:root {
  --ink: #07111f;
  --navy: #0b1c33;
  --cyan: #12b8c8;
  --cyan-deep: #0a8f9c;
  --violet: #6d5efc;
  --sand: #eef3f8;
  --mist: #d9f4f7;
  --line: rgba(7, 17, 31, 0.12);
  --muted: rgba(7, 17, 31, 0.72);
  --white: #fff;
  --shadow: 0 22px 48px rgba(7, 17, 31, 0.14);
  --font-display: "Sora", "Be Vietnam Pro", sans-serif;
  --font-body: "Be Vietnam Pro", sans-serif;
  --max: 1080px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(900px 520px at 90% -10%, rgba(18, 184, 200, 0.22), transparent 55%),
    radial-gradient(700px 420px at -10% 20%, rgba(109, 94, 252, 0.16), transparent 50%),
    linear-gradient(168deg, #f5f8fc 0%, #e8eef6 48%, #e4f2f4 100%);
  line-height: 1.7;
}
a { color: var(--cyan-deep); }
.top, .wrap, .footer, .hero, .section {
  position: relative; z-index: 1;
  max-width: var(--max); margin: 0 auto;
  padding-left: 1.25rem; padding-right: 1.25rem;
}
.top {
  display: flex; align-items: center; gap: 1rem;
  padding-top: 1.1rem; padding-bottom: 1.1rem;
}
.brand { display: inline-flex; align-items: center; gap: 0.65rem; text-decoration: none; color: inherit; }
.brand-mark {
  width: 2rem; height: 2rem; border-radius: 0.7rem;
  background: linear-gradient(145deg, var(--cyan), var(--violet));
  box-shadow: inset 0 0 0 2px rgba(255,255,255,0.25);
}
.brand-name { font-family: var(--font-display); font-weight: 800; letter-spacing: -0.03em; }
.nav { display: flex; gap: 1rem; margin-left: auto; flex-wrap: wrap; }
.nav a { color: var(--muted); text-decoration: none; font-weight: 500; font-size: 0.92rem; }
.nav a:hover { color: var(--cyan-deep); }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.72rem 1.15rem; border-radius: 999px; text-decoration: none;
  font-weight: 600; font-size: 0.94rem; transition: transform .18s ease, box-shadow .18s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--cyan), var(--cyan-deep));
  color: var(--white); box-shadow: 0 12px 26px rgba(10, 143, 156, 0.28);
}
.btn-vps {
  background: linear-gradient(135deg, #7c3aed, #4f46e5);
  color: #fff; box-shadow: 0 12px 28px rgba(79, 70, 229, 0.28);
}
.btn-soft {
  background: rgba(255,255,255,0.78); color: var(--ink);
  border: 1px solid var(--line); backdrop-filter: blur(8px);
}
.btn-ghost { color: var(--ink); border: 1px solid var(--line); background: transparent; }

.hero {
  padding-top: 2.6rem; padding-bottom: 3.2rem;
  display: grid; gap: 1rem; min-height: min(74vh, 680px); align-content: start;
}
.eyebrow {
  display: inline-flex; width: fit-content; gap: 0.4rem; align-items: center;
  padding: 0.35rem 0.85rem; border-radius: 999px; font-size: 0.82rem; font-weight: 600;
  background: rgba(255,255,255,0.72); border: 1px solid var(--line); color: var(--cyan-deep);
}
.brand-hero {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 7.5vw, 4.6rem);
  font-weight: 800; letter-spacing: -0.05em; line-height: 0.95;
  background: linear-gradient(120deg, var(--navy), var(--cyan-deep));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero h1 {
  max-width: 18ch; font-family: var(--font-display);
  font-size: clamp(1.4rem, 3.1vw, 2.1rem);
  letter-spacing: -0.03em; line-height: 1.28;
}
.lead { max-width: 40rem; color: var(--muted); font-size: 1.05rem; }
.cta { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 0.3rem; }

