/*
Theme Name: Get To Know Claude
Theme URI: https://GetToKnowClaude.com
Author: Parmod K. Gandhi
Author URI: https://GetToKnowClaude.com
Description: Official theme for GetToKnowClaude.com — companion site to the book "Get to Know Claude: Your AI Thinking Partner"
Version: 1.0
License: GNU General Public License v2 or later
Text Domain: gtkc
*/

/* ============================================================
   CSS VARIABLES
   ============================================================ */
:root {
  --ink:        #1a1a2e;
  --ink-light:  #3d3d5c;
  --paper:      #faf9f6;
  --paper-warm: #f2efe8;
  --accent:     #c8590a;
  --accent-light: #e8753a;
  --accent-pale: #fdf0e8;
  --teal:       #0d7c7c;
  --teal-light: #e6f4f4;
  --gold:       #b8860b;
  --border:     #e0dbd0;
  --shadow:     rgba(26,26,46,0.08);
  --shadow-md:  rgba(26,26,46,0.15);

  --font-display: 'Playfair Display', Georgia, serif;
  --font-body:    'Source Serif 4', Georgia, serif;
  --font-ui:      'DM Sans', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', monospace;

  --radius:   6px;
  --radius-lg: 14px;
  --max-w:    1160px;
  --max-w-text: 720px;
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 17px; }

body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1,h2,h3,h4,h5,h6 {
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.25;
  font-weight: 700;
}

p { margin-bottom: 1.2em; }
p:last-child { margin-bottom: 0; }

/* ============================================================
   LAYOUT UTILITIES
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.container--text {
  max-width: var(--max-w-text);
}

.section {
  padding: 72px 0;
}

.section--alt {
  background: var(--paper-warm);
}

/* ============================================================
   SITE HEADER
   ============================================================ */
.site-header {
  background: var(--ink);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px var(--shadow-md);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.site-logo {
  display: flex;
  flex-direction: column;
  text-decoration: none;
}

.site-logo__name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.site-logo__sub {
  font-family: var(--font-ui);
  font-size: 0.68rem;
  color: var(--accent-light);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a {
  font-family: var(--font-ui);
  font-size: 0.88rem;
  font-weight: 500;
  color: rgba(255,255,255,0.82);
  padding: 6px 14px;
  border-radius: var(--radius);
  transition: background 0.18s, color 0.18s;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a.current {
  background: rgba(255,255,255,0.1);
  color: #fff;
}

.site-nav .btn-nav {
  background: var(--accent);
  color: #fff;
  padding: 7px 18px;
  border-radius: 99px;
  margin-left: 8px;
}

.site-nav .btn-nav:hover {
  background: var(--accent-light);
}

.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: #fff;
}

/* ============================================================
   HERO — HOME
   ============================================================ */
.hero {
  background: var(--ink);
  padding: 80px 0 72px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 80% at 80% 50%, rgba(200,89,10,0.18) 0%, transparent 70%),
    radial-gradient(ellipse 40% 60% at 10% 80%, rgba(13,124,124,0.12) 0%, transparent 60%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 56px;
  align-items: center;
}

.hero__eyebrow {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 16px;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  color: #fff;
  line-height: 1.1;
  margin-bottom: 12px;
}

.hero__subtitle {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--accent-light);
  font-style: italic;
  margin-bottom: 20px;
  font-weight: 400;
}

.hero__tagline {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.45);
  margin-bottom: 28px;
}

.hero__desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.78);
  max-width: 520px;
  margin-bottom: 36px;
  line-height: 1.8;
}

.hero__actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 13px 26px;
  border-radius: 99px;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
  text-decoration: none;
  border: none;
}

.btn:hover { transform: translateY(-1px); text-decoration: none; }

.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 18px rgba(200,89,10,0.35);
}
.btn--primary:hover { background: var(--accent-light); box-shadow: 0 6px 24px rgba(200,89,10,0.45); }

