/* =========================================
   Owen's Portfolio — Engineering Notebook
   ========================================= */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:ital,wght@0,400;0,500;0,600;0,700;1,400&family=Instrument+Serif&display=swap');

/* --- Tokens --- */
:root {
  --paper:      #f5f0e8;
  --paper-dark: #ece6da;
  --grid-line:  rgba(86, 166, 112, 0.18);
  --grid-heavy: rgba(86, 166, 112, 0.35);
  --ink:        #1a1a1a;
  --ink-mid:    #3d3d38;
  --ink-light:  #6b6b62;
  --red-ink:    #b03a30;
  --blue-ink:   #2d5a8a;
  --pencil:     #6a6a60;
  --highlight:  rgba(255, 230, 100, 0.4);
  --mono:       'IBM Plex Mono', monospace;
  --serif:      'Instrument Serif', Georgia, serif;
  --grid-sm:    20px;
  --grid-lg:    100px;
}

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

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

body {
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 400;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
  overflow-x: hidden;

  /* Engineering paper grid */
  background-image:
    linear-gradient(var(--grid-heavy) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-heavy) 1px, transparent 1px),
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size:
    var(--grid-lg) var(--grid-lg),
    var(--grid-lg) var(--grid-lg),
    var(--grid-sm) var(--grid-sm),
    var(--grid-sm) var(--grid-sm);
  background-position: -1px -1px;
}

a {
  color: var(--blue-ink);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}
a:hover { color: var(--red-ink); }

/* --- Layout --- */
.container {
  max-width: 840px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* --- Margin line (left red rule) --- */
body::before {
  content: '';
  position: fixed;
  top: 0;
  bottom: 0;
  left: calc((100vw - 840px) / 2 + 2rem - 20px);
  width: 2px;
  background: rgba(176, 58, 48, 0.25);
  z-index: 10;
  pointer-events: none;
}

@media (max-width: 900px) {
  body::before { left: 12px; }
}

/* --- Header / Nav --- */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(245, 240, 232, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--grid-heavy);
}

nav {
  max-width: 840px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-name {
  font-family: var(--serif);
  font-size: 1.35rem;
  color: var(--ink);
  font-weight: 400;
}

.nav-links {
  display: flex;
  gap: 1.75rem;
  list-style: none;
}

.nav-links a {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--ink-mid);
  letter-spacing: 0.02em;
}
.nav-links a:hover { color: var(--red-ink); }


/* =========================================
   Landing / Fork Page
   ========================================= */

.landing {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.landing-card {
  max-width: 520px;
  width: 100%;
  text-align: center;
}

.landing-card h1 {
  font-family: var(--serif);
  font-size: 2.8rem;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 0.5rem;
}

.landing-card .tagline {
  font-size: 0.85rem;
  color: var(--ink-mid);
  margin-bottom: 3rem;
}

.landing-paths {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.landing-path {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem 1.5rem;
  border: 2px solid var(--grid-heavy);
  border-radius: 6px;
  background: rgba(245, 240, 232, 0.6);
  color: inherit;
  font-weight: 400;
  transition: all 0.25s;
  cursor: pointer;
}

.landing-path:hover {
  border-color: rgba(86, 166, 112, 0.6);
  background: rgba(255, 230, 100, 0.12);
  transform: translateY(-2px);
}

.landing-path .path-icon {
  font-size: 1.6rem;
  margin-bottom: 0.75rem;
  line-height: 1;
}

.landing-path h2 {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 400;
  margin-bottom: 0.35rem;
  color: var(--ink);
}

.landing-path p {
  font-size: 0.76rem;
  color: var(--ink-mid);
  line-height: 1.6;
}

.landing-path .path-arrow {
  margin-top: 1rem;
  font-size: 0.78rem;
  color: var(--blue-ink);
  font-weight: 500;
}

.landing-footer {
  font-size: 0.72rem;
  color: var(--ink-light);
}

.landing-footer a {
  color: var(--ink-light);
  font-weight: 400;
  text-decoration: underline;
  text-decoration-color: rgba(107, 107, 98, 0.3);
  text-underline-offset: 2px;
}
.landing-footer a:hover { color: var(--red-ink); }

@media (max-width: 480px) {
  .landing-paths { grid-template-columns: 1fr; }
  .landing-card h1 { font-size: 2.2rem; }
}


/* =========================================
   Content Pages (shared)
   ========================================= */

