:root {
  --paper: #f6edd8;
  --paper-deep: #efe2c4;
  --ink: #1f3b63;          /* navy from the covers */
  --ink-soft: #3a5170;
  --accent: #c2533a;       /* warm terracotta */
  --accent-2: #2f7d6b;     /* muted teal */
  --gold: #d8a13a;
  --card: #fffaf0;
  --shadow: rgba(31, 59, 99, 0.18);
  --maxw: 1140px;
  --pencils: #c2533a, #d8a13a, #2f7d6b, #3a6ea5, #7a5aa3;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Nunito', system-ui, sans-serif;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at 20% 15%, rgba(216, 161, 58, 0.06), transparent 45%),
    radial-gradient(circle at 85% 80%, rgba(47, 125, 107, 0.06), transparent 40%);
  line-height: 1.6;
}

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---- Header ---- */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(246, 237, 216, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(31, 59, 99, 0.12);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; position: relative; }

/* Hamburger toggle (hidden on desktop) */
.nav-toggle {
  display: none;
  flex-direction: column; justify-content: center; gap: 5px;
  width: 42px; height: 42px; padding: 9px;
  background: none; border: none; cursor: pointer;
}
.nav-toggle-bar {
  display: block; width: 100%; height: 2.5px; border-radius: 2px;
  background: var(--ink); transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }
.brand { text-decoration: none; color: var(--ink); }
.brand-mark {
  font-family: 'Fraunces', serif;
  font-weight: 800;
  font-size: 1.6rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.brand-mark.small { font-size: 1.2rem; }
.site-nav { display: flex; align-items: center; gap: 28px; }
.site-nav a { white-space: nowrap; }
.site-nav a {
  text-decoration: none; color: var(--ink-soft); font-weight: 700; font-size: 0.98rem;
  transition: color 0.15s;
}
.site-nav a:hover { color: var(--accent); }
.lang-switch { display: flex; align-items: center; gap: 4px; color: var(--ink-soft); }
.lang-switch button {
  background: none; border: none; cursor: pointer; font: inherit; font-weight: 800;
  color: var(--ink-soft); padding: 2px 4px; opacity: 0.55; transition: opacity 0.15s, color 0.15s;
}
.lang-switch button.active { opacity: 1; color: var(--accent); }
.lang-switch button:hover { opacity: 1; }

/* ---- Hero ---- */
.hero { padding: 84px 0 64px; text-align: center; }
.hero-inner { max-width: 820px; margin: 0 auto; }
.hero-eyebrow {
  text-transform: uppercase; letter-spacing: 0.22em; font-weight: 800; font-size: 0.8rem;
  color: var(--accent); margin: 0 0 18px;
}
.hero-title {
  font-family: 'Fraunces', serif; font-weight: 800; font-size: clamp(2.2rem, 5.2vw, 3.7rem);
  line-height: 1.08; margin: 0 0 22px; letter-spacing: -0.015em;
}
.hero-sub { font-size: clamp(1.05rem, 2vw, 1.25rem); color: var(--ink-soft); margin: 0 auto 34px; max-width: 640px; }

.btn {
  display: inline-block; font-weight: 800; text-decoration: none; cursor: pointer;
  border-radius: 999px; transition: transform 0.12s ease, box-shadow 0.15s ease, background 0.15s;
}
.btn-primary {
  background: var(--ink); color: var(--paper); padding: 14px 32px; font-size: 1.05rem;
  box-shadow: 0 6px 18px var(--shadow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 24px var(--shadow); }

.pencil-bar {
  height: 6px; width: 220px; margin: 48px auto 0; border-radius: 999px;
  background: linear-gradient(90deg, var(--pencils));
}

/* ---- Collection ---- */
.collection, .about { scroll-margin-top: 84px; }
.collection { padding: 40px 0 80px; }
.section-title {
  font-family: 'Fraunces', serif; font-weight: 800; font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  text-align: center; margin: 0 0 8px;
}
.section-sub { text-align: center; color: var(--ink-soft); margin: 0 0 44px; }