.btn--outline {
  background: transparent;
  color: rgba(255,255,255,0.85);
  border: 1.5px solid rgba(255,255,255,0.3);
}
.btn--outline:hover { border-color: rgba(255,255,255,0.7); color: #fff; }

.btn--teal {
  background: var(--teal);
  color: #fff;
}
.btn--teal:hover { background: #0a9090; }

.hero__book-cover {
  position: relative;
}

.hero__book-cover img,
.hero__book-placeholder {
  border-radius: 8px;
  box-shadow: 12px 20px 60px rgba(0,0,0,0.5), -4px -4px 0 rgba(255,255,255,0.06);
  transform: rotate(-2deg);
  transition: transform 0.3s;
}

.hero__book-cover:hover img,
.hero__book-cover:hover .hero__book-placeholder {
  transform: rotate(0deg);
}

.hero__book-placeholder {
  width: 280px;
  height: 380px;
  background: linear-gradient(145deg, #2a2a4a 0%, #1a1a2e 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 32px;
  text-align: center;
  border: 1px solid rgba(255,255,255,0.1);
}

.hero__book-placeholder .book-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: #fff;
  line-height: 1.3;
}

.hero__book-placeholder .book-subtitle {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.hero__book-placeholder .book-author {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: rgba(255,255,255,0.55);
  margin-top: 12px;
}

/* ============================================================
   SECTION HEADINGS
   ============================================================ */
.section-heading {
  text-align: center;
  margin-bottom: 48px;
}

.section-heading__label {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}

.section-heading__title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  color: var(--ink);
}

.section-heading__desc {
  font-size: 1.05rem;
  color: var(--ink-light);
  max-width: 560px;
  margin: 12px auto 0;
  line-height: 1.7;
}

/* ============================================================
   ARTICLE CARDS
   ============================================================ */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.article-card {
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px var(--shadow);
}

.article-card__body {
  padding: 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-card__tag {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--teal);
  background: var(--teal-light);
  padding: 3px 10px;
  border-radius: 99px;
  margin-bottom: 14px;
}

.article-card__title {
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: var(--ink);
  line-height: 1.35;
}

.article-card__title a {
  color: inherit;
}
.article-card__title a:hover { color: var(--accent); text-decoration: none; }

.article-card__excerpt {
  font-size: 0.93rem;
  color: var(--ink-light);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 20px;
}

.article-card__meta {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: #999;
  display: flex;
  align-items: center;
  gap: 14px;
}

.article-card__read-more {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ============================================================
   CHAPTERS GRID (home teaser)
   ============================================================ */
.chapters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.chapter-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.chapter-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px var(--shadow);
}

.chapter-card__num {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}

.chapter-card__title {
  font-size: 1rem;
  color: var(--ink);
  line-height: 1.35;
}

/* ============================================================
   EMAIL SIGNUP
   ============================================================ */
.signup-band {
  background: var(--ink);
  padding: 64px 0;
  position: relative;
  overflow: hidden;
}

.signup-band::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 50% 100% at 100% 50%, rgba(200,89,10,0.15) 0%, transparent 70%);
}

.signup-band__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.signup-band__heading {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: #fff;
  margin-bottom: 12px;
}

.signup-band__desc {
  color: rgba(255,255,255,0.7);
  font-size: 0.97rem;
  line-height: 1.75;
}

.signup-form {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.signup-form label {
  display: block;
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 600;
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.signup-form input[type="text"],
.signup-form input[type="email"] {
  width: 100%;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: var(--radius);
  padding: 11px 14px;
  color: #fff;
  font-family: var(--font-body);
  font-size: 0.95rem;
  margin-bottom: 16px;
  transition: border-color 0.2s;
}

.signup-form input:focus {
  outline: none;
  border-color: var(--accent-light);
}

.signup-form input::placeholder { color: rgba(255,255,255,0.3); }

.signup-form__checkboxes {
  margin-bottom: 20px;
}

.signup-form__checkboxes p {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: rgba(255,255,255,0.5);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.signup-form__check {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  cursor: pointer;
}

