/* ============================================================
   base.css — shared across all pages
   ============================================================ */

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

/* ── CSS VARIABLES ── */
:root {
  --bg: #ffffff;
  --bg2: #f6f6f4;
  --bg3: #efefed;
  --ink: #111111;
  --ink2: #444440;
  --ink3: #737370;
  --line: rgba(17,17,17,0.1);
  --line2: rgba(17,17,17,0.16);
  --accent: #1a9c5b;
  --accent-soft: rgba(26,156,91,0.09);
  --accent-border: rgba(26,156,91,0.22);
  --card: #ffffff;
  --card-border: rgba(17,17,17,0.1);
  --sh1: 0 1px 3px rgba(0,0,0,0.06), 0 4px 16px rgba(0,0,0,0.05);
  --sh2: 0 2px 8px rgba(0,0,0,0.08), 0 16px 40px rgba(0,0,0,0.07);
  --sh3: 0 4px 16px rgba(0,0,0,0.1), 0 28px 64px rgba(0,0,0,0.08);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --chrome-bg: #f0f0ee;
  --chrome-text: #888882;
  --feat-title-color: #111111;
  --feat-meta-color: #666660;
  --prog-bg: #e0e0de;
}

[data-theme="dark"] {
  --bg: #0e0e0e;
  --bg2: #161616;
  --bg3: #1e1e1e;
  --ink: #f0f0ee;
  --ink2: #a0a09a;
  --ink3: #818178;
  --line: rgba(240,240,238,0.07);
  --line2: rgba(240,240,238,0.13);
  --accent: #22c46e;
  --accent-soft: rgba(34,196,110,0.1);
  --accent-border: rgba(34,196,110,0.22);
  --card: #161616;
  --card-border: rgba(240,240,238,0.1);
  --sh1: 0 1px 3px rgba(0,0,0,0.3), 0 4px 16px rgba(0,0,0,0.2);
  --sh2: 0 2px 8px rgba(0,0,0,0.4), 0 16px 40px rgba(0,0,0,0.3);
  --sh3: 0 4px 16px rgba(0,0,0,0.5), 0 28px 64px rgba(0,0,0,0.4);
  --chrome-bg: #1e1e1e;
  --chrome-text: #555550;
  --feat-title-color: #f0f0ee;
  --feat-meta-color: #999993;
  --prog-bg: #252525;
}

/* ── BASE ── */
html { scroll-behavior: smooth; }

body {
  font-family: 'Jost', sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s, color 0.3s;
}


/* ── CONTENT LINK WRAPPERS — reset browser default <a> styles ── */
.art-card,
.art-card *,
.article-row,
.article-row .row-title,
.article-row .row-exc,
.article-row .row-date,
.article-row .row-readtime,
.related-card,
.related-card *,
.mini-item,
.mini-item *,
.proj-card,
.proj-card *,
.feat-article,
.feat-article * {
  text-decoration: none;
}

.art-card,
.article-row,
.related-card,
.mini-item,
.feat-article {
  color: inherit;
}


/* ── LANGUAGE DROPDOWN ── */
.lang-select-wrap { position: static; }

.lang-dropdown {
  display: none;
  position: fixed;  /* fixed instead of absolute to escape nav stacking context */
  background: var(--card);
  border: 1px solid var(--line2);
  border-radius: 10px;
  box-shadow: var(--sh2);
  overflow: hidden;
  z-index: 200;
  min-width: 148px;
}
.lang-dropdown.open { display: block; }

.lang-option {
  display: block;
  width: 100%;
  padding: 0.65rem 1rem;
  text-align: left;
  font-family: 'Jost', sans-serif;
  font-size: 12px;
  font-weight: 400;
  color: var(--ink2);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--line);
}
.lang-option:last-child { border-bottom: none; }
.lang-option:hover { background: var(--bg2); color: var(--ink); }
.lang-option.active { color: var(--accent); font-weight: 600; background: var(--accent-soft); }

/* lang-toggle gets a chevron indicator */
.lang-toggle {
  height: 36px;
  padding: 0 0.65rem;
  border-radius: 100px;
  background: var(--bg3);
  border: 1px solid var(--line2);
  cursor: pointer;
  font-family: 'Jost', sans-serif;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink2);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 4px;
}
.lang-toggle:hover { background: var(--bg2); color: var(--ink); }
.lang-toggle::after {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 3.5px solid transparent;
  border-right: 3.5px solid transparent;
  border-top: 4px solid currentColor;
  opacity: 0.6;
  transition: transform 0.2s;
}
.lang-select-wrap.open .lang-toggle::after { transform: rotate(180deg); }

