:root {
  color-scheme: dark;
  --font-sans: "Avenir Next", "Segoe UI", "Helvetica Neue", Helvetica, sans-serif;
  --font-display: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --bg: #060816;
  --bg-elevated: rgba(15, 18, 36, 0.8);
  --bg-soft: rgba(255, 255, 255, 0.04);
  --surface: rgba(14, 18, 35, 0.7);
  --surface-border: rgba(255, 255, 255, 0.08);
  --text: #f3f4fb;
  --text-muted: rgba(232, 235, 249, 0.72);
  --text-soft: rgba(232, 235, 249, 0.5);
  --accent: #80a7ff;
  --accent-strong: #5f88ff;
  --accent-soft: rgba(128, 167, 255, 0.18);
  --glow: rgba(108, 133, 255, 0.28);
  --shadow-lg: 0 24px 80px rgba(0, 0, 0, 0.34);
  --shadow-md: 0 16px 40px rgba(0, 0, 0, 0.24);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4.5rem;
  --space-9: 6rem;
  --max-width: 1180px;
  --transition: 180ms ease;
}

body[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f6fb;
  --bg-elevated: rgba(255, 255, 255, 0.82);
  --bg-soft: rgba(16, 24, 40, 0.05);
  --surface: rgba(255, 255, 255, 0.82);
  --surface-border: rgba(16, 24, 40, 0.08);
  --text: #101522;
  --text-muted: rgba(16, 21, 34, 0.72);
  --text-soft: rgba(16, 21, 34, 0.52);
  --accent: #315ddc;
  --accent-strong: #2048ba;
  --accent-soft: rgba(49, 93, 220, 0.12);
  --glow: rgba(49, 93, 220, 0.16);
  --shadow-lg: 0 24px 70px rgba(38, 53, 93, 0.12);
  --shadow-md: 0 16px 36px rgba(38, 53, 93, 0.1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  background:
    radial-gradient(circle at top left, rgba(85, 109, 221, 0.16), transparent 34%),
    radial-gradient(circle at 85% 16%, rgba(255, 138, 92, 0.14), transparent 28%),
    radial-gradient(circle at 60% 82%, rgba(61, 84, 212, 0.14), transparent 30%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0)),
    var(--bg);
  color: var(--text);
  transition: background-color var(--transition), color var(--transition);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 110px 110px;
  mask-image: radial-gradient(circle at center, black 35%, transparent 92%);
  pointer-events: none;
  opacity: 0.3;
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  border: 0;
  background: none;
  color: inherit;
  cursor: pointer;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

p,
h1,
h2,
h3 {
  margin: 0;
}

.site-shell {
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 0 auto;
  position: relative;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  width: 100%;
  background: transparent;
  backdrop-filter: blur(18px);
}

.site-header__inner {
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: 1.25rem 0 0.75rem;
}

.site-header::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--surface-border), transparent);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.brand-mark {
  width: 2.5rem;
  height: 2.5rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(180deg, var(--accent-soft), rgba(255, 255, 255, 0.04));
  border: 1px solid var(--surface-border);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12);
  color: var(--accent);
  font-size: 0.9rem;
}

.brand-text {
  font-size: 1rem;
}

.header-panel {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0.5rem;
  border-radius: 999px;
  background: var(--bg-elevated);
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow-md);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.site-nav a {
  padding: 0.7rem 1rem;
  border-radius: 999px;
  color: var(--text-muted);
  transition: color var(--transition), background-color var(--transition), transform var(--transition);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--text);
  background: var(--bg-soft);
  transform: translateY(-1px);
}

.menu-toggle {
  display: none;
  width: 3rem;
  height: 3rem;
  border-radius: 999px;
  border: 1px solid var(--surface-border);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-md);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.28rem;
}

.menu-toggle span {
  display: block;
  width: 1.15rem;
  height: 2px;
  margin: 0;
  background: var(--text);
  border-radius: 999px;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.55rem 0.8rem 0.55rem 1rem;
  border-radius: 999px;
  background: var(--bg-soft);
  border: 1px solid var(--surface-border);
  color: var(--text);
}

.theme-toggle__label {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.theme-toggle__track {
  position: relative;
  width: 2.8rem;
  height: 1.6rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
}

body[data-theme="light"] .theme-toggle__track {
  background: rgba(49, 93, 220, 0.16);
}

.theme-toggle__thumb {
  position: absolute;
  top: 0.15rem;
  left: 0.15rem;
  width: 1.3rem;
  height: 1.3rem;
  border-radius: 50%;
  background: linear-gradient(180deg, #ffffff, #d5ddff);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.24);
  transition: transform var(--transition);
}

body[data-theme="light"] .theme-toggle__thumb {
  transform: translateX(1.2rem);
  background: linear-gradient(180deg, #315ddc, #264dbd);
}

.section {
  padding: var(--space-9) 0;
  position: relative;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: var(--space-7);
  align-items: center;
  min-height: calc(100vh - 7rem);
}

.hero-copy {
  max-width: 42rem;
}

.eyebrow {
  margin-bottom: var(--space-4);
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.78rem;
  font-weight: 700;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(3.2rem, 8vw, 5.8rem);
  line-height: 0.94;
  letter-spacing: -0.05em;
}

.hero-subtitle {
  margin-top: var(--space-5);
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  line-height: 1.3;
  color: var(--text-muted);
}

.hero-description {
  margin-top: var(--space-5);
  max-width: 38rem;
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-muted);
}

