:root {
  color-scheme: light;
  --paper: #f6f3ee;
  --surface: rgba(255, 252, 246, .72);
  --surface-strong: #fffdf8;
  --ink: #181612;
  --muted: #6f695f;
  --soft-muted: #8c857b;
  --accent: #395b50;
  --line: rgba(24, 22, 18, .14);
  --line-strong: rgba(24, 22, 18, .24);
  --footer: #181612;
  --console: #181612;
  --footer-text: rgba(246, 243, 238, .72);
  --footer-strong: #f6f3ee;
  --shadow: 0 18px 50px rgba(24, 22, 18, .08);
  --max: 1120px;
  --gutter: 50px;
  --radius: 8px;
  --ease: 180ms ease;
}

[data-theme="dark"] {
  color-scheme: dark;
  --paper: #161714;
  --surface: rgba(31, 34, 29, .82);
  --surface-strong: #20231e;
  --ink: #f3f0e9;
  --muted: #aaa69b;
  --soft-muted: #858177;
  --accent: #9ab7a2;
  --line: rgba(243, 240, 233, .14);
  --line-strong: rgba(243, 240, 233, .28);
  --footer: #0e0f0d;
  --console: #0e0f0d;
  --footer-text: rgba(246, 243, 238, .72);
  --shadow: 0 18px 50px rgba(0, 0, 0, .24);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Geist, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  transition: background-color var(--ease), color var(--ease);
}
a { color: inherit; text-decoration: none; }
button { font: inherit; }
img { display: block; max-width: 100%; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }

.shell {
  width: min(calc(100% - 100px), var(--max));
  margin: 0 auto;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  padding: 24px 0 20px;
}
.brand { font-weight: 700; letter-spacing: -.03em; }
.nav-right { display: flex; align-items: center; gap: 24px; }
.nav-links { display: flex; align-items: center; gap: 18px; color: var(--muted); font-size: .95rem; }
.nav-links a { transition: color var(--ease); }
.nav-links a:hover { color: var(--ink); }

.theme-toggle,
.menu-toggle,
.icon-link {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  transition: border-color var(--ease), background-color var(--ease), transform var(--ease);
}
.theme-toggle:hover,
.menu-toggle:hover,
.icon-link:hover { border-color: var(--line-strong); transform: translateY(-1px); }
.theme-toggle svg, .menu-toggle svg, .icon-link svg { width: 18px; height: 18px; }
.theme-toggle .sun { display: none; }
[data-theme="dark"] .theme-toggle .moon { display: none; }
[data-theme="dark"] .theme-toggle .sun { display: block; }
.menu-toggle { display: none; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 420px);
  align-items: center;
  gap: clamp(40px, 8vw, 110px);
  min-height: min(760px, calc(100svh - 76px));
  padding: 68px 0 100px;
}
.eyebrow {
  margin: 0 0 18px;
  color: var(--accent);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .14em;
  line-height: 1.5;
  text-transform: uppercase;
}
h1, h2, h3, p { margin-top: 0; }
h1, h2 { font-weight: 400; letter-spacing: -.055em; }
h1 {
  max-width: 9ch;
  margin-bottom: 24px;
  font-size: clamp(3.9rem, 7vw, 5.6rem);
  line-height: .92;
}
.hero-copy {
  max-width: 540px;
  margin-bottom: 24px;
  color: var(--muted);
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  line-height: 1.7;
}
.actions { display: flex; flex-wrap: wrap; gap: 10px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--ink);
  border-radius: 6px;
  font-weight: 600;
  transition: transform var(--ease), opacity var(--ease), background-color var(--ease), color var(--ease);
}
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--ink); color: var(--paper); }
.button-secondary { border-color: var(--line); background: var(--surface); }
.button-secondary:hover { border-color: var(--line-strong); }

