/* =====================================================================
   EverThread.live — site.css
   Single stylesheet. No framework, no preprocessor. Dark-first.
   Goals: fast LCP, accessible focus, ≤640px mobile nav, modern grid.
   ===================================================================== */

/* ---- Tokens ---- */
:root {
  /* Palette — slate + indigo + cyan accent */
  --c-bg:           #0b1120;
  --c-surface:      #111827;
  --c-surface-2:    #0f172a;
  --c-elev:         #1f2937;
  --c-line:         #1f2937;
  --c-line-strong:  #334155;
  --c-text:         #e5e7eb;
  --c-text-mute:    #94a3b8;
  --c-text-dim:     #64748b;
  --c-text-strong:  #f8fafc;

  --c-brand:        #818cf8;       /* indigo-400 */
  --c-brand-strong: #6366f1;       /* indigo-500 */
  --c-brand-soft:   #c7d2fe;
  --c-accent:       #22d3ee;       /* cyan-400 */
  --c-success:      #34d399;       /* emerald-400 */
  --c-warn:         #fbbf24;       /* amber-400 */
  --c-danger:       #f87171;       /* red-400 */

  --c-primary-fg:   #0b1120;
  --c-primary-bg:   #c7d2fe;
  --c-primary-bg-strong: #818cf8;
  --c-primary-bg-hover: #a5b4fc;

  /* Radii / shadow */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;
  --r-xl: 20px;
  --shadow-card: 0 1px 0 rgba(255,255,255,0.04) inset, 0 8px 30px rgba(0,0,0,0.35);
  --shadow-cta: 0 8px 24px rgba(99,102,241,0.35);

  /* Spacing scale */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;
  --sp-7: 48px;
  --sp-8: 64px;
  --sp-9: 96px;

  /* Typography */
  --ff-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
  --ff-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --fs-100: 12px;
  --fs-200: 14px;
  --fs-300: 16px;
  --fs-400: 18px;
  --fs-500: 20px;
  --fs-600: 24px;
  --fs-700: 30px;
  --fs-800: 36px;
  --fs-900: 48px;
  --fs-1000: 60px;

  --lh-tight: 1.15;
  --lh-snug: 1.3;
  --lh-norm: 1.55;
  --lh-loose: 1.7;

  /* Layout */
  --wrap-max: 1180px;
  --wrap-narrow-max: 720px;

  --t-fast: 120ms ease;
  --t-norm: 200ms ease;
}

/* Light scheme — only if the visitor opts in. */
@media (prefers-color-scheme: light) {
  :root {
    --c-bg:           #f8fafc;
    --c-surface:      #ffffff;
    --c-surface-2:    #f1f5f9;
    --c-elev:         #ffffff;
    --c-line:         #e2e8f0;
    --c-line-strong:  #cbd5e1;
    --c-text:         #0f172a;
    --c-text-mute:    #475569;
    --c-text-dim:     #64748b;
    --c-text-strong:  #020617;

    --c-primary-fg:   #ffffff;
    --c-primary-bg:   #4f46e5;
    --c-primary-bg-strong: #4338ca;
    --c-primary-bg-hover: #6366f1;

    --shadow-card: 0 1px 0 rgba(15,23,42,0.04) inset, 0 8px 30px rgba(15,23,42,0.08);
    --shadow-cta: 0 8px 24px rgba(79,70,229,0.25);
  }
}

