/* ============================================================
   BrokerFlow AI — styles.css
   Shared styles for index.html and agents.html
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  --color-bg: #0f1115;
  --color-surface: #171a21;
  --color-surface-2: #1f232c;
  --color-border: #2a2f3a;
  --color-text: #e8eaed;
  --color-text-muted: #a3aab8;
  --color-primary: #4f8cff;
  --color-primary-dark: #356ae0;
  --color-accent: #36d399;
  --color-warning: #f5c451;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --radius: 14px;
  --radius-sm: 8px;
  --maxw: 1100px;
  --gap: 1.5rem;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
  --transition: 180ms ease;
}

/* ---------- Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { line-height: 1.2; margin: 0 0 0.5em; }
p { margin: 0 0 1rem; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-text); }
img { max-width: 100%; display: block; }

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.section { padding: 5rem 0; }
.section-alt { background: var(--color-surface); }
.section-title { font-size: clamp(1.6rem, 3vw, 2.2rem); text-align: center; }
.section-intro {
  text-align: center;
  color: var(--color-text-muted);
  max-width: 640px;
  margin: 0 auto 2.5rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 0.7rem 1.3rem;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}
.btn:hover { background: var(--color-primary-dark); color: #fff; transform: translateY(-1px); }
.btn-small { padding: 0.45rem 0.9rem; font-size: 0.85rem; }
.btn-large { padding: 0.9rem 1.8rem; font-size: 1.05rem; }
.btn-ghost {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}
.btn-ghost:hover { background: var(--color-surface-2); color: #fff; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(15, 17, 21, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 0.6rem; font-weight: 700; color: var(--color-text); }
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 800;
}
.site-nav { display: flex; align-items: center; gap: 1.5rem; }
.site-nav a { color: var(--color-text-muted); font-size: 0.95rem; font-weight: 500; }
.site-nav a:hover { color: var(--color-text); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  width: 24px; height: 2px;
  background: var(--color-text);
  transition: var(--transition);
}

/* ---------- Hero ---------- */
.hero {
  padding: 6rem 0 4rem;
  background: radial-gradient(1200px 500px at 50% -10%, rgba(79, 140, 255, 0.18), transparent 70%);
  text-align: center;
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: 1rem;
}
.hero h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
.lead {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 640px;
  margin: 1rem auto 2rem;
}
.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.hero-note { margin-top: 1.5rem; font-size: 0.9rem; color: var(--color-warning); }

/* ---------- Trust bar ---------- */
.trust-bar {
  padding: 1.5rem 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  text-align: center;
}
.trust-bar p { margin: 0; color: var(--color-text-muted); font-size: 0.95rem; }

/* ---------- Cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--gap);
}
.card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.6rem;
  transition: transform var(--transition), border-color var(--transition);
}
.card:hover { transform: translateY(-3px); border-color: var(--color-primary); }
.card-icon { font-size: 1.8rem; margin-bottom: 0.6rem; }
.card h3 { font-size: 1.15rem; }
.card p { color: var(--color-text-muted); margin: 0; }

/* ---------- Steps ---------- */
.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1rem;
  max-width: 760px;
  margin-inline: auto;
}
.steps li {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.2rem 1.4rem;
}
.step-num {
  flex: none;
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  font-weight: 700;
}
.steps h3 { margin: 0 0 0.2rem; font-size: 1.05rem; }
.steps p { margin: 0; color: var(--color-text-muted); }

/* ---------- Calculator ---------- */
.calculator {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: var(--gap);
  align-items: stretch;
  max-width: 860px;
  margin: 0 auto;
}
.calc-form {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.6rem;
}
.calc-field { margin-bottom: 1rem; }
.calc-field label { display: block; font-size: 0.9rem; margin-bottom: 0.35rem; color: var(--color-text-muted); }
.calc-field input {
  width: 100%;
  padding: 0.6rem 0.8rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 1rem;
}
.calc-field input:focus { outline: none; border-color: var(--color-primary); }
.calc-result {
  background: linear-gradient(160deg, var(--color-primary), var(--color-primary-dark));
  border-radius: var(--radius);
  padding: 1.6rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  color: #fff;
}
.calc-headline { font-size: 1.8rem; font-weight: 800; margin: 0; }
.calc-sub { margin: 0.3rem 0 0; opacity: 0.9; }
.calc-disclaimer { margin-top: 0.8rem; font-size: 0.8rem; opacity: 0.75; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 760px; margin: 0 auto; display: grid; gap: 0.8rem; }
.faq-item {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 1.3rem;
}
.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  position: relative;
  padding-right: 1.5rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  color: var(--color-primary);
  font-weight: 700;
}
.faq-item[open] summary::after { content: "−"; }
.faq-item p { margin: 0.8rem 0 0; color: var(--color-text-muted); }

/* ---------- CTA ---------- */
.cta {
  padding: 5rem 0;
  text-align: center;
  background: radial-gradient(900px 400px at 50% 120%, rgba(54, 211, 153, 0.15), transparent 70%);
}
.cta h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
.cta p { color: var(--color-text-muted); max-width: 520px; margin: 0 auto 1.8rem; }

/* ---------- Agent page extras ---------- */
.agent-hero { padding: 5rem 0 2rem; text-align: center;
  background: radial-gradient(1000px 400px at 50% -10%, rgba(79, 140, 255, 0.16), transparent 70%);
}
.pill-row { display: flex; gap: 0.6rem; justify-content: center; flex-wrap: wrap; margin-top: 1.5rem; }
.pill {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}
.principle { padding: 2.5rem 0; }
.principle blockquote {
  max-width: 760px;
  margin: 0 auto;
  background: var(--color-surface-2);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 1.4rem 1.6rem;
  font-size: 1.1rem;
  color: var(--color-text);
}
.guardrail-list { max-width: 700px; margin: 0 auto 1rem; padding-left: 1.2rem; }
.guardrail-list li { margin-bottom: 0.5rem; color: var(--color-text-muted); }
.note { text-align: center; color: var(--color-accent); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  background: var(--color-surface);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.site-footer p { margin: 0; color: var(--color-text-muted); font-size: 0.9rem; }
.footer-nav { display: flex; gap: 1.2rem; }
.footer-nav a { color: var(--color-text-muted); font-size: 0.9rem; }
.footer-nav a:hover { color: var(--color-text); }

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  .calculator { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 0.5rem 1.25rem;
    display: none;
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 0.6rem 0; width: 100%; }
  .section { padding: 3.5rem 0; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}