/* =====================================================================
   Velocity Prints — Custom 3D Printing
   Stylesheet (shared by index.html and thanks.html)
   ===================================================================== */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0A0A0A;
  --surface: #111111;
  --card: #181818;
  --border: #242424;
  --accent: #FF5C1A;
  --accent-glow: rgba(255, 92, 26, 0.12);
  --text: #F0F0F0;
  --text-muted: #6B6B6B;
  --radius: 10px;
  --maxw: 1100px;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

/* Accessible focus ring */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Visually-hidden helper (skip link, sr-only labels) */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: absolute;
  left: 12px; top: -48px;
  z-index: 200;
  background: var(--accent);
  color: #fff;
  padding: 10px 18px;
  border-radius: 6px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  text-decoration: none;
  transition: top 0.18s;
}
.skip-link:focus { top: 12px; }

/* ─── NAV ─── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 18px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(10,10,10,0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
}
.nav-logo span { color: var(--accent); }

.nav-right { display: flex; align-items: center; gap: 28px; }

.nav-links { display: flex; gap: 28px; }
.nav-links a {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--text); }

.nav-cta {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 9px 22px;
  border-radius: 6px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.15s;
}
.nav-cta:hover { opacity: 0.85; }

/* Hamburger (mobile only) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px; height: 38px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  padding: 0 9px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ─── HERO ─── */
.hero-wrap { position: relative; overflow: hidden; }

/* Signature element: a print-head sweep line that reveals the hero */
.print-sweep {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--accent) 40%, var(--accent) 60%, transparent 100%);
  transform-origin: left;
  animation: sweep 1.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}
@keyframes sweep {
  0%   { transform: scaleX(0) translateX(0); opacity: 1; }
  70%  { transform: scaleX(1) translateX(0); opacity: 1; }
  100% { transform: scaleX(1) translateX(0); opacity: 0; }
}

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 140px 48px 100px;
  max-width: var(--maxw);
  margin: 0 auto;
}

.hero-eyebrow {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 22px;
  opacity: 0;
  animation: fadeUp 0.5s 0.9s forwards;
}

.hero-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(2.8rem, 6vw, 4.8rem);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 26px;
  opacity: 0;
  animation: fadeUp 0.5s 1.1s forwards;
}
.hero-title em { font-style: normal; color: var(--accent); }

.hero-sub {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 520px;
  margin-bottom: 44px;
  line-height: 1.75;
  opacity: 0;
  animation: fadeUp 0.5s 1.3s forwards;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.5s 1.5s forwards;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 15px 34px;
  border-radius: 8px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: opacity 0.15s, transform 0.15s;
}
.btn-primary:hover { opacity: 0.88; transform: translateY(-1px); }

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 15px 34px;
  border-radius: 8px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 500;
  font-size: 1rem;
  text-decoration: none;
  display: inline-block;
  transition: border-color 0.15s, color 0.15s;
}
.btn-ghost:hover { border-color: #555; color: var(--text); }

/* ─── SHARED SECTION ─── */
hr.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0 48px;
}

.section {
  padding: 90px 48px;
  max-width: var(--maxw);
  margin: 0 auto;
}

.section-eyebrow {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.section-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.7rem, 3.5vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.15;
  color: var(--text);
  margin-bottom: 14px;
}

.section-sub {
  color: var(--text-muted);
  max-width: 460px;
  margin-bottom: 52px;
}

/* ─── MATERIALS ─── */
.materials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.mat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color 0.2s, transform 0.2s;
}
.mat-card:hover { border-color: var(--accent); transform: translateY(-2px); }

.mat-icon { font-size: 1.8rem; margin-bottom: 14px; }

.mat-name {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text);
  margin-bottom: 8px;
}

.mat-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.mat-badge {
  display: inline-block;
  margin-top: 14px;
  font-size: 0.68rem;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 3px 10px;
  border-radius: 4px;
}

/* ─── HOW IT WORKS ─── */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.step-num {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 20px;
}

.step:first-child .step-num {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.step-title {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text);
  margin-bottom: 8px;
}

.step-body {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ─── QUOTE FORM SECTION ─── */
#quote {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 90px 48px;
}

