/* =============================================================
   Berfu Ege Sobe — Author Site
   Aesthetic: Sharp & professional. Black, white, cobalt accent.
   ============================================================= */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,300;9..144,400;9..144,500;9..144,600&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --ink:        #0a0a0a;
  --ink-soft:   #3d3d3d;
  --ink-mute:   #8a8a8a;
  --paper:      #ffffff;
  --paper-alt:  #f5f5f3;
  --rule:       #e5e5e2;
  --rule-strong:#d0d0cc;
  --accent:     #1d3fbf;        /* cobalt */
  --accent-dark:#152e8a;
  --serif:      'Fraunces', Georgia, serif;
  --sans:       'Inter', system-ui, -apple-system, sans-serif;
  --max:        1200px;
  --max-text:   640px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  font-size: 16px;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------- Layout ---------- */
.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 2rem;
}

/* ---------- Header / Nav ---------- */
.site-header {
  padding: 1.5rem 0;
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.site-header.scrolled { border-bottom-color: var(--rule); }

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
}

.site-title {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
}

.site-title:hover { color: var(--accent); }

nav ul {
  list-style: none;
  display: flex;
  gap: 2.5rem;
  align-items: center;
}

nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color 0.15s;
  position: relative;
  padding: 0.25rem 0;
}

nav a:hover { color: var(--ink); }

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

nav a.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0; right: 0;
  height: 2px;
  background: var(--accent);
}

/* Dropdown */
.dropdown { position: relative; }

.dropdown > a::after {
  content: "";
  display: inline-block;
  width: 5px; height: 5px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translate(-2px, -2px);
  margin-left: 0.5rem;
  vertical-align: middle;
  opacity: 0.6;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: -1.25rem;
  background: var(--paper);
  border: 1px solid var(--rule-strong);
  padding: 0.4rem 0;
  min-width: 240px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 0.15s, transform 0.15s, visibility 0.15s;
  margin-top: 0.5rem;
  box-shadow: 0 12px 30px -10px rgba(0,0,0,0.1);
}

.dropdown:hover .dropdown-menu,
.dropdown:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu li { list-style: none; }

.dropdown-menu a {
  display: block;
  padding: 0.7rem 1.25rem;
  font-family: var(--sans);
  font-weight: 500;
  font-size: 0.85rem;
  color: var(--ink);
}

.dropdown-menu a:hover { background: var(--paper-alt); color: var(--accent); }

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--ink);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: currentColor;
  margin: 5px 0;
  transition: transform 0.3s, opacity 0.3s;
}

/* ---------- Hero / page intros ---------- */
.hero { padding: 5rem 0 4rem; }
.hero-narrow { padding: 4.5rem 0 3rem; }

.eyebrow {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
  font-weight: 600;
}

h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 18ch;
  font-variation-settings: "opsz" 144;
  margin-bottom: 1.5rem;
  color: var(--ink);
}

h1 em {
  font-style: italic;
  font-weight: 400;
  color: var(--accent);
}

.lede {
  font-family: var(--sans);
  font-size: clamp(1.05rem, 1.4vw, 1.2rem);
  font-weight: 400;
  line-height: 1.55;
  max-width: var(--max-text);
  color: var(--ink-soft);
}

/* ---------- Sections ---------- */
section { padding: 4rem 0; }

.section-label {
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
  font-weight: 600;
}

h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin-bottom: 1.25rem;
  font-variation-settings: "opsz" 144;
  color: var(--ink);
}

h3 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
  margin-bottom: 0.6rem;
  color: var(--ink);
}

p {
  margin-bottom: 1.15rem;
  max-width: var(--max-text);
  color: var(--ink-soft);
}

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

.prose p { font-size: 1rem; line-height: 1.75; }

.prose p strong { color: var(--ink); font-weight: 600; }

a.inline-link {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color 0.15s;
}

a.inline-link:hover { color: var(--accent-dark); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 0.85rem 1.75rem;
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  border: 1.5px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  transition: all 0.2s;
  cursor: pointer;
  text-align: center;
}

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

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

.btn-ghost:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

/* ---------- Home: hero with portrait ---------- */
.hero-split {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 5rem;
  align-items: center;
  padding: 5rem 0 4rem;
}

.hero-split h1 { max-width: 14ch; }

.hero-portrait {
  aspect-ratio: 4 / 5;
  background: var(--paper-alt);
  overflow: hidden;
  position: relative;
}

.hero-portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: grayscale(15%) contrast(1.02);
  transition: filter 0.4s;
}

.hero-portrait:hover img { filter: grayscale(0%) contrast(1.05); }

/* ---------- Home: featured book ---------- */
.featured {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 5rem;
  align-items: center;
  padding: 4rem 0;
  border-top: 1px solid var(--rule);
}

.book-cover {
  aspect-ratio: 2 / 3;
  max-width: 320px;
  background: linear-gradient(160deg, #181818 0%, #050505 100%);
  color: var(--paper);
  padding: 2.25rem 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow:
    0 1px 1px rgba(0,0,0,0.05),
    0 22px 44px -18px rgba(0,0,0,0.3),
    0 12px 24px -16px rgba(0,0,0,0.18);
  position: relative;
  transition: transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.book-cover:hover { transform: translateY(-4px); }

.book-cover::after {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  pointer-events: none;
}

.cover-eyebrow {
  font-family: var(--sans);
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  opacity: 0.55;
  font-weight: 600;
}

.cover-title {
  font-family: var(--serif);
  font-size: 1.7rem;
  line-height: 1.05;
  font-weight: 400;
  font-style: italic;
  letter-spacing: -0.01em;
}