.hero-visual { display: grid; justify-items: center; gap: 18px; }
.portrait-frame {
  position: relative;
  display: grid;
  width: min(302px, 72vw);
  aspect-ratio: 1;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background:
    radial-gradient(circle at 25% 22%, rgba(57, 91, 80, .18), transparent 34%),
    radial-gradient(circle at 75% 74%, rgba(178, 137, 79, .2), transparent 38%),
    var(--surface);
}
.portrait-frame img { width: 100%; height: 100%; object-fit: cover; }
.portrait-fallback { display: none; color: var(--accent); font-size: 4rem; font-weight: 500; letter-spacing: -.08em; }
.portrait-frame.is-fallback img { display: none; }
.portrait-frame.is-fallback .portrait-fallback { display: block; }
.socials { display: flex; gap: 8px; }
.icon-link { width: 46px; height: 46px; }

.section { padding: 72px 0; border-top: 1px solid var(--line); }
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; }
h2 { margin-bottom: 0; font-size: clamp(2.8rem, 5vw, 4.1rem); line-height: .98; }
.section-copy { max-width: 520px; color: var(--muted); font-size: 1.05rem; line-height: 1.75; }
.section-copy p:last-child { margin-bottom: 0; }

.section-heading { margin-bottom: 28px; }
.work-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.work-card {
  display: grid;
  min-height: 100%;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color var(--ease), transform var(--ease), box-shadow var(--ease);
}
.work-card:hover { border-color: var(--line-strong); transform: translateY(-4px); box-shadow: var(--shadow); }
.work-art {
  display: grid;
  min-height: 190px;
  padding: 24px;
  place-items: center;
  background:
    radial-gradient(circle at 20% 25%, rgba(57, 91, 80, .25), transparent 34%),
    radial-gradient(circle at 78% 35%, rgba(151, 113, 72, .19), transparent 32%),
    var(--paper);
}
.work-card:nth-child(2) .work-art {
  background:
    radial-gradient(circle at 20% 20%, rgba(57, 91, 80, .34), transparent 36%),
    radial-gradient(circle at 80% 70%, rgba(214, 185, 93, .28), transparent 42%),
    var(--paper);
}
.work-card:nth-child(3) .work-art {
  background:
    radial-gradient(circle at 70% 20%, rgba(109, 89, 121, .23), transparent 34%),
    radial-gradient(circle at 25% 76%, rgba(57, 91, 80, .24), transparent 40%),
    var(--paper);
}
.work-art span { max-width: 90%; font-size: 1.35rem; font-weight: 700; letter-spacing: -.05em; line-height: .94; text-align: center; text-transform: uppercase; }
.work-body { display: flex; flex-direction: column; padding: 22px; }
.work-meta { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.work-type { color: var(--accent); font-size: .72rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
.work-arrow { color: var(--muted); font-size: 1.2rem; }
.work-body h3 { margin-bottom: 10px; font-size: 1rem; font-weight: 600; letter-spacing: -.02em; }
.work-body p { margin-bottom: 0; color: var(--muted); font-size: .95rem; line-height: 1.6; }

.proof-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.proof-card { padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.proof-number { display: block; margin-bottom: 14px; font-size: 2.25rem; letter-spacing: -.06em; }
.proof-label { margin: 0; color: var(--muted); font-size: .92rem; line-height: 1.5; }
.proof-card a { text-decoration: underline; text-decoration-color: var(--line-strong); text-underline-offset: 4px; }
.proof-card a:hover { text-decoration-color: var(--accent); }

.contact { display: flex; align-items: end; justify-content: space-between; gap: 32px; }
.contact-copy { max-width: 610px; }
.contact-copy p { max-width: 500px; margin: 20px 0 0; color: var(--muted); font-size: 1.05rem; line-height: 1.7; }
.contact-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; }
.contact-link { display: inline-flex; align-items: center; gap: 8px; padding: 11px 14px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); font-size: .92rem; transition: border-color var(--ease), transform var(--ease); }
.contact-link:hover { border-color: var(--line-strong); transform: translateY(-2px); }
.contact-link svg { width: 16px; height: 16px; }

