/* Light theme - không dùng Bootstrap */
:root{
  --bg:#ffffff;
  --card:#ffffff;
  --text:#0f172a;
  --muted:#64748b;
  --line:#e2e8f0;
  --brand:#0ea5e9;
  --brand2:#22c55e;
  --shadow: 0 12px 30px rgba(2,8,23,.08);
  --radius: 18px;
  --radius2: 12px;
  --container: 1100px;
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:linear-gradient(180deg,#f8fafc, #fff 30%, #fff);color:var(--text);font-family:var(--font)}
a{color:inherit;text-decoration:none}
.container{max-width:var(--container);margin:0 auto;padding:0 18px}
.topbar{position:sticky;top:0;background:rgba(255,255,255,.85);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line);z-index:30}
.topbar .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;gap:10px;align-items:center;font-weight:800;letter-spacing:.2px}
.brand-dot{width:12px;height:12px;border-radius:50%;background:conic-gradient(from 180deg,var(--brand),var(--brand2));box-shadow:0 0 0 4px rgba(14,165,233,.12)}
.nav{display:flex;gap:14px;align-items:center}
.nav a{padding:10px 12px;border-radius:12px;color:var(--muted);font-weight:650}
.nav a:hover{background:#f1f5f9;color:var(--text)}
.nav a.active{background:rgba(14,165,233,.12);color:#0369a1}
.nav-admin{border:1px solid var(--line)}
.hero{padding:38px 0 16px}
.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:18px;align-items:stretch}
@media(max-width:900px){.hero-grid{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.card-pad{padding:20px}
.h1{font-size:38px;line-height:1.05;margin:0 0 12px;font-weight:900}
.lead{color:var(--muted);font-size:16px;line-height:1.6;margin:0}
.pills{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.pill{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);padding:8px 10px;border-radius:999px;color:var(--muted);font-weight:650;background:#fff}
.pill i{width:10px;height:10px;border-radius:50%;background:var(--brand)}
.cta-row{display:flex;gap:12px;margin-top:18px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:11px 14px;border-radius:14px;border:1px solid var(--line);background:#fff;font-weight:800}
.btn.primary{background:linear-gradient(135deg, rgba(14,165,233,.95), rgba(34,197,94,.95));color:#fff;border:none}
.btn:hover{transform:translateY(-1px)}
.section{padding:10px 0 34px}
.section-title{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin:14px 0 12px}
.section-title h2{margin:0;font-size:20px}
.section-title .muted{margin:0;color:var(--muted);font-size:13px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
@media(max-width:900px){.grid-3{grid-template-columns:1fr}}
.dest{overflow:hidden;position:relative}
.dest-img{width:100%;height:190px;object-fit:cover;display:block;background:#e2e8f0}
.dest-body{padding:14px}
.dest-name{font-weight:900;margin:0 0 6px}
.dest-meta{display:flex;gap:10px;flex-wrap:wrap;color:var(--muted);font-size:13px}
.badge{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;background:rgba(14,165,233,.12);color:#0369a1;font-weight:800;font-size:12px}
.row{display:grid;grid-template-columns:1.25fr .75fr;gap:14px}
@media(max-width:900px){.row{grid-template-columns:1fr}}
.article{padding:18px 20px}
.article h2{margin:0 0 10px}
.article p{color:var(--muted);line-height:1.75}
.kv{display:grid;grid-template-columns:1fr;gap:10px;padding:18px}
.kv .item{border:1px dashed var(--line);border-radius:14px;padding:12px;background:#fff}
.kv .label{color:var(--muted);font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.06em}
.kv .value{font-weight:900;margin-top:2px}
.footer{border-top:1px solid var(--line);padding:18px 0;margin-top:26px;background:#fff}
.footer-inner{display:flex;align-items:flex-start;justify-content:space-between;gap:14px}
.footer-title{font-weight:900}
.muted{color:var(--muted)}
/* Destination detail */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
@media(max-width:900px){.gallery{grid-template-columns:1fr 1fr}}
.gallery img{width:100%;height:170px;object-fit:cover;border-radius:16px;border:1px solid var(--line);background:#e2e8f0}
.detail-head{display:flex;gap:12px;align-items:flex-start;justify-content:space-between;flex-wrap:wrap}
.detail-head h1{margin:0;font-size:28px}
.detail-sub{color:var(--muted);margin:6px 0 0}
.hr{height:1px;background:var(--line);margin:14px 0}
/* Forms */
.input, textarea{width:100%;padding:11px 12px;border-radius:14px;border:1px solid var(--line);outline:none;font:inherit;background:#fff}
textarea{min-height:120px;resize:vertical}
.input:focus, textarea:focus{border-color:rgba(14,165,233,.55);box-shadow:0 0 0 4px rgba(14,165,233,.12)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:900px){.form-row{grid-template-columns:1fr}}
.alert{border:1px solid var(--line);border-radius:16px;padding:12px 14px;margin:10px 0;background:#fff}
.alert.success{border-color:rgba(34,197,94,.35);background:rgba(34,197,94,.06)}
.alert.error{border-color:rgba(239,68,68,.35);background:rgba(239,68,68,.06)}
/* AI Chat */
.ai-chat{position:fixed;right:18px;bottom:18px;z-index:60}
.ai-toggle{border:none;border-radius:999px;background:var(--text);color:#fff;padding:12px 14px;font-weight:900;box-shadow:var(--shadow);cursor:pointer;display:flex;gap:10px;align-items:center}
.ai-dot{width:10px;height:10px;border-radius:50%;background:conic-gradient(from 180deg,var(--brand),var(--brand2))}
.ai-panel{position:absolute;right:0;bottom:56px;width:340px;max-width:calc(100vw - 36px);background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);overflow:hidden;display:none}
.ai-panel.open{display:block}
.ai-header{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 14px;border-bottom:1px solid var(--line);background:linear-gradient(180deg, rgba(14,165,233,.08), rgba(34,197,94,.04))}
.ai-title{font-weight:900}
.ai-sub{font-size:12px;color:var(--muted);margin-top:2px}
.ai-close{border:none;background:transparent;font-size:18px;cursor:pointer;color:var(--muted)}
.ai-messages{height:320px;overflow:auto;padding:12px;display:flex;flex-direction:column;gap:10px}
.msg{max-width:90%;padding:10px 12px;border-radius:16px;border:1px solid var(--line);background:#fff;line-height:1.5}
.msg.user{align-self:flex-end;background:rgba(14,165,233,.08);border-color:rgba(14,165,233,.25)}
.msg.bot{align-self:flex-start}
.ai-form{display:flex;gap:10px;padding:12px;border-top:1px solid var(--line)}
.ai-input{flex:1;border-radius:14px;border:1px solid var(--line);padding:10px 12px;outline:none}
.ai-send{border:none;border-radius:14px;background:var(--text);color:#fff;padding:10px 12px;font-weight:900;cursor:pointer}
.ai-hint{padding:0 12px 12px;color:var(--muted);font-size:12px}