/* Base */
:root {
  --ink: #102451;
  --muted: #5d6b85;
  --line: #d9e2f2;
  --paper: #f5f8ff;
  --white: #fff;
  --surface: #fff;
  --on-accent-surface: #fff;
  --header-bg: rgba(255, 255, 255, 0.9);
  --header-border: rgba(217, 226, 242, 0.9);
  --accent: #0f41cd;
  --accent-dark: #0b329f;
  --focus: #80a3ff;
  --radius: 18px;
  --shadow: 0 18px 50px rgba(15, 65, 205, 0.1);
}
html[data-theme="dark"] {
  color-scheme: dark;
  --ink: #edf3ff;
  --muted: #b4c2dc;
  --line: #2c4070;
  --paper: #101a31;
  --white: #0b1327;
  --surface: #14213f;
  --header-bg: rgba(11, 19, 39, 0.92);
  --header-border: rgba(44, 64, 112, 0.9);
  --accent: #7196ff;
  --accent-dark: #4d78f1;
  --focus: #b7caff;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.24);
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--white);
  color: var(--ink);
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  font-size: 16px;
  line-height: 1.6;
}
a {
  color: inherit;
  text-decoration: none;
}
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}
.container {
  width: min(1120px, calc(100% - 48px));
  margin-inline: auto;
}
.narrow {
  max-width: 760px;
}
.section {
  padding: 112px 0;
}
.section-muted {
  background: var(--paper);
}
h1,
h2,
h3,
p {
  margin-top: 0;
}
h1 {
  max-width: 900px;
  font-size: clamp(2.8rem, 6vw, 5.6rem);
  letter-spacing: -0.065em;
  line-height: 0.99;
}
h1 em {
  font-family: Georgia, serif;
  font-weight: 400;
  color: var(--accent);
}
h2 {
  font-size: clamp(2rem, 3.6vw, 3.35rem);
  letter-spacing: -0.05em;
  line-height: 1.06;
}
h3 {
  font-size: 1.25rem;
  letter-spacing: -0.025em;
}
.eyebrow,
.project-type {
  margin-bottom: 15px;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  top: 12px;
  left: 12px;
  z-index: 5;
  padding: 10px;
  background: var(--surface);
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}
/* Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--header-border);
  background: var(--header-bg);
  backdrop-filter: blur(12px);
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
}
.brand {
  font-size: 1.2rem;
  font-weight: 850;
  letter-spacing: -0.08em;
}
.brand span {
  color: var(--accent);
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 0.9rem;
  font-weight: 650;
}
.main-nav a:not(.nav-cta) {
  position: relative;
}
.main-nav a:not(.nav-cta)::after {
  position: absolute;
  right: 0;
  bottom: -6px;
  left: 0;
  height: 1px;
  background: var(--ink);
  content: "";
  transform: scaleX(0);
  transition: transform 0.2s;
}
.main-nav a:hover::after,
.main-nav a.active:not(.nav-cta)::after {
  transform: scaleX(1);
}
.nav-cta {
  padding: 9px 15px;
  border-radius: 99px;
  background: var(--accent);
  color: #fff;
}
.menu-toggle {
  display: none;
  border: 0;
  background: none;
  cursor: pointer;
}
.menu-toggle span:not(.sr-only) {
  display: block;
  width: 25px;
  height: 2px;
  margin: 5px;
  background: var(--ink);
}
.theme-toggle {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 1.05rem;
  cursor: pointer;
  transition:
    transform 0.2s,
    border-color 0.2s,
    background 0.2s;
}
.theme-toggle:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}
/* Home */
.hero {
  padding-top: 130px;
  padding-bottom: 112px;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.75fr) minmax(240px, 0.65fr);
  align-items: end;
  gap: 76px;
}
.hero-copy {
  max-width: 690px;
  margin: 30px 0;
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--muted);
}
.actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}
.button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 19px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-size: 0.93rem;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 0.2s,
    background 0.2s;
}
.button:hover {
  transform: translateY(-2px);
  background: var(--accent-dark);
}
.button-light {
  border-color: #fff;
  background: var(--on-accent-surface);
  color: var(--ink);
}

.button-light:hover {
  transform: translateY(-2px);
  background: var(--accent-dark);
  color: #fff;
}

.text-link {
  font-weight: 700;
}
.text-link span {
  display: inline-block;
  transition: transform 0.2s;
}
.text-link:hover span {
  transform: translateX(4px);
}
.hero-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow);
}
.hero-card__number {
  margin-bottom: 0;
  color: var(--accent);
  font-size: 4rem;
  font-weight: 800;
  letter-spacing: -0.09em;
  line-height: 1;
}
.hero-card__label {
  max-width: 150px;
  font-size: 0.88rem;
  font-weight: 700;
}
.hero-card__line {
  height: 1px;
  margin: 28px 0;
  background: var(--line);
}
.hero-card p:last-child {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.87rem;
}
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 48px;
}
.service-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}
.service-card span {
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 800;
}
.service-card h3 {
  margin: 18px 0 8px;
}
.service-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}
.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 30px;
  margin-bottom: 32px;
}
.section-heading h2 {
  margin-bottom: 0;
}
.project-list {
  border-top: 1px solid var(--line);
}
.project-row {
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr) 210px;
  gap: 24px;
  padding: 31px 0;
  border-bottom: 1px solid var(--line);
}
.project-index {
  color: var(--accent);
  font-family: Georgia, serif;
  font-size: 1.3rem;
}
.project-row h3 {
  margin-bottom: 7px;
  font-size: 1.5rem;
}
.project-row div p:last-child {
  margin-bottom: 0;
  color: var(--muted);
}
.project-stack {
  align-self: center;
  color: var(--muted);
  font-size: 0.84rem;
}
.cta-section {
  padding-top: 0;
