:root{
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
               "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Roboto Mono", ui-monospace,
               Consolas, Menlo, monospace;

  --bg:            #eef1f6;
  --text:          #1e293b;
  --text-soft:     #475569;
  --muted:         #64748b;
  --faint:         #64748b;

  --glass:         rgba(255,255,255,.62);
  --glass-hi:      rgba(255,255,255,.82);
  --glass-border:  rgba(255,255,255,.95);
  --glass-hover:   rgba(255,255,255,.90);

  --blue:          #2563eb;
  --blue-deep:     #1d4ed8;
  --indigo:        #4f46e5;
  --teal:          #0d9488;
  --green:         #15803d;
  --amber:         #b45309;
  --slate:         #64748b;

  --shadow-lg: 0 22px 52px -22px rgba(30,41,80,.24), 0 3px 12px -6px rgba(30,41,80,.08);
  --shadow-sm: 0 12px 28px -16px rgba(30,41,80,.20);
  --shadow-xs: 0 5px 14px -8px rgba(30,41,80,.16);

  --r-xl: 26px;
  --r-lg: 20px;
  --r-md: 16px;
  --r-sm: 12px;
}

*,*::before,*::after{ box-sizing:border-box; }

html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }

body{
  margin:0;
  min-height:100vh;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.62;
  color:var(--text);
  background-color:var(--bg);
  background-image:
    radial-gradient(900px 520px at 8% -8%, rgba(37,99,235,.08), transparent 62%),
    radial-gradient(760px 480px at 94% 4%,  rgba(79,70,229,.06), transparent 64%);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

ul,ol,dl{ margin:0; padding:0; list-style:none; }

.sr-only{
  position:absolute;
  width:1px; height:1px;
  padding:0; margin:-1px;
  overflow:hidden;
  clip:rect(0,0,0,0);
  white-space:nowrap;
  border:0;
}

.app{
  width:min(100% - 32px, 1140px);
  margin:0 auto;
  padding:28px 0 48px;
  display:flex;
  flex-direction:column;
  gap:26px;
}

main#main-content{
  display:flex;
  flex-direction:column;
  gap:26px;
}

h1,h2,h3{ line-height:1.35; margin:0; }

.glass{
  background:var(--glass);
  -webkit-backdrop-filter:blur(12px) saturate(150%);
  backdrop-filter:blur(12px) saturate(150%);
  border:1px solid var(--glass-border);
  box-shadow:var(--shadow-sm), inset 0 1px 0 rgba(255,255,255,.9);
}

@supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){
  .glass{ background:rgba(255,255,255,.94); }
}

/* ============================================================
   顶栏
   ============================================================ */
.topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:14px;
}
.brand{ display:flex; align-items:center; gap:14px; }
.brand-mark{
  width:50px; height:50px;
  flex:none;
  display:grid; place-items:center;
  border-radius:6px;
  overflow: hidden;
}
.brand-mark img{width: 100%;height: 100%;}
.brand-text h1{
  font-size:clamp(1.1rem, 2.8vw, 1.4rem);
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--text);
}
.brand-text p{
  margin:0;
  font-size:.78rem;
  color:var(--muted);
}
.sync-badge{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:9px 17px;
  border-radius:999px;
  font-size:.76rem;
  font-weight:500;
  color:var(--muted);
  background:var(--glass-hi);
  -webkit-backdrop-filter:blur(8px) saturate(150%);
  backdrop-filter:blur(8px) saturate(150%);
  border:1px solid var(--glass-border);
  box-shadow:var(--shadow-xs);
}
.sync-badge .dot{
  width:8px; height:8px;
  flex:none;
  border-radius:50%;
  background:var(--green);
  animation:pulse 2.4s ease-out infinite;
}
.sync-badge.is-lost .dot{ background:var(--amber); animation:none; }
@keyframes pulse{
  0%  { box-shadow:0 0 0 0 rgba(21,128,61,.5); }
  70% { box-shadow:0 0 0 8px rgba(21,128,61,0); }
  100%{ box-shadow:0 0 0 0 rgba(21,128,61,0); }
}

