/* =========================================================
   Developer to Architect — Companion Site Styles
   devtoarch.com
   ========================================================= */

:root {
  --navy:   #1A3657;
  --navy-d: #122844;
  --gold:   #E8930A;
  --gold-h: #CF7E08;
  --bg:     #F7F8FA;
  --white:  #FFFFFF;
  --text:   #1A1A1A;
  --muted:  #6B7280;
  --border: #E2E8F0;
  --radius: 8px;
  --shadow: 0 2px 12px rgba(26,54,87,0.10);
  --shadow-lg: 0 8px 32px rgba(26,54,87,0.14);
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-serif: Georgia, 'Times New Roman', serif;
  --max: 1100px;
  --gutter: clamp(20px, 5vw, 60px);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.7;
  color: var(--text);
  background: var(--white);
}

a { color: var(--navy); text-decoration: none; }
a:hover { color: var(--gold); }
img { max-width: 100%; display: block; }

/* ── Layout ──────────────────────────────────────────────── */
.container { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.section { padding: 80px 0; }
.section-sm { padding: 48px 0; }
.section-alt { background: var(--bg); }

/* ── Nav ─────────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--navy);
  box-shadow: 0 2px 8px rgba(0,0,0,0.18);
}
.nav__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  gap: 24px;
}
.nav__logo {
  font-weight: 700;
  font-size: 1rem;
  color: var(--white);
  white-space: nowrap;
  letter-spacing: -0.01em;
}
.nav__logo span { color: var(--gold); }
.nav__links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}
.nav__links a {
  color: rgba(255,255,255,0.82);
  font-size: 0.93rem;
  font-weight: 500;
  transition: color 0.15s;
}
.nav__links a:hover, .nav__links a.active { color: var(--white); }
.nav__cta {
  background: var(--gold);
  color: var(--white) !important;
  padding: 7px 18px;
  border-radius: 6px;
  font-weight: 600 !important;
  transition: background 0.15s !important;
}
.nav__cta:hover { background: var(--gold-h) !important; color: var(--white) !important; }

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(150deg, var(--navy-d) 0%, var(--navy) 60%, #1e4a72 100%);
  padding: 80px 0 72px;
  color: var(--white);
}
.hero__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 64px;
  align-items: center;
}
.hero__cover {
  position: relative;
}
.hero__cover img {
  width: 100%;
  border-radius: 6px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.45), 0 4px 16px rgba(0,0,0,0.3);
  transform: perspective(800px) rotateY(-4deg);
}
.hero__eyebrow {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
}
.hero__title {
  font-size: clamp(2.2rem, 4.5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}
.hero__subtitle {
  font-size: 1.2rem;
  font-style: italic;
  color: rgba(255,255,255,0.75);
  margin-bottom: 24px;
  font-family: var(--font-serif);
}
.hero__desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.82);
  margin-bottom: 36px;
  max-width: 540px;
  line-height: 1.65;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; margin-bottom: 36px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
}
.btn-primary {
  background: var(--gold);
  color: var(--white);
}
.btn-primary:hover { background: var(--gold-h); color: var(--white); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(232,147,10,0.35); }
.btn-outline {
  border: 2px solid rgba(255,255,255,0.45);
  color: var(--white);
  background: transparent;
}
.btn-outline:hover { border-color: var(--white); color: var(--white); background: rgba(255,255,255,0.08); }
.btn-navy { background: var(--navy); color: var(--white); }
.btn-navy:hover { background: var(--navy-d); color: var(--white); }
.hero__meta { display: flex; flex-wrap: wrap; gap: 24px; }
.hero__meta-item { font-size: 0.88rem; color: rgba(255,255,255,0.6); }
.hero__meta-item strong { color: rgba(255,255,255,0.9); display: block; font-size: 0.95rem; }

/* ── Parts overview ──────────────────────────────────────── */
.parts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 48px;
}
.part-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s, transform 0.2s;
}
.part-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.part-card__number {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 8px;
}
.part-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 10px;
  line-height: 1.3;
}
.part-card__desc {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ── Section headings ────────────────────────────────────── */
.section-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 10px;
}
.section-title {
  font-size: clamp(1.7rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--navy);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.2;
}
.section-lead {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 620px;
  line-height: 1.65;
}

/* ── TOC ─────────────────────────────────────────────────── */
.toc-toggle {
  margin-top: 48px;
}
.toc-toggle summary {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1rem;
  color: var(--navy);
  list-style: none;
  padding: 12px 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  user-select: none;
}
.toc-toggle summary::-webkit-details-marker { display: none; }
.toc-toggle summary::after { content: '›'; transform: rotate(90deg); display: inline-block; transition: transform 0.2s; }
.toc-toggle[open] summary::after { transform: rotate(270deg); }
.toc-body {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}
.toc-part h4 {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--gold);
}
.toc-part ol {
  list-style: none;
  padding: 0;
}
.toc-part ol li {
  font-size: 0.9rem;
  color: var(--text);
  padding: 4px 0;
  border-bottom: 1px solid var(--border);
  line-height: 1.45;
}
.toc-part ol li:last-child { border-bottom: none; }
.ch-num { color: var(--muted); font-size: 0.8rem; margin-right: 4px; }

