:root {
  --green: #22c55e;
  --green-dark: #16a34a;
  --charcoal: #1f2933;
  --ink: #111827;
  --muted: #64748b;
  --paper: #ffffff;
  --soft: #f8fafc;
  --line: #e2e8f0;
  --danger: #dc2626;
  --info: #0ea5e9;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}

.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.narrow { width: min(560px, calc(100% - 32px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}
.header-inner, .footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px 0;
}
.brand, .footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.05rem;
}
.brand img, .footer-brand img { width: 42px; height: auto; }
nav { display: flex; gap: 20px; }
nav a { color: var(--muted); text-decoration: none; font-weight: 600; }
nav a:hover { color: var(--charcoal); }

.hero {
  padding: 72px 0 56px;
  background: linear-gradient(180deg, #f0fdf4 0%, #ffffff 100%);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 40px;
  align-items: center;
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: .14em;
  font-size: .78rem;
  font-weight: 700;
  color: var(--green-dark);
}
h1, h2 { color: var(--charcoal); line-height: 1.15; }
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); margin: 12px 0 16px; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin: 0 0 20px; }
.lead { font-size: 1.12rem; color: #334155; max-width: 620px; }
.lead-small { color: #475569; margin-top: 8px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 28px; }
.hero-visual { text-align: center; }
.hero-screenshot-wrap {
  margin: 0;
  padding: 10px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 28px 70px rgba(15, 23, 32, 0.12);
}
.hero-screenshot {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
}

.section { padding: 72px 0; }
.section-muted { background: var(--soft); }
.steps { font-size: 1.08rem; padding-left: 1.2rem; }
.steps li { margin-bottom: 12px; }
.steps code { font-size: .95em; background: #f1f5f9; padding: 2px 6px; border-radius: 4px; }

.how-to-use-grid {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 36px;
  align-items: center;
  margin-top: 28px;
}
.app-screenshot-wrap {
  margin: 0;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 12px;
  box-shadow: 0 20px 50px rgba(15, 23, 32, 0.08);
}
.app-screenshot {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px;
}
.app-screenshot-wrap figcaption {
  margin-top: 10px;
  text-align: center;
  color: var(--muted);
  font-size: .92rem;
}
.how-to-steps { margin: 0; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.feature-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
}
.feature-card h3 { margin: 0 0 8px; font-size: 1.05rem; }
.feature-card p { margin: 0; color: var(--muted); }

.download-section { background: linear-gradient(180deg, #ffffff 0%, #ecfdf5 100%); }
.download-panel {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 32px;
  box-shadow: 0 18px 40px rgba(15,23,32,.06);
}
.download-form label { display: block; font-weight: 600; margin-bottom: 8px; }
.form-row { display: flex; gap: 12px; flex-wrap: wrap; }
.form-row input {
  flex: 1 1 260px;
  min-height: 48px;
  border: 1px solid #cbd5e1;
  border-radius: 12px;
  padding: 0 14px;
  font-size: 1rem;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 12px;
  border: 0;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}
.button.primary { background: var(--green); color: #fff; }
.button.primary:hover { background: var(--green-dark); }
.button.ghost { background: transparent; color: var(--charcoal); border: 1px solid var(--line); }

.alert {
  border-radius: 12px;
  padding: 14px 16px;
  margin: 0 0 18px;
}
.alert-success { background: #ecfdf5; color: #065f46; border: 1px solid #86efac; }
.alert-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.alert-info { background: #eff6ff; color: #1e3a8a; border: 1px solid #bfdbfe; }

.verify-form input[type="email"],
.verify-form input[type="text"] {
  width: 100%;
  min-height: 48px;
  border: 1px solid #cbd5e1;
  border-radius: 12px;
  padding: 0 14px;
  font-size: 1rem;
  margin-bottom: 14px;
}
.verify-form input#code {
  font-size: 1.25rem;
  letter-spacing: .18em;
  text-align: center;
}
.success-section { padding-top: 56px; }
.fine-print { color: var(--muted); font-size: .92rem; }
.site-footer {
  border-top: 1px solid var(--line);
  background: #fff;
  padding: 28px 0 40px;
}
.footer-disclaimer, .footer-copy { color: var(--muted); margin: 8px 0 0; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 16px; }
.footer-nav a { color: var(--muted); text-decoration: none; font-weight: 600; }
.footer-nav a:hover { color: var(--charcoal); }
.success-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }

/* User guide */
.page-user-guide .site-header { position: static; }
.guide-hero {
  padding: 56px 0 32px;
  background: linear-gradient(180deg, #f0fdf4 0%, #ffffff 100%);
}
.guide-hero-inner { max-width: 984px; }
.guide-intro { color: #334155; font-size: 1.05rem; }
.guide-video {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.guide-video-title {
  margin: 0 0 8px;
  font-size: 1.35rem;
  color: var(--charcoal);
}
.guide-video-lead {
  margin: 0 0 18px;
  color: #475569;
}
.guide-video-embed {
  position: relative;
  width: 100%;
  max-width: 1080px;
  aspect-ratio: 16 / 9;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 16px 40px rgba(15, 23, 32, 0.08);
  background: #0f1720;
}
.guide-video-embed iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
.guide-section { padding-top: 32px; }
.guide-callout {
  background: #fff;
  border: 1px solid var(--line);
  border-left: 5px solid var(--green);
  border-radius: 16px;
  padding: 24px 28px;
  margin-bottom: 24px;
}
.guide-callout h2 { margin-top: 0; font-size: 1.25rem; }
.guide-callout ul { margin: 0; padding-left: 1.2rem; }
.guide-platform-note { color: #475569; margin-bottom: 32px; }
.guide-overview {
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px 26px;
  margin-bottom: 40px;
}
.guide-overview-title { margin: 0 0 12px; font-size: 1.15rem; }
.guide-overview-list { margin: 0; padding-left: 1.2rem; }
.guide-overview-list a { color: var(--green-dark); font-weight: 600; text-decoration: none; }
.guide-overview-list a:hover { text-decoration: underline; }

