/* ─────────────────────────────────────────────────────────────────────
   Obsidian AI Labs — main stylesheet
   Brand palette per ~/.claude/PAI/USER/SKILLCUSTOMIZATIONS/Art/PREFERENCES.md
   ───────────────────────────────────────────────────────────────────── */

:root {
  --obsidian-black: #0a0a0a;
  --obsidian-raised: #151515;
  --obsidian-line: #262626;
  --warm-white: #f5f3ee;
  --warm-white-soft: #ede9de;
  --muted: #9a958a;
  --muted-dim: #6b675e;
  --amber: #b8935c;
  --amber-bright: #d4a968;
  --teal: #4a8a8a;
  --teal-bright: #6ba5a5;
  --max-width: 1200px;
  --pad-section: clamp(4rem, 8vw, 7rem);
  --pad-container: clamp(1.25rem, 4vw, 2.5rem);
  --radius: 4px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-serif: "Newsreader", Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--obsidian-black);
  color: var(--warm-white);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; height: auto; }

a { color: var(--teal-bright); text-decoration: none; transition: color 150ms ease; }
a:hover { color: var(--amber-bright); }

h1, h2, h3 { font-family: var(--font-serif); font-weight: 500; letter-spacing: -0.01em; line-height: 1.15; margin: 0; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: var(--pad-container);
  padding-right: var(--pad-container);
}

/* ── Nav ─────────────────────────────────────────────────────────── */
.nav {
  position: absolute;
  top: 0; left: 0; right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.75rem var(--pad-container);
  max-width: var(--max-width);
  margin: 0 auto;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--warm-white);
  font-weight: 600;
  letter-spacing: 0.02em;
}
.brand-logo {
  width: 32px;
  height: 44px;
  object-fit: contain;
  filter: invert(1) brightness(1.15);
}
.brand-text { font-size: 0.95rem; text-transform: uppercase; }
.nav-links { display: flex; gap: 1.75rem; align-items: center; }
.nav-links a { color: var(--warm-white-soft); font-size: 0.9rem; }
.nav-links a:hover { color: var(--amber-bright); }
.nav-cta {
  border: 1px solid var(--obsidian-line);
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
}
.nav-cta:hover { border-color: var(--amber); }

/* Hamburger button — hidden on desktop, shown on mobile */
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--obsidian-line);
  border-radius: var(--radius);
  width: 44px;
  height: 44px;
  padding: 0;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  transition: border-color 180ms ease;
}
.nav-toggle:hover { border-color: var(--amber); }
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--warm-white);
  border-radius: 2px;
  transition: all 200ms ease;
}
.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: 720px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: var(--pad-container);
    left: var(--pad-container);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--obsidian-raised);
    border: 1px solid var(--obsidian-line);
    border-radius: var(--radius);
    padding: 0.5rem;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: all 200ms ease;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    z-index: 20;
  }
  .nav-links.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }
  .nav-links a {
    padding: 0.85rem 1rem;
    font-size: 1rem;
    border-radius: var(--radius);
  }
  .nav-links a:hover { background: var(--obsidian-black); }
  .nav-links a.nav-cta {
    border: 1px solid var(--amber);
    text-align: center;
    margin-top: 0.25rem;
  }
  .nav { padding: 1.25rem var(--pad-container); position: relative; }
}

/* ── Hero ────────────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 94vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  isolation: isolate;
}
.hero-media { position: absolute; inset: 0; z-index: -1; }
.hero-media img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.hero-overlay {
  position: absolute; inset: 0;
  background:
    linear-gradient(100deg, rgba(10,10,10,0.85) 0%, rgba(10,10,10,0.55) 45%, rgba(10,10,10,0.25) 100%),
    linear-gradient(180deg, rgba(10,10,10,0.4) 0%, rgba(10,10,10,0.1) 40%, rgba(10,10,10,0.6) 100%);
}
.hero-content {
  position: relative;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--pad-container);
  padding-top: 10vh;
}
.hero-title {
  font-size: clamp(2.5rem, 5.5vw, 4.5rem);
  max-width: 20ch;
  margin-bottom: 1.5rem;
}
.hero-title .accent {
  background: linear-gradient(135deg, var(--amber-bright) 0%, var(--teal-bright) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  max-width: 52ch;
  color: var(--warm-white-soft);
  margin-bottom: 2.5rem;
}
.hero-ctas { display: flex; gap: 1rem; flex-wrap: wrap; }

