/* Fonts */
@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=IBM+Plex+Sans:wght@400;500;600&display=swap');

/* Variables */
:root {
  --bg: #0f0f0f;
  --bg-2: #171717;
  --bg-3: #1e1e1e;
  --fg: #f0ede6;
  --fg-2: #a8a49c;
  --fg-3: #6b6860;
  --accent: #e8870f;
  --accent-dark: #c4720d;
  --amber: #f5a623;
  --surface: #232323;
  --border: #2e2e2e;
}

/* Reset */
* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3 {
  font-family: 'DM Serif Display', Georgia, serif;
  font-weight: 400;
  line-height: 1.15;
}

h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.8rem); }
h3 { font-size: 1.1rem; font-family: 'IBM Plex Sans', sans-serif; font-weight: 600; letter-spacing: 0.02em; }

em { font-style: italic; color: var(--accent); }

a { color: var(--fg); text-decoration: none; }
a:hover { color: var(--accent); }

/* Nav */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 15, 15, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: 'DM Serif Display', serif;
  font-size: 1.4rem;
  letter-spacing: -0.02em;
}

.logo-accent { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--fg-2);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--accent); }

/* Hero */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 5rem 2rem 3rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 4rem;
  align-items: start;
}

.hero-eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero-headline {
  margin-bottom: 1.25rem;
  color: var(--fg);
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--fg-2);
  max-width: 520px;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.hero-image-wrap {
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.hero-img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  display: block;
}

.hero-aside {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding-top: 2rem;
}

.hero-callout {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  padding: 1.25rem 1.5rem;
}

.hero-callout--alt {
  border-left-color: var(--fg-3);
}

.callout-tag {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.callout-desc {
  font-size: 0.9rem;
  color: var(--fg-2);
  line-height: 1.5;
}

/* Stats */
.stats-row {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 2rem;
  gap: 0;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  padding: 0 3rem;
}

.stat-num {
  font-family: 'DM Serif Display', serif;
  font-size: 2.2rem;
  color: var(--fg);
  line-height: 1;
}

.stat-label {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* Section shared */
.section-eyebrow {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.section-headline {
  margin-bottom: 2rem;
}

/* How it works */
.how-it-works {
  max-width: 1200px;
  margin: 0 auto;
  padding: 5rem 2rem;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin-top: 1rem;
}

.step {
  padding: 2.5rem 2.5rem 2.5rem 0;
  border-right: 1px solid var(--border);
}

.step:last-child { border-right: none; }

.step-num {
  font-family: 'DM Serif Display', serif;
  font-size: 3rem;
  color: var(--border);
  display: block;
  margin-bottom: 1rem;
}

.step h3 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.step p {
  font-size: 0.9rem;
  color: var(--fg-2);
  line-height: 1.65;
  padding-right: 2rem;
}

/* Panels */
.panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
}

.panel--dark { background: var(--bg-2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.panel--light { background: var(--bg-3); }

.panel-content { padding: 5rem 4rem; }
.panel-body { color: var(--fg-2); line-height: 1.7; margin-bottom: 1.5rem; font-size: 0.95rem; }

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.feature-list li {
  font-size: 0.88rem;
  color: var(--fg-2);
  padding-left: 1rem;
  border-left: 2px solid var(--border);
  line-height: 1.5;
}

.feature-list strong { color: var(--fg); }

/* Seller cards (mock listings) */
.panel-visual {
  padding: 3rem 4rem 3rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.panel-visual--left { padding: 3rem 0 3rem 4rem; }

.seller-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  position: relative;
}

.seller-card--dimmed { opacity: 0.5; }

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.card-badge {
  background: var(--accent);
  color: #000;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
}

.card-id {
  font-size: 0.72rem;
  color: var(--fg-3);
  font-family: 'IBM Plex Sans', monospace;
}

.card-specs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.spec { display: flex; flex-direction: column; gap: 0.15rem; }
.spec-label { font-size: 0.68rem; color: var(--fg-3); text-transform: uppercase; letter-spacing: 0.06em; font-weight: 500; }
.spec-val { font-size: 0.9rem; color: var(--fg); font-weight: 500; }

