/* ---------- base ---------- */
html {
  scroll-behavior: smooth;
}
::selection {
  background: #E8871E;
  color: #081420;
}
body {
  overflow-x: hidden;
}
section[id] {
  scroll-margin-top: 84px;
}
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: #0E2238; }
::-webkit-scrollbar-thumb { background: #33475C; border: 2px solid #0E2238; border-radius: 0; }

:focus-visible {
  outline: 2px solid #E8871E;
  outline-offset: 3px;
}

/* ---------- header ---------- */
#site-header {
  background: linear-gradient(to bottom, rgba(8,20,32,0.75), transparent);
}
#site-header.scrolled {
  background: rgba(8, 20, 32, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.nav-link {
  position: relative;
  color: #C9D2DA;
  padding-bottom: 4px;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  height: 1px; width: 100%;
  background: #E8871E;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s ease;
}
.nav-link:hover { color: #EEF1EF; }
.nav-link:hover::after,
.nav-link.active::after { transform: scaleX(1); }
.nav-link.active { color: #EEF1EF; }

.mobile-nav-link {
  padding: 0.85rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  color: #C9D2DA;
}

.burger, .burger::before, .burger::after {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  position: relative;
  transition: transform .25s ease, opacity .25s ease;
}
.burger::before, .burger::after {
  content: "";
  position: absolute;
  left: 0;
}
.burger::before { top: -7px; }
.burger::after { top: 7px; }
#nav-toggle[aria-expanded="true"] .burger { background: transparent; }
#nav-toggle[aria-expanded="true"] .burger::before { transform: translateY(7px) rotate(45deg); }
#nav-toggle[aria-expanded="true"] .burger::after { transform: translateY(-7px) rotate(-45deg); }

/* ---------- spine (drafting-margin navigation) ---------- */
.spine {
  position: fixed;
  left: 28px;
  top: 0;
  bottom: 0;
  z-index: 30;
  display: none;
  align-items: center;
  pointer-events: none;
}
@media (min-width: 1280px) {
  .spine { display: flex; }
}
.spine-line {
  position: absolute;
  left: 3px;
  top: 8%;
  bottom: 8%;
  width: 1px;
  background: rgba(255,255,255,0.12);
}
.spine-ticks {
  display: flex;
  flex-direction: column;
  gap: 2.15rem;
  pointer-events: auto;
}
.spine-tick {
  position: relative;
  width: 7px;
  height: 7px;
  border-radius: 0;
  background: rgba(255,255,255,0.25);
  transform: rotate(45deg);
  transition: background .25s ease, transform .25s ease;
  cursor: pointer;
}
.spine-tick:hover,
.spine-tick.active {
  background: #E8871E;
  transform: rotate(45deg) scale(1.3);
}
.spine-tick span {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%) rotate(-45deg);
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.1em;
  color: #EEF1EF;
  white-space: nowrap;
  opacity: 0;
  transition: opacity .2s ease;
}
.spine-tick:hover span { opacity: 0.85; }

/* ---------- buttons ---------- */
.btn-chamfer {
  display: inline-block;
  position: relative;
  padding: 0.85rem 1.75rem;
  font-family: "Big Shoulders Text", sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  clip-path: polygon(14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%, 0 14px);
  transition: transform .2s ease, background-color .2s ease, color .2s ease;
}
.btn-chamfer:hover { transform: translateY(-2px); }
.btn-amber {
  background: #E8871E;
  color: #081420;
}
.btn-amber:hover { background: #F2A94D; }
.btn-ghost {
  background: transparent;
  color: #EEF1EF;
  border: 1px solid rgba(255,255,255,0.35);
}
.btn-ghost:hover { border-color: #E8871E; color: #E8871E; }
.btn-navy {
  background: #0E2238;
  color: #EEF1EF;
}
.btn-navy:hover { background: #15263A; }

/* ---------- chamfered plates ---------- */
.chamfer-lg {
  clip-path: polygon(28px 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%, 0 28px);
}
.chamfer-sm {
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
}
.tag-plate {
  background: #081420;
  border: 1px solid rgba(255,255,255,0.12);
  padding: 0.6rem 1rem;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}
.tag-plate span { color: #94A3B3; }

/* ---------- hero ---------- */
.grid-overlay {
  background-image:
    linear-gradient(rgba(255,255,255,0.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.5) 1px, transparent 1px);
  background-size: 64px 64px;
}

.parallax-layer {
  will-change: transform;
}

.hero-shutter { z-index: 5; }
.shutter-slat {
  flex: 1 0 auto;
  background: #081420;
  transform: translateY(0);
  animation: shutter-open 0.85s cubic-bezier(.76,0,.24,1) forwards;
  animation-delay: calc(var(--i, 0) * 55ms + 120ms);
}
.shutter-slat:nth-child(1) { --i: 0; }
.shutter-slat:nth-child(2) { --i: 1; }
.shutter-slat:nth-child(3) { --i: 2; }
.shutter-slat:nth-child(4) { --i: 3; }
.shutter-slat:nth-child(5) { --i: 4; }
.shutter-slat:nth-child(6) { --i: 5; }
.shutter-slat:nth-child(7) { --i: 6; }
.shutter-slat:nth-child(8) { --i: 7; }

