/* ==========================================================================
   STUDIO AMBANG — stylesheet
   Palette:  paper #F2F0EA · ink #17181A · moss #46583F · moss-deep #2C3628
             stone #E3E0D6 · line #CFCABC · rust-clay is deliberately avoided
   Type:     Fraunces (display) · Inter (body) · Space Mono (annotation/meta)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300;0,9..144,400;0,9..144,500;0,9..144,600;1,9..144,400&family=Inter:wght@400;500;600&family=Space+Mono:wght@400;700&display=swap');

:root {
  --paper: #F2F0EA;
  --paper-dim: #EAE7DE;
  --ink: #17181A;
  --ink-soft: #4A4A46;
  --moss: #46583F;
  --moss-deep: #2C3628;
  --moss-tint: #DCE3D6;
  --stone: #E3E0D6;
  --line: #CFCABC;
  --line-strong: #B8B2A2;

  --display: 'Fraunces', Georgia, serif;
  --body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'Space Mono', 'Courier New', monospace;

  --max: 1280px;
  --edge: clamp(20px, 5vw, 64px);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

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

::selection { background: var(--moss); color: var(--paper); }

:focus-visible {
  outline: 2px solid var(--moss);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

h1, h2, h3 { font-family: var(--display); font-weight: 500; margin: 0; letter-spacing: -0.01em; }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--moss);
}

/* ---------------------------------- Nav ---------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px var(--edge);
  background: rgba(242, 240, 234, 0.88);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

.brand {
  font-family: var(--display);
  font-size: 1.15rem;
  letter-spacing: 0.01em;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.brand-mark {
  width: 9px;
  height: 9px;
  background: var(--moss);
  display: inline-block;
  border-radius: 1px;
  transform: rotate(45deg);
  position: relative;
  top: -2px;
}

.main-nav {
  display: flex;
  gap: clamp(18px, 3vw, 36px);
  font-size: 0.88rem;
}

.main-nav a {
  position: relative;
  padding: 4px 0;
  color: var(--ink-soft);
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--ink);
}

.main-nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -3px;
  height: 1px;
  background: var(--moss);
}

.nav-toggle { display: none; }
.nav-close { display: none; }

/* ------------------------------ Annotation line --------------------------
   Signature device: a thin ruled line with tick marks + monospace caption,
   echoing the way elevation drawings annotate coordinates and materials. */

.annotation {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px var(--edge);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  overflow-x: auto;
  white-space: nowrap;
}

.annotation .tick {
  width: 1px;
  height: 10px;
  background: var(--line-strong);
  flex-shrink: 0;
}

.annotation span.sep { color: var(--line-strong); }

/* --------------------------------- Hero ----------------------------------- */

.hero {
  position: relative;
  height: min(88vh, 820px);
  min-height: 520px;
  overflow: hidden;
  background: var(--ink);
}

.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1.1s ease;
}

.hero-slide.is-active { opacity: 1; }

.hero-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.82) saturate(0.96);
}

.hero-veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(23,24,26,0.15) 0%, rgba(23,24,26,0.05) 35%, rgba(23,24,26,0.55) 100%);
}

.hero-content {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 0 var(--edge) clamp(28px, 5vw, 56px);
  color: var(--paper);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.hero-eyebrow {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--moss-tint);
}

.hero-title {
  font-size: clamp(2.1rem, 6vw, 4.4rem);
  line-height: 1.02;
  max-width: 14ch;
}

.hero-sub {
  max-width: 46ch;
  font-size: clamp(0.95rem, 1.4vw, 1.08rem);
  color: rgba(242,240,234,0.86);
}

.hero-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.hero-dots {
  display: flex;
  gap: 8px;
}

.hero-dots button {
  width: 26px;
  height: 3px;
  border: none;
  background: rgba(242,240,234,0.35);
  cursor: pointer;
  padding: 0;
  transition: background 0.3s ease;
}

.hero-dots button.is-active { background: var(--paper); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 13px 22px;
  border: 1px solid currentColor;
  transition: background 0.25s ease, color 0.25s ease;
}

.btn-light { color: var(--paper); }
.btn-light:hover { background: var(--paper); color: var(--ink); }

.btn-dark { color: var(--ink); }
.btn-dark:hover { background: var(--ink); color: var(--paper); }

.btn-arrow { transition: transform 0.25s ease; }
.btn:hover .btn-arrow { transform: translateX(3px); }

