/* ============================================================
   CHAMINDRA DE SILVA — Steampunk Sci-Fi Theme
   Inspired by Blade Runner, Neuromancer, 2001, Classical Oxford
   ============================================================ */

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

:root {
  --bg-primary:   #0e111b;
  --bg-secondary: #111522;
  --bg-nav:       #121625;
  --bg-card:      #151a28;
  --text-primary:   #dedfd9;
  --text-secondary: #b7bab7;
  --text-muted:     #92978f;
  --text-dim:       #747b79;
  --amber:     #EF9F27;
  --amber-dim: rgba(239,159,39,0.16);
  --teal:      #5DCAA5;
  --teal-dim:  rgba(93,202,165,0.12);
  --cat-os:    #5DCAA5;
  --cat-is:    #AFA9EC;
  --cat-ai:    #85B7EB;
  --cat-hfoss: #F0997B;
  --cat-sus:   #97C459;
  --cat-gen:   #B4B2A9;
  --font-serif: Georgia, 'Times New Roman', serif;
  --font-mono:  'Courier New', Courier, monospace;
}

html { font-size: 16px; }

body {
  background: #090b12;
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.6;
}

/* ── WRAPPER ── */
.site-wrapper {
  max-width: 960px;
  margin: 0 auto;
  background: var(--bg-primary);
  min-height: 100vh;
  border-left:  0.5px solid var(--amber-dim);
  border-right: 0.5px solid var(--amber-dim);
}

/* ── HEADER ── */
.site-header {
  background:
    linear-gradient(90deg, rgba(6,8,15,0.7) 0%, rgba(6,8,15,0.42) 42%, rgba(6,8,15,0.12) 100%),
    linear-gradient(to bottom, rgba(6,8,15,0.05) 0%, rgba(6,8,15,0.28) 100%),
    url('/assets/images/header-bg-polished.png') center center / cover no-repeat;
  border-bottom: 1px solid var(--amber-dim);
  padding: 2rem 1.5rem 1.5rem;
  position: relative;
  overflow-y: hidden;
  overflow-x: clip;
}


.header-grid {
  display: block;
  position: relative;
  z-index: 1;
}

.site-title {
  font-family: var(--font-serif);
  font-size: 34px;
  font-weight: normal;
  color: var(--amber);
  letter-spacing: 0.03em;
  margin-bottom: 5px;
  line-height: 1.1;
}

.site-title a { color: inherit; text-decoration: none; }

.site-role {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--teal);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 14px;
  white-space: nowrap;
  text-shadow: 0 1px 8px rgba(0,0,0,0.9);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

.site-bio {
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 520px;
  margin-bottom: 14px;
  font-style: italic;
}

.header-tags { display: flex; gap: 5px; flex-wrap: wrap; }

.header-tag {
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 1px;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  border: 0.5px solid;
  text-decoration: none;
  transition: opacity 0.15s;
}
.header-tag:hover { opacity: 0.75; }

.ht-os    { color: var(--cat-os);    border-color: rgba(93,202,165,0.4);   background: rgba(93,202,165,0.07); }
.ht-is    { color: var(--cat-is);    border-color: rgba(175,169,236,0.4);  background: rgba(175,169,236,0.07); }
.ht-ai    { color: var(--cat-ai);    border-color: rgba(133,183,235,0.4);  background: rgba(133,183,235,0.07); }
.ht-hfoss { color: var(--cat-hfoss); border-color: rgba(240,153,123,0.4);  background: rgba(240,153,123,0.07); }
.ht-sus   { color: var(--cat-sus);   border-color: rgba(151,196,89,0.4);   background: rgba(151,196,89,0.07); }
.ht-gen   { color: var(--cat-gen);   border-color: rgba(180,178,169,0.4);  background: rgba(180,178,169,0.07); }

.header-awards { text-align: right; }

.award-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  color: rgba(239,159,39,0.58);
  border: 0.5px solid rgba(239,159,39,0.22);
  padding: 4px 10px;
  margin-bottom: 3px;
  display: block;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.award-badge-highlight {
  color: var(--amber);
  border-color: rgba(239,159,39,0.55);
  background: rgba(239,159,39,0.06);
}

