/* ============================================================
   DOUG MITCHELL — PERSONAL SITE
   Single shared stylesheet. Edit variables below to retheme.
   ============================================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:ital,opsz,wght@0,8..60,300..900;1,8..60,300..900&family=Inter:wght@300;400;500;600&display=swap');

/* ---- COLOR & TYPOGRAPHY VARIABLES ---- */
:root {
  --color-bg:          #FAF8F4;
  --color-bg-alt:      #F3EFE8;
  --color-text:        #1A1A1A;
  --color-text-muted:  #5C5A56;
  --color-accent:      #0F4C4C;
  --color-accent-hover:#0d3e3e;
  --color-border:      #DDD9D0;
  --color-card-bg:     #FFFFFF;

  --font-heading: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-body:    'Inter', system-ui, -apple-system, sans-serif;

  --max-width:     1100px;
  --content-width: 760px;
  --gap:           clamp(1.5rem, 4vw, 3rem);
  --section-gap:   clamp(3rem, 8vw, 6rem);
}

/* ---- RESET & BASE ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  transition: color 0.2s, text-decoration-color 0.2s;
}
a:hover {
  color: var(--color-accent-hover);
  text-decoration-color: currentColor;
}
a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---- TYPOGRAPHY ---- */
h1, h2, h3, h4, h5 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.4rem); }

p { max-width: 68ch; }

strong { font-weight: 600; }

/* ---- LAYOUT HELPERS ---- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 2.5rem);
}

.content-width {
  max-width: var(--content-width);
}

/* ---- HEADER & NAV ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 248, 244, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1rem;
}

.site-logo {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.01em;
  flex-shrink: 0;
}
.site-logo:hover { color: var(--color-accent); text-decoration: none; }

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
  align-items: center;
}

.site-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color 0.2s;
}
.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--color-accent);
}

/* ---- FOOTER ---- */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  padding-block: 2.5rem;
  margin-top: var(--section-gap);
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
}

.footer-info p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  max-width: none;
  line-height: 1.6;
}
.footer-info a { color: var(--color-text-muted); }
.footer-info a:hover { color: var(--color-accent); }

.footer-meta {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-align: right;
}
.footer-meta p { max-width: none; }

/* ---- HERO (home) ---- */
.hero {
  padding-block: clamp(3.5rem, 10vw, 7rem);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  align-items: center;
}

@media (min-width: 700px) {
  .hero-inner {
    grid-template-columns: 1fr auto;
  }
}

.hero-tagline {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 400;
  font-style: italic;
  line-height: 1.3;
  color: var(--color-text);
  max-width: 28ch;
  margin-bottom: 1.5rem;
}

.hero-intro {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  max-width: 60ch;
}

/* Headshot placeholder */
.headshot-placeholder {
  width: clamp(140px, 22vw, 220px);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: var(--color-bg-alt);
  border: 2px dashed var(--color-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  text-align: center;
  padding: 1rem;
  flex-shrink: 0;
}
.headshot-placeholder span { font-size: 2rem; display: block; }

/* ---- SECTION LABEL ---- */
.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1rem;
}

/* ---- CARD GRID ---- */
section { padding-block: var(--section-gap); }
section + section { padding-top: 0; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.75rem;
  transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover {
  box-shadow: 0 4px 20px rgba(15, 76, 76, 0.08);
  transform: translateY(-2px);
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.6rem;
}

.card-body {
  font-size: 0.925rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: none;
}

.card-link {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
  text-decoration: none;
}
.card-link:hover { text-decoration: underline; }

/* ---- CREDIBILITY STRIP ---- */
.cred-strip {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding-block: 1.5rem;
  margin-top: var(--section-gap);
}

.cred-strip-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  align-items: center;
  justify-content: center;
}

.cred-item {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.cred-separator {
  color: var(--color-border);
  user-select: none;
}

/* ---- FAQ ---- */
.faq-list {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--color-border);
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding-block: 1.5rem;
}

.faq-question {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.6rem;
}

.faq-answer {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  max-width: 65ch;
}

/* ---- CTA CLOSING LINE ---- */
.cta-line {
  margin-top: var(--section-gap);
  padding-top: var(--section-gap);
  border-top: 1px solid var(--color-border);
  font-size: 1.05rem;
  color: var(--color-text-muted);
}

/* ---- PAGE HEADER (inner pages) ---- */
.page-header {
  padding-block: clamp(2.5rem, 7vw, 5rem);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--section-gap);
}

.page-header-eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.page-header-eyebrow a {
  color: var(--color-text-muted);
  text-decoration: none;
}
.page-header-eyebrow a:hover { color: var(--color-accent); }
.page-header-eyebrow .sep { color: var(--color-border); }

/* ---- ABOUT PAGE ---- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  align-items: start;
}

@media (min-width: 700px) {
  .about-grid {
    grid-template-columns: 1fr auto;
  }
}

.bio-section { margin-bottom: var(--gap); }
.bio-section h2 { margin-bottom: 1.25rem; }
.bio-section p + p { margin-top: 1rem; }

/* Education list */
.credential-list {
  list-style: none;
  margin-top: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.credential-list li {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  font-size: 0.95rem;
}
.credential-list li::before {
  content: "—";
  color: var(--color-accent);
  flex-shrink: 0;
}

/* Books list */
.book-list {
  list-style: none;
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.book-item {
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--color-border);
}
.book-item:last-child { border-bottom: none; }

.book-title {
  font-family: var(--font-heading);
  font-weight: 600;
  font-style: italic;
  color: var(--color-accent);
  font-size: 1.05rem;
}

