@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Serif:wght@400;500;700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --paper: #13110F;
  --paper-alt: #1C1A17;
  --paper-deep: #0A0907;
  --card-hi: #23211E;
  --ink: #F3F1EE;
  --ink2: #B9B7B4;
  --ink3: #73716E;
  --rule: #34332F;
  --rule-soft: #262421;
  --amber: #FAB72A;
  --amber-deep: #DA950B;
  --amber-soft: #422800;
  --amber-ink: #13110F;
  --ok: #63D18F;
  --warn: #FFB147;
  --whatsapp: #25D366;
  --sidebar-width: 260px;
}

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

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

body {
  background: var(--paper);
  color: var(--ink);
  font-family: 'Inter', system-ui, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
}

/* ── Layout ───────────────────────────────────────────────────────────────── */

.layout {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar ──────────────────────────────────────────────────────────────── */

.sidebar {
  width: var(--sidebar-width);
  background: var(--paper-alt);
  border-right: 1px solid var(--rule);
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: transform 0.25s ease;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 24px 20px 20px;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
}

.sidebar-logo img {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.sidebar-logo-text {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.3px;
}

.sidebar-logo-text span {
  color: var(--amber);
}

.nav-section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--ink3);
  padding: 20px 20px 8px;
}

nav ul {
  list-style: none;
  padding: 0 0 20px;
}

nav ul li a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  color: var(--ink2);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  border-left: 2px solid transparent;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}

nav ul li a:hover {
  color: var(--ink);
  background: var(--card-hi);
}

nav ul li a.active {
  color: var(--amber);
  border-left-color: var(--amber);
  background: var(--amber-soft);
}

nav ul li a .nav-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  opacity: 0.7;
}

nav ul li a.active .nav-icon {
  opacity: 1;
}

/* ── Main content ─────────────────────────────────────────────────────────── */

.main {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-width: 0;
}

.topbar {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  height: 56px;
  background: var(--paper-alt);
  border-bottom: 1px solid var(--rule);
  position: sticky;
  top: 0;
  z-index: 50;
}

.topbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.topbar-logo img {
  width: 28px;
  height: 28px;
}

.topbar-logo-text {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.topbar-logo-text span {
  color: var(--amber);
}

.hamburger {
  background: none;
  border: 1px solid var(--rule);
  color: var(--ink2);
  cursor: pointer;
  padding: 6px 10px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink2);
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 90;
}

.page {
  max-width: 820px;
  padding: 56px 48px 80px;
}

/* ── Typography ───────────────────────────────────────────────────────────── */

.eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--ink3);
  display: block;
  margin-bottom: 8px;
}

h1 {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 36px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.6px;
  line-height: 1.1;
  margin-bottom: 16px;
}

h2 {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 24px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.3px;
  line-height: 1.15;
  margin-top: 52px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule-soft);
}

h3 {
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-top: 28px;
  margin-bottom: 10px;
}

p {
  color: var(--ink2);
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 16px;
}

p strong {
  color: var(--ink);
  font-weight: 600;
}

a {
  color: var(--amber);
  text-decoration: none;
}

a:hover {
  color: var(--amber-deep);
  text-decoration: underline;
}

ul, ol {
  padding-left: 20px;
  margin-bottom: 16px;
}

li {
  color: var(--ink2);
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 6px;
}

li strong {
  color: var(--ink);
  font-weight: 600;
}

hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 40px 0;
}

/* ── Hero ─────────────────────────────────────────────────────────────────── */

.hero {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 52px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--rule-soft);
}

.hero-logo {
  display: flex;
  align-items: center;
  gap: 16px;
}

.hero-logo img {
  width: 56px;
  height: 56px;
}

.hero-logo-wordmark {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 28px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.4px;
}

.hero-logo-wordmark span {
  color: var(--amber);
}

.hero h1 {
  font-size: 42px;
  margin-bottom: 12px;
}

.hero p {
  font-size: 17px;
  max-width: 560px;
}

/* ── Feature cards grid ───────────────────────────────────────────────────── */

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  margin-bottom: 48px;
}

.feature-card {
  background: var(--paper-alt);
  padding: 28px 24px;
  text-decoration: none;
  display: block;
  transition: background 0.15s;
}

.feature-card:hover {
  background: var(--card-hi);
  text-decoration: none;
}

.feature-card-icon {
  width: 32px;
  height: 32px;
  margin-bottom: 14px;
  color: var(--amber);
}

.feature-card h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 8px;
}

.feature-card p {
  font-size: 13px;
  color: var(--ink3);
  margin: 0;
  line-height: 1.5;
}

/* ── Info box ─────────────────────────────────────────────────────────────── */

.info-box {
  background: var(--paper-alt);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--amber);
  padding: 16px 20px;
  margin: 20px 0;
}

.info-box p {
  margin: 0;
  font-size: 14px;
}

.info-box.ok {
  border-left-color: var(--ok);
}

.info-box.warn {
  border-left-color: var(--warn);
}

.info-box.whatsapp {
  border-left-color: var(--whatsapp);
}

/* ── Code blocks ──────────────────────────────────────────────────────────── */

code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  background: var(--paper-alt);
  color: var(--amber);
  padding: 2px 6px;
  border: 1px solid var(--rule);
}

pre {
  background: var(--paper-alt);
  border: 1px solid var(--rule);
  padding: 20px 24px;
  overflow-x: auto;
  margin: 16px 0 24px;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--ink2);
  font-size: 13px;
  line-height: 1.6;
}

/* ── Status badges ────────────────────────────────────────────────────────── */

.badge {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 3px 8px;
  border: 1px solid currentColor;
}

.badge-amber { color: var(--amber); }
.badge-ok { color: var(--ok); }
.badge-warn { color: var(--warn); }
.badge-whatsapp { color: var(--whatsapp); }
.badge-buyer { color: #71BFFF; }
.badge-seller { color: #F47B74; }
.badge-renter { color: #73CE95; }
.badge-landlord { color: #B88FE6; }

/* ── Step diagrams ────────────────────────────────────────────────────────── */

.step-diagram {
  width: 100%;
  max-width: 720px;
  display: block;
  margin: 24px 0 32px;
  overflow: visible;
}

/* ── Section dividers ─────────────────────────────────────────────────────── */

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--amber-soft);
  border: 1px solid var(--amber);
  padding: 4px 12px;
  margin-bottom: 16px;
  margin-top: 52px;
}

.section-tag span {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--amber);
}

/* ── Page header ──────────────────────────────────────────────────────────── */

.page-header {
  margin-bottom: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--rule-soft);
}

.page-header h1 {
  margin-bottom: 10px;
}

.page-header p {
  font-size: 16px;
  color: var(--ink2);
  margin: 0;
  max-width: 540px;
}

/* ── Responsive ───────────────────────────────────────────────────────────── */

@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-overlay.visible {
    display: block;
  }

  .topbar {
    display: flex;
  }

  .main {
    margin-left: 0;
  }

  .page {
    padding: 32px 24px 60px;
  }

  h1 {
    font-size: 28px;
  }

  .hero h1 {
    font-size: 30px;
  }

  h2 {
    font-size: 20px;
  }

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

  .step-diagram {
    overflow-x: auto;
  }
}

@media (max-width: 560px) {
  .page {
    padding: 24px 16px 48px;
  }
}