/* ============================================================
   STEAMPUNK THEME — Dark by default, parchment light mode
   Built on PicoCSS semantic foundation
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;600;700&family=Jost:wght@300;400;500&family=Share+Tech+Mono&display=swap');

/* ── CSS Custom Properties ── */
:root,
[data-theme="dark"] {
  --bg:            #080604;
  --bg-surface:    #110e09;
  --bg-elevated:   #1a1208;
  --border:        #2a1f10;
  --border-bright: #4a3520;
  --copper:        #b87333;
  --gold:          #c9a84c;
  --gold-dim:      #8a6f2e;
  --text:          #d4b896;
  --text-muted:    #7a6048;
  --text-heading:  #e8c87a;
  --code-bg:       #0d0b07;
  --rivet:         #5a3e1b;

  /* Override PicoCSS tokens */
  --pico-background-color:       var(--bg);
  --pico-card-background-color:  var(--bg-surface);
  --pico-card-border-color:      var(--border);
  --pico-color:                  var(--text);
  --pico-h1-color:               var(--text-heading);
  --pico-h2-color:               var(--text-heading);
  --pico-h3-color:               var(--gold);
  --pico-primary:                var(--copper);
  --pico-primary-hover:          var(--gold);
  --pico-secondary-color:        var(--text-muted);
  --pico-border-color:           var(--border);
  --pico-muted-color:            var(--text-muted);
  --pico-muted-border-color:     var(--border);
  --pico-code-background-color:  var(--code-bg);
  --pico-code-color:             var(--copper);
  --pico-ins-color:              var(--gold);
  --pico-del-color:              #8b3a3a;
  --pico-form-element-background-color: var(--bg-elevated);
  --pico-form-element-border-color:     var(--border-bright);
}

[data-theme="light"] {
  --bg:            #f5e6c8;
  --bg-surface:    #ede0c0;
  --bg-elevated:   #e5d5a8;
  --border:        #c8a87a;
  --border-bright: #a07840;
  --copper:        #8b4e1a;
  --gold:          #6b4a10;
  --gold-dim:      #9a7030;
  --text:          #1a0f05;
  --text-muted:    #6b4a2a;
  --text-heading:  #3a1f05;
  --code-bg:       #dfd0a8;
  --rivet:         #8a6030;

  --pico-background-color:       var(--bg);
  --pico-card-background-color:  var(--bg-surface);
  --pico-card-border-color:      var(--border);
  --pico-color:                  var(--text);
  --pico-h1-color:               var(--text-heading);
  --pico-h2-color:               var(--text-heading);
  --pico-h3-color:               var(--gold);
  --pico-primary:                var(--copper);
  --pico-primary-hover:          var(--gold);
  --pico-secondary-color:        var(--text-muted);
  --pico-border-color:           var(--border);
  --pico-muted-color:            var(--text-muted);
  --pico-muted-border-color:     var(--border);
  --pico-code-background-color:  var(--code-bg);
  --pico-code-color:             var(--copper);
  --pico-form-element-background-color: var(--bg-elevated);
  --pico-form-element-border-color:     var(--border-bright);
}

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

body {
  font-family: 'Jost', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* Subtle gear-texture overlay via radial gradients */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(ellipse at 15% 20%, rgba(184,115,51,0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 85% 80%, rgba(201,168,76,0.03) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

.container { position: relative; z-index: 1; }

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Playfair Display', serif;
  color: var(--text-heading);
  letter-spacing: 0.02em;
}

h1 { font-size: 2.4rem; font-weight: 700; }
h2 { font-size: 1.7rem; font-weight: 600; }
h3 { font-size: 1.3rem; color: var(--gold); }

a {
  color: var(--copper);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover { color: var(--gold); text-decoration: underline; }

code, pre, kbd {
  font-family: 'Share Tech Mono', monospace;
}

pre {
  background: var(--code-bg) !important;
  border: 1px solid var(--border-bright);
  border-left: 3px solid var(--copper);
  border-radius: 0;
  padding: 1.25rem;
  overflow-x: auto;
}

code {
  background: var(--code-bg);
  color: var(--copper);
  padding: 0.1em 0.35em;
  border-radius: 2px;
  font-size: 0.88em;
}

pre code {
  background: transparent;
  padding: 0;
  color: var(--text);
  font-size: 0.875rem;
}

/* ── Navigation ── */
nav.site-nav {
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
  padding: 0.75rem 0;
  margin-bottom: 0;
  position: relative;
}

/* Copper pipe line under nav */
nav.site-nav::after {
  content: '';
  display: block;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--copper), var(--gold), var(--copper), transparent);
  position: absolute;
  bottom: -2px;
  left: 0; right: 0;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.nav-brand {
  font-family: 'Playfair Display', serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--gold) !important;
  letter-spacing: 0.05em;
  text-decoration: none !important;
}

.nav-brand:hover { color: var(--copper) !important; }

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--text);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav-links a:hover { color: var(--gold); text-decoration: none; }

