/* =========================================================
   Design tokens: light theme on :root, dark theme below.
   ========================================================= */
:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #eef1f4;
  --text: #0e1726;
  --muted: #4a5568;
  --border: #dfe4ea;
  --accent: #0b7a6e;
  --accent-strong: #08665c;
  --accent-soft: #e0f3f0;
  --on-accent: #ffffff;
  --code-bg: #0f172a;
  --code-text: #e2e8f0;
  --code-dim: #94a3b8;
  --code-key: #7dd3fc;
  --code-str: #fcd34d;
  --code-ok: #4ade80;
  --shadow: 0 1px 2px rgb(15 23 42 / 0.04), 0 6px 20px rgb(15 23 42 / 0.05);
  --radius: 14px;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1120;
    --surface: #111a2e;
    --surface-2: #18233b;
    --text: #e5e9f0;
    --muted: #9aa5b8;
    --border: #233150;
    --accent: #2dd4bf;
    --accent-strong: #5eead4;
    --accent-soft: rgb(45 212 191 / 0.12);
    --on-accent: #042f2a;
    --code-bg: #070c18;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.3);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0b1120;
  --surface: #111a2e;
  --surface-2: #18233b;
  --text: #e5e9f0;
  --muted: #9aa5b8;
  --border: #233150;
  --accent: #2dd4bf;
  --accent-strong: #5eead4;
  --accent-soft: rgb(45 212 191 / 0.12);
  --on-accent: #042f2a;
  --code-bg: #070c18;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.3);
  color-scheme: dark;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--accent);
  text-underline-offset: 3px;
}

a:hover {
  color: var(--accent-strong);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

code,
pre {
  font-family: var(--font-mono);
}

p code,
li code {
  font-size: 0.875em;
  padding: 0.1em 0.35em;
  border-radius: 5px;
  background: var(--surface-2);
}

.container {
  width: 100%;
  max-width: 72rem;
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

.icon {
  width: 1.15rem;
  height: 1.15rem;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 600;
}

.skip-link:focus {
  top: 1rem;
  color: var(--on-accent);
}

/* =========================================================
   Header
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 4rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}

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

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 8px;
  background: var(--accent);
  color: var(--on-accent);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
}

.site-nav {
  margin-left: auto;
}

.site-nav ul {
  display: flex;
  gap: 0.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  display: block;
  padding: 0.45rem 0.75rem;
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--text);
  background: var(--surface-2);
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

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

.theme-toggle {
  margin-left: 0.5rem;
}

.nav-toggle {
  display: none;
}

.theme-toggle .icon-sun {
  display: none;
}

:root[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

:root[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun {
    display: block;
  }

  :root:not([data-theme="light"]) .theme-toggle .icon-moon {
    display: none;
  }
}

@media (max-width: 760px) {
  .nav-toggle {
    display: grid;
  }

  .theme-toggle {
    margin-left: auto;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    margin: 0;
    padding: 0.5rem clamp(1rem, 4vw, 2rem) 1rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }

  .site-nav.open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
  }

  .site-nav a {
    padding: 0.7rem 0.75rem;
    font-size: 1rem;
  }
}

/* =========================================================
   Hero
   ========================================================= */
.hero {
  padding-block: clamp(3rem, 8vw, 6rem) clamp(3rem, 7vw, 5rem);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: center;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

.hero h1 {
  font-size: clamp(2.5rem, 6.5vw, 4.25rem);
  font-weight: 800;
  letter-spacing: -0.035em;
}

.role {
  margin: 0.5rem 0 1.25rem;
  color: var(--muted);
  font-size: clamp(1.25rem, 2.6vw, 1.6rem);
  font-weight: 600;
}

.lede {
  max-width: 38rem;
  margin: 0 0 1.5rem;
  font-size: 1.125rem;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 1.75rem;
  padding: 0.4rem 0.9rem;
  border-radius: 12px;
  background: var(--accent-soft);
  font-size: 0.9rem;
  font-weight: 500;
}

.status-dot {
  flex: none;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 0 3px rgb(34 197 94 / 0.25);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.15rem;
  border: 1px solid transparent;
  border-radius: 10px;
  font: inherit;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, transform 0.15s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: var(--on-accent);
}

.btn-primary:hover {
  background: var(--accent-strong);
  color: var(--on-accent);
}

.btn-secondary {
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
}

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

.social {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* Terminal card */
.terminal {
  overflow: hidden;
  border: 1px solid rgb(255 255 255 / 0.06);
  border-radius: var(--radius);
  background: var(--code-bg);
  color: var(--code-text);
  box-shadow: 0 18px 50px rgb(2 6 23 / 0.22);
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.75rem 1rem;
  background: rgb(255 255 255 / 0.04);
  border-bottom: 1px solid rgb(255 255 255 / 0.06);
}

.terminal-bar .dot {
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: #f87171;
}

.terminal-bar .dot:nth-child(2) {
  background: #fbbf24;
}

.terminal-bar .dot:nth-child(3) {
  background: #34d399;
}

.terminal-title {
  margin-left: 0.5rem;
  color: var(--code-dim);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.terminal pre {
  margin: 0;
  padding: 1.25rem 1.4rem 1.5rem;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.75;
}

