/* ============================================================
   Timestamp Tool - Shared Styles
   ============================================================ */
:root{
  --bg: #f4f6fb;
  --surface: #ffffff;
  --surface-alt: #f8fafc;
  --border: #e5e9f2;
  --text: #1f2937;
  --text-soft: #6b7280;
  --muted: #9ca3af;
  --primary: #2563eb;
  --primary-strong: #1d4ed8;
  --primary-soft: #eff6ff;
  --accent: #06b6d4;
  --success: #16a34a;
  --success-soft: #f0fdf4;
  --danger: #dc2626;
  --code-bg: #0f172a;
  --code-text: #e2e8f0;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 3px rgba(15,23,42,.06), 0 8px 24px rgba(15,23,42,.05);
  --shadow-lg: 0 12px 40px rgba(15,23,42,.12);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
          "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SF Mono", SFMono-Regular, ui-monospace, "JetBrains Mono",
          Menlo, Consolas, "Liberation Mono", monospace;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  font-size:15px;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
button{font-family:inherit;cursor:pointer}
input,select,textarea{font-family:inherit;font-size:14px;color:var(--text)}

/* ---------- Layout ---------- */
.container{max-width:1120px;margin:0 auto;padding:0 20px}
main{padding:28px 0 60px}

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.85);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{
  display:flex;align-items:center;gap:10px;color:var(--text);font-weight:700;font-size:18px;
}
.brand:hover{text-decoration:none}
.brand .logo{
  width:38px;height:38px;border-radius:10px;flex-shrink:0;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;
}
.nav-links{display:flex;gap:4px;flex-wrap:wrap}
.nav-links a{
  color:var(--text-soft);padding:7px 8px;border-radius:8px;font-size:14px;font-weight:500;
}
.nav-links a:hover{background:var(--surface-alt);color:var(--primary);text-decoration:none}
.lang-switch{display:flex;background:var(--surface-alt);border:1px solid var(--border);border-radius:9px;overflow:hidden;flex-shrink:0}
.lang-switch a{
  padding:6px 14px;font-size:13px;font-weight:600;color:var(--text-soft);
}
.lang-switch a.active{background:var(--primary);color:#fff}
.lang-switch a:not(.active):hover{color:var(--primary);text-decoration:none}

/* ---------- Hero ---------- */
.hero{text-align:center;padding:36px 0 12px}
.hero h1{font-size:clamp(26px,4vw,38px);font-weight:800;letter-spacing:-.5px}
.hero h1 span{background:linear-gradient(120deg,var(--primary),var(--accent));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero p{color:var(--text-soft);margin-top:10px;font-size:16px}

/* ---------- Live clock ---------- */
.live-ticker{
  margin:26px auto 8px;max-width:900px;display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:14px;
}
.ticker-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:18px 20px;box-shadow:var(--shadow);text-align:left;
}
.ticker-card .k{font-size:12.5px;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.5px}
.ticker-card .v{font-family:var(--mono);font-size:22px;font-weight:700;margin-top:4px;color:var(--text);word-break:break-all}
.ticker-card .v.sm{font-size:17px}
.weekday{margin-top:2px;font-size:13px;color:var(--text-soft)}

/* ---------- Cards & sections ---------- */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:24px;box-shadow:var(--shadow);margin-top:20px;
}
.card h2{
  font-size:19px;font-weight:700;margin-bottom:4px;display:flex;align-items:center;gap:9px;
}
.card h2 .ic{width:30px;height:30px;border-radius:8px;background:var(--primary-soft);color:var(--primary);display:inline-flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0}
.card .sub{color:var(--text-soft);font-size:13.5px;margin-bottom:18px}
.card .sub:empty{display:none}

/* ---------- Forms ---------- */
.field{margin-bottom:14px}
.field label{display:block;font-size:13px;font-weight:600;margin-bottom:6px;color:var(--text)}
.field .hint{font-size:12px;color:var(--muted);margin-top:4px}
.control{
  width:100%;padding:11px 13px;border:1px solid var(--border);border-radius:var(--radius-sm);
  background:var(--surface);transition:border-color .15s, box-shadow .15s;
}
.control:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
textarea.control{resize:vertical;min-height:120px;font-family:var(--mono);font-size:13.5px;line-height:1.7}
.dateline{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.btn-row{display:flex;gap:10px;margin-top:4px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:7px;border:none;border-radius:var(--radius-sm);
  padding:10px 20px;font-size:14px;font-weight:600;color:#fff;
  background:linear-gradient(120deg,var(--primary),var(--primary-strong));
  transition:transform .05s, opacity .2s, box-shadow .2s;box-shadow:0 4px 12px rgba(37,99,235,.25);
}
.btn:hover{opacity:.92;box-shadow:0 6px 16px rgba(37,99,235,.32)}
.btn:active{transform:translateY(1px)}
.btn.ghost{background:var(--primary-soft);color:var(--primary);box-shadow:none;font-weight:600}
.btn.ghost:hover{background:#dbeafe;opacity:1}
.btn.plain{background:transparent;color:var(--primary);box-shadow:none;border:1px solid var(--primary);padding:8px 14px}
input[type=checkbox]{width:16px;height:16px;accent-color:var(--primary);vertical-align:middle}
.inline-chk{display:inline-flex;align-items:center;gap:7px;font-size:13.5px;color:var(--text-soft);cursor:pointer;margin-right:16px}

