/* ==========================================================================
   KARVIN FERNANDO — personal site
   Monochrome / technical / spec-sheet design system
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=Inter:wght@400;500;600&display=swap');

:root {
  --bg: #0a0a0a;
  --bg-alt: #121212;
  --bg-card: #141414;
  --fg: #f4f4f2;
  --fg-dim: #9b9b96;
  --fg-faint: #6b6b67;
  --border: #2a2a28;
  --border-strong: #464642;
  --max: 1240px;
  --gutter: clamp(20px, 5vw, 64px);
  --display: 'Space Grotesk', 'Arial Narrow', sans-serif;
  --body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

h1, h2, h3, h4 {
  font-family: var(--display);
  text-transform: uppercase;
  letter-spacing: 0.01em;
  font-weight: 600;
  margin: 0;
}

p { color: var(--fg-dim); margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--display);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 18px;
}
.eyebrow::before {
  content: '';
  width: 22px;
  height: 1px;
  background: var(--border-strong);
}

/* ---------------------------------- nav ---------------------------------- */

.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(10,10,10,0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.nav-logo {
  font-family: var(--display);
  font-size: 15px;
  letter-spacing: 0.06em;
  font-weight: 600;
}
.nav-logo span { color: var(--fg-faint); }
.nav-links {
  display: flex;
  gap: 34px;
  list-style: none;
  margin: 0; padding: 0;
}
.nav-links a {
  font-family: var(--display);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-dim);
  padding-bottom: 4px;
  border-bottom: 1px solid transparent;
  transition: color .2s, border-color .2s;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--fg);
  border-color: var(--fg);
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 22px; height: 1px; background: var(--fg);
}

@media (max-width: 820px) {
  .nav-links {
    position: fixed;
    top: 76px; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height .25s ease;
  }
  .nav-links.open { max-height: 400px; }
  .nav-links li { border-top: 1px solid var(--border); }
  .nav-links a { display: block; padding: 18px var(--gutter); border-bottom: none; }
  .nav-toggle { display: flex; }
}

/* --------------------------------- hero ---------------------------------- */

.hero {
  min-height: 92vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 140px;
  padding-bottom: 80px;
  border-bottom: 1px solid var(--border);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.03), transparent 40%),
    repeating-linear-gradient(0deg, rgba(255,255,255,0.02) 0px, rgba(255,255,255,0.02) 1px, transparent 1px, transparent 64px);
}
.hero h1 {
  font-size: clamp(38px, 6.4vw, 92px);
  line-height: 1.02;
  max-width: 15ch;
}
.hero h1 em {
  font-style: normal;
  color: var(--fg-faint);
}
.hero .lede {
  margin-top: 26px;
  max-width: 52ch;
  font-size: clamp(16px, 1.6vw, 19px);
  color: var(--fg-dim);
}
.hero-actions {
  margin-top: 40px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* --------------------------------- buttons -------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--display);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 15px 26px;
  border: 1px solid var(--border-strong);
  transition: background .2s, color .2s, border-color .2s;
}
.btn-solid {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}
.btn-solid:hover { background: transparent; color: var(--fg); }
.btn-ghost:hover { border-color: var(--fg); }

/* --------------------------------- sections -------------------------------- */

.section {
  padding: 96px 0;
  border-bottom: 1px solid var(--border);
}
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: 56px;
  flex-wrap: wrap;
}
.section-head h2 {
  font-size: clamp(26px, 3.4vw, 44px);
  max-width: 20ch;
}
.section-head .section-note {
  max-width: 34ch;
  color: var(--fg-dim);
  font-size: 15px;
}

/* --------------------------------- grids ---------------------------------- */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
}

.card {
  background: var(--bg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.card .index {
  font-family: var(--display);
  font-size: 12px;
  color: var(--fg-faint);
  letter-spacing: 0.1em;
}
.card h3 {
  font-size: 19px;
  letter-spacing: 0.02em;
}
.card p { font-size: 14.5px; }
.card-link {
  margin-top: auto;
  font-family: var(--display);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg);
  padding-top: 10px;
}
.card.link-card { transition: background .2s; }
.card.link-card:hover { background: var(--bg-card); }

/* --------------------------------- stats ---------------------------------- */

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--border);
}
.stat {
  padding: 34px 28px;
  border-left: 1px solid var(--border);
}
.stat:first-child { border-left: none; }
.stat .num {
  font-family: var(--display);
  font-size: clamp(26px, 3vw, 40px);
  font-weight: 600;
}
.stat .label {
  margin-top: 8px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--fg-dim);
}
@media (max-width: 820px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: none; }
}
@media (max-width: 520px) {
  .stats { grid-template-columns: 1fr; }
  .stat { border-left: none !important; border-top: 1px solid var(--border); }
  .stat:first-child { border-top: none; }
}

/* ------------------------------ placeholder media -------------------------- */

