*,*::before,*::after{box-sizing:border-box}
:root{
  --bg:#04070b;
  --bg-2:#070c13;
  --panel:#0b1019;
  --panel-2:#0e1522;
  --line:rgba(120,180,210,.14);
  --line-strong:rgba(34,211,238,.32);
  --ink:#dce7f1;
  --ink-dim:#93a6b8;
  --ink-faint:#5f7185;
  --accent:#22d3ee;
  --accent-soft:rgba(34,211,238,.12);
  --accent-2:#a78bfa;
  --ok:#34d399;
  --warn:#fbbf24;
  --danger:#fb7185;
  --radius:10px;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue","Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif;
}
html,body{margin:0;padding:0}
body{
  background:var(--bg);color:var(--ink);font-family:var(--sans);
  font-size:15px;line-height:1.65;-webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.25;margin:0 0 .6rem}
code,pre,.mono{font-family:var(--mono)}
::selection{background:rgba(34,211,238,.3);color:#fff}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ---- form primitives ---- */
label{display:block;font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-faint);margin-bottom:.35rem;font-family:var(--mono)}
input,select,textarea{
  width:100%;padding:.6rem .7rem;background:#060a11;color:var(--ink);
  border:1px solid var(--line);border-radius:8px;font:inherit;font-size:.92rem;
  transition:border-color .15s,box-shadow .15s;
}
textarea{min-height:130px;resize:vertical;font-family:var(--mono);font-size:.86rem;line-height:1.6}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(34,211,238,.13)}
input::placeholder,textarea::placeholder{color:#465768}
select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--ink-faint) 50%),linear-gradient(135deg,var(--ink-faint) 50%,transparent 50%);background-position:calc(100% - 18px) 52%,calc(100% - 13px) 52%;background-size:5px 5px,5px 5px;background-repeat:no-repeat;padding-right:2rem}
.field{margin-bottom:1rem}
.field .help{font-size:.74rem;color:var(--ink-faint);margin-top:.3rem}
.check{display:flex;align-items:center;gap:.55rem}
.check input{width:16px;height:16px;accent-color:var(--accent);flex:none}
.check label{margin:0;text-transform:none;letter-spacing:0;font-size:.85rem;color:var(--ink-dim);font-family:var(--sans)}

/* ---- buttons ---- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.45rem;
  padding:.55rem .95rem;border-radius:8px;border:1px solid var(--line);
  background:var(--panel-2);color:var(--ink);font:inherit;font-size:.84rem;
  font-weight:500;cursor:pointer;transition:.16s;white-space:nowrap;
}
.btn:hover{border-color:var(--line-strong);color:#fff;text-decoration:none}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn-primary{background:linear-gradient(180deg,rgba(34,211,238,.22),rgba(34,211,238,.09));border-color:rgba(34,211,238,.5);color:#bff5ff}
.btn-primary:hover{border-color:var(--accent);box-shadow:0 0 18px rgba(34,211,238,.22)}
.btn-danger{color:#ffc9d2;border-color:rgba(251,113,133,.35)}
.btn-danger:hover{border-color:var(--danger);box-shadow:0 0 18px rgba(251,113,133,.18)}
.btn-sm{padding:.32rem .6rem;font-size:.75rem}
.btn-icon{padding:.4rem;width:32px;height:32px}
/* Inline SVGs carry no width/height of their own, so size them here once.
   Without this they collapse to nothing inside a flex button. */
.btn svg{width:15px;height:15px;flex:none}
.btn-sm svg{width:14px;height:14px}
.btn-icon svg{width:16px;height:16px}

/* ---- badges ---- */
.badge{
  display:inline-block;padding:.15rem .5rem;border-radius:999px;font-family:var(--mono);
  font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;
  border:1px solid var(--line);color:var(--ink-dim);
}
.badge-ok{color:var(--ok);border-color:rgba(52,211,153,.4);background:rgba(52,211,153,.08)}
.badge-warn{color:var(--warn);border-color:rgba(251,191,36,.35);background:rgba(251,191,36,.08)}
.badge-dim{color:var(--ink-faint)}
.badge-accent{color:var(--accent);border-color:rgba(34,211,238,.4);background:var(--accent-soft)}
.badge-violet{color:var(--accent-2);border-color:rgba(167,139,250,.4);background:rgba(167,139,250,.1)}
.badge-danger{color:var(--danger);border-color:rgba(251,113,133,.4);background:rgba(251,113,133,.08)}

