/* ===========================================================
   3F INDUSTRIES — DESIGN TOKENS
   Concept: cyanotype blueprint meets machine-shop signage.
   =========================================================== */

:root {
  /* color */
  --ink:        #0A0E13;   /* base background */
  --panel:      #10161D;   /* card / panel surface */
  --panel-2:    #151D26;   /* raised panel */
  --line:       #24303B;   /* hairline dividers */
  --blueprint:  #3E7CB1;   /* cyanotype blue — structural lines */
  --blueprint-dim: #2A5578;
  --signal:     #E8A33D;   /* amber machine-indicator accent */
  --signal-dim: #8C6427;
  --paper:      #E7EDF2;   /* primary text, "drafting paper" white */
  --steel:      #8494A3;   /* muted / secondary text */
  --steel-dim:  #4C5A67;

  /* type */
  --font-display: 'Space Grotesk', 'Arial Narrow', sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  --grid-gap: clamp(20px, 4vw, 48px);
}

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

/* ---------- INTRO SPLASH ---------- */
.intro-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 1;
  transition: opacity 0.6s ease;
}
.intro-overlay.is-hidden {
  opacity: 0;
  pointer-events: none;
}
.intro-overlay video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

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

body {
  margin: 0;
  background: var(--ink);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  background-position: -1px -1px;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 56px);
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal);
  display: flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--signal);
  display: inline-block;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--paper);
}

::selection { background: var(--signal); color: var(--ink); }

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

/* ---------- CONSTRUCTION BANNER ---------- */
.construction-banner {
  position: sticky;
  top: 76px;
  z-index: 49;
  background: var(--signal);
  color: var(--ink);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 9px 16px;
}

/* ---------- NAV ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 14, 19, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.01em;
}
.brand .mark {
  width: 38px;
  height: 38px;
  background: var(--paper);
  border: 1px solid var(--blueprint);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  padding: 4px;
}
.brand .mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}
.brand small {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--steel);
  letter-spacing: 0.14em;
  font-weight: 400;
}
.nav-links {
  display: flex;
  gap: clamp(18px, 3vw, 36px);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.nav-links a {
  color: var(--steel);
  position: relative;
  padding: 4px 0;
  transition: color 0.2s ease;
}
.nav-links a:hover { color: var(--paper); }
.nav-links a.active { color: var(--signal); }
.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -3px;
  height: 1px;
  background: var(--signal);
}
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  color: var(--paper);
  width: 40px;
  height: 40px;
  font-family: var(--font-mono);
  cursor: pointer;
}

@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 76px; left: 0; right: 0;
    background: var(--ink);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }
  .nav-links.open { max-height: 320px; }
  .nav-links a { padding: 16px 24px; border-bottom: 1px solid var(--line); }
}

/* ---------- HERO ---------- */
.hero {
  padding: clamp(56px, 9vw, 110px) 0 clamp(40px, 6vw, 70px);
  border-bottom: 1px solid var(--line);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--grid-gap);
  align-items: center;
}
@media (max-width: 880px) {
  .hero-grid { grid-template-columns: 1fr; }
}
.hero h1 {
  font-size: clamp(38px, 6vw, 68px);
  line-height: 1.02;
  margin-top: 18px;
}
.hero h1 em {
  font-style: normal;
  color: var(--blueprint);
}
.hero p.lede {
  color: var(--steel);
  font-size: clamp(15px, 1.6vw, 18px);
  max-width: 46ch;
  margin-top: 20px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.btn {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 14px 22px;
  border: 1px solid var(--line);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}
.btn-primary {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink);
  font-weight: 700;
}
.btn-primary:hover { background: #f4b95c; border-color: #f4b95c; }
.btn-ghost { color: var(--paper); }
.btn-ghost:hover { border-color: var(--blueprint); color: var(--blueprint); }

