/* lzlong — OPC-inspired personal blog home (static) */

:root,
html[data-theme="light"]{
  --opc-primary:#2563eb;
  --opc-bg:#f8fafc;
  --opc-card:#ffffff;
  --opc-text:#111827;
  --opc-text-2:#64748b;
  --opc-border:#e2e8f0;
}

html[data-theme="dark"]{
  --opc-primary:#60a5fa;
  --opc-bg:#020617;
  --opc-card:#0f172a;
  --opc-text:#f8fafc;
  --opc-text-2:#94a3b8;
  --opc-border:#1e293b;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  color:var(--opc-text);
  background:var(--opc-bg);
}

a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}

#theme-opc{
  min-height:100vh;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--opc-border) 46%, transparent) 1px, transparent 1px),
    linear-gradient(color-mix(in srgb, var(--opc-border) 40%, transparent) 1px, transparent 1px),
    linear-gradient(135deg, var(--opc-bg) 0%, color-mix(in srgb, var(--opc-bg) 80%, var(--opc-card)) 55%, color-mix(in srgb, var(--opc-primary) 5%, var(--opc-bg)) 100%);
  background-size:72px 72px, 72px 72px, auto;
  color:var(--opc-text);
}

html[data-theme="dark"] #theme-opc{
  background:
    radial-gradient(circle at 18% 18%, color-mix(in srgb, var(--opc-primary) 18%, transparent) 0, transparent 28%),
    linear-gradient(90deg, color-mix(in srgb, var(--opc-border) 44%, transparent) 1px, transparent 1px),
    linear-gradient(color-mix(in srgb, var(--opc-border) 34%, transparent) 1px, transparent 1px),
    linear-gradient(135deg, var(--opc-bg) 0%, #07111f 56%, #030712 100%);
  background-size:auto, 72px 72px, 72px 72px, auto;
}

.opc-muted{color:var(--opc-text-2)}

.opc-dark-mode-button{
  position:fixed;right:18px;bottom:18px;z-index:50;
  width:46px;height:46px;border-radius:999px;
  border:1px solid color-mix(in srgb, var(--opc-border) 88%, transparent);
  background:color-mix(in srgb, var(--opc-card) 92%, transparent);
  color:var(--opc-text);
  box-shadow:0 14px 40px color-mix(in srgb, var(--opc-text) 12%, transparent);
  cursor:pointer;display:grid;place-items:center;
  transition:transform .2s, border-color .2s, color .2s;
}
.opc-dark-mode-button:hover{
  border-color:var(--opc-primary);color:var(--opc-primary);transform:translateY(-1px);
}
html[data-theme="light"] .icon-moon{display:none}
html[data-theme="dark"] .icon-sun{display:none}

.opc-top{padding:22px clamp(20px,4vw,40px) 0}
.opc-top-inner{
  max-width:1120px;margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.opc-brand{display:inline-flex;align-items:center;gap:10px;font-weight:700}
.opc-brand img{width:28px;height:28px;border-radius:8px;object-fit:cover;border:1px solid var(--opc-border)}
.opc-status{
  font-size:12px;font-weight:700;padding:8px 12px;border-radius:999px;
  background:color-mix(in srgb, var(--opc-primary) 12%, transparent);
  color:var(--opc-primary);
}