.t-prompt { color: var(--code-ok); }
.t-key { color: var(--code-key); }
.t-str { color: var(--code-str); }
.t-ok { color: var(--code-ok); }

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 480px) {
  .terminal pre {
    padding: 1rem;
    font-size: 0.76rem;
  }
}

/* =========================================================
   Sections and cards
   ========================================================= */
.section {
  padding-block: clamp(3.5rem, 8vw, 5.5rem);
  border-top: 1px solid var(--border);
}

.section-head {
  max-width: 44rem;
  margin-bottom: 2rem;
}

.section-kicker {
  margin: 0 0 0.5rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}

.section-head h2,
.contact-card h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.35rem);
  font-weight: 750;
}

.section-head p:not(.section-kicker) {
  margin: 0.75rem 0 0;
  color: var(--muted);
}

.card {
  padding: clamp(1.25rem, 3vw, 1.75rem);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.card h3 {
  font-size: 1.2rem;
}

.card p {
  margin: 0.75rem 0 0;
}

.bullets {
  margin: 0.85rem 0 1.25rem;
  padding-left: 1.2rem;
}

.bullets li + li {
  margin-top: 0.4rem;
}

.bullets li::marker {
  color: var(--accent);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tags li {
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-2);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

/* Experience */
.stack {
  display: grid;
  gap: 1.25rem;
}

.card.featured {
  border-left: 4px solid var(--accent);
}

.card-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.25rem 1.5rem;
}

.card .org {
  margin: 0 0 0.3rem;
  color: var(--accent);
  font-size: 0.95rem;
  font-weight: 600;
}

.card .dates {
  margin: 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* Projects */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 21rem), 1fr));
  gap: 1.25rem;
}

.project {
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s, transform 0.15s;
}

.project:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  transform: translateY(-2px);
}

.project-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.badge {
  flex: none;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.project .summary {
  color: var(--muted);
}

.project .links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  margin-top: auto;
  padding-top: 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
}

/* Full-width project card with an embedded video */
.project-wide {
  grid-column: 1 / -1;
}

.project-wide:hover {
  transform: none; /* don't shift the player while someone is using it */
}

.project-media {
  margin-top: 1rem;
}

.video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 0;
  border-radius: 10px;
  background: var(--code-bg);
}

/* Wide screens: text on the left, video on the right */
@media (min-width: 860px) {
  .project-wide {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    grid-template-rows: auto auto auto auto 1fr;
    column-gap: 2rem;
  }

  .project-wide > * {
    grid-column: 1;
  }

  .project-wide .project-media {
    grid-column: 2;
    grid-row: 1 / -1;
    align-self: center;
    margin-top: 0;
  }
}

/* Skills */
.skill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 16rem), 1fr));
  gap: 1rem;
}

.skill-group h3 {
  margin-bottom: 0.85rem;
  font-size: 1rem;
}

.cert-line {
  margin: 1.5rem 0 0;
  color: var(--muted);
}

/* Pipeline */
.pipeline {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.pipeline li {
  position: relative;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

/* Arrow between steps */
.pipeline li:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -0.95rem;
  width: 0.6rem;
  height: 0.6rem;
  border-top: 2px solid var(--accent);
  border-right: 2px solid var(--accent);
  transform: translateY(-50%) rotate(45deg);
}

.step-num {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
}

.pipeline h3 {
  margin: 0.35rem 0 0.4rem;
  font-size: 1.05rem;
}

.pipeline p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.infra-note {
  margin: 1.75rem 0 0;
  color: var(--muted);
}

.infra-note a {
  font-weight: 600;
  white-space: nowrap;
}

@media (max-width: 960px) {
  .pipeline {
    grid-template-columns: minmax(0, 1fr);
  }

  .pipeline li:not(:last-child)::after {
    top: auto;
    right: auto;
    bottom: -0.95rem;
    left: 1.6rem;
    transform: rotate(135deg);
  }
}

/* Contact */
.contact-card {
  padding: clamp(2rem, 6vw, 3.5rem);
  background:
    radial-gradient(120% 140% at 0% 0%, var(--accent-soft), transparent 60%),
    var(--surface);
  text-align: center;
}

.contact-card > p:not(.section-kicker) {
  max-width: 36rem;
  margin: 0.85rem auto 1.75rem;
  color: var(--muted);
}

.contact-card .actions {
  justify-content: center;
}

/* =========================================================
   Footer and 404
   ========================================================= */
.site-footer {
  padding-block: 1.75rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.25rem 1.5rem;
}

.footer-inner p {
  margin: 0;
}

.not-found {
  display: grid;
  min-height: 100vh;
  align-items: center;
}

.not-found h1 {
  font-size: clamp(4rem, 14vw, 8rem);
  font-weight: 800;
  letter-spacing: -0.05em;
}

/* =========================================================
   Motion preferences
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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

  .btn:hover,
  .project:hover {
    transform: none;
  }
}