/* ===========================
   DAVID CARRIGG PORTFOLIO
   Viking-Norse Aesthetic
   Weathered Wood & Forged Iron
   =========================== */

@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@400;600;700;900&family=EB+Garamond:wght@400;500;600;700&display=swap');

/* ===== CSS VARIABLES ===== */
:root {
  /* Viking-Norse Color Palette */
  --wood-dark: #1a1410;
  --wood-light: #b8a080;
  --iron-black: #0a0a0a;
  --iron-gray: #3d3d3d;
  --iron-light: #a8a8a8;
  --gold: #d4af37;
  --amber: #b8860b;
  --blood-red: #8b0000;
  --fire-orange: #d85d3a;
  --fjord-blue: #1c3a47;
  --moss-green: #4a5d3d;
  --earth-brown: #6b5344;

  /* Neutral tones */
  --cream: #f5f1e8;
  --parchment: #ede4d3;

  /* Spacing - 4px base unit */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;

  /* Font Sizes */
  --font-xs: 0.75rem;
  --font-sm: 0.875rem;
  --font-base: 1rem;
  --font-lg: 1.25rem;
  --font-xl: 1.5rem;
  --font-2xl: 2rem;
  --font-3xl: 2.5rem;
  --font-4xl: 3.5rem;

  /* Border & Shadow */
  --border-width: 3px;
  --shadow-carved: inset 0 1px 3px rgba(0,0,0,0.4), inset 0 -1px 3px rgba(255,255,255,0.1);
  --shadow-deep: 0 4px 8px rgba(0,0,0,0.3), 0 8px 16px rgba(0,0,0,0.2);
}

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

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

body {
  background-color: var(--parchment);
  background-image:
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 2px,
      rgba(0,0,0,0.03) 2px,
      rgba(0,0,0,0.03) 4px
    ),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(0,0,0,0.02) 2px,
      rgba(0,0,0,0.02) 4px
    );
  color: var(--wood-dark);
  font-family: 'EB Garamond', serif;
  line-height: 1.8;
  font-weight: 400;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Cinzel', serif;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--spacing-lg);
  line-height: 1.2;
  color: var(--iron-black);
}

h1 {
  font-size: var(--font-4xl);
  font-weight: 900;
  letter-spacing: 0.12em;
  color: var(--blood-red);
  text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

h2 {
  font-size: var(--font-3xl);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--iron-black);
  border-bottom: 3px double var(--gold);
  padding-bottom: var(--spacing-md);
}

h3 {
  font-size: var(--font-2xl);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--iron-black);
}

h4 {
  font-size: var(--font-xl);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--earth-brown);
}

p {
  font-size: var(--font-base);
  margin-bottom: var(--spacing-lg);
  color: var(--wood-dark);
  line-height: 1.8;
}

a {
  color: var(--blood-red);
  text-decoration: none;
  border-bottom: 2px solid var(--gold);
  transition: all 0.2s ease;
  font-weight: 500;
}

a:hover {
  color: var(--fire-orange);
  background-color: rgba(212, 175, 55, 0.1);
  padding: 2px 4px;
}

/* ===== HEADER & NAVIGATION ===== */
header {
  background-color: var(--iron-black);
  background-image:
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 1px,
      rgba(212, 175, 55, 0.1) 1px,
      rgba(212, 175, 55, 0.1) 2px
    );
  border-bottom: 4px solid var(--gold);
  padding: var(--spacing-lg) var(--spacing-xl);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-deep);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: 'Cinzel', serif;
  font-size: var(--font-2xl);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--gold);
  text-decoration: none;
  border: 2px solid var(--gold);
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: rgba(0,0,0,0.3);
  transition: all 0.2s ease;
}

.logo:hover {
  background-color: var(--gold);
  color: var(--iron-black);
  border-color: var(--iron-black);
}

nav ul {
  list-style: none;
  display: flex;
  gap: var(--spacing-xl);
  align-items: center;
  margin: 0;
}

nav a {
  font-family: 'Cinzel', serif;
  font-size: var(--font-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gold);
  border: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 4px;
  transition: all 0.2s ease;
}

nav a:hover {
  color: var(--fire-orange);
  border-bottom: 2px solid var(--fire-orange);
  background-color: transparent;
  padding: 0;
}

nav a.active {
  color: var(--fire-orange);
  border-bottom: 2px solid var(--fire-orange);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: var(--gold);
  border: 2px solid var(--gold);
  color: var(--iron-black);
  cursor: pointer;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  font-weight: 700;
}

.menu-toggle span {
  width: 20px;
  height: 2px;
  background-color: var(--iron-black);
  transition: all 0.2s ease;
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(8px, -8px);
}

/* ===== MAIN CONTENT ===== */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-3xl) var(--spacing-xl);
}

section {
  margin-bottom: var(--spacing-4xl);
  background-color: var(--cream);
  border: var(--border-width) solid var(--iron-black);
  padding: var(--spacing-2xl) var(--spacing-xl);
  position: relative;
  box-shadow:
    0 6px 12px rgba(0,0,0,0.2),
    inset 0 1px 0 rgba(255,255,255,0.5);
}