/* ---------- Result ---------- */
.result{
  margin-top:18px;border:1px dashed var(--primary);border-radius:var(--radius-sm);
  background:var(--primary-soft);padding:16px;display:none;
}
.result.show{display:block}
.result .label{font-size:12px;font-weight:700;color:var(--primary);text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px}
.result-row{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:5px 0;border-bottom:1px dashed rgba(37,99,235,.15)}
.result-row:last-child{border-bottom:none}
.result-row .rk{font-size:13px;color:var(--text-soft)}
.result-row .rv{font-family:var(--mono);font-weight:600;font-size:13.5px;word-break:break-all;text-align:right}
.copy-btn{border:none;background:transparent;color:var(--muted);font-size:16px;padding:2px 4px;border-radius:5px;flex-shrink:0}
.copy-btn:hover{color:var(--primary);background:var(--surface)}
.pre-result{
  display:none;margin-top:18px;font-family:var(--mono);font-size:13.5px;line-height:1.8;
  background:var(--code-bg);color:var(--code-text);border-radius:var(--radius-sm);padding:18px;
}
.pre-result.show{display:block}

/* ---------- Format table ---------- */
.fmt-table{width:100%;border-collapse:collapse;margin-top:14px}
.fmt-table td,.fmt-table th{padding:10px 12px;border-bottom:1px solid var(--border);text-align:left}
.fmt-table td:first-child{font-weight:600;white-space:nowrap;color:var(--text-soft);font-size:13.5px;width:38%}
.fmt-table td:last-child{font-family:var(--mono);font-size:13.5px;word-break:break-all}
.fmt-table tr:hover td{background:var(--surface-alt)}

.mono{font-family:var(--mono)}
.tag-ok{display:inline-block;background:var(--success-soft);color:var(--success);font-size:12px;font-weight:700;padding:3px 9px;border-radius:20px}
.tag-bad{display:inline-block;background:#fef2f2;color:var(--danger);font-size:12px;font-weight:700;padding:3px 9px;border-radius:20px}

/* ---------- Batch ---------- */
.batch-input{position:relative}
.batch-actions{margin-top:10px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px}
.batch-actions .note{font-size:12px;color:var(--muted)}

/* ---------- Code tabs ---------- */
.tabs{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:4px}
.tab-btn{
  border:1px solid var(--border);background:var(--surface-alt);color:var(--text-soft);
  padding:7px 16px;border-radius:20px;font-size:13.5px;font-weight:600;
}
.tab-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.code-block{
  position:relative;display:none;margin-top:10px;background:var(--code-bg);
  border-radius:var(--radius-sm);padding:18px;overflow:auto;
}
.code-block.show{display:block}
.code-block pre{font-family:var(--mono);font-size:13px;line-height:1.65;color:var(--code-text);white-space:pre;overflow-x:auto}
.code-block .copy-btn{position:absolute;top:10px;right:10px;background:rgba(255,255,255,.08);color:var(--code-text);padding:5px 10px;border-radius:6px;font-size:12px;font-weight:600}
.code-block .copy-btn:hover{background:rgba(255,255,255,.18);color:#fff}

/* ---------- Scrollable lang table ---------- */
.langtable-wrap{overflow-x:auto;margin-top:14px}
.langtable{width:100%;border-collapse:collapse;min-width:520px}
.langtable th,.langtable td{padding:11px 13px;text-align:left;border-bottom:1px solid var(--border);font-size:13.5px}
.langtable th{background:var(--surface-alt);font-weight:700}
.langtable td:first-child{font-family:var(--mono);font-weight:700;color:var(--primary);white-space:nowrap}
.langtable td code{font-family:var(--mono);font-size:12.5px;background:var(--surface-alt);padding:2px 6px;border-radius:5px;word-break:break-all}

/* ---------- Knowledge / FAQ ---------- */
.knowledge-card h2{margin-bottom:12px}
.knowledge-card p,.knowledge-card li,.knowledge-card blockquote{color:var(--text-soft);font-size:14.5px}
.knowledge-card ul,.knowledge-card ol{margin:8px 0 0 20px}
.knowledge-card li{margin:6px 0}
.knowledge-card strong{color:var(--text)}
.faq-item{border:1px solid var(--border);border-radius:var(--radius-sm);margin-top:10px;overflow:hidden;background:var(--surface)}
.faq-q{
  width:100%;text-align:left;background:none;border:none;padding:14px 16px;
  font-size:14.5px;font-weight:600;color:var(--text);display:flex;justify-content:space-between;align-items:center;
}
.faq-q .arr{transition:transform .2s}
.faq-item.open .faq-q .arr{transform:rotate(180deg)}
.faq-a{display:none;padding:0 16px 14px;color:var(--text-soft);font-size:14px;border-top:1px dashed var(--border)}
.faq-item.open .faq-a{display:block}

/* ---------- Copy toast ---------- */
.toast{
  position:fixed;bottom:26px;left:50%;transform:translateX(-50%) translateY(20px);
  background:#111827;color:#fff;padding:11px 22px;border-radius:10px;font-size:14px;
  opacity:0;pointer-events:none;transition:opacity .25s,transform .25s;z-index:999;box-shadow:var(--shadow-lg);
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--border);background:var(--surface);padding:26px 0 34px;text-align:center;color:var(--muted);font-size:13px}
.site-footer a{color:var(--text-soft)}

/* ---------- Responsive ---------- */
@media (max-width:860px){
  .live-ticker{grid-template-columns:1fr}
  .grid2{grid-template-columns:1fr}
  .nav-links{display:none}
}
@media (max-width:520px){
  .dateline{grid-template-columns:1fr}
  .container{padding:0 14px}
  .card{padding:18px}
}