/* --- Design Tokens & Variables --- */
:root {
  /* Fonts */
  --font-logo: 'Arvo', Georgia, serif;
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Colors - Light Theme (Default) */
  --bg-primary: #fafbfa;
  --bg-secondary: #f4f4f5;
  --text-primary: #18181b;
  --text-secondary: #52525b;
  --text-muted: #a1a1aa;
  
  /* Ice Lavender Gradient Card */
  --card-gradient: linear-gradient(135deg, #e0e7ff 0%, #bae6fd 100%);
  --card-text: #0f172a;
  --card-text-secondary: #334155;
  
  /* Translucent Glassmorphic Capsule */
  --capsule-bg: rgba(255, 255, 255, 0.45);
  --capsule-border: rgba(255, 255, 255, 0.35);
  --capsule-shadow: rgba(0, 0, 0, 0.03);
  --capsule-backdrop-blur: blur(12px);

  /* Element Styling */
  --header-bg: rgba(250, 251, 250, 0.85);
  --project-card-bg: #ffffff;
  --project-card-border: #e4e4e7;
  --project-card-hover-border: #18181b;
  
  /* Shadow Systems */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 10px 10px -5px rgba(0, 0, 0, 0.03);

  /* Animations */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme Variables */
.dark-theme {
  --bg-primary: #09090b;
  --bg-secondary: #18181b;
  --text-primary: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-muted: #52525b;
  
  /* Ice Lavender Gradient Card (Dark Theme Variant) */
  --card-gradient: linear-gradient(135deg, #1e1b4b 0%, #0f172a 100%);
  --card-text: #ffffff;
  --card-text-secondary: #cbd5e1;

  /* Translucent Glassmorphic Capsule */
  --capsule-bg: rgba(255, 255, 255, 0.12);
  --capsule-border: rgba(255, 255, 255, 0.12);
  --capsule-shadow: rgba(0, 0, 0, 0.2);

  /* Element Styling */
  --header-bg: rgba(9, 9, 11, 0.85);
  --project-card-bg: #121214;
  --project-card-border: #27272a;
  --project-card-hover-border: #f4f4f5;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Accessibility: Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background-color: var(--text-primary);
  color: var(--bg-primary);
  padding: 12px 24px;
  z-index: 1000;
  font-weight: 600;
  text-decoration: none;
  border-bottom-right-radius: 8px;
  transition: top var(--transition-fast) ease;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--text-primary);
  outline-offset: -3px;
}

/* Focus States */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--text-primary);
  outline-offset: 2px;
}

/* --- Typography Helpers --- */
h1, h2, h3, h4 {
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

/* --- Main Layout Container --- */
.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Header Section --- */
.main-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background-color: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--project-card-border);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1120px;
  margin: 0 auto;
  padding: 16px 24px;
}

/* Stacked Logo Style */
.logo {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--text-primary);
  font-family: var(--font-logo);
  font-weight: 700;
  line-height: 0.85;
  font-size: 24px;
  letter-spacing: -0.04em;
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.02);
}

.logo-matt {
  letter-spacing: -0.02em;
}

.logo-obee {
  letter-spacing: -0.04em;
}

.nav-wrapper {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 24px;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 700;
  font-size: 16px;
  position: relative;
  padding: 4px 0;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
}

/* Underline slide effect on hover */
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-link.active {
  color: var(--text-primary);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 8px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-normal);
}

.theme-toggle-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  transform: rotate(15deg);
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
}

/* Toggle Visibility based on Theme */
.sun-icon {
  display: block;
}
.moon-icon {
  display: none;
}

.dark-theme .sun-icon {
  display: none;
}
.dark-theme .moon-icon {
  display: block;
}

/* --- Hero Section & Overlapping Design --- */
.hero-section {
  padding: 140px 0 60px;
  position: relative;
  overflow: visible;
}

.hero-container {
  position: relative;
  max-width: 1072px;
  margin: 0 auto;
  padding: 0 24px;
}

/* The Lime Green/Yellow Gradient Hero Card */
.hero-card {
  background: var(--card-gradient);
  border-radius: 28px;
  padding: 72px 64px;
  color: var(--card-text);
  box-shadow: var(--shadow-xl);
  position: relative;
  z-index: 2;
  max-width: 100%;
  transform: translateZ(0);
  transition: transform var(--transition-slow);
}

/* Subtle Hover Effect on Card */
.hero-card:hover {
  transform: translateY(-2px);
}

.hero-headline {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  max-width: 80%;
  color: var(--card-text);
}

.hero-body {
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.6;
  margin-bottom: 32px;
  max-width: 65%;
  color: var(--card-text-secondary);
  font-weight: 500;
}

.hero-highlight {
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 700;
  color: var(--card-text);
}

/* Floating Glassmorphic Capsules */
.capsule {
  position: absolute;
  width: 88px;
  height: 260px;
  border-radius: 9999px;
  background-color: var(--capsule-bg);
  border: 1px solid var(--capsule-border);
  box-shadow: 0 10px 40px var(--capsule-shadow);
  backdrop-filter: var(--capsule-backdrop-blur);
  -webkit-backdrop-filter: var(--capsule-backdrop-blur);
  z-index: 3;
  pointer-events: none;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.capsule-top {
  top: -48px;
  right: 17%;
  animation: floatTop 7s ease-in-out infinite alternate;
}