.media-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  border: 1px dashed var(--border-strong);
  background: var(--bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.media-frame.tall { aspect-ratio: 4 / 5; }
.media-frame .ph-label {
  font-family: var(--display);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-faint);
  text-align: center;
  padding: 0 20px;
}
.play-btn {
  position: absolute;
  width: 64px; height: 64px;
  border-radius: 50%;
  border: 1px solid var(--fg-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--fg);
  cursor: pointer;
  background: rgba(0,0,0,0.3);
}
.play-btn::after {
  content: '';
  border-style: solid;
  border-width: 8px 0 8px 13px;
  border-color: transparent transparent transparent var(--fg);
  margin-left: 4px;
}

/* --------------------------------- carousel -------------------------------- */

.carousel {
  position: relative;
  border: 1px solid var(--border);
}
.carousel-track {
  position: relative;
  aspect-ratio: 21 / 9;
  overflow: hidden;
}
.carousel-slide {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-alt);
  opacity: 0;
  transition: opacity .5s ease;
  pointer-events: none;
}
.carousel-slide.active { opacity: 1; pointer-events: auto; }
.carousel-slide img { width: 100%; height: 100%; object-fit: cover; }
.carousel-caption {
  position: absolute;
  left: 0; bottom: 0; right: 0;
  padding: 18px var(--gutter);
  background: linear-gradient(0deg, rgba(0,0,0,0.65), transparent);
  font-family: var(--display);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-dim);
}
.carousel-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border);
  padding: 14px var(--gutter);
}
.carousel-arrows { display: flex; gap: 10px; }
.carousel-arrows button {
  width: 38px; height: 38px;
  background: none;
  border: 1px solid var(--border-strong);
  color: var(--fg);
  cursor: pointer;
  font-family: var(--display);
}
.carousel-arrows button:hover { background: var(--fg); color: var(--bg); }
.carousel-dots { display: flex; gap: 8px; }
.carousel-dots button {
  width: 8px; height: 8px;
  border-radius: 50%;
  border: 1px solid var(--fg-faint);
  background: transparent;
  cursor: pointer;
  padding: 0;
}
.carousel-dots button.active { background: var(--fg); border-color: var(--fg); }

/* --------------------------------- steps (3-part breakdown) ---------------- */

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.step { background: var(--bg); padding: 44px 34px; }
.step .step-num {
  font-family: var(--display);
  font-size: 34px;
  color: var(--fg-faint);
  margin-bottom: 18px;
}
.step h3 { font-size: 18px; margin-bottom: 14px; }
.step p { font-size: 14.5px; }
@media (max-width: 900px) { .steps { grid-template-columns: 1fr; } }

/* --------------------------------- pillars ---------------------------------- */

.pillar-num { color: var(--fg-faint); font-family: var(--display); font-size: 13px; }

/* --------------------------------- footer ---------------------------------- */

.site-footer {
  padding: 56px 0 40px;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  flex-wrap: wrap;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--border);
}
.footer-logo {
  font-family: var(--display);
  font-size: 18px;
  letter-spacing: 0.04em;
  max-width: 24ch;
}
.footer-cols { display: flex; gap: 64px; flex-wrap: wrap; }
.footer-col h4 {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--fg-faint);
  margin-bottom: 16px;
}
.footer-col ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-col a { color: var(--fg-dim); font-size: 14px; }
.footer-col a:hover { color: var(--fg); }
.footer-bottom {
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  font-size: 12.5px;
  color: var(--fg-faint);
  flex-wrap: wrap;
  gap: 10px;
}

/* --------------------------------- misc page hero (non-home) ---------------- */

.page-hero {
  padding: 160px 0 70px;
  border-bottom: 1px solid var(--border);
}
.page-hero h1 {
  font-size: clamp(32px, 5vw, 60px);
  max-width: 18ch;
}
.page-hero .lede {
  margin-top: 22px;
  max-width: 60ch;
  font-size: 16.5px;
}

.prose { max-width: 68ch; }
.prose p { font-size: 16px; color: var(--fg-dim); }

.tag-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.tag {
  font-family: var(--display);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--border-strong);
  padding: 7px 12px;
  color: var(--fg-dim);
}

.two-col {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 64px;
  align-items: center;
}
@media (max-width: 900px) {
  .two-col { grid-template-columns: 1fr; }
}

form.contact-form {
  display: flex;
  flex-direction: column;
  gap: 22px;
  max-width: 640px;
}
.form-row { display: flex; flex-direction: column; gap: 8px; }
.form-row label {
  font-family: var(--display);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-faint);
}
.form-row input,
.form-row select,
.form-row textarea {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--fg);
  font-family: var(--body);
  font-size: 15px;
  padding: 14px 16px;
}
.form-row textarea { resize: vertical; min-height: 120px; }
.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--fg-dim);
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 26px;
}
.contact-methods .item { border-top: 1px solid var(--border); padding-top: 18px; }
.contact-methods h4 {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--fg-faint);
  margin-bottom: 8px;
}
.contact-methods p { font-size: 15px; color: var(--fg); }