/* ── NAVIGATION ── */
.site-nav {
  background: var(--bg-nav);
  border-bottom: 1px solid var(--amber-dim);
  padding: 0 1.5rem;
  display: flex;
  overflow-x: auto;
  scrollbar-width: none;
}
.site-nav::-webkit-scrollbar { display: none; }

.site-nav a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 10px 12px;
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1.5px solid transparent;
  white-space: nowrap;
  transition: color 0.15s;
  display: block;
}
.site-nav a:hover,
.site-nav a.active { color: var(--amber); border-bottom-color: var(--amber); }

/* ── MAIN LAYOUT ── */
.site-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
}

/* ── SIDEBAR ── */
.site-sidebar {
  background: var(--bg-secondary);
  border-right: 0.5px solid var(--amber-dim);
  padding: 1.4rem 1.1rem;
  min-height: calc(100vh - 130px);
}

.sb-section { margin-bottom: 1.2rem; }

.sb-heading {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
  padding-bottom: 5px;
  margin-bottom: 7px;
  border-bottom: 0.5px solid var(--amber-dim);
}

.sb-item {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  padding: 2px 0;
  line-height: 1.5;
  display: flex;
  align-items: baseline;
  gap: 4px;
}
.sb-item::before {
  content: '›';
  color: rgba(239,159,39,0.38);
  font-family: var(--font-mono);
  flex-shrink: 0;
}
.sb-item a { color: var(--teal); text-decoration: none; }
.sb-item a:hover { color: #9FE1CB; }

.sb-award {
  flex-direction: column;
  align-items: flex-start;
  gap: 1px;
}

.sb-award-year {
  font-family: var(--font-mono);
  font-size: 10px;
  color: rgba(239,159,39,0.72);
  letter-spacing: 0.1em;
}

.sb-patent {
  flex-direction: column;
  align-items: flex-start;
  gap: 1px;
}

.sb-patent-detail {
  font-family: var(--font-mono);
  font-size: 10px;
  color: rgba(93,202,165,0.72);
  letter-spacing: 0.06em;
}

.tag-cloud { display: flex; gap: 3px; flex-wrap: wrap; }

.cloud-tag {
  font-size: 12px;
  padding: 2px 6px;
  background: #12131f;
  border: 0.5px solid rgba(239,159,39,0.13);
  color: var(--text-muted);
  text-decoration: none;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  transition: color 0.15s, border-color 0.15s;
}
.cloud-tag:hover { color: var(--amber); border-color: rgba(239,159,39,0.45); }

.pub-sb-item {
  padding: 5px 0;
  border-bottom: 0.5px solid rgba(239,159,39,0.07);
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.4;
}
.pub-sb-item:last-child { border-bottom: none; }
.pub-sb-item strong {
  color: var(--text-secondary);
  font-weight: 500;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: 1px;
}
.pub-sb-item a { color: rgba(93,202,165,0.82); text-decoration: none; }
.pub-sb-item a:hover { color: var(--teal); }

/* ── CONTENT AREA ── */
.site-content { padding: 1.5rem 1.75rem 2rem; }

/* Feed */
.feed-header { margin-bottom: 10px; }
.feed-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
}

.cat-filters { display: flex; gap: 3px; flex-wrap: wrap; margin-bottom: 10px; }

.cat-filter {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 1px;
  cursor: pointer;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  border: 0.5px solid;
  background: transparent;
  transition: opacity 0.15s;
}
.cat-filter:hover { opacity: 0.75; }

.cf-all   { color: var(--amber);     border-color: rgba(239,159,39,0.65); }
.cf-os    { color: var(--cat-os);    border-color: rgba(93,202,165,0.45); }
.cf-is    { color: var(--cat-is);    border-color: rgba(175,169,236,0.45); }
.cf-ai    { color: var(--cat-ai);    border-color: rgba(133,183,235,0.45); }
.cf-hfoss { color: var(--cat-hfoss); border-color: rgba(240,153,123,0.45); }
.cf-sus   { color: var(--cat-sus);   border-color: rgba(151,196,89,0.45); }
.cf-gen   { color: var(--cat-gen);   border-color: rgba(180,178,169,0.45); }
.cf-books { color: var(--cat-gen);   border-color: rgba(180,178,169,0.45); }
.cf-jnl   { color: var(--cat-ai);    border-color: rgba(133,183,235,0.45); }
.cf-un    { color: var(--cat-hfoss); border-color: rgba(240,153,123,0.45); }
.cf-conf  { color: var(--cat-os);    border-color: rgba(93,202,165,0.45); }
.cf-ind   { color: var(--cat-sus);   border-color: rgba(151,196,89,0.45); }
.cf-pres  { color: var(--cat-is);    border-color: rgba(175,169,236,0.45); }

