/* ============================================================
   Fargo Patent Law — Shared Design System
   Apple-inspired. Deep Heritage Blue authority.
   ============================================================ */

/* ── Design Tokens ─────────────────────────────────────────── */
:root {
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display",
               "Helvetica Neue", Arial, sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;

  --size-hero:    clamp(48px, 5.5vw + 0.5rem, 80px);
  --size-h2:      clamp(32px, 3.5vw + 0.5rem, 56px);
  --size-h3:      clamp(22px, 2.2vw + 0.4rem, 36px);
  --size-body-lg: 21px;
  --size-body:    17px;
  --size-small:   14px;
  --size-eyebrow: 12px;

  /* Colors */
  --color-bg:         #ffffff;
  --color-bg-alt:     #f5f5f7;
  --color-dark:       #1d1d1f;
  --color-darker:     #000000;
  --color-text:       #1d1d1f;
  --color-muted:      #6e6e73;
  --color-subtle:     #86868b;
  --color-border:     #d2d2d7;
  --color-text-on-dark: #f5f5f7;
  --color-muted-on-dark: #a1a1a6;

  --color-accent:       #1F4E79;
  --color-accent-hover: #163a5c;
  --color-accent-light: #e8f0f8;

  /* Spacing (8pt grid) */
  --space-xs:  8px;
  --space-sm:  16px;
  --space-md:  24px;
  --space-lg:  48px;
  --space-xl:  80px;
  --space-xxl: 120px;
  --section-pad: var(--space-xxl);
  --section-pad-mobile: 64px;

  /* Layout */
  --max-content: 980px;
  --max-wide:    1200px;
  --side-pad:    40px;
  --side-pad-mobile: 20px;

  /* Radii */
  --radius-sm:   8px;
  --radius-md:   12px;
  --radius-card: 18px;
  --radius-pill: 980px;

  /* Nav */
  --nav-height: 52px;

  /* Shadows */
  --shadow-card: 0 2px 16px rgba(0, 0, 0, 0.08);
  --shadow-card-hover: 0 6px 32px rgba(0, 0, 0, 0.13);

  /* Transitions */
  --ease-out: cubic-bezier(0.25, 0.1, 0.25, 1);
  --transition-fast: 200ms var(--ease-out);
  --transition-med:  300ms var(--ease-out);
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  font-size: var(--size-body);
  line-height: 1.52;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { list-style: none; }

/* ── Layout Helpers ─────────────────────────────────────────── */
.container {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 0 var(--side-pad);
}
.container--wide {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 0 var(--side-pad);
}
.section {
  padding: var(--section-pad) 0;
}
.section--alt {
  background: var(--color-bg-alt);
}
.section--dark {
  background: var(--color-dark);
  color: var(--color-text-on-dark);
}

/* ── Navigation ─────────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  z-index: 100;
  transition: background var(--transition-med),
              backdrop-filter var(--transition-med),
              border-color var(--transition-med);
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(255, 255, 255, 0.80);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-color: rgba(0, 0, 0, 0.10);
}
.site-header--dark {
  /* used when hero is dark — nav starts transparent on dark */
}
.site-header--dark .nav-logo,
.site-header--dark .nav-links a,
.site-header--dark .nav-phone {
  color: #ffffff;
}
.site-header--dark.scrolled .nav-logo,
.site-header--dark.scrolled .nav-links a,
.site-header--dark.scrolled .nav-phone {
  color: var(--color-text);
}
.site-header--dark.scrolled {
  background: rgba(255, 255, 255, 0.82);
}

.nav-inner {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 0 var(--side-pad);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}
.nav-logo {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
  white-space: nowrap;
  transition: color var(--transition-fast);
}
.nav-logo:hover { text-decoration: none; color: var(--color-accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}
.nav-links a {
  font-size: var(--size-small);
  color: var(--color-muted);
  transition: color var(--transition-fast);
}
.nav-links a:hover { color: var(--color-text); text-decoration: none; }

.nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}
.nav-phone {
  font-size: var(--size-small);
  color: var(--color-muted);
  transition: color var(--transition-fast);
}
.nav-phone:hover { color: var(--color-accent); text-decoration: none; }

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: var(--nav-height);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-med), opacity var(--transition-fast);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile nav drawer */
.nav-drawer {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  width: 100%;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  z-index: 99;
  padding: var(--space-md) var(--side-pad-mobile);
  flex-direction: column;
  gap: 2px;
}
.nav-drawer.open { display: flex; }
.nav-drawer a {
  font-size: 17px;
  color: var(--color-text);
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-fast);
}
.nav-drawer a:last-child { border-bottom: none; }
.nav-drawer a:hover { color: var(--color-accent); text-decoration: none; }

