:root {
  --color-ink: #0b132b;
  --color-mist: #e5eaf5;
  --color-brand: #3ba3ff;
  --bg: var(--color-ink);
  --surface: rgba(229, 234, 245, 0.06);
  --surface-soft: rgba(229, 234, 245, 0.1);
  --text: var(--color-mist);
  --muted: rgba(229, 234, 245, 0.76);
  --border: rgba(229, 234, 245, 0.2);
  --primary: var(--color-brand);
  --primary-strong: var(--color-brand);
  --accent: var(--color-brand);
  --on-primary: var(--color-ink);
  --glow-1: rgba(59, 163, 255, 0.22);
  --glow-2: rgba(229, 234, 245, 0.14);
  --header-bg: rgba(11, 19, 43, 0.82);
  --shadow: 0 18px 35px rgba(11, 19, 43, 0.55);
  --radius: 16px;
  --radius-sm: 10px;
  --container: 1120px;
  --header-height: 74px;
  --ease: 220ms ease;
}

:root[data-theme="light"] {
  --bg: var(--color-mist);
  --surface: rgba(11, 19, 43, 0.04);
  --surface-soft: rgba(11, 19, 43, 0.08);
  --text: var(--color-ink);
  --muted: rgba(11, 19, 43, 0.72);
  --border: rgba(11, 19, 43, 0.2);
  --primary: var(--color-brand);
  --primary-strong: var(--color-brand);
  --accent: var(--color-brand);
  --header-bg: rgba(229, 234, 245, 0.82);
  --shadow: 0 14px 34px rgba(11, 19, 43, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font: 400 16px/1.65 "IBM Plex Sans", "Segoe UI Variable Text", "Noto Sans", sans-serif;
  text-rendering: optimizeLegibility;
}

body::before,
body::after {
  content: "";
  position: fixed;
  z-index: -1;
  inset: auto auto 0 0;
  width: 42vw;
  height: 42vw;
  border-radius: 999px;
  filter: blur(6px);
  opacity: 0.55;
  pointer-events: none;
  background: radial-gradient(circle, var(--glow-1), transparent 70%);
}
body::after {
  inset: 0 0 auto auto;
  background: radial-gradient(circle, var(--glow-2), transparent 70%);
}

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

a {
  color: var(--primary);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.container {
  width: min(var(--container), calc(100% - 2rem));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: 10px;
  top: -40px;
  background: var(--text);
  color: var(--surface);
  padding: 0.5rem 0.8rem;
  border-radius: 8px;
  z-index: 2000;
}
.skip-link:focus {
  top: 10px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
  background: var(--header-bg);
}

.nav-wrap {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: "Space Grotesk", "Trebuchet MS", sans-serif;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--on-primary);
  font-size: 0.95rem;
}

.site-nav ul {
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 1rem;
  list-style: none;
}
.nav-link {
  color: var(--muted);
  font-weight: 600;
  font-size: 0.94rem;
  padding: 0.3rem 0.2rem;
  border-bottom: 2px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}
.nav-link:hover,
.nav-link.active {
  color: var(--text);
  border-color: var(--primary);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 10px;
  width: 42px;
  height: 42px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  margin: 4px auto;
}

.theme-toggle {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  width: 42px;
  height: 42px;
  border-radius: 10px;
  cursor: pointer;
  transition: transform var(--ease), border-color var(--ease);
}
.theme-toggle:hover {
  transform: translateY(-1px);
  border-color: var(--primary);
}

.section {
  padding: 5.2rem 0;
}

.section-head {
  margin-bottom: 1.4rem;
}
.section-kicker {
  margin: 0 0 0.35rem;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
}
.section-head h2 {
  margin: 0;
  font-family: "Space Grotesk", "Segoe UI Variable Display", sans-serif;
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  line-height: 1.2;
}

.hero {
  padding-top: 4.2rem;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: 2rem;
}
.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--muted);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.hero h1 {
  margin: 0;
  font-family: "Space Grotesk", "Segoe UI Variable Display", sans-serif;
  line-height: 1.05;
  font-size: clamp(2rem, 7vw, 3.7rem);
}
.hero-title {
  margin: 0.45rem 0 0.7rem;
  color: var(--primary);
  font-weight: 700;
  font-size: 1.1rem;
}
.hero-tagline {
  margin: 0;
  max-width: 60ch;
  color: var(--muted);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.2rem 0 1.4rem;
}
.chip {
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.45rem 0.8rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.social-links {
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.65rem;
  list-style: none;
}
.social-links a {
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 0.45rem 0.75rem;
  border-radius: 9px;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.88rem;
  transition: transform var(--ease), border-color var(--ease);
}
.social-links a:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
}

