/* =============================================
   THOMAS STRACKE — Design Tokens + Styles
   Art direction: dark literary noir
   Palette: near-black / warm off-white / deep crimson accent
   Typography: Cormorant Garamond (display) + Work Sans (body)
   ============================================= */

/* === FONTS === */
@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,600;0,700;1,300;1,400;1,600&family=Work+Sans:wght@300;400;500;600&display=swap');

/* === TYPE SCALE === */
:root {
  --text-xs:   clamp(0.75rem,  0.7rem + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem + 0.75vw,   1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem + 4vw,      5rem);
  --text-hero: clamp(3.5rem,   1rem + 7vw,      8rem);

  /* === SPACING === */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* === CONTENT WIDTHS === */
  --content-narrow:  640px;
  --content-default: 960px;
  --content-wide:    1200px;

  /* === RADIUS === */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;

  /* === TRANSITION === */
  --transition-interactive: 220ms cubic-bezier(0.16, 1, 0.3, 1);

  /* === FONTS === */
  --font-display: 'Cormorant Garamond', 'Georgia', serif;
  --font-body:    'Work Sans', 'Helvetica Neue', sans-serif;
}

/* === DARK MODE (default — site is dark) === */
:root, [data-theme='dark'] {
  --color-bg:              #0e0d0c;
  --color-surface:         #131211;
  --color-surface-2:       #181715;
  --color-surface-offset:  #1d1c1a;
  --color-border:          #2a2926;
  --color-divider:         #222120;
  --color-text:            #e8e3db;
  --color-text-muted:      #8a8680;
  --color-text-faint:      #504e4a;
  --color-text-inverse:    #0e0d0c;
  --color-primary:         #a0312a;
  --color-primary-hover:   #c23c34;
  --color-primary-active:  #d94f46;
  --color-primary-highlight: #2e1514;

  --shadow-sm: 0 1px 3px oklch(0 0 0 / 0.4);
  --shadow-md: 0 4px 16px oklch(0 0 0 / 0.5);
  --shadow-lg: 0 12px 40px oklch(0 0 0 / 0.6);
}

/* === LIGHT MODE === */
[data-theme='light'] {
  --color-bg:              #f5f2ed;
  --color-surface:         #f9f7f3;
  --color-surface-2:       #fdfcfa;
  --color-surface-offset:  #edeae4;
  --color-border:          #d8d4cc;
  --color-divider:         #e2dfd8;
  --color-text:            #1a1916;
  --color-text-muted:      #706e69;
  --color-text-faint:      #b0ada8;
  --color-text-inverse:    #f5f2ed;
  --color-primary:         #8b2520;
  --color-primary-hover:   #a02d28;
  --color-primary-active:  #b93830;
  --color-primary-highlight: #f0ddd9;

  --shadow-sm: 0 1px 3px oklch(0.2 0.01 60 / 0.08);
  --shadow-md: 0 4px 16px oklch(0.2 0.01 60 / 0.1);
  --shadow-lg: 0 12px 40px oklch(0.2 0.01 60 / 0.14);
}

/* =============================================
   LAYOUT UTILITIES
   ============================================= */
.container {
  width: 100%;
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: clamp(var(--space-6), 5vw, var(--space-16));
}

.container--wide {
  max-width: var(--content-wide);
}

.container--narrow {
  max-width: var(--content-narrow);
}

section {
  padding-block: clamp(var(--space-16), 8vw, var(--space-32));
}

/* =============================================
   NAVIGATION
   ============================================= */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-6), 5vw, var(--space-16));
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.nav-logo-mark {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.nav-logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.nav-links a {
  font-size: var(--text-sm);
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--color-text-muted);
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-links a.active {
  color: var(--color-text);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  background: transparent;
}

.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

.btn-nav {
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  padding: var(--space-2) var(--space-5);
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  border-radius: var(--radius-sm);
}

.btn-nav:hover {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

/* Mobile nav */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  cursor: pointer;
  background: none;
  border: none;
  padding: var(--space-2);
}

.nav-hamburger span {
  display: block;
  height: 1.5px;
  background: var(--color-text);
  border-radius: 1px;
  transition: all var(--transition-interactive);
}