/* ------------------------------ Section shell ----------------------------- */

.section {
  padding: clamp(56px, 9vw, 108px) var(--edge);
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: clamp(32px, 5vw, 56px);
  flex-wrap: wrap;
}

.section-title {
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  margin-top: 10px;
}

/* --------------------------- Featured project ----------------------------- */

.featured {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(24px, 4vw, 56px);
  align-items: center;
}

.featured-media { position: relative; }

.featured-media img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.featured-tag {
  position: absolute;
  top: 16px; left: 16px;
  background: var(--paper);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 6px 10px;
}

.featured-body h3 {
  font-size: clamp(1.7rem, 3vw, 2.6rem);
  margin-bottom: 18px;
}

.featured-body p { color: var(--ink-soft); margin-bottom: 26px; max-width: 48ch; }

.spec-list {
  list-style: none;
  padding: 0;
  margin: 0 0 30px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 20px;
  border-top: 1px solid var(--line);
  padding-top: 20px;
}

.spec-list dt {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.spec-list dd { margin: 4px 0 0; font-size: 0.94rem; }

/* ------------------------------- Card grid -------------------------------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(20px, 3vw, 36px);
}

.proj-card { display: flex; flex-direction: column; }

.proj-card-media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 5 / 4;
  background: var(--stone);
}

.proj-card-media img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.7s cubic-bezier(.2,.7,.3,1), filter 0.5s ease;
}

.proj-card:hover .proj-card-media img { transform: scale(1.045); }

.proj-card-num {
  position: absolute;
  top: 12px; right: 12px;
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--paper);
  background: rgba(23,24,26,0.55);
  padding: 4px 8px;
}

.proj-card-body { padding-top: 16px; }

.proj-card-loc {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--moss);
  margin-bottom: 6px;
  display: block;
}

.proj-card-title {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.proj-more {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 3px;
  width: fit-content;
}

.proj-card:hover .proj-more { border-color: var(--moss); color: var(--moss); }

/* ------------------------------- Footer ------------------------------- */

.site-footer {
  border-top: 1px solid var(--line);
  padding: clamp(40px, 6vw, 64px) var(--edge) 32px;
  background: var(--paper-dim);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 40px;
}

.footer-brand .brand { margin-bottom: 14px; }
.footer-brand p { color: var(--ink-soft); max-width: 36ch; font-size: 0.92rem; }

.footer-col h4 {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

.footer-col a, .footer-col p {
  display: block;
  font-size: 0.92rem;
  margin-bottom: 9px;
  color: var(--ink);
}

.footer-col a:hover { color: var(--moss); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-soft);
  flex-wrap: wrap;
  gap: 10px;
}

/* -------------------------- Portfolio page -------------------------- */

.page-hero {
  padding: clamp(96px, 12vw, 144px) var(--edge) clamp(40px, 6vw, 64px);
  border-bottom: 1px solid var(--line);
}

.page-hero .eyebrow { margin-bottom: 18px; }

.page-hero h1 {
  font-size: clamp(2.2rem, 5.5vw, 3.6rem);
  max-width: 16ch;
}

.page-hero p {
  margin-top: 20px;
  max-width: 52ch;
  color: var(--ink-soft);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(28px, 3vw, 40px) clamp(20px, 3vw, 32px);
  padding: clamp(48px, 6vw, 72px) var(--edge);
}

.portfolio-item { position: relative; }

.portfolio-item .proj-card-media { aspect-ratio: 4 / 5; }

/* ------------------------- Detail overlay (CSS :target) ------------------------- */

.detail {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--paper);
  overflow-y: auto;
  transform: translateY(100%);
  opacity: 0;
  visibility: hidden;
  transition: transform 0.5s cubic-bezier(.2,.7,.3,1), opacity 0.4s ease, visibility 0s linear 0.5s;
}

.detail:target {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
  transition: transform 0.5s cubic-bezier(.2,.7,.3,1), opacity 0.4s ease, visibility 0s;
}

.detail-close {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px var(--edge);
  background: rgba(242,240,234,0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.detail-close a { display: inline-flex; align-items: center; gap: 8px; }
.detail-close a:hover { color: var(--moss); }

.detail-hero {
  width: 100%;
  aspect-ratio: 16 / 8;
  object-fit: cover;
}

.detail-body {
  max-width: 920px;
  margin: 0 auto;
  padding: clamp(40px, 6vw, 64px) var(--edge) 100px;
}

.detail-title {
  font-size: clamp(1.9rem, 4vw, 3rem);
  margin: 18px 0 26px;
}

.detail-specs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 36px;
}

.detail-specs dt {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.detail-specs dd { margin: 6px 0 0; font-size: 0.95rem; }

.detail-body p { color: var(--ink-soft); max-width: 68ch; margin-bottom: 20px; }

.detail-gallery {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 36px;
}

.detail-gallery img { aspect-ratio: 4/3; object-fit: cover; }

/* -------------------------------- About page -------------------------------- */

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: start;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin: clamp(40px, 6vw, 64px) 0;
}

.stat {
  padding: 28px var(--edge);
  border-right: 1px solid var(--line);
}
.stat:last-child { border-right: none; }

.stat b {
  display: block;
  font-family: var(--display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 500;
  color: var(--moss-deep);
}

.stat span {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.principle {
  border-top: 1px solid var(--line-strong);
  padding-top: 18px;
}

.principle .eyebrow { margin-bottom: 12px; }
.principle h3 { font-size: 1.25rem; margin-bottom: 10px; }
.principle p { color: var(--ink-soft); font-size: 0.94rem; }

.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.team-card { border-top: 1px solid var(--line); padding-top: 16px; }
.team-card .name { font-family: var(--display); font-size: 1.15rem; margin-bottom: 4px; }
.team-card .role {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--moss);
}

.about-portrait {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
}

.contact-block {
  background: var(--moss-deep);
  color: var(--paper);
  padding: clamp(40px, 6vw, 64px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}

.contact-block h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); max-width: 18ch; }
.contact-block .btn-light:hover { background: var(--paper); color: var(--moss-deep); }

/* ---------------------------------- Responsive ---------------------------------- */

@media (max-width: 900px) {
  .page-hero {
    padding-top: 72px;
  }

  .featured { grid-template-columns: 1fr; }
  .card-grid, .portfolio-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 28px; }
  .split { grid-template-columns: 1fr; }
  .principles, .team-grid { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: 1fr; }
  .stat { border-right: none; border-bottom: 1px solid var(--line); }
  .stat:last-child { border-bottom: none; }
  .detail-specs { grid-template-columns: 1fr 1fr; }
  .detail-gallery { grid-template-columns: 1fr; }

  .main-nav {
    position: fixed;
    top: 0; right: 0; bottom: 0;
    width: min(82vw, 340px);
    background: #ffffff;
    color: var(--ink);
    flex-direction: column;
    padding: 16px 18px 18px;
    gap: 6px;
    font-size: 1rem;
    transform: translateX(100%);
    transition: transform 0.4s ease;
    border-left: 1px solid var(--line);
    box-shadow: -24px 0 48px rgba(23, 24, 26, 0.14);
    background-clip: padding-box;
  }

  .site-header.is-nav-open::before {
    content: "";
    position: fixed;
    inset: 0;
    background: rgba(23, 24, 26, 0.22);
    z-index: 49;
  }

  .site-header.is-nav-open .main-nav {
    transform: translateX(0);
    z-index: 51;
  }

  .nav-close {
    display: grid;
    align-self: flex-end;
    width: 36px;
    height: 36px;
    border: 1px solid rgba(23, 24, 26, 0.12);
    border-radius: 999px;
    background: #ffffff;
    color: var(--ink);
    display: grid;
    place-items: center;
    padding: 0;
    cursor: pointer;
    font-size: 1.35rem;
    line-height: 1;
    transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
  }

  .nav-close:hover {
    background: var(--ink);
    border-color: var(--ink);
    color: var(--paper);
    transform: scale(1.04);
  }

  .main-nav a {
    display: block;
    width: 100%;
    color: var(--ink);
    font-weight: 500;
    padding: 14px 12px;
    border: 1px solid rgba(23, 24, 26, 0.08);
    border-radius: 10px;
    box-shadow: none;
    background: #ffffff;
  }

  .main-nav a:last-child {
    border-bottom: none;
  }

  .main-nav a:hover,
  .main-nav a[aria-current="page"] {
    color: var(--moss-deep);
  }

  .nav-toggle {
    display: block;
    background: transparent;
    border: none;
    cursor: pointer;
    width: 28px;
    height: 20px;
    position: relative;
  }
  .nav-toggle span, .nav-toggle::before, .nav-toggle::after {
    content: "";
    position: absolute;
    left: 0; right: 0;
    height: 1px;
    background: var(--ink);
  }
  .nav-toggle::before { top: 0; }
  .nav-toggle span { top: 9px; }
  .nav-toggle::after { top: 18px; }
}