/* ============================================================
   Meridian Software Systems — shared stylesheet
   Dependency-free. Dark, restrained, technical.
   ============================================================ */

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

:root {
  color-scheme: dark;

  --ground: #0B0D11;
  --surface: #12151B;
  --surface-raised: #181C24;
  --border: #1E2230;
  --border-hover: #2A2F3E;

  --text-primary: #E2E4EA;
  --text-secondary: #7D8294;
  --text-tertiary: #505468;

  --accent: #C8863A;
  --accent-dim: #9E6A2E;
  --accent-glow: rgba(200, 134, 58, 0.10);

  /* status dots */
  --dot-live: #6FA56B;   /* released / stable */
  --dot-active: #C8863A; /* active development */
  --dot-plan: #6B8CA5;   /* planning / early */

  --font-display: 'Manrope', system-ui, -apple-system, sans-serif;
  --font-body: 'Source Sans 3', system-ui, -apple-system, sans-serif;
  --font-mono: 'Source Code Pro', ui-monospace, 'SFMono-Regular', monospace;

  --wrap: 960px;
  --wrap-narrow: 680px;
  --radius: 8px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--ground);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  padding: 0 24px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; }

.wrap { max-width: var(--wrap); margin: 0 auto; }
.wrap-narrow { max-width: var(--wrap-narrow); margin: 0 auto; }

/* Accessibility: skip link + focus rings */
.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 100;
  padding: 8px 16px;
  background: var(--surface-raised);
  border: 1px solid var(--border-hover);
  border-radius: var(--radius);
  color: var(--text-primary);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 14px;
  transition: top 0.18s var(--ease);
}
.skip-link:focus { top: 16px; }

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

/* ---- Header / nav ---- */

header { padding-block: 28px; }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-mark { display: block; transition: transform 0.4s var(--ease); }
.logo:hover .logo-mark { transform: rotate(30deg); }

.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.15s;
  position: relative;
}
.nav-link:hover,
.nav-link[aria-current="page"] { color: var(--text-primary); }
.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 1.5px;
  background: var(--accent);
}

.gh-link {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.15s;
}
.gh-link:hover { color: var(--text-primary); }

/* ---- Generic section scaffolding ---- */

.section-label {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-tertiary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 32px;
}

.section-label .num { color: var(--accent-dim); margin-right: 10px; }

/* ---- Hero (home) ---- */

.hero {
  position: relative;
  padding-block: 84px 96px;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -10%;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 68%);
  pointer-events: none;
  z-index: -1;
}

.hero-tag {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(30px, 5.4vw, 52px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.028em;
  max-width: 740px;
  text-wrap: balance;
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 580px;
  line-height: 1.6;
  margin-bottom: 36px;
}

/* ---- Buttons ---- */

.btn-row { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 12px 20px;
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, color 0.15s, transform 0.15s var(--ease);
}
.btn svg { width: 16px; height: 16px; }
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent);
  color: #14100A;
}
.btn-primary:hover { background: #D99a4f; }

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-hover);
}
.btn-ghost:hover { border-color: var(--text-tertiary); background: var(--surface); }

/* ---- Principles / value grid ---- */

.principles { padding-block: 72px; border-bottom: 1px solid var(--border); }

.pcols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.pcol h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.pcol h3 .glyph { color: var(--accent); font-family: var(--font-mono); font-weight: 500; font-size: 15px; }
.pcol p { font-size: 15px; color: var(--text-secondary); line-height: 1.6; }

/* ---- Projects ---- */

.projects { padding-block: 72px 80px; border-bottom: 1px solid var(--border); }

.pgrid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.proj {
  display: flex;
  flex-direction: column;
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  transition: border-color 0.15s, background-color 0.15s, transform 0.15s var(--ease);
}
.proj:hover {
  border-color: var(--border-hover);
  background: var(--surface-raised);
  transform: translateY(-2px);
}

.proj-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.proj h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.proj .arrow {
  color: var(--text-tertiary);
  transition: transform 0.2s var(--ease), color 0.15s;
  flex-shrink: 0;
}
.proj:hover .arrow { color: var(--accent); transform: translate(2px, -2px); }

.proj-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.55;
  flex: 1;
  margin-bottom: 20px;
}

.proj-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.proj-tech {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
}

/* status pill */
.status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}
.status .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--dot-active);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--dot-active) 18%, transparent);
}
.status.live .dot { background: var(--dot-live); box-shadow: 0 0 0 3px color-mix(in srgb, var(--dot-live) 18%, transparent); }
.status.plan .dot { background: var(--dot-plan); box-shadow: 0 0 0 3px color-mix(in srgb, var(--dot-plan) 18%, transparent); }

/* ---- About ---- */

.about { padding-block: 72px 80px; border-bottom: 1px solid var(--border); }
.about-body {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.65;
}
.about-body + .about-body { margin-top: 18px; }

/* ---- Get involved / contact ---- */

.involve { padding-block: 72px 80px; }

.involve-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.icard {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.15s;
}
.icard:hover { border-color: var(--border-hover); }
.icard h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.icard p { font-size: 15px; color: var(--text-secondary); line-height: 1.55; margin-bottom: 16px; }
.icard .link {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.icard .link:hover { color: #D99a4f; }
.icard .link .arrow { transition: transform 0.15s var(--ease); }
.icard .link:hover .arrow { transform: translateX(3px); }