.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  padding: var(--space-6) clamp(var(--space-6), 5vw, var(--space-16));
}

.mobile-menu.open { display: flex; }

.mobile-menu a {
  font-size: var(--text-base);
  font-weight: 400;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--color-text-muted);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-divider);
}

.mobile-menu a:last-child { border-bottom: none; }
.mobile-menu a:hover { color: var(--color-text); }

@media (max-width: 768px) {
  .nav-links, .btn-nav { display: none; }
  .nav-hamburger { display: flex; }
}

/* =============================================
   BUTTONS
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: #f0e8e0;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-ghost:hover {
  border-color: var(--color-text-muted);
  background: var(--color-surface-offset);
}

/* =============================================
   FOOTER
   ============================================= */
.site-footer {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-16);
  margin-top: var(--space-24);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-8);
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-6), 5vw, var(--space-16));
}

.footer-logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.footer-links {
  display: flex;
  gap: var(--space-8);
  flex-wrap: wrap;
  list-style: none;
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  letter-spacing: 0.04em;
}

.footer-links a:hover { color: var(--color-text); }

.footer-copy {
  width: 100%;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.04em;
  margin-top: var(--space-8);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
}

/* =============================================
   DIVIDERS & ORNAMENTS
   ============================================= */
.section-label {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-8);
}

.section-label::before {
  content: '';
  display: block;
  width: 2rem;
  height: 1px;
  background: var(--color-primary);
}

.rule {
  border: none;
  border-top: 1px solid var(--color-divider);
  margin-block: var(--space-16);
}

/* =============================================
   BOOK CARDS
   ============================================= */
.book-card {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: var(--space-10);
  align-items: start;
  padding: var(--space-10);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
}

.book-card:hover {
  border-color: var(--color-text-faint);
  background: var(--color-surface-2);
}

.book-cover {
  width: 100%;
  aspect-ratio: 2/3;
  object-fit: cover;
  border-radius: var(--radius-md);
  background: var(--color-surface-offset);
}

.book-cover-placeholder {
  width: 100%;
  aspect-ratio: 2/3;
  background: var(--color-surface-offset);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  gap: var(--space-3);
}

.book-cover-placeholder-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  text-align: center;
  padding: var(--space-4);
  line-height: 1.2;
}

.book-cover-placeholder-author {
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}

.book-meta { display: flex; flex-direction: column; gap: var(--space-4); }

.book-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1.1;
  color: var(--color-text);
}

.book-genre {
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.book-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-top: var(--space-2);
}

.book-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-top: var(--space-4);
}

.badge-coming-soon {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  border-radius: var(--radius-sm);
}

@media (max-width: 600px) {
  .book-card {
    grid-template-columns: 120px 1fr;
    gap: var(--space-6);
    padding: var(--space-6);
  }
}

/* =============================================
   NEWSLETTER BAND
   ============================================= */
.newsletter-band {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
}

.newsletter-inner {
  max-width: 640px;
  margin-inline: auto;
  padding-inline: clamp(var(--space-6), 5vw, var(--space-16));
  text-align: center;
}

.newsletter-inner h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  font-style: italic;
  margin-bottom: var(--space-4);
}

.newsletter-inner p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
  max-width: 52ch;
  margin-inline: auto;
}

.newsletter-form {
  display: flex;
  gap: var(--space-3);
  max-width: 460px;
  margin-inline: auto;
}

.newsletter-form input {
  flex: 1;
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-text);
  outline: none;
}

.newsletter-form input:focus {
  border-color: var(--color-primary);
}

.newsletter-form input::placeholder {
  color: var(--color-text-faint);
}

@media (max-width: 500px) {
  .newsletter-form { flex-direction: column; }
}

/* =============================================
   PAGE HERO (inner pages)
   ============================================= */
.page-hero {
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
  border-bottom: 1px solid var(--color-divider);
}

.page-hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 300;
  font-style: italic;
  line-height: 1;
  margin-bottom: var(--space-6);
}

.page-hero p {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 58ch;
  line-height: 1.6;
}

/* =============================================
   SCROLL REVEAL
   ============================================= */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
}