/* ---- Reset / base ---- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  font-family: var(--ff-sans);
  font-size: var(--fs-300);
  line-height: var(--lh-norm);
  color: var(--c-text);
  background: radial-gradient(1200px 600px at 80% -10%, rgba(129,140,248,0.10), transparent 60%),
              radial-gradient(900px 500px at -10% 30%, rgba(34,211,238,0.08), transparent 60%),
              var(--c-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--c-brand); text-decoration: none; transition: color var(--t-fast); }
a:hover { color: var(--c-brand-soft); }
a:focus-visible, button:focus-visible, summary:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
  border-radius: 6px;
}
h1, h2, h3, h4 { color: var(--c-text-strong); margin: 0; line-height: var(--lh-tight); font-weight: 700; letter-spacing: -0.01em; }
h1 { font-size: clamp(36px, 5.5vw, 56px); letter-spacing: -0.02em; }
h2 { font-size: clamp(28px, 3.5vw, 40px); }
h3 { font-size: var(--fs-600); }
h4 { font-size: var(--fs-200); text-transform: uppercase; letter-spacing: 0.08em; color: var(--c-text-mute); margin-bottom: var(--sp-3); }
p { margin: 0 0 var(--sp-4); }
p:last-child { margin-bottom: 0; }
ul { margin: 0; padding: 0; list-style: none; }
code { font-family: var(--ff-mono); font-size: 0.92em; background: var(--c-surface-2); padding: 1px 6px; border-radius: var(--r-sm); border: 1px solid var(--c-line); }
hr { border: 0; height: 1px; background: var(--c-line); margin: var(--sp-4) 0; }

/* ---- Skip link ---- */
.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--c-accent); color: var(--c-primary-fg);
  padding: var(--sp-2) var(--sp-3); border-radius: 0 0 var(--r-sm) 0;
  z-index: 1000; font-weight: 600;
}
.skip-link:focus { left: 0; }

/* ---- Layout primitives ---- */
.wrap { max-width: var(--wrap-max); margin: 0 auto; padding: 0 var(--sp-5); }
.wrap-narrow { max-width: var(--wrap-narrow-max); }
.section { padding: var(--sp-9) 0; }
.section-alt { background: linear-gradient(180deg, transparent, rgba(255,255,255,0.02) 50%, transparent); border-top: 1px solid var(--c-line); border-bottom: 1px solid var(--c-line); }
.section-cta { padding: var(--sp-9) 0 var(--sp-9); }

/* ---- Header / nav ---- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(11,17,32,0.7);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--c-line);
}
@media (prefers-color-scheme: light) {
  .site-header { background: rgba(248,250,252,0.75); }
}
.nav-wrap { display: flex; align-items: center; gap: var(--sp-5); min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: var(--sp-2); color: var(--c-text-strong); font-weight: 700; letter-spacing: -0.01em; font-size: var(--fs-500); }
.brand:hover { color: var(--c-text-strong); }
.brand-mark { width: 28px; height: 28px; flex: 0 0 28px; }
.brand-word { white-space: nowrap; }

.primary-nav { margin-left: auto; }
.primary-nav ul { display: flex; align-items: center; gap: var(--sp-3); }
.primary-nav a { color: var(--c-text); padding: var(--sp-2) var(--sp-3); border-radius: var(--r-sm); font-size: var(--fs-200); }
.primary-nav a:hover { background: rgba(255,255,255,0.04); color: var(--c-text-strong); }
.nav-link-quiet { color: var(--c-text-mute) !important; }
.nav-sep { width: 1px; height: 22px; background: var(--c-line-strong); margin: 0 var(--sp-2); }

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 40px; height: 40px;
  background: transparent; border: 1px solid var(--c-line-strong); border-radius: var(--r-sm);
  padding: 9px; cursor: pointer; align-items: center; justify-content: center; flex-direction: column; gap: 4px;
}
.nav-toggle-bar { display: block; width: 18px; height: 2px; background: var(--c-text); border-radius: 1px; transition: transform var(--t-fast), opacity var(--t-fast); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(4) { transform: translateY(-6px) rotate(-45deg); }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--sp-2);
  padding: 10px 18px;
  border-radius: var(--r-md);
  font: 600 var(--fs-300)/1.2 var(--ff-sans);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--t-fast), background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
  text-decoration: none;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-sm { padding: 7px 12px; font-size: var(--fs-200); }
.btn-lg { padding: 14px 22px; font-size: var(--fs-400); border-radius: var(--r-lg); }
.btn-block { width: 100%; }
.btn-primary {
  color: var(--c-primary-fg);
  background: linear-gradient(180deg, var(--c-primary-bg-hover), var(--c-primary-bg-strong));
  box-shadow: var(--shadow-cta);
  border-color: rgba(255,255,255,0.08);
}
.btn-primary:hover { color: var(--c-primary-fg); background: linear-gradient(180deg, var(--c-primary-bg-hover), var(--c-primary-bg)); }
.btn-ghost {
  color: var(--c-text-strong);
  background: rgba(255,255,255,0.02);
  border-color: var(--c-line-strong);
}
.btn-ghost:hover { background: rgba(255,255,255,0.06); color: var(--c-text-strong); }

