:root {
  --bg: #ffffff;
  --bg-soft: #f5f7fa;
  --bg-elevated: #ffffff;
  --surface: #eef2f6;
  --text: #152033;
  --muted: #5b6b7c;
  --accent: #1f6feb;
  --accent-deep: #1557c0;
  --accent-soft: rgba(31, 111, 235, 0.1);
  --warn: #b45309;
  --warn-bg: #fff7ed;
  --warn-border: #fdba74;
  --line: rgba(21, 32, 51, 0.1);
  --shadow: 0 14px 40px rgba(21, 32, 51, 0.08);
  --font-display: "Syne", "Segoe UI", sans-serif;
  --font-body: "DM Sans", "Segoe UI", sans-serif;
  --radius: 14px;
  --header-h: 68px;
  --float-h: 64px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background:
    radial-gradient(1000px 480px at 12% -8%, rgba(31, 111, 235, 0.1), transparent 55%),
    radial-gradient(800px 420px at 92% 0%, rgba(14, 165, 233, 0.08), transparent 50%),
    linear-gradient(180deg, #ffffff 0%, var(--bg-soft) 55%, #ffffff 100%);
  line-height: 1.65;
  min-height: 100vh;
}

img {
  max-width: 100%;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 1000;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.wrap {
  width: min(1080px, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: 1rem;
}

.logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--text);
  text-decoration: none;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav a {
  color: var(--muted);
  font-size: 0.95rem;
  text-decoration: none;
}

.nav a:hover {
  color: var(--text);
}

.nav-cta {
  color: #fff !important;
  background: var(--accent);
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  font-weight: 700;
}

.nav-cta:hover {
  background: var(--accent-deep);
  text-decoration: none;
}

.hero {
  position: relative;
  min-height: calc(100vh - var(--header-h));
  display: grid;
  align-items: start;
  padding-top: 3rem;
  overflow: hidden;
  isolation: isolate;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, transparent 30%, rgba(255, 255, 255, 0.92) 100%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160' viewBox='0 0 160 160'%3E%3Cg fill='none' stroke='%231f6feb' stroke-opacity='0.1'%3E%3Cpath d='M0 80h160M80 0v160'/%3E%3Ccircle cx='80' cy='80' r='36'/%3E%3C/g%3E%3C/svg%3E"),
    linear-gradient(135deg, #f8fbff 0%, #ffffff 42%, #eef6ff 100%);
  background-size: cover, 120px 120px, cover;
  transform: scale(1.04);
  animation: heroDrift 14s ease-in-out infinite alternate;
}

@keyframes heroDrift {
  from { transform: scale(1.04) translate3d(0, 0, 0); }
  to { transform: scale(1.08) translate3d(-1.5%, 1%, 0); }
}

.hero-content {
  padding: 1rem 0 3rem;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
  width: min(1080px, calc(100% - 2rem));
  animation: riseIn 0.9s ease both;
  text-align: center;
}

.hero-showcase {
  margin: 0 auto 1.75rem;
  max-width: min(380px, 82vw);
}

.hero-logo {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 auto;
  border-radius: calc(var(--radius) + 4px);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  object-fit: contain;
}

@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.brand {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.4rem, 7vw, 4.4rem);
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--text);
}

.hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.2vw, 2rem);
  letter-spacing: -0.02em;
  color: var(--accent);
}

.lead {
  margin: 0 auto 1.75rem;
  max-width: 42rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.75rem 1.25rem;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-deep);
}

.btn-ghost {
  background: #fff;
  color: var(--text);
  border-color: var(--line);
}

.btn-ghost:hover {
  border-color: rgba(31, 111, 235, 0.35);
  background: var(--accent-soft);
}

.btn-lg {
  padding: 0.9rem 1.45rem;
  font-size: 1rem;
}

.section {
  padding: 4.5rem 0;
}

.section-alt {
  background: rgba(245, 247, 250, 0.9);
  border-block: 1px solid var(--line);
}

.section h2 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  letter-spacing: -0.02em;
}

.section-desc {
  margin: 0 0 2rem;
  color: var(--muted);
  max-width: 40rem;
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
}

.steps li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.step-num {
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--accent);
  font-size: 1.25rem;
  line-height: 1.2;
}

.steps h3,
.method h3 {
  margin: 0 0 0.4rem;
  font-size: 1.15rem;
}

.steps p,
.method ol,
.method p {
  margin: 0;
  color: var(--muted);
}

.step-shot {
  margin: 1rem 0 0;
  padding: 0;
  max-width: 720px;
}

.step-shot img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, #f3f6fa 25%, transparent 25%) -10px 0 / 20px 20px,
    linear-gradient(225deg, #f3f6fa 25%, transparent 25%) -10px 0 / 20px 20px,
    linear-gradient(45deg, #f3f6fa 25%, transparent 25%) 0 0 / 20px 20px,
    linear-gradient(315deg, #f3f6fa 25%, #e8eef5 25%) 0 0 / 20px 20px;
  background-color: #eef2f6;
  object-fit: contain;
}

.step-shot figcaption {
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.step-shot code {
  font-size: 0.84em;
  color: var(--accent-deep);
  background: var(--accent-soft);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.method {
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--line);
}

.method:last-child {
  border-bottom: 0;
}

.method ol {
  padding-left: 1.2rem;
}

.method li + li {
  margin-top: 0.35rem;
}

.download-section .download-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.download-note {
  margin: 0;
  color: var(--warn);
  font-size: 0.92rem;
}

.disclaimer-box {
  border-left: 3px solid var(--accent);
  padding: 0.2rem 0 0.2rem 1.1rem;
}

.disclaimer-box p {
  margin: 0 0 0.85rem;
  color: var(--muted);
}

.disclaimer-box p:last-child {
  margin-bottom: 0;
}

.site-footer {
  padding: 2.5rem 0 calc(2.5rem + var(--float-h));
  border-top: 1px solid var(--line);
  background: #ffffff;
}

.footer-inner {
  text-align: center;
}

.footer-badge {
  margin: 0 0 0.85rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--warn-border);
  background: var(--warn-bg);
  color: #9a3412;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.01em;
}

.footer-stats {
  margin: 0 0 0.6rem;
  color: var(--muted);
}

.footer-stats strong {
  color: var(--text);
  font-weight: 700;
}

.footer-meta {
  margin: 0;
  color: #8090a0;
  font-size: 0.88rem;
}

.float-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 60;
  background: rgba(255, 255, 255, 0.96);
  border-top: 1px solid var(--line);
  box-shadow: 0 -8px 30px rgba(21, 32, 51, 0.06);
  backdrop-filter: blur(12px);
  transform: translateY(110%);
  transition: transform 0.28s ease;
}

.float-bar.is-visible {
  transform: translateY(0);
}

.float-inner {
  min-height: var(--float-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.float-inner span {
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 720px) {
  .nav a:not(.nav-cta) {
    display: none;
  }

  .hero-content {
    padding-top: 0.5rem;
    padding-bottom: 3rem;
  }

  .float-inner {
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem 0;
    text-align: center;
  }

  .float-inner .btn {
    width: 100%;
  }

  .site-footer {
    padding-bottom: calc(5.5rem + var(--float-h));
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-bg,
  .hero-content,
  .float-bar,
  .btn {
    animation: none !important;
    transition: none !important;
  }
}