/* ---- Sub-page hero (project + blog) ---- */

.subhero {
  padding-block: 56px 40px;
  border-bottom: 1px solid var(--border);
}
.crumbs {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.crumbs a { color: var(--text-secondary); text-decoration: none; transition: color 0.15s; }
.crumbs a:hover { color: var(--text-primary); }
.crumbs .sep { color: var(--text-tertiary); }

.subhero h1 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4.6vw, 42px);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin-bottom: 16px;
  text-wrap: balance;
}
.subhero .lead {
  font-size: 19px;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.55;
  margin-bottom: 24px;
}

.meta-row {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

/* ---- Prose (project body + blog post) ---- */

.prose { padding-block: 48px 72px; }
.prose > * { max-width: var(--wrap-narrow); }

.prose h2 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin: 44px 0 16px;
}
.prose h2:first-child { margin-top: 0; }
.prose h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  margin: 32px 0 12px;
}
.prose p { color: var(--text-secondary); margin-bottom: 18px; line-height: 1.7; }
.prose p strong { color: var(--text-primary); font-weight: 600; }
.prose a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent-dim); }
.prose a:hover { color: #D99a4f; }

.prose ul, .prose ol { color: var(--text-secondary); margin: 0 0 18px 22px; line-height: 1.7; }
.prose li { margin-bottom: 8px; }
.prose li::marker { color: var(--accent-dim); }

.prose code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
  color: var(--text-primary);
}

.prose blockquote {
  border-left: 2px solid var(--accent-dim);
  padding-left: 20px;
  margin: 0 0 18px;
  color: var(--text-secondary);
  font-style: italic;
}

.callout {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 0 0 24px;
  max-width: var(--wrap-narrow);
}
.callout p { margin: 0; font-size: 15px; }

/* spec / fact table for project pages */
.spec {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 0 0 8px;
  max-width: var(--wrap-narrow);
}
.spec-row {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 16px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
}
.spec-row:last-child { border-bottom: none; }
.spec-row dt {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-tertiary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding-top: 2px;
}
.spec-row dd { color: var(--text-primary); font-size: 15px; }

/* ---- Blog list ---- */

.postlist { padding-block: 48px 72px; }
.post-item {
  display: block;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  transition: opacity 0.15s;
}
.post-item:first-child { border-top: 1px solid var(--border); }
.post-item .date {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-tertiary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.post-item h2 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin: 8px 0 8px;
  transition: color 0.15s;
}
.post-item:hover h2 { color: var(--accent); }
.post-item .excerpt { color: var(--text-secondary); font-size: 15px; line-height: 1.6; max-width: 620px; }
.post-item .tag {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent-dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-block: 32px;
  border-top: 1px solid var(--border);
  max-width: var(--wrap-narrow);
}
.post-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  transition: color 0.15s;
}
.post-nav a:hover { color: var(--text-primary); }

/* ---- Footer ---- */

footer { padding-block: 40px 48px; border-top: 1px solid var(--border); }
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-nav { display: flex; gap: 22px; flex-wrap: wrap; }
.footer-nav a {
  font-family: var(--font-display);
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s;
}
.footer-nav a:hover { color: var(--text-primary); }
.footer-meta { display: flex; flex-direction: column; gap: 4px; text-align: right; }
.footer-copy, .footer-loc {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-tertiary);
  letter-spacing: 0.01em;
}

/* ---- Scroll reveal (progressive enhancement) ---- */

@media (prefers-reduced-motion: no-preference) {
  .js .reveal {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  }
  .js .reveal.in { opacity: 1; transform: none; }
}

/* ---- Responsive ---- */

@media (max-width: 760px) {
  .pcols { grid-template-columns: 1fr; gap: 24px; }
}

@media (max-width: 640px) {
  body { padding: 0 16px; }
  .hero { padding-block: 56px 64px; }
  .projects, .about, .principles, .involve { padding-block: 52px 60px; }
  .pgrid, .involve-grid { grid-template-columns: 1fr; }
  .spec-row { grid-template-columns: 1fr; gap: 4px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .footer-meta { text-align: left; }
  .nav { gap: 20px; }
}

/* ---- Screenshots / media ---- */

.prose .shot { max-width: var(--wrap-narrow); }
.prose .shot-wide,
.prose .gallery { max-width: var(--wrap); }

.shot {
  margin: 0 0 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
  transition: border-color 0.15s;
}
.shot:hover { border-color: var(--border-hover); }
.shot a { display: block; }
.shot img { display: block; width: 100%; height: auto; }
.shot figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-tertiary);
  letter-spacing: 0.03em;
  padding: 11px 16px;
  border-top: 1px solid var(--border);
}
.shot-compass { max-width: 460px; }

.gallery {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 0 0 10px;
}
.gallery .shot { margin: 0; }

@media (max-width: 640px) {
  .gallery { grid-template-columns: 1fr; }
}

/* ---- Under construction ---- */

.uc {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding: 24px 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  margin: 8px 0 0;
}
.uc-mark {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 100px;
  padding: 5px 12px;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 2px;
}
.uc h2 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 7px;
}
.uc p { color: var(--text-secondary); font-size: 15px; line-height: 1.6; margin: 0; }
.uc a { color: var(--accent); text-decoration: none; }
.uc a:hover { color: #D99a4f; }

.uc-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 100px;
  padding: 2px 8px;
  vertical-align: middle;
  margin-left: 9px;
  position: relative;
  top: -1px;
}

@media (max-width: 520px) {
  .uc { flex-direction: column; gap: 12px; }
}