:root {
    --primary: #3a6ea5;
    --primary-hover: #2c5580;
    --primary-rgb: 58, 110, 165;
    --bg-page: #f4f6f9;
    --bg-card: #ffffff;
    --bg-alt: #eef1f6;
    --bg-dark: #1b2733;
    --text-main: #1f2933;
    --text-muted: #5c6b7a;
    --text-soft: #8695a7;
    --border-color: #dde3ea;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg-page);
    color: var(--text-main);
    line-height: 1.7;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; }

/* Navbar */
.navbar {
    position: sticky; top: 0; width: 100%; z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    display: flex; justify-content: space-between; align-items: center;
    padding: 0 5%; height: 68px;
}
.nav-brand { font-size: 20px; font-weight: 700; color: var(--text-main); display: flex; align-items: center; gap: 10px; }
.nav-brand .brand-mark { color: var(--primary); }
.nav-links { display: flex; gap: 28px; }
.nav-links a { font-weight: 500; font-size: 15px; color: var(--text-muted); transition: color 0.2s; }
.nav-links a:hover { color: var(--primary); }
.menu-toggle { display: none; font-size: 26px; cursor: pointer; color: var(--text-main); background: none; border: none; }
.nav-menu-wrapper { display: flex; align-items: center; gap: 28px; }
.nav-actions .btn { padding: 8px 18px; font-size: 14px; }

/* Buttons */
.btn { display: inline-block; padding: 11px 24px; border-radius: 8px; font-weight: 600; text-align: center; transition: all 0.2s; cursor: pointer; border: 1px solid transparent; font-size: 15px; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-outline { border: 1px solid var(--border-color); color: var(--text-main); background: transparent; }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

/* Layout helpers */
.container { max-width: 1080px; margin: 0 auto; padding: 0 5%; }
section { padding: 70px 5%; }

/* Hero */
.hero {
    background: linear-gradient(180deg, #eef2f8 0%, var(--bg-page) 100%);
    border-bottom: 1px solid var(--border-color);
    padding: 90px 5% 60px;
    text-align: center;
}
.hero-tag {
    display: inline-block; background: rgba(var(--primary-rgb), 0.1); color: var(--primary);
    padding: 6px 16px; border-radius: 20px; font-size: 13px; font-weight: 600; margin-bottom: 22px;
    border: 1px solid rgba(var(--primary-rgb), 0.25);
}
.hero h1 { font-size: 40px; line-height: 1.35; margin-bottom: 18px; color: var(--text-main); max-width: 760px; margin-inline: auto; }
.hero p { font-size: 17px; color: var(--text-muted); max-width: 640px; margin: 0 auto 10px; }
.hero-meta { font-size: 13px; color: var(--text-soft); margin-top: 18px; }

/* Section headings */
.section-heading { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 30px; max-width: 1080px; margin-inline: auto; padding: 0 5%; }
.section-heading h2 { font-size: 24px; color: var(--text-main); }
.section-heading span { font-size: 14px; color: var(--text-soft); }

/* Article list / cards */
.article-list { max-width: 1080px; margin: 0 auto 60px; padding: 0 5%; display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.article-card {
    background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px;
    padding: 28px; transition: box-shadow 0.2s, transform 0.2s; display: flex; flex-direction: column;
}
.article-card:hover { box-shadow: 0 8px 24px rgba(30, 41, 59, 0.08); transform: translateY(-3px); }
.article-tag { display: inline-block; font-size: 12px; color: var(--primary); background: rgba(var(--primary-rgb), 0.08); padding: 3px 10px; border-radius: 6px; margin-bottom: 12px; width: fit-content; }
.article-card h3 { font-size: 19px; margin-bottom: 10px; line-height: 1.4; }
.article-card h3 a { color: var(--text-main); }
.article-card h3 a:hover { color: var(--primary); }
.article-card p { color: var(--text-muted); font-size: 14.5px; margin-bottom: 16px; flex-grow: 1; }
.read-more { font-size: 14px; font-weight: 600; color: var(--primary); }

/* Ad / recommendation card */
.promo-card {
    max-width: 1080px; margin: 0 auto 60px; padding: 0 5%;
}
.promo-card-inner {
    background: linear-gradient(120deg, #26405c 0%, #3a6ea5 100%);
    border-radius: 16px; padding: 40px; color: #fff;
    display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap;
}
.promo-card-inner .promo-text { flex: 1; min-width: 260px; }
.promo-card-inner .promo-label { display: inline-block; font-size: 12px; letter-spacing: 0.5px; text-transform: uppercase; background: rgba(255,255,255,0.15); padding: 4px 10px; border-radius: 6px; margin-bottom: 12px; }
.promo-card-inner h3 { font-size: 22px; margin-bottom: 10px; }
.promo-card-inner p { color: rgba(255,255,255,0.85); font-size: 14.5px; margin-bottom: 6px; }
.promo-card-inner .promo-code { font-family: monospace; background: rgba(255,255,255,0.15); padding: 2px 8px; border-radius: 4px; font-weight: bold; }
.promo-card-inner .btn-primary { background: #fff; color: #26405c; white-space: nowrap; }
.promo-card-inner .btn-primary:hover { background: #eef2f8; }
.promo-fineprint { font-size: 12px; color: var(--text-soft); margin-top: 10px; padding: 0 5%; max-width: 1080px; margin-inline: auto; }