/* ── Resource cards ──────────────────────────────────────── */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 40px;
}
.resource-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s;
}
.resource-card:hover { box-shadow: var(--shadow-lg); }
.resource-card__icon { font-size: 1.8rem; }
.resource-card__title { font-size: 1rem; font-weight: 700; color: var(--navy); }
.resource-card__chapter { font-size: 0.8rem; color: var(--muted); }
.resource-card__desc { font-size: 0.88rem; color: var(--muted); line-height: 1.55; flex: 1; }
.resource-card__btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  background: var(--navy);
  color: var(--white);
  align-self: flex-start;
  transition: background 0.15s;
}
.resource-card__btn:hover { background: var(--navy-d); color: var(--white); }

/* ── Chapter list ────────────────────────────────────────── */
.chapter-list { margin-top: 12px; }
.chapter-row {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  align-items: flex-start;
}
.chapter-row:last-child { border-bottom: none; }
.chapter-num {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--gold);
  min-width: 42px;
  padding-top: 2px;
}
.chapter-info h4 {
  font-size: 0.97rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 3px;
}
.chapter-info p { font-size: 0.88rem; color: var(--muted); line-height: 1.5; }

/* ── Author ──────────────────────────────────────────────── */
.author-grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  align-items: start;
  margin-top: 40px;
}
.author-avatar {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--border);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
}
.author-name { font-size: 1.6rem; font-weight: 800; color: var(--navy); margin-bottom: 4px; }
.author-title { font-size: 1rem; color: var(--muted); margin-bottom: 16px; }
.author-bio p { font-size: 1rem; color: var(--text); margin-bottom: 14px; line-height: 1.7; }
.author-links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.author-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--navy);
  transition: all 0.15s;
}
.author-link:hover { border-color: var(--navy); background: var(--bg); color: var(--navy); }

/* ── Blog ────────────────────────────────────────────────── */
.blog-grid { display: grid; gap: 28px; margin-top: 40px; }
.blog-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s;
}
.blog-card:hover { box-shadow: var(--shadow-lg); }
.blog-date { font-size: 0.8rem; color: var(--muted); margin-bottom: 8px; }
.blog-card h3 { font-size: 1.2rem; font-weight: 700; color: var(--navy); margin-bottom: 10px; }
.blog-card h3 a:hover { color: var(--gold); }
.blog-card p { font-size: 0.95rem; color: var(--muted); line-height: 1.65; margin-bottom: 16px; }
.blog-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  background: rgba(26,54,87,0.08);
  color: var(--navy);
  margin-right: 6px;
}

/* ── ISBN badge ──────────────────────────────────────────── */
.isbn-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255,255,255,0.10);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 6px;
  padding: 8px 14px;
  font-size: 0.88rem;
  color: rgba(255,255,255,0.8);
}
.isbn-badge strong { color: var(--white); font-size: 0.92rem; }

/* ── Footer ──────────────────────────────────────────────── */
.footer {
  background: var(--navy-d);
  color: rgba(255,255,255,0.65);
  padding: 48px 0 32px;
}
.footer__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
}
.footer__brand { font-weight: 700; font-size: 1.05rem; color: var(--white); margin-bottom: 10px; }
.footer__brand span { color: var(--gold); }
.footer__tagline { font-size: 0.88rem; line-height: 1.6; margin-bottom: 16px; }
.footer__isbn { font-size: 0.8rem; margin-top: 8px; }
.footer__isbn strong { color: rgba(255,255,255,0.85); }
.footer h5 { font-size: 0.78rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: rgba(255,255,255,0.45); margin-bottom: 14px; }
.footer ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.footer ul a { color: rgba(255,255,255,0.65); font-size: 0.9rem; transition: color 0.15s; }
.footer ul a:hover { color: var(--white); }
.footer__bottom {
  max-width: var(--max);
  margin: 32px auto 0;
  padding: 20px var(--gutter) 0;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.82rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

/* ── Utilities ───────────────────────────────────────────── */
.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  background: rgba(26,54,87,0.08);
  color: var(--navy);
}
.badge-new {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  background: #16A34A;
  color: #fff;
  vertical-align: middle;
  margin-left: 8px;
}
.divider { border: none; border-top: 1px solid var(--border); margin: 0; }

/* ── Breadcrumb ──────────────────────────────────────────── */
.breadcrumb { font-size: 0.85rem; color: var(--muted); padding: 16px 0; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--navy); }
.breadcrumb span { margin: 0 8px; }

/* ── Page hero (inner pages) ─────────────────────────────── */
.page-hero {
  background: var(--navy);
  color: var(--white);
  padding: 52px 0 44px;
}
.page-hero h1 { font-size: clamp(1.8rem, 3.5vw, 2.5rem); font-weight: 800; letter-spacing: -0.02em; margin-bottom: 10px; }
.page-hero p { font-size: 1.05rem; color: rgba(255,255,255,0.72); max-width: 520px; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 768px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__cover { max-width: 220px; margin: 0 auto; }
  .hero__cover img { transform: none; }
  .footer__inner { grid-template-columns: 1fr; gap: 28px; }
  .author-grid { grid-template-columns: 1fr; }
  .author-avatar { margin: 0 auto; }
  .nav__links { display: none; }
}

@media (max-width: 480px) {
  .section { padding: 52px 0; }
  .hero { padding: 52px 0; }
  .parts-grid { grid-template-columns: 1fr; }
  .resource-grid { grid-template-columns: 1fr; }
}