.opc-main{max-width:1120px;margin:0 auto;padding:28px clamp(20px,4vw,40px) 80px}

.opc-hero{
  display:grid;grid-template-columns:1.05fr .95fr;gap:28px;align-items:stretch;margin-top:18px;
}
.opc-kicker,.opc-secondary-action,.opc-method,.opc-portal-card{
  border:1px solid color-mix(in srgb, var(--opc-border) 88%, transparent);
  background:color-mix(in srgb, var(--opc-card) 82%, transparent);
}
.opc-kicker{
  display:inline-flex;align-items:center;padding:8px 12px;border-radius:999px;
  font-size:12px;font-weight:700;color:var(--opc-primary);margin-bottom:16px;
}
.opc-hero h1{
  font-size:clamp(48px,8vw,78px);line-height:.95;letter-spacing:-.05em;margin:0 0 14px;
}
.opc-subtitle{font-size:clamp(20px,3vw,28px);font-weight:700;margin:0 0 14px}
.opc-desc{font-size:16px;line-height:1.75;max-width:36em;margin:0 0 24px}
.opc-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:18px}
.opc-primary-action{
  display:inline-flex;align-items:center;justify-content:center;
  padding:12px 18px;border-radius:10px;font-weight:700;
  background:var(--opc-primary);color:var(--opc-bg);
  box-shadow:0 18px 46px color-mix(in srgb, var(--opc-primary) 20%, transparent);
  transition:background .2s, transform .2s;
}
.opc-primary-action:hover{
  background:color-mix(in srgb, var(--opc-primary) 86%, var(--opc-text));
  transform:translateY(-1px);
}
html[data-theme="dark"] .opc-primary-action{color:#020617}
.opc-secondary-action{
  display:inline-flex;align-items:center;justify-content:center;
  padding:12px 18px;border-radius:10px;font-weight:700;
  transition:border-color .2s, background .2s, transform .2s;
}
.opc-secondary-action:hover,.opc-portal-card:hover{
  border-color:var(--opc-primary);
  background:color-mix(in srgb, var(--opc-primary) 7%, var(--opc-card));
  transform:translateY(-2px);
}
.opc-tags{display:flex;flex-wrap:wrap;gap:8px}
.opc-tags span{
  font-size:12px;color:var(--opc-text-2);padding:6px 10px;border-radius:999px;
  border:1px dashed color-mix(in srgb, var(--opc-border) 90%, transparent);
}

.opc-panel{
  border:1px solid color-mix(in srgb, var(--opc-border) 92%, transparent);
  background:color-mix(in srgb, var(--opc-card) 92%, transparent);
  box-shadow:0 24px 70px color-mix(in srgb, var(--opc-text) 9%, transparent);
  border-radius:18px;padding:22px;
}
.opc-panel-label{
  font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  color:var(--opc-primary);margin-bottom:10px;
}
.opc-workflow h2{margin:0 0 10px;font-size:24px;letter-spacing:-.03em}
.opc-workflow > .opc-muted{margin:0 0 18px;line-height:1.7}
.opc-steps{display:grid;gap:10px;margin-bottom:16px}
.opc-step{
  display:grid;grid-template-columns:42px 1fr;grid-template-rows:auto auto;gap:2px 12px;
  padding:12px;border-radius:12px;border:1px solid color-mix(in srgb, var(--opc-border) 90%, transparent);
}
.opc-step em{grid-row:span 2;align-self:center;font-style:normal;font-weight:800;color:var(--opc-primary)}
.opc-step strong{font-size:14px}
.opc-step span{font-size:13px}
.opc-method{border-radius:14px;padding:14px}
.opc-method-title{font-weight:800;margin-bottom:6px}
.opc-method p{margin:0 0 10px;font-size:14px;line-height:1.6}
.opc-methods{display:flex;flex-wrap:wrap;gap:8px}
.opc-methods span{
  font-size:12px;font-weight:700;padding:6px 10px;border-radius:999px;
  background:color-mix(in srgb, var(--opc-primary) 10%, transparent);color:var(--opc-primary);
}

.opc-section{margin-top:56px}
.opc-section-head{margin-bottom:20px}
.opc-section-head h2{margin:0 0 8px;font-size:clamp(28px,4vw,40px);letter-spacing:-.03em}
.opc-section-head .opc-muted{margin:0;max-width:40em;line-height:1.7}

.opc-now-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:14px;
}
.opc-portal-card{
  border-radius:16px;padding:18px;transition:transform .2s, border-color .2s, background .2s;
}
.opc-portal-card h3{margin:0 0 8px;font-size:18px}
.opc-portal-card p{margin:0;font-size:14px}

.opc-posts{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.opc-post{display:block;transition:transform .2s, border-color .2s}
.opc-post:hover{transform:translateY(-3px);border-color:var(--opc-primary)}
.opc-post time{font-size:12px;color:var(--opc-text-2);font-weight:700}
.opc-post h3{margin:10px 0 8px;font-size:20px;letter-spacing:-.02em}
.opc-post p{margin:0;line-height:1.65;font-size:14px}

.opc-footer{padding:0 clamp(20px,4vw,40px) 40px}
.opc-footer > div{
  max-width:1120px;margin:0 auto;padding-top:22px;
  border-top:1px solid color-mix(in srgb, var(--opc-border) 90%, transparent);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:12px;color:var(--opc-text-2);
}
.opc-footer-links{display:flex;gap:14px}
.opc-footer a{color:var(--opc-primary);font-weight:700}
.opc-footer a:hover{text-decoration:underline;text-underline-offset:4px}

@media (max-width:900px){
  .opc-hero,.opc-now-grid,.opc-posts{grid-template-columns:1fr}
  .opc-dark-mode-button{right:14px;bottom:14px}
}