/* ========================================================
   xCloudinfo Projects Showcase — Shared Design System
   ======================================================== */

/* ── Variables ── */
:root {
  --bg1: #070d1a;
  --bg2: #0d1525;
  --bg3: #131e32;
  --bg4: #1c2840;
  --bg5: #243352;
  --border: #1e2d47;
  --border-lt: #2a3e5e;
  --text1: #e8eef8;
  --text2: #8fa4c4;
  --text3: #4e6285;

  --blue:   #c42020;
  --blue-d: rgba(196,32,32,.14);
  --green:  #22c55e;
  --green-d:rgba(34,197,94,.14);
  --amber:  #f59e0b;
  --amber-d:rgba(245,158,11,.14);
  --red:    #ef4444;
  --red-d:  rgba(239,68,68,.14);
  --purple: #a78bfa;
  --purple-d:rgba(167,139,250,.14);
  --cyan:   #22d3ee;
  --cyan-d: rgba(34,211,238,.14);
  --pink:   #f472b6;
  --pink-d: rgba(244,114,182,.14);
  --teal:   #14b8a6;
  --teal-d: rgba(20,184,166,.14);

  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;
  --r-xl: 20px;
  --shadow: 0 4px 32px rgba(0,0,0,.55);
  --shadow-sm: 0 2px 12px rgba(0,0,0,.4);
  --transition: .18s ease;
}

/* ── Reset ── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg1);
  color:var(--text1);
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','Noto Sans TC',sans-serif;
  font-size:15px;
  line-height:1.65;
  min-height:100vh;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button{cursor:pointer;font:inherit;border:none;background:none}

/* ── Typography ── */
h1{font-size:clamp(28px,4vw,52px);font-weight:800;line-height:1.15}
h2{font-size:clamp(22px,3vw,36px);font-weight:700;line-height:1.25}
h3{font-size:clamp(16px,2vw,22px);font-weight:600;line-height:1.35}
h4{font-size:15px;font-weight:600}
p{color:var(--text2)}
code,pre{font-family:'JetBrains Mono','Fira Code','SF Mono',monospace}

/* ── NAV ── */
.nav{
  position:sticky;top:0;z-index:200;
  background:rgba(7,13,26,.88);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
}
.nav-inner{
  max-width:1340px;margin:0 auto;
  display:flex;align-items:center;gap:12px;
  padding:0 24px;height:58px;
}
.nav-logo{
  display:flex;align-items:center;gap:9px;
  flex-shrink:0;
}
.nav-logo-mark{
  width:32px;height:32px;border-radius:8px;
  background:linear-gradient(135deg,#c42020,#8b1515);
  display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:13px;color:#fff;letter-spacing:-.5px;
}
.nav-logo-text{font-weight:700;font-size:15px}
.nav-logo-text span{color:var(--blue)}
.nav-back{
  display:flex;align-items:center;gap:6px;
  font-size:13px;color:var(--text2);
  padding:5px 10px;border-radius:var(--r-sm);
  transition:var(--transition);
  border:1px solid transparent;
}
.nav-back:hover{color:var(--text1);border-color:var(--border-lt);background:var(--bg3)}
.nav-back svg{flex-shrink:0}
.nav-spacer{flex:1}
.nav-links{display:flex;gap:4px}
.nav-link{
  padding:6px 14px;border-radius:var(--r-sm);
  font-size:13px;color:var(--text2);
  transition:var(--transition);
}
.nav-link:hover{color:var(--text1);background:var(--bg3)}
.nav-link.active{color:var(--text1);background:var(--bg3)}
.nav-badge{
  display:inline-block;
  background:var(--blue);color:#fff;
  border-radius:10px;padding:1px 7px;
  font-size:11px;margin-left:5px;
}
.nav-cta{
  padding:7px 16px;border-radius:var(--r-sm);
  background:var(--blue);color:#fff;
  font-size:13px;font-weight:600;
  transition:var(--transition);
  flex-shrink:0;
}
.nav-cta:hover{background:#a81c1c;transform:translateY(-1px)}

/* ── PAGE WRAPPER ── */
.page{max-width:1340px;margin:0 auto;padding:0 24px}

/* ── HERO (subpage) ── */
.hero-sub{
  padding:56px 0 48px;
  border-bottom:1px solid var(--border);
  display:grid;
  grid-template-columns:1fr auto;
  gap:24px;
  align-items:start;
}
.hero-sub-badge{
  display:inline-flex;align-items:center;gap:7px;
  background:var(--bg3);border:1px solid var(--border-lt);
  border-radius:20px;padding:5px 14px;
  font-size:12px;color:var(--text2);
  margin-bottom:16px;
}
.hero-sub-badge .dot{
  width:7px;height:7px;border-radius:50%;
}
.hero-sub h1{margin-bottom:12px}
.hero-sub p{font-size:17px;max-width:640px;margin-bottom:24px}
.hero-sub-meta{
  display:flex;flex-wrap:wrap;gap:10px;
  align-items:center;
}
.meta-chip{
  display:flex;align-items:center;gap:5px;
  background:var(--bg3);border:1px solid var(--border);
  border-radius:20px;padding:4px 12px;
  font-size:12px;color:var(--text2);
}
.hero-sub-visual{
  background:var(--bg3);border:1px solid var(--border);
  border-radius:var(--r-lg);padding:20px;
  min-width:260px;
  flex-shrink:0;
}