/* ============================================================
   主时钟
   ============================================================ */
.clock-card{
  position:relative;
  padding:clamp(44px, 7vw, 76px) clamp(16px, 4vw, 40px) clamp(30px, 5vw, 48px);
  text-align:center;
  border-radius:var(--r-xl);
  overflow:hidden;
}
.clock-tools{
  position:absolute;
  top:16px; right:16px;
  display:flex;
  gap:9px;
  z-index:3;
}
.icon-btn{
  width:42px; height:42px;
  display:grid; place-items:center;
  border-radius:12px;
  font-size:1rem;
  line-height:1;
  color:var(--muted);
  background:rgba(255,255,255,.78);
  border:1px solid var(--glass-border);
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
  box-shadow:var(--shadow-xs);
  cursor:pointer;
  transition:transform .18s ease, color .18s ease, box-shadow .18s ease, background .18s ease;
  -webkit-tap-highlight-color:transparent;
}
.icon-btn:hover{
  color:var(--blue-deep);
  background:#fff;
  transform:translateY(-2px);
  box-shadow:0 12px 24px -14px rgba(29,78,216,.45);
}
.icon-btn:active{ transform:translateY(0); }
.icon-btn.is-muted{ opacity:.6; }
.icon-btn:focus-visible{ outline:2px solid var(--blue); outline-offset:2px; }
.clock-time{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  justify-content:center;
  margin:0;
  font-family:var(--font-mono);
  font-size:clamp(2.7rem, 12.5vw, 7.6rem);
  font-weight:800;
  line-height:1;
  letter-spacing:-.028em;
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  color:var(--blue-deep);
}
.clock-time .ms{
  font-size:.28em;
  font-weight:700;
  letter-spacing:0;
  margin-left:.09em;
  color:var(--faint);
}
.clock-meta{
  position:relative;
  margin:clamp(20px, 3.4vw, 34px) 0 0;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  gap:10px 16px;
  font-size:clamp(.88rem, 2.2vw, 1.02rem);
  font-weight:600;
  font-variant-numeric:tabular-nums;
}
.clock-meta .sep{
  width:5px; height:5px;
  border-radius:50%;
  background:rgba(100,116,139,.35);
}
.meta-date{  color:var(--text-soft); }
.meta-week{  color:var(--blue); }
.meta-lunar{ color:var(--muted); }

/* ============================================================
   时间对比
   ============================================================ */
.compare{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(250px, 1fr));
  gap:16px;
}
.compare-card{
  position:relative;
  padding:24px 26px;
  border-radius:var(--r-lg);
  overflow:hidden;
  transition:transform .22s ease, box-shadow .22s ease;
}
.compare-card:hover{
  transform:translateY(-3px);
  box-shadow:var(--shadow-lg), inset 0 1px 0 rgba(255,255,255,.9);
}
.compare-card::after{
  content:"";
  position:absolute;
  left:0; top:0;
  width:100%; height:4px;
}
.compare-card.is-server::after{ background:var(--blue); }
.compare-card.is-local::after{  background:#cbd5e1; }
.compare-card.is-stats::after{  background:var(--teal); }
.compare-card .label{
  margin:0;
  font-size:.76rem;
  font-weight:600;
  letter-spacing:.03em;
  color:var(--muted);
}
.compare-card .time{
  margin:8px 0 5px;
  font-family:var(--font-mono);
  font-size:clamp(1.55rem, 4.6vw, 2.15rem);
  font-weight:800;
  line-height:1.14;
  letter-spacing:-.01em;
  font-variant-numeric:tabular-nums;
}
.compare-card.is-server .time{ color:var(--blue-deep); }
.compare-card.is-local  .time{ color:var(--faint); }
.compare-card .status{ margin:0; font-size:.75rem; color:var(--faint); }
.compare-card.is-server .status{ color:var(--green); font-weight:600; }
.diff-chip{
  display:inline-block;
  margin-top:14px;
  padding:5px 14px;
  border-radius:999px;
  font-size:.73rem;
  font-weight:700;
  font-variant-numeric:tabular-nums;
  color:var(--teal);
  background:rgba(13,148,136,.09);
  border:1px solid rgba(13,148,136,.22);
}
.diff-chip.is-off{
  color:var(--amber);
  background:rgba(180,83,9,.09);
  border-color:rgba(180,83,9,.24);
}
.stats-list{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:10px 14px;
  margin-top:10px;
}
.stats-item dt{
  font-size:.74rem;
  color:var(--muted);
  line-height:1.55;
}
.stats-item dd{
  margin:2px 0 0;
  font-family:var(--font-mono);
  font-size:1.05rem;
  font-weight:800;
  color:var(--text-soft);
  font-variant-numeric:tabular-nums;
}

