:root{
  --blue:#1a73e8; --blue-d:#1557b0; --ink:#1f2430; --muted:#6b7280;
  --line:#e6e8eb; --bg:#f7f9fc; --green:#16a34a; --red:#dc2626;
  --radius:14px; --shadow:0 1px 3px rgba(16,24,40,.06),0 8px 24px rgba(16,24,40,.05);
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'IBM Plex Sans Thai',system-ui,sans-serif;color:var(--ink);
  background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:960px;margin:0 auto;padding:0 20px}
.muted{color:var(--muted)}
h1{font-size:2rem;font-weight:700;line-height:1.25;margin-bottom:.4em}
h2{font-size:1.5rem;font-weight:700;margin-bottom:.6em}
h3{font-size:1.1rem;font-weight:600;margin-bottom:.4em}
code{background:#eef1f6;padding:.1em .4em;border-radius:6px;font-size:.92em;word-break:break-all}

/* header */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.nav{display:flex;align-items:center;justify-content:space-between;height:62px}
.brand{font-weight:700;font-size:1.15rem;color:var(--ink);display:flex;align-items:center;gap:8px}
.brand:hover{text-decoration:none}
.brand .muted{font-weight:400}
.logo{background:var(--blue);color:#fff;width:30px;height:30px;border-radius:8px;
  display:grid;place-items:center;font-weight:700}
.menu{display:flex;align-items:center;gap:18px}
.menu a{color:var(--ink);font-size:.95rem}
.menu a:hover{color:var(--blue);text-decoration:none}

/* buttons */
.btn-primary,.btn-ghost{display:inline-block;border-radius:10px;font-weight:600;
  cursor:pointer;border:1px solid transparent;font-family:inherit;font-size:.95rem;
  padding:.6em 1.2em;transition:.15s}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-d);text-decoration:none}
.btn-primary.lg{padding:.8em 1.6em;font-size:1.05rem}
.btn-primary.sm{padding:.45em 1em;font-size:.9rem}
.btn-primary.full{width:100%}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue);text-decoration:none}

.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;box-shadow:var(--shadow)}

/* hero */
.hero{padding:54px 0 30px;text-align:center}
.hero h1{font-size:2.4rem}
.lead{font-size:1.12rem;color:var(--muted);max-width:640px;margin:0 auto 28px}
.shorten-form{max-width:680px;margin:0 auto;text-align:left}
.field-label{display:block;font-weight:600;margin-bottom:8px}
.input-row{display:flex;gap:10px}
.input-row input{flex:1}
input,textarea{width:100%;padding:.75em .9em;border:1px solid var(--line);
  border-radius:10px;font-family:inherit;font-size:1rem;background:#fff}
input:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(26,115,232,.12)}
.custom-toggle{margin-top:14px}
.custom-toggle summary{cursor:pointer;color:var(--blue);font-size:.92rem;font-weight:500}
.custom-row{display:flex;align-items:center;gap:0;margin:10px 0 4px;
  border:1px solid var(--line);border-radius:10px;overflow:hidden}
.custom-row .prefix{padding:.75em .8em;background:#f1f4f9;color:var(--muted);white-space:nowrap}
.custom-row input{border:none;border-radius:0}
.custom-row input:focus{box-shadow:none}

.result{max-width:680px;margin:0 auto 18px;text-align:left;border-color:var(--blue)}
.result-row{display:flex;gap:10px}
.result-row input{font-weight:600;color:var(--blue)}
.result-meta{margin-top:10px;font-size:.9rem;word-break:break-all}
.hint{margin-top:12px;font-size:.92rem;background:#f1f7ff;padding:10px 12px;border-radius:8px}

.stats-strip{display:flex;justify-content:center;gap:40px;margin-top:34px;flex-wrap:wrap}
.stats-strip strong{display:block;font-size:1.6rem;color:var(--blue)}
.stats-strip span{font-size:.88rem;color:var(--muted)}

.alert{padding:.7em 1em;border-radius:10px;margin-bottom:14px;font-size:.95rem}
.alert.error{background:#fef2f2;color:var(--red);border:1px solid #fecaca}
.alert.ok{background:#f0fdf4;color:var(--green);border:1px solid #bbf7d0}

/* answer box (AEO) */
.answer-box{margin:30px auto;background:#fff;border:1px solid var(--line);
  border-left:4px solid var(--blue);border-radius:12px;padding:20px 24px;max-width:820px}