.capsule-bottom {
  bottom: -64px;
  right: 10%;
  animation: floatBottom 8s ease-in-out infinite alternate;
  animation-delay: 1.5s;
}

/* Floating Micro-Animations */
@keyframes floatTop {
  0% {
    transform: translateY(0) rotate(0deg);
  }
  100% {
    transform: translateY(-16px) rotate(1deg);
  }
}

@keyframes floatBottom {
  0% {
    transform: translateY(0) rotate(0deg);
  }
  100% {
    transform: translateY(18px) rotate(-1deg);
  }
}

/* --- Two Column Layout Section --- */
.experience-writing-section {
  padding: 60px 0 120px;
}

.grid-layout {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 80px;
  align-items: start;
}

/* --- Left Column: Articles / Writing --- */
.articles-list {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.article-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

/* Date Indicator with Vertical Line matching the screenshot */
.article-date {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  display: flex;
  align-items: center;
}

.article-date::before {
  content: "";
  display: inline-block;
  width: 1px;
  height: 16px;
  background-color: var(--project-card-border);
  margin-right: 12px;
  transition: background-color var(--transition-normal);
}

.article-title {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.4;
}

.article-title a {
  text-decoration: none;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

.article-title a:hover {
  color: var(--text-secondary);
}

.article-link {
  font-size: 14px;
  font-weight: 600;
  color: #3b82f6; /* Modern Blue link color */
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color var(--transition-fast), gap var(--transition-fast);
}

.article-link:hover {
  color: #1d4ed8;
  gap: 8px;
}

.arrow {
  font-size: 16px;
  line-height: 1;
}

/* --- Right Column: Work Experience Card --- */
.work-card {
  background-color: var(--project-card-bg);
  border: 1px solid var(--project-card-border);
  border-radius: 20px;
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.work-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.briefcase-icon {
  width: 20px;
  height: 20px;
  color: var(--text-secondary);
}

.work-card-header h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.experience-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 24px;
}

.experience-row {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Circular Logo design matching screenshot */
.company-logo {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.experience-row:hover .company-logo {
  transform: scale(1.05);
}

.company-logo img,
.company-logo svg {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.experience-details {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.company-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}

.role-title {
  font-size: 13px;
  color: var(--text-secondary);
}

.experience-duration {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
  white-space: nowrap;
}

/* Download Button inside card */
.download-resume-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px;
  background-color: var(--bg-secondary);
  border-radius: 8px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.download-resume-btn:hover {
  background-color: var(--project-card-border);
}

.download-icon {
  width: 14px;
  height: 14px;
  color: var(--text-secondary);
  transition: transform var(--transition-fast);
}

.download-resume-btn:hover .download-icon {
  transform: translateY(2px);
}

/* --- Footer Section --- */
.main-footer {
  padding: 40px 0;
  text-align: center;
  transition: color var(--transition-normal);
}

.minimal-footer-text {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.03em;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.heart {
  color: #ef4444; /* Soft red heartbeat icon */
  font-size: 13px;
  display: inline-block;
  animation: heartBeat 1.4s ease-in-out infinite;
}

@keyframes heartBeat {
  0%, 100% { transform: scale(1); }
  35% { transform: scale(1.2); }
  45% { transform: scale(1.05); }
  60% { transform: scale(1.25); }
}

/* --- Responsive Layout Adjustments --- */

/* Tablets & Small Desktops */
@media (max-width: 1024px) {
  .hero-headline {
    max-width: 75%;
  }
  .hero-body {
    max-width: 75%;
  }
  .capsule-top {
    right: 10%;
  }
  .capsule-bottom {
    right: 5%;
  }
  .grid-layout {
    grid-template-columns: 1fr;
    gap: 56px;
  }
  .experience-column {
    max-width: 480px;
    width: 100%;
  }
}

/* Mobile Devices */
@media (max-width: 768px) {
  .header-container {
    padding: 12px 20px;
  }
  
  .nav-wrapper {
    gap: 16px;
  }

  .nav-list {
    gap: 16px;
  }

  .nav-link {
    font-size: 14px;
  }

  .logo {
    font-size: 20px;
  }

  .hero-section {
    padding: 110px 0 40px;
  }

  .hero-card {
    padding: 48px 32px;
    border-radius: 20px;
  }

  .hero-headline {
    max-width: 100%;
    margin-bottom: 16px;
  }

  .hero-body {
    max-width: 100%;
    margin-bottom: 24px;
  }

  /* Adjust capsules to stay visual but not clip */
  .capsule {
    width: 64px;
    height: 180px;
  }

  .capsule-top {
    top: -24px;
    right: 8%;
  }

  .capsule-bottom {
    bottom: -32px;
    right: 3%;
  }

  .experience-writing-section {
    padding: 40px 0 80px;
  }

  .grid-layout {
    gap: 48px;
  }

  .articles-list {
    gap: 32px;
  }

  .article-title {
    font-size: 18px;
  }

  .work-card {
    padding: 24px;
  }
}

/* Small Mobiles */
@media (max-width: 480px) {
  .hero-card {
    padding: 40px 24px;
  }
  
  .capsule {
    display: none;
  }
  
  .nav-list {
    gap: 12px;
  }
}