.book-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
  max-width: none;
}

/* ---- CONTACT BLOCK ---- */
.contact-block {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.75rem;
  margin-top: var(--gap);
}
.contact-block p { font-size: 0.95rem; color: var(--color-text-muted); max-width: none; }

/* ---- PROJECT DETAIL ---- */
.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  margin-bottom: 1.5rem;
}
.project-meta-item {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}
.project-meta-item strong { color: var(--color-text); }

.project-tagline {
  font-family: var(--font-heading);
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 400;
  font-style: italic;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
}

.project-section {
  margin-bottom: 2.5rem;
}
.project-section h3 {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}
.project-section p { color: var(--color-text-muted); font-size: 1rem; }

.status-badge {
  display: inline-block;
  background: rgba(15, 76, 76, 0.08);
  color: var(--color-accent);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.3em 0.8em;
  border-radius: 100px;
  border: 1px solid rgba(15, 76, 76, 0.2);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--color-accent);
  color: #fff;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.75em 1.5em;
  border-radius: 6px;
  text-decoration: none;
  transition: background 0.2s;
  margin-top: 1.5rem;
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
  text-decoration: none;
}
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: transparent;
  color: var(--color-accent);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.75em 1.5em;
  border-radius: 6px;
  border: 1.5px solid var(--color-accent);
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
  margin-top: 1.5rem;
  margin-left: 0.75rem;
}
.btn-secondary:hover {
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
}

/* ---- BREADCRUMB ---- */
.breadcrumb {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  align-items: center;
  margin-bottom: 0.5rem;
}
.breadcrumb a { color: var(--color-text-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--color-accent); }
.breadcrumb .sep { color: var(--color-border); }

/* ---- DIVIDER ---- */
.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin-block: var(--gap);
}

/* ---- RESPONSIVE ---- */
@media (max-width: 600px) {
  .site-nav ul { gap: 1.25rem; }
  .footer-meta { text-align: left; }
  .project-meta { flex-direction: column; gap: 0.25rem; }
}

@media (max-width: 480px) {
  .cred-separator { display: none; }
  .cred-strip-inner { gap: 0.4rem 1rem; }
}

/* ---- FOOTER NAV ---- */
.footer-nav-links nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.footer-nav-links nav a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-decoration: none;
}
.footer-nav-links nav a:hover { color: var(--color-accent); }

/* ---- COURSE LIST (academic page) ---- */
.course-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--color-border);
}

.course-item {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 1.5rem;
  padding-block: 1.75rem;
  border-bottom: 1px solid var(--color-border);
  align-items: start;
}

@media (max-width: 560px) {
  .course-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
}

.course-code {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  padding-top: 0.2rem;
  white-space: nowrap;
}

.course-title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.course-desc {
  font-size: 0.925rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: 65ch;
}

/* ---- RESEARCH LIST (academic page) ---- */
.research-list {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  margin-top: 2rem;
}

.research-item {
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--color-border);
}
.research-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.research-title {
  font-family: var(--font-heading);
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}

.research-body {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.75;
  max-width: 68ch;
}

/* ---- DARK MODE ---- */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg:          #18181B;
    --color-bg-alt:      #222225;
    --color-text:        #EDEAE4;
    --color-text-muted:  #A09C96;
    --color-accent:      #2FA8A8;
    --color-accent-hover:#3DBDBD;
    --color-border:      #38383C;
    --color-card-bg:     #222225;
  }

  .site-header {
    background: rgba(24, 24, 27, 0.95);
  }

  .card:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  }

  .status-badge {
    background: rgba(47, 168, 168, 0.12);
    border-color: rgba(47, 168, 168, 0.3);
  }

  .btn-primary {
    background: var(--color-accent);
  }
  .btn-primary:hover {
    background: var(--color-accent-hover);
  }
}

/* ---- GET IN TOUCH CTA ---- */
.cta-get-in-touch {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: clamp(2rem, 5vw, 3rem);
  text-align: center;
}

.cta-get-in-touch h2 {
  margin-bottom: 0.75rem;
}

.cta-get-in-touch p {
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-inline: auto;
  margin-bottom: 1.5rem;
}

.cta-email-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-accent);
  color: #fff !important;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  padding: 0.8em 1.75em;
  border-radius: 6px;
  text-decoration: none !important;
  transition: background 0.2s;
}
.cta-email-link:hover {
  background: var(--color-accent-hover);
  color: #fff !important;
  text-decoration: none !important;
}

/* Inline mailto CTA on inner pages */
.inline-cta {
  margin-top: var(--section-gap);
  padding-top: var(--gap);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  justify-content: space-between;
}

.inline-cta p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  max-width: none;
}

/* ---- 404 PAGE ---- */
.not-found-section {
  padding-block: clamp(4rem, 12vw, 8rem);
  text-align: center;
}

.not-found-code {
  font-family: var(--font-heading);
  font-size: clamp(4rem, 15vw, 8rem);
  font-weight: 700;
  color: var(--color-border);
  line-height: 1;
  margin-bottom: 0.25rem;
}

.not-found-section h1 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin-bottom: 1rem;
}

.not-found-section p {
  color: var(--color-text-muted);
  max-width: 44ch;
  margin-inline: auto;
  margin-bottom: 2rem;
}

/* OG image placeholder note */
.og-placeholder-note {
  display: inline-block;
  background: rgba(255, 200, 50, 0.15);
  border: 1px dashed #cc9900;
  color: #7a5c00;
  font-size: 0.75rem;
  padding: 0.25em 0.6em;
  border-radius: 4px;
  font-family: var(--font-body);
}