:root {
  --bg: #05070d;
  --panel: rgba(13, 20, 32, 0.72);
  --border: rgba(0, 240, 255, 0.18);
  --cyan: #00f0ff;
  --magenta: #ff2bd6;
  --text: #dbe7f4;
  --muted: #7d93ad;
  --radius: 14px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang TC", "Noto Sans TC", -apple-system, sans-serif;
  line-height: 1.7;
  min-height: 100vh;
  background-image:
    radial-gradient(1200px 600px at 80% -10%, rgba(0, 240, 255, 0.08), transparent),
    radial-gradient(900px 500px at 10% 110%, rgba(255, 43, 214, 0.07), transparent);
}
a { color: var(--cyan); text-decoration: none; }

/* nav */
nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 24px;
  padding: 14px 28px;
  background: rgba(5, 7, 13, 0.8);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
nav .logo { font-weight: 700; letter-spacing: 2px; color: var(--cyan); }
nav .logo span { color: var(--magenta); }
nav a.navlink { color: var(--muted); font-size: 0.95rem; }
nav a.navlink:hover { color: var(--cyan); }
nav .spacer { flex: 1; }

/* layout */
main { max-width: 1080px; margin: 0 auto; padding: 48px 24px 96px; }
section { display: none; }
section.active { display: block; animation: fade 0.35s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; } }

/* hero */
.hero { text-align: center; padding: 72px 0 40px; }
.hero .orb {
  width: 120px; height: 120px; margin: 0 auto 32px; border-radius: 50%;
  background: conic-gradient(from 0deg, var(--cyan), var(--magenta), var(--cyan));
  filter: blur(2px);
  animation: spin 9s linear infinite;
  position: relative;
}
.hero .orb::after {
  content: ""; position: absolute; inset: 6px; border-radius: 50%;
  background: var(--bg);
}
@keyframes spin { to { transform: rotate(360deg); } }
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  letter-spacing: 4px;
  background: linear-gradient(120deg, var(--cyan), #fff 45%, var(--magenta));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.sub { color: var(--muted); margin: 16px auto 32px; max-width: 640px; }

.btn {
  display: inline-block; padding: 12px 28px; border-radius: 999px;
  border: 1px solid var(--cyan); color: var(--cyan);
  background: rgba(0, 240, 255, 0.06);
  font-size: 1rem; cursor: pointer; transition: 0.2s;
}
.btn:hover { background: rgba(0, 240, 255, 0.16); box-shadow: 0 0 24px rgba(0,240,255,0.35); }
.btn.primary {
  background: linear-gradient(120deg, rgba(0,240,255,0.25), rgba(255,43,214,0.25));
  border-color: transparent; color: #fff;
}

/* about */
.about-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; margin-top: 24px; }
.card {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
  backdrop-filter: blur(8px);
  transition: 0.25s;
}
.card:hover { border-color: var(--cyan); box-shadow: 0 0 32px rgba(0,240,255,0.12); transform: translateY(-3px); }
.card h3 { color: var(--cyan); margin-bottom: 10px; font-size: 1.05rem; }
.card p { color: var(--muted); font-size: 0.95rem; }

h2.sec { font-size: 1.6rem; letter-spacing: 2px; margin-top: 64px; }
h2.sec::after { content: ""; display: block; width: 56px; height: 2px; margin-top: 10px;
  background: linear-gradient(90deg, var(--cyan), var(--magenta)); }

/* works */
.works-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 20px; margin-top: 24px; }
.work { cursor: pointer; overflow: hidden; }
.work .cover { height: 140px; border-radius: 10px; margin-bottom: 14px; position: relative; overflow: hidden; }
.cover.g0 { background: linear-gradient(135deg, #00323a, #00f0ff44, #0b2545); }
.cover.g1 { background: linear-gradient(135deg, #3a0032, #ff2bd644, #1a0b2e); }
.cover .badge {
  position: absolute; top: 10px; left: 10px; font-size: 0.72rem;
  padding: 2px 10px; border-radius: 999px;
  background: rgba(0,0,0,0.5); border: 1px solid var(--border); color: var(--cyan);
}
.work h4 { font-size: 1.05rem; }
.work .meta { color: var(--muted); font-size: 0.85rem; margin-top: 6px; }
.work .tags { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.work .tags span { font-size: 0.75rem; color: var(--muted); border: 1px solid var(--border); padding: 2px 10px; border-radius: 999px; }

/* reader */
#reader-layout { display: grid; grid-template-columns: 240px 1fr; gap: 28px; margin-top: 24px; }
@media (max-width: 760px) { #reader-layout { grid-template-columns: 1fr; } }
.chapters { align-self: start; position: sticky; top: 90px; }
.chapters .card { padding: 12px; max-height: 65vh; overflow: auto; }
.chapters button {
  display: block; width: 100%; text-align: left; padding: 10px 12px;
  background: none; border: none; color: var(--muted); cursor: pointer;
  border-radius: 8px; font-size: 0.92rem;
}
.chapters button:hover { color: var(--cyan); background: rgba(0,240,255,0.06); }
.chapters button.current { color: var(--cyan); background: rgba(0,240,255,0.1); }

.reader-toolbar { display: flex; gap: 10px; align-items: center; margin-bottom: 18px; flex-wrap: wrap; }
.reader-toolbar button {
  background: none; border: 1px solid var(--border); color: var(--muted);
  border-radius: 8px; padding: 6px 14px; cursor: pointer;
}
.reader-toolbar button:hover { color: var(--cyan); border-color: var(--cyan); }
#reader-content {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 40px 44px; min-height: 50vh;
}
#reader-content h1 { color: var(--cyan); margin-bottom: 24px; font-size: 1.4rem; }
#reader-content p { margin-bottom: 1.2em; }
#reader-content blockquote {
  border-left: 2px solid var(--magenta); padding: 6px 18px; margin: 1.2em 0;
  color: var(--muted); font-style: italic;
}
#reader-content hr { border: none; border-top: 1px dashed var(--border); margin: 2em 0; }
#reader-content strong { color: #fff; }
.reader-nav { display: flex; justify-content: space-between; margin-top: 22px; }
#reader-progress { height: 3px; background: var(--border); border-radius: 3px; margin-top: 26px; overflow: hidden; }
#reader-progress i { display: block; height: 100%; background: linear-gradient(90deg, var(--cyan), var(--magenta)); width: 0; transition: width 0.2s; }

/* footer */
footer { border-top: 1px solid var(--border); padding: 28px; text-align: center; color: var(--muted); font-size: 0.85rem; }

/* night mode off (light) */
body.light { --bg:#f4f7fb; --panel:#ffffff; --text:#1a2433; --muted:#5b6b80; --border:rgba(0,120,160,0.25); }
body.light .hero h1 { background: linear-gradient(120deg,#007a8a,#123 45%,#a4008f); -webkit-background-clip:text; background-clip:text; }