/* ── SECTION ── */
.section{padding:48px 0}
.section-header{
  display:flex;align-items:baseline;gap:12px;
  margin-bottom:28px;
}
.section-title{
  font-size:18px;font-weight:700;
}
.section-sub{font-size:13px;color:var(--text3)}
.section-divider{
  height:1px;background:var(--border);
  margin:48px 0;
}

/* ── GRID ── */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.grid-auto{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
@media(max-width:900px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}

/* ── CARD ── */
.card{
  background:var(--bg2);
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  padding:24px;
  transition:border-color var(--transition),transform var(--transition),box-shadow var(--transition);
  position:relative;overflow:hidden;
}
.card:hover{
  border-color:var(--border-lt);
  transform:translateY(-2px);
  box-shadow:var(--shadow-sm);
}
.card-sm{padding:16px}
.card-accent-top::before{
  content:'';position:absolute;top:0;left:0;right:0;height:2px;
  background:var(--card-color,var(--blue));
  opacity:0;transition:opacity var(--transition);
}
.card:hover .card-accent-top::before,
.card.active .card-accent-top::before{opacity:1}

/* ── STAT CARD ── */
.stat{
  background:var(--bg3);border:1px solid var(--border);
  border-radius:var(--r-md);padding:20px;text-align:center;
}
.stat-num{
  font-size:32px;font-weight:800;line-height:1;
  margin-bottom:4px;
}
.stat-label{font-size:12px;color:var(--text2)}

/* ── BUTTON ── */
.btn{
  display:inline-flex;align-items:center;gap:7px;
  padding:9px 18px;border-radius:var(--r-sm);
  font-size:14px;font-weight:600;
  transition:var(--transition);
  border:1px solid transparent;
}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:#a81c1c;transform:translateY(-1px);box-shadow:0 4px 16px rgba(196,32,32,.3)}
.btn-secondary{background:var(--bg3);color:var(--text1);border-color:var(--border)}
.btn-secondary:hover{border-color:var(--border-lt);background:var(--bg4)}
.btn-ghost{color:var(--text2)}
.btn-ghost:hover{color:var(--text1);background:var(--bg3)}
.btn-sm{padding:6px 12px;font-size:13px}
.btn-lg{padding:12px 24px;font-size:15px}
.btn-icon{padding:8px;border-radius:var(--r-sm)}

/* ── BADGE ── */
.badge{
  display:inline-flex;align-items:center;gap:4px;
  padding:3px 10px;border-radius:20px;
  font-size:11px;font-weight:600;
  letter-spacing:.02em;
}
.badge-blue  {background:var(--blue-d);color:var(--blue);border:1px solid rgba(196,32,32,.25)}
.badge-green {background:var(--green-d);color:var(--green);border:1px solid rgba(34,197,94,.25)}
.badge-amber {background:var(--amber-d);color:var(--amber);border:1px solid rgba(245,158,11,.25)}
.badge-red   {background:var(--red-d);color:var(--red);border:1px solid rgba(239,68,68,.25)}
.badge-purple{background:var(--purple-d);color:var(--purple);border:1px solid rgba(167,139,250,.25)}
.badge-cyan  {background:var(--cyan-d);color:var(--cyan);border:1px solid rgba(34,211,238,.25)}
.badge-pink  {background:var(--pink-d);color:var(--pink);border:1px solid rgba(244,114,182,.25)}
.badge-teal  {background:var(--teal-d);color:var(--teal);border:1px solid rgba(20,184,166,.25)}

/* ── TAG (tech) ── */
.tag{
  display:inline-block;
  background:var(--bg4);border:1px solid var(--border);
  border-radius:var(--r-sm);
  padding:3px 9px;font-size:11px;
  font-family:'JetBrains Mono','Fira Code',monospace;
  color:var(--text2);
}

/* ── PROGRESS ── */
.progress{height:6px;background:var(--bg4);border-radius:3px;overflow:hidden}
.progress-bar{height:100%;border-radius:3px;transition:width 1s ease}

/* ── STATUS DOT ── */
.status-dot{
  display:inline-block;width:7px;height:7px;
  border-radius:50%;flex-shrink:0;
}
.dot-green{background:var(--green);box-shadow:0 0 6px var(--green)}
.dot-amber{background:var(--amber);box-shadow:0 0 6px var(--amber)}
.dot-blue {background:var(--blue);box-shadow:0 0 6px var(--blue)}
.dot-red  {background:var(--red);box-shadow:0 0 6px var(--red)}