.quote-inner { max-width: 780px; margin: 0 auto; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.form-col { display: flex; flex-direction: column; }

label {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 7px;
}
.req { color: var(--accent); margin-left: 2px; }

input[type="text"],
input[type="email"],
input[type="number"],
input[type="url"],
select,
textarea {
  width: 100%;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
  -webkit-appearance: none;
}
input::placeholder, textarea::placeholder { color: var(--text-muted); opacity: 0.45; }
input:focus, select:focus, textarea:focus { border-color: var(--accent); }
select { cursor: pointer; }
select option { background: #1a1a1a; }

textarea { resize: vertical; min-height: 110px; }

.mb { margin-bottom: 16px; }

/* Honeypot — must stay invisible to humans */
.hp-field {
  position: absolute !important;
  left: -9999px !important;
  width: 1px; height: 1px;
  overflow: hidden;
}

/* File upload drop zone */
.drop-zone {
  position: relative;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 36px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  margin-bottom: 16px;
}
.drop-zone:hover, .drop-zone.over {
  border-color: var(--accent);
  background: var(--accent-glow);
}
.drop-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}
.drop-icon { font-size: 2rem; margin-bottom: 10px; }
.drop-label {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 5px;
}
.drop-sub { font-size: 0.8rem; color: var(--text-muted); }
.file-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.file-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-glow);
  border: 1px solid rgba(255,92,26,0.25);
  color: var(--accent);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 500;
}
.file-tag .size { color: var(--text-muted); font-weight: 400; }

/* File size warning */
.file-warning {
  display: none;
  align-items: flex-start;
  gap: 10px;
  background: rgba(255,92,26,0.08);
  border: 1px solid rgba(255,92,26,0.35);
  color: var(--text);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 16px;
  font-size: 0.83rem;
  line-height: 1.5;
}
.file-warning.show { display: flex; }

/* Helper callout */
.callout {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: rgba(255,92,26,0.06);
  border: 1px solid rgba(255,92,26,0.18);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 16px;
}
.callout-icon { font-size: 1rem; flex-shrink: 0; margin-top: 1px; }
.callout-text { font-size: 0.83rem; color: var(--text-muted); line-height: 1.5; }
.callout-text strong { color: var(--text); font-weight: 500; }

/* Submit row */
.submit-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 28px;
}
.submit-note { font-size: 0.82rem; color: var(--text-muted); }

.btn-submit {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 14px 40px;
  border-radius: 8px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.15s;
}
.btn-submit:hover { opacity: 0.88; transform: translateY(-1px); }
.btn-submit:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* ─── FOOTER ─── */
footer {
  padding: 44px 48px;
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  border-top: 1px solid var(--border);
}
.footer-logo {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
}
.footer-logo span { color: var(--accent); }
.footer-links { display: flex; gap: 24px; flex-wrap: wrap; }
.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.15s;
}
.footer-links a:hover { color: var(--text); }
.footer-copy { font-size: 0.8rem; color: var(--text-muted); width: 100%; }

/* ─── TECHNOLOGIES ─── */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.tech-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s;
}
.tech-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--t-color, var(--accent));
}
.tech-card[data-tech="fdm"]   { --t-color: #FF5C1A; }
.tech-card[data-tech="resin"] { --t-color: #7C63E8; }
.tech-card[data-tech="metal"] { --t-color: #A0A8B8; }
.tech-card:hover { border-color: var(--t-color, var(--accent)); transform: translateY(-2px); }

.tech-label {
  font-size: 0.68rem;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--t-color, var(--accent));
  margin-bottom: 14px;
}

.tech-icon { font-size: 2rem; margin-bottom: 16px; }

.tech-name {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  margin-bottom: 10px;
  letter-spacing: -0.02em;
}

.tech-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 22px;
}

.tech-specs {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.tech-specs li {
  font-size: 0.8rem;
  color: var(--text-muted);
  padding-left: 16px;
  position: relative;
  line-height: 1.4;
}
.tech-specs li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--t-color, var(--accent));
  font-size: 0.72rem;
  top: 1px;
}

/* ─── FILAMENT LIBRARY ─── */
.fil-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}
.fil-tab {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.fil-tab:hover { border-color: #555; color: var(--text); }
.fil-tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.filament-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 14px;
}

.fil-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 18px;
  transition: border-color 0.2s, transform 0.2s;
}
.fil-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.fil-card.hidden { display: none; }

.fil-swatches {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.fil-swatch {
  width: 18px; height: 18px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.1);
  flex-shrink: 0;
}