.hero-photo-card {
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: linear-gradient(145deg, var(--surface), var(--surface-soft));
  box-shadow: var(--shadow);
  padding: 0.65rem;
}
.hero-photo-card img {
  border-radius: 16px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
}
.card:hover {
  transform: translateY(-3px);
  border-color: rgba(59, 163, 255, 0.45);
}

.two-col {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.two-col h3 {
  margin: 0 0 0.3rem;
  font-size: 1rem;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}
.skill-card h3 {
  margin-top: 0;
}

.tag-list {
  margin: 0.8rem 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}
.tag-list li {
  background: var(--surface-soft);
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 999px;
  padding: 0.3rem 0.65rem;
  font-size: 0.82rem;
  font-weight: 600;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1rem;
}
.filter-btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 0.48rem 0.9rem;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 700;
  transition: all var(--ease);
}
.filter-btn:hover,
.filter-btn.is-active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--on-primary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 1rem;
}
.project-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.project-card h3 {
  margin: 0;
  font-size: 1.05rem;
}
.project-card p {
  margin: 0;
  color: var(--muted);
}
.project-card.is-hidden {
  display: none;
}

.project-actions,
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: auto;
}

.meta {
  margin: 0.3rem 0 0.8rem;
  color: var(--muted);
  font-weight: 600;
}
.bullet-list {
  margin: 0;
  padding-left: 1.2rem;
}
.bullet-list li + li {
  margin-top: 0.48rem;
}

.profiles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}
.profiles-grid h3 {
  margin-top: 0;
}

.contact-card p {
  margin: 0 0 0.8rem;
}
.copy-status {
  min-height: 1.2rem;
  margin: 0.8rem 0 0;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.9rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.2rem 0 2rem;
  color: var(--muted);
  text-align: center;
  font-size: 0.9rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.contact-form-card {
  margin-top: 1rem;
}
.contact-form-card h3 {
  margin-top: 0;
}
.card-sub {
  margin: 0.2rem 0 1.2rem;
  color: var(--muted);
  font-size: 0.94rem;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1rem;
}
.form-field label {
  font-weight: 600;
  font-size: 0.9rem;
}
.form-field input,
.form-field textarea {
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font: inherit;
  font-size: 0.95rem;
  padding: 0.6rem 0.8rem;
  outline: none;
  transition: border-color var(--ease);
  resize: vertical;
}
.form-field input::placeholder,
.form-field textarea::placeholder {
  color: var(--muted);
  opacity: 0.7;
}
.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--primary);
}
.form-field input:invalid:not(:placeholder-shown),
.form-field textarea:invalid:not(:placeholder-shown) {
  border-color: rgba(255, 80, 80, 0.6);
}

.form-status {
  min-height: 1.2rem;
  margin: 0 0 0.8rem;
  font-weight: 700;
  font-size: 0.9rem;
}
.form-status.is-success { color: #4dde96; }
.form-status.is-error   { color: #ff6b6b; }

.btn {
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.58rem 0.95rem;
  font-weight: 700;
  font-size: 0.9rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease), background var(--ease);
  cursor: pointer;
}
.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: var(--on-primary);
  box-shadow: 0 10px 20px rgba(59, 163, 255, 0.26);
}
.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 940px) {
  .nav-toggle {
    display: inline-block;
  }
  .site-nav {
    position: absolute;
    top: calc(var(--header-height) - 4px);
    left: 1rem;
    right: 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.9rem;
    transform-origin: top;
    transform: scaleY(0.9);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--ease), opacity var(--ease);
  }
  .site-nav.open {
    transform: scaleY(1);
    opacity: 1;
    pointer-events: auto;
  }
  .site-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.7rem;
  }
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .hero-photo-card {
    max-width: 340px;
  }
}

@media (max-width: 700px) {
  .section {
    padding: 4rem 0;
  }
  .two-col {
    grid-template-columns: 1fr;
  }
  .hero-actions .btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation: none !important;
    transition-duration: 0.01ms !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}