/* Pseudo-nail corners on sections */
section::before,
section::after {
  content: '';
  position: absolute;
  width: 12px;
  height: 12px;
  background-color: var(--gold);
  border: 2px solid var(--iron-black);
  border-radius: 2px;
  z-index: 2;
}

section::before {
  top: 12px;
  left: 12px;
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.3);
}

section::after {
  top: 12px;
  right: 12px;
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.3);
}

section:nth-child(odd) {
  background-color: var(--parchment);
}

section:nth-child(even) {
  background-color: rgba(184, 160, 128, 0.15);
}

/* ===== HERO SECTION ===== */
.hero {
  text-align: center;
  margin-bottom: var(--spacing-4xl);
  background: linear-gradient(135deg, rgba(26, 20, 16, 0.05) 0%, transparent 100%);
}

.hero h1 {
  margin-bottom: var(--spacing-md);
}

.hero .subtitle {
  font-size: var(--font-xl);
  font-family: 'Cinzel', serif;
  color: var(--blood-red);
  margin-bottom: var(--spacing-xl);
  letter-spacing: 0.08em;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-lg);
  border: 2px solid var(--iron-black);
  background-color: var(--iron-black);
  color: var(--gold);
  font-family: 'Cinzel', serif;
  font-weight: 700;
  font-size: var(--font-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  box-shadow: var(--shadow-deep);
}

.btn:hover {
  background-color: var(--blood-red);
  border-color: var(--fire-orange);
  color: var(--cream);
  transform: translateY(-2px);
  box-shadow: var(--shadow-deep), 0 0 8px rgba(139, 0, 0, 0.3);
}

.btn-secondary {
  background-color: var(--gold);
  color: var(--iron-black);
}

.btn-secondary:hover {
  background-color: var(--fire-orange);
  border-color: var(--blood-red);
  color: var(--cream);
}

/* ===== TIMELINE ===== */
.timeline {
  position: relative;
  padding: var(--spacing-xl) 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 100%;
  background-color: var(--gold);
  top: 0;
}

.timeline-item {
  margin-bottom: var(--spacing-2xl);
  width: 48%;
  position: relative;
}

.timeline-item:nth-child(odd) {
  margin-left: 0;
  text-align: right;
  padding-right: var(--spacing-xl);
}

.timeline-item:nth-child(even) {
  margin-left: 52%;
  text-align: left;
  padding-left: var(--spacing-xl);
}

.timeline-item::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  background-color: var(--fire-orange);
  border: 3px solid var(--gold);
  border-radius: 50%;
  top: 8px;
  z-index: 2;
}

.timeline-item:nth-child(odd)::before {
  right: calc(-8px - 25px);
}

.timeline-item:nth-child(even)::before {
  left: calc(-8px - 25px);
}

.timeline-year {
  font-family: 'Cinzel', serif;
  font-size: var(--font-lg);
  font-weight: 700;
  color: var(--blood-red);
  margin-bottom: var(--spacing-sm);
  letter-spacing: 0.08em;
}

.timeline-item.teaching .timeline-year {
  color: var(--fjord-blue);
}

.timeline-item.award .timeline-year {
  color: var(--gold);
}

.timeline-title {
  font-family: 'Cinzel', serif;
  font-size: var(--font-lg);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--iron-black);
}

.timeline-description {
  font-size: var(--font-base);
  margin-bottom: var(--spacing-sm);
  color: var(--wood-dark);
}

.timeline-role {
  font-size: var(--font-sm);
  font-style: italic;
  color: var(--iron-gray);
}

/* ===== SKILL CARDS ===== */
.skill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.skill-card {
  border: 2px solid var(--iron-black);
  padding: var(--spacing-lg);
  background-color: var(--cream);
  box-shadow: var(--shadow-deep);
  position: relative;
  transition: all 0.2s ease;
}

.skill-card:hover {
  transform: translateY(-4px);
  border-color: var(--blood-red);
  box-shadow: var(--shadow-deep), 0 0 12px rgba(139, 0, 0, 0.2);
}

.skill-card::before,
.skill-card::after {
  content: '';
  position: absolute;
  width: 8px;
  height: 8px;
  background-color: var(--gold);
  border: 1px solid var(--iron-black);
  border-radius: 1px;
}

.skill-card::before {
  top: 8px;
  left: 8px;
}

.skill-card::after {
  top: 8px;
  right: 8px;
}

.skill-card h3 {
  margin-bottom: var(--spacing-md);
}

.skill-card ul {
  list-style: none;
  padding: 0;
}

.skill-card li {
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-lg);
  position: relative;
  font-size: var(--font-sm);
}

.skill-card li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--blood-red);
  font-weight: 700;
}

/* ===== PROJECT CARDS ===== */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.project-card {
  border: 2px solid var(--iron-black);
  overflow: hidden;
  background-color: var(--cream);
  box-shadow: var(--shadow-deep);
  transition: all 0.2s ease;
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--fire-orange);
  box-shadow: var(--shadow-deep), 0 0 12px rgba(216, 93, 58, 0.2);
}

