/* ============================================================
   FlowMD Landing — Styles
   Calm, TimyLabs-shaped formatting on FlowMD's modern dark
   identity (background #0b0f19, accent gradient #6c3baa → #8b5cf6).
   No external fonts, no remote requests (system stacks only).
   ============================================================ */

:root {
  --bg: #0b0f19;
  --surface: #111827;
  --surface-2: #0f1522;
  --surface-hover: #1f2937;
  --border: #1f293d;
  --accent: #6c3baa;
  --accent-hover: #5a2f8e;
  --accent-grad: linear-gradient(135deg, #6c3baa, #8b5cf6);
  --success: #10b981;
  --text: #f8fafc;
  --text-2: #94a3b8;
  --text-3: #64748b;
  --radius: 12px;
  --font: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

img { display: block; max-width: 100%; }

a { color: #a78bfa; text-decoration: none; }
a:hover { color: #c4b5fd; }

:focus-visible {
  outline: 2px solid #8b5cf6;
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.nav-logo:hover { color: var(--text); }
.nav-logo-img { border-radius: 8px; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 0.92rem;
}
.nav-menu a:not(.cta-open-app) { color: var(--text-2); }
.nav-menu a:not(.cta-open-app):hover { color: var(--text); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text-2);
  margin: 3px 0;
  border-radius: 2px;
}

/* ---------- Buttons ---------- */
.cta-open-app, .btn {
  display: inline-block;
  background: var(--accent-grad);
  color: #ffffff;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 10px 20px;
  border-radius: 10px;
  border: 1px solid transparent;
  transition: filter 150ms ease;
}
.cta-open-app:hover, .btn:hover { color: #ffffff; filter: brightness(1.12); }
.nav-cta { padding: 8px 16px; font-size: 0.88rem; }

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover { color: var(--text); background: var(--surface-hover); border-color: #334155; }

/* ---------- Hero ---------- */
.hero {
  max-width: 1100px;
  margin: 0 auto;
  padding: 64px 24px 40px;
  text-align: center;
}

.hero-kicker, .section-kicker {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #a78bfa;
  margin: 0 0 12px;
}

.hero h1 {
  font-size: clamp(1.9rem, 4.5vw, 2.9rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 auto 16px;
  max-width: 18ch;
}

.hero-sub {
  color: var(--text-2);
  font-size: 1.08rem;
  max-width: 52ch;
  margin: 0 auto 28px;
}

.hero-cta { padding: 14px 30px; font-size: 1rem; }

.hero-ctas { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; align-items: center; margin-bottom: 14px; }
.hero-cta-secondary {
  display: inline-block;
  padding: 14px 24px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-2);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.hero-cta-secondary:hover { color: var(--text); border-color: #334155; background: var(--surface-hover); }
.hero-install-note { color: var(--text-3); font-size: 0.85rem; margin: 0; }
.beta-data-note {
  margin: 14px auto 0;
  max-width: 52ch;
  color: var(--text-2);
  font-size: 0.92rem;
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: var(--radius);
  padding: 10px 14px;
}

.hero-carousel {
  margin-top: 44px;
  text-align: center;
}

.hero-carousel-viewport {
  position: relative;
  height: 360px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface-2);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

.hero-slide {
  margin: 0 auto;
  opacity: 0;
  position: absolute;
  inset: 0;
  pointer-events: none;
  transition: opacity 700ms ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 28px 24px;
  max-width: 620px;
  box-sizing: border-box;
}
.hero-slide.active { opacity: 1; pointer-events: auto; }

.feature-panel-num {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: #a78bfa;
  margin: 0 0 4px;
  font-weight: 600;
}
.feature-panel-title {
  font-size: clamp(1.25rem, 2.4vw, 1.6rem);
  letter-spacing: -0.015em;
  margin: 0;
  color: var(--text);
}
.feature-panel-body {
  color: var(--text-2);
  font-size: 1rem;
  line-height: 1.55;
  margin: 0;
  max-width: 46ch;
}