/* Inline promo (end of article) */
.inline-promo {
    background: var(--bg-alt); border: 1px solid var(--border-color); border-left: 4px solid var(--primary);
    border-radius: 10px; padding: 26px 28px; margin: 40px 0;
}
.inline-promo h4 { font-size: 17px; margin-bottom: 8px; color: var(--text-main); }
.inline-promo p { font-size: 14.5px; color: var(--text-muted); margin-bottom: 14px; }
.inline-promo .promo-code { font-family: monospace; background: rgba(var(--primary-rgb), 0.1); color: var(--primary); padding: 2px 8px; border-radius: 4px; font-weight: bold; }

/* Article page typography */
.article-wrap { max-width: 760px; margin: 0 auto; padding: 50px 5% 80px; }
.breadcrumb { font-size: 13px; color: var(--text-soft); margin-bottom: 20px; }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.article-wrap h1 { font-size: 32px; line-height: 1.4; margin-bottom: 16px; color: var(--text-main); }
.article-meta { font-size: 13px; color: var(--text-soft); margin-bottom: 34px; padding-bottom: 24px; border-bottom: 1px solid var(--border-color); }
.article-body h2 { font-size: 22px; margin: 36px 0 16px; color: var(--text-main); }
.article-body h3 { font-size: 18px; margin: 26px 0 12px; color: var(--text-main); }
.article-body p { font-size: 16px; color: #374151; margin-bottom: 18px; }
.article-body ul, .article-body ol { padding-left: 22px; margin-bottom: 18px; color: #374151; }
.article-body li { margin-bottom: 8px; }
.article-body a { color: var(--primary); text-decoration: underline; }
.article-body table { width: 100%; border-collapse: collapse; margin: 20px 0 30px; font-size: 14.5px; }
.article-body th, .article-body td { border: 1px solid var(--border-color); padding: 10px 12px; text-align: left; }
.article-body th { background: var(--bg-alt); }
.summary-box {
    background: var(--bg-alt); border-radius: 10px; padding: 20px 24px; margin-bottom: 30px; font-size: 15px; color: var(--text-main);
}
.summary-box strong { color: var(--primary); }

/* Subpage (about / privacy / terms / sitemap) */
.subpage-header { padding: 100px 5% 50px; text-align: center; background: linear-gradient(180deg, #eef2f8 0%, var(--bg-page) 100%); border-bottom: 1px solid var(--border-color); }
.subpage-header h1 { font-size: 32px; margin-bottom: 12px; }
.subpage-header p { color: var(--text-muted); font-size: 15px; }
.subpage-content { padding: 60px 5%; max-width: 760px; margin: 0 auto; color: #374151; font-size: 16px; }
.subpage-content h2 { color: var(--text-main); margin: 34px 0 16px; font-size: 21px; }
.subpage-content p { margin-bottom: 16px; }
.subpage-content ul { padding-left: 20px; margin-bottom: 16px; list-style: disc; }
.subpage-content li { margin-bottom: 8px; }

/* Footer */
footer { border-top: 1px solid var(--border-color); padding: 50px 5% 36px; background: var(--bg-dark); color: #cbd5e1; text-align: center; }
.footer-logo { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 24px; }
.footer-links { display: flex; justify-content: center; gap: 34px; margin-bottom: 30px; flex-wrap: wrap; }
.footer-links a { color: #cbd5e1; transition: color 0.2s; font-size: 14.5px; }
.footer-links a:hover { color: #fff; }
.footer-friends { margin-bottom: 22px; font-size: 13.5px; color: #94a3b8; }
.footer-friends a { color: #94a3b8; transition: color 0.2s; margin: 0 8px; }
.footer-friends a:hover { color: #fff; }
.footer-copy { color: #64748b; font-size: 13px; }

/* Mobile */
@media (max-width: 768px) {
    .nav-menu-wrapper { display: none; flex-direction: column; position: absolute; top: 68px; left: 0; width: 100%; background: #fff; padding: 24px 20px; border-bottom: 1px solid var(--border-color); gap: 18px; }
    .nav-menu-wrapper.active { display: flex; }
    .menu-toggle { display: block; }
    .nav-links { flex-direction: column; gap: 16px; text-align: center; width: 100%; }
    .hero h1 { font-size: 28px; }
    .hero p { font-size: 15px; }
    .article-list { grid-template-columns: 1fr; }
    .promo-card-inner { flex-direction: column; text-align: center; padding: 30px; }
    .footer-links { gap: 16px; flex-direction: column; }
    section { padding: 50px 5%; }
    .article-wrap h1 { font-size: 24px; }
}