.page-footer { display: flex; align-items: center; justify-content: space-between; gap: 18px; width: 100vw; margin-left: calc(50% - 50vw);padding: 28px max(50px, calc((100vw - var(--max)) / 2)); background: var(--footer); color: var(--footer-text); font-size: .92rem; }
.page-footer p { margin: 0;}
.page-footer strong { color: var(--footer-strong); font-weight: 600; }
.page-footer a { color: var(--footer-strong); }
.page-footer a:hover { text-decoration: underline; text-underline-offset: 4px; }
.footer-copyright { color: var(--footer-text); }


.visitor-card { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-top: 18px; padding: 18px 20px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.visitor-label { margin: 0 0 4px; color: var(--muted); font-size: .84rem; }
.visitor-note { margin: 0; color: var(--soft-muted); font-size: .78rem; }
.visitor-count { min-width: 84px; color: var(--ink); font-family: "Geist Mono", ui-monospace, monospace; font-size: 1.55rem; font-weight: 500; letter-spacing: -.06em; text-align: right; }
.visitor-count.is-loading { color: var(--soft-muted); font-size: 1rem; letter-spacing: 0; }

@media (max-width: 820px) {
  :root { --gutter: 28px; }
  .shell { width: min(calc(100% - 56px), var(--max)); }
  .hero { grid-template-columns: 1fr; min-height: auto; gap: 56px; padding: 60px 0 84px; }
  .hero-visual { justify-items: center; }
  .portrait-frame { width: min(300px, 70vw); }
  .split, .work-grid, .proof-grid, .security-layout { grid-template-columns: 1fr; gap: 18px; }
  .section { padding: 56px 0; }
  .contact { display: block; }
  .security-panel h3 { max-width: 14ch; }
  .contact-links { justify-content: flex-start; margin-top: 24px; }
  .page-footer { margin-inline: -28px; padding: 28px; }
}

@media (max-width: 620px) {
  .site-nav { min-height: 64px; padding: 18px 0; }
  .nav-right { gap: 8px; }
  .menu-toggle { display: inline-grid; }
  .nav-links { display: none; width: 100%; padding-top: 12px; }
  .site-nav.is-open { flex-wrap: wrap; }
  .site-nav.is-open .nav-right { flex-wrap: wrap; justify-content: flex-end; }
  .site-nav.is-open .nav-links { display: grid; gap: 0; width: 100%; order: 3; }
  .site-nav.is-open .nav-links a { padding: 12px 0; border-top: 1px solid var(--line); }
  h1 { max-width: 8ch; font-size: clamp(3.15rem, 15vw, 4.4rem); }
  h2 { font-size: 2.8rem; }
  .actions, .actions .button { width: 100%; }
  .page-footer { flex-direction: column; align-items: flex-start; }
  .visitor-card { align-items: flex-start; }
  .visitor-count { margin-left: auto; }
}

/* ---------- Project detail pages (e.g. hackathon/sih-ecoyield.html) ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  padding: 24px 0 20px;
}
.back-link { color: var(--muted); font-size: .95rem; transition: color var(--ease); }
.back-link:hover { color: var(--ink); }
.top-actions { display: flex; align-items: center; gap: 10px; }

.project-page h1 { max-width: 8ch; margin-bottom: 22px; font-size: clamp(4.2rem, 9vw, 7.2rem); line-height: .86; }
.project-page h2 { font-size: clamp(2.8rem, 5vw, 4.5rem); line-height: .94; }