.fil-name {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 5px;
}
.fil-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.45;
  margin-bottom: 12px;
}
.fil-props { display: flex; flex-wrap: wrap; gap: 5px; }
.fil-prop {
  font-size: 0.63rem;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 3px;
  background: rgba(255,255,255,0.05);
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ─── METAL PRINTING ─── */
.metal-section {
  background: #0D0D0D;
  border-top: 1px solid #1e1e1e;
  border-bottom: 1px solid #1e1e1e;
  padding: 90px 48px;
  position: relative;
  overflow: hidden;
}
.metal-section::before {
  content: '';
  position: absolute;
  top: -100px; right: -100px;
  width: 400px; height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(160,168,184,0.06) 0%, transparent 70%);
  pointer-events: none;
}
.metal-inner { max-width: var(--maxw); margin: 0 auto; }

.metal-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: start;
}

.metal-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.68rem;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #A0A8B8;
  background: rgba(160,168,184,0.08);
  border: 1px solid rgba(160,168,184,0.22);
  padding: 5px 12px;
  border-radius: 4px;
  margin-bottom: 20px;
}

.metal-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.1;
  color: var(--text);
  margin-bottom: 16px;
}

.metal-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 28px;
}

.metal-note {
  font-size: 0.8rem;
  color: #777;
  line-height: 1.55;
  padding-top: 18px;
  border-top: 1px solid #1e1e1e;
}

.metal-alloys {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.alloy-card {
  background: #141414;
  border: 1px solid #242424;
  border-radius: 8px;
  padding: 20px 18px;
  transition: border-color 0.2s;
}
.alloy-card:hover { border-color: #A0A8B8; }

.alloy-sym {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #A0A8B8;
  margin-bottom: 6px;
}
.alloy-name {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text);
  margin-bottom: 6px;
}
.alloy-use { font-size: 0.77rem; color: var(--text-muted); line-height: 1.45; }

/* ─── THANK-YOU PAGE ─── */
.thanks-wrap {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  max-width: 620px;
  margin: 0 auto;
}
.thanks-icon {
  font-size: 3.4rem;
  margin-bottom: 22px;
  animation: fadeUp 0.5s 0.1s both;
}
.thanks-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text);
  margin-bottom: 16px;
  animation: fadeUp 0.5s 0.2s both;
}
.thanks-body {
  color: var(--text-muted);
  font-size: 1.02rem;
  line-height: 1.7;
  margin-bottom: 36px;
  animation: fadeUp 0.5s 0.3s both;
}
.thanks-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  width: 100%;
  margin-bottom: 40px;
  text-align: left;
  animation: fadeUp 0.5s 0.4s both;
}
.thanks-step {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 18px;
}
.thanks-step .n {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  color: var(--accent);
  font-size: 0.9rem;
  margin-bottom: 8px;
}
.thanks-step p { font-size: 0.84rem; color: var(--text-muted); line-height: 1.5; }
.thanks-actions { animation: fadeUp 0.5s 0.5s both; }

/* ─── RESPONSIVE ─── */
@media (max-width: 900px) {
  .tech-grid { grid-template-columns: 1fr; }
  .metal-layout { grid-template-columns: 1fr; gap: 44px; }
  .nav-toggle { display: flex; }
  .nav-right { gap: 14px; }
  .nav-links {
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(10,10,10,0.97);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    padding: 8px 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }
  .nav-links.open { max-height: 320px; }
  .nav-links a {
    padding: 14px 24px;
    font-size: 0.95rem;
    border-top: 1px solid var(--border);
  }
  .nav-links a:first-child { border-top: none; }
}
@media (max-width: 700px) {
  nav { padding: 16px 20px; }
  .hero { padding: 110px 20px 80px; }
  hr.divider { margin: 0 20px; }
  .section { padding: 70px 20px; }
  .materials-grid { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr; gap: 32px; }
  #quote { padding: 70px 20px; }
  .form-row { grid-template-columns: 1fr; }
  footer { flex-direction: column; align-items: flex-start; padding: 32px 20px; }
  .metal-section { padding: 70px 20px; }
  .metal-alloys { grid-template-columns: 1fr; }
  .thanks-steps { grid-template-columns: 1fr; }
}
@media (max-width: 420px) {
  .materials-grid { grid-template-columns: 1fr; }
}

/* Respect reduced-motion preferences */
@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;
  }
  .hero-eyebrow, .hero-title, .hero-sub, .hero-actions,
  .thanks-icon, .thanks-title, .thanks-body, .thanks-steps, .thanks-actions { opacity: 1; }
  .print-sweep { display: none; }
}