/* ── Soterra Labs · Thinking (matches gpu-navigator product page theme) ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --navy-deep:    #0f172a;
  --navy-mid:     #1e3a5f;
  --slate-dark:   #1e293b;
  --slate-body:   #374151;
  --slate-lead:   #475569;
  --slate-mute:   #94a3b8;
  --slate-pale:   #cbd5e1;
  --green-deep:   #059669;
  --green-bright: #4ade80;
  --green-ink:    #166534;
  --green-wash:   #ecfdf5;
  --green-edge:   #86efac;
  --bg-canvas:    #edf0f4;
  --bg-canvas-2:  #e3e8ef;
  --bg-card:      #ffffff;
  --border:       #e2e8f0;
  --border-light: #f1f5f9;
  --code-bg:      #f1f5f9;
  --code-border:  #cbd5e1;
}

html { scroll-behavior: smooth; }
body {
  font-family: 'Segoe UI', -apple-system, Arial, sans-serif;
  color: var(--slate-dark);
  background: var(--bg-canvas);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── NAV (mirrors gpu-navigator.html) ── */
nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
}
.nav-inner {
  max-width: 1400px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 96px;
}
@media (max-width: 540px) { .nav-inner { height: auto; padding: 12px 16px; } }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo img { height: 60px; width: auto; display: block; }
@media (max-width: 540px) { .logo img { height: 40px; max-width: 100%; } }
.nav-links { display: flex; gap: 20px; list-style: none; align-items: center; }
.nav-links a {
  text-decoration: none; color: var(--slate-body);
  font-size: 14px; font-weight: 500;
  padding: 10px 0;
  white-space: nowrap; transition: color 0.2s ease;
}
.nav-links a:hover { color: var(--slate-dark); }
.nav-links a.active { color: var(--green-deep); font-weight: 600; }

.nav-toggle {
  display: none; flex-direction: column; justify-content: center;
  gap: 5px; background: none; border: none; cursor: pointer;
  padding: 4px; width: 36px; height: 36px;
}
.nav-toggle span {
  display: block; height: 2px; width: 22px; background: var(--slate-body);
  border-radius: 2px; transition: transform 0.2s, opacity 0.2s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 1100px) {
  .nav-toggle { display: flex; }
  .nav-links {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    background: rgba(255,255,255,0.98); border-bottom: 1px solid var(--border);
    flex-direction: column; gap: 0; padding: 8px 0 12px;
  }
  .nav-links.open { display: flex; }
  .nav-links li a {
    display: block; padding: 14px 24px; font-size: 12px;
    border-radius: 0; letter-spacing: 1.5px;
  }
  .nav-links li a:hover { background: var(--green-wash); }
}

/* ── POST PAGE ── */
.post { padding: 40px 24px 56px; }
@media (max-width: 540px) { .post { padding: 20px 0 32px; } }
.post-inner {
  max-width: 760px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 44px 56px 48px;
  box-shadow: 0 1px 3px rgba(15,23,42,0.04);
}
@media (max-width: 540px) {
  .post-inner {
    padding: 32px 22px 36px;
    border-radius: 0;
    border-left: none;
    border-right: none;
  }
}

.post-tag {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--green-deep);
  margin-bottom: 10px;
}
.post h1 {
  font-size: clamp(26px, 3.4vw, 34px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--navy-deep);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.post-subtitle {
  font-size: clamp(16px, 1.8vw, 18px);
  color: var(--slate-lead);
  line-height: 1.55;
  margin-bottom: 18px;
  font-weight: 500;
}
.post-meta {
  font-size: 13px;
  color: var(--slate-lead);
  margin-bottom: 6px;
}
.post-origin {
  font-size: 12px;
  color: var(--slate-mute);
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.post-origin a {
  color: var(--slate-lead);
  text-decoration: none;
  border-bottom: 1px dotted var(--slate-mute);
}
.post-origin a:hover { color: var(--green-deep); border-bottom-color: var(--green-deep); }

/* ── POST BODY ── */
.post-body {
  font-size: 16px;
  line-height: 1.75;
  color: var(--slate-body);
}
.post-body p { margin-bottom: 18px; }
.post-body h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--navy-deep);
  margin-top: 36px;
  margin-bottom: 14px;
  line-height: 1.3;
  letter-spacing: -0.005em;
}
.post-body h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--slate-dark);
  margin-top: 26px;
  margin-bottom: 10px;
  line-height: 1.3;
}
.post-body strong { font-weight: 700; color: var(--slate-dark); }
.post-body em { font-style: italic; }
.post-body a {
  color: var(--green-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(5,150,105,0.3);
}
.post-body a:hover { border-bottom-color: var(--green-deep); }
.post-body ul, .post-body ol { margin: 0 0 18px 0; padding-left: 24px; }
.post-body li { margin-bottom: 6px; }