.section{padding:36px 0;max-width:820px}
.steps{list-style:none;display:grid;gap:18px;margin-top:10px}
.steps li{display:flex;gap:16px;align-items:flex-start}
.steps .num{background:var(--blue);color:#fff;width:34px;height:34px;border-radius:50%;
  display:grid;place-items:center;font-weight:700;flex-shrink:0}

/* compare */
.compare{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.plan{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.plan.featured{border-color:var(--blue);box-shadow:var(--shadow)}
.plan h3{display:flex;align-items:center;gap:10px;font-size:1.25rem}
.tag{font-size:.72rem;background:#eef1f6;color:var(--muted);padding:.2em .6em;border-radius:99px;font-weight:600}
.tag.green{background:#dcfce7;color:var(--green)}
.check{list-style:none;margin:16px 0;display:grid;gap:9px}
.check li{padding-left:26px;position:relative}
.check li:before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:700}
.check li.no{color:var(--muted)}
.check li.no:before{content:"✕";color:#cbd5e1}

/* article */
.article{max-width:760px;padding:36px 20px}
.article h3{margin-top:26px;font-size:1.2rem}
.article p{margin-bottom:14px}
.cta-inline{background:#f1f7ff;padding:16px 18px;border-radius:12px;margin-top:24px}

/* faq */
.faq{display:grid;gap:10px}
.faq details{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 18px}
.faq summary{cursor:pointer;font-weight:600}
.faq details[open] summary{margin-bottom:8px}

/* auth */
.auth{padding:50px 0;display:flex;justify-content:center}
.auth-card{width:100%;max-width:420px}
.auth-card.wide{max-width:560px}
.auth-card label{display:block;font-weight:600;margin:14px 0 6px;font-size:.92rem}
.auth-alt{margin-top:18px;text-align:center;color:var(--muted)}
.back{display:inline-block;margin-bottom:10px;font-size:.9rem}

/* dashboard */
.dash-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
.table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
.links-table{width:100%;border-collapse:collapse;min-width:620px}
.links-table th,.links-table td{padding:13px 16px;text-align:left;border-bottom:1px solid var(--line);font-size:.93rem}
.links-table th{background:#fafbfc;font-weight:600;color:var(--muted);font-size:.85rem}
.links-table tr:last-child td{border-bottom:none}
.truncate{max-width:240px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.actions{display:flex;gap:12px;white-space:nowrap}
.link-danger{background:none;border:none;color:var(--red);cursor:pointer;font-family:inherit;font-size:.93rem;padding:0}
.link-danger:hover{text-decoration:underline}
.empty{text-align:center;padding:50px 24px;display:grid;gap:10px;place-items:center}

/* stats */
.stat-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:18px 0}
.stat{text-align:center}
.stat span{display:block;font-size:2rem;font-weight:700;color:var(--blue)}
.stat label{color:var(--muted);font-size:.9rem}
.bars{display:flex;align-items:flex-end;gap:12px;height:170px;margin-top:18px;padding-top:10px}
.bar-col{flex:1;display:flex;flex-direction:column;align-items:center;height:100%;justify-content:flex-end;gap:4px}
.bar{width:100%;max-width:46px;background:var(--blue);border-radius:6px 6px 0 0;min-height:3px;transition:.3s}
.bar-val{font-size:.8rem;font-weight:600}
.bar-lbl{font-size:.78rem;color:var(--muted)}
.ref-table{width:100%;border-collapse:collapse;margin-top:8px}
.ref-table td{padding:9px 0;border-bottom:1px solid var(--line)}
.ref-table .num{text-align:right;font-weight:600}
.card h3{margin-bottom:6px}
.card+.card{margin-top:18px}

/* footer */
.site-footer{background:#fff;border-top:1px solid var(--line);margin-top:50px;padding:34px 0}
.foot{display:grid;gap:14px}
.brand.sm{font-size:1rem}
.foot-links{display:flex;gap:18px;flex-wrap:wrap}
.foot-links a{color:var(--muted);font-size:.9rem}
.copy{font-size:.85rem}

@media(max-width:680px){
  .hero h1{font-size:1.7rem}
  .compare{grid-template-columns:1fr}
  .stat-cards{grid-template-columns:1fr 1fr 1fr;gap:8px}
  .stat span{font-size:1.4rem}
  .input-row{flex-direction:column}
  .menu{gap:12px;font-size:.9rem}
  .menu a:not(.btn-primary){display:none}
  .menu .btn-primary{display:inline-block}
}