:root {
    --bg: #081018;
    --surface: #122030;
    --surface-hover: #1a2d42;
    --accent: #60a5fa;
    --accent-hover: #3b82f6;
    --accent2: #fbbf24;
    --text: #f0f6ff;
    --muted: #8fa0b8;
    --border: #1e3650;
    --font-display: 'Anton', sans-serif;
    --font-body: 'Barlow', sans-serif;
    --radius: 8px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background-color: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-hover); }
img { max-width: 100%; height: auto; display: block; }

/* Layout */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}
.content-grid {
    max-width: 840px;
    margin: 0 auto;
    padding: 3rem 20px;
}

/* Typography */
h1, h2, h3, .logo {
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: normal;
    line-height: 1.2;
}
h1 { font-size: 2.5rem; color: var(--text); margin-bottom: 1rem; }
h2 { font-size: 2rem; color: var(--accent2); margin-top: 2.5rem; margin-bottom: 1.25rem; border-bottom: 1px solid var(--border); padding-bottom: 0.5rem;}
h3 { font-size: 1.5rem; margin-bottom: 1rem; }
p { margin-bottom: 1.25rem; color: var(--text); font-size: 1.05rem; }
p a { font-weight: 600; text-decoration: underline; text-decoration-color: var(--border); text-underline-offset: 4px; }
p a:hover { text-decoration-color: var(--accent); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--radius);
    font-family: var(--font-display);
    font-size: 1.1rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    text-decoration: none;
    min-height: 44px;
}
.btn-primary {
    background-color: var(--accent);
    color: var(--bg);
}
.btn-primary:hover {
    background-color: var(--accent-hover);
    color: var(--bg);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(96, 165, 250, 0.3);
}
.btn-secondary {
    background-color: transparent;
    border-color: var(--border);
    color: var(--text);
}
.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* --- HEADER (Part A1 styles) --- */
header {
    background-color: rgba(8, 16, 24, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}
.logo { font-size: 2rem; color: var(--accent2); display: flex; align-items: center; gap: 8px; }
.nav-links { display: none; gap: 24px; }
.nav-links a { color: var(--text); font-weight: 500; font-size: 1rem; text-transform: uppercase; letter-spacing: 1px; }
.nav-links a:hover { color: var(--accent); }
.header-ctas { display: none; gap: 12px; }
.mobile-toggle {
    background: none; border: none; color: var(--text); font-size: 1.8rem; cursor: pointer; display: block; min-width: 44px; min-height: 44px;
}
.mobile-menu {
    display: none; background-color: var(--surface); padding: 20px; border-top: 1px solid var(--border); flex-direction: column; gap: 15px;
}
.mobile-menu.active { display: flex; }
.mobile-menu a { color: var(--text); font-size: 1.1rem; font-weight: 500; text-transform: uppercase; padding: 10px 0; border-bottom: 1px solid var(--border); }

/* --- HERO BANNER --- */
.hero {
    background: linear-gradient(180deg, var(--surface) 0%, var(--bg) 100%);
    padding: 4rem 20px 3rem;
    text-align: center;
    border-bottom: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(circle at 50% 0%, rgba(96, 165, 250, 0.1) 0%, transparent 70%);
    pointer-events: none;
}
.breadcrumb {
    font-size: 0.9rem;
    color: var(--muted);
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.meta-chips {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}
.chip {
    background-color: var(--surface);
    border: 1px solid var(--border);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--muted);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* --- CONTENT STYLES --- */
.intro-box {
    background-color: var(--surface);
    border-left: 4px solid var(--accent);
    padding: 1.5rem 2rem;
    border-radius: 0 var(--radius) var(--radius) 0;
    margin-bottom: 3rem;
    font-size: 1.15rem;
    color: var(--text);
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

/* Step List */
.step-list {
    list-style: none;
    counter-reset: custom-counter;
    margin: 2rem 0;
}
.step-list li {
    position: relative;
    padding-left: 3.5rem;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    background: var(--surface);
    padding: 1.25rem 1.25rem 1.25rem 4rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}
.step-list li::before {
    counter-increment: custom-counter;
    content: counter(custom-counter);
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    background-color: var(--accent2);
    color: var(--bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 1.2rem;
}

/* Feature Cards (for sections) */
.content-section { margin-bottom: 3rem; }
.info-card {
    background: linear-gradient(145deg, var(--surface), #0b1520);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-top: 1.5rem;
}

