@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:wght@400;500;600;700&family=Inter:wght@300;400;500;600;700&display=swap');

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body, h1, h2, h3, h4, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
button, input, textarea, select { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Design tokens ---------- */
:root {
  --color-bg: #F7F5F0;
  --color-fg: #1C1B18;
  --color-muted: #8B8677;
  --color-border: #E4DFD2;
  --color-line: var(--color-fg);

  --font-heading: 'Cormorant Garamond', Georgia, serif;
  --font-body: 'Inter', 'Helvetica Neue', Arial, sans-serif;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 96px;

  --container-w: 1200px;
  --radius: 2px;
  --transition: 200ms ease-out;
  --header-h: 72px;
}

html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-fg);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.01em;
}

p { color: var(--color-fg); }
.text-muted { color: var(--color-muted); }

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

/* ---------- Layout ---------- */
.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.section { padding: var(--space-8) 0; }
.section--tight { padding: var(--space-6) 0; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 14px 28px;
  min-height: 48px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  border: 1.5px solid var(--color-fg);
  border-radius: var(--radius);
  background: var(--color-fg);
  color: var(--color-bg);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}
.btn:hover { background: var(--color-bg); color: var(--color-fg); }
.btn:active { transform: scale(0.98); }

.btn--outline {
  background: transparent;
  color: var(--color-fg);
}
.btn--outline:hover { background: var(--color-fg); color: var(--color-bg); }

.btn-row { display: flex; flex-wrap: wrap; gap: var(--space-3); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.logo {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.3rem;
  letter-spacing: -0.005em;
}
.logo__mark { font-size: 1.1rem; color: var(--color-muted); font-weight: 400; }
.logo span { color: var(--color-muted); font-weight: 400; }

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.nav__links {
  display: flex;
  gap: var(--space-5);
}
.nav__links a {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  padding: var(--space-2) 0;
  position: relative;
}
.nav__links a::after {
  content: '';
  position: absolute;
  left: 0; right: 100%;
  bottom: -2px;
  height: 2px;
  background: var(--color-fg);
  transition: right var(--transition);
}
.nav__links a:hover::after,
.nav__links a[aria-current="page"]::after { right: 0; }
.nav__links a[aria-current="page"] { color: var(--color-fg); }

.lang-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-body);
  font-size: 0.85rem;
}
.lang-switch a { color: var(--color-muted); }
.lang-switch a:hover { color: var(--color-fg); }
.lang-switch span[aria-current] { color: var(--color-fg); font-weight: 600; }
.lang-switch__divider { color: var(--color-border); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--space-2);
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

/* ---------- Footer ---------- */
.site-footer {
  padding: var(--space-7) 0 var(--space-5);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}
.footer-grid h4 {
  font-family: var(--font-body);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  margin-bottom: var(--space-3);
  font-weight: 600;
}
.footer-grid ul li { margin-bottom: var(--space-2); }
.footer-grid ul a:hover { text-decoration: underline; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding-top: var(--space-4);
  font-size: 0.85rem;
  color: var(--color-muted);
}

/* ---------- Hero ---------- */
.hero {
  padding: var(--space-8) 0;
  overflow: hidden;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: var(--space-6);
}
.hero h1 {
  font-size: clamp(2.75rem, 7vw, 5.5rem);
  max-width: 16ch;
}
.hero__sub {
  margin-top: var(--space-4);
  max-width: 55ch;
  font-size: 1.15rem;
  color: var(--color-muted);
}
.hero .btn-row { margin-top: var(--space-5); }

/* Wireframe hero object: a set of CSS-3D rings (pure transforms, no canvas,
   no WebGL) — a few "meridian" circles rotated around Y plus one near-flat
   "equator" ring, spinning continuously via a CSS keyframe animation. A
   dashed crosshair sits behind it as a fixed diagram reference. */
.hero__object {
  position: relative;
  width: 100%;
  max-width: 460px;
  aspect-ratio: 1 / 1;
  margin: 0 auto;
}
.hero__object::before,
.hero__object::after {
  content: '';
  position: absolute;
  opacity: 0.55;
}
.hero__object::before {
  left: 2%;
  right: 2%;
  top: 50%;
  border-top: 1px dashed var(--color-line);
}
.hero__object::after {
  top: 2%;
  bottom: 2%;
  left: 50%;
  border-left: 1px dashed var(--color-line);
}