/* ---- misc ---- */
.muted{color:var(--ink-dim)}
.faint{color:var(--ink-faint)}
.meta{font-family:var(--mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-faint)}
.empty{padding:3rem 1rem;text-align:center;color:var(--ink-faint)}
.empty strong{display:block;color:var(--ink-dim);margin-bottom:.3rem;font-weight:500}
.spinner{width:18px;height:18px;border:2px solid var(--line);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite;display:inline-block}
@keyframes spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){*{animation-duration:.01ms!important;transition-duration:.01ms!important}}

body.site{
  background:
    radial-gradient(1200px 620px at 12% -8%,rgba(34,211,238,.10),transparent 60%),
    radial-gradient(900px 520px at 92% 0%,rgba(167,139,250,.09),transparent 60%),
    var(--bg);
  background-attachment:fixed;
}
body.site::before{
  content:'';position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image:linear-gradient(rgba(120,180,210,.05) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(120,180,210,.05) 1px,transparent 1px);
  background-size:56px 56px;
  -webkit-mask-image:radial-gradient(circle at 50% 20%,#000,transparent 78%);
  mask-image:radial-gradient(circle at 50% 20%,#000,transparent 78%);
}
body.site::after{
  content:'';position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.35;
  background:repeating-linear-gradient(180deg,rgba(255,255,255,.018) 0 1px,transparent 1px 3px);
}
.wrap{position:relative;z-index:1;max-width:940px;margin:0 auto;padding:0 1.25rem}

/* header */
.site-head{position:relative;z-index:2;border-bottom:1px solid var(--line);backdrop-filter:blur(8px);background:rgba(4,7,11,.72);position:sticky;top:0}
.site-head .wrap{display:flex;align-items:center;gap:1rem;height:62px}
.brand{display:flex;align-items:center;gap:.6rem;font-family:var(--mono);font-weight:600;letter-spacing:.08em;color:var(--ink);font-size:.95rem}
.brand:hover{text-decoration:none;color:#fff}
.brand .dot{width:9px;height:9px;border-radius:50%;background:var(--accent);box-shadow:0 0 12px var(--accent)}
.site-nav{margin-left:auto;display:flex;align-items:center;gap:.35rem;flex-wrap:wrap}
.site-nav a{padding:.4rem .7rem;border-radius:7px;font-size:.82rem;color:var(--ink-dim);font-family:var(--mono);letter-spacing:.06em}
.site-nav a:hover{color:var(--accent);background:var(--accent-soft);text-decoration:none}
.site-nav a.cta{border:1px solid rgba(34,211,238,.4);color:#bff5ff}
.lang-switch{display:inline-flex;align-items:center;border:1px solid var(--line);border-radius:7px;overflow:hidden;margin-right:.35rem}
.lang-switch a,.lang-switch .lang-on{padding:.3rem .55rem;font-size:.72rem;font-family:var(--mono);letter-spacing:.06em;line-height:1.4}
.lang-switch a{color:var(--ink-faint);border-radius:0}
.lang-switch a:hover{color:var(--accent);background:var(--accent-soft);text-decoration:none}
.lang-switch .lang-on{color:var(--bg);background:var(--accent);font-weight:600}

/* hero */
.hero{position:relative;z-index:1;padding:3.6rem 0 2.4rem;border-bottom:1px solid var(--line)}
.hero h1{font-size:clamp(1.9rem,5vw,2.9rem);letter-spacing:-.02em;margin-bottom:.5rem}
.hero h1 .accent{background:linear-gradient(90deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--ink-dim);max-width:52ch;margin:0}
.hero .kicker{margin-bottom:.9rem}

/* post list */
.feed{padding:2.4rem 0 4rem}
.post-card{
  position:relative;border:1px solid var(--line);border-radius:var(--radius);
  background:linear-gradient(180deg,rgba(11,16,25,.9),rgba(7,12,19,.9));
  padding:1.3rem 1.4rem;margin-bottom:1rem;transition:.18s;
}
.post-card::before,.post-card::after{content:'';position:absolute;width:10px;height:10px;border-color:var(--line-strong);opacity:0;transition:opacity .18s}
.post-card::before{top:-1px;left:-1px;border-top:1px solid;border-left:1px solid}
.post-card::after{bottom:-1px;right:-1px;border-bottom:1px solid;border-right:1px solid}
.post-card:hover{border-color:rgba(34,211,238,.28);transform:translateY(-1px);box-shadow:0 10px 32px -18px rgba(34,211,238,.5)}
.post-card:hover::before,.post-card:hover::after{opacity:1}
.post-card h2{font-size:1.18rem;margin-bottom:.4rem}
.post-card h2 a{color:var(--ink)}
.post-card h2 a:hover{color:var(--accent);text-decoration:none}
.post-card p{color:var(--ink-dim);margin:0 0 .8rem;font-size:.92rem}
.card-meta{display:flex;gap:.5rem;flex-wrap:wrap;align-items:center}
.tag{font-family:var(--mono);font-size:.66rem;letter-spacing:.08em;color:var(--accent-2);border:1px solid rgba(167,139,250,.28);border-radius:4px;padding:.1rem .4rem}

