/* ==========================================================================
   TOKENS
   Adjust these to re-theme the entire site from one place.
   ========================================================================== */
:root {
  /* Color */
  --primary: #0A66C2;
  --primary-dark: #084d94;
  --navy: #0B1F3A;
  --slate: #475569;
  --slate-light: #64748B;
  --cyan: #0EA5E9;
  --white: #FFFFFF;
  --bg: #F6F8FA;
  --bg-alt: #F0F3F7;
  --border: #E2E8F0;
  --text: #1B2430;
  --text-muted: #52606D;

  /* Type */
  --font-display: 'Manrope', 'IBM Plex Sans', sans-serif;
  --font-body: 'IBM Plex Sans', -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  /* Layout */
  --container-w: 1160px;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow-sm: 0 1px 2px rgba(11, 31, 58, 0.06);
  --shadow-md: 0 4px 16px rgba(11, 31, 58, 0.08);
  --header-h: 72px;
  --transition: 180ms ease;
}

/* ==========================================================================
   RESET
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body, h1, h2, h3, p, ul, figure { margin: 0; }
ul { padding: 0; list-style: none; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

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

.container {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: 24px;
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--navy);
  color: var(--white);
  padding: 10px 16px;
  z-index: 1000;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }

/* Visible focus states everywhere */
a:focus-visible,
button:focus-visible,
.tab:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   TYPE SCALE
   ========================================================================== */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 10px;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 2.4vw, 2.1rem);
  color: var(--navy);
  letter-spacing: -0.01em;
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}
.btn--primary {
  background: var(--primary);
  color: var(--white);
}
.btn--primary:hover { background: var(--primary-dark); }
.btn--outline {
  background: transparent;
  color: var(--navy);
  border-color: var(--border);
}
.btn--outline:hover { border-color: var(--primary); color: var(--primary); }

/* ==========================================================================
   HEADER / NAV
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 500;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: saturate(140%) blur(6px);
  border-bottom: 1px solid var(--border);
}

.navbar {
  height: var(--header-h);
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: 24px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--navy);
  margin-right: auto;
}
.navbar__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: var(--navy);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.navbar__links {
  display: flex;
  gap: 28px;
}
.nav-link {
  position: relative;
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 6px 2px;
  transition: color var(--transition);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -4px;
  height: 2px; width: 0;
  background: var(--primary);
  transition: width var(--transition);
}
.nav-link:hover { color: var(--navy); }
.nav-link.is-active { color: var(--navy); }
.nav-link.is-active::after { width: 100%; }

.navbar__actions { display: flex; gap: 14px; }
.icon-link {
  display: inline-flex;
  color: var(--slate);
  transition: color var(--transition);
}
.icon-link:hover { color: var(--primary); }

/* Hamburger (mobile) */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  padding: 0;
}
.hamburger span {
  display: block;
  height: 2px;
  background: var(--navy);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================================
   HERO
   ========================================================================== */
.hero {
  position: relative;
  padding: 108px 0 96px;
  overflow: hidden;
  background: linear-gradient(180deg, var(--navy) 0%, #102544 100%);
  color: var(--white);
}

/* Subtle technology-inspired backdrop: faint dot grid, no motion */
.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(255,255,255,0.07) 1px, transparent 1px);
  background-size: 26px 26px;
  mask-image: radial-gradient(ellipse at 70% 30%, black 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner { position: relative; max-width: 760px; }

.hero .eyebrow { color: var(--cyan); }

.hero__headline {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  letter-spacing: -0.01em;
  line-height: 1.25;
  color: var(--white);
  margin-bottom: 20px;
}
.hero__divider { color: var(--cyan); font-weight: 400; margin-inline: 4px; }

.hero__intro {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.78);
  max-width: 560px;
  margin-bottom: 34px;
}

.hero__actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero .btn--outline { color: var(--white); border-color: rgba(255,255,255,0.3); }
.hero .btn--outline:hover { border-color: var(--cyan); color: var(--cyan); }