.signup-form__check input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}

.signup-form__check span {
  font-family: var(--font-ui);
  font-size: 0.88rem;
  color: rgba(255,255,255,0.75);
}

.signup-form .btn {
  width: 100%;
  justify-content: center;
}

/* ============================================================
   ERRATA PAGE
   ============================================================ */
.errata-chapter {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 20px;
  overflow: hidden;
}

.errata-chapter__header {
  padding: 18px 24px;
  background: var(--paper-warm);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 14px;
}

.errata-chapter__num {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.errata-chapter__title {
  font-size: 1rem;
  color: var(--ink);
  font-weight: 600;
}

.errata-chapter__count {
  margin-left: auto;
  font-family: var(--font-ui);
  font-size: 0.75rem;
  background: var(--accent-pale);
  color: var(--accent);
  padding: 2px 10px;
  border-radius: 99px;
  font-weight: 600;
}

.errata-item {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
}

.errata-item:last-child { border-bottom: none; }

.errata-item__page {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: #999;
  white-space: nowrap;
  padding-top: 2px;
}

.errata-item__text { font-size: 0.93rem; color: var(--ink-light); }

.errata-item__original {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: #fff0f0;
  color: #c0392b;
  padding: 4px 10px;
  border-radius: var(--radius);
  display: inline-block;
  margin-bottom: 6px;
  text-decoration: line-through;
}

.errata-item__corrected {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: #f0fff4;
  color: #27ae60;
  padding: 4px 10px;
  border-radius: var(--radius);
  display: inline-block;
}

/* ============================================================
   COMING SOON — UPCOMING BOOKS
   ============================================================ */
.upcoming-books {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 32px;
}

.upcoming-book {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.upcoming-book__cover {
  background: linear-gradient(145deg, var(--paper-warm), var(--border));
  aspect-ratio: 3/4;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--ink-light);
  padding: 24px;
  text-align: center;
  max-height: 260px;
}

.upcoming-book__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.upcoming-book__body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.upcoming-book__badge {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gold);
  background: #fdf8e6;
  border: 1px solid #e8d68a;
  padding: 3px 10px;
  border-radius: 99px;
  margin-bottom: 12px;
}

.upcoming-book__title {
  font-size: 1.2rem;
  color: var(--ink);
  margin-bottom: 10px;
}

.upcoming-book__desc {
  font-size: 0.9rem;
  color: var(--ink-light);
  line-height: 1.7;
  flex: 1;
}

/* ============================================================
   ABOUT PAGE
   ============================================================ */
.about-hero {
  background: var(--ink);
  padding: 72px 0;
}

.about-hero__inner {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  align-items: start;
}

.about-hero__photo {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: var(--ink-light);
  border: 4px solid var(--accent);
  overflow: hidden;
  flex-shrink: 0;
}

.about-hero__name {
  font-size: 2.4rem;
  color: #fff;
  margin-bottom: 6px;
}

.about-hero__role {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.about-hero__bio-intro {
  color: rgba(255,255,255,0.75);
  font-size: 1.05rem;
  line-height: 1.8;
  max-width: 560px;
}

/* ============================================================
   PROSE CONTENT (Articles, Privacy Policy, About)
   ============================================================ */
.prose {
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--ink);
}

.prose h2 {
  font-size: 1.7rem;
  margin: 2.2em 0 0.7em;
  color: var(--ink);
}

.prose h3 {
  font-size: 1.25rem;
  margin: 1.8em 0 0.5em;
  color: var(--ink-light);
}

.prose p { margin-bottom: 1.4em; }

.prose ul, .prose ol {
  padding-left: 1.6em;
  margin-bottom: 1.4em;
}

.prose li { margin-bottom: 0.4em; }

.prose blockquote {
  border-left: 4px solid var(--accent);
  padding: 16px 24px;
  margin: 1.8em 0;
  background: var(--accent-pale);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
  color: var(--ink-light);
}