/* ============================================================
   区块标题
   ============================================================ */
.section-title{
  display:flex;
  align-items:center;
  gap:9px;
  margin:0 0 16px;
  font-size:1.05rem;
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--text);
  width:fit-content;
}

/* ============================================================
   世界时间
   ============================================================ */
.world-grid{
  display:grid;
  grid-template-columns:repeat(5, minmax(0, 1fr));
  gap:12px;
}
.world-item{
  padding:17px 17px 15px;
  border-radius:var(--r-md);
  background:var(--glass);
  -webkit-backdrop-filter:blur(10px) saturate(150%);
  backdrop-filter:blur(10px) saturate(150%);
  border:1px solid var(--glass-border);
  box-shadow:var(--shadow-xs), inset 0 1px 0 rgba(255,255,255,.85);
  transition:transform .22s ease, box-shadow .22s ease, background .22s ease;
}
.world-item:hover{
  transform:translateY(-3px);
  background:var(--glass-hover);
  box-shadow:var(--shadow-sm), inset 0 1px 0 rgba(255,255,255,.9);
}
.world-city{
  display:flex;
  align-items:center;
  gap:7px;
  margin:0;
  font-size:.78rem;
  font-weight:600;
  color:var(--muted);
}
.world-city::before{
  content:"";
  width:7px; height:7px;
  border-radius:50%;
  flex:none;
  background:var(--blue);
}
.world-item:nth-child(4n+2) .world-city::before{ background:var(--indigo); }
.world-item:nth-child(4n+3) .world-city::before{ background:var(--teal); }
.world-item:nth-child(4n)   .world-city::before{ background:var(--slate); }
.world-time{
  margin:7px 0 2px;
  font-family:var(--font-mono);
  font-size:1.38rem;
  font-weight:800;
  line-height:1.2;
  letter-spacing:-.01em;
  font-variant-numeric:tabular-nums;
  color:var(--text);
}
.world-date{
  margin:0;
  font-size:.72rem;
  color:var(--faint);
  font-variant-numeric:tabular-nums;
}
.world-tz{
  margin:9px 0 0;
  font-size:.65rem;
  font-weight:700;
  letter-spacing:.08em;
  color:rgba(100,116,139,.7);
}
.world-time.is-diff{ color:var(--amber); }
.world-date.is-diff{ color:rgba(180,83,9,.8); }
@media (max-width:1024px){ .world-grid{ grid-template-columns:repeat(4, minmax(0, 1fr)); } }
@media (max-width:820px){  .world-grid{ grid-template-columns:repeat(3, minmax(0, 1fr)); } }
@media (max-width:560px){  .world-grid{ grid-template-columns:repeat(2, minmax(0, 1fr)); } }

/* ============================================================
   特性
   ============================================================ */
.features-list{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(212px, 1fr));
  gap:15px;
}
.feature-card{
  padding:24px;
  border-radius:var(--r-lg);
  background:var(--glass);
  -webkit-backdrop-filter:blur(10px) saturate(150%);
  backdrop-filter:blur(10px) saturate(150%);
  border:1px solid var(--glass-border);
  box-shadow:var(--shadow-xs), inset 0 1px 0 rgba(255,255,255,.85);
  transition:transform .22s ease, box-shadow .22s ease, background .22s ease;
}
.feature-card:hover{
  transform:translateY(-3px);
  background:var(--glass-hover);
  box-shadow:var(--shadow-sm), inset 0 1px 0 rgba(255,255,255,.9);
}
.feature-card .icon{
  width:44px; height:44px;
  display:grid; place-items:center;
  margin:0 0 15px;
  border-radius:13px;
  font-size:1.14rem;
  color:#fff;
  background:var(--blue);
  box-shadow:0 10px 22px -12px rgba(37,99,235,.5);
}
.feature-card:nth-child(2) .icon{ background:var(--indigo); box-shadow:0 10px 22px -12px rgba(79,70,229,.5); }
.feature-card:nth-child(3) .icon{ background:var(--teal);   box-shadow:0 10px 22px -12px rgba(13,148,136,.5); }
.feature-card:nth-child(4) .icon{ background:var(--slate);  box-shadow:0 10px 22px -12px rgba(100,116,139,.5); }
.feature-card h3{
  margin:0 0 7px;
  font-size:.96rem;
  font-weight:800;
  letter-spacing:-.005em;
  color:var(--text);
}
.feature-card p{
  margin:0;
  font-size:.8rem;
  line-height:1.8;
  color:var(--muted);
}