.guide-carousel {
  margin-bottom: 40px;
}
.guide-carousel-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}
.guide-carousel-status {
  margin: 0;
  font-weight: 700;
  color: var(--charcoal);
}
.guide-carousel-dots {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.guide-carousel-dot {
  width: 12px;
  height: 12px;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: #cbd5e1;
  cursor: pointer;
}
.guide-carousel-dot[aria-current="true"] {
  background: var(--green-dark);
}
.guide-carousel-dot:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}
.guide-carousel-viewport {
  overflow: hidden;
}
.guide-carousel-track {
  position: relative;
}
.guide-slide {
  display: none;
  margin-bottom: 0;
}
.guide-slide.is-active {
  display: block;
}
.guide-carousel-nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
}
.guide-carousel-nav .button { justify-self: start; }
.guide-carousel-nav .button:last-of-type { justify-self: end; }
.guide-carousel-nav .button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.guide-step {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px;
  margin-bottom: 28px;
  box-shadow: 0 12px 32px rgba(15, 23, 32, 0.05);
  scroll-margin-top: 24px;
}
.guide-step h2 {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 0;
  font-size: clamp(1.25rem, 2.5vw, 1.65rem);
}
.guide-step h3 { margin-top: 24px; color: var(--charcoal); }
.guide-step-number {
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--green-dark);
  color: #fff;
  font-weight: 800;
  font-size: 1rem;
}
.guide-figure { margin: 22px 0 12px; text-align: center; }
.guide-image-button {
  display: inline-block;
  max-width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: zoom-in;
  border-radius: 12px;
  position: relative;
  text-align: center;
}
.guide-image-button:focus-visible {
  outline: 3px solid var(--green);
  outline-offset: 4px;
}
.guide-screenshot {
  display: block;
  width: auto;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  object-fit: contain;
}
.guide-figure-phone .guide-screenshot { max-width: min(360px, 100%); }
.guide-figure-wide .guide-screenshot-wide { max-width: min(960px, 100%); }
.guide-enlarge-hint {
  display: block;
  margin-top: 8px;
  text-align: center;
  color: var(--muted);
  font-size: .9rem;
}
.guide-figure figcaption {
  text-align: center;
  color: var(--muted);
  font-size: .93rem;
  margin-top: 8px;
}
.guide-note, .guide-warning {
  border-radius: 12px;
  padding: 14px 16px;
  margin-top: 16px;
}
.guide-note { background: #eff6ff; border-left: 4px solid var(--info); }
.guide-warning { background: #fff8df; border-left: 4px solid #d89a00; }
.guide-table-wrap { overflow-x: auto; margin-top: 18px; }
.guide-options-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}
.guide-options-table th,
.guide-options-table td {
  padding: 12px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
.guide-options-table th { background: #ecfdf5; }
.guide-step-nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.guide-step-nav .button { justify-self: start; }
.guide-step-nav .button:last-child { justify-self: end; }
.guide-back-top {
  justify-self: center;
  color: var(--green-dark);
  font-weight: 600;
  text-decoration: none;
}
.guide-back-top:hover { text-decoration: underline; }
.guide-back-top:focus-visible { outline: 2px solid var(--green); outline-offset: 2px; }
.guide-finish { font-size: 1.08rem; margin-top: 18px; }
.guide-faq {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 2px solid var(--line);
}
.guide-faq-list { margin: 0; }
.guide-faq-list div {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 20px;
  margin-bottom: 14px;
}
.guide-faq-list dt { font-weight: 700; color: var(--charcoal); margin-bottom: 8px; }
.guide-faq-list dd { margin: 0; color: #475569; }
.guide-footer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 36px;
}
.guide-lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(15, 23, 32, 0.88);
}
.guide-lightbox[hidden] { display: none !important; }
body.guide-lightbox-open { overflow: hidden; }
.guide-lightbox-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 999px;
  background: #fff;
  color: var(--charcoal);
  font-size: 1.75rem;
  line-height: 1;
  cursor: pointer;
}
.guide-lightbox-close:focus-visible { outline: 3px solid var(--green); outline-offset: 2px; }
.guide-lightbox-image {
  max-width: min(1200px, 100%);
  max-height: calc(100vh - 48px);
  width: auto;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

@media (max-width: 900px) {
  .hero-grid, .feature-grid, .how-to-use-grid { grid-template-columns: 1fr; }
  nav { display: none; }
  .header-inner, .footer-inner { flex-direction: column; align-items: flex-start; }
  .form-row { flex-direction: column; }
  .form-row .button { width: 100%; }
  .guide-step-nav { grid-template-columns: 1fr; }
  .guide-step-nav .button,
  .guide-step-nav .button:last-child { justify-self: stretch; width: 100%; }
  .guide-carousel-nav { grid-template-columns: 1fr; }
  .guide-carousel-nav .button,
  .guide-carousel-nav .button:last-of-type { justify-self: stretch; width: 100%; }
  .guide-back-top { justify-self: center; }
}