.project-hero { padding: 72px 0 92px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.03fr) minmax(360px, .97fr); gap: 72px; align-items: center; }
.hero-dek { max-width: 560px; margin: 0 0 28px; color: var(--muted); font-size: clamp(1.05rem, 1.7vw, 1.25rem); line-height: 1.7; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.project-visual { margin: 0; }
.hero-image-wrap { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.hero-image-wrap img { width: 100%; aspect-ratio: 1.18 / 1; object-fit: cover; }
.image-fallback { display: grid; min-height: 360px; place-items: center; padding: 36px; background: radial-gradient(circle at 20% 25%, rgba(57, 91, 80, .25), transparent 34%), radial-gradient(circle at 78% 35%, rgba(151, 113, 72, .2), transparent 32%), var(--surface); color: var(--accent); font-size: clamp(2.6rem, 7vw, 5rem); font-weight: 500; letter-spacing: -.08em; }
.project-visual figcaption { display: flex; justify-content: space-between; gap: 18px; padding: 14px 16px; color: var(--muted); font-size: .82rem; }
.project-visual figcaption span:last-child { color: var(--soft-muted); text-align: right; }

.fact-strip { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.fact { padding: 20px 22px; border-right: 1px solid var(--line); }
.fact:last-child { border-right: 0; }
.fact-label { display: block; margin-bottom: 6px; color: var(--soft-muted); font-size: .72rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.fact strong { font-size: .96rem; font-weight: 500; }

.project-page .section { padding: 76px 0; border-top: 0; border-bottom: 1px solid var(--line); }
.project-page .section-heading { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: 56px; margin-bottom: 34px; }
.project-page .section-heading > p:last-child, .lead { max-width: 600px; margin: 0; color: var(--muted); font-size: 1.06rem; line-height: 1.75; }

.content-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.content-card { padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.content-card h3 { margin-bottom: 12px; font-size: 1.25rem; font-weight: 500; letter-spacing: -.035em; }
.content-card p { margin: 0; color: var(--muted); line-height: 1.7; }

.flow { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; counter-reset: flow; }
.flow-step { position: relative; padding: 24px 24px 24px 62px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.flow-step::before { counter-increment: flow; content: "0" counter(flow); position: absolute; top: 25px; left: 24px; color: var(--accent); font-family: "Geist Mono", ui-monospace, monospace; font-size: .8rem; font-weight: 700; }
.flow-step h3 { margin-bottom: 8px; font-size: 1rem; font-weight: 600; letter-spacing: -.02em; }
.flow-step p { margin: 0; color: var(--muted); font-size: .93rem; line-height: 1.6; }

.stack-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.stack-item { padding: 18px 16px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); }
.stack-item span { display: block; margin-bottom: 7px; color: var(--soft-muted); font-size: .72rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.stack-item strong { font-size: .92rem; font-weight: 500; line-height: 1.35; }

.impact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.impact { padding: 24px; border-top: 2px solid var(--accent); background: var(--surface); }
.impact h3 { margin-bottom: 10px; font-size: 1.12rem; font-weight: 500; }
.impact p { margin: 0; color: var(--muted); font-size: .94rem; line-height: 1.6; }

.reflection { display: grid; grid-template-columns: minmax(0, .7fr) minmax(0, 1.3fr); gap: 56px; align-items: start; padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.reflection h3 { margin-bottom: 0; font-size: 1.5rem; line-height: 1.05; }
.reflection p { margin: 0; color: var(--muted); line-height: 1.75; }

.team-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.team-member { padding: 9px 12px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); color: var(--muted); font-size: .9rem; }

@media (max-width: 860px) {
  .hero-grid, .project-page .section-heading, .reflection { grid-template-columns: 1fr; gap: 28px; }
  .project-visual { max-width: 620px; }
  .fact-strip { grid-template-columns: repeat(2, 1fr); }
  .fact:nth-child(2) { border-right: 0; }
  .fact:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .flow, .impact-grid { grid-template-columns: 1fr; gap: 14px; }
  .stack-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 620px) {
  .topbar { min-height: 64px; padding: 18px 0; }
  .project-hero { padding: 52px 0 66px; }
  .project-page h1 { font-size: clamp(3.65rem, 18vw, 5.3rem); }
  .hero-actions, .hero-actions .button { width: 100%; }
  .fact-strip { grid-template-columns: 1fr; }
  .fact { border-right: 0; border-bottom: 1px solid var(--line); }
  .fact:last-child { border-bottom: 0; }
  .stack-grid { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}