/* ── Buttons ─────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.75rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: all 200ms ease;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn-primary {
  background: linear-gradient(135deg, var(--amber) 0%, #a07f4c 100%);
  color: var(--obsidian-black);
  font-weight: 600;
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--amber-bright) 0%, var(--amber) 100%);
  color: var(--obsidian-black);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(184, 147, 92, 0.25);
}
.btn-ghost {
  background: transparent;
  border-color: var(--obsidian-line);
  color: var(--warm-white);
}
.btn-ghost:hover {
  border-color: var(--teal);
  color: var(--teal-bright);
}
.btn-large { padding: 1.15rem 2.25rem; font-size: 1.05rem; }

/* ── Sections ────────────────────────────────────────────────────── */
.section { padding: var(--pad-section) 0; }
.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--amber);
  margin-bottom: 1rem;
}
.section-title {
  font-size: clamp(2rem, 4vw, 3.25rem);
  max-width: 24ch;
  margin-bottom: 2rem;
}
.section-lede {
  font-size: 1.15rem;
  color: var(--warm-white-soft);
  max-width: 60ch;
  margin-bottom: 3rem;
}
.section-lede strong {
  color: var(--amber-bright);
  font-weight: 600;
}

/* ── Legal pages ─────────────────────────────────────────────────── */
.legal-page {
  padding: calc(var(--pad-section) + 5rem) 0 var(--pad-section);
  min-height: 100vh;
}
.legal-page .container { max-width: 780px; }
.legal-page h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 0.5rem;
}
.legal-page .legal-updated {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 2.5rem;
}
.legal-page h2 {
  font-size: 1.4rem;
  margin: 2.5rem 0 0.75rem;
  color: var(--amber-bright);
}
.legal-page p, .legal-page li {
  color: var(--warm-white-soft);
  font-size: 1rem;
  line-height: 1.7;
}
.legal-page ul { padding-left: 1.25rem; }
.legal-page a { color: var(--teal-bright); }
.legal-page a:hover { color: var(--amber-bright); }

/* ── Blog ────────────────────────────────────────────────────────── */
.blog-index {
  padding: calc(var(--pad-section) + 5rem) 0 var(--pad-section);
}
.blog-index .container { max-width: 860px; }
/* Blog controls (search + category buttons) */
.blog-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 0 1rem;
  border-bottom: 1px solid var(--obsidian-line);
  margin-top: 2rem;
}
.blog-search {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--obsidian-raised);
  border: 1px solid var(--obsidian-line);
  border-radius: var(--radius);
  padding: 0.6rem 1rem;
  flex: 1 1 240px;
  max-width: 360px;
  transition: border-color 200ms ease;
}
.blog-search:focus-within { border-color: var(--amber); }
.blog-search .search-icon { color: var(--muted); flex-shrink: 0; }
.blog-search input {
  border: none;
  background: transparent;
  color: var(--warm-white);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  outline: none;
  width: 100%;
}
.blog-search input::placeholder { color: var(--muted-dim); }

.blog-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.category-btn {
  background: transparent;
  border: 1px solid var(--obsidian-line);
  color: var(--warm-white-soft);
  padding: 0.5rem 0.95rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 180ms ease;
}
.category-btn:hover { border-color: var(--amber); color: var(--amber-bright); }
.category-btn.active {
  background: linear-gradient(135deg, var(--amber) 0%, #a07f4c 100%);
  color: var(--obsidian-black);
  border-color: var(--amber);
  font-weight: 600;
}

.blog-count {
  margin-top: 1.25rem;
  color: var(--muted);
  font-size: 0.85rem;
  font-style: italic;
}
.blog-empty {
  text-align: center;
  padding: 4rem 0;
  color: var(--muted);
}