/* FAQ */
.faq-wrapper { margin-top: 4rem; }
details {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 1rem;
    overflow: hidden;
    transition: var(--transition);
}
details[open] { border-color: var(--accent); box-shadow: 0 4px 12px rgba(0,0,0,0.3); }
summary {
    padding: 1.25rem;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
summary::-webkit-details-marker { display: none; }
summary::after {
    content: '+';
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--accent);
    transition: transform 0.3s ease;
}
details[open] summary::after { transform: rotate(45deg); color: var(--accent2); }
details p { padding: 0 1.25rem 1.25rem; margin-bottom: 0; color: var(--muted); }

/* Related Links */
.related-nav {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px dashed var(--border);
}
.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}
.related-grid a {
    display: block;
    background-color: var(--surface);
    border: 1px solid var(--border);
    padding: 1rem;
    border-radius: var(--radius);
    text-align: center;
    font-weight: 500;
    text-transform: capitalize;
}
.related-grid a:hover {
    background-color: var(--surface-hover);
    border-color: var(--accent);
    transform: translateY(-2px);
}

/* Final CTA */
.cta-block {
    background: linear-gradient(135deg, #122030 0%, #1a365d 100%);
    border: 1px solid #2c5282;
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    margin: 4rem 0;
    position: relative;
    overflow: hidden;
}
.cta-block::after {
    content: '';
    position: absolute;
    right: -10%; top: -20%;
    width: 300px; height: 300px;
    background: radial-gradient(circle, rgba(251, 191, 36, 0.1) 0%, transparent 70%);
}
.cta-block h2 { border: none; margin-top: 0; padding-bottom: 0; font-size: 2.5rem; color: #fff; }
.cta-block p { font-size: 1.2rem; margin-bottom: 2rem; color: var(--text); }
.cta-actions { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; }

/* --- FOOTER (Part A2 styles) --- */
footer {
    background-color: var(--surface);
    border-top: 1px solid var(--border);
    padding: 4rem 0 2rem;
    text-align: center;
}
.footer-brand { font-family: var(--font-display); font-size: 2.5rem; color: var(--accent2); margin-bottom: 1rem; text-transform: uppercase; }
.footer-tagline { color: var(--muted); margin-bottom: 2rem; font-size: 1rem; max-width: 600px; margin-left: auto; margin-right: auto; }
.footer-links {
    display: flex; flex-wrap: wrap; justify-content: center; gap: 15px 25px; margin-bottom: 3rem; max-width: 900px; margin-left: auto; margin-right: auto;
}
.footer-links a { color: var(--text); font-size: 0.95rem; }
.footer-links a:hover { color: var(--accent); }
.footer-copy { color: var(--muted); font-size: 0.85rem; border-top: 1px solid var(--border); padding-top: 2rem; }

/* Breakpoints */
@media (min-width: 768px) {
    h1 { font-size: 3.5rem; }
    .hero { padding: 5rem 20px 4rem; }
    .nav-links { display: flex; }
    .header-ctas { display: flex; }
    .mobile-toggle { display: none; }
    .cta-actions { flex-direction: row; }
}
@media (min-width: 1024px) {
    .content-grid { padding: 4rem 20px; }
}


/* pipeline image & layout guards */
html, body { overflow-x: clip; }
img { max-width: 100%; height: auto; }
img.site-logo { height: 40px; width: auto; max-width: 240px; object-fit: contain; flex: none; }
header .logo a { display: inline-flex; align-items: center; flex: none; text-decoration: none; }
img.hero-visual { width: 100%; max-width: 560px; height: auto; object-fit: cover; border-radius: 16px; display: block; margin-inline: auto; }
img[class^="strip-"], img[class*=" strip-"] { width: 100%; height: auto; display: block; border-radius: 12px; object-fit: cover; }
/* 合规声明块（zb-disclaimer，全站 footer） */
.zb-disclaimer { margin-top: 18px !important; padding: 14px 0 0 0 !important; border-top: 1px solid rgba(128,128,128,.25) !important; font-size: .72rem !important; line-height: 1.7 !important; opacity: .85 !important; display: block !important; text-align: left !important; width: 100% !important; clear: both !important; }
.zb-disclaimer .zb-18 { display: inline-block !important; padding: 2px 10px !important; border: 1.5px solid currentColor !important; border-radius: 6px !important; font-weight: 800 !important; letter-spacing: 1px !important; margin: 0 0 10px 0 !important; font-size: .78rem !important; }
.zb-disclaimer p { display: block !important; margin: 5px 0 !important; padding: 0 !important; color: inherit !important; font-size: .72rem !important; line-height: 1.7 !important; }
.zb-disclaimer p:last-child { margin-bottom: 0 !important; }