/* THU OpenClaw Static Site
   - 純 HTML/CSS/JS（無框架）
   - 色彩與排版走乾淨、輕量的校務風格
*/

:root{
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --card: #ffffff;
  --border: #e2e8f0;
  --text: #0f172a;
  --muted: #64748b;

  --blue: #2563eb;
  --blue-weak: rgba(37, 99, 235, 0.12);
  --yellow: #ca8a04;
  --yellow-weak: rgba(202, 138, 4, 0.14);
  --purple: #7c3aed;
  --purple-weak: rgba(124, 58, 237, 0.12);
}

*{ box-sizing: border-box; }
html,body{ height:100%; }
body{
  margin:0;
  background: radial-gradient(900px 500px at 20% 0%, rgba(37,99,235,0.12), transparent 55%),
              radial-gradient(900px 500px at 80% 0%, rgba(124,58,237,0.08), transparent 55%),
              var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans TC", "PingFang TC",
               "Microsoft JhengHei", Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

a{ color: inherit; text-decoration: none; }

.container{
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Topbar */
.topbar{
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.82);
  backdrop-filter: blur(10px);
}
.topbar--dark{
  border-bottom: 1px solid rgba(255,255,255,0.10);
  background: rgba(2, 6, 23, 0.35);
  backdrop-filter: blur(12px);
}
.topbar--dark .brand__name{ color: rgba(255,255,255,0.92); }
.topbar--dark .brand__tagline{ color: rgba(255,255,255,0.68); }
.topbar--dark .nav a{ color: rgba(255,255,255,0.72); }
.topbar--dark .nav a:hover{ background: rgba(255,255,255,0.08); color: rgba(255,255,255,0.92); }
.topbar--dark .nav a.active{ background: rgba(37,99,235,0.22); color: rgba(255,255,255,0.92); }
.topbar__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding: 12px 0;
  gap: 16px;
  position: relative; /* for mobile menu panel positioning */
}
.brand{
  display:flex;
  align-items:center;
  gap: 10px;
}
.brand__logo{
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), #1d4ed8);
  box-shadow: 0 10px 22px rgba(37,99,235,0.20);
}
.brand__name{
  font-weight: 800;
  letter-spacing: 0.2px;
  font-size: 14px;
  line-height: 1.2;
}
.brand__tagline{
  font-size: 12px;
  color: var(--muted);
  margin-top: 2px;
}
.nav{
  display:flex;
  align-items:center;
  gap: 6px;
  flex-wrap: wrap;
}
.nav a{
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 10px;
  transition: 160ms ease;
}
.nav a:hover{
  background: var(--bg-soft);
  color: var(--text);
}
.nav a.active{
  background: var(--blue-weak);
  color: var(--blue);
}

/* Mobile hamburger menu */
.menu-check{
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.menu-toggle{
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.7);
  color: var(--text);
  cursor: pointer;
}
.menu-toggle:hover{
  background: rgba(255,255,255,0.9);
}
.menu-toggle:focus{
  outline: 2px solid rgba(37,99,235,0.35);
  outline-offset: 2px;
}
.menu-toggle__icon{
  width: 18px;
  height: 14px;
  position: relative;
}
.menu-toggle__icon::before,
.menu-toggle__icon::after,
.menu-toggle__icon span{
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: 200ms ease;
}
.menu-toggle__icon::before{ top: 0; }
.menu-toggle__icon span{ top: 6px; }
.menu-toggle__icon::after{ bottom: 0; }

