/* ============================================
   Daniel Sharp - Personal Site
   Dark-first, terminal-inspired design
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  --bg: #0d1117;
  --bg-secondary: #161b22;
  --text: #e6edf3;
  --text-secondary: #8b949e;
  --accent: #00d4aa;
  --accent-hover: #00f5c4;
  --border: #30363d;
  --code-bg: #1a1f2b;
  --shadow: rgba(0, 0, 0, 0.3);
  --card-hover: #1c2333;
}

[data-theme="light"] {
  --bg: #fafbfc;
  --bg-secondary: #ffffff;
  --text: #1f2328;
  --text-secondary: #656d76;
  --accent: #00896e;
  --accent-hover: #006d58;
  --border: #d0d7de;
  --code-bg: #f0f2f4;
  --shadow: rgba(0, 0, 0, 0.08);
  --card-hover: #f0f4f8;
}

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

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background-color 0.3s ease, color 0.3s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-weight: 700;
  line-height: 1.3;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.75rem; margin-bottom: 1rem; }
h3 { font-size: 1.25rem; margin-bottom: 0.75rem; }

code, pre {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

/* --- Layout --- */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

.container--wide {
  max-width: 1000px;
}

/* --- Header / Nav --- */
.site-header {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background-color: var(--bg);
  z-index: 100;
  backdrop-filter: blur(10px);
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-logo {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

.site-logo:hover {
  color: var(--accent);
}

.site-logo .prompt {
  color: var(--accent);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.site-nav a {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: var(--text-secondary);
  position: relative;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--accent);
}

.site-nav a::before {
  content: '>';
  margin-right: 0.3rem;
  color: var(--accent);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.site-nav a:hover::before,
.site-nav a.active::before {
  opacity: 1;
}

/* Theme toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.4rem 0.5rem;
  border-radius: 6px;
  font-size: 1rem;
  line-height: 1;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Mobile nav */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.25rem;
}

/* --- Hero (Landing Page) --- */
.hero {
  min-height: calc(100vh - 73px);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.hero-content {
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-name {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.hero-cursor {
  display: inline-block;
  width: 3px;
  height: 1em;
  background-color: var(--accent);
  margin-left: 4px;
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  color: var(--accent);
  margin-bottom: 1.5rem;
  font-weight: 400;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 550px;
  margin: 0 auto 2.5rem;
  line-height: 1.8;
}

.hero-nav {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.hero-nav-link {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  transition: all 0.2s ease;
}

.hero-nav-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  background-color: var(--bg-secondary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
}

.hero-nav-link .arrow {
  color: var(--accent);
  margin-right: 0.4rem;
}

.hero-social {
  display: flex;
  gap: 1.25rem;
  justify-content: center;
}

.hero-social a {
  color: var(--text-secondary);
  transition: color 0.2s ease, transform 0.2s ease;
  display: flex;
  align-items: center;
}

.hero-social a:hover {
  color: var(--accent);
  transform: translateY(-2px);
}

.hero-social svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

/* Circuit trace decoration */
.circuit-decoration {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  pointer-events: none;
  opacity: 0.04;
}

.circuit-decoration line {
  stroke: var(--accent);
  stroke-width: 1;
}

.circuit-decoration circle {
  fill: var(--accent);
}

/* --- Page Content --- */
.page-content {
  flex: 1;
  padding: 3rem 0;
}

.page-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.page-header h1 {
  margin-bottom: 0.5rem;
}

.page-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* --- About Page --- */
.about-content {
  font-size: 1.05rem;
}

.about-content p {
  margin-bottom: 1.25rem;
}

.about-content h2 {
  margin-top: 2.5rem;
}

.cv-download {
  margin: 2rem 0;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-secondary);
}

.cv-download h3 {
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.cv-download h3::before {
  content: '// ';
  opacity: 0.5;
}

.cv-download p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

.cv-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  background: var(--accent);
  color: var(--bg);
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition: opacity 0.2s;
}

.cv-download-btn:hover {
  opacity: 0.85;
  color: var(--bg);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

.about-section {
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-secondary);
}

.about-section h3 {
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.about-section h3::before {
  content: '// ';
  opacity: 0.5;
}

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

.skill-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  padding: 0.25rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-secondary);
}

/* --- Project & Blog Cards --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.card {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  transition: all 0.2s ease;
  background: var(--bg-secondary);
  display: flex;
  flex-direction: column;
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px var(--shadow);
  background: var(--card-hover);
}

.card-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-bottom: 1px solid var(--border);
}

.card-body {
  padding: 1.25rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.card-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  color: var(--text);
  line-height: 1.4;
}

.card-summary {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
}

.card-footer {
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--border);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
}

.card-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.external-icon {
  width: 14px;
  height: 14px;
  opacity: 0.6;
}

/* --- Blog Post Page --- */
.post-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.post-meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.post-header h1 {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.post-summary {
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-style: italic;
}

.post-content {
  font-size: 1.05rem;
}

.post-content h2 {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.post-content h3 {
  margin-top: 2rem;
}

.post-content p {
  margin-bottom: 1.25rem;
}

.post-content ul, .post-content ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

.post-content li {
  margin-bottom: 0.5rem;
}

.post-content pre {
  background: var(--code-bg);
  padding: 1.25rem;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border);
  font-size: 0.85rem;
  line-height: 1.6;
}

.post-content code {
  font-size: 0.85em;
}

.post-content p code,
.post-content li code {
  background: var(--code-bg);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.post-content img {
  border-radius: 8px;
  border: 1px solid var(--border);
  margin: 1rem 0;
}

.post-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  color: var(--text-secondary);
  margin: 1.5rem 0;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.85rem;
  overflow-x: auto;
  display: block;
}

.post-content th,
.post-content td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  text-align: left;
}

.post-content th {
  background: var(--bg-secondary);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
}

.post-content .output {
  background: var(--code-bg);
  padding: 1rem 1.25rem;
  border-radius: 8px;
  margin-bottom: 1.5rem;
  border-left: 3px solid var(--accent);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  white-space: pre-wrap;
  overflow-x: auto;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  margin-bottom: 2rem;
  color: var(--text-secondary);
}

.back-link:hover {
  color: var(--accent);
}

/* --- Footer --- */
.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-text {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  gap: 1rem;
}

.footer-links a {
  color: var(--text-secondary);
  display: flex;
  align-items: center;
}

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

.footer-links svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1rem 1.5rem;
    gap: 0.75rem;
  }

  .site-nav.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .hero-name {
    font-size: 2.5rem;
  }

  .hero-nav {
    flex-direction: column;
    align-items: center;
  }

  .hero-nav-link {
    width: 100%;
    max-width: 280px;
    text-align: center;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .site-footer .container {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-name {
    font-size: 2rem;
  }

  .container {
    padding: 0 1rem;
  }
}