:root{
  --green:#006a4e; --green-d:#004d38; --red:#e03a3e; --ink:#14201c; --muted:#5b6b66;
  --line:#e2e8e5; --bg:#f4f7f6; --card:#fff; --soft:#e8f3ef; --amber:#fff4d6; --amber-b:#e8c770;
  --radius:14px; --shadow:0 1px 2px rgba(0,0,0,.05),0 4px 16px rgba(0,40,28,.06);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:"Hind Siliguri",system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg);line-height:1.45;font-size:16px}
a{color:var(--green)}
p{margin:0}
.wrap{max-width:1120px;margin:0 auto;padding:0 16px}
[hidden]{display:none!important}

/* top */
.topbar{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.topbar-in{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--ink);font-size:22px;font-weight:500}
.brand b{color:var(--green);font-weight:700}
.nav{display:flex;gap:18px}
.nav a{text-decoration:none;color:var(--muted);font-weight:500}
.nav a:hover{color:var(--green)}

/* hero + search */
.hero{background:linear-gradient(160deg,var(--green) 0%,var(--green-d) 100%);color:#fff;padding:36px 0 28px}
.hero h1{font-size:clamp(26px,4.4vw,40px);line-height:1.15;margin:0 0 8px;font-weight:700;max-width:760px}
.hero .sub{opacity:.9;max-width:640px;margin-bottom:22px}
.search{background:#fff;color:var(--ink);border-radius:var(--radius);padding:14px;box-shadow:0 10px 30px rgba(0,0,0,.18)}
.trip{display:flex;gap:18px;margin-bottom:10px;font-weight:500}
.trip input{accent-color:var(--green)}
.fields{display:grid;grid-template-columns:1fr auto 1fr 1fr 1fr .7fr auto;gap:8px;align-items:end}
.fields:not(.has-return) #returnField{display:none}
.field{display:flex;flex-direction:column;min-width:0}
.field label{font-size:13px;color:var(--muted);font-weight:500;margin:0 0 3px 2px}
.field select,.field input{height:48px;border:1px solid var(--line);border-radius:10px;padding:0 10px;font:inherit;font-size:16px;background:#fff;color:var(--ink);width:100%}
.field select:focus,.field input:focus{outline:2px solid var(--green);outline-offset:-1px}
.swap{height:48px;width:40px;border:1px solid var(--line);background:var(--soft);border-radius:10px;font-size:18px;cursor:pointer;color:var(--green)}
.btn-search{height:48px;padding:0 22px;border:0;border-radius:10px;background:var(--red);color:#fff;font:inherit;font-weight:700;font-size:17px;cursor:pointer;white-space:nowrap}
.btn-search:hover{filter:brightness(.95)}
.btn-search:disabled{opacity:.7;cursor:wait}
.form-error{color:var(--red);font-size:14px;min-height:0;margin-top:6px}
.form-error:empty{display:none}
.popular{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.popular button{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.3);color:#fff;border-radius:999px;padding:6px 12px;font:inherit;font-size:14px;cursor:pointer}
.popular button:hover{background:rgba(255,255,255,.22)}

/* results */
#results{padding-top:20px;padding-bottom:20px}
.banner{border-radius:10px;padding:10px 14px;margin-bottom:14px;font-size:15px}
.banner.demo{background:var(--amber);border:1px solid var(--amber-b)}
.legs{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:12px}
.leg{border:1px solid var(--line);background:#fff;border-radius:10px;padding:10px;font:inherit;text-align:left;cursor:pointer}
.leg.active{border-color:var(--green);box-shadow:inset 0 0 0 1px var(--green);background:var(--soft)}
.leg small{display:block;color:var(--muted)}
.leg .picked{color:var(--green);font-weight:600}

.summary{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:16px}
.sum{background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px;cursor:pointer;text-align:left;font:inherit}
.sum.on{border-color:var(--green);box-shadow:inset 0 0 0 1px var(--green)}
.sum .k{font-size:13px;color:var(--muted);font-weight:500}
.sum .v{font-size:20px;font-weight:700}
.sum .s{font-size:13px;color:var(--muted)}

.layout{display:grid;grid-template-columns:240px 1fr;gap:18px;align-items:start}
.filters{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:14px;position:sticky;top:76px}
.filters-head{display:flex;justify-content:space-between;align-items:center}
.filters h2{font-size:18px;margin:0}
fieldset{border:0;border-top:1px solid var(--line);margin:12px 0 0;padding:10px 0 0}
legend{font-weight:600;padding:0;margin-bottom:6px}
fieldset label{display:flex;align-items:center;gap:8px;padding:3px 0;cursor:pointer}
fieldset label small{color:var(--muted);margin-left:auto}
fieldset input[type=checkbox]{accent-color:var(--green);width:17px;height:17px}
input[type=range]{width:100%;accent-color:var(--green)}
.link{background:none;border:0;color:var(--green);font:inherit;cursor:pointer;padding:0;text-decoration:underline}