.cad-object {
  width: 100%;
  height: 100%;
  perspective: 1100px;
}

/* JS-controlled layer: a small, damped rotation nudge that follows the
   cursor, layered underneath the always-on CSS spin below. */
.cad-tilt {
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
}

/* Pure-CSS continuous spin — GPU-accelerated, runs with zero JS once
   started, and keeps going even if the cursor-tilt layer is idle. */
.cad-inner {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  animation: spinY 28s linear infinite;
}

/* Each edge is a rounded bar spanning two icosahedron vertices; width,
   thickness, and the translate3d/rotate3d transform are computed in JS
   from real pixel coordinates (see hero-object.js) and set inline. */
.edge {
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--color-line);
  border-radius: 999px;
  opacity: 0.8;
  transform-origin: 0 50%;
}

@keyframes spinY {
  from { transform: rotateY(0deg) rotateX(6deg); }
  to { transform: rotateY(360deg) rotateX(6deg); }
}

@media (prefers-reduced-motion: reduce) {
  .cad-inner { animation: none; }
}

/* ---------- Page header (non-home) ---------- */
.page-header {
  padding: var(--space-7) 0 var(--space-6);
  border-bottom: 1px solid var(--color-border);
}
.page-header__eyebrow {
  font-family: var(--font-body);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-muted);
  margin-bottom: var(--space-3);
}
.page-header h1 { font-size: clamp(2.25rem, 5vw, 3.75rem); }
.page-header p { margin-top: var(--space-3); max-width: 60ch; font-size: 1.05rem; color: var(--color-muted); }

/* ---------- Category cards (home) ---------- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}
.category-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-5);
  transition: border-color var(--transition), transform var(--transition);
  display: block;
}
.category-card:hover { border-color: var(--color-fg); transform: translateY(-2px); }
.category-card__icon { margin-bottom: var(--space-4); }
.category-card h3 { font-size: 1.3rem; margin-bottom: var(--space-2); }
.category-card p { color: var(--color-muted); font-size: 0.95rem; }
.category-card__link {
  margin-top: var(--space-3);
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
}

/* ---------- Section heading row ---------- */
.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}
.section-heading h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }

/* ---------- Project grid & cards ---------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}
.project-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}
.project-card:hover { border-color: var(--color-fg); }
.project-card__body { padding: var(--space-4); }
.project-card h3 { font-size: 1.1rem; margin: var(--space-2) 0 var(--space-2); }
.project-card p { font-size: 0.92rem; color: var(--color-muted); }

.tag {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border: 1px solid var(--color-fg);
  border-radius: 100px;
}

/* Placeholder media block (swap for real images later) */
.placeholder-img {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  background:
    repeating-linear-gradient(135deg, var(--color-border) 0 2px, transparent 2px 14px);
  background-color: #FAFAFA;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.placeholder-img span {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  background: var(--color-bg);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
}

/* ---------- Filter bar ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}
.filter-btn {
  padding: 10px 20px;
  min-height: 44px;
  border: 1.5px solid var(--color-border);
  border-radius: 100px;
  background: transparent;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.filter-btn:hover { border-color: var(--color-fg); }
.filter-btn[aria-pressed="true"] {
  background: var(--color-fg);
  border-color: var(--color-fg);
  color: var(--color-bg);
}

.project-card[hidden] { display: none; }

.empty-state {
  padding: var(--space-7) 0;
  text-align: center;
  color: var(--color-muted);
}

/* ---------- About: process steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  counter-reset: step;
}
.step {
  border-top: 2px solid var(--color-fg);
  padding-top: var(--space-3);
}
.step__num {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: var(--space-2);
}
.step h3 { font-size: 1.15rem; margin-bottom: var(--space-2); }
.step p { font-size: 0.92rem; color: var(--color-muted); }

.about-media {
  aspect-ratio: 16 / 9;
}

.value-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4) var(--space-6);
}
.value-list--3col { grid-template-columns: repeat(3, 1fr); }
.value-list li { border-bottom: 1px solid var(--color-border); padding-bottom: var(--space-3); }
.value-list h4 { font-size: 1.05rem; margin-bottom: var(--space-1); }
.value-list p { font-size: 0.92rem; color: var(--color-muted); }

