:root {
  /* COLOR PALETTE */
  --color-paper-base: #f7f5f0;
  --color-paper-alt: #f0ede5;
  --color-ink-base: #262422;
  --color-ink-light: #524f4a;
  --color-ink-lighter: #858079;
  --color-accent-tan: #c28d5a;
  --color-hairline: #e0dcd1;

  /* TYPOGRAPHY */
  --font-head: 'Playfair Display', serif;
  --font-body: 'Instrument Sans', sans-serif;
  
  /* SPACING SYSTEM */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;
}

/* RESET & BASE */
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background-color: var(--color-paper-base);
  color: var(--color-ink-base);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* LAYOUT */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: var(--space-xl);
  align-items: start;
}

@media (max-width: 1024px) {
  .container {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    padding: var(--space-lg);
  }
}

/* SIDEBAR NAVIGATION */
nav { position: sticky; top: var(--space-lg); }
.nav-header {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-ink-base);
}
.nav-header h1 { font-size: 1.5rem; line-height: 1.1; margin-bottom: var(--space-xs); font-weight: 400; }
.nav-links { list-style: none; }
.nav-links li { border-bottom: 1px solid var(--color-hairline); }
.nav-links a {
  display: block;
  text-decoration: none;
  color: var(--color-ink-light);
  padding: var(--space-sm) 0;
  font-family: var(--font-body);
  font-size: 0.875rem;
  transition: color 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.nav-links a:hover, .nav-links a.active { color: var(--color-ink-base); font-weight: 500;}

/* TYPOGRAPHY */
.metadata {
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-ink-light);
  font-family: var(--font-body);
  display: block;
}
h1, h2, h3, h4, h5, h6 { font-family: var(--font-head); font-weight: 400; line-height: 1.1; color: var(--color-ink-base); margin-bottom: var(--space-sm); }
.display-title { font-size: 5rem; letter-spacing: -0.02em; margin-bottom: var(--space-lg); line-height: 1.05; }
@media (max-width: 768px) {
    .display-title { font-size: 3.5rem; }
}
.editorial-italic { font-style: italic; font-weight: 400; color: var(--color-ink-base); }
h2 { font-size: 2.5rem; border-bottom: 1px solid var(--color-hairline); padding-bottom: var(--space-sm); margin-bottom: var(--space-md); }
h3 { font-size: 1.5rem; margin-top: var(--space-md); }
p { margin-bottom: var(--space-md); font-size: 1.125rem; max-width: 65ch; color: var(--color-ink-light); }
.lead { font-size: 1.5rem; color: var(--color-ink-base); max-width: 50ch; line-height: 1.4; }
.accent-italic { font-family: var(--font-head); font-style: italic; color: var(--color-accent-tan); }
a { color: var(--color-ink-base); transition: color 0.3s ease; }
a:hover { color: var(--color-accent-tan); }

/* SECTIONS */
section { margin-bottom: var(--space-xl); scroll-margin-top: var(--space-xl); }

/* UI ELEMENTS */
.ui-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); }
@media (max-width: 768px) { .ui-grid { grid-template-columns: 1fr; } }

/* BUTTONS */
.btn {
  display: inline-block; background: transparent; color: var(--color-ink-base);
  border: 1px solid var(--color-ink-base); padding: 1rem 2rem; border-radius: 0;
  font-family: var(--font-body); font-size: 0.75rem; text-transform: uppercase;
  letter-spacing: 0.15em; cursor: pointer; transition: all 0.3s ease; text-decoration: none;
}
.btn:hover { background: var(--color-ink-base); color: var(--color-paper-base); }
.btn-outline { border: 1px solid var(--color-hairline); color: var(--color-ink-light); }
.btn-outline:hover { border-color: var(--color-ink-base); color: var(--color-ink-base); background: transparent; }

/* PANELS */
.panel {
  border: 1px solid var(--color-hairline); background: var(--color-paper-base);
  padding: var(--space-lg); border-top: 2px solid var(--color-accent-tan);
  height: 100%;
}
.panel-header { margin-bottom: var(--space-sm); }

/* TABLES / LISTS */
table { width: 100%; border-collapse: collapse; text-align: left; margin-top: var(--space-md); }
th {
  font-family: var(--font-body); font-weight: 500; text-transform: uppercase;
  letter-spacing: 0.1em; font-size: 0.75rem; color: var(--color-ink-light);
  border-bottom: 1px solid var(--color-ink-base); padding: var(--space-sm) 0;
}
td { padding: var(--space-md) 0; border-bottom: 1px solid var(--color-hairline); color: var(--color-ink-light); font-family: var(--font-body); vertical-align: top; }
tr:last-child td { border-bottom: none; }
td.col-head { font-family: var(--font-head); color: var(--color-ink-base); font-size: 1.125rem; width: 40%; }
@media (max-width: 768px) {
    table, thead, tbody, th, td, tr { display: block; }
    th { display: none; }
    td { padding: var(--space-sm) 0; border-bottom: none; }
    td.col-head { width: 100%; border-top: 1px solid var(--color-hairline); padding-top: var(--space-md); margin-top: var(--space-sm); font-size: 1.25rem; }
    tr:first-child td.col-head { border-top: none; }
    td:last-child { border-bottom: 1px solid var(--color-hairline); padding-bottom: var(--space-md); }
    tr:last-child td:last-child { border-bottom: none; }
}

/* UTILITIES */
.thin-rule { height: 1px; background-color: var(--color-hairline); border: none; margin: var(--space-xl) 0; }
.mt-md { margin-top: var(--space-md); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-0 { margin-bottom: 0; }
.flex { display: flex; gap: var(--space-sm); align-items: center; }
.tech-list { display: flex; flex-wrap: wrap; gap: 0.5rem; list-style: none; margin-bottom: var(--space-sm); margin-top: var(--space-sm); }
.tech-tag { border: 1px solid var(--color-hairline); padding: 0.25rem 0.5rem; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--color-ink-light); }