.project-image {
  width: 100%;
  height: 140px;
  background: linear-gradient(135deg, var(--iron-gray) 0%, var(--wood-dark) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 2px solid var(--gold);
}

.project-content {
  padding: var(--spacing-lg);
}

.project-role {
  font-family: 'Cinzel', serif;
  font-size: var(--font-xs);
  font-weight: 700;
  text-transform: uppercase;
  color: var(--blood-red);
  margin-bottom: var(--spacing-sm);
  letter-spacing: 0.06em;
}

.project-card h3 {
  margin-bottom: var(--spacing-md);
  font-size: var(--font-lg);
}

.project-description {
  font-size: var(--font-sm);
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
}

.project-links {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.project-links a {
  padding: 4px 8px;
  border: 1px solid var(--iron-black);
  font-size: var(--font-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  font-family: 'Cinzel', serif;
  color: var(--blood-red);
  transition: all 0.2s ease;
}

.project-links a:hover {
  background-color: var(--blood-red);
  color: var(--cream);
  border-color: var(--blood-red);
}

/* ===== EXPERIMENT GRID ===== */
.experiment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.experiment-card {
  border: 2px solid var(--iron-black);
  padding: var(--spacing-lg);
  text-align: center;
  text-decoration: none;
  color: var(--wood-dark);
  background-color: var(--cream);
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 160px;
  box-shadow: var(--shadow-deep);
}

.experiment-card:hover {
  background-color: var(--blood-red);
  color: var(--cream);
  border-color: var(--fire-orange);
  transform: translateY(-4px);
}

.experiment-card:hover h3,
.experiment-card:hover p {
  color: var(--cream);
}

.experiment-emoji {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.experiment-card h3 {
  font-size: var(--font-lg);
  margin-bottom: var(--spacing-sm);
  margin-top: 0;
}

.experiment-card p {
  font-size: var(--font-sm);
  margin-bottom: 0;
}

/* ===== SECTION STYLING ===== */
.section-title {
  font-size: var(--font-3xl);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-lg);
  text-align: center;
  color: var(--blood-red);
  border-bottom: 3px double var(--gold);
  padding-bottom: var(--spacing-md);
}

.section-subtitle {
  font-size: var(--font-lg);
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--earth-brown);
  letter-spacing: 0.04em;
  line-height: 1.6;
}

/* ===== FOOTER ===== */
footer {
  background-color: var(--iron-black);
  background-image:
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 1px,
      rgba(212, 175, 55, 0.1) 1px,
      rgba(212, 175, 55, 0.1) 2px
    );
  color: var(--gold);
  padding: var(--spacing-2xl) var(--spacing-xl);
  text-align: center;
  border-top: 4px solid var(--gold);
  margin-top: var(--spacing-3xl);
  box-shadow: var(--shadow-deep);
}

.footer-content {
  max-width: 900px;
  margin: 0 auto;
}

.social-links {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 2px solid var(--gold);
  color: var(--gold);
  font-weight: 700;
  text-transform: uppercase;
  font-size: var(--font-xs);
  transition: all 0.2s ease;
  background-color: rgba(212, 175, 55, 0.1);
}

.social-links a:hover {
  background-color: var(--gold);
  color: var(--iron-black);
  border-color: var(--iron-black);
}

.footer-text {
  color: var(--gold);
  font-size: var(--font-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1024px) {
  main {
    padding: var(--spacing-2xl) var(--spacing-lg);
  }

  section {
    padding: var(--spacing-xl) var(--spacing-lg);
  }

  nav ul {
    gap: var(--spacing-lg);
  }

  .timeline::before {
    display: none;
  }

  .timeline-item {
    width: 100%;
    margin-left: 0 !important;
    padding-left: var(--spacing-xl);
    text-align: left;
    padding-right: 0;
  }

  .timeline-item::before {
    left: 0;
  }
}

@media (max-width: 768px) {
  .header-content {
    flex-wrap: wrap;
  }

  .menu-toggle {
    display: flex;
  }

  nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--iron-black);
    border-bottom: 3px solid var(--gold);
    flex-direction: column;
    padding: var(--spacing-lg);
    z-index: 99;
    box-shadow: var(--shadow-deep);
  }

  nav.active {
    display: flex;
  }

  nav ul {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  main {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  section {
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-lg) var(--spacing-md);
  }

  h1 {
    font-size: var(--font-2xl);
  }

  h2 {
    font-size: var(--font-xl);
  }

  .section-title {
    font-size: var(--font-2xl);
  }

  .hero-cta {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    text-align: center;
  }

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

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

  .experiment-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }
}

@media (max-width: 480px) {
  :root {
    font-size: 14px;
  }

  header {
    padding: var(--spacing-md) var(--spacing-lg);
  }

  main {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  section {
    padding: var(--spacing-md);
  }

  h1 {
    font-size: var(--font-xl);
  }

  .skill-grid {
    gap: var(--spacing-lg);
  }

  .experiment-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .social-links a {
    width: 36px;
    height: 36px;
    font-size: var(--font-xs);
  }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}