/* ── NAV ── */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2.5rem;
  height: 62px;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 50;
  transition: background 0.3s, border-color 0.3s;
}

.nav-logo {
  font-family: 'Playfair Display', serif;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  flex-shrink: 0;
  text-decoration: none;
}
.nav-logo span { color: var(--accent); }

.nav-center {
  display: flex;
  gap: 2rem;
  list-style: none;
}
.nav-center a {
  font-size: 13px;
  font-weight: 400;
  color: var(--ink2);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color 0.2s;
}
.nav-center a:hover { color: var(--ink); }
.nav-center a.active { color: var(--ink); font-weight: 500; }

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg3);
  border: 1px solid var(--line2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  transition: var(--transition);
  color: var(--ink2);
  line-height: 1;
}
.theme-toggle:hover { background: var(--bg2); color: var(--ink); }

.nav-cta {
  background: var(--ink);
  color: var(--bg);
  font-family: 'Jost', sans-serif;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.05em;
  border: none;
  padding: 0.5rem 1.15rem;
  border-radius: 100px;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}
.nav-cta:hover { background: var(--accent); }

/* ── HAMBURGER ── */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 4px;
  border-radius: 8px;
  transition: var(--transition);
}
.hamburger:hover { background: var(--bg3); }
.hamburger span {
  display: block;
  width: 20px;
  height: 0;
  border-top: 2px solid var(--ink);
  border-radius: 2px;
  transition: var(--transition);
}

/* ── MOBILE MENU ── */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  right: 0;
  width: min(320px, 85vw);
  height: 100vh;
  background: var(--bg);
  border-left: 1px solid var(--line2);
  z-index: 200;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: -8px 0 40px rgba(0,0,0,0.12);
}
.mobile-menu.open { transform: translateX(0); }

.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 199;
  opacity: 0;
  transition: opacity 0.3s ease;
  backdrop-filter: blur(2px);
}
.mobile-overlay.open { opacity: 1; }

.mobile-menu-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 1.5rem;
  height: 62px;
  border-bottom: 1px solid var(--line);
  flex-shrink: 0;
}

.mobile-close {
  background: var(--bg3);
  border: 1px solid var(--line2);
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 13px;
  color: var(--ink2);
  transition: var(--transition);
}
.mobile-close:hover { background: var(--bg2); color: var(--ink); }

.mobile-links { list-style: none; padding: 1.5rem 0; flex: 1; }
.mobile-links li { border-bottom: 1px solid var(--line); }
.mobile-links a {
  display: block;
  padding: 1.1rem 1.5rem;
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color 0.2s, background 0.2s;
}
.mobile-links a:hover { color: var(--accent); background: var(--accent-soft); }

.mobile-menu-footer {
  padding: 1.5rem;
  border-top: 1px solid var(--line);
  flex-shrink: 0;
}

/* ── SHARED BUTTONS ── */
.btn-primary {
  background: var(--ink);
  color: var(--bg);
  font-family: 'Jost', sans-serif;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  border: none;
  padding: 0.8rem 1.75rem;
  border-radius: 100px;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  text-decoration: none;
  display: inline-block;
}
.btn-primary:hover { background: var(--accent); transform: translateY(-2px); }

.btn-ghost {
  background: transparent;
  color: var(--ink2);
  font-family: 'Jost', sans-serif;
  font-size: 13px;
  border: 1px solid var(--line2);
  padding: 0.8rem 1.75rem;
  border-radius: 100px;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
}
.btn-ghost:hover { color: var(--ink); border-color: var(--ink3); }

/* ── FOOTER ── */
footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--line);
  flex-wrap: wrap;
  gap: 1rem;
}
.foot-left {
  font-family: 'Playfair Display', serif;
  font-size: 0.95rem;
  font-style: italic;
  color: var(--ink3);
}
.foot-links { display: flex; gap: 1.5rem; list-style: none; flex-wrap: wrap; }
.foot-links a {
  font-size: 13px;
  color: var(--ink3);
  text-decoration: none;
  transition: color 0.2s;
}
.foot-links a:hover { color: var(--ink); }

/* ── SCROLL REVEAL ── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s cubic-bezier(0.4,0,0.2,1), transform 0.55s cubic-bezier(0.4,0,0.2,1);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }

/* ── RESPONSIVE NAV ── */
@media (max-width: 900px) {
  nav { padding: 0 1.5rem; }
  footer { padding: 2rem 1.5rem; }
}

@media (max-width: 600px) {
  nav { padding: 0 1rem; height: 56px; }
  .nav-center { display: none; }
  .nav-cta { display: none; }
  .hamburger { display: flex; }
  .mobile-menu { display: flex; }
  footer { padding: 2rem 1rem; flex-direction: column; align-items: flex-start; }
  .foot-links { gap: 1rem; }
}

