/* ============================================================
   THEOS MARKETING SITE — SHARED DESIGN SYSTEM
   theos.css — v1.0
   
   Fonts loaded via Google Fonts:
     - Fraunces (300) — display / headlines
     - Lora (400) — body / Theo responses
     - DM Sans (500, 600) — UI chrome / nav / buttons
   ============================================================ */

/* ─── Custom Properties ────────────────────────────────────── */
:root {
  /* Brand Colors */
  --color-purple:        #a855f7;
  --color-purple-deep:   #7c3aed;
  --color-purple-light:  #d8b4fe;
  --color-purple-faint:  #f5f0ff;
  --color-violet-dark:   #4c1d95;

  /* Neutrals */
  --color-ink:           #0f0a1e;
  --color-ink-mid:       #2e2440;
  --color-muted:         #6b5e80;
  --color-border:        #e8e1f5;
  --color-surface:       #faf8ff;
  --color-white:         #ffffff;

  /* Semantic */
  --color-text-primary:  var(--color-ink);
  --color-text-secondary:var(--color-muted);
  --color-accent:        var(--color-purple);

  /* Typography */
  --font-display:  'Fraunces', Georgia, serif;
  --font-body:     'Lora', Georgia, serif;
  --font-ui:       'DM Sans', system-ui, sans-serif;

  /* Spacing */
  --space-xs:  0.375rem;
  --space-sm:  0.75rem;
  --space-md:  1.25rem;
  --space-lg:  2rem;
  --space-xl:  3.5rem;
  --space-2xl: 6rem;
  --space-3xl: 9rem;

  /* Layout */
  --max-width:       1280px;
  --max-width-prose: 720px;
  --radius-sm:       6px;
  --radius-md:       12px;
  --radius-lg:       20px;
  --radius-pill:     999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(76,29,149,0.07), 0 1px 2px rgba(76,29,149,0.05);
  --shadow-md: 0 4px 16px rgba(76,29,149,0.10), 0 2px 6px rgba(76,29,149,0.06);
  --shadow-lg: 0 12px 40px rgba(76,29,149,0.14), 0 4px 12px rgba(76,29,149,0.08);

  /* Transitions */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

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

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text-primary);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* ─── Typography Scale ──────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

h1 { font-size: clamp(2.4rem, 5.5vw, 4.2rem); }
h2 { font-size: clamp(1.9rem, 4vw, 3rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.8rem); }
h4 { font-size: 1.2rem; }

p {
  font-family: var(--font-body);
  color: var(--color-text-secondary);
  max-width: 64ch;
}

.ui-text {
  font-family: var(--font-ui);
  font-weight: 500;
}

/* ─── Layout Utilities ──────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.prose-container {
  max-width: var(--max-width-prose);
}

.section {
  padding: var(--space-3xl) 0;
}

.section--compact {
  padding: var(--space-2xl) 0;
}

.section--tinted {
  background: var(--color-surface);
}

.section--dark {
  background: var(--color-ink);
  color: var(--color-white);
}

.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: var(--color-white);
}

.section--dark p {
  color: var(--color-purple-light);
}

/* ─── Navigation ────────────────────────────────────────────── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: var(--space-lg);
}

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

.nav-logo__mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--color-purple), var(--color-violet-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.nav-logo__mark svg {
  width: 18px;
  height: 18px;
}

.nav-logo__wordmark {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 300;
  letter-spacing: -0.01em;
  color: var(--color-ink);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-links a {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-muted);
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-ink);
}

.nav-signin {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-muted) !important;
  transition: color 0.2s;
}

.nav-signin:hover {
  color: var(--color-ink) !important;
}

.nav-cta {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-pill);
  background: var(--color-purple);
  color: var(--color-white) !important;
  transition: background 0.2s, transform 0.15s;
}

.nav-cta:hover {
  background: var(--color-purple-deep);
  transform: translateY(-1px);
}

.nav-mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.nav-mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-ink);
  border-radius: 2px;
  transition: transform 0.25s;
}

/* ─── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-pill);
  transition: all 0.2s var(--ease-out);
  white-space: nowrap;
  text-decoration: none;
}

.btn--primary {
  background: var(--color-purple);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(168,85,247,0.35);
}

.btn--primary:hover {
  background: var(--color-purple-deep);
  box-shadow: 0 6px 20px rgba(168,85,247,0.45);
  transform: translateY(-2px);
}

.btn--outline {
  border: 1.5px solid var(--color-border);
  color: var(--color-ink);
  background: transparent;
}