/* Blog item cards */
.blog-list {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0 0 0;
}
.blog-list li {
  padding: 2rem 0;
  border-bottom: 1px solid var(--obsidian-line);
}
.blog-list li:last-child { border-bottom: none; }
.blog-item-link {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 2rem;
  align-items: start;
  color: inherit;
}
.blog-item-link:hover .blog-thumb { opacity: 0.95; transform: translateY(-1px); }
.blog-item-link:hover h3 { color: var(--amber-bright); }
.blog-thumb {
  width: 260px;
  height: 146px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--obsidian-line);
  transition: all 250ms ease;
}
.blog-item-body { min-width: 0; }
.blog-list .blog-date {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--amber);
  margin-bottom: 0.5rem;
}
.blog-list h3 {
  font-size: 1.5rem;
  margin: 0 0 0.75rem 0;
  font-family: var(--font-serif);
  font-weight: 500;
  color: var(--warm-white);
  transition: color 180ms ease;
}
.blog-list .blog-excerpt {
  color: var(--warm-white-soft);
  margin: 0 0 1rem 0;
  font-size: 0.975rem;
}

.blog-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}
.blog-tag {
  font-size: 0.72rem;
  text-transform: lowercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  background: var(--obsidian-raised);
  border: 1px solid var(--obsidian-line);
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all 160ms ease;
}
.blog-tag:hover { color: var(--amber-bright); border-color: var(--amber); }
.blog-tag.active { background: var(--amber); color: var(--obsidian-black); border-color: var(--amber); font-weight: 600; }

@media (max-width: 720px) {
  .blog-item-link { grid-template-columns: 1fr; gap: 1rem; }
  .blog-thumb { width: 100%; height: auto; aspect-ratio: 16/9; }
  .blog-controls { flex-direction: column; align-items: stretch; }
  .blog-search { max-width: none; }
}

.blog-post {
  padding: calc(var(--pad-section) + 5rem) 0 var(--pad-section);
}
.blog-post .container { max-width: 720px; }
.blog-post .post-hero {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  margin-bottom: 2.5rem;
  border: 1px solid var(--obsidian-line);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}
.blog-post .post-mid-figure {
  margin: 3rem 0 2.5rem;
}
.blog-post .post-mid-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--obsidian-line);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}
.blog-post .post-mid-figure figcaption {
  margin-top: 1rem;
  text-align: center;
  font-style: italic;
  color: var(--muted);
  font-family: var(--font-serif);
  font-size: 0.95rem;
}
.blog-post .post-lede {
  font-size: 1.25rem;
  line-height: 1.65;
  color: var(--warm-white);
  font-family: var(--font-serif);
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--obsidian-line);
}
.blog-post .post-meta {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--amber);
  margin-bottom: 1rem;
}
.post-sources {
  list-style: none;
  padding: 0;
  margin-top: 1rem;
}
.post-sources li {
  padding: 0.5rem 0;
  font-size: 0.95rem;
  color: var(--muted);
}
.post-sources a { color: var(--teal-bright); }
.blog-post h1 {
  font-size: clamp(2rem, 4.2vw, 2.8rem);
  margin-bottom: 2.5rem;
  line-height: 1.2;
}
.blog-post h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 1rem;
  color: var(--warm-white);
}
.blog-post p, .blog-post li {
  font-size: 1.08rem;
  line-height: 1.75;
  color: var(--warm-white-soft);
  margin-bottom: 1.25rem;
}
.blog-post blockquote {
  border-left: 3px solid var(--amber);
  padding: 0.5rem 0 0.5rem 1.5rem;
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--warm-white);
  font-size: 1.15rem;
  margin: 2rem 0;
}
.blog-post a { color: var(--teal-bright); }
.blog-post .back-link {
  display: inline-block;
  margin-top: 3rem;
  color: var(--muted);
  font-size: 0.9rem;
}
.blog-post .back-link:hover { color: var(--amber-bright); }