/* Forms used by CTAs */
.cta-form { display: inline; margin: 0; }

/* ---- Hero ---- */
.hero { padding: var(--sp-9) 0 var(--sp-8); position: relative; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: var(--sp-7);
  align-items: center;
}
.eyebrow {
  display: inline-block;
  font-size: var(--fs-100);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin: 0 0 var(--sp-4);
}
.lede { font-size: var(--fs-400); color: var(--c-text-mute); max-width: 56ch; margin-bottom: var(--sp-5); }
.hero h1 { margin-bottom: var(--sp-4); }
.hero h1 + .lede { margin-top: 0; }
.hero-cta-row { display: flex; gap: var(--sp-3); flex-wrap: wrap; align-items: center; margin-bottom: var(--sp-6); }
.hero-cta-row-center { justify-content: center; }
.hero-bullets {
  display: flex; flex-direction: column; gap: var(--sp-2); color: var(--c-text-mute); font-size: var(--fs-200);
}
.hero-bullets li { display: flex; gap: var(--sp-2); align-items: flex-start; }
.hero-bullets li span { color: var(--c-success); }

/* Hero card mock alert */
.hero-card {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  font-size: var(--fs-200);
}
.card-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: var(--sp-3) var(--sp-4); border-bottom: 1px solid var(--c-line); background: var(--c-surface-2);
}
.card-title { color: var(--c-text-strong); font-weight: 600; font-size: var(--fs-200); }
.card-tag {
  background: rgba(248,113,113,0.12); color: var(--c-danger);
  font-size: var(--fs-100); font-weight: 700; padding: 2px 8px; border-radius: 999px;
  text-transform: uppercase; letter-spacing: 0.08em;
}
.card-body { padding: var(--sp-4); }
.card-row { margin: 0 0 var(--sp-2); color: var(--c-text); }
.card-row code { font-size: 0.85em; }
.finding-target { color: var(--c-accent); }
.finding-text { color: var(--c-text-mute); }
.card-row-meta { display: flex; justify-content: space-between; font-size: var(--fs-100); color: var(--c-text-dim); }
.card-state { color: var(--c-warn); font-weight: 600; }
.muted { color: var(--c-text-dim); }

/* ---- Section headers ---- */
.section-header { text-align: center; max-width: 720px; margin: 0 auto var(--sp-7); }
.section-header h2 { margin-bottom: var(--sp-3); }
.section-lede { color: var(--c-text-mute); font-size: var(--fs-400); }

/* ---- How it works (steps) ---- */
.step-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-5); counter-reset: step; }
.step-card {
  background: var(--c-surface); border: 1px solid var(--c-line); border-radius: var(--r-lg);
  padding: var(--sp-6); position: relative;
  transition: transform var(--t-norm), border-color var(--t-norm), background var(--t-norm);
}
.step-card:hover { transform: translateY(-2px); border-color: var(--c-line-strong); background: var(--c-surface-2); }
.step-num {
  display: inline-block;
  font-family: var(--ff-mono);
  font-size: var(--fs-200);
  color: var(--c-accent);
  background: rgba(34,211,238,0.08);
  border: 1px solid rgba(34,211,238,0.25);
  padding: 2px 10px;
  border-radius: 999px;
  margin-bottom: var(--sp-4);
}
.step-card h3 { margin-bottom: var(--sp-2); }
.step-card p { color: var(--c-text-mute); margin: 0; }