/* ---------- BLUEPRINT DIAGRAM (signature element) ---------- */
.blueprint-frame {
  border: 1px solid var(--line);
  background: var(--panel);
  position: relative;
  padding: 18px;
}
.blueprint-frame .corner {
  position: absolute;
  width: 10px; height: 10px;
  border: 1px solid var(--blueprint);
}
.blueprint-frame .corner.tl { top: -1px; left: -1px; border-right: none; border-bottom: none; }
.blueprint-frame .corner.tr { top: -1px; right: -1px; border-left: none; border-bottom: none; }
.blueprint-frame .corner.bl { bottom: -1px; left: -1px; border-right: none; border-top: none; }
.blueprint-frame .corner.br { bottom: -1px; right: -1px; border-left: none; border-top: none; }
.blueprint-frame .cap {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--steel-dim);
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}
.diagram-node {
  fill: var(--panel-2);
  stroke: var(--blueprint);
  stroke-width: 1;
}
.diagram-line {
  fill: none;
  stroke: var(--blueprint-dim);
  stroke-width: 1;
  stroke-dasharray: 320;
  stroke-dashoffset: 320;
  animation: draw 1.6s ease forwards;
}
.diagram-line.d2 { animation-delay: 0.15s; }
.diagram-line.d3 { animation-delay: 0.3s; }
.diagram-line.d4 { animation-delay: 0.45s; }
.diagram-line.d5 { animation-delay: 0.6s; }
.diagram-line.d6 { animation-delay: 0.75s; }
@keyframes draw { to { stroke-dashoffset: 0; } }
.diagram-label {
  font-family: var(--font-mono);
  font-size: 9.5px;
  fill: var(--steel);
  letter-spacing: 0.04em;
}
.diagram-id {
  font-family: var(--font-mono);
  font-size: 9px;
  fill: var(--signal);
}
.diagram-core {
  fill: var(--ink);
  stroke: var(--signal);
  stroke-width: 1.2;
}

/* ---------- SECTIONS ---------- */
section { padding: clamp(52px, 8vw, 96px) 0; }
.section-head {
  max-width: 640px;
  margin-bottom: clamp(32px, 5vw, 56px);
}
.section-head h2 {
  font-size: clamp(28px, 4vw, 42px);
  margin-top: 14px;
}
.section-head p {
  color: var(--steel);
  margin-top: 14px;
  font-size: 15.5px;
}
.divider { border: none; border-top: 1px solid var(--line); }

/* ---------- STATEMENT ---------- */
.statement {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-align: left;
}
.statement p {
  font-family: var(--font-display);
  font-size: clamp(24px, 4.4vw, 46px);
  line-height: 1.25;
  max-width: 16ch;
  color: var(--paper);
}
.statement p .accent { color: var(--signal); }

/* ---------- CARDS / SPEC GRID ---------- */
.grid-6 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
@media (max-width: 880px) {
  .grid-6 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .grid-6 { grid-template-columns: 1fr; }
}
.spec-card {
  background: var(--panel);
  padding: 28px 24px;
  min-height: 220px;
  display: flex;
  flex-direction: column;
  transition: background 0.2s ease;
}
.spec-card:hover { background: var(--panel-2); }
.spec-card .id {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--signal);
  letter-spacing: 0.1em;
}
.spec-card h3 {
  font-size: 19px;
  margin-top: 14px;
}
.spec-icon {
  width: 36px;
  height: 36px;
  margin-top: auto;
  align-self: flex-end;
  filter: invert(1);
  opacity: 0.85;
}
.spec-card p {
  color: var(--steel);
  font-size: 14px;
  margin-top: 10px;
  flex-grow: 1;
}
.spec-card .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--steel-dim);
}
.spec-card .tags span {
  border: 1px solid var(--line);
  padding: 3px 8px;
}

/* ---------- SERVICES DETAIL (services page) ---------- */
.service-row {
  display: grid;
  grid-template-columns: 90px 1fr 1.3fr;
  gap: var(--grid-gap);
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}
@media (max-width: 780px) {
  .service-row { grid-template-columns: 1fr; gap: 12px; }
}
.service-row .num {
  font-family: var(--font-mono);
  color: var(--blueprint);
  font-size: 13px;
}
.service-row h3 {
  font-size: 24px;
}
.service-row .desc p { color: var(--steel); font-size: 15px; margin: 0 0 14px; }
.service-row .desc ul { margin: 0; padding-left: 18px; color: var(--steel); font-size: 14px; }
.service-row .desc li { margin-bottom: 6px; }
.service-row .thumb { grid-column: 1 / -1; margin-top: 24px; }
.service-row .thumb img {
  display: block;
  width: 100%;
  max-height: 320px;
  object-fit: cover;
  border: 1px solid var(--line);
}

/* ---------- ABOUT ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gap);
}
@media (max-width: 860px) { .about-grid { grid-template-columns: 1fr; } }
.owner-photo {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 320px;
  object-fit: cover;
  border: 1px solid var(--line);
}
.fact-list { list-style: none; margin: 0; padding: 0; }
.fact-list li {
  display: flex;
  justify-content: space-between;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}
.fact-list li span:first-child {
  font-family: var(--font-mono);
  color: var(--steel);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 11.5px;
}
.fact-list li span:last-child { color: var(--paper); text-align: right; }