.brass-sep {
  height: 0.5px;
  background: linear-gradient(90deg, transparent 0%, rgba(239,159,39,0.22) 30%, rgba(239,159,39,0.22) 70%, transparent 100%);
  margin: 2px 0 12px;
}

/* Post items on index */
.post-item {
  padding: 15px 0;
  border-bottom: 0.5px solid rgba(239,159,39,0.13);
}
.post-item:last-child { border-bottom: none; }

.post-meta { display: flex; align-items: center; gap: 6px; margin-bottom: 4px; }

.post-cat-badge {
  font-size: 10px;
  padding: 2px 7px;
  font-family: var(--font-mono);
  letter-spacing: 0.07em;
  border: 0.5px solid;
}
.pcb-open-source  { color: var(--cat-os);    border-color: rgba(93,202,165,0.42);   background: rgba(93,202,165,0.06); }
.pcb-innersource  { color: var(--cat-is);    border-color: rgba(175,169,236,0.42);  background: rgba(175,169,236,0.06); }
.pcb-ai           { color: var(--cat-ai);    border-color: rgba(133,183,235,0.42);  background: rgba(133,183,235,0.06); }
.pcb-hfoss        { color: var(--cat-hfoss); border-color: rgba(240,153,123,0.42);  background: rgba(240,153,123,0.06); }
.pcb-sustainability{ color: var(--cat-sus);  border-color: rgba(151,196,89,0.42);   background: rgba(151,196,89,0.06); }
.pcb-general      { color: var(--cat-gen);   border-color: rgba(180,178,169,0.42);  background: rgba(180,178,169,0.06); }

.post-date {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}

.post-new {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--teal);
  border: 0.5px solid rgba(93,202,165,0.38);
  padding: 1px 5px;
  letter-spacing: 0.06em;
}

.post-title {
  font-family: var(--font-serif);
  font-size: 20px;
  color: #d8c18b;
  margin-bottom: 6px;
  line-height: 1.35;
}
.post-title a { color: inherit; text-decoration: none; transition: color 0.15s; }
.post-title a:hover { color: var(--amber); }

.post-excerpt {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 7px;
}

.post-sources { display: flex; gap: 10px; }

.source-link {
  font-family: var(--font-mono);
  font-size: 11px;
  color: rgba(93,202,165,0.78);
  text-decoration: none;
  letter-spacing: 0.06em;
  border-bottom: 0.5px solid rgba(93,202,165,0.22);
  transition: color 0.15s;
}
.source-link:hover { color: var(--teal); border-bottom-color: var(--teal); }

/* ── SINGLE POST ── */
.post-header {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 0.5px solid var(--amber-dim);
}

.post-header .post-title { font-size: 26px; margin-top: 8px; }
.post-header .post-title a { color: var(--amber); }

.post-cover { margin: 0 0 1.5rem 0; }
.post-cover img { width: 100%; max-height: 320px; object-fit: cover; border: 1px solid var(--amber-dim); display: block; }

.post-body { color: var(--text-secondary); }

.post-body h2 {
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--amber);
  margin: 1.75rem 0 0.75rem;
  font-weight: normal;
}

.post-body h3 {
  font-family: var(--font-mono);
  font-size: 12px;
  color: #9a8860;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 1.25rem 0 0.6rem;
}

.post-body p {
  margin-bottom: 1rem;
  line-height: 1.8;
  font-size: 17px;
}

.post-body a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 0.5px solid rgba(93,202,165,0.3);
}
.post-body a:hover { color: #9FE1CB; }

.post-body blockquote {
  border-left: 2px solid var(--amber);
  margin: 1.2rem 0;
  padding: 0.5rem 1rem;
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--text-secondary);
  background: rgba(239,159,39,0.04);
}