.card-meta { display: flex; justify-content: space-between; align-items: center; border-top: 1px solid var(--border); padding-top: 0.75rem; }
.card-location { font-size: 0.8rem; color: var(--fg-2); }
.card-price { font-family: 'DM Serif Display', serif; font-size: 1.2rem; color: var(--accent); }

/* Filter widget */
.filter-widget {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
}

.filter-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--fg-2);
  margin-bottom: 1.25rem;
}

.filter-row {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.filter-group { display: flex; flex-direction: column; gap: 0.5rem; }

.filter-group label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
}

.filter-chips { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.chip {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.3rem 0.65rem;
  font-size: 0.78rem;
  color: var(--fg-2);
  cursor: default;
}

.chip--active {
  background: var(--accent);
  border-color: var(--accent);
  color: #000;
  font-weight: 600;
}

/* Materials */
.materials {
  max-width: 1200px;
  margin: 0 auto;
  padding: 5rem 2rem;
  border-top: 1px solid var(--border);
}

.materials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin-top: 1.5rem;
}

.material-card {
  background: var(--bg-2);
  padding: 2rem;
  transition: background 0.2s;
}

.material-card:hover { background: var(--bg-3); }

.material-icon {
  color: var(--accent);
  margin-bottom: 1rem;
}

.material-card h3 {
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
  color: var(--fg);
}

.material-card p {
  font-size: 0.82rem;
  color: var(--fg-2);
  line-height: 1.6;
}

/* Closing */
.closing {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  padding: 6rem 2rem;
  text-align: center;
}

.closing-inner { max-width: 680px; margin: 0 auto; }

.closing-headline {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  margin-bottom: 1.25rem;
}

.closing-body {
  font-size: 1rem;
  color: var(--fg-2);
  line-height: 1.75;
}

/* Footer */
.site-footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 4rem 2rem 2rem;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border);
}

.footer-logo {
  font-family: 'DM Serif Display', serif;
  font-size: 1.3rem;
  display: block;
  margin-bottom: 0.75rem;
}

.footer-brand p {
  font-size: 0.82rem;
  color: var(--fg-3);
  line-height: 1.6;
  max-width: 320px;
}

.footer-cols {
  display: flex;
  gap: 4rem;
}

.footer-col { display: flex; flex-direction: column; gap: 0.6rem; }
.footer-col-title {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 0.25rem;
}

.footer-col a {
  font-size: 0.85rem;
  color: var(--fg-2);
  transition: color 0.2s;
}

.footer-col a:hover { color: var(--accent); }

.footer-bottom {
  max-width: 1200px;
  margin: 1.5rem auto 0;
  font-size: 0.78rem;
  color: var(--fg-3);
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2rem; }
  .hero-aside { padding-top: 0; }
  .steps-grid { grid-template-columns: 1fr; }
  .step { border-right: none; border-bottom: 1px solid var(--border); padding-right: 0; }
  .step:last-child { border-bottom: none; }
  .panel { grid-template-columns: 1fr; }
  .panel-content { padding: 3rem 2rem; }
  .panel-visual { padding: 0 2rem 3rem; }
  .panel-visual--left { padding: 0 2rem 3rem; }
  .materials-grid { grid-template-columns: 1fr 1fr; }
  .stats-row { flex-wrap: wrap; gap: 1.5rem; justify-content: flex-start; }
  .stat { padding: 0 1.5rem; }
  .stat-divider { display: none; }
  .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 600px) {
  .nav-links { display: none; }
  .materials-grid { grid-template-columns: 1fr; }
  .footer-cols { gap: 2rem; }
  .hero { padding: 3rem 1.25rem 2rem; }
  .how-it-works, .materials { padding: 3rem 1.25rem; }
  .panel-content { padding: 2.5rem 1.25rem; }
  .panel-visual, .panel-visual--left { padding: 0 1.25rem 2.5rem; }
}