/* ============================================================
   知识区块
   ============================================================ */
.info-card{
  padding:clamp(24px, 4vw, 36px);
  border-radius:var(--r-xl);
  background:var(--glass);
  -webkit-backdrop-filter:blur(12px) saturate(150%);
  backdrop-filter:blur(12px) saturate(150%);
  border:1px solid var(--glass-border);
  box-shadow:var(--shadow-sm), inset 0 1px 0 rgba(255,255,255,.9);
}
.info-card h2{
  margin:0 0 8px;
  font-size:1.05rem;
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--text);
  width:fit-content;
}
.info-card p{
  margin:0 0 13px;
  font-size:.85rem;
  line-height:2;
  color:var(--muted);
}
.info-card p:last-child{ margin-bottom:0; }
.info-card header{ margin-bottom:16px; }
.meta-line{
  margin:0;
  font-size:.74rem;
  color:var(--faint);
  font-variant-numeric:tabular-nums;
}
.meta-line time{ font-weight:600; }
.key-point{
  display:block;
  margin:0 0 18px;
  padding:14px 18px;
  border-left:3px solid var(--blue);
  border-radius:0 var(--r-sm) var(--r-sm) 0;
  background:rgba(37,99,235,.06);
  font-size:.86rem;
  line-height:1.85;
  color:var(--text-soft);
  font-weight:600;
}
.info-card a{
  color:var(--blue-deep);
  text-decoration:none;
  border-bottom:1px solid rgba(37,99,235,.3);
  transition:border-color .16s ease, color .16s ease;
}
.info-card a:hover{
  color:var(--blue);
  border-bottom-color:var(--blue);
}
.info-card abbr{
  text-decoration:none;
  border-bottom:1px dotted rgba(100,116,139,.5);
  cursor:help;
}
.industry-list{
  display:grid;
  gap:14px;
  margin:8px 0 0;
}
.industry-item{
  padding:16px 18px;
  border-radius:var(--r-md);
  background:rgba(255,255,255,.55);
  border:1px solid var(--glass-border);
}
.industry-item h3{
  display:flex;
  align-items:center;
  gap:8px;
  margin:0 0 6px;
  font-size:.88rem;
  font-weight:800;
  color:var(--text-soft);
}
.industry-item h3 .badge{
  display:inline-block;
  padding:2px 9px;
  border-radius:999px;
  font-size:.65rem;
  font-weight:700;
  letter-spacing:.04em;
  color:#fff;
  background:var(--blue);
}
.industry-item:nth-child(2) h3 .badge{ background:var(--teal); }
.industry-item:nth-child(3) h3 .badge{ background:var(--indigo); }
.industry-item:nth-child(4) h3 .badge{ background:var(--slate); }
.industry-item p{
  margin:0;
  font-size:.82rem;
  line-height:1.9;
  color:var(--muted);
}
.case-block{
  margin-top:16px;
  padding:16px 18px;
  border-radius:var(--r-md);
  background:rgba(180,83,9,.06);
  border-left:3px solid var(--amber);
}
.case-block strong{
  display:block;
  margin-bottom:5px;
  font-size:.78rem;
  font-weight:800;
  color:var(--amber);
  letter-spacing:.03em;
}
.case-block p{
  margin:0;
  font-size:.82rem;
  line-height:1.9;
  color:var(--text-soft);
}
.table-wrap{
  overflow-x:auto;
  margin-top:16px;
  border-radius:var(--r-md);
  border:1px solid var(--glass-border);
}
table.precision{
  width:100%;
  border-collapse:collapse;
  font-size:.8rem;
  min-width:520px;
}
table.precision caption{
  caption-side:top;
  text-align:left;
  padding:0 0 10px;
  font-size:.78rem;
  color:var(--muted);
}
table.precision th,
table.precision td{
  padding:11px 14px;
  text-align:left;
  border-bottom:1px solid rgba(255,255,255,.85);
}
table.precision thead th{
  background:rgba(37,99,235,.08);
  font-weight:800;
  color:var(--text-soft);
  font-size:.76rem;
  letter-spacing:.03em;
  white-space:nowrap;
}
table.precision tbody tr:last-child td{ border-bottom:none; }
table.precision tbody tr:hover{ background:rgba(255,255,255,.55); }
table.precision td:first-child{ font-weight:700; color:var(--text-soft); white-space:nowrap; }
table.precision td:nth-child(2){
  font-family:var(--font-mono);
  font-weight:700;
  color:var(--blue-deep);
  white-space:nowrap;
}
table.precision td:last-child{ color:var(--muted); }