}
.cta-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  padding: 56px 64px;
  border-radius: var(--radius);
  background: var(--accent);
  color: #fff;
}
.cta-box .eyebrow {
  color: #dce7ff;
}
.cta-box h2 {
  margin: 0;
}
/* Repository link */
.repository-section {
  padding: 0 0 82px;
}
.repository-callout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
  padding: 40px 44px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  background: var(--surface);
}
.repository-callout h2 {
  margin-bottom: 10px;
  font-size: clamp(1.7rem, 3vw, 2.45rem);
}
.repository-callout p:last-child {
  max-width: 630px;
  margin-bottom: 0;
  color: var(--muted);
}
.github-button {
  display: inline-flex;
  flex: none;
  align-items: center;
  gap: 10px;
  padding: 13px 17px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 0.92rem;
  font-weight: 750;
  transition:
    transform 0.2s,
    background 0.2s;
}
.github-button:hover {
  transform: translateY(-2px);
  background: var(--accent-dark);
}
.github-button span:first-child {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}
/* Interior pages */
.page-intro {
  padding: 104px 0 82px;
}
.page-intro p:last-child {
  max-width: 720px;
  color: var(--muted);
  font-size: 1.15rem;
}
.two-column {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 10%;
  align-items: start;
}
.timeline {
  border-top: 1px solid var(--line);
}
.timeline article {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.timeline p {
  margin-bottom: 6px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}
.timeline h3 {
  margin-bottom: 4px;
}
.timeline span {
  color: var(--muted);
  font-size: 0.94rem;
}
.skill-groups {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}
.skill-groups div {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.skill-groups h3 {
  margin-bottom: 7px;
}
.skill-groups p {
  margin: 0;
  color: var(--muted);
}
.case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}
.case-card {
  min-height: 345px;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  transition:
    transform 0.25s,
    box-shadow 0.25s;
}
.case-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
}
.case-card h2 {
  margin-bottom: 14px;
  font-size: 1.8rem;
}
.case-card > p:not(.project-type):not(.tag-list) {
  color: var(--muted);
}
.case-card ul {
  padding-left: 19px;
  color: var(--muted);
  font-size: 0.91rem;
}
.tag-list {
  margin-top: 24px !important;
  color: var(--accent) !important;
  font-size: 0.77rem;
  font-weight: 750;
  letter-spacing: 0.04em;
}
/* Contact & footer */
.contact-grid {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: 10%;
  align-items: start;
}
.contact-details h2 {
  font-size: 2rem;
}
.contact-details a {
  display: block;
  margin-bottom: 8px;
  color: var(--accent);
  font-weight: 700;
}
.contact-details p {
  margin-top: 22px;
  color: var(--muted);
}
.contact-form {
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.contact-form label {
  display: block;
  margin-bottom: 18px;
  font-size: 0.85rem;
  font-weight: 750;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.contact-form input,
.contact-form textarea {
  display: block;
  width: 100%;
  margin-top: 7px;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 1rem;
  transition: border-color 0.2s;
}
.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--accent);
  outline: none;
}
.contact-form textarea {
  resize: vertical;
}
.form-status {
  min-height: 1.4em;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}
.site-footer {
  padding: 44px 0;
  border-top: 1px solid var(--line);
}
.footer-content {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  align-items: center;
  font-size: 0.88rem;
}
.footer-content p {
  margin: 0;
  color: var(--muted);
}
.footer-content div {
  display: flex;
  gap: 18px;
  font-weight: 700;
}
.footer-content small {
  grid-column: 1/-1;
  color: var(--muted);
}
/* Motion and responsive */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 0.55s ease,
    transform 0.55s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  *,
  html {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}
@media (max-width: 720px) {
  .container {
    width: min(100% - 34px, 1120px);
  }
  .section {
    padding: 72px 0;
  }
  .site-header {
    min-height: 64px;
  }
  .main-nav {
    position: absolute;
    top: 64px;
    right: 17px;
    left: 17px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--surface);
    box-shadow: var(--shadow);
  }
  .main-nav.is-open {
    display: flex;
  }
  .main-nav a {
    padding: 11px;
  }
  .main-nav a::after {
    display: none;
  }
  .nav-cta {
    text-align: center;
  }
  .theme-toggle {
    width: 100%;
    height: 40px;
    border-radius: 6px;
  }
  .menu-toggle {
    display: block;
  }
  .hero {
    padding-top: 84px;
  }
  .hero-grid,
  .two-column,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-card {
    max-width: 350px;
  }
  .service-grid,
  .case-grid {
    grid-template-columns: 1fr;
  }
  .section-heading {
    align-items: start;
    flex-direction: column;
  }
  .project-row {
    grid-template-columns: 40px 1fr;
    gap: 12px;
  }
  .project-stack {
    grid-column: 2;
    font-size: 0.78rem;
  }
  .cta-box {
    align-items: start;
    flex-direction: column;
    padding: 38px 30px;
  }
  .repository-section {
    padding-bottom: 60px;
  }
  .repository-callout {
    align-items: flex-start;
    flex-direction: column;
    gap: 24px;
    padding: 30px;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .footer-content {
    grid-template-columns: 1fr;
    gap: 13px;
  }
  .footer-content small {
    grid-column: auto;
  }
}