/* ========================================
   Daniel J. Merritt — Personal Site
   Modern, clean, responsive design
   ======================================== */

:root {
  --color-bg: #0f0f0f;
  --color-surface: #1a1a1a;
  --color-surface-2: #242424;
  --color-border: #2a2a2a;
  --color-text: #e4e4e7;
  --color-text-muted: #a1a1aa;
  --color-accent: #6366f1;
  --color-accent-hover: #818cf8;
  --color-accent-subtle: rgba(99, 102, 241, 0.1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 900px;
  --radius: 12px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-accent-hover);
}

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

/* ── Navigation ──────────────────────── */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 15, 15, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
}

.navbar .container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.navbar__logo {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.navbar__logo span {
  color: var(--color-accent);
}

.navbar__links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.navbar__links a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
}

.navbar__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}

.navbar__links a:hover,
.navbar__links a.active {
  color: var(--color-text);
}

.navbar__links a:hover::after,
.navbar__links a.active::after {
  width: 100%;
}

/* Mobile nav toggle */
.navbar__toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 640px) {
  .navbar__toggle {
    display: block;
  }
  .navbar__links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    border-bottom: 1px solid var(--color-border);
  }
  .navbar__links.open {
    display: flex;
  }
}

/* ── Layout ──────────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

main {
  padding: 3rem 0 5rem;
}

section {
  margin-bottom: 4rem;
}

/* ── Hero ────────────────────────────── */
.hero {
  padding: 4rem 0 3rem;
  text-align: center;
}

.hero__greeting {
  font-size: 0.9rem;
  color: var(--color-accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.hero__name {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.hero__title {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  font-weight: 400;
  margin-bottom: 1.5rem;
}

.hero__links {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.5rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

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

.btn--primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
  transform: translateY(-1px);
}

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-1px);
}

/* ── Section Headings ────────────────── */
.section__header {
  margin-bottom: 2rem;
}

.section__label {
  font-size: 0.8rem;
  color: var(--color-accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.section__title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* ── Cards ───────────────────────────── */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color var(--transition), transform var(--transition);
}

.card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

/* ── Experience / Timeline ───────────── */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.timeline__item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 1.5rem;
  align-items: start;
}

.timeline__date {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  padding-top: 0.15rem;
}

.timeline__content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.timeline__content .company {
  color: var(--color-accent);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

.timeline__content p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

@media (max-width: 640px) {
  .timeline__item {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
}

/* ── Skills ──────────────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.skill-category h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  display: inline-block;
  padding: 0.3rem 0.75rem;
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 500;
}

/* ── Projects ────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color var(--transition), transform var(--transition);
}

.project-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.project-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.project-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

/* ── Blog ────────────────────────────── */
.blog-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.blog-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color var(--transition), transform var(--transition);
  color: var(--color-text);
}

.blog-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  color: var(--color-text);
}

.blog-card__meta {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  margin-bottom: 0.5rem;
}

.blog-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.blog-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* ── Blog Post (article page) ────────── */
.post {
  max-width: 720px;
  margin: 0 auto;
}

.post__header {
  margin-bottom: 2.5rem;
}

.post__meta {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  margin-bottom: 0.75rem;
}

.post__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.post__body h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 2rem 0 1rem;
}

.post__body h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 1.5rem 0 0.75rem;
}

.post__body p {
  margin-bottom: 1.25rem;
  color: var(--color-text-muted);
}

.post__body ul, .post__body ol {
  margin: 0 0 1.25rem 1.25rem;
  color: var(--color-text-muted);
}

.post__body li {
  margin-bottom: 0.4rem;
}

.post__body code {
  background: var(--color-surface-2);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.88em;
}

.post__body pre {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

.post__body pre code {
  background: none;
  padding: 0;
}

.post__body blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: 1.25rem;
  margin: 1.5rem 0;
  color: var(--color-text-muted);
  font-style: italic;
}

/* ── About page ──────────────────────── */
.about-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.about-content p {
  color: var(--color-text-muted);
  font-size: 1rem;
  line-height: 1.8;
}

/* ── Contact ─────────────────────────── */
.contact-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ── Footer ──────────────────────────── */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  text-align: center;
}

.footer p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ── Utilities ───────────────────────── */
.text-muted { color: var(--color-text-muted); }
.text-accent { color: var(--color-accent); }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }