/* Balter Building — shared stylesheet */

:root {
  --ink: #0d0d0d;
  --ink-soft: #2a2a2a;
  --paper: #ffffff;
  --paper-soft: #f5f4f2;
  --line: #e4e2de;
  --muted: #6b6b68;
  --font-display: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Inter", "Helvetica Neue", Arial, sans-serif;
  --container: 1160px;
}

* { box-sizing: border-box; }

svg polygon { fill: currentColor; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0 0 0.5em;
}

p { margin: 0 0 1em; color: var(--ink-soft); }
a { color: inherit; text-decoration: none; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  display: block;
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.75em;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--ink);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--ink-soft); }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); }
.btn-ghost.on-dark { border-color: rgba(255,255,255,0.6); color: #fff; }
.btn-ghost.on-dark:hover { background: #fff; color: var(--ink); }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.3s ease, height 0.3s ease;
}
.site-header.is-scrolled { box-shadow: 0 8px 24px rgba(0,0,0,0.06); }
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
}
.brand { display: flex; align-items: center; gap: 12px; position: relative; z-index: 2; }
.brand svg { width: 26px; height: 41px; color: var(--ink); }
.brand-mark { width: 26px; height: 40px; object-fit: contain; transition: transform 0.5s cubic-bezier(.2,.8,.2,1); }
.brand:hover .brand-mark { transform: rotate(-8deg) scale(1.08); }
.brand-word { font-family: var(--font-display); font-weight: 700; letter-spacing: 0.06em; font-size: 1.15rem; }
.brand-word small { display: block; font-size: 0.55rem; letter-spacing: 0.32em; font-weight: 500; color: var(--muted); }

.main-nav { display: flex; align-items: center; gap: 36px; }
.main-nav a {
  position: relative;
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding-bottom: 4px;
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%; bottom: 0;
  height: 2px;
  background: var(--ink);
  transition: right 0.3s cubic-bezier(.2,.8,.2,1);
}
.main-nav a:hover::after, .main-nav a.active::after { right: 0; }
.main-nav a:hover, .main-nav a.active { color: var(--ink); }
.nav-cta { display: flex; align-items: center; }

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  position: relative;
  z-index: 60;
  width: 40px; height: 40px;
  border: none;
  background: none;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--ink);
  transition: transform 0.35s cubic-bezier(.2,.8,.2,1), opacity 0.25s ease;
}
.nav-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-nav-panel { display: none; }

/* Hero */
.hero {
  position: relative;
  min-height: 78vh;
  display: flex;
  align-items: flex-end;
  color: #fff;
  background: linear-gradient(160deg, #17181a 0%, #0a0a0b 55%, #1c1d1f 100%);
  overflow: hidden;
  padding: 96px 0 72px;
}
.hero-media {
  position: absolute;
  inset: -8%;
  background-size: cover;
  background-position: center;
  will-change: transform;
}
.hero.has-photo::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,10,11,0.35) 0%, rgba(10,10,11,0.75) 100%);
}
.hero:not(.has-photo)::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(115deg, rgba(255,255,255,0.045) 0 2px, transparent 2px 64px);
  opacity: 0.9;
}
.hero-skyline {
  position: absolute;
  right: -5%;
  bottom: -10%;
  width: 60%;
  max-width: 620px;
  opacity: 0.16;
  color: #fff;
}
.hero .container { position: relative; z-index: 1; }
.hero h1 { font-size: clamp(2.1rem, 4.4vw, 3.4rem); max-width: 16ch; }
.hero p.lede { color: rgba(255,255,255,0.78); max-width: 46ch; font-size: 1.05rem; }
.hero-actions { display: flex; gap: 16px; margin-top: 28px; flex-wrap: wrap; }

.hero.small { min-height: 46vh; padding: 76px 0 56px; }

/* Sections */
section { padding: 96px 0; }
section.tight { padding: 64px 0; }
.bg-soft { background: var(--paper-soft); }
.split {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 64px;
  align-items: start;
}
.split h2 { font-size: clamp(1.7rem, 3vw, 2.4rem); }

.divider { height: 1px; background: var(--line); border: 0; margin: 0; }

/* Cards */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin-top: 40px; }
.card-grid.cols-5 { grid-template-columns: repeat(5, 1fr); }
.project-card {
  border: 1px solid var(--line);
  overflow: hidden;
  transition: transform 0.45s cubic-bezier(.2,.8,.2,1), box-shadow 0.45s cubic-bezier(.2,.8,.2,1);
}
.project-card:hover { transform: translateY(-6px); box-shadow: 0 24px 44px rgba(0,0,0,0.1); }
.project-media {
  aspect-ratio: 4/3;
  background: linear-gradient(150deg, #2b2c2f, #0c0c0d 70%);
  background-size: cover;
  background-position: center;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: background-size 0.6s cubic-bezier(.2,.8,.2,1);
}
.project-card:hover .project-media,
.project-media:hover { background-size: 112%; }
.project-media svg { width: 34%; opacity: 0.35; color: #fff; }
.icon-card .icon-photo {
  width: 100%;
  aspect-ratio: 4/3;
  background-size: cover;
  background-position: center;
  margin-bottom: 16px;
  overflow: hidden;
  transition: background-size 0.6s cubic-bezier(.2,.8,.2,1);
}
.icon-card:hover .icon-photo { background-size: 112%; }
.project-body { padding: 18px 20px 22px; }
.project-body .year { font-size: 0.75rem; letter-spacing: 0.08em; color: var(--muted); text-transform: uppercase; }
.project-body h3 { font-size: 1.15rem; margin: 4px 0 6px; }
.project-body .status { font-size: 0.85rem; color: var(--muted); }

.icon-card { text-align: left; }
.icon-card .icon-tile {
  width: 56px; height: 56px;
  border: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
  background: var(--paper-soft);
}
.icon-card h3 { font-size: 1.02rem; margin-bottom: 6px; }
.icon-card p { font-size: 0.92rem; }

.stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; margin-top: 40px; }
.stat-grid .stat-num { font-family: var(--font-display); font-size: 2.6rem; font-weight: 700; }
.stat-grid p { font-size: 0.92rem; }

/* Process steps */
.step-list { counter-reset: step; margin-top: 40px; display: grid; gap: 28px; }
.step {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 20px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}
.step:last-child { border-bottom: 1px solid var(--line); }
.step-num { font-family: var(--font-display); font-size: 1.6rem; color: var(--muted); }
.step h3 { font-size: 1.05rem; margin-bottom: 6px; }
.step p { font-size: 0.92rem; margin: 0; }

/* CTA band */
.cta-band {
  background: var(--ink);
  color: #fff;
  padding: 88px 0;
}
.cta-band h2 { color: #fff; font-size: clamp(1.6rem, 3vw, 2.2rem); }
.cta-band p { color: rgba(255,255,255,0.72); }
.cta-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }

/* Forms */
.form-field { margin-bottom: 16px; }
.form-field label { display: block; font-size: 0.78rem; letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 6px; color: rgba(255,255,255,0.7); }
.on-light .form-field label { color: var(--muted); }
.form-field input, .form-field textarea {
  width: 100%;
  padding: 13px 14px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  border: 1px solid rgba(255,255,255,0.3);
  background: rgba(255,255,255,0.06);
  color: #fff;
}
.on-light .form-field input, .on-light .form-field textarea {
  border-color: var(--line);
  background: var(--paper);
  color: var(--ink);
}
.form-field textarea { min-height: 120px; resize: vertical; }
.form-note {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.55);
  margin-top: 10px;
}
.on-light .form-note { color: var(--muted); }

/* Contact detail columns */
.detail-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; margin: 40px 0 56px; }
.detail-cols h4 { font-size: 0.85rem; letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 10px; }
.detail-cols p { font-size: 0.95rem; margin: 0 0 4px; }

/* Notice banner */
.notice {
  border: 1px solid var(--line);
  background: var(--paper-soft);
  padding: 14px 18px;
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 18px;
}

/* Legal placeholder page */
.legal-placeholder {
  border: 1px dashed var(--line);
  padding: 48px;
  text-align: center;
  margin-top: 32px;
}
.legal-placeholder p { max-width: 52ch; margin-left: auto; margin-right: auto; }

/* Footer */
.site-footer { background: var(--paper-soft); border-top: 1px solid var(--line); padding: 72px 0 28px; }
.footer-top { display: grid; grid-template-columns: 1.3fr 0.9fr 0.9fr 0.9fr 1.1fr; gap: 32px; padding-bottom: 40px; }
.footer-top h4 { font-size: 0.8rem; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 16px; }
.footer-top ul { list-style: none; margin: 0; padding: 0; }
.footer-top li { margin-bottom: 8px; font-size: 0.92rem; }
.footer-top li a:hover { text-decoration: underline; }
.newsletter-row { display: flex; gap: 0; margin-top: 12px; }
.newsletter-row input { flex: 1; padding: 12px 14px; border: 1px solid var(--line); border-right: none; background: #fff; font-family: var(--font-body); }
.newsletter-row button { border: 1px solid var(--ink); background: var(--ink); color: #fff; padding: 0 20px; font-family: var(--font-display); font-size: 0.8rem; letter-spacing: 0.06em; text-transform: uppercase; cursor: pointer; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 24px; border-top: 1px solid var(--line); font-size: 0.8rem; color: var(--muted); flex-wrap: wrap; gap: 12px; }
.footer-bottom a:hover { text-decoration: underline; }

/* Project detail */
.project-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 82vh;
}
.project-detail-info { padding: 96px 64px; background: var(--paper-soft); }
.project-detail-info .year { font-size: 0.9rem; letter-spacing: 0.1em; color: var(--muted); text-transform: uppercase; }
.project-detail-info h1 { font-size: clamp(2rem, 4vw, 3rem); margin: 4px 0 12px; }
.project-detail-info .subtitle { color: var(--ink-soft); font-size: 1rem; margin-bottom: 32px; }
.project-detail-media {
  position: relative;
  min-height: 420px;
  background-size: cover;
  background-position: center;
  overflow: hidden;
}