/* Signature element: quiet signal-line motif referencing monitoring/telemetry */
.hero__signal {
  position: relative;
  display: block;
  width: 100%;
  height: 56px;
  margin-top: 56px;
}
.hero__signal path {
  fill: none;
  stroke: rgba(14, 165, 233, 0.55);
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 1600;
  stroke-dashoffset: 1600;
  animation: draw-signal 2.4s ease-out forwards 0.3s;
}
@keyframes draw-signal {
  to { stroke-dashoffset: 0; }
}

/* ==========================================================================
   ABOUT
   ========================================================================== */
.about { padding: 96px 0; background: var(--white); }

.about__grid {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 64px;
  align-items: start;
}

.about__photo {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--bg-alt);
  border: 1px solid var(--border);
}

.about__content p { color: var(--text-muted); margin-top: 16px; max-width: 62ch; }
.about__content .section-title { margin-top: 4px; }

.about__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}

/* ==========================================================================
   PROJECTS
   ========================================================================== */
.projects { padding: 96px 0 110px; background: var(--bg); }

.projects__intro {
  color: var(--text-muted);
  max-width: 60ch;
  margin-top: 14px;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 36px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 16px;
}

.tab {
  background: var(--white);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.88rem;
  padding: 9px 16px;
  border-radius: 999px;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.tab:hover { color: var(--navy); border-color: var(--slate-light); }
.tab.is-active {
  background: var(--navy);
  border-color: var(--navy);
  color: var(--white);
}

.tab-panel { margin-top: 32px; }
.tab-panel[hidden] { display: none; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: #CBD8E8;
}

.card__title {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 8px;
}
.card__desc { color: var(--text-muted); font-size: 0.94rem; margin-bottom: 16px; }
.card__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--slate-light);
  margin-top: 14px;
  margin-bottom: 6px;
}
.card__text { font-size: 0.9rem; color: var(--text-muted); }

.tag-list { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: var(--bg-alt);
  color: var(--navy);
  padding: 4px 9px;
  border-radius: var(--radius-sm);
}
.tag--outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
}

/* Scroll-reveal (very subtle, respects reduced motion) */
.card, .about__grid, .hero__inner {
  opacity: 0;
  transform: translateY(10px);
}
.is-visible {
  animation: reveal 0.5s ease forwards;
}
@keyframes reveal {
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .card, .about__grid, .hero__inner { opacity: 1; transform: none; animation: none; }
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer { background: var(--navy); color: rgba(255,255,255,0.85); padding: 56px 0 24px; }

.footer__grid {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 24px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}

.footer__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--white);
}
.footer__tagline { font-size: 0.88rem; color: rgba(255,255,255,0.6); margin-top: 4px; }

.footer__contact { display: flex; gap: 20px; flex-wrap: wrap; }
.footer__contact a { font-size: 0.9rem; transition: color var(--transition); }
.footer__contact a:hover { color: var(--cyan); }

.footer__bottom {
  padding-top: 20px;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
}

/* ==========================================================================
   PRINT (CV button area prints cleanly if page is printed)
   ========================================================================== */
@media print {
  .site-header, .hero__signal, .hero__grid, .navbar__actions, .hamburger { display: none !important; }
  body { color: #000; }
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 900px) {
  .about__grid { grid-template-columns: 1fr; }
  .about__media { max-width: 260px; }
}

@media (max-width: 780px) {
  .hamburger { display: flex; }

  .navbar__links {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    gap: 0;
    padding: 8px 24px 20px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition), transform var(--transition);
  }
  .navbar__links.is-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .navbar__links li { border-bottom: 1px solid var(--border); }
  .navbar__links li:last-child { border-bottom: none; }
  .nav-link { display: block; padding: 14px 2px; }

  .navbar__actions { margin-left: 0; }

  .hero { padding: 88px 0 64px; }
  .about, .projects { padding: 64px 0; }

  .tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 14px;
  }
  .tab { flex: none; }
}

@media (max-width: 480px) {
  .hero__actions { flex-direction: column; align-items: stretch; }
  .about__actions { flex-direction: column; align-items: stretch; }
}