:root {
  --page-max: 1080px;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Refined dark palette */
  --color-bg: #0a0a0f;
  --color-bg-elevated: #12121a;
  --color-surface: rgba(18, 18, 26, 0.95);
  --color-surface-alt: rgba(24, 24, 35, 0.9);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(255, 255, 255, 0.15);

  /* Accent colors - emerald green */
  --color-accent: #10b981;
  --color-accent-strong: #059669;
  --color-accent-glow: rgba(16, 185, 129, 0.15);

  /* Text colors */
  --color-text: #fafafa;
  --color-text-secondary: #a1a1aa;
  --color-muted: #71717a;

  /* Effects */
  --shadow-soft: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 60px rgba(16, 185, 129, 0.1);
  --rounded-large: 20px;
  --rounded-card: 16px;
  --rounded-sm: 8px;
  --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --viewport-height: 100vh;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: calc(var(--viewport-height, 100vh));
  padding-top: 72px;
}

/* Subtle grid pattern overlay */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    radial-gradient(circle at 25% 25%, rgba(16, 185, 129, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 75% 75%, rgba(16, 185, 129, 0.02) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

/* Mobile adjustments */
body.is-mobile section {
  padding: 48px 16px;
}

body.is-mobile .hero {
  padding: 32px 16px 48px;
}

body.is-mobile .hero__inner {
  padding: 32px 24px;
  gap: 20px;
}

body.is-mobile .hero__meta {
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
}

body.is-mobile .hero__meta span[aria-hidden] {
  display: none;
}

body.is-mobile .hero__actions {
  width: 100%;
  flex-direction: column;
  align-items: stretch;
}

body.is-mobile .btn {
  width: 100%;
}

body.is-mobile .highlights__grid,
body.is-mobile .skills__columns {
  grid-template-columns: 1fr;
}

body.is-mobile .card {
  padding: 20px;
}

body.is-mobile .education__item,
body.is-mobile .timeline__entry {
  padding: 20px;
}

/* Tablet adjustments */
body.is-tablet section {
  padding: 64px 20px;
}

body.is-tablet .hero {
  padding: 48px 20px 64px;
}

body.is-tablet .hero__inner {
  padding: 48px 40px;
}

/* Desktop hero */
body.is-desktop .hero {
  min-height: calc(var(--viewport-height, 100vh) - 160px);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

a:hover,
a:focus {
  color: var(--color-accent);
  text-decoration: none;
}

/* Navigation */
.main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  padding: 0 20px;
}

.main-nav__inner {
  max-width: var(--page-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
}

.main-nav__logo {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.02em;
  transition: color var(--transition);
}

.main-nav__logo:hover {
  color: var(--color-accent);
}

.main-nav__links {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.main-nav__links a {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 0.9rem;
  padding: 8px 14px;
  border-radius: var(--rounded-sm);
  transition: color var(--transition), background var(--transition);
}

.main-nav__links a:hover,
.main-nav__links a:focus {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.05);
}

.main-nav__links a.active {
  color: var(--color-accent);
  background: var(--color-accent-glow);
}

/* Page Header */
.page-header {
  padding: 64px 20px 32px;
  text-align: center;
}

.page-header__inner {
  max-width: 640px;
  margin: 0 auto;
}

.page-header h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  margin: 0 0 12px;
  letter-spacing: -0.03em;
  color: var(--color-text);
}

.page-header p {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin: 0;
}

/* Contact Section */
.contact-section {
  padding: 32px 20px 80px;
}

.contact-container {
  max-width: var(--page-max);
  margin: 0 auto;
  display: grid;
  gap: 40px;
  grid-template-columns: 1fr 1.5fr;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-form-wrapper {
  background: var(--color-surface-alt);
  padding: 32px;
  border-radius: var(--rounded-card);
  border: 1px solid var(--color-border);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-weight: 500;
  color: var(--color-text);
  font-size: 0.875rem;
}

.form-group input,
.form-group textarea {
  padding: 12px 14px;
  border-radius: var(--rounded-sm);
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-muted);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* Sections */
section {
  padding: 72px 20px;
}

.section-heading {
  max-width: 640px;
  margin: 0 auto 40px;
  text-align: center;
}

.section-heading h2 {
  margin: 0 0 8px;
  font-size: clamp(1.75rem, 2.5vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-heading p {
  margin: 0;
  color: var(--color-text-secondary);
}

/* Hero Section */
.hero {
  padding: 48px 20px 72px;
  display: flex;
  justify-content: center;
}