/* ---- What we check (grid) ---- */
.check-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-4); }
.check-card {
  background: var(--c-surface); border: 1px solid var(--c-line); border-radius: var(--r-md);
  padding: var(--sp-5);
}
.check-card h3 { font-size: var(--fs-400); margin-bottom: var(--sp-2); color: var(--c-text-strong); }
.check-card p { color: var(--c-text-mute); margin: 0; font-size: var(--fs-200); }
.check-footnote { text-align: center; margin-top: var(--sp-6); color: var(--c-text-dim); font-size: var(--fs-200); }

/* ---- Pricing ---- */
.pricing-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--sp-5); align-items: stretch; max-width: 880px; margin: 0 auto; }
.plan-card {
  background: var(--c-surface); border: 1px solid var(--c-line); border-radius: var(--r-lg);
  padding: var(--sp-7); display: flex; flex-direction: column; gap: var(--sp-4);
  position: relative;
}
.plan-card-featured {
  border-color: var(--c-brand-strong);
  background: linear-gradient(180deg, rgba(99,102,241,0.08), var(--c-surface) 50%);
  box-shadow: var(--shadow-cta);
}
.plan-badge {
  position: absolute; top: -12px; right: var(--sp-5);
  background: var(--c-brand-strong); color: var(--c-primary-fg);
  font-size: var(--fs-100); font-weight: 700; padding: 4px 10px; border-radius: 999px;
  text-transform: uppercase; letter-spacing: 0.08em;
}
.plan-header h3 { font-size: var(--fs-700); margin-bottom: var(--sp-1); }
.plan-tagline { color: var(--c-text-mute); margin: 0; font-size: var(--fs-200); }
.plan-price { display: flex; align-items: baseline; gap: 4px; margin: 0; }
.plan-amount { font-size: var(--fs-1000); font-weight: 700; color: var(--c-text-strong); line-height: 1; letter-spacing: -0.03em; }
.plan-period { color: var(--c-text-mute); font-size: var(--fs-500); }
.plan-feats { display: flex; flex-direction: column; gap: var(--sp-2); margin: var(--sp-2) 0 var(--sp-4); }
.plan-feats li { display: flex; gap: var(--sp-3); align-items: flex-start; color: var(--c-text); font-size: var(--fs-200); }
.plan-feats li span { color: var(--c-success); flex: 0 0 1em; }
.plan-card .btn { margin-top: auto; }
.plan-fine { color: var(--c-text-dim); font-size: var(--fs-100); text-align: center; margin: var(--sp-3) 0 0; }

/* ---- Proof ---- */
.proof-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: var(--sp-3); max-width: 880px; margin: 0 auto; }
.proof-cell {
  display: flex; align-items: center; justify-content: center;
  height: 80px;
  background: var(--c-surface); border: 1px dashed var(--c-line-strong); border-radius: var(--r-md);
  color: var(--c-text-dim); font-size: var(--fs-200); font-weight: 600;
}

/* ---- FAQ ---- */
.faq-list { max-width: 780px; margin: 0 auto; display: flex; flex-direction: column; gap: var(--sp-3); }
.faq-list details {
  background: var(--c-surface); border: 1px solid var(--c-line); border-radius: var(--r-md);
  padding: var(--sp-4) var(--sp-5); transition: border-color var(--t-fast), background var(--t-fast);
}
.faq-list details[open] { background: var(--c-surface-2); border-color: var(--c-line-strong); }
.faq-list summary {
  cursor: pointer; font-weight: 600; color: var(--c-text-strong);
  list-style: none; display: flex; justify-content: space-between; align-items: center; gap: var(--sp-3);
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+"; color: var(--c-brand); font-size: var(--fs-600); font-weight: 400; transition: transform var(--t-fast);
}
.faq-list details[open] summary::after { content: "−"; }
.faq-list p { margin-top: var(--sp-3); color: var(--c-text-mute); }