.post-body code {
  font-family: 'SF Mono', Menlo, Monaco, Consolas, 'Courier New', monospace;
  font-size: 14px;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--navy-deep);
  border: 1px solid var(--code-border);
}
.post-body pre {
  background: var(--navy-deep);
  border: none;
  border-left: 3px solid var(--green-bright);
  border-radius: 0 6px 6px 0;
  padding: 16px 18px;
  overflow-x: auto;
  margin-bottom: 20px;
  font-size: 13.5px;
  line-height: 1.6;
  color: #e2e8f0;
}
.post-body pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.post-body table {
  width: 100%; border-collapse: collapse; margin-bottom: 22px; font-size: 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}
.post-body colgroup, .post-body col { display: none; }
.post-body th {
  text-align: left; padding: 10px 14px; background: var(--bg-canvas-2);
  border-bottom: 1px solid var(--border); font-weight: 700;
  color: var(--navy-deep); letter-spacing: 0.2px; font-size: 13px;
}
.post-body td {
  padding: 10px 14px; border-bottom: 1px solid var(--border-light);
  vertical-align: top; color: var(--slate-body);
}
.post-body tr:last-child td { border-bottom: none; }

.post-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 32px 0;
}
.post-body blockquote {
  background: #fafbfc;
  border-left: 3px solid var(--green-deep);
  border-radius: 0 6px 6px 0;
  padding: 12px 18px;
  margin: 0 0 22px 0;
  color: var(--slate-lead);
  font-style: italic;
}

/* ── Series banner (MCP Part 1/2) ── */
.post-body .series-banner {
  background: var(--green-wash);
  border: 1px solid var(--green-edge);
  border-left: 3px solid var(--green-deep);
  border-radius: 0 6px 6px 0;
  padding: 12px 16px;
  margin-bottom: 26px;
  font-size: 13px;
}
.post-body .series-banner p { margin-bottom: 0; }
.post-body .series-label {
  display: inline-block;
  font-weight: 800;
  letter-spacing: 0.6px;
  color: var(--green-ink);
  margin-right: 10px;
}
.post-body .series-links a {
  color: var(--slate-dark);
  border-bottom: 1px dotted var(--slate-mute);
  font-weight: 600;
}
.post-body .series-links a:hover { color: var(--green-deep); border-bottom-color: var(--green-deep); }

/* ── Callout (Professional Digital Twin → Sri System) ── */
.post-body .callout {
  background: var(--bg-canvas);
  border: 1px solid var(--border);
  border-left: 3px solid var(--green-deep);
  border-radius: 0 6px 6px 0;
  padding: 14px 18px;
  margin-bottom: 24px;
  font-size: 15px;
}
.post-body .callout p { margin-bottom: 0; line-height: 1.6; color: var(--slate-body); }
.post-body .callout a { color: var(--green-deep); font-weight: 600; }

/* ── POST FOOTER ── */
.post-footer {
  margin-top: 44px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.post-footer a {
  color: var(--green-deep);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.2px;
}
.post-footer a:hover { text-decoration: underline; }

/* ── ARCHIVE PAGE ── */
.archive-header {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 60%, #0f172a 100%);
  padding: 56px 40px 44px;
  position: relative;
  overflow: hidden;
  color: #fff;
}
.archive-header::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(74,222,128,0.08) 0%, transparent 60%);
  pointer-events: none;
}
@media (max-width: 540px) { .archive-header { padding: 36px 22px 28px; } }
.archive-header-inner { max-width: 960px; margin: 0 auto; position: relative; }
.archive-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--green-bright);
  margin-bottom: 12px;
}
.archive-header h1 {
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
  line-height: 1.2;
  letter-spacing: -0.01em;
}
.archive-header p {
  font-size: clamp(15px, 1.8vw, 17px);
  color: #cbd5e1;
  line-height: 1.6;
  max-width: 680px;
}

.archive-list {
  padding: 48px 24px 64px;
  background: var(--bg-canvas);
}
@media (max-width: 540px) { .archive-list { padding: 32px 20px 48px; } }
.archive-list-inner {
  max-width: 760px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 32px;
  box-shadow: 0 1px 3px rgba(15,23,42,0.04);
}
@media (max-width: 540px) { .archive-list-inner { padding: 4px 20px; } }

.archive-post {
  display: block;
  padding: 22px 0;
  border-bottom: 1px solid var(--border-light);
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s ease;
}
.archive-post:hover { transform: translateX(4px); }
.archive-post:last-child { border-bottom: none; }
.archive-post .archive-date {
  font-size: 10px;
  color: var(--green-deep);
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 6px;
  text-transform: uppercase;
}
.archive-post h2 {
  font-size: 19px;
  font-weight: 700;
  color: var(--navy-deep);
  margin-bottom: 6px;
  line-height: 1.35;
  letter-spacing: -0.005em;
}
.archive-post p {
  font-size: 14.5px;
  color: var(--slate-lead);
  line-height: 1.55;
}

/* ── FOOTER ── */
footer {
  background: var(--navy-deep);
  border-top: 1px solid #1f2937;
  padding: 24px;
  text-align: center;
}
footer p { font-size: 13px; color: #cbd5e1; }
footer span { color: var(--green-bright); }
footer .footer-sep { color: #64748b; margin: 0 8px; }
footer .footer-link { color: var(--green-bright); text-decoration: none; }
footer .footer-link:hover { text-decoration: underline; }