/* ---------- Contact / form ---------- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: var(--space-7);
  align-items: start;
}
.contact-info h2 { font-size: 1.6rem; margin-bottom: var(--space-3); }
.contact-info p { color: var(--color-muted); margin-bottom: var(--space-5); }
.contact-detail { margin-bottom: var(--space-4); }
.contact-detail h4 {
  font-family: var(--font-body);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  margin-bottom: var(--space-1);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}
.form-field { display: flex; flex-direction: column; gap: var(--space-2); }
.form-field--full { grid-column: 1 / -1; }

label {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
}
.optional-tag { font-family: var(--font-body); font-weight: 400; color: var(--color-muted); font-size: 0.8rem; }

input, textarea, select {
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px 14px;
  min-height: 48px;
  background: var(--color-bg);
  font-size: 1rem;
  width: 100%;
  transition: border-color var(--transition);
}
textarea { min-height: 140px; resize: vertical; }
input:hover, textarea:hover, select:hover { border-color: var(--color-fg); }
input:focus, textarea:focus, select:focus {
  border-color: var(--color-fg);
  outline: none;
  box-shadow: 0 0 0 3px rgba(10,10,10,0.08);
}
.field-hint { font-size: 0.82rem; color: var(--color-muted); }
.field-error {
  font-size: 0.82rem;
  color: #B3261E;
  display: none;
}
.form-field.has-error input,
.form-field.has-error textarea,
.form-field.has-error select { border-color: #B3261E; }
.form-field.has-error .field-error { display: block; }

.file-drop {
  border: 1.5px dashed var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4);
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition);
}
.file-drop:hover { border-color: var(--color-fg); }
.file-drop input[type="file"] { display: none; }
.file-drop__label { font-size: 0.9rem; color: var(--color-muted); }
.file-drop__list { margin-top: var(--space-2); font-size: 0.85rem; text-align: left; }

.form-submit-row {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-2);
}

.form-success {
  display: none;
  border: 1.5px solid var(--color-fg);
  border-radius: var(--radius);
  padding: var(--space-6);
  text-align: center;
}
.form-success.is-visible { display: block; }
.request-form.is-hidden { display: none; }

/* ---------- CTA banner ---------- */
.cta-banner {
  text-align: center;
  padding: var(--space-8) 0;
}
.cta-banner h2 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  max-width: 20ch;
  margin: 0 auto var(--space-4);
}

/* ---------- Icons ---------- */
.icon { width: 24px; height: 24px; flex-shrink: 0; }
.icon--sm { width: 18px; height: 18px; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  :root { --header-h: 64px; }
  .nav { position: fixed; inset: 64px 0 0 0; background: var(--color-bg);
    flex-direction: column; align-items: flex-start; padding: var(--space-5) var(--space-4);
    transform: translateX(100%); transition: transform var(--transition); overflow-y: auto; }
  .nav.is-open { transform: translateX(0); }
  .nav__links { flex-direction: column; gap: var(--space-4); width: 100%; }
  .nav__links a { display: block; font-size: 1.5rem; }
  .nav-toggle { display: inline-flex; }
  .nav .btn { width: 100%; justify-content: center; margin-top: var(--space-4); }
  .lang-switch { margin-top: var(--space-5); font-size: 1rem; }

  .project-grid, .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); gap: var(--space-5); }
  .value-list--3col { grid-template-columns: repeat(2, 1fr); }
  .contact-layout { grid-template-columns: 1fr; gap: var(--space-6); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero__object { max-width: 340px; }
}

@media (max-width: 768px) {
  .project-grid, .grid-3, .form-grid, .value-list { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-5); }
  .section { padding: var(--space-6) 0; }
  .section-heading { align-items: flex-start; flex-direction: column; }

  .hero__grid { grid-template-columns: 1fr; }
  .hero__object { max-width: 280px; margin-top: var(--space-6); }
}

@media (max-width: 480px) {
  .btn-row, .filter-bar { flex-direction: column; align-items: stretch; }
  .filter-bar { flex-direction: row; flex-wrap: wrap; }
}