@keyframes shutter-open {
  to { transform: translateY(-100%); }
}

.hero-line { overflow: hidden; }
.hero-line-inner {
  display: inline-block;
  transform: translateY(115%);
  animation: line-up 0.85s cubic-bezier(.16,1,.3,1) forwards;
  animation-delay: calc(var(--d, 0) * 90ms + 650ms);
}
p.hero-line, div.hero-line {
  opacity: 0;
  transform: translateY(14px);
  animation: fade-up 0.7s ease forwards;
  animation-delay: calc(var(--d, 0) * 90ms + 650ms);
}
@keyframes line-up {
  to { transform: translateY(0); }
}
@keyframes fade-up {
  to { opacity: 1; transform: translateY(0); }
}

.scroll-cue-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, currentColor, transparent);
  animation: cue-pulse 2s ease-in-out infinite;
}
@keyframes cue-pulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* ---------- section heading with draw-in rule ---------- */
.section-heading {
  font-family: "Big Shoulders Display", sans-serif;
  font-weight: 700;
  text-transform: uppercase;
  font-size: clamp(2rem, 4.2vw, 3.25rem);
  line-height: 0.98;
  position: relative;
  padding-bottom: 1.35rem;
}
.section-heading::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  height: 3px;
  width: 64px;
  background: #E8871E;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .8s cubic-bezier(.16,1,.3,1);
}
.section-heading.is-visible::after {
  transform: scaleX(1);
}

/* ---------- stats ---------- */
.stat { position: relative; }

/* ---------- general notes list (why us) ---------- */
.note-item {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 1.5rem;
  padding: 1.75rem 0;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .6s ease, transform .6s ease;
}
.note-item.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.note-index {
  font-family: "Big Shoulders Display", sans-serif;
  font-weight: 700;
  font-size: 1.75rem;
  color: #E8871E;
  line-height: 1;
}
.note-title {
  font-family: "Big Shoulders Text", sans-serif;
  font-weight: 600;
  font-size: 1.25rem;
  color: #EEF1EF;
  margin-bottom: 0.4rem;
}
.note-copy {
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 0.95rem;
  color: #94A3B3;
  line-height: 1.6;
  max-width: 46ch;
}

/* ---------- services bay row ---------- */
.bay-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid rgba(255,255,255,0.1);
  border-left: 1px solid rgba(255,255,255,0.1);
}
@media (max-width: 900px) {
  .bay-row { grid-template-columns: 1fr; }
}
.bay {
  border-right: 1px solid rgba(255,255,255,0.1);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  padding: 2.5rem 1.75rem;
  transition: background-color .3s ease, flex-grow .3s ease;
  position: relative;
}
.bay:hover {
  background: rgba(232,135,30,0.06);
}
.bay-icon {
  width: 44px;
  height: 44px;
  color: #E8871E;
  margin-bottom: 1.5rem;
}
.bay-icon svg { width: 100%; height: 100%; }
.bay-title {
  font-family: "Big Shoulders Text", sans-serif;
  font-weight: 600;
  font-size: 1.4rem;
  color: #EEF1EF;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}
.bay-copy {
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 0.9rem;
  color: #94A3B3;
  line-height: 1.55;
}

/* ---------- callouts (PEB system) ---------- */
.callout {
  position: absolute;
  max-width: 220px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  line-height: 1.5;
  color: #EEF1EF;
  background: rgba(8,20,32,0.85);
  border-left: 2px solid #E8871E;
  padding: 0.5rem 0.75rem;
}

/* ---------- check list (sustainability) ---------- */
.check-item {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  font-family: "IBM Plex Sans", sans-serif;
  color: #2B3540;
  font-size: 1.02rem;
}
.check-box {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  border: 2px solid #5F7F58;
  position: relative;
}
.check-box::after {
  content: "";
  position: absolute;
  left: 3px; top: 5px;
  width: 10px; height: 5px;
  border-left: 2px solid #5F7F58;
  border-bottom: 2px solid #5F7F58;
  transform: rotate(-45deg);
}

/* ---------- standards code plates ---------- */
.code-plate {
  position: relative;
  border: 1px solid rgba(255,255,255,0.15);
  padding: 1.4rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.code-plate::before,
.code-plate::after {
  content: "";
  position: absolute;
  width: 4px; height: 4px;
  background: rgba(255,255,255,0.35);
  border-radius: 50%;
}
.code-plate::before { top: 6px; left: 6px; }
.code-plate::after { bottom: 6px; right: 6px; }
.code-plate-sub {
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 0.75rem;
  color: #94A3B3;
}

/* ---------- projects ---------- */
.project-card {
  position: relative;
  display: block;
  overflow: hidden;
  cursor: default;
}
.project-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(8,20,32,0.85), transparent 55%);
}
.project-tag {
  position: absolute;
  left: 1.25rem;
  bottom: 1.25rem;
  z-index: 2;
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.03em;
  color: #EEF1EF;
  padding-left: 1rem;
  border-left: 2px solid #E8871E;
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-line-inner, p.hero-line, div.hero-line, .shutter-slat, .scroll-cue-line, .note-item, .section-heading::after {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
  .parallax-layer { transform: none !important; }
}