.section { padding: 3rem 1.25rem; }
.section h2 {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.7vw, 1.85rem);
  letter-spacing: -0.03em; margin-bottom: 0.55rem;
}
.section-lead { max-width: 42rem; color: var(--muted); margin-bottom: 1.5rem; }
.feature-list, .article-list { list-style: none; display: grid; gap: 0.85rem; }
.feature-list li, .article-list li {
  display: grid; gap: 0.3rem; padding: 1.05rem 0; border-top: 1px solid var(--line);
}
.feature-list li:last-child, .article-list li:last-child { border-bottom: 1px solid var(--line); }
.feature-list strong, .article-list a { font-size: 1.05rem; font-weight: 700; text-decoration: none; color: var(--ink); }
.article-list a:hover { color: var(--cyan-deep); }
.feature-list span, .article-list p, .muted { color: var(--muted); }

.promo {
  margin-top: 1.4rem; padding: 1.35rem 1.3rem; border-radius: 18px;
  background: linear-gradient(145deg, rgba(255,255,255,0.92), rgba(217,244,247,0.9));
  border: 1px solid rgba(18, 184, 200, 0.22); box-shadow: var(--shadow); display: grid; gap: 0.8rem;
}
.promo h3 { font-family: var(--font-display); font-size: 1.2rem; letter-spacing: -0.02em; }
.promo p { color: var(--muted); }
.promo-actions { display: flex; flex-wrap: wrap; gap: 0.65rem; }

.article-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1rem;
}
.article-card {
  display: grid; gap: 0.45rem; align-content: start;
  padding: 1.15rem 1.1rem; border-radius: 16px;
  background: rgba(255,255,255,0.74); border: 1px solid var(--line);
  text-decoration: none; color: inherit;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.article-card:hover {
  transform: translateY(-2px);
  border-color: rgba(18, 184, 200, 0.45);
  box-shadow: var(--shadow);
}
.article-card .tag {
  width: fit-content; font-size: 0.75rem; font-weight: 700;
  color: var(--cyan-deep); background: var(--mist); padding: 0.2rem 0.55rem; border-radius: 999px;
}
.article-card h3 { font-size: 1.05rem; line-height: 1.35; font-family: var(--font-display); letter-spacing: -0.02em; }
.article-card p { font-size: 0.92rem; color: var(--muted); }

.footer {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem;
  padding: 1.5rem 1.25rem 2rem; margin-top: 1rem;
  border-top: 1px solid var(--line); color: rgba(7,17,31,0.55); font-size: 0.9rem;
}
.footer-links { display: flex; flex-wrap: wrap; gap: 0.85rem; }
.footer-links a { color: rgba(7,17,31,0.65); text-decoration: none; }
.footer-links a:hover { color: var(--cyan-deep); }

.article-hero { padding-top: 2rem; padding-bottom: 1.4rem; }
.article-hero .meta { color: var(--muted); font-size: 0.92rem; margin-top: 0.55rem; }
.article-body { max-width: 760px; }
.article-body h2 {
  font-family: var(--font-display); font-size: 1.32rem; letter-spacing: -0.02em; margin: 2rem 0 0.7rem;
}
.article-body p { margin-bottom: 1rem; color: rgba(7,17,31,0.86); }
.article-body ul { margin: 0 0 1.1rem 1.2rem; color: rgba(7,17,31,0.86); }
.article-body li { margin-bottom: 0.4rem; }
.article-body .tip {
  margin: 1.2rem 0; padding: 1rem 1.1rem; border-radius: 14px;
  background: var(--mist); border-left: 4px solid var(--cyan);
}
.breadcrumb { font-size: 0.88rem; color: var(--muted); margin-bottom: 1rem; }
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--cyan-deep); }
.related { margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }
.related h2 { margin-bottom: 1rem; }

@media (max-width: 820px) {
  .nav { display: none; }
  .hero { min-height: auto; padding-top: 1.4rem; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}