.post-body ul, .post-body ol {
  margin: 0.75rem 0 1rem 1.5rem;
  font-size: 17px;
}
.post-body li { margin-bottom: 0.4rem; line-height: 1.65; }

.post-body strong { color: var(--text-primary); font-weight: 500; }

.post-image {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1.2rem auto;
  border: 0.5px solid var(--amber-dim);
  border-radius: 2px;
  opacity: 0.9;
}

.post-footer {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 0.5px solid var(--amber-dim);
}

.post-ref {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 5px;
  letter-spacing: 0.06em;
}
.post-ref a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 0.5px solid rgba(93,202,165,0.28);
}
.post-ref a:hover { color: #9FE1CB; }

/* ── PAGE LAYOUT ── */
.page-header {
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 0.5px solid var(--amber-dim);
}

.page-title {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: normal;
  color: var(--amber);
}

.page-body { color: var(--text-secondary); }

.page-body h2 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 1.5rem 0 0.75rem;
  padding-bottom: 5px;
  border-bottom: 0.5px solid var(--amber-dim);
}

.page-body p {
  font-size: 17px;
  line-height: 1.8;
  margin-bottom: 1rem;
}

.page-body a { color: var(--teal); text-decoration: none; border-bottom: 0.5px solid rgba(93,202,165,0.28); }
.page-body a:hover { color: #9FE1CB; }

.page-body ul, .page-body ol {
  margin: 0.5rem 0 1rem 1.4rem;
  font-size: 17px;
}
.page-body li { margin-bottom: 0.45rem; line-height: 1.65; }

/* Publications page */
.pub-category-head {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 1.5rem 0 0.75rem;
  padding-bottom: 5px;
  border-bottom: 0.5px solid var(--amber-dim);
}

.claude-note {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.05em;
  border-left: 2px solid var(--teal);
  padding: 0.35rem 0.75rem;
  margin-bottom: 1.5rem;
  opacity: 0.7;
}

.pub-entry {
  padding: 0.75rem 0;
  border-bottom: 0.5px solid rgba(239,159,39,0.07);
}
.pub-entry:last-child { border-bottom: none; }

.pub-venue {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: rgba(239,159,39,0.65);
  margin-bottom: 3px;
}

.pub-title {
  font-family: var(--font-serif);
  font-size: 15px;
  color: #d8c18b;
  margin-bottom: 4px;
  line-height: 1.4;
}
.pub-title a { color: inherit; text-decoration: none; border-bottom: 0.5px solid rgba(192,168,112,0.28); }
.pub-title a:hover { color: var(--amber); border-bottom-color: var(--amber); }

.pub-authors {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}

.pub-abstract {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 4px;
}

.pub-links { display: flex; gap: 8px; }
.pub-link {
  font-family: var(--font-mono);
  font-size: 10px;
  color: rgba(93,202,165,0.78);
  text-decoration: none;
  border-bottom: 0.5px solid rgba(93,202,165,0.2);
  letter-spacing: 0.05em;
}
.pub-link:hover { color: var(--teal); }

/* ── CATEGORY EMPTY STATE ── */
.cat-empty {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  padding: 2rem 0;
}

/* ── FOOTER ── */
.site-footer {
  background: var(--bg-secondary);
  border-top: 0.5px solid var(--amber-dim);
  padding: 0.9rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-contact {
  font-family: var(--font-mono);
  font-size: 11px;
  color: rgba(93,202,165,0.5);
  letter-spacing: 0.06em;
}
.footer-contact a { color: inherit; text-decoration: none; }
.footer-contact a:hover { color: var(--teal); }

.footer-copy {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}

/* ── RESPONSIVE ── */
@media (max-width: 680px) {
  .site-layout { display: flex; flex-direction: column; }
  .site-content { order: 1; }
  .site-sidebar { order: 2; }
  .site-sidebar { border-right: none; border-bottom: 0.5px solid var(--amber-dim); min-height: auto; }
  .header-grid { grid-template-columns: 1fr; }
  .header-awards { display: none; }
  .site-nav { padding: 0 0.75rem; }
  .site-content { padding: 1.25rem; }
  .site-title { font-size: 30px; }
  .site-role { font-size: 11px; white-space: normal; line-height: 1.6; }
}