.hero__inner {
  max-width: var(--page-max);
  width: 100%;
  background: var(--color-surface);
  padding: 56px;
  border-radius: var(--rounded-large);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: relative;
  overflow: hidden;
}

.hero__inner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0.5;
}

.hero__badge {
  align-self: flex-start;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: var(--color-accent-glow);
  color: var(--color-accent);
  font-weight: 500;
  font-size: 0.85rem;
  letter-spacing: 0.01em;
}

.hero__title {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hero__subtitle {
  margin: 0;
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

.hero__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 8px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: var(--rounded-sm);
  font-weight: 500;
  font-size: 0.9rem;
  border: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn--primary {
  background: var(--color-accent);
  color: #0a0a0f;
}

.btn--primary:hover,
.btn--primary:focus {
  background: var(--color-accent-strong);
  box-shadow: 0 8px 24px rgba(16, 185, 129, 0.3);
  color: #0a0a0f;
}

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

.btn--ghost:hover,
.btn--ghost:focus {
  border-color: var(--color-border-hover);
  background: rgba(255, 255, 255, 0.03);
  color: var(--color-text);
}

/* Highlights / Cards Grid */
.highlights {
  background: transparent;
}

.highlights__grid {
  max-width: var(--page-max);
  margin: 0 auto;
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* Cards */
.card {
  padding: 24px;
  border-radius: var(--rounded-card);
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.card p {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.card:hover,
.card:focus-within {
  transform: translateY(-2px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-glow);
}

/* Skills */
.skills__columns {
  max-width: 700px;
  margin: 0 auto;
  display: grid;
  gap: 48px;
  grid-template-columns: repeat(2, 1fr);
  text-align: left;
}

@media (max-width: 600px) {
  .skills__columns {
    grid-template-columns: 1fr;
    max-width: 320px;
    gap: 32px;
  }
}

.skills ul {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.skills li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 10px;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

.skills li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* Certifications */
.certifications__list {
  max-width: 640px;
  margin: 0 auto;
}

/* Education */
.education {
  background: var(--color-bg-elevated);
}

.education__item {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px;
  border-radius: var(--rounded-card);
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
}

.education__item h3 {
  margin-top: 0;
  margin-bottom: 4px;
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.education__meta {
  margin: 0;
  color: var(--color-accent);
  font-weight: 500;
  font-size: 0.95rem;
}

.education__item ul {
  margin: 16px 0 0;
  padding-left: 18px;
  color: var(--color-text-secondary);
}

.education__item li {
  margin-bottom: 6px;
}

/* Timeline */
.timeline {
  max-width: var(--page-max);
  margin: 0 auto;
  display: grid;
  gap: 20px;
}

.timeline__entry {
  padding: 24px 28px;
  border-radius: var(--rounded-card);
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  transition: border-color var(--transition);
}

.timeline__entry:hover {
  border-color: var(--color-border-hover);
}

.timeline__entry header h3 {
  margin: 0 0 4px;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.timeline__entry header p {
  margin: 0 0 14px;
  color: var(--color-accent);
  font-weight: 500;
  font-size: 0.9rem;
}

.timeline__entry ul {
  margin: 0;
  padding-left: 18px;
  color: var(--color-text-secondary);
}

.timeline__entry li {
  margin-bottom: 6px;
  line-height: 1.6;
}

/* CTA Section */
.cta {
  padding: 80px 20px 100px;
}

.cta__inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px;
  border-radius: var(--rounded-large);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  text-align: center;
  display: grid;
  gap: 20px;
  position: relative;
  overflow: hidden;
}

.cta__inner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0.5;
}

.cta__inner h2 {
  margin: 0;
  font-size: clamp(1.75rem, 2.5vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.cta__inner p {
  margin: 0;
  color: var(--color-text-secondary);
}

/* Footer */
.site-footer {
  padding: 32px 16px 48px;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.875rem;
  border-top: 1px solid var(--color-border);
}

/* Responsive adjustments */
@media (max-width: 720px) {
  .hero__inner {
    padding: 40px 28px;
  }

  .hero__actions {
    width: 100%;
  }

  .btn {
    flex: 1 1 auto;
  }

  .education__item,
  .timeline__entry {
    padding: 20px;
  }

  .cta__inner {
    padding: 40px 28px;
  }

  .main-nav__links {
    gap: 4px;
    font-size: 0.85rem;
  }

  .main-nav__links a {
    padding: 6px 10px;
  }

  .main-nav__logo {
    font-size: 1rem;
  }

  .contact-container {
    grid-template-columns: 1fr;
  }

  .contact-form-wrapper {
    padding: 24px;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-hover);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-muted);
}