/* ── Thesis ──────────────────────────────────────────────────────── */
.section-thesis { background: linear-gradient(180deg, var(--obsidian-black) 0%, var(--obsidian-raised) 100%); border-top: 1px solid var(--obsidian-line); }
.thesis-quote {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.2vw, 1.7rem);
  line-height: 1.45;
  max-width: 62ch;
  color: var(--warm-white);
  padding: 2rem 0 2rem 2rem;
  border-left: 3px solid var(--amber);
  margin: 0 0 2.5rem 0;
  font-style: italic;
}
.thesis-quote cite {
  display: block;
  margin-top: 1.25rem;
  font-size: 0.95rem;
  font-style: normal;
  font-family: var(--font-sans);
  color: var(--muted);
  letter-spacing: 0.02em;
}
.thesis-body {
  max-width: 62ch;
  color: var(--warm-white-soft);
  font-size: 1.1rem;
}
.thesis-body em { color: var(--amber-bright); font-style: italic; }

/* ── Services ────────────────────────────────────────────────────── */
.section-services { background: var(--obsidian-raised); border-top: 1px solid var(--obsidian-line); }
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}
.service {
  background: var(--obsidian-black);
  border: 1px solid var(--obsidian-line);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
  transition: all 250ms ease;
}
.service:hover {
  border-color: var(--amber);
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(184, 147, 92, 0.08);
}
.service-icon {
  font-size: 1.5rem;
  color: var(--amber);
  margin-bottom: 1rem;
  display: inline-block;
}
.service h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  color: var(--warm-white);
}
.service p {
  color: var(--warm-white-soft);
  font-size: 0.975rem;
  margin: 0;
}
.service code {
  background: rgba(184, 147, 92, 0.1);
  color: var(--amber-bright);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-size: 0.85em;
}

/* ── About ───────────────────────────────────────────────────────── */
.section-about {
  background: linear-gradient(180deg, var(--obsidian-raised) 0%, var(--obsidian-black) 100%);
  border-top: 1px solid var(--obsidian-line);
}
.about-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 4rem;
  align-items: start;
}
.about-copy p {
  color: var(--warm-white-soft);
  font-size: 1.05rem;
  margin: 0 0 1.25rem 0;
  max-width: 58ch;
}
.about-portrait {
  text-align: center;
  position: sticky;
  top: 2rem;
}
.about-portrait img {
  width: 100%;
  max-width: 320px;
  height: auto;
  border-radius: 50%;
  border: 3px solid var(--obsidian-line);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6), 0 0 0 8px rgba(184, 147, 92, 0.06);
  margin: 0 auto;
  display: block;
  background: var(--obsidian-raised);
}
.about-portrait-caption {
  margin: 1.25rem 0 0 0;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--amber);
}
@media (max-width: 860px) {
  .about-grid { grid-template-columns: 1fr; gap: 3rem; }
  .about-portrait { position: static; max-width: 260px; margin: 0 auto; }
}

/* ── Contact ─────────────────────────────────────────────────────── */
.section-contact {
  background: var(--obsidian-black);
  border-top: 1px solid var(--obsidian-line);
  text-align: center;
}
.section-contact .section-title,
.section-contact .section-label,
.section-contact .section-lede { margin-left: auto; margin-right: auto; }
.contact-actions { margin: 3rem 0 1.5rem; }
.contact-footnote { color: var(--muted); font-size: 0.9rem; }

/* ── Footer ──────────────────────────────────────────────────────── */
.footer {
  background: var(--obsidian-black);
  border-top: 1px solid var(--obsidian-line);
  padding: 2.5rem 0 2rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 2fr;
  gap: 2rem;
  align-items: center;
}
.footer-brand { color: var(--warm-white); font-weight: 600; margin: 0 0 0.25rem 0; }
.footer-sub { color: var(--muted); font-size: 0.9rem; margin: 0; }
.footer-links { display: flex; gap: 1.5rem; justify-content: center; }
.footer-links a { color: var(--muted); font-size: 0.9rem; }
.footer-links a:hover { color: var(--amber-bright); }
.footer-meta { color: var(--muted-dim); font-size: 0.8rem; text-align: right; }
@media (max-width: 720px) {
  .footer-grid { grid-template-columns: 1fr; text-align: center; gap: 1.25rem; }
  .footer-links { justify-content: center; }
  .footer-meta { text-align: center; }
}

/* ── Motion respect ──────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}