/* ==========================================================================
   Phi Atlas Advisory - Foundation (base.css)
   Strictly Foundation: Tokens, Typography, Layout, Navigation, FREC Footer
   ========================================================================== */

:root {
  --color-gold: #D4AF37;
  --color-ochre: #9C784A;

  --bg-canvas: #FAFAF9;
  --bg-surface: #FFFFFF;
  --border-subtle: #E7E5E4;
  --border-card: #D6D3D1;
  --text-primary: #1C1917;
  --text-secondary: #44403C;
  --text-muted: #78716C;
  --logo-primary: #1C1917;
  --btn-outline-border: #D6D3D1;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-canvas: #131110;
    --bg-surface: #1C1917;
    --border-subtle: #292524;
    --border-card: #44403C;
    --text-primary: #F5F5F4;
    --text-secondary: #D6D3D1;
    --text-muted: #A8A29E;
    --logo-primary: #FFFFFF;
    --btn-outline-border: #44403C;
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 24px 40px;
  flex: 1;
  width: 100%;
}

/* Page Section Titles & Subheadings */
.page-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.lead-text {
  font-size: 17px;
  color: var(--text-secondary);
  margin-bottom: 36px;
  font-weight: 400;
  line-height: 1.65;
}

.lead-text strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* Header & Line 1 Navigation */
header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.header-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.brand-identity {
  display: flex;
  align-items: center;
  gap: 16px;
  text-decoration: none;
}

.brand-mark {
  width: 52px;
  height: 52px;
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 1.8px;
  color: var(--text-primary);
  text-transform: uppercase;
  line-height: 1.15;
}

.brand-subtitle {
  font-size: 10.5px;
  letter-spacing: 1.8px;
  color: var(--color-gold);
  text-transform: uppercase;
  font-weight: 600;
  margin-top: 4px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-gold);
}

.broker-header-lockup {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
  border-left: 1px solid var(--border-subtle);
  padding-left: 20px;
}

.broker-header-label {
  font-size: 9px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 600;
}

.broker-logo-header {
  height: 32px;
  width: auto;
  display: block;
  object-fit: contain;
}

@media (prefers-color-scheme: dark) {
  .broker-logo-header {
    filter: brightness(1.15);
  }
}

/* Line 2: Contextual Two-Tier Sub-Navigation */
.subnav-bar {
  display: flex;
  align-items: center;
  gap: 28px;
  border-bottom: 1px solid var(--border-subtle);
  margin-top: -16px;
  margin-bottom: 36px;
  padding-bottom: 12px;
  overflow-x: auto;
}

.subnav-link {
  font-size: 12.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.9px;
  color: var(--text-muted);
  text-decoration: none;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.subnav-link:hover {
  color: var(--text-primary);
}

.subnav-link.active {
  color: var(--color-gold);
  border-bottom-color: var(--color-gold);
}

/* Shared Reusable Surfaces */
.surface-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.02);
}

.surface-card-accent {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-left: 4px solid var(--color-gold);
  border-radius: 0 10px 10px 0;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
}

/* Button & Action Primitives */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-decoration: none;
  border-radius: 4px;
  transition: all 0.2s ease;
}

.btn-gold {
  background-color: var(--color-gold);
  color: #1C1917;
}

.btn-gold:hover {
  background-color: #E2BC44;
  transform: translateY(-1px);
}

.btn-outline {
  border: 1px solid var(--btn-outline-border);
  color: var(--text-primary);
  background-color: var(--bg-surface);
}

.btn-outline:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
  transform: translateY(-1px);
}

.btn-block {
  width: 100%;
}

.action-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
  margin-bottom: 48px;
}

/* Section Dividers */
.section-bridge {
  margin-top: 48px;
  margin-bottom: 48px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 36px;
}

.section-bridge-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.section-bridge-desc {
  font-size: 14.5px;
  color: var(--text-secondary);
}

/* FREC Statutory Footer */
footer {
  border-top: 1px solid var(--border-subtle);
  padding-top: 32px;
  font-size: 12.5px;
  color: var(--text-muted);
  line-height: 1.65;
}

.footer-brand-strip {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 20px;
}

.footer-broker-logo {
  height: 38px;
  width: auto;
  display: block;
}

.footer-brokerage-title {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-compliance-text {
  font-size: 11.5px;
  color: var(--text-muted);
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--border-subtle);
}

.footer-links a {
  color: var(--color-gold);
  text-decoration: none;
}

.footer-links a:hover {
  text-decoration: underline;
}

@media (max-width: 640px) {
  .header-nav {
    flex-direction: column;
    align-items: flex-start;
  }
  .nav-links {
    width: 100%;
    justify-content: flex-start;
    gap: 16px;
    padding: 8px 0;
  }
  .broker-header-lockup {
    border-left: none;
    padding-left: 0;
    align-items: flex-start;
  }
  .action-links {
    flex-direction: column;
  }
  .btn {
    width: 100%;
  }
}