.prose strong { color: var(--ink); font-weight: 700; }

.prose a { color: var(--accent); }

/* ============================================================
   SINGLE ARTICLE
   ============================================================ */
.article-header {
  background: var(--ink);
  padding: 64px 0 56px;
}

.article-header__tag {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 14px;
}

.article-header__title {
  font-size: clamp(1.8rem, 4vw, 3rem);
  color: #fff;
  max-width: var(--max-w-text);
  margin-bottom: 16px;
}

.article-header__meta {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
}

.article-body {
  padding: 60px 0 80px;
}

/* ============================================================
   SITE FOOTER
   ============================================================ */
.site-footer {
  background: var(--ink);
  color: rgba(255,255,255,0.6);
  padding: 56px 0 28px;
  font-family: var(--font-ui);
  font-size: 0.88rem;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.site-footer__brand .site-logo__name {
  font-size: 1.1rem;
  margin-bottom: 10px;
  display: block;
}

.site-footer__brand p {
  line-height: 1.7;
  font-size: 0.85rem;
  max-width: 280px;
}

.site-footer__col h4 {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.35);
  margin-bottom: 14px;
}

.site-footer__col ul { list-style: none; }

.site-footer__col ul li { margin-bottom: 8px; }

.site-footer__col ul li a {
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  transition: color 0.15s;
}

.site-footer__col ul li a:hover { color: #fff; }

.site-footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.site-footer__copy {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.35);
}

.site-footer__legal {
  display: flex;
  gap: 20px;
}

.site-footer__legal a {
  color: rgba(255,255,255,0.4);
  font-size: 0.8rem;
  text-decoration: none;
  transition: color 0.15s;
}

.site-footer__legal a:hover { color: rgba(255,255,255,0.8); }

/* ============================================================
   NOTICE BOXES
   ============================================================ */
.notice {
  padding: 18px 22px;
  border-radius: var(--radius);
  margin-bottom: 1.6em;
  font-size: 0.93rem;
  line-height: 1.7;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.notice--info {
  background: var(--teal-light);
  border-left: 4px solid var(--teal);
  color: #0a4a4a;
}

.notice--warning {
  background: #fff8e6;
  border-left: 4px solid var(--gold);
  color: #5a4000;
}

/* ============================================================
   PAGE HERO (inner pages)
   ============================================================ */
.page-hero {
  background: var(--ink);
  padding: 56px 0 48px;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 40% 80% at 100% 50%, rgba(200,89,10,0.12) 0%, transparent 70%);
}

.page-hero__label {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 10px;
  position: relative;
}

.page-hero__title {
  font-size: clamp(2rem, 4vw, 3rem);
  color: #fff;
  position: relative;
  margin-bottom: 12px;
}

.page-hero__desc {
  color: rgba(255,255,255,0.65);
  font-size: 1rem;
  max-width: 560px;
  position: relative;
}

/* ============================================================
   MESSAGES (form feedback)
   ============================================================ */
.form-message {
  padding: 14px 18px;
  border-radius: var(--radius);
  font-family: var(--font-ui);
  font-size: 0.88rem;
  margin-top: 12px;
  display: none;
}

.form-message--success {
  background: #eafaf1;
  color: #1e7e4a;
  border: 1px solid #a9dfbf;
}

.form-message--error {
  background: #fdedec;
  color: #c0392b;
  border: 1px solid #f5b7b1;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__book-cover { display: none; }
  .signup-band__inner { grid-template-columns: 1fr; }
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
  .about-hero__inner { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .site-nav { display: none; }
  .site-nav.open { display: flex; flex-direction: column; position: absolute; top: 68px; left: 0; right: 0; background: var(--ink); padding: 16px; gap: 4px; }
  .hamburger { display: flex; }
  .site-footer__grid { grid-template-columns: 1fr; gap: 32px; }
  .section { padding: 48px 0; }
  .hero { padding: 48px 0; }
}