/* Phone device frame for the mobile-app screenshots */
.phone-frame {
  width: min(280px, 72vw);
  flex-shrink: 0;
  background: #0b0f19;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 34px;
  padding: 10px;
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.5),
    inset 0 0 0 1px rgba(0, 0, 0, 0.6);
}
.phone-frame img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 24px;
}

.hero-carousel-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 14px;
}

.hero-carousel-controls button {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  width: 44px;
  height: 40px;
  font-size: 1.1rem;
  cursor: pointer;
  transition: background 150ms ease;
}
.hero-carousel-controls button:hover { background: var(--surface-hover); }

.hero-dots {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}
.hero-dots button {
  width: 9px;
  height: 9px;
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--text-3);
  background: transparent;
  cursor: pointer;
}
.hero-dots button[aria-current="true"] {
  background: var(--accent-grad);
  border-color: transparent;
}

/* ---------- Sections ---------- */
.features, .beta, .about, .faq {
  max-width: 1100px;
  margin: 0 auto;
  padding: 72px 24px;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  letter-spacing: -0.015em;
  margin: 0 0 40px;
}

.features .section-title { margin-bottom: 56px; }

.feature-block {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 36px;
  align-items: center;
  margin-bottom: 72px;
}
.feature-block:nth-child(even) .feature-figure { order: -1; }

.feature-copy h3 {
  font-size: 1.35rem;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
}
.feature-copy p {
  color: var(--text-2);
  margin: 0;
  max-width: 40ch;
}

.feature-figure {
  margin: 0;
  display: flex;
  justify-content: center;
}
.feature-figure .phone-frame {
  width: min(300px, 100%);
}
.feature-figure img {
  width: 100%;
  height: auto;
}

/* ---------- Beta ---------- */
.beta-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 48px;
  text-align: center;
}
.beta-card p:not(.section-kicker) {
  color: var(--text-2);
  max-width: 52ch;
  margin: 0 auto 28px;
}
.beta-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- About ---------- */
.about-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px 44px;
  max-width: 760px;
}
.about-card p {
  color: var(--text-2);
  margin: 0 0 16px;
}
.about-card p:last-of-type { margin-bottom: 24px; }

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 760px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-list details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
}
.faq-list summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 1.02rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+";
  color: var(--text-3);
  font-size: 1.2rem;
  transition: transform 150ms ease;
}
.faq-list details[open] summary::after { transform: rotate(45deg); }
.faq-list details p {
  color: var(--text-2);
  margin: 12px 0 0;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 40px;
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 24px 48px;
  text-align: center;
}
.footer-inner .nav-logo { justify-content: center; margin-bottom: 12px; }
.footer-note { color: var(--text-3); font-size: 0.85rem; max-width: 60ch; margin: 0 auto 16px; }
.footer-links {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
  font-size: 0.9rem;
  margin-bottom: 14px;
}
.footer-legal { color: var(--text-3); font-size: 0.78rem; margin: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .feature-block { grid-template-columns: 1fr; gap: 20px; }
  .feature-block:nth-child(even) .feature-figure { order: 0; }
  .feature-copy p { max-width: 60ch; }
}

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav-menu {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 18px 24px 22px;
  }
  .nav-menu.open { display: flex; }
  .hero { padding-top: 48px; }
  .beta-card, .about-card { padding: 32px 24px; }
}

@media (max-width: 768px) {
  .features, .beta, .about, .faq { padding: 56px 20px; }
  .feature-block { margin-bottom: 56px; }
}

@media (max-width: 390px) {
  .hero h1 { font-size: 1.7rem; }
  .hero-carousel-controls button { width: 40px; }
  .beta-actions { flex-direction: column; }
  .beta-actions .btn { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-slide { transition: none; }
  * { transition: none !important; }
}