/* article */
.article{padding:2.6rem 0 4rem}
.article h1{font-size:clamp(1.7rem,4.5vw,2.4rem);letter-spacing:-.02em}
.article .byline{margin:.8rem 0 2rem;padding-bottom:1.4rem;border-bottom:1px solid var(--line);display:flex;gap:.6rem;flex-wrap:wrap;align-items:center}
.prose{font-size:1rem}
.prose h2{margin-top:2rem;font-size:1.3rem;padding-left:.75rem;border-left:2px solid var(--accent)}
.prose h3{margin-top:1.5rem;font-size:1.08rem;color:var(--accent-2)}
.prose p{margin:0 0 1.1rem;color:#c6d5e2}
.prose ul,.prose ol{color:#c6d5e2;padding-left:1.3rem;margin:0 0 1.1rem}
.prose li{margin-bottom:.4rem}
.prose blockquote{margin:0 0 1.1rem;padding:.7rem 1rem;border-left:2px solid var(--accent-2);background:rgba(167,139,250,.07);color:var(--ink-dim);border-radius:0 8px 8px 0}
.prose pre{background:#060a11;border:1px solid var(--line);border-radius:8px;padding:.9rem 1rem;overflow-x:auto;font-size:.82rem;margin:0 0 1.1rem}
.prose code{background:rgba(34,211,238,.1);border:1px solid rgba(34,211,238,.2);border-radius:4px;padding:.08rem .32rem;font-size:.86em;color:#9beef7}
.prose pre code{background:none;border:none;padding:0;color:#c6d5e2}
.prose hr{border:none;border-top:1px solid var(--line);margin:2rem 0}
.prose a{border-bottom:1px solid rgba(34,211,238,.35)}
.locked{border:1px dashed rgba(34,211,238,.35);border-radius:var(--radius);padding:2rem;text-align:center;background:var(--accent-soft)}

/* auth + account */
.narrow{max-width:440px;margin:0 auto;padding:3rem 1.25rem 4rem;position:relative;z-index:1}
.panel{border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(180deg,rgba(11,16,25,.95),rgba(7,12,19,.95));padding:1.6rem}
.panel h1{font-size:1.3rem}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:1.2rem}
.alert{border-radius:8px;padding:.6rem .8rem;font-size:.85rem;margin-bottom:1rem;border:1px solid}
.alert-err{color:#ffd2da;border-color:rgba(251,113,133,.4);background:rgba(251,113,133,.1)}
.alert-ok{color:#c6f7e5;border-color:rgba(52,211,153,.4);background:rgba(52,211,153,.1)}
.acct-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.1rem;align-items:start}
.acct-wrap{max-width:940px;margin:0 auto;padding:2.4rem 1.25rem 4rem;position:relative;z-index:1}
.avatar{width:52px;height:52px;border-radius:12px;display:grid;place-items:center;font-family:var(--mono);font-size:1.25rem;color:#04070b;background:linear-gradient(135deg,var(--accent),var(--accent-2));flex:none}
.stat-row{display:flex;gap:1.6rem;flex-wrap:wrap;margin-top:1rem}
.stat-row div span{display:block;font-family:var(--mono);font-size:1.3rem;color:var(--accent)}

.site-foot{position:relative;z-index:1;border-top:1px solid var(--line);padding:1.6rem 0;color:var(--ink-faint);font-size:.8rem}
.site-foot .wrap{display:flex;gap:1rem;flex-wrap:wrap;justify-content:space-between;align-items:center}

@media (max-width:720px){
  .acct-grid{grid-template-columns:1fr}
  .site-head .wrap{height:auto;padding-top:.7rem;padding-bottom:.7rem;flex-wrap:wrap}
  .site-nav{margin-left:0;width:100%}
}