/* ===========================================================
   Chaularaj Devkota — Civil Engineer & Project Manager
   Theme: "Drawing Register" — blueprint / site-index aesthetic
   =========================================================== */

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

:root {
  --black: #121110;
  --black-soft: #1b1917;
  --maroon: #7c2530;
  --maroon-dark: #4f151d;
  --yellow: #f2b705;
  --cream: #ede6d8;
  --gray: #9a9188;
  --line: #3a3733;

  --font-display: 'Oswald', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --max: 1100px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--black);
  color: var(--cream);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--yellow);
}

/* ---------- Corner registration mark (blueprint motif) ---------- */
.reg-mark {
  position: relative;
}
.reg-mark::before,
.reg-mark::after {
  content: '';
  position: absolute;
  background: var(--yellow);
}

/* ---------- Header ---------- */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(18, 17, 16, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo span.dot { color: var(--yellow); }

nav.main-nav ul {
  list-style: none;
  display: flex;
  gap: 32px;
}
nav.main-nav a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cream);
  position: relative;
  padding-bottom: 4px;
}
nav.main-nav a::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  background: var(--yellow);
  transition: width 0.25s ease;
}
nav.main-nav a:hover::after { width: 100%; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 24px; height: 2px;
  background: var(--yellow);
}

/* ---------- Hero ---------- */
.hero {
  padding: 88px 0 64px;
  position: relative;
  overflow: hidden;
}

.hero .location {
  margin-bottom: 18px;
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.6rem, 7vw, 5.2rem);
  line-height: 1.02;
  letter-spacing: -0.01em;
  text-transform: uppercase;
}
.hero h1 .accent { color: var(--yellow); }

.hero .role {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--gray);
  margin-top: 14px;
  letter-spacing: 0.02em;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  gap: 56px;
  align-items: start;
  margin-top: 44px;
}

.hero-photo {
  border: 1px solid var(--line);
  aspect-ratio: 3/4;
  overflow: hidden;
  position: relative;
}
.hero-photo img {
  width: 100%; height: 100%; object-fit: cover;
  filter: grayscale(35%) contrast(1.05);
}
.hero-photo .tag {
  position: absolute;
  bottom: 0; left: 0;
  background: var(--maroon);
  color: var(--cream);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  padding: 6px 12px;
  text-transform: uppercase;
}

.hero-body p {
  color: var(--cream);
  font-size: 1.02rem;
  max-width: 56ch;
}

.hazard-strip {
  height: 10px;
  margin: 56px 0;
  background: repeating-linear-gradient(
    -45deg,
    var(--yellow),
    var(--yellow) 18px,
    var(--black) 18px,
    var(--black) 36px
  );
}

/* ---------- Section shell ---------- */
section { padding: 24px 0 72px; }

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  padding-bottom: 16px;
  margin-bottom: 8px;
}
.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.4vw, 2.3rem);
  text-transform: uppercase;
  letter-spacing: 0.01em;
  margin-top: 6px;
}

/* ---------- Drawing register (project index table) ---------- */
.register {
  width: 100%;
  border-collapse: collapse;
}
.register thead th {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray);
  text-align: left;
  padding: 14px 12px;
  border-bottom: 1px solid var(--line);
}
.register tbody tr {
  border-bottom: 1px solid var(--line);
  transition: background 0.2s ease;
}
.register tbody tr:hover { background: var(--black-soft); }

.register td {
  padding: 22px 12px;
  vertical-align: middle;
}
.register .sheet-no {
  font-family: var(--font-mono);
  color: var(--yellow);
  font-size: 1rem;
  width: 70px;
}
.register .proj-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  text-transform: uppercase;
  letter-spacing: 0.01em;
}
.register .proj-loc {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--gray);
}
.register .view-link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--cream);
  white-space: nowrap;
  border: 1px solid var(--line);
  padding: 8px 14px;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}
.register tbody tr:hover .view-link {
  border-color: var(--yellow);
  color: var(--black);
  background: var(--yellow);
}

@media (max-width: 640px) {
  .register .proj-loc { display: none; }
  .register td { padding: 16px 8px; }
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 28px;
}
.contact-card {
  border: 1px solid var(--line);
  padding: 22px;
}
.contact-card .label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--yellow);
  margin-bottom: 10px;
}
.contact-card .value {
  font-family: var(--font-display);
  font-size: 1.15rem;
}

@media (max-width: 720px) {
  .contact-grid { grid-template-columns: 1fr; }
}

/* ---------- Project subpage ---------- */
.project-hero {
  padding-top: 40px;
}
.project-meta {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  margin-top: 24px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.project-meta .item .label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray);
  margin-bottom: 6px;
}
.project-meta .item .value {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
}

.project-desc {
  max-width: 68ch;
  margin-top: 28px;
  color: var(--cream);
  font-size: 1.02rem;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 20px;
}
.gallery figure {
  border: 1px solid var(--line);
  aspect-ratio: 4/3;
  overflow: hidden;
  cursor: zoom-in;
  background: var(--black-soft);
}
.gallery img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.35s ease, filter 0.35s ease;
  filter: grayscale(20%);
}
.gallery figure:hover img {
  transform: scale(1.06);
  filter: grayscale(0%);
}

@media (max-width: 780px) {
  .gallery { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .gallery { grid-template-columns: 1fr 1fr; gap: 8px; }
}

.back-link {
  display: inline-block;
  margin-top: 48px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--yellow);
  color: var(--yellow);
  padding-bottom: 2px;
}

/* ---------- Lightbox ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(10, 9, 8, 0.94);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 40px;
}
.lightbox.open { display: flex; }
.lightbox img {
  max-width: 100%;
  max-height: 88vh;
  border: 1px solid var(--line);
}
.lightbox .close {
  position: absolute;
  top: 24px; right: 32px;
  font-family: var(--font-mono);
  color: var(--yellow);
  font-size: 1rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  background: none;
  border: none;
}

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gray);
  text-align: center;
}

/* ---------- Responsive nav / hero ---------- */
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-photo { max-width: 340px; }
}

@media (max-width: 720px) {
  nav.main-nav {
    position: fixed;
    top: 76px; left: 0; right: 0;
    background: var(--black);
    border-bottom: 1px solid var(--line);
    transform: translateY(-120%);
    transition: transform 0.25s ease;
  }
  nav.main-nav.open { transform: translateY(0); }
  nav.main-nav ul {
    flex-direction: column;
    padding: 20px 28px;
    gap: 20px;
  }
  .nav-toggle { display: flex; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

/* ---------- Reveal-on-scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.reveal.in { opacity: 1; transform: translateY(0); }