.hero-actions,
.contact-actions,
.social-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.25rem;
  padding: 0.85rem 1.25rem;
  border-radius: 999px;
  font-weight: 600;
  transition: transform var(--transition), background-color var(--transition), border-color var(--transition);
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #101522;
}

body[data-theme="light"] .button-primary {
  color: #f9fbff;
}

.button-secondary {
  background: var(--bg-soft);
  border: 1px solid var(--surface-border);
  color: var(--text);
}

.button-small {
  min-height: 2.9rem;
  padding-inline: 1.1rem;
}

.hero-highlights {
  display: grid;
  gap: 0.9rem;
  margin-top: var(--space-6);
}

.hero-highlights li {
  position: relative;
  padding-left: 1.35rem;
  color: var(--text-muted);
}

.hero-highlights li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6rem;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 5px var(--accent-soft);
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.hero-visual .signal-card {
  width: min(100%, 32rem);
}

.signal-card,
.project-card,
.detail-card,
.skills-group,
.contact-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02));
  background-color: var(--surface);
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow-lg);
}

.signal-card::before,
.project-card::before,
.contact-card::before {
  content: "";
  position: absolute;
  inset: auto -10% -38% auto;
  width: 220px;
  height: 220px;
  background: radial-gradient(circle, rgba(255, 144, 101, 0.16), transparent 68%);
  pointer-events: none;
}

.signal-card,
.contact-card {
  padding: var(--space-6);
}

.signal-card__label {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.76rem;
  font-weight: 700;
}

.signal-card h2 {
  margin-top: var(--space-4);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1.25;
  letter-spacing: -0.03em;
}

.signal-grid {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.signal-grid span,
.project-card__role,
.detail-card span {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-soft);
}

.signal-grid strong,
.detail-card strong {
  display: block;
  font-size: 1rem;
  line-height: 1.6;
}


.section-heading {
  max-width: 42rem;
}

.section-heading--center {
  margin-inline: auto;
  text-align: center;
}

.section-heading h2 {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 4vw, 3.4rem);
  letter-spacing: -0.04em;
}

.section-heading p:last-child {
  margin-top: var(--space-4);
  color: var(--text-muted);
  line-height: 1.8;
}

.projects-section,
.skills-section,
.contact-section {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-5);
  margin-top: var(--space-6);
}

.project-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  padding: var(--space-6);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.project-card:hover,
.project-card:focus-within {
  transform: translateY(-4px);
  border-color: rgba(128, 167, 255, 0.28);
  box-shadow: 0 26px 60px rgba(0, 0, 0, 0.26);
}

.project-card__top {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  align-items: start;
}

.project-card h3 {
  font-size: 1.45rem;
  letter-spacing: -0.03em;
}

.project-card__badge {
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  white-space: nowrap;
}

.project-card__summary,
.about-copy p {
  color: var(--text-muted);
  line-height: 1.8;
}

.tag-list,
.chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.tag-list li,
.chip-grid li {
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  background: var(--bg-soft);
  border: 1px solid var(--surface-border);
  color: var(--text-muted);
}

.project-points {
  display: grid;
  gap: 0.85rem;
}

.project-points li {
  position: relative;
  padding-left: 1rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.project-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7rem;
  width: 0.35rem;
  height: 0.35rem;
  border-radius: 50%;
  background: #f5a96d;
}

.project-links {
  display: flex;
  gap: 1rem;
  margin-top: auto;
}

.project-links a {
  color: var(--text);
  font-weight: 600;
}

.project-links a:hover,
.project-links a:focus-visible {
  color: var(--accent);
}

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: var(--space-6);
  margin-top: var(--space-6);
}

.about-copy {
  display: grid;
  gap: var(--space-4);
}

.about-details {
  display: grid;
  gap: var(--space-4);
}

.detail-card {
  padding: 1.4rem 1.35rem;
}

.skills-groups {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-5);
  margin-top: var(--space-6);
}

.skills-group {
  padding: var(--space-6);
}

.skills-group h3 {
  margin-bottom: var(--space-4);
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.contact-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.site-footer {
  padding: var(--space-7) 0 var(--space-6);
  text-align: center;
  color: var(--text-soft);
  font-size: 0.94rem;
}

@media (max-width: 1040px) {
  .hero,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .contact-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .project-grid,
  .skills-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero {
    min-height: auto;
    padding-top: var(--space-8);
  }
}

@media (max-width: 760px) {
  .site-shell,
  .site-header__inner {
    width: min(calc(100% - 1.25rem), var(--max-width));
  }

  .site-header__inner {
    flex-wrap: wrap;
    padding-top: 0.9rem;
  }

  .menu-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .header-panel {
    display: none;
    width: 100%;
    border-radius: var(--radius-lg);
    padding: 0.9rem;
    flex-direction: column;
    align-items: stretch;
  }

  .header-panel.is-open {
    display: flex;
  }

  .site-nav {
    flex-direction: column;
    align-items: stretch;
  }

  .site-nav a,
  .theme-toggle {
    justify-content: space-between;
  }

  .hero h1,
  .section-heading h2 {
    max-width: 12ch;
  }

  .about-section .section-heading--center,
  .skills-section .section-heading--center {
    margin-inline: 0;
    text-align: left;
  }

  .project-grid,
  .skills-groups {
    grid-template-columns: 1fr;
  }

  .project-card__top {
    flex-direction: column;
  }

  .section {
    padding: var(--space-8) 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}