.accordion { border-top: 1px solid var(--line); }
.accordion:last-of-type { border-bottom: 1px solid var(--line); }
.accordion summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 0;
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary::after {
  content: "+";
  font-size: 1.1rem;
  transition: transform 0.3s ease;
}
.accordion[open] summary::after { content: "\2212"; }
.accordion .accordion-body { padding: 0 0 20px; font-size: 0.92rem; white-space: pre-line; }

.detail-actions { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }

.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; }
.gallery-grid img { width: 100%; height: 100%; aspect-ratio: 4/3; object-fit: cover; display: block; }
.gallery-grid a { display: block; overflow: hidden; }
.gallery-grid img { transition: transform 0.6s cubic-bezier(.2,.8,.2,1); }
.gallery-grid a:hover img { transform: scale(1.06); }

/* 404 */
.error-page { text-align: center; padding: 140px 0; }
.error-page .code { font-family: var(--font-display); font-size: 6rem; font-weight: 700; }

/* ============================================
   TABLET — 811px to 1024px
   Own layout pass: tighter grid, 2-up cards,
   condensed hero, nav spacing pulled in.
   ============================================ */
@media (max-width: 1024px) {
  :root { --container: 920px; }

  section { padding: 72px 0; }
  section.tight { padding: 48px 0; }

  .main-nav { gap: 22px; }
  .main-nav a { font-size: 0.78rem; }
  .nav-cta .btn { padding: 12px 18px; font-size: 0.78rem; }

  .hero { min-height: 64vh; padding: 80px 0 56px; }
  .hero.small { min-height: 38vh; padding: 64px 0 44px; }
  .hero h1 { font-size: clamp(1.9rem, 5vw, 2.6rem); max-width: 20ch; }

  .split { grid-template-columns: 1fr; gap: 36px; }
  .cta-grid { grid-template-columns: 1fr; gap: 40px; }

  .card-grid, .card-grid.cols-5 { grid-template-columns: repeat(2, 1fr); gap: 20px; }

  .stat-grid { grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .stat-grid .stat-num { font-size: 2.1rem; }

  .detail-cols { grid-template-columns: repeat(3, 1fr); gap: 20px; }

  .step { grid-template-columns: 48px 1fr; gap: 14px; }

  .footer-top { grid-template-columns: 1fr 1fr; gap: 32px 24px; }

  .project-detail { grid-template-columns: 1fr; }
  .project-detail-info { padding: 56px 40px; order: 2; }
  .project-detail-media { min-height: 320px; order: 1; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================
   MOBILE — up to 810px
   Full separate pass: hamburger nav, single
   column everything, compact type & spacing.
   ============================================ */
@media (max-width: 810px) {
  :root { --container: 100%; }
  .container { padding: 0 20px; }

  section { padding: 56px 0; }
  section.tight { padding: 40px 0; }

  /* Header + hamburger */
  .site-header .container { height: 68px; }
  .main-nav { display: none; }
  .nav-cta .btn { padding: 11px 16px; font-size: 0.72rem; }
  .nav-toggle { display: flex; }

  .mobile-nav-panel {
    display: block;
    position: fixed;
    inset: 68px 0 0 0;
    z-index: 45;
    background: var(--paper);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s cubic-bezier(.2,.8,.2,1);
    overflow-y: auto;
  }
  .nav-open .mobile-nav-panel {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .mobile-nav-panel nav {
    display: flex;
    flex-direction: column;
    padding: 32px 24px;
    gap: 4px;
  }
  .mobile-nav-panel a {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
    color: var(--ink);
  }
  .mobile-nav-panel a.active { color: var(--muted); }
  .mobile-nav-panel .btn { margin-top: 24px; align-self: flex-start; }
  .nav-open { overflow: hidden; }

  /* Hero */
  .hero { min-height: 56vh; padding: 64px 0 40px; align-items: center; }
  .hero.small { min-height: 34vh; padding: 52px 0 32px; }
  .hero h1 { font-size: clamp(1.7rem, 8vw, 2.15rem); max-width: 100%; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }

  h2 { font-size: 1.5rem !important; }
  .split h2 { font-size: 1.5rem; }

  .split, .cta-grid { grid-template-columns: 1fr; gap: 28px; }

  .card-grid, .card-grid.cols-5 { grid-template-columns: 1fr; gap: 16px; }

  .stat-grid { grid-template-columns: 1fr; gap: 20px; text-align: left; }
  .stat-grid .stat-num { font-size: 2rem; }

  .detail-cols { grid-template-columns: 1fr; gap: 24px; margin: 28px 0 40px; }

  .step { grid-template-columns: 40px 1fr; gap: 12px; padding: 18px 0; }
  .step-num { font-size: 1.25rem; }

  .cta-band { padding: 56px 0; }

  .form-field input, .form-field textarea { font-size: 16px; } /* prevent iOS zoom */

  .footer-top { grid-template-columns: 1fr; gap: 32px; padding-bottom: 28px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 8px; }

  .error-page { padding: 96px 0; }
  .error-page .code { font-size: 4rem; }

  .project-detail-info { padding: 44px 20px; }
  .gallery-grid { grid-template-columns: 1fr; }
  .detail-actions { flex-direction: column; align-items: stretch; }
}