/* ---------- CONTACT ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gap);
}
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; } }
.field { margin-bottom: 20px; }
.field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 8px;
}
.field input, .field textarea, .field select {
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--paper);
  padding: 13px 14px;
  font-family: var(--font-body);
  font-size: 14.5px;
  resize: vertical;
}
.field input:focus, .field textarea:focus, .field select:focus {
  border-color: var(--blueprint);
  outline: none;
}
.contact-info-card {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 32px;
}
.contact-info-card .row {
  display: flex;
  justify-content: space-between;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}
.contact-info-card .row:last-child { border-bottom: none; }
.contact-info-card .row span:first-child {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--steel);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.form-status {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--signal);
  min-height: 18px;
}

/* ---------- PROJECTS & AFFILIATIONS ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(28px, 4vw, 44px);
}
.filter-tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--steel);
  background: transparent;
  border: 1px solid var(--line);
  padding: 9px 16px;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}
.filter-tag:hover { color: var(--paper); border-color: var(--steel); }
.filter-tag.active { background: var(--signal); border-color: var(--signal); color: var(--ink); }

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap);
}
@media (max-width: 880px) { .project-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .project-grid { grid-template-columns: 1fr; } }
.project-card {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: background 0.2s ease;
}
.project-card:hover { background: var(--panel-2); }
.project-card.is-hidden { display: none; }
.project-empty {
  display: none;
  color: var(--steel);
  font-size: 14px;
  border: 1px dashed var(--steel-dim);
  padding: 20px;
}
.project-empty.is-visible { display: block; }
.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.tag-pill {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--steel);
  border: 1px solid var(--line);
  padding: 3px 9px;
}
.status-pill {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--signal);
  padding: 3px 9px;
}
.project-card h3 { font-size: 18px; }
.project-card p { color: var(--steel); font-size: 14px; margin-top: 12px; flex-grow: 1; }
.project-card p + p { flex-grow: 0; }
.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--steel-dim);
}
.chip-list span { border: 1px solid var(--line); padding: 4px 9px; }
.project-card .project-thumb {
  display: block;
  width: 100%;
  max-height: 180px;
  object-fit: cover;
  border: 1px solid var(--line);
  margin-top: 18px;
}

/* ---- rich feature cards: affiliations & past projects ---- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--grid-gap);
}
@media (max-width: 780px) { .feature-grid { grid-template-columns: 1fr; } }
.feature-card {
  background: var(--panel);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  transition: background 0.2s ease;
}
.feature-card:hover { background: var(--panel-2); }
.feature-banner {
  display: block;
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-bottom: 1px solid var(--line);
}
.feature-banner.is-badge {
  object-fit: contain;
  background: var(--ink);
  padding: 24px;
}
.feature-body { padding: 26px; display: flex; flex-direction: column; flex-grow: 1; }
.feature-body h3 { font-size: 19px; }
.feature-body .desc { color: var(--steel); font-size: 14.5px; margin-top: 12px; }
.contrib-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--steel-dim);
  margin-top: 20px;
}
.contrib-list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  font-size: 13.5px;
  color: var(--steel);
}
.contrib-list li { padding: 4px 0; }
.contrib-list li::before { content: "— "; color: var(--signal); }
.feature-link {
  margin-top: 20px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--signal);
  text-decoration: none;
}
.feature-link:hover { text-decoration: underline; }
.feature-link.is-disabled { color: var(--steel-dim); }

/* ---------- RESOURCES ---------- */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap);
}
@media (max-width: 880px) { .resource-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .resource-grid { grid-template-columns: 1fr; } }
.resource-card {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: background 0.2s ease;
}
.resource-card:hover { background: var(--panel-2); }
.resource-card h3 { font-size: 19px; margin-top: 16px; }
.resource-card p { color: var(--steel); font-size: 14px; margin-top: 10px; flex-grow: 1; }
.resource-card .feature-link { margin-top: 18px; }

.breadcrumb-back {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--steel);
}
.breadcrumb-back:hover { color: var(--signal); }

.guide-image-slot {
  border: 1px dashed var(--steel-dim);
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-align: center;
  padding: 90px 20px;
  margin-bottom: clamp(28px, 4vw, 44px);
}
.guide-image-slot img {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
}

/* ---------- FOOTER ---------- */
footer {
  border-top: 1px solid var(--line);
  padding: 40px 0;
}
footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
footer .mono { font-size: 11px; color: var(--steel-dim); }
footer .foot-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
footer .foot-brand img {
  width: 24px;
  height: 24px;
  background: var(--paper);
  border: 1px solid var(--blueprint);
  padding: 2px;
  object-fit: contain;
}