/* When open, morph into X */
.menu-check:checked + .menu-toggle .menu-toggle__icon::before{
  transform: translateY(6px) rotate(45deg);
}
.menu-check:checked + .menu-toggle .menu-toggle__icon span{
  opacity: 0;
}
.menu-check:checked + .menu-toggle .menu-toggle__icon::after{
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 720px){
  .menu-toggle{ display: inline-flex; }
  .nav{
    display: none;
  }
  .menu-check:checked ~ .nav{
    display: flex;
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    min-width: 180px;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 8px;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(10px);
    box-shadow: 0 24px 60px rgba(15,23,42,0.14);
  }
  .menu-check:checked ~ .nav a{
    padding: 10px 10px;
  }
  .topbar--dark .menu-toggle{
    border: 1px solid rgba(255,255,255,0.18);
    background: rgba(2, 6, 23, 0.18);
    color: rgba(255,255,255,0.92);
  }
  .topbar--dark .menu-toggle:hover{
    background: rgba(2, 6, 23, 0.26);
  }
  .topbar--dark .menu-check:checked ~ .nav{
    border: 1px solid rgba(255,255,255,0.14);
    background: rgba(2, 6, 23, 0.62);
    box-shadow: 0 26px 70px rgba(2, 6, 23, 0.32);
  }
  .topbar--dark .menu-check:checked ~ .nav a{
    color: rgba(255,255,255,0.78);
  }
  .topbar--dark .menu-check:checked ~ .nav a:hover{
    background: rgba(255,255,255,0.10);
    color: rgba(255,255,255,0.92);
  }
  .topbar--dark .menu-check:checked ~ .nav a.active{
    background: rgba(37,99,235,0.22);
    color: rgba(255,255,255,0.92);
  }
}

/* Layout blocks */
.hero{ padding: 48px 0 18px; }
.hero__grid{
  display:grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 18px;
  align-items: start;
}
@media (max-width: 880px){
  .hero__grid{ grid-template-columns: 1fr; }
}
.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 18px;
  box-shadow: 0 22px 46px rgba(15,23,42,0.06);
}
.card--flat{
  box-shadow: none;
}
.card--glass{
  color: rgba(255,255,255,0.92);
  background: rgba(2, 6, 23, 0.35);
  border: 1px solid rgba(255,255,255,0.14);
  box-shadow: 0 26px 70px rgba(2, 6, 23, 0.28);
  backdrop-filter: blur(10px);
}
.title{
  font-size: 34px;
  line-height: 1.1;
  margin: 0;
  letter-spacing: -0.3px;
}
.subtitle{
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.7;
  font-size: 14px;
}
.cta{
  display:flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 16px;
}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 14px;
  font-weight: 700;
  font-size: 13px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  transition: 160ms ease;
}
.btn:hover{ transform: translateY(-1px); }
.btn--primary{
  border: none;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), #1d4ed8);
  box-shadow: 0 14px 24px rgba(37,99,235,0.22);
}
.hint{
  margin-top: 10px;
  font-size: 12px;
  color: var(--muted);
}

.section{
  padding: 18px 0 46px;
}
.section h2{
  margin: 0 0 12px;
  font-size: 16px;
  letter-spacing: 0.2px;
}
.grid{
  display:grid;
  gap: 12px;
  grid-template-columns: repeat(3, 1fr);
}
@media (max-width: 880px){
  .grid{ grid-template-columns: 1fr; }
}
.feature__title{
  margin: 0;
  font-size: 14px;
  font-weight: 800;
}
.feature__desc{
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.65;
}

.split{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
@media (max-width: 880px){
  .split{ grid-template-columns: 1fr; }
}
.media{
  width: 100%;
  border-radius: 16px;
  border: 1px solid var(--border);
  overflow: hidden;
  background: var(--bg-soft);
}
.embed{
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
}
.embed iframe{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
.media__hint{
  padding: 10px 12px;
  font-size: 12px;
  color: var(--muted);
}

.badge{
  display:inline-flex;
  align-items:center;
  padding: 4px 8px;
  border-radius: 999px;
  font-weight: 800;
  font-size: 11px;
  letter-spacing: 0.2px;
}
.badge--info{ background: var(--blue-weak); color: var(--blue); }
.badge--warning{ background: var(--yellow-weak); color: var(--yellow); }
.badge--maintenance{ background: var(--purple-weak); color: var(--purple); }
.badge--plan{ background: rgba(15, 23, 42, 0.06); color: rgba(15, 23, 42, 0.65); border: 1px solid rgba(15, 23, 42, 0.10); }