.nav-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Theme toggle button */
.btn-theme {
  background: transparent;
  border: 1px solid var(--border-bright);
  color: var(--text-muted);
  padding: 0.3rem 0.65rem;
  font-size: 0.8rem;
  font-family: 'Share Tech Mono', monospace;
  cursor: pointer;
  border-radius: 2px;
  transition: border-color 0.2s, color 0.2s;
  line-height: 1;
}

.btn-theme:hover {
  border-color: var(--gold);
  color: var(--gold);
}

.lang-link {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.8rem;
  color: var(--text-muted) !important;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border: 1px solid var(--border);
  padding: 0.3rem 0.6rem;
  border-radius: 2px;
  transition: border-color 0.2s, color 0.2s;
}

.lang-link:hover {
  color: var(--copper) !important;
  border-color: var(--copper);
  text-decoration: none !important;
}

/* ── Pipe Divider ── */
.pipe-divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 2rem 0;
  color: var(--text-muted);
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

.pipe-divider::before,
.pipe-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-bright));
}

.pipe-divider::after {
  background: linear-gradient(90deg, var(--border-bright), transparent);
}

/* ── Rivet corners decoration ── */
.riveted {
  position: relative;
}

.riveted::before,
.riveted::after {
  content: '◉';
  position: absolute;
  color: var(--rivet);
  font-size: 0.6rem;
  line-height: 1;
}

.riveted::before { top: 0.4rem; left: 0.4rem; }
.riveted::after  { top: 0.4rem; right: 0.4rem; }

/* ── Post Cards (Blog Index) ── */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 2rem;
}

.post-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--copper);
  padding: 1.5rem 1.75rem;
  transition: border-color 0.2s ease, background 0.2s ease;
  position: relative;
}

.post-card::before,
.post-card::after {
  content: '◉';
  position: absolute;
  color: var(--rivet);
  font-size: 0.55rem;
  line-height: 1;
}
.post-card::before { top: 0.5rem; left: 0.5rem; }
.post-card::after  { top: 0.5rem; right: 0.5rem; }

.post-card:hover {
  border-left-color: var(--gold);
  background: var(--bg-elevated);
}

.post-card h2 {
  font-size: 1.4rem;
  margin: 0 0 0.35rem;
}

.post-card h2 a {
  color: var(--text-heading);
}

.post-card h2 a:hover {
  color: var(--gold);
  text-decoration: none;
}

.post-meta {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.post-description {
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 1rem;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.tag {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.7rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 0.15rem 0.5rem;
  letter-spacing: 0.05em;
  text-transform: lowercase;
}

.read-more {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.8rem;
  color: var(--copper);
  letter-spacing: 0.05em;
}

.read-more:hover {
  color: var(--gold);
  text-decoration: none;
}

/* ── Individual Post ── */
.post-header {
  margin: 2.5rem 0 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
  position: relative;
}

/* Decorative bracket corners on post header */
.post-header::before {
  content: '⟦';
  position: absolute;
  top: 0; left: -0.5rem;
  color: var(--copper);
  font-size: 2rem;
  opacity: 0.4;
}

.post-header h1 {
  margin: 0 0 0.5rem;
  line-height: 1.2;
}

.post-body {
  max-width: 72ch;
  line-height: 1.8;
  font-size: 1.05rem;
}

.post-body h2 {
  margin-top: 2rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--copper);
}

.post-body h3 {
  margin-top: 1.5rem;
}

.post-body ul, .post-body ol {
  padding-left: 1.5rem;
}

.post-body li { margin-bottom: 0.25rem; }

.post-body blockquote {
  border-left: 3px solid var(--gold);
  padding-left: 1rem;
  color: var(--text-muted);
  font-style: italic;
  margin: 1.5rem 0;
}

.post-footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.back-link {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.back-link:hover { color: var(--copper); text-decoration: none; }

/* ── Page Header (Blog index title) ── */
.page-header {
  margin: 2.5rem 0 0;
  padding-bottom: 1rem;
}

.page-header h1 {
  font-size: 2rem;
  margin-bottom: 0.25rem;
}

.page-subtitle {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ── About Page ── */
.about-body {
  max-width: 72ch;
  line-height: 1.8;
  font-size: 1.05rem;
  margin-top: 2rem;
}

.about-body h2 {
  margin-top: 2rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--gold);
}

.about-body ul {
  padding-left: 1.5rem;
}

.about-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

/* ── Footer ── */
footer.site-footer {
  margin-top: 4rem;
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  position: relative;
}

footer.site-footer::before {
  content: '';
  display: block;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--border-bright), transparent);
  position: absolute;
  top: -2px;
  left: 0; right: 0;
}

/* ── 404 Page ── */
.not-found {
  text-align: center;
  padding: 5rem 0;
}

.not-found h1 {
  font-size: 4rem;
  color: var(--copper);
  opacity: 0.6;
}

/* ── Responsive ── */
@media (max-width: 640px) {
  h1 { font-size: 1.8rem; }
  .nav-inner { gap: 0.75rem; }
  .post-card { padding: 1.25rem; }
}