/* Hello marketing site — Phase 0a */

:root {
  --color-bg: #ffffff;
  --color-bg-soft: #f7f8fb;
  --color-bg-dark: #0f172a;
  --color-text: #0f172a;
  --color-text-soft: #475569;
  --color-muted: #94a3b8;
  --color-border: #e2e8f0;
  --color-primary: #4f46e5;
  --color-primary-dark: #4338ca;
  --color-primary-soft: #eef2ff;
  --color-accent: #10b981;
  --color-danger: #ef4444;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12);
  --container: 1140px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 0.5em; color: var(--color-text); }
h1 { font-size: 2.75rem; letter-spacing: -0.02em; }
h2 { font-size: 2rem; letter-spacing: -0.01em; }
h3 { font-size: 1.25rem; }
p  { margin: 0 0 1em; color: var(--color-text-soft); }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.muted { color: var(--color-muted); font-size: 0.9rem; }

/* ---------- Header ---------- */
.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(8px);
}
.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  font-weight: 700;
  text-decoration: none;
  font-size: 1.1rem;
}
.brand:hover { text-decoration: none; }
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 32px; height: 32px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.brand-mark-sm { width: 24px; height: 24px; font-size: 0.7rem; border-radius: 6px; }
.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}
.site-nav a {
  color: var(--color-text-soft);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
}
.site-nav a:hover { color: var(--color-text); }
.site-nav a.active { color: var(--color-text); }
.site-nav .nav-user {
  color: var(--color-text-soft);
  font-size: 0.9rem;
}
.site-nav .nav-user strong { color: var(--color-text); font-weight: 600; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-dark); text-decoration: none; }
.btn-secondary { background: #fff; color: var(--color-text); border-color: var(--color-border); }
.btn-secondary:hover { background: var(--color-bg-soft); text-decoration: none; }
.btn-sm { padding: 8px 14px; font-size: 0.9rem; }
.btn-lg { padding: 14px 28px; font-size: 1rem; }
.btn-block { display: block; width: 100%; text-align: center; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(180deg, #f5f3ff 0%, #ffffff 100%);
  padding: 88px 0 64px;
  border-bottom: 1px solid var(--color-border);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
}
.hero-eyebrow {
  display: inline-block;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 16px;
}
.hero h1 { margin-bottom: 16px; }
.hero p.lead { font-size: 1.15rem; color: var(--color-text-soft); margin-bottom: 28px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }

/* Video placeholder */
.video-placeholder {
  position: relative;
  aspect-ratio: 16 / 10;
  background: linear-gradient(135deg, #1e293b 0%, #4f46e5 100%);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: grid;
  place-items: center;
  color: rgba(255,255,255,0.95);
  overflow: hidden;
}
.video-placeholder::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(255,255,255,0.15), transparent 40%),
    radial-gradient(circle at 80% 80%, rgba(16,185,129,0.25), transparent 40%);
}
.play-icon {
  width: 76px;
  height: 76px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
  border: 2px solid rgba(255,255,255,0.6);
  display: grid;
  place-items: center;
  position: relative;
  z-index: 1;
  backdrop-filter: blur(4px);
}
.play-icon::after {
  content: "";
  display: block;
  width: 0; height: 0;
  border-left: 22px solid #fff;
  border-top: 13px solid transparent;
  border-bottom: 13px solid transparent;
  margin-left: 6px;
}
.video-caption {
  position: absolute;
  bottom: 16px;
  left: 16px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.85);
  z-index: 1;
}

/* ---------- Sections ---------- */
.section { padding: 72px 0; }
.section-soft { background: var(--color-bg-soft); }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { margin-bottom: 12px; }
.section-header p { max-width: 640px; margin: 0 auto; font-size: 1.05rem; }

/* ---------- Feature grid ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: 16px;
}
.feature-card h3 { margin-bottom: 8px; font-size: 1.1rem; }
.feature-card p { margin: 0; font-size: 0.95rem; }

/* ---------- How it works ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step;
}
.step {
  text-align: left;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}
.step-number {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  margin-bottom: 12px;
}
.step h3 { font-size: 1.05rem; margin-bottom: 6px; }
.step p { font-size: 0.92rem; margin: 0; }

/* ---------- CTA banner ---------- */
.cta-banner {
  background: linear-gradient(135deg, var(--color-primary) 0%, #7c3aed 100%);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 48px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}
.cta-banner h2 { color: #fff; margin-bottom: 12px; }
.cta-banner p { color: rgba(255,255,255,0.9); margin-bottom: 24px; }
.cta-banner .btn-secondary {
  background: #fff;
  color: var(--color-primary);
  border-color: #fff;
}
.cta-banner .btn-secondary:hover { background: rgba(255,255,255,0.92); }

/* ---------- Forms ---------- */
.form-shell {
  max-width: 640px;
  margin: 0 auto;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
}
.form-row { margin-bottom: 18px; }
.form-row.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text);
  margin-bottom: 6px;
}
label .required { color: var(--color-danger); margin-left: 2px; }
input[type=text], input[type=email], input[type=tel], input[type=date], input[type=time], select, textarea {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--color-text);
  background: #fff;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}
textarea { min-height: 120px; resize: vertical; }
.form-help { font-size: 0.85rem; color: var(--color-muted); margin-top: 6px; }

/* Alerts */
.alert {
  padding: 14px 16px;
  border-radius: var(--radius);
  margin-bottom: 24px;
  font-size: 0.95rem;
}
.alert-success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-error   { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }

/* Page header (interior pages) */
.page-header {
  background: var(--color-bg-soft);
  padding: 56px 0;
  border-bottom: 1px solid var(--color-border);
  text-align: center;
}
.page-header h1 { font-size: 2.25rem; margin-bottom: 8px; }
.page-header p { font-size: 1.05rem; max-width: 560px; margin: 0 auto; }

/* ---------- Features deep-dive list ---------- */
.feature-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  padding: 56px 0;
  border-bottom: 1px solid var(--color-border);
}
.feature-detail:last-child { border-bottom: none; }
.feature-detail.reverse { direction: rtl; }
.feature-detail.reverse > * { direction: ltr; }
.feature-detail h2 { font-size: 1.6rem; margin-bottom: 12px; }
.feature-detail .visual {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  aspect-ratio: 4 / 3;
  display: grid;
  place-items: center;
  color: var(--color-muted);
  font-size: 0.9rem;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-bg-dark);
  color: #cbd5e1;
  padding: 56px 0 24px;
  margin-top: 64px;
}
.site-footer .brand-name { color: #fff; }
.site-footer h4 { color: #fff; font-size: 0.95rem; margin-bottom: 14px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { color: #cbd5e1; }
.site-footer a:hover { color: #fff; }
.site-footer .muted { color: #94a3b8; }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid #1e293b;
}
.footer-bottom { padding-top: 20px; }

/* ---------- Responsive ---------- */
@media (max-width: 880px) {
  h1 { font-size: 2.1rem; }
  h2 { font-size: 1.6rem; }
  .hero { padding: 56px 0 40px; }
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .feature-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .feature-detail { grid-template-columns: 1fr; gap: 24px; padding: 36px 0; }
  .feature-detail.reverse { direction: ltr; }
  .form-row.two-col { grid-template-columns: 1fr; }
  .site-nav { gap: 14px; }
  .site-nav a:not(.btn) { display: none; }
  .cta-banner { padding: 32px 20px; }
}