:root {
    --bg: #f4f8ff;
    --card: rgba(255, 255, 255, 0.9);
    --line: #dbeafe;
    --text: #1e293b;
    --muted: #475569;
    --blue: #2563eb;
    --blue-dark: #1d4ed8;
    --violet: #8b5cf6;
    --shadow: 0 18px 48px rgba(37, 99, 235, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: "Quicksand", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(147, 197, 253, 0.28), transparent 28%),
        linear-gradient(180deg, #eef6ff 0%, #ffffff 100%);
    line-height: 1.75;
}
a {
    color: var(--blue);
    text-decoration: none;
}
a:hover { color: var(--blue-dark); }
.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(16px);
    background: rgba(255, 255, 255, 0.78);
    border-bottom: 1px solid rgba(219, 234, 254, 0.9);
}
.topbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 0;
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-weight: 700;
}
.brand img {
    width: 36px;
    height: 24px;
    object-fit: contain;
}
.top-links {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}
.top-links a {
    font-size: 0.92rem;
    color: var(--muted);
    font-weight: 600;
}

.hero {
    padding: 72px 0 28px;
}
.hero-card,
.section-card {
    background: var(--card);
    border: 1px solid rgba(219, 234, 254, 0.95);
    border-radius: 28px;
    box-shadow: var(--shadow);
}
.hero-card {
    padding: 40px;
}
.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    color: var(--muted);
    font-size: 0.9rem;
}
.breadcrumb a {
    color: var(--blue);
    font-weight: 700;
}
.breadcrumb-sep {
    color: #94a3b8;
}
.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border-radius: 999px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(139, 92, 246, 0.12));
    color: var(--blue-dark);
    font-size: 0.9rem;
    font-weight: 700;
}
h1 {
    margin: 18px 0 14px;
    font-size: clamp(2rem, 4vw, 3.2rem);
    line-height: 1.2;
}
.hero-lead {
    margin: 0;
    font-size: 1.04rem;
    color: var(--muted);
    max-width: 860px;
}
.hero-keywords,
.chip-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}
.hero-keywords span,
.chip-row span {
    display: inline-flex;
    align-items: center;
    padding: 8px 14px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--line);
    color: var(--blue-dark);
    font-weight: 700;
    font-size: 0.86rem;
}
.cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 24px;
}
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: 999px;
    font-weight: 700;
    border: 1px solid transparent;
}
.btn-primary {
    background: linear-gradient(135deg, var(--blue), var(--violet));
    color: #fff;
}
.btn-secondary {
    background: #fff;
    color: var(--blue-dark);
    border-color: var(--line);
}

.section {
    padding: 16px 0;
}
.section-card {
    padding: 28px;
}
.section-label {
    margin: 0 0 10px;
    color: var(--blue);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.86rem;
}
h2 {
    margin: 0 0 10px;
    font-size: 1.5rem;
}
.section-desc {
    margin: 0;
    color: var(--muted);
}

.grid-3,
.grid-2 {
    display: grid;
    gap: 14px;
    margin-top: 22px;
}
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.mini-card {
    padding: 18px;
    border-radius: 22px;
    background: linear-gradient(180deg, #ffffff, #f8fbff);
    border: 1px solid var(--line);
}
.mini-card h3 {
    margin: 0 0 8px;
    font-size: 1.05rem;
}
.mini-card p,
.mini-card li,
.section-card li {
    color: var(--muted);
}
.step-list {
    margin: 18px 0 0;
    padding-left: 22px;
}
.faq-list {
    display: grid;
    gap: 12px;
    margin-top: 22px;
}
.faq-item {
    padding: 18px 18px 16px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid var(--line);
}
.faq-item h3 {
    margin: 0 0 8px;
    font-size: 1rem;
}
.faq-item p {
    margin: 0;
    color: var(--muted);
}
.related-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}
.related-links a {
    display: inline-flex;
    align-items: center;
    padding: 10px 14px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--line);
    font-weight: 700;
}

.footer {
    padding: 28px 0 48px;
    color: var(--muted);
    text-align: center;
}

@media (max-width: 900px) {
    .grid-3,
    .grid-2 {
        grid-template-columns: 1fr;
    }
    .hero-card,
    .section-card {
        padding: 24px;
    }
}

@media (max-width: 640px) {
    .hero {
        padding-top: 36px;
    }
    .topbar-inner {
        flex-direction: column;
        align-items: flex-start;
    }
    .cta-row,
    .related-links {
        flex-direction: column;
    }
    .btn,
    .related-links a {
        width: 100%;
    }
}