.btn--outline:hover {
  border-color: var(--color-purple);
  color: var(--color-purple);
  transform: translateY(-2px);
}

.btn--ghost {
  color: var(--color-purple);
  padding-left: 0;
  padding-right: 0;
}

.btn--ghost:hover { text-decoration: underline; }

.btn--large {
  font-size: 1rem;
  padding: 0.9375rem 2rem;
}

/* ─── Eyebrow Labels ────────────────────────────────────────── */
.eyebrow {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-purple);
  margin-bottom: var(--space-sm);
}

/* ─── Section Headers ───────────────────────────────────────── */
.section-header {
  margin-bottom: var(--space-2xl);
}

.section-header--centered {
  text-align: center;
}

.section-header--centered p {
  margin: var(--space-md) auto 0;
}

.section-header p {
  margin-top: var(--space-md);
  font-size: 1.0625rem;
}

/* ─── Cards ─────────────────────────────────────────────────── */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: box-shadow 0.3s var(--ease-out), transform 0.3s var(--ease-out);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.card--tinted {
  background: var(--color-surface);
  border-color: transparent;
}

.card--purple {
  background: linear-gradient(135deg, #f9f0ff, #f0e8ff);
  border-color: var(--color-purple-light);
}

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

/* ─── Feature Icon ──────────────────────────────────────────── */
.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--color-purple-faint);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  flex-shrink: 0;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-purple);
}

/* ─── Number Pill ───────────────────────────────────────────── */
.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-purple);
  color: var(--color-white);
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 300;
  flex-shrink: 0;
}

/* ─── Divider ───────────────────────────────────────────────── */
.divider {
  border: none;
  height: 1px;
  background: var(--color-border);
  margin: var(--space-xl) 0;
}

/* ─── Callout Box ───────────────────────────────────────────── */
.callout {
  border-left: 3px solid var(--color-purple);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-purple-faint);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.callout p { max-width: none; }

/* ─── Footer ────────────────────────────────────────────────── */
.site-footer {
  background: var(--color-ink);
  color: var(--color-purple-light);
  padding: var(--space-2xl) 0 var(--space-lg);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand p {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.45);
  margin-top: var(--space-sm);
  max-width: 28ch;
}

.footer-col h5 {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: var(--space-md);
}

.footer-col ul li {
  margin-bottom: 0.5rem;
}

.footer-col ul li a {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  color: rgba(255,255,255,0.6);
  transition: color 0.2s;
}

.footer-col ul li a:hover {
  color: var(--color-white);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-lg);
}

.footer-bottom p {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: rgba(255,255,255,0.3);
  max-width: none;
}

/* ─── CTA Banner ────────────────────────────────────────────── */
.cta-banner {
  background: linear-gradient(135deg, var(--color-violet-dark) 0%, var(--color-purple-deep) 50%, #9333ea 100%);
  padding: var(--space-3xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 60% 40%, rgba(255,255,255,0.06) 0%, transparent 60%);
  pointer-events: none;
}

.cta-banner h2,
.cta-banner h3 {
  color: var(--color-white);
}

.cta-banner p {
  color: rgba(255,255,255,0.75);
  margin: var(--space-md) auto var(--space-xl);
  font-size: 1.0625rem;
}

.cta-banner .btn--primary {
  background: var(--color-white);
  color: var(--color-purple-deep);
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.cta-banner .btn--primary:hover {
  background: var(--color-purple-faint);
  box-shadow: 0 6px 28px rgba(0,0,0,0.28);
}

.cta-banner .btn--outline {
  border-color: rgba(255,255,255,0.35);
  color: var(--color-white);
}

.cta-banner .btn--outline:hover {
  border-color: var(--color-white);
  background: rgba(255,255,255,0.08);
}

/* ─── Animations ────────────────────────────────────────────── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.animate-fade-in-up {
  animation: fadeInUp 0.7s var(--ease-out) both;
}

.animate-fade-in {
  animation: fadeIn 0.6s ease both;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.45s; }
.delay-5 { animation-delay: 0.6s; }

/* ─── Responsive ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  :root {
    --space-2xl: 4rem;
    --space-3xl: 5.5rem;
  }

  .container { padding: 0 var(--space-md); }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: var(--space-xl); }
  .footer-bottom { flex-direction: column; gap: var(--space-sm); text-align: center; }
  
  .nav-links { display: none; }
  .nav-mobile-toggle { display: flex; }

  .nav-links.is-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md) var(--space-lg);
    gap: var(--space-md);
  }
}