/* ── TAB ── */
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--border);margin-bottom:24px}
.tab{
  padding:10px 16px;font-size:13px;font-weight:500;
  color:var(--text2);cursor:pointer;
  border-bottom:2px solid transparent;
  margin-bottom:-1px;transition:var(--transition);
}
.tab:hover{color:var(--text1)}
.tab.active{color:var(--blue);border-bottom-color:var(--blue)}
.tab-panel{display:none}
.tab-panel.active{display:block}

/* ── FEATURE ROW ── */
.feature-row{
  display:flex;gap:10px;align-items:flex-start;
  padding:10px 0;border-bottom:1px solid var(--border);
}
.feature-row:last-child{border-bottom:none}
.feature-icon{
  width:34px;height:34px;border-radius:var(--r-sm);
  display:flex;align-items:center;justify-content:center;
  font-size:16px;flex-shrink:0;
  background:var(--bg4);
}
.feature-title{font-size:14px;font-weight:600;margin-bottom:2px}
.feature-desc{font-size:13px;color:var(--text2)}

/* ── ARCH BOX ── */
.arch-box{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--r-lg);padding:24px;
  font-family:'JetBrains Mono','Fira Code',monospace;
  font-size:13px;color:var(--text2);
  overflow-x:auto;line-height:1.8;
  white-space:pre;
}
.arch-box .hl{color:var(--blue)}
.arch-box .hl2{color:var(--green)}
.arch-box .hl3{color:var(--amber)}
.arch-box .hl4{color:var(--purple)}

/* ── ROADMAP ── */
.roadmap{display:flex;flex-direction:column;gap:0}
.roadmap-item{
  display:flex;gap:16px;align-items:flex-start;
  padding:16px 0;border-bottom:1px solid var(--border);
}
.roadmap-item:last-child{border-bottom:none}
.roadmap-dot-wrap{
  display:flex;flex-direction:column;align-items:center;
  padding-top:5px;
}
.roadmap-dot{
  width:12px;height:12px;border-radius:50%;flex-shrink:0;
}
.roadmap-line{width:1px;background:var(--border);flex:1;min-height:16px;margin-top:4px}
.roadmap-content{flex:1}
.roadmap-label{font-size:11px;color:var(--text3);text-transform:uppercase;letter-spacing:.08em;margin-bottom:4px}
.roadmap-title{font-size:14px;font-weight:600;margin-bottom:6px}
.roadmap-items{display:flex;flex-wrap:wrap;gap:6px}
.roadmap-chip{
  background:var(--bg3);border:1px solid var(--border);
  border-radius:20px;padding:3px 10px;font-size:12px;color:var(--text2);
}

/* ── DEMO FRAME ── */
.demo-frame{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--r-lg);overflow:hidden;
}
.demo-toolbar{
  display:flex;align-items:center;gap:8px;
  padding:10px 16px;background:var(--bg3);
  border-bottom:1px solid var(--border);
}
.demo-dots{display:flex;gap:5px}
.demo-dot{width:10px;height:10px;border-radius:50%}
.demo-dot-r{background:#ef4444}.demo-dot-y{background:#f59e0b}.demo-dot-g{background:#22c55e}
.demo-url{
  flex:1;background:var(--bg4);border:1px solid var(--border);
  border-radius:var(--r-sm);padding:4px 10px;
  font-size:12px;color:var(--text3);
  font-family:'JetBrains Mono',monospace;
}
.demo-body{padding:0}

/* ── SCROLLBAR ── */
::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-track{background:var(--bg2)}
::-webkit-scrollbar-thumb{background:var(--bg5);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:var(--border-lt)}

/* ── ANIMATIONS ── */
@keyframes fade-up{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
@keyframes fade-in{from{opacity:0}to{opacity:1}}
@keyframes pulse-dot{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.85)}}
@keyframes blink{0%,100%{opacity:1}50%{opacity:0}}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes shimmer{0%{background-position:-400px 0}100%{background-position:400px 0}}
@keyframes slide-in-r{from{opacity:0;transform:translateX(20px)}to{opacity:1;transform:none}}
@keyframes slide-in-l{from{opacity:0;transform:translateX(-20px)}to{opacity:1;transform:none}}
@keyframes count-up{from{opacity:0;transform:scale(.8)}to{opacity:1;transform:scale(1)}}
@keyframes flow{0%{stroke-dashoffset:200}100%{stroke-dashoffset:0}}
@keyframes glow{0%,100%{box-shadow:0 0 4px currentColor}50%{box-shadow:0 0 12px currentColor}}

.animate-fade-up{animation:fade-up .5s ease both}
.animate-fade-in{animation:fade-in .4s ease both}

/* ── FOOTER ── */
.footer{
  border-top:1px solid var(--border);
  padding:32px 24px;
  max-width:1340px;margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;
  flex-wrap:wrap;gap:16px;
}
.footer p{font-size:13px;color:var(--text3)}

/* ── RESPONSIVE ── */
@media(max-width:768px){
  .hero-sub{grid-template-columns:1fr}
  .hero-sub-visual{display:none}
  .nav-links{display:none}
}