.cover-author {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0.75;
  font-weight: 500;
}

.cover-divider {
  width: 24px;
  height: 1px;
  background: rgba(255, 255, 255, 0.35);
  margin: 0.9rem 0;
}

/* ---------- Books list ---------- */
.books-list { padding: 3rem 0; }

.book-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 2.5rem;
  align-items: center;
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  color: var(--ink);
  transition: padding 0.25s;
}

.book-row:first-child { border-top: 1px solid var(--rule); }

.book-row:hover { padding-left: 0.75rem; }

.book-row .book-cover {
  width: 90px;
  max-width: 90px;
  padding: 0.85rem 0.7rem;
}

.book-row .book-cover .cover-title { font-size: 0.8rem; }
.book-row .book-cover .cover-eyebrow,
.book-row .book-cover .cover-author { font-size: 0.45rem; }
.book-row .book-cover .cover-divider { width: 12px; margin: 0.35rem 0; }
.book-row .book-cover::after { inset: 5px; }

.book-row h3 {
  font-size: 1.35rem;
  margin-bottom: 0.4rem;
}

.book-row p {
  font-size: 0.92rem;
  margin-bottom: 0;
}

.book-row .arrow {
  font-family: var(--sans);
  font-size: 1.25rem;
  color: var(--ink-mute);
  transition: transform 0.25s, color 0.25s;
}

.book-row:hover .arrow {
  transform: translateX(6px);
  color: var(--accent);
}

/* ---------- Book detail page ---------- */
.book-detail {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 5rem;
  align-items: start;
  padding: 4rem 0;
}

.book-detail .book-cover { max-width: 340px; position: sticky; top: 6rem; }

.book-meta {
  display: flex;
  gap: 2.25rem;
  margin: 1.75rem 0 2rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  flex-wrap: wrap;
}

.book-meta dt {
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 0.3rem;
  font-weight: 600;
}

.book-meta dd {
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--ink);
  font-weight: 500;
}

.buy-links { margin-top: 2.25rem; }

.buy-links .section-label { margin-bottom: 0.85rem; }

.buy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.5rem;
  margin-top: 0.85rem;
}

.buy-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--rule-strong);
  text-decoration: none;
  color: var(--ink);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s;
}

.buy-link:hover {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--paper);
}

.buy-link .arrow {
  font-size: 1rem;
  opacity: 0.6;
}

.buy-link:hover .arrow { opacity: 1; }

/* ---------- About page ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 5rem;
  align-items: start;
  padding: 3rem 0 5rem;
}

.portrait {
  aspect-ratio: 4 / 5;
  background: var(--paper-alt);
  position: sticky;
  top: 6rem;
  overflow: hidden;
}

.portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: grayscale(15%) contrast(1.02);
}

.about-facts {
  margin-top: 2.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
}

.about-facts dt {
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 0.35rem;
  font-weight: 600;
}

.about-facts dd {
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--ink);
  font-weight: 400;
}

/* ---------- Footer ---------- */
footer {
  padding: 3.5rem 0 2.5rem;
  margin-top: 3rem;
  border-top: 1px solid var(--rule);
}

footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

footer .footer-title {
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink);
}

footer ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}

footer a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

footer a:hover { color: var(--accent); }

footer small {
  display: block;
  color: var(--ink-mute);
  font-size: 0.76rem;
  margin-top: 0.75rem;
  width: 100%;
}

/* ---------- Entrance animation ---------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hero .eyebrow,
.hero-split .eyebrow { animation: fadeUp 0.5s ease-out both; }
.hero h1, .hero-split h1 { animation: fadeUp 0.6s ease-out 0.08s both; }
.hero .lede, .hero-split .lede  { animation: fadeUp 0.6s ease-out 0.16s both; }
.hero .hero-cta, .hero-split .hero-cta { animation: fadeUp 0.6s ease-out 0.24s both; }
.hero-portrait { animation: fadeUp 0.7s ease-out 0.1s both; }

.hero-cta {
  margin-top: 2rem;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ---------- Responsive ---------- */
@media (max-width: 880px) {
  .container { padding: 0 1.5rem; }

  .nav-toggle { display: block; }

  nav ul {
    position: fixed;
    inset: 64px 0 0 0;
    background: var(--paper);
    flex-direction: column;
    gap: 0;
    align-items: stretch;
    padding: 1.5rem 1.5rem;
    transform: translateY(-100%);
    transition: transform 0.3s ease;
    border-top: 1px solid var(--rule);
  }

  nav.open ul { transform: translateY(0); }

  nav a {
    padding: 1rem 0;
    border-bottom: 1px solid var(--rule);
    font-size: 1rem;
    font-weight: 500;
  }

  nav a.active::after { display: none; }

  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    border: none;
    box-shadow: none;
    padding: 0 0 0 1.25rem;
    margin: 0;
    min-width: 0;
  }

  .dropdown > a::after { display: none; }

  .hero-split,
  .featured,
  .book-detail,
  .about-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    padding: 3rem 0;
  }

  .hero-portrait,
  .portrait,
  .book-detail .book-cover { position: static; max-width: 320px; }

  .book-row { grid-template-columns: 65px 1fr; gap: 1.25rem; padding: 1.75rem 0; }
  .book-row .arrow { display: none; }
  .book-row:hover { padding-left: 0; }

  .book-meta { gap: 1.25rem; }

  .hero { padding: 3rem 0 2.5rem; }

  footer .container { flex-direction: column; align-items: flex-start; gap: 1rem; }
}