:root {
  --primary: #0f2744;
  --accent: #1d4ed8;
  --bg: #eef3f8;
  --card: #ffffff;
  --muted: #5b6b7c;
  --border: #d7e0ea;
  --shadow: 0 10px 28px rgba(15, 39, 68, 0.08);
  --radius: 14px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: "Manrope", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: #0f172a;
  line-height: 1.65;
  min-height: 100vh;
}

.sp-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(1100px 480px at 8% -8%, rgba(29, 78, 216, 0.12), transparent 60%),
    radial-gradient(800px 400px at 92% 0%, rgba(15, 118, 110, 0.1), transparent 55%),
    linear-gradient(180deg, #f7fafc 0%, #eef3f8 50%, #e8eef5 100%);
}

.sp-top {
  max-width: 920px;
  margin: 0 auto;
  padding: 16px max(16px, env(safe-area-inset-right)) 0 max(16px, env(safe-area-inset-left));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.sp-brand {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.sp-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  align-items: center;
  font-size: 0.88rem;
  font-weight: 700;
}

.sp-nav a {
  color: #2563eb;
  text-decoration: none;
}

.sp-nav a:hover { text-decoration: underline; }

.sp-lang {
  display: inline-flex;
  gap: 4px;
  background: rgba(255,255,255,0.9);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px;
}

.sp-lang button,
.sp-lang a {
  border: none;
  background: transparent;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--muted);
  padding: 6px 10px;
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
}

.sp-lang button.active,
.sp-lang a.active {
  background: var(--primary);
  color: #fff;
}

.sp-wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: 20px max(16px, env(safe-area-inset-right)) 48px max(16px, env(safe-area-inset-left));
}

.sp-hero {
  margin-bottom: 22px;
}

.sp-hero h1 {
  color: var(--primary);
  font-size: clamp(1.55rem, 4vw, 2.1rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 8px;
}

.sp-hero .lead {
  color: var(--muted);
  font-size: 1.02rem;
  max-width: 62ch;
}

.sp-meta {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--muted);
}

.sp-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 22px 18px;
  margin-bottom: 16px;
}

.sp-card h2 {
  color: var(--primary);
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 10px;
  letter-spacing: -0.02em;
}

.sp-card h3 {
  color: #1e293b;
  font-size: 1rem;
  font-weight: 750;
  margin: 14px 0 6px;
}

.sp-card p,
.sp-card li {
  color: #334155;
  font-size: 0.95rem;
}

.sp-card p + p { margin-top: 10px; }

.sp-card ul,
.sp-card ol {
  margin: 8px 0 0 1.2rem;
}

.sp-card li { margin: 5px 0; }

.sp-card a { color: #2563eb; font-weight: 650; }

.sp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 8px;
}

.sp-guide-card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, transform 0.15s;
}

.sp-guide-card:hover {
  border-color: #93c5fd;
  transform: translateY(-2px);
}

.sp-guide-card h2 {
  color: var(--primary);
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.sp-guide-card p {
  color: var(--muted);
  font-size: 0.9rem;
}

.sp-foot {
  max-width: 920px;
  margin: 0 auto;
  padding: 8px max(16px, env(safe-area-inset-right)) 28px max(16px, env(safe-area-inset-left));
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  justify-content: space-between;
}

.sp-foot a {
  color: #2563eb;
  font-weight: 700;
  text-decoration: none;
}

.sp-foot-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
}

.sp-foot-links a::after {
  content: "";
}

@media (max-width: 640px) {
  .sp-card { padding: 16px; }
  .sp-top { padding-top: 12px; }
}