/* ============================================================
   FAQ
   ============================================================ */
.faq-list{
  display:grid;
  gap:12px;
}
.faq-item{
  padding:18px 20px;
  border-radius:var(--r-md);
  background:rgba(255,255,255,.55);
  border:1px solid var(--glass-border);
}
.faq-item dt{
  margin-bottom:6px;
  font-size:.88rem;
  font-weight:800;
  color:var(--text-soft);
}
.faq-item dd{
  margin:0;
  font-size:.82rem;
  line-height:1.9;
  color:var(--muted);
}

/* ============================================================
   链接区块
   ============================================================ */
.links-card{
  padding:clamp(22px, 3.5vw, 30px);
  border-radius:var(--r-xl);
  background:var(--glass);
  -webkit-backdrop-filter:blur(12px) saturate(150%);
  backdrop-filter:blur(12px) saturate(150%);
  border:1px solid var(--glass-border);
  box-shadow:var(--shadow-sm), inset 0 1px 0 rgba(255,255,255,.9);
}
.links-card h2, .links-card h3{
  margin:0 0 15px;
  font-size:.98rem;
  font-weight:800;
  color:var(--text);
  width:fit-content;
}
.links-list{
  display:flex;
  flex-wrap:wrap;
  gap:9px;
}
.links-list a{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:8px 14px;
  border-radius:999px;
  font-size:.77rem;
  font-weight:500;
  color:var(--muted);
  text-decoration:none;
  background:rgba(255,255,255,.72);
  border:1px solid var(--glass-border);
  box-shadow:0 3px 10px -6px rgba(30,41,80,.18);
  transition:color .18s ease, background .18s ease, transform .18s ease, box-shadow .18s ease;
}
.links-list a:hover{
  color:var(--blue-deep);
  background:#fff;
  transform:translateY(-2px);
  box-shadow:0 10px 22px -14px rgba(29,78,216,.5);
}
.links-list a span{ font-size:.88rem; line-height:1; }

/* ============================================================
   页脚
   ============================================================ */
.footer{
  margin-top:8px;
  padding-top:24px;
  border-top:1px solid rgba(255,255,255,.9);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  font-size:.76rem;
  color:var(--faint);
}
.footer p{ margin:0; }
.footer nav{ display:flex; gap:18px; }
.footer a{
  color:var(--faint);
  text-decoration:none;
  font-weight:500;
  transition:color .16s ease;
}
.footer a:hover{ color:var(--blue-deep); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:600px){
  .app{ width:min(100% - 22px, 1140px); padding-top:18px; gap:20px; }
  .brand-mark{ width:44px; height:44px; border-radius:13px; font-size:18px; }
  .sync-badge{ width:100%; justify-content:center; }
  .clock-tools{ top:11px; right:11px; }
  .icon-btn{ width:37px; height:37px; border-radius:10px; font-size:.92rem; }
  .compare-card{ padding:20px 22px; }
  .world-time{ font-size:1.22rem; }
  .stats-list{ grid-template-columns:1fr 1fr; }
  body{ background-attachment:scroll; }
}

@media (prefers-reduced-motion:reduce){
  *{ animation-duration:.001ms !important; transition-duration:.001ms !important; }
}