.announcement{
  display:flex;
  flex-direction: column;
  gap: 8px;
}
.announcement__meta{
  display:flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.announcement__title{
  margin:0;
  font-size: 14px;
  font-weight: 900;
}
.announcement__date{
  color: var(--muted);
  font-size: 12px;
}
.announcement__body{
  margin:0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

/* Servers */
.server__row{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap: 12px;
}
.server__name{
  display:flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}
.server__mono{
  font-weight: 950;
  letter-spacing: 0.2px;
}
.server__display{
  color: var(--muted);
  font-size: 13px;
}
.server__meta{
  display:flex;
  flex-wrap: wrap;
  align-items:center;
  gap: 8px;
  margin-top: 10px;
}
.server__chip{
  display:inline-flex;
  align-items:center;
  padding: 4px 8px;
  border-radius: 999px;
  font-weight: 800;
  font-size: 11px;
  letter-spacing: 0.2px;
  background: rgba(15, 23, 42, 0.06);
  color: rgba(15, 23, 42, 0.78);
  border: 1px solid rgba(15, 23, 42, 0.08);
}
.server__muted{
  font-size: 12px;
  color: var(--muted);
}
.server__notes{
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

.footer{
  border-top: 1px solid var(--border);
  background: rgba(255,255,255,0.7);
}
.footer__inner{
  padding: 20px 0;
  color: var(--muted);
  font-size: 12px;
  display:flex;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}

/* 負責單位（明確顯示） */
.owner{
  font-weight: 800;
  color: var(--text);
}

code.inline{
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2px 6px;
  font-size: 12px;
}

/* Poster hero (index) */
.poster{
  position: relative;
  padding: 76px 0 56px;
  overflow: hidden;
  color: rgba(255,255,255,0.92);
  background:
    linear-gradient(110deg, rgba(2,6,23,0.86) 0%, rgba(2,6,23,0.60) 45%, rgba(2,6,23,0.25) 70%, rgba(2,6,23,0.10) 100%),
    url("../assets/hero.jpg");
  background-size: cover;
  background-position: center right;
}
.poster__grid{
  display:grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 18px;
  align-items: end;
}
@media (max-width: 880px){
  .poster{ padding: 56px 0 30px; background-position: 70% center; }
  .poster__grid{ grid-template-columns: 1fr; }
}
.poster .title{
  font-size: 42px;
  letter-spacing: -0.6px;
  color: rgba(255,255,255,0.96);
}
@media (max-width: 520px){
  .poster .title{ font-size: 34px; }
}
.poster .subtitle{ color: rgba(255,255,255,0.72); font-size: 14px; }
.poster .hint{ color: rgba(255,255,255,0.70); }
.poster .btn{
  background: rgba(255,255,255,0.10);
  border: 1px solid rgba(255,255,255,0.18);
  color: rgba(255,255,255,0.92);
}
.poster .btn:hover{
  background: rgba(255,255,255,0.14);
  border-color: rgba(255,255,255,0.24);
}
.poster .btn--primary{
  border: none;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), #1d4ed8);
  box-shadow: 0 14px 24px rgba(37,99,235,0.22);
}

/* Motion (tasteful) */
@media (prefers-reduced-motion: no-preference){
  .reveal{
    animation: fadeUp 700ms cubic-bezier(.2,.9,.2,1) both;
  }
  .reveal.delay-1{ animation-delay: 80ms; }
  .reveal.delay-2{ animation-delay: 160ms; }
  .reveal.delay-3{ animation-delay: 240ms; }
}
@keyframes fadeUp{
  from{ opacity: 0; transform: translateY(10px); }
  to{ opacity: 1; transform: translateY(0); }
}