:root {
    --primary: #40C6F2;
    --black: #111111;
    --dark: #1C1C1C;
    --mid: #2B2B2B;
    --light: #F5F5F5;
    --white: #ffffff;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Arial, Helvetica, sans-serif; background: var(--light); color: var(--black); line-height: 1.65; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
header, .site-header { background: linear-gradient(135deg, var(--primary), #ffffff); position: sticky; top: 0; z-index: 20; box-shadow: 0 8px 26px rgba(0,0,0,.08); }
.header-inner { max-width: 1180px; margin: 0 auto; padding: 12px 18px; display: grid; grid-template-columns: 48px 1fr 48px; align-items: center; gap: 10px; }
.logo { justify-self: center; display: inline-flex; align-items: center; }
.logo img { width: 130px; max-height: 54px; object-fit: contain; }
.main-nav, .header-actions { display: none; }
.mobile-menu-toggle { width: 44px; height: 44px; border: 0; border-radius: 14px; background: var(--black); color: #fff; font-size: 24px; cursor: pointer; }
.mobile-nav { display: none; padding: 8px 18px 18px; gap: 10px; background: #fff; box-shadow: inset 0 1px 0 rgba(0,0,0,.08); }
.mobile-nav.is-open { display: grid; }
.mobile-nav a { padding: 12px 14px; border-radius: 14px; background: var(--light); font-weight: 700; }
.mobile-actions { display: flex; justify-content: center; gap: 10px; padding: 0 18px 14px; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.hero, .banner { background: radial-gradient(circle at top right, rgba(255,255,255,.85), transparent 35%), linear-gradient(135deg, #101820, #1f2f3a); color: white; padding: 46px 0; }
.hero-grid { display: grid; gap: 28px; align-items: center; }
.hero h1 { font-size: clamp(2rem, 8vw, 4.2rem); line-height: 1.08; margin: 0 0 16px; }
.hero p { font-size: 1.05rem; max-width: 720px; color: rgba(255,255,255,.88); }
.tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0; }
.tag { background: rgba(64,198,242,.18); border: 1px solid rgba(255,255,255,.25); color: white; padding: 8px 12px; border-radius: 999px; font-weight: 700; }
section { padding: 42px 0; }
.section-title { font-size: clamp(1.6rem, 4vw, 2.4rem); margin: 0 0 14px; }
.grid { display: grid; gap: 18px; }
.card { background: #fff; border-radius: 20px; padding: 22px; box-shadow: 0 12px 34px rgba(0,0,0,.08); border: 1px solid rgba(0,0,0,.04); }
.card h2, .card h3 { margin-top: 0; }
.faq { display: grid; gap: 14px; }
.faq-item { background: #fff; border-radius: 18px; padding: 20px; box-shadow: 0 10px 28px rgba(0,0,0,.06); }
.btn { display: inline-flex; align-items: center; justify-content: center; border-radius: 999px; padding: 12px 22px; background: linear-gradient(135deg, var(--primary), #1fa3c9); color: #fff; font-weight: 800; box-shadow: 0 10px 24px rgba(0,0,0,.16); }
.btn-small { padding: 9px 18px; font-size: .95rem; }
.btn-alt { background: linear-gradient(135deg, #111, #333); }
.notice { background: #fff8df; border-left: 5px solid var(--primary); border-radius: 18px; padding: 18px; margin-top: 22px; }
.footer { background: var(--dark); color: white; padding: 36px 0; }
.footer-grid { display: grid; gap: 20px; }
.footer p { color: rgba(255,255,255,.78); }
.footer-nav { display: grid; gap: 8px; }
.footer-nav a { color: white; font-weight: 700; }
.article-links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.article-links a { padding: 8px 12px; border-radius: 999px; background: #fff; box-shadow: 0 6px 18px rgba(0,0,0,.08); }
@media (min-width: 768px) {
    .header-inner { grid-template-columns: 170px 1fr auto; padding: 14px 28px; }
    .mobile-menu-toggle, .mobile-nav, .mobile-actions { display: none; }
    .logo { justify-self: start; }
    .logo img { width: 150px; }
    .main-nav { display: flex; justify-content: center; gap: 8px; }
    .main-nav a { padding: 10px 12px; border-radius: 999px; font-weight: 800; }
    .main-nav a:hover { background: rgba(255,255,255,.5); }
    .header-actions { display: flex; gap: 10px; }
    .hero-grid { grid-template-columns: 1.1fr .9fr; }
    .grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1.5fr .7fr; }
}
@media (min-width: 1024px) {
    .header-inner { padding-left: 36px; padding-right: 36px; }
    .main-nav { gap: 16px; }
    .grid.three { grid-template-columns: repeat(3, 1fr); }
    section { padding: 56px 0; }
}