/* Foundry 17 Technical Atelier — Styles */

:root {
  --iron-950: #0c0c0d;
  --iron-900: #121213;
  --iron-800: #1a1a1c;
  --iron-700: #222224;
  --iron-600: #2d2d30;
  --graphite: #4a4a4d;
  --brass: #c4a455;
  --brass-dim: #8c7d42;
  --brass-glow: rgba(196, 164, 85, 0.15);
  --light: #f0ece2;
  --light-dim: #b0aba4;
  --danger: #a04548;
  --font-head: 'Oswald', sans-serif;
  --font-body: 'Inter', sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  background-color: var(--iron-900);
  color: var(--light);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Tactile grain overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.7' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  opacity: 0.04;
  pointer-events: none;
  z-index: 10000;
}

@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;
  }
}

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

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--brass);
  color: var(--iron-950);
  font-family: var(--font-head);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 8px 16px;
  z-index: 200;
  text-decoration: none;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
}

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(18, 18, 19, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--iron-700);
}

.main-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--brass);
  border: 2px solid var(--brass);
  padding: 3px 7px;
  line-height: 1;
  letter-spacing: 0.02em;
}

.brand-name {
  font-family: var(--font-head);
  font-size: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--light);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--light);
  transition: transform 0.3s, opacity 0.3s;
}

.hamburger {
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
}

.hamburger::before {
  top: -8px;
}

.hamburger::after {
  top: 8px;
}

.nav-list {
  display: flex;
  gap: 36px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  color: var(--light-dim);
  text-decoration: none;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
  font-weight: 500;
}

.nav-list a:hover,
.nav-list a:focus {
  color: var(--brass);
  border-bottom-color: var(--brass);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: var(--iron-800);
    flex-direction: column;
    padding: 24px;
    gap: 18px;
    border-bottom: 1px solid var(--iron-700);
  }

  .nav-list.active {
    display: flex;
  }
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-visual {
  position: absolute;
  inset: 0;
  background-image: url('https://images.unsplash.com/photo-1537462715872-731124dcce65?auto=format&fit=crop&w=1920&q=80');
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  filter: brightness(0.45) saturate(0.65) contrast(1.1);
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(12,12,13,0.7) 0%, rgba(12,12,13,0.2) 50%, rgba(12,12,13,0.6) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

#hero-headline {
  font-family: var(--font-head);
  font-size: clamp(2.8rem, 7vw, 5.8rem);
  line-height: 1.05;
  text-transform: uppercase;
  color: var(--light);
  margin: 0 0 24px;
  max-width: 850px;
  letter-spacing: -0.01em;
  text-shadow: 0 2px 0 rgba(0,0,0,0.5), 0 -1px 0 rgba(255,255,255,0.08);
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--light-dim);
  max-width: 520px;
  margin: 0 0 40px;
  line-height: 1.55;
  font-weight: 400;
}

.cta-button {
  display: inline-block;
  padding: 18px 36px;
  border: 2px solid var(--brass);
  color: var(--brass);
  text-decoration: none;
  text-transform: uppercase;
  font-family: var(--font-head);
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  font-weight: 500;
  transition: background 0.25s ease, color 0.25s ease, transform 0.25s ease;
}

.cta-button:hover,
.cta-button:focus {
  background: var(--brass);
  color: var(--iron-950);
  transform: translateY(-2px);
}

/* Section common */
section {
  position: relative;
}

.section-heading {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.2rem);
  text-transform: uppercase;
  color: var(--light);
  margin: 0 0 48px;
  letter-spacing: 0.02em;
}

/* About */
.about {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 120px 24px;
  align-items: center;
}

.about-image {
  position: relative;
  border: 1px solid var(--iron-700);
}

.about-image img {
  display: block;
  width: 100%;
  height: auto;
  filter: grayscale(0.25) contrast(1.05);
}

.about-content p {
  color: var(--light-dim);
  margin: 0 0 20px;
  font-size: 1.05rem;
}

.about-content p strong {
  color: var(--light);
  font-weight: 600;
}

/* QC Gauge */
.qc-measurement {
  margin-top: 32px;
  max-width: 280px;
}

.qc-gauge {
  width: 100%;
  height: auto;
  display: block;
  overflow: visible;
}

/* Skills */
.skills {
  background: var(--iron-800);
  position: relative;
  overflow: hidden;
}

