:root {
--bg: #0f172a;
--panel: #111827;
--panel-soft: #f8fafc;
--text: #0f172a;
--text-soft: #475569;
--line: #e2e8f0;
--white: #ffffff;
--primary: #2563eb;
--primary-hover: #1d4ed8;
--secondary: #0f172a;
--shadow: 0 16px 50px rgba(15, 23, 42, 0.12);
--radius: 18px;
--container: 1120px;
--header-h: 72px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
margin: 0;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
color: var(--text);
background: var(--white);
line-height: 1.7;
text-rendering: optimizeLegibility;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}

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

a {
color: inherit;
text-decoration: none;
}

code {
padding: 0.15rem 0.4rem;
border-radius: 8px;
background: #eef2ff;
color: #1e3a8a;
}

.skip-link {
position: absolute;
left: 12px;
top: -48px;
padding: 10px 14px;
background: var(--primary);
color: #fff;
border-radius: 10px;
z-index: 9999;
}

.skip-link:focus {
top: 12px;
}

.container {
width: min(100% - 32px, var(--container));
margin: 0 auto;
}

.narrow {
width: min(100%, 840px);
}

.site-header {
position: sticky;
top: 0;
z-index: 50;
min-height: var(--header-h);
background: rgba(255,255,255,0.88);
backdrop-filter: blur(14px);
border-bottom: 1px solid rgba(226, 232, 240, 0.9);
}

.header-wrap {
min-height: var(--header-h);
display: flex;
align-items: center;
justify-content: space-between;
gap: 16px;
}

.brand {
display: inline-flex;
align-items: center;
gap: 12px;
font-weight: 700;
}

.site-nav {
display: flex;
align-items: center;
gap: 28px;
}

.site-nav a {
color: var(--text-soft);
font-weight: 500;
}

.site-nav a:hover,
.site-nav a:focus-visible {
color: var(--primary);
}

.menu-toggle {
display: none;
border: 0;
background: transparent;
width: 42px;
height: 42px;
padding: 0;
cursor: pointer;
}

.menu-toggle span {
display: block;
width: 22px;
height: 2px;
margin: 5px auto;
background: var(--text);
transition: 0.25s ease;
}

.menu-toggle.is-open span:nth-child(1) {
transform: translateY(7px) rotate(45deg);
}

.menu-toggle.is-open span:nth-child(2) {
opacity: 0;
}

.menu-toggle.is-open span:nth-child(3) {
transform: translateY(-7px) rotate(-45deg);
}

.hero {
padding: 64px 0 48px;
background:
radial-gradient(circle at top left, rgba(37,99,235,0.14), transparent 32%),
linear-gradient(180deg, #f8fbff 0%, #ffffff 100%);
}

.hero-grid {
display: grid;
grid-template-columns: 1.05fr 0.95fr;
align-items: center;
gap: 48px;
}

.eyebrow {
margin: 0 0 10px;
color: var(--primary);
font-weight: 700;
letter-spacing: .04em;
text-transform: uppercase;
font-size: .9rem;
}

.hero h1 {
margin: 0;
font-size: clamp(2rem, 4vw, 3.6rem);
line-height: 1.08;
}

.hero-text {
margin: 18px 0 0;
color: var(--text-soft);
font-size: 1.05rem;
}

.hero-actions {
display: flex;
gap: 14px;
flex-wrap: wrap;
margin-top: 28px;
}

.hero-points {
margin: 26px 0 0;
padding: 0;
list-style: none;
color: var(--text-soft);
}

.hero-points li {
margin: 8px 0;
position: relative;
padding-left: 22px;
}

.hero-points li::before {
content: "✓";
position: absolute;
left: 0;
top: 0;
color: #16a34a;
font-weight: 700;
}

.hero-media {
background: linear-gradient(180deg, #ffffff, #eef4ff);
border: 1px solid rgba(226, 232, 240, 0.9);
border-radius: 28px;
box-shadow: var(--shadow);
padding: 20px;
}

.btn {
display: inline-flex;
align-items: center;
justify-content: center;
min-height: 48px;
padding: 0 18px;
border-radius: 999px;
font-weight: 700;
border: 1px solid transparent;
transition: 0.2s ease;
}

.btn-primary {
background: var(--primary);
color: var(--white);
}

.btn-primary:hover,
.btn-primary:focus-visible {
background: var(--primary-hover);
transform: translateY(-1px);
}

.btn-secondary {
border-color: var(--line);
background: var(--white);
}.btn-secondary:hover,
.btn-secondary:focus-visible {
border-color: var(--primary);
color: var(--primary);
}

.section {
padding: 72px 0;
}

.section-alt {
background: var(--panel-soft);
}

.section-head {
margin-bottom: 28px;
}

.section h2,
.section-head h2 {
margin: 0 0 10px;
font-size: clamp(1.6rem, 3vw, 2.4rem);
line-height: 1.2;
}

.section p,
.section-head p {
color: var(--text-soft);
}

.card-grid {
display: grid;
grid-template-columns: repeat(3, minmax(0, 1fr));
gap: 20px;
}

.card {
padding: 24px;
border-radius: var(--radius);
background: var(--white);
border: 1px solid var(--line);
box-shadow: 0 10px 24px rgba(15, 23, 42, 0.05);
}

.card h3 {
margin: 0 0 10px;
font-size: 1.1rem;
}

.card p {
margin: 0;
}

.faq-list {
display: grid;
gap: 14px;
}

.faq-item {
border: 1px solid var(--line);
border-radius: 16px;
background: #fff;
overflow: hidden;
}

.faq-item summary {
cursor: pointer;
list-style: none;
padding: 18px 20px;
font-weight: 700;
}

.faq-item summary::-webkit-details-marker {
display: none;
}

.faq-body {
padding: 0 20px 18px;
color: var(--text-soft);
}

.site-footer {
padding: 24px 0 36px;
border-top: 1px solid var(--line);
}

.footer-wrap {
display: flex;
align-items: center;
justify-content: space-between;
gap: 16px;
color: var(--text-soft);
}

.reveal {
opacity: 0;
transform: translateY(18px);
transition: opacity 0.45s ease, transform 0.45s ease;
}

.reveal.is-visible {
opacity: 1;
transform: translateY(0);
}

@media (max-width: 860px) {
.menu-toggle {
display: inline-block;
}

.site-nav {
position: absolute;
left: 16px;
right: 16px;
top: calc(var(--header-h) - 6px);
display: none;
flex-direction: column;
align-items: flex-start;
gap: 14px;
padding: 16px;
background: rgba(255,255,255,0.98);
border: 1px solid var(--line);
border-radius: 18px;
box-shadow: var(--shadow);
}

.site-nav.is-open {
display: flex;
}

.hero-grid,
.card-grid {
grid-template-columns: 1fr;
}

.hero {
padding-top: 42px;
}

.footer-wrap {
flex-direction: column;
align-items: flex-start;
}
}

@media (prefers-reduced-motion: reduce) {
html {
scroll-behavior: auto;
}

*,
*::before,
*::after {
animation: none !important;
transition: none !important;
}

.reveal,
.reveal.is-visible {
opacity: 1;
transform: none;
}
}