/* ── PAGINATION ── */
.pagination {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 2.5rem 4rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.pagination-inner {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.page-btn {
  font-size: 13px;
  font-weight: 500;
  color: var(--ink2);
  text-decoration: none;
  padding: 0.55rem 1.1rem;
  border: 1px solid var(--line2);
  border-radius: 100px;
  transition: var(--transition);
  background: var(--card);
  white-space: nowrap;
}
.page-btn:hover { color: var(--ink); border-color: var(--ink3); }
.page-btn--disabled { opacity: 0.35; cursor: default; pointer-events: none; }

.page-numbers { display: flex; gap: 0.25rem; align-items: center; }

.page-num {
  font-size: 13px;
  color: var(--ink2);
  text-decoration: none;
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  transition: var(--transition);
}
.page-num:hover { background: var(--bg2); color: var(--ink); }
.page-num--active {
  background: var(--ink);
  color: var(--bg);
  font-weight: 500;
  pointer-events: none;
}
[data-theme="dark"] .page-num--active { background: var(--accent); color: #0e0e0e; }

.pagination-info {
  font-size: 12px;
  color: var(--ink3);
  letter-spacing: 0.04em;
}

/* ── PREV / NEXT POST NAV ── */
.post-nav {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2.5rem 4rem;
}

.post-nav-inner {
  max-width: 680px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
}

.post-nav-item {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.75rem 0;
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
  border-bottom: 1px solid var(--line);
}
.post-nav-prev { padding-right: 2rem; border-right: 1px solid var(--line); }
.post-nav-next { padding-left: 2rem; justify-content: flex-end; }

.post-nav-item:hover .post-nav-title { color: var(--accent); }
.post-nav-item:hover .post-nav-arrow { color: var(--accent); }

.post-nav-arrow {
  font-size: 1.5rem;
  color: var(--ink3);
  flex-shrink: 0;
  transition: color 0.2s, transform 0.2s;
  line-height: 1;
}
.post-nav-prev:hover .post-nav-arrow { transform: translateX(-3px); }
.post-nav-next:hover .post-nav-arrow { transform: translateX(3px); }

.post-nav-body {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.post-nav-next .post-nav-body { text-align: right; }

.post-nav-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink3);
}

.post-nav-title {
  font-family: 'Playfair Display', serif;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
  transition: color 0.2s;
}

@media (max-width: 900px) {
  .post-nav { padding: 0 1.5rem 3rem; }
  .post-nav-inner { max-width: 100%; }
}
@media (max-width: 600px) {
  .post-nav { padding: 0 1rem 2rem; }
  .post-nav-inner { grid-template-columns: 1fr; }
  .post-nav-prev { padding-right: 0; border-right: none; }
  .post-nav-next { padding-left: 0; justify-content: flex-start; }
  .post-nav-next .post-nav-body { text-align: left; }
  .post-nav-item { padding: 1.25rem 0; }
}

/* ── PRINT STYLES ── */
@media print {
  nav, .mobile-menu, .mobile-overlay, .theme-toggle,
  .lang-toggle, .nav-cta, .hamburger, footer,
  .toc, #progress-bar, .art-share, .author-box,
  .related-section, .post-nav, .art-tags { display: none !important; }

  body { font-size: 12pt; color: #000; background: #fff; }

  .art-body { max-width: 100%; }
  .art-body h2 { font-size: 16pt; margin-top: 1.5em; }
  .art-body p { line-height: 1.6; }
  .art-body a::after { content: " (" attr(href) ")"; font-size: 10pt; color: #666; }
  .art-body pre { border: 1px solid #ccc; padding: 0.75em; white-space: pre-wrap; }
  .art-body code { background: #f5f5f5; }

  .article-header { padding: 1em 0; }
  .art-header-title { font-size: 24pt; }
  .art-cover { display: none; }

  a { color: #000; }
  h1, h2, h3 { page-break-after: avoid; }
  p, li { page-break-inside: avoid; }
}

/* ── ERROR PAGE ── */
.error-page {
  max-width: 600px;
  margin: 8rem auto;
  padding: 0 2.5rem;
  text-align: center;
}
.error-code {
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
}
.error-title {
  font-family: 'Playfair Display', serif;
  font-size: 2.5rem;
  font-weight: 400;
  letter-spacing: -.03em;
  margin-bottom: 1rem;
}
.error-desc {
  color: var(--ink2);
  line-height: 1.8;
  margin-bottom: 2.5rem;
}

/* btn full width variant */
.btn-primary--full { text-align: center; width: 100%; display: block; }