/* =============================================
   CSS Custom Properties
   ============================================= */
:root {
  --color-bg:          #0a0a0a;
  --color-surface:     #111111;
  --color-surface-2:   #1a1a1a;
  --color-border:      #222222;
  --color-text:        #f5f5f5;
  --color-text-muted:  #888888;
  --color-accent:      #3B82F6;
  --color-accent-dim:  rgba(59, 130, 246, 0.15);
  --color-accent-glow: rgba(59, 130, 246, 0.35);

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;

  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;

  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  --container-max: 1100px;
  --container-pad: var(--space-6);
  --nav-height:    64px;

  --radius-sm:   6px;
  --radius-md:   12px;
  --radius-full: 9999px;

  --transition-fast:   150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow:   400ms ease;

  --shadow-glow: 0 0 24px var(--color-accent-glow);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .fade-in { transition: none !important; }
  .skill-card, .blog-card, .company-logo { transition: none !important; }
}

/* =============================================
   Layout Utilities
   ============================================= */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section {
  padding-block: var(--space-20);
}

.section__heading {
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-10);
}

.section__heading::after {
  content: '';
  display: block;
  width: 36px;
  height: 3px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  margin-top: var(--space-3);
}

/* =============================================
   Buttons
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.625rem var(--space-5);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition-normal),
              color var(--transition-normal),
              border-color var(--transition-normal),
              box-shadow var(--transition-normal);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background: transparent;
  color: var(--color-accent);
  box-shadow: var(--shadow-glow);
}

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

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

.btn--ghost:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

/* =============================================
   Scroll Animations
   ============================================= */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow),
              transform var(--transition-slow);
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* =============================================
   Navigation
   ============================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav__logo {
  font-weight: 700;
  font-size: var(--text-base);
  letter-spacing: -0.01em;
  margin-right: auto;
  color: var(--color-text);
  transition: color var(--transition-fast);
}

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

.nav__links {
  display: none;
  gap: var(--space-6);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

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

.nav__link.is-active {
  color: var(--color-accent);
}

.nav__resume {
  padding: 0.5rem var(--space-4);
}

/* Hamburger */
.nav__hamburger {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 17px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.nav__hamburger span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-text);
  border-radius: var(--radius-full);
  transition: transform var(--transition-normal),
              opacity var(--transition-normal);
}

.nav__hamburger.is-open span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.nav__hamburger.is-open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav__hamburger.is-open span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* Mobile nav drawer */
.nav__links.is-open {
  display: flex;
  flex-direction: column;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-6) var(--space-6);
  gap: var(--space-4);
}

/* =============================================
   Hero
   ============================================= */
.hero {
  padding-top: calc(var(--space-20) + var(--space-8));
  padding-bottom: var(--space-20);
}

.hero__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-10);
  text-align: center;
}

.hero__photo-wrap {
  flex-shrink: 0;
  position: relative;
}

.hero__photo-wrap::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: var(--radius-full);
  background: conic-gradient(
    var(--color-accent),
    var(--color-accent-dim),
    var(--color-accent)
  );
  z-index: -1;
  animation: spin 6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.hero__photo {
  width: 160px;
  height: 160px;
  border-radius: var(--radius-full);
  object-fit: cover;
  background: var(--color-surface-2);
  position: relative;
  z-index: 1;
  border: 3px solid var(--color-bg);
}

.hero__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.hero__greeting {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero__name {
  font-size: var(--text-4xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--color-text);
}

.hero__title {
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--color-text-muted);
}

.hero__bio {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 50ch;
  margin-inline: auto;
  line-height: 1.7;
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-4);
  margin-top: var(--space-2);
}

/* =============================================
   Skills
   ============================================= */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: var(--space-4);
}

.skill-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-6) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: default;
  transition: border-color var(--transition-normal),
              box-shadow var(--transition-normal),
              transform var(--transition-normal);
}

.skill-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

.skill-card__icon {
  width: 48px;
  height: 48px;
  object-fit: contain;
}

.skill-card__label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
}

.skill-card:hover .skill-card__label {
  color: var(--color-text);
}

/* =============================================
   Companies
   ============================================= */
.companies__strip {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  align-items: center;
  justify-content: center;
}

.company-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5) var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  min-width: 140px;
  min-height: 72px;
  transition: border-color var(--transition-normal),
              box-shadow var(--transition-normal);
}

.company-logo:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
}

.company-logo img {
  max-height: 40px;
  max-width: 120px;
  width: auto;
  filter: grayscale(1) brightness(0.8);
  transition: filter var(--transition-normal);
}

.company-logo:hover img {
  filter: grayscale(0) brightness(1);
}

.company-logo__placeholder {
  display: none;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-align: center;
}

/* =============================================
   Blog
   ============================================= */
.blog__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.blog__cta {
  margin-top: var(--space-10);
  text-align: center;
}

/* Post cards */
.blog-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-normal),
              transform var(--transition-normal),
              box-shadow var(--transition-normal);
}

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

.blog-card__thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--color-surface-2);
}

.blog-card__body {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  flex: 1;
}

.blog-card__title {
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
}

.blog-card__date {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.blog-card__link {
  margin-top: auto;
  padding-top: var(--space-3);
  color: var(--color-accent);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: opacity var(--transition-fast);
}

.blog-card__link:hover {
  opacity: 0.8;
  text-decoration: underline;
}

/* Skeleton loading */
.skeleton {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.skeleton__thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
}

.skeleton__body {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.skeleton__block {
  border-radius: var(--radius-sm);
  background: linear-gradient(
    90deg,
    var(--color-surface)   0%,
    var(--color-surface-2) 50%,
    var(--color-surface)   100%
  );
  background-size: 200% 100%;
  animation: shimmer 1.6s ease-in-out infinite;
}

@keyframes shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton__thumb  { height: auto; aspect-ratio: 16 / 9; }
.skeleton__title  { height: 20px; width: 78%; }
.skeleton__date   { height: 14px; width: 42%; }
.skeleton__link   { height: 14px; width: 28%; margin-top: var(--space-3); }

/* Error state */
.blog-error {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-16) var(--space-6);
  color: var(--color-text-muted);
}

.blog-error a {
  color: var(--color-accent);
  font-weight: 500;
}

.blog-error a:hover {
  text-decoration: underline;
}

/* =============================================
   Contact
   ============================================= */
.contact__inner {
  max-width: 540px;
}

.contact__text {
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  margin-bottom: var(--space-8);
  line-height: 1.6;
}

.contact__btn {
  font-size: var(--text-base);
  padding: var(--space-4) var(--space-8);
}

/* =============================================
   Footer
   ============================================= */
.footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-12);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}

.footer__social {
  display: flex;
  gap: var(--space-4);
}

.footer__social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition: color var(--transition-fast),
              border-color var(--transition-fast),
              box-shadow var(--transition-fast);
}

.footer__social a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
}

.footer__copy {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* =============================================
   Responsive — 640px+
   ============================================= */
@media (min-width: 640px) {
  .nav__hamburger { display: none; }
  .nav__links {
    display: flex;
    position: static;
    flex-direction: row;
    background: none;
    border: none;
    padding: 0;
  }

  .hero__inner {
    flex-direction: row;
    text-align: left;
    align-items: center;
  }

  .hero__bio {
    margin-inline: 0;
  }

  .hero__ctas {
    justify-content: flex-start;
  }

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

/* =============================================
   Responsive — 1024px+
   ============================================= */
@media (min-width: 1024px) {
  .hero__photo {
    width: 192px;
    height: 192px;
  }

  .hero__name {
    font-size: var(--text-5xl);
  }

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

  .blog__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}