/* --- Hero --- */
.hero {
  padding: 8.5rem 0 4rem;
}

.hero-label {
  font-size: 0.76rem;
  color: var(--ink-light);
  font-weight: 500;
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(2.4rem, 5.5vw, 3.6rem);
  font-weight: 400;
  line-height: 1.15;
  color: var(--ink);
  margin-bottom: 1.5rem;
  letter-spacing: -0.01em;
}

.hero-intro {
  font-size: 0.9rem;
  color: var(--ink-mid);
  max-width: 580px;
  line-height: 1.85;
}

.hero-intro strong {
  color: var(--ink);
  font-weight: 600;
}

/* Highlight marker effect */
.marker {
  background: var(--highlight);
  padding: 0 3px;
  margin: 0 -3px;
}

/* --- Status tags --- */
.status-bar {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.status-tag {
  font-size: 0.74rem;
  font-weight: 500;
  padding: 0.3rem 0.65rem;
  border: 1px solid rgba(86, 166, 112, 0.35);
  border-radius: 3px;
  color: var(--ink-mid);
  background: rgba(86, 166, 112, 0.06);
}

.status-tag.now {
  color: var(--red-ink);
  font-weight: 600;
  border-color: rgba(176, 58, 48, 0.3);
  background: rgba(176, 58, 48, 0.05);
}

.status-tag.now::before {
  content: '→ ';
}

/* --- Divider --- */
.divider {
  border: none;
  border-top: 1px solid var(--grid-heavy);
  margin: 3.5rem 0;
}

/* --- Section headers --- */
.section-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-light);
  margin-bottom: 0.25rem;
}

section h2 {
  font-family: var(--serif);
  font-size: 1.65rem;
  font-weight: 400;
  margin-bottom: 1.75rem;
  color: var(--ink);
}

/* --- Project Cards --- */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.project-card {
  background: rgba(245, 240, 232, 0.7);
  border: 1.5px solid var(--grid-heavy);
  border-radius: 4px;
  padding: 1.5rem 1.75rem;
  display: block;
  color: inherit;
  font-weight: 400;
  transition: background 0.2s, border-color 0.2s;
  position: relative;
}

.project-card:hover {
  background: rgba(255, 230, 100, 0.1);
  border-color: rgba(86, 166, 112, 0.55);
}

.project-card h3 {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 400;
  margin-bottom: 0.5rem;
}

.project-card p {
  font-size: 0.85rem;
  color: var(--ink-mid);
  margin-bottom: 1rem;
  line-height: 1.8;
}

.project-card .note {
  font-style: italic;
  color: var(--pencil);
  font-size: 0.8rem;
  font-weight: 400;
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tech-tag {
  font-size: 0.7rem;
  font-weight: 500;
  padding: 0.18rem 0.55rem;
  background: rgba(45, 90, 138, 0.1);
  color: var(--blue-ink);
  border-radius: 2px;
}

/* --- Background Grid --- */
.background-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.bg-card {
  padding: 1.25rem 1.5rem;
  border-left: 2.5px solid rgba(176, 58, 48, 0.25);
}

.bg-card h3 {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 400;
  margin-bottom: 0.25rem;
}

.bg-card .sub {
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--ink-light);
  margin-bottom: 0.4rem;
}

.bg-card p {
  font-size: 0.85rem;
  color: var(--ink-mid);
  line-height: 1.75;
}

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

.contact-links a {
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.5rem 1.1rem;
  border: 1.5px solid var(--grid-heavy);
  border-radius: 3px;
  color: var(--ink-mid);
  transition: all 0.2s;
}

.contact-links a:hover {
  color: var(--blue-ink);
  border-color: var(--blue-ink);
}

/* --- Footer --- */
footer {
  padding: 2.5rem 0;
  margin-top: 2rem;
  border-top: 1px solid var(--grid-heavy);
}

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

.footer-inner p {
  font-size: 0.74rem;
  color: var(--ink-light);
  font-weight: 500;
}

/* --- Responsive --- */
@media (max-width: 640px) {
  .hero { padding: 7rem 0 3rem; }
  .background-grid { grid-template-columns: 1fr; }
  .nav-links { gap: 1rem; }
  .contact-links { flex-direction: column; }
  .contact-links a { text-align: center; }
  .footer-inner { flex-direction: column; gap: 0.5rem; }
}