.skills::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(196,164,85,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(196,164,85,0.04) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.skills-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 120px 24px;
  position: relative;
  z-index: 1;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.skill-card {
  background: var(--iron-700);
  border: 1px solid var(--iron-600);
  padding: 32px;
  transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.skill-card:hover {
  border-color: var(--brass-dim);
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.35);
}

.skill-card h3 {
  font-family: var(--font-head);
  font-size: 1.35rem;
  text-transform: uppercase;
  margin: 20px 0 12px;
  color: var(--light);
  letter-spacing: 0.03em;
}

.skill-card p {
  color: var(--light-dim);
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Diagrams */
.diagram-svg {
  width: 100%;
  height: 140px;
  display: block;
}

.diagram-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.d-btn {
  background: transparent;
  border: 1px solid var(--iron-600);
  color: var(--light-dim);
  font-family: var(--font-body);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 6px 12px;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.d-btn:hover,
.d-btn:focus,
.d-btn.active {
  background: var(--brass-glow);
  border-color: var(--brass);
  color: var(--brass);
}

.diagram-part {
  transition: fill 0.3s ease, filter 0.3s ease;
}

.active-part {
  fill: var(--brass) !important;
  filter: drop-shadow(0 0 5px rgba(196,164,85,0.35));
}

.robot-part {
  transition: fill 0.25s ease;
  cursor: pointer;
}

.robot-part:hover,
.robot-part:focus {
  fill: var(--brass);
}

.diagram-readout {
  margin-top: 14px;
  min-height: 52px;
}

.diagram-readout p {
  font-size: 0.88rem;
  color: var(--light-dim);
  margin: 0;
}

.diagram-readout strong {
  color: var(--brass);
}

.readout-default {
  opacity: 1;
}

.readout-text[hidden] {
  display: none;
}

.diagram-tooltip {
  position: absolute;
  background: var(--iron-800);
  border: 1px solid var(--brass);
  color: var(--light);
  padding: 8px 12px;
  font-size: 0.8rem;
  max-width: 220px;
  pointer-events: none;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.2s, transform 0.2s;
  z-index: 20;
}

.diagram-tooltip.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Machine Floor */
.machine-floor-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 120px 24px;
}

.filter-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 48px;
}

.filter-btn {
  background: transparent;
  border: 1px solid var(--iron-600);
  color: var(--light-dim);
  padding: 10px 22px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
  font-weight: 500;
}

.filter-btn:hover,
.filter-btn:focus {
  border-color: var(--brass);
  color: var(--brass);
}

.filter-btn.active {
  border-color: var(--brass);
  color: var(--brass);
  background: rgba(196, 164, 85, 0.08);
}

/* Timeline */
.timeline-wrapper {
  background: var(--iron-700);
  border: 1px solid var(--iron-600);
  padding: 32px;
  margin-bottom: 56px;
}

.timeline-title {
  font-family: var(--font-head);
  font-size: 1.1rem;
  text-transform: uppercase;
  margin: 0 0 28px;
  color: var(--light-dim);
  letter-spacing: 0.06em;
}

.cnc-timeline {
  position: relative;
}

.timeline-fill {
  position: absolute;
  top: 16px;
  left: 12.5%;
  width: 0%;
  height: 2px;
  background: var(--brass);
  z-index: 1;
  transition: width 1.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.timeline-steps {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  z-index: 2;
}

.timeline-step {
  flex: 1;
  text-align: center;
  position: relative;
}

.step-marker {
  display: block;
  width: 34px;
  height: 34px;
  margin: 0 auto 14px;
  border-radius: 50%;
  background: var(--iron-800);
  border: 2px solid var(--graphite);
  transition: border-color 0.4s ease, background 0.4s ease;
  position: relative;
}

.step-marker::before {
  content: attr(data-step);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-head);
  font-size: 0.875rem;
  color: var(--light-dim);
}

.timeline-step.active .step-marker {
  border-color: var(--brass);
}

.timeline-step.active .step-marker::before {
  color: var(--brass);
}

.step-label {
  display: block;
  font-family: var(--font-head);
  text-transform: uppercase;
  font-size: 0.9rem;
  margin-bottom: 4px;
  letter-spacing: 0.03em;
}

.step-desc {
  display: block;
  font-size: 0.82rem;
  color: var(--light-dim);
  max-width: 140px;
  margin: 0 auto;
  line-height: 1.35;
}

@media (max-width: 768px) {
  .timeline-steps {
    flex-direction: column;
    gap: 24px;
  }

  .timeline-fill {
    left: 17px;
    top: 0;
    width: 2px;
    height: 0%;
    transition-property: height;
  }