.book-grid {
  display: grid; gap: 36px 28px;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
}
.book-card { display: flex; flex-direction: column; }
.book-cover {
  display: block; border-radius: 10px; overflow: hidden;
  box-shadow: 0 10px 28px var(--shadow);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  aspect-ratio: 900 / 1174; background: var(--paper-deep);
}
.book-cover:hover { transform: translateY(-6px) rotate(-0.6deg); box-shadow: 0 18px 40px var(--shadow); }
.book-cover img { width: 100%; height: 100%; object-fit: cover; display: block; }

.book-info { text-align: center; padding-top: 16px; }
.book-city {
  font-family: 'Fraunces', serif; font-weight: 700; font-size: 1.3rem; margin: 0 0 2px;
}
.book-country {
  font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--ink-soft); margin: 0 0 14px;
}
.btn-amazon {
  background: var(--accent); color: #fff; padding: 9px 22px; font-size: 0.92rem;
  box-shadow: 0 4px 12px rgba(194, 83, 58, 0.3);
}
.btn-amazon:hover { transform: translateY(-2px); background: #ad4731; }

/* ---- About ---- */
.about { padding: 64px 0 84px; }
.about-inner {
  max-width: 720px; margin: 0 auto; text-align: center;
  background: var(--card); border: 1px solid rgba(31, 59, 99, 0.1);
  border-radius: 16px; padding: 44px 40px;
  box-shadow: 0 8px 24px var(--shadow);
}
.about-inner p { font-size: 1.1rem; color: var(--ink-soft); margin: 14px 0 0; }

/* ---- Footer ---- */
.site-footer { border-top: 1px solid rgba(31, 59, 99, 0.12); padding: 28px 0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.footer-meta { color: var(--ink-soft); font-size: 0.9rem; }
.footer-credit { color: var(--ink-soft); font-size: 0.9rem; }
.footer-credit a { color: var(--accent); font-weight: 700; text-decoration: none; }
.footer-credit a:hover { text-decoration: underline; }

/* ---- Responsive ---- */
@media (max-width: 860px) {
  .site-nav { gap: 20px; }
  .hero { padding: 64px 0 48px; }
  .book-grid { grid-template-columns: repeat(3, 1fr); gap: 32px 22px; }
}

@media (max-width: 620px) {
  .container { padding: 0 18px; }
  .brand-mark { font-size: 1.45rem; }

  /* Hamburger menu */
  .header-inner { height: 60px; }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--paper);
    border-bottom: 1px solid rgba(31, 59, 99, 0.12);
    box-shadow: 0 12px 24px var(--shadow);
    padding: 6px 18px 14px;
    display: none;
  }
  .site-nav.open { display: flex; }
  .site-nav a {
    font-size: 1.05rem; padding: 12px 4px;
    border-bottom: 1px solid rgba(31, 59, 99, 0.08);
  }
  .lang-switch { padding: 12px 4px; font-size: 1.05rem; }

  .hero { padding: 44px 0 36px; }
  .hero-title { font-size: clamp(1.9rem, 8vw, 2.6rem); }
  .pencil-bar { margin-top: 36px; }

  .collection { padding: 28px 0 60px; }
  .section-sub { margin-bottom: 32px; }
  .book-grid { grid-template-columns: repeat(2, 1fr); gap: 26px 16px; }
  .book-city { font-size: 1.15rem; }

  .about { padding: 48px 0 60px; }
  .about-inner { padding: 32px 22px; border-radius: 14px; }
  .about-inner p { font-size: 1rem; }

  /* Footer stacks and centers */
  .footer-inner { flex-direction: column; justify-content: center; text-align: center; gap: 6px; }
}

@media (max-width: 380px) {
  .book-grid { gap: 22px 14px; }
  .btn-amazon { padding: 8px 16px; font-size: 0.86rem; }
}