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: var(--radius-pill);
  font-family: var(--font-sans);
  font-size: var(--size-body);
  font-weight: 400;
  line-height: 1;
  padding: 13px 24px;
  text-decoration: none;
  transition: background var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast);
  cursor: pointer;
  border: 1.5px solid transparent;
  white-space: nowrap;
}
.btn--primary {
  background: var(--color-accent);
  color: #ffffff;
  border-color: var(--color-accent);
}
.btn--primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  text-decoration: none;
  color: #ffffff;
}
.btn--ghost {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.btn--ghost:hover {
  background: var(--color-accent);
  color: #ffffff;
  text-decoration: none;
}
.btn--ghost-white {
  background: transparent;
  color: #ffffff;
  border-color: rgba(255,255,255,0.6);
}
.btn--ghost-white:hover {
  background: rgba(255,255,255,0.12);
  border-color: #ffffff;
  text-decoration: none;
  color: #ffffff;
}
.btn--white {
  background: #ffffff;
  color: var(--color-accent);
  border-color: #ffffff;
}
.btn--white:hover {
  background: var(--color-bg-alt);
  text-decoration: none;
  color: var(--color-accent);
}
.btn--sm { padding: 9px 18px; font-size: var(--size-small); }

/* ── Typography helpers ──────────────────────────────────────── */
.eyebrow {
  font-size: var(--size-eyebrow);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  margin-bottom: var(--space-sm);
  display: block;
}
.eyebrow--accent { color: var(--color-accent); }

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--color-text);
}
.section--dark h1,
.section--dark h2,
.section--dark h3 { color: var(--color-text-on-dark); }

.section-title {
  font-size: var(--size-h2);
  margin-bottom: var(--space-md);
}
.section-subtitle {
  font-size: var(--size-body-lg);
  color: var(--color-muted);
  line-height: 1.47;
  max-width: 600px;
  margin-bottom: var(--space-lg);
}
.section--dark .section-subtitle { color: var(--color-muted-on-dark); }
.text-center { text-align: center; }
.text-center .section-subtitle { margin-left: auto; margin-right: auto; }

/* ── Cards ───────────────────────────────────────────────────── */
.card {
  background: var(--color-bg);
  border-radius: var(--radius-card);
  padding: 32px;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-med),
              transform var(--transition-med);
}
.card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}
.card--alt { background: var(--color-bg-alt); box-shadow: none; }
.card--alt:hover { box-shadow: var(--shadow-card); }

/* ── Grid ────────────────────────────────────────────────────── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-md); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-md); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-md); }

/* ── Scroll Animations ───────────────────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 600ms var(--ease-out),
              transform 600ms var(--ease-out);
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-up.delay-1 { transition-delay: 80ms; }
.fade-up.delay-2 { transition-delay: 160ms; }
.fade-up.delay-3 { transition-delay: 240ms; }
.fade-up.delay-4 { transition-delay: 320ms; }

/* ── Footer ──────────────────────────────────────────────────── */
.site-footer {
  background: var(--color-darker);
  color: var(--color-muted-on-dark);
  padding: var(--space-xl) 0 var(--space-lg);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}
.footer-brand { max-width: 280px; }
.footer-logo {
  font-size: 18px;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: var(--space-sm);
  display: block;
}
.footer-tagline {
  font-size: var(--size-small);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}
.footer-col h4 {
  font-size: var(--size-small);
  font-weight: 600;
  color: #ffffff;
  letter-spacing: 0.02em;
  margin-bottom: var(--space-sm);
}
.footer-col a {
  display: block;
  font-size: var(--size-small);
  color: var(--color-muted-on-dark);
  margin-bottom: 10px;
  transition: color var(--transition-fast);
}
.footer-col a:hover { color: #ffffff; text-decoration: none; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.10);
  padding-top: var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
  font-size: 12px;
  color: var(--color-subtle);
}
.footer-disclaimer {
  font-size: 11px;
  color: var(--color-subtle);
  margin-top: var(--space-sm);
  line-height: 1.5;
}

/* ── Reduced Motion ──────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .fade-up { opacity: 1; transform: none; }
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 1068px) {
  :root {
    --side-pad: 28px;
  }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-lg); }
}

@media (max-width: 744px) {
  :root {
    --side-pad: var(--side-pad-mobile);
    --section-pad: var(--section-pad-mobile);
  }
  .nav-links, .nav-right { display: none; }
  .nav-toggle { display: flex; }
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  .footer-brand { max-width: 100%; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}