  .timeline-step {
    text-align: left;
    padding-left: 50px;
  }

  .step-marker {
    position: absolute;
    left: 0;
    top: 0;
    margin: 0;
  }
}

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 32px;
}

.project-card {
  background: var(--iron-700);
  border: 1px solid var(--iron-600);
  overflow: hidden;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

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

.project-media {
  position: relative;
  height: 240px;
  background: var(--iron-800);
  overflow: hidden;
}

.project-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.3) contrast(1.05);
  transition: transform 0.4s ease, filter 0.4s ease;
}

.project-card:hover .project-media img {
  transform: scale(1.04);
  filter: grayscale(0) contrast(1.05);
}

.project-body {
  padding: 24px;
}

.project-category {
  display: block;
  font-family: var(--font-head);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--brass);
  margin-bottom: 6px;
}

.project-title {
  font-family: var(--font-head);
  font-size: 1.35rem;
  text-transform: uppercase;
  margin: 0 0 10px;
  color: var(--light);
}

.project-desc {
  color: var(--light-dim);
  font-size: 0.92rem;
  margin: 0 0 16px;
  line-height: 1.55;
}

.project-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.spec-tag {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--iron-600);
  color: var(--light-dim);
  padding: 4px 10px;
  border-left: 2px solid var(--brass);
}

.process-stages {
  display: flex;
  gap: 10px;
}

.stage-dot {
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--iron-600);
  transition: background 0.3s ease;
}

.stage-dot.complete {
  background: var(--brass);
}

/* Enrollment */
.enrollment {
  background: var(--iron-800);
  position: relative;
}

.enrollment-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 120px 24px;
}

.enrollment-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 72px;
  align-items: start;
}

.enrollment-form {
  display: grid;
  gap: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--light-dim);
  font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
  background: var(--iron-700);
  border: 1px solid var(--iron-600);
  color: var(--light);
  padding: 14px 16px;
  font-family: var(--font-body);
  font-size: 1rem;
  border-radius: 0;
  transition: border-color 0.2s ease;
  -webkit-appearance: none;
  appearance: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--brass);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--graphite);
}

.form-group.invalid input,
.form-group.invalid select,
.form-group.invalid textarea {
  border-color: var(--danger);
}

.error-message {
  color: var(--danger);
  font-size: 0.85rem;
  display: none;
}

.form-group.invalid .error-message {
  display: block;
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.submit-btn {
  justify-self: start;
  padding: 16px 36px;
  background: var(--brass);
  color: var(--iron-950);
  border: none;
  font-family: var(--font-head);
  text-transform: uppercase;
  font-size: 1rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: filter 0.2s ease, transform 0.2s ease;
  font-weight: 600;
}

.submit-btn:hover {
  filter: brightness(1.15);
  transform: translateY(-1px);
}

.submit-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.contact-info {
  border-left: 1px solid var(--iron-700);
  padding-left: 40px;
}

.contact-info h3 {
  font-family: var(--font-head);
  text-transform: uppercase;
  font-size: 1.1rem;
  margin: 0 0 24px;
  color: var(--light);
  letter-spacing: 0.04em;
}

.contact-block {
  margin-bottom: 24px;
}

.contact-block dt {
  font-size: 0.72rem;
  text-transform: uppercase;
  color: var(--light-dim);
  letter-spacing: 0.08em;
  margin-bottom: 4px;
  font-weight: 500;
}

.contact-block dd {
  margin: 0;
  color: var(--light);
  font-size: 1rem;
  line-height: 1.5;
}

.contact-block a {
  color: var(--brass);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.contact-block a:hover,
.contact-block a:focus {
  border-bottom-color: var(--brass);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--iron-700);
  padding: 40px 24px;
  text-align: center;
  color: var(--light-dim);
  font-size: 0.88rem;
}

.footer-line {
  margin-top: 6px;
  opacity: 0.7;
}

/* Reveal animations */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1), transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 1024px) {
  .enrollment-content {
    gap: 48px;
  }

  .about {
    gap: 48px;
    padding: 80px 24px;
  }
}

@media (max-width: 768px) {
  .about,
  .enrollment-content {
    grid-template-columns: 1fr;
  }

  .contact-info {
    border-left: none;
    border-top: 1px solid var(--iron-700);
    padding-left: 0;
    padding-top: 32px;
  }

  .machine-floor-inner,
  .skills-inner,
  .enrollment-inner {
    padding: 80px 24px;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }
}