mt-2 { margin-top: 16px; } .mt-3 { margin-top: 24px; } .mt-4 { margin-top: 32px; }
.k10-breadcrumb { font-size: 14px; color: var(--k10-muted); margin-bottom: 16px; }
.k10-breadcrumb a { color: var(--k10-muted); }
.k10-note {
  background: #fff8e8;
  border: 1px solid var(--k10-accent);
  border-radius: 8px;
  padding: 14px 16px;
  font-size: 14px;
  color: #6b5417;
}

/* =========================================================================
   Phase 3 additions — author profile, series header, book detail
   ========================================================================= */

/* ------------------------------------------------------- Author profile */
.k10-author-profile {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}
.k10-author-profile__aside { text-align: center; }
.k10-author-profile__bio { max-width: none; }
.k10-avatar--lg {
  width: 160px;
  height: 160px;
  font-size: 58px;
  margin: 0 auto;
}
@media (max-width: 760px) {
  .k10-author-profile { grid-template-columns: 1fr; }
  .k10-avatar--lg { width: 120px; height: 120px; font-size: 44px; }
}

/* -------------------------------------------------------- Series header */
.k10-serieshead {
  color: var(--k10-white);
  padding-block: clamp(40px, 6vw, 72px);
}
.k10-serieshead h1 { color: var(--k10-white); font-size: clamp(30px, 5vw, 48px); margin-bottom: .25em; }
.k10-serieshead__by { color: rgba(255,255,255,.9); font-size: 17px; margin-bottom: .8em; }
.k10-serieshead__by a { color: var(--k10-white); text-decoration: underline; }
.k10-serieshead__desc { color: rgba(255,255,255,.92); font-size: clamp(17px, 2.2vw, 20px); max-width: 720px; margin: 0; }
.k10-serieshead--insomnia { background: linear-gradient(135deg, #001640 0%, #12327a 100%); }
.k10-serieshead--ggh { background: linear-gradient(135deg, #c4424a 0%, #e8b04b 100%); }

/* ---------------------------------------------------------- Book detail */
.k10-book-detail {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}
.k10-book-detail__cover {
  border-radius: var(--k10-radius);
  overflow: hidden;
  box-shadow: var(--k10-shadow-lg);
  aspect-ratio: var(--k10-cover-ratio);
  background: var(--k10-silver);
}
.k10-book-detail__cover img { width: 100%; height: 100%; object-fit: cover; }
.k10-book-detail__info h1 { font-size: clamp(28px, 4vw, 40px); margin: 10px 0 .3em; }
.k10-book-detail__author { font-size: 18px; color: var(--k10-ink); margin: 0 0 4px; }
.k10-book-detail__series { font-size: 15px; color: var(--k10-muted); margin: 0 0 20px; }
.k10-book-detail__desc { margin-bottom: 24px; }
.k10-book-detail__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 18px; }
.k10-book-detail__note { font-size: 14px; color: var(--k10-muted); margin: 0; }
@media (max-width: 760px) {
  .k10-book-detail { grid-template-columns: 1fr; }
  .k10-book-detail__cover { max-width: 260px; margin-inline: auto; }
}

/* Manuscript-submission form: muted "(optional)" label hint (Phase 2). */
.k10-optional{color:var(--muted,#6b7280);font-weight:400;font-size:.85em;}