@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/static/pretendard.css');
:root{ --ink:#14171a; --mut:#657786; --line:#e6ecf0; --bg:#f7f9fa; --card:#fff; --accent:#0f1419; --accent-ink:#fff;
  --accent-soft:color-mix(in srgb, var(--accent) 8%, transparent); }
*{ box-sizing:border-box; }
body{ margin:0; background:var(--bg); color:var(--ink); position:relative; overflow-x:hidden;
  font-family:'Pretendard',-apple-system,BlinkMacSystemFont,"Segoe UI","Apple SD Gothic Neo","Noto Sans KR",sans-serif;
  line-height:1.6; -webkit-font-smoothing:antialiased; }
body::before{ content:''; position:fixed; top:-260px; left:50%; transform:translateX(-50%); width:640px; height:420px;
  background:radial-gradient(circle, #1d9bf0 0%, transparent 68%); opacity:.10; filter:blur(50px);
  pointer-events:none; z-index:0; }
a{ color:inherit; text-decoration:none; }
.site-header{ display:flex; align-items:center; justify-content:space-between;
  padding:16px 22px; background:rgba(255,255,255,.85); backdrop-filter:blur(10px); -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line); position:sticky; top:0; z-index:10; }
.logo{ font-weight:800; font-size:16.5px; display:flex; align-items:center; gap:8px; }
.logo .dot{ width:10px; height:10px; border-radius:50%; background:var(--accent); display:inline-block;
  box-shadow:0 0 0 4px var(--accent-soft); }
.site-header nav a{ margin-left:18px; font-size:13.5px; color:var(--mut); font-weight:600; transition:color .15s; }
.site-header nav a:hover{ color:var(--accent); }
.wrap{ max-width:720px; margin:0 auto; padding:40px 20px 60px; position:relative; z-index:1; }
h1{ font-size:31px; font-weight:800; letter-spacing:-.03em; margin:0 0 10px; }
.grad{ background:linear-gradient(135deg, #1d9bf0, #7c3aed);
  -webkit-background-clip:text; background-clip:text; color:transparent; }
.lead{ color:var(--mut); margin:0 0 8px; font-size:15px; }
.badge{ display:inline-flex; align-items:center; gap:6px; font-size:12px; font-weight:700; color:#1d9bf0;
  background:#1d9bf014; border:1px solid #1d9bf030;
  padding:6px 12px; border-radius:999px; margin-bottom:16px; }
.calc-wrap{ background:var(--card); border:1px solid var(--line); border-radius:20px; padding:26px;
  margin:20px 0 28px; box-shadow:0 2px 10px rgba(20,23,26,.04), 0 12px 32px -12px rgba(20,23,26,.10); }
.inputrow{ display:flex; gap:10px; }
.inputrow input{ flex:1; padding:13px 15px; font-size:15px; border:1px solid var(--line); border-radius:14px;
  font-family:inherit; background:#fafbfc; transition:border-color .15s, box-shadow .15s, background .15s; }
.inputrow input:focus{ outline:none; border-color:#1d9bf0; background:#fff; box-shadow:0 0 0 3px #1d9bf01f; }
.btn{ font:inherit; font-size:14px; font-weight:700; padding:0 24px; border-radius:14px; border:none;
  background:linear-gradient(135deg,#1d9bf0,#0c7abf); color:#fff; cursor:pointer; transition:all .2s; }
.btn:hover:not(:disabled){ transform:translateY(-1px); box-shadow:0 6px 16px -4px #1d9bf0; }
.btn:disabled{ background:#c6cbd1; cursor:not-allowed; }
.hint{ font-size:12.5px; color:var(--mut); margin-top:10px; }
.error{ margin-top:16px; padding:12px 16px; border-radius:12px; background:#ffe3e3; color:#c0392b; font-size:13.5px; font-weight:600; }
.result{ margin-top:20px; }
.tweetmeta{ display:flex; gap:12px; align-items:center; margin-bottom:14px; }
.tweetmeta img{ width:120px; border-radius:14px; }
.tweetmeta .txt{ font-size:13.5px; color:var(--mut); }
.tweetmeta b{ display:block; font-size:14px; color:var(--ink); }
.qualities{ display:flex; flex-direction:column; gap:8px; }
.qrow{ display:flex; align-items:center; justify-content:space-between; padding:12px 16px;
  background:#fafbfc; border:1px solid var(--line); border-radius:14px; font-size:13.5px; font-weight:600; }
.qrow a{ color:#fff; background:linear-gradient(135deg,#1d9bf0,#0c7abf); padding:8px 16px; border-radius:999px; font-size:13px;
  transition:transform .15s; }
.qrow a:hover{ transform:translateY(-1px); }
.spin{ display:inline-block; width:16px; height:16px; border:2px solid #ccc; border-top-color:#1d9bf0;
  border-radius:50%; animation:sp .7s linear infinite; vertical-align:-3px; margin-right:6px; }
@keyframes sp{ to{ transform:rotate(360deg); } }
.note{ font-size:13.5px; color:#3a3a3a; margin-top:18px; line-height:1.85; background:var(--card);
  border:1px solid var(--line); border-radius:18px; padding:22px 24px; }
.note h2{ font-size:15.5px; margin:16px 0 6px; } .note h2:first-child{ margin-top:0; }
.related{ margin-top:28px; padding:20px 22px; background:#fff; border:1px solid var(--line); border-radius:18px; }
.related h3{ font-size:13px; color:var(--mut); margin:0 0 10px; }
.related a{ display:inline-block; margin:0 10px 6px 0; font-size:13.5px; font-weight:700; color:#1d9bf0; transition:opacity .15s; }
.related a:hover{ opacity:.7; }
.site-footer{ border-top:1px solid var(--line); background:#fff; padding:24px;
  text-align:center; font-size:12.5px; color:var(--mut); position:relative; z-index:1; }
.site-footer a{ color:#1d9bf0; }
@media(max-width:480px){ .inputrow{ flex-direction:column; } .btn{ padding:13px; } }