/* ===================================
   CSS Variables & Reset
   =================================== */
:root {
  /* Colors - Dark theme with teal accent */
  --color-bg: #0f172a;
  --color-bg-elevated: #1e293b;
  --color-bg-card: #1e293b;
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-text-subtle: #64748b;
  --color-accent: #2dd4bf;
  --color-accent-dim: rgba(45, 212, 191, 0.15);
  --color-border: #334155;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;

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

  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle noise texture overlay */
.noise {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.03;
  z-index: 1000;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* ===================================
   Layout
   =================================== */
.container {
  width: 100%;
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-4xl) 0;
}

/* ===================================
   Header
   =================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.025em;
  color: var(--color-accent);
}

.nav {
  display: flex;
  gap: var(--space-xl);
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -0.25rem;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

.nav-link:hover::after {
  width: 100%;
}

/* Mobile nav toggle - hidden by default */
@media (max-width: 640px) {
  .nav {
    display: none;
  }
}

/* ===================================
   Hero Section
   =================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 4rem;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

@media (min-width: 1024px) {
  .hero .container {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

.hero-greeting {
  font-size: 1.125rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: var(--space-sm);
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-lg);
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--color-accent) 0%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.25rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.hero-description {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 36rem;
  line-height: 1.7;
  margin-bottom: var(--space-xl);
}

.hero-cta {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* Hero Card */
.hero-visual {
  display: flex;
  justify-content: center;
}

.hero-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  position: relative;
  overflow: hidden;
  width: 100%;
  max-width: 20rem;
}

.card-accent {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent), #06b6d4);
}

.card-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.card-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  font-weight: 600;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
}

.card-company {
  color: var(--color-text-muted);
}

/* ===================================
   Buttons
   =================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
}

.btn-primary:hover {
  background: #5eead4;
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-text-muted);
  background: var(--color-bg-elevated);
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.0625rem;
}

/* ===================================
   Section Headers
   =================================== */
.section-header {
  margin-bottom: var(--space-3xl);
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.025em;
}

/* ===================================
   About Section
   =================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3xl);
}

@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
  }
}

.about-text p {
  margin-bottom: var(--space-lg);
  color: var(--color-text-muted);
  font-size: 1.0625rem;
}

.about-lead {
  font-size: 1.375rem !important;
  color: var(--color-text) !important;
  line-height: 1.5;
}

.italic-accent {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--color-accent);
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.stat-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
}

.stat-label {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

/* ===================================
   Experience Section (Timeline)
   =================================== */
.experience {
  background: var(--color-bg-elevated);
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-3xl);
}

.timeline-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .timeline-item {
    grid-template-columns: 10rem 1fr;
    gap: var(--space-2xl);
  }
}

.timeline-date {
  position: relative;
}

.date-range {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  white-space: nowrap;
}

@media (min-width: 768px) {
  .timeline-date::after {
    content: '';
    position: absolute;
    top: 0.5rem;
    right: -1.25rem;
    width: 8px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 50%;
  }
}

.timeline-content {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: border-color var(--transition-base);
}

.timeline-content:hover {
  border-color: var(--color-accent);
}

.timeline-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.timeline-company {
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: var(--space-md);
}

.timeline-description {
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.timeline-highlights {
  margin-bottom: var(--space-lg);
}

.timeline-highlights li {
  position: relative;
  padding-left: var(--space-lg);
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  margin-bottom: var(--space-sm);
}

.timeline-highlights li::before {
  content: '\2192';
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-accent);
  background: var(--color-accent-dim);
  border-radius: 9999px;
}

/* ===================================
   Ventures Section
   =================================== */
.ventures-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 768px) {
  .ventures-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.venture-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  position: relative;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.venture-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
}

.venture-featured {
  background: linear-gradient(135deg, rgba(45, 212, 191, 0.1) 0%, rgba(6, 182, 212, 0.05) 100%);
}

.venture-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-bg);
  background: var(--color-accent);
  border-radius: 9999px;
  margin-bottom: var(--space-md);
}

.venture-badge-past {
  background: var(--color-text-subtle);
}

.venture-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.venture-tagline {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.venture-description {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  margin-bottom: var(--space-xl);
}

.venture-metrics {
  display: flex;
  gap: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.metric {
  display: flex;
  flex-direction: column;
}

.metric-value {
  font-weight: 600;
  font-size: 0.9375rem;
}

.metric-label {
  font-size: 0.75rem;
  color: var(--color-text-subtle);
}

/* ===================================
   Education Section
   =================================== */
.education-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
}

@media (min-width: 768px) {
  .education-card {
    flex-direction: row;
    align-items: flex-start;
  }
}

.education-logo {
  width: 5rem;
  height: 5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-dim);
  border-radius: var(--radius-lg);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent);
  flex-shrink: 0;
}

.education-degree {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.education-school {
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.education-year {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-bottom: var(--space-lg);
}

.education-extras {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.extra-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

.extra-icon {
  color: var(--color-accent);
}

/* ===================================
   Contact Section
   =================================== */
.contact {
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-elevated) 100%);
  text-align: center;
}

.contact-content {
  max-width: 36rem;
  margin: 0 auto;
}

.contact-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: var(--space-lg);
}

.contact-description {
  color: var(--color-text-muted);
  font-size: 1.125rem;
  margin-bottom: var(--space-xl);
}

/* ===================================
   Footer
   =================================== */
.footer {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  text-align: center;
}

@media (min-width: 640px) {
  .footer-content {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-text {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
}

.footer-link {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

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

/* ===================================
   Utilities & Animations
   =================================== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    transition-duration: 0ms !important;
  }
}

/* Selection */
::selection {
  background: var(--color-accent);
  color: var(--color-bg);
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}