/* ---- Section CTA (final) ---- */
.section-cta { text-align: center; }
.section-cta h2 { margin-bottom: var(--sp-3); }
.section-cta p { color: var(--c-text-mute); margin-bottom: var(--sp-6); }

/* ---- Footer ---- */
.site-footer { border-top: 1px solid var(--c-line); padding: var(--sp-8) 0 var(--sp-6); background: var(--c-surface-2); }
.footer-wrap { display: grid; grid-template-columns: 1.2fr 2fr; gap: var(--sp-7); align-items: start; }
.footer-tag { color: var(--c-text-mute); font-size: var(--fs-200); margin-top: var(--sp-2); }
.footer-nav { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-5); }
.footer-nav ul { display: flex; flex-direction: column; gap: var(--sp-2); }
.footer-nav a { color: var(--c-text-mute); font-size: var(--fs-200); }
.footer-nav a:hover { color: var(--c-text-strong); }
.footer-fine { grid-column: 1 / -1; color: var(--c-text-dim); font-size: var(--fs-100); margin: 0; padding-top: var(--sp-5); border-top: 1px solid var(--c-line); }

/* ---- Legal pages ---- */
.legal-page { padding: var(--sp-7) var(--sp-5); }
.legal-page h1 { margin-bottom: var(--sp-3); }
.legal-page h2 { margin-top: var(--sp-7); margin-bottom: var(--sp-3); font-size: var(--fs-600); }
.legal-page ul { list-style: disc; padding-left: var(--sp-5); margin-bottom: var(--sp-4); display: flex; flex-direction: column; gap: var(--sp-2); color: var(--c-text-mute); }
.legal-meta { color: var(--c-text-dim); font-size: var(--fs-200); margin-bottom: var(--sp-5); }

/* ---- Responsive ---- */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: var(--sp-6); }
  .hero-card { max-width: 460px; }
  .step-grid { grid-template-columns: 1fr; }
  .check-grid { grid-template-columns: repeat(2, 1fr); }
  .proof-row { grid-template-columns: repeat(3, 1fr); }
  .footer-wrap { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .nav-toggle { display: inline-flex; }
  .primary-nav {
    position: fixed; top: 64px; left: 0; right: 0;
    background: var(--c-surface-2);
    border-bottom: 1px solid var(--c-line);
    transform: translateY(-8px); opacity: 0; pointer-events: none;
    transition: opacity var(--t-norm), transform var(--t-norm);
    padding: var(--sp-3) var(--sp-5) var(--sp-5);
    box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  }
  .primary-nav.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  body.nav-open { overflow: hidden; }
  .primary-nav ul { flex-direction: column; align-items: stretch; gap: var(--sp-1); }
  .primary-nav a { padding: var(--sp-3) var(--sp-3); border-radius: var(--r-sm); }
  .primary-nav .cta-form { display: block; }
  .primary-nav .btn { width: 100%; }
  .nav-sep { display: none; }

  .section { padding: var(--sp-8) 0; }
  .hero { padding: var(--sp-7) 0 var(--sp-6); }
  .check-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .proof-row { grid-template-columns: repeat(2, 1fr); }
  .footer-nav { grid-template-columns: repeat(2, 1fr); }
  .hero-cta-row { flex-direction: column; align-items: stretch; }
  .hero-cta-row .btn { width: 100%; }
}

@media (max-width: 380px) {
  .footer-nav { grid-template-columns: 1fr; }
  .proof-row { grid-template-columns: 1fr 1fr; }
}

/* ---- Reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
  .btn:hover, .step-card:hover { transform: none; }
}

/* ---- Print: legible & compact ---- */
@media print {
  .site-header, .nav-toggle, .primary-nav, .hero-card, .section-cta, .site-footer { display: none !important; }
  body { background: white; color: black; }
  a { color: black; text-decoration: underline; }
  .section { padding: 1cm 0; }
}