.list-head{display:flex;align-items:center;gap:12px;margin-bottom:10px}
#count{flex:1;color:var(--muted)}
.sort{display:flex;align-items:center;gap:6px;font-size:14px;color:var(--muted)}
.sort select{height:38px;border:1px solid var(--line);border-radius:8px;font:inherit;padding:0 8px;background:#fff}
.btn-filter{display:none;height:38px;border:1px solid var(--line);background:#fff;border-radius:8px;font:inherit;padding:0 12px}

.list{display:flex;flex-direction:column;gap:10px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);display:grid;grid-template-columns:200px 1fr 190px;gap:12px;padding:14px 16px;align-items:center}
.card.sel{border-color:var(--green);box-shadow:inset 0 0 0 2px var(--green)}
.c-air{display:flex;gap:10px;align-items:center}
.logo{width:38px;height:38px;border-radius:9px;display:grid;place-items:center;color:#fff;font-weight:700;font-size:14px;flex:none;overflow:hidden;background:#888}
.logo img{width:100%;height:100%;object-fit:contain;background:#fff}
.aname{font-weight:600;line-height:1.2}
.fno{font-size:13px;color:var(--muted)}
.c-time{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;text-align:center}
.t{font-size:22px;font-weight:700;line-height:1}
.ap{font-size:13px;color:var(--muted)}
.mid .dur,.mid .stops{font-size:13px;color:var(--muted)}
.mid .stops{color:var(--green);font-weight:500}
.line{display:block;height:2px;background:var(--line);margin:4px 0;position:relative}
.line:after{content:"✈";position:absolute;right:-4px;top:-10px;font-size:13px;color:var(--green)}
.c-price{text-align:right;display:flex;flex-direction:column;align-items:flex-end;gap:2px}
.tags{display:flex;gap:4px;flex-wrap:wrap;justify-content:flex-end}
.tag{font-size:12px;font-weight:600;border-radius:6px;padding:1px 7px;background:var(--soft);color:var(--green)}
.tag.cheap{background:#ffe8e8;color:#b42318}
.price{font-size:24px;font-weight:700}
.pp{font-size:13px;color:var(--muted)}
.btn-book{margin-top:6px;display:inline-block;background:var(--green);color:#fff;text-decoration:none;border-radius:9px;padding:8px 12px;font-weight:600;font-size:15px;white-space:nowrap}
.btn-book:hover{background:var(--green-d)}
.btn-airline{display:inline-block;margin-top:4px;border:1px solid var(--green);color:var(--green);background:#fff;text-decoration:none;border-radius:9px;padding:6px 12px;font-weight:600;font-size:14px;white-space:nowrap}
.btn-airline:hover{background:var(--soft)}
.more{font-size:13px;margin-top:2px}
.details{grid-column:1/-1;border-top:1px dashed var(--line);padding-top:10px;display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:8px 16px;font-size:14px}
.details dl{margin:0}
.details dt{color:var(--muted);font-size:12px}
.details dd{margin:0;font-weight:500}

.empty,.loading{background:#fff;border:1px dashed var(--line);border-radius:var(--radius);padding:28px;text-align:center;color:var(--muted)}
.skel{height:96px;border-radius:var(--radius);background:linear-gradient(90deg,#eef2f0 25%,#f7f9f8 50%,#eef2f0 75%);background-size:200% 100%;animation:sh 1.2s infinite}
@keyframes sh{to{background-position:-200% 0}}

.how{padding:36px 16px}
.how h2{margin:0 0 12px}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;padding:0;list-style:none;counter-reset:s;margin:0 0 12px}
.steps li{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px;counter-increment:s}
.steps li:before{content:counter(s);display:inline grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--green);color:#fff;font-weight:700;margin-right:8px}
.note{color:var(--muted);font-size:14px}
.footer{border-top:1px solid var(--line);background:#fff;padding:18px 0;font-size:14px;color:var(--muted)}
.footer-in{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}

.page{max-width:760px;padding:32px 16px}
.page h1{margin-top:0}

/* tablet */
@media (max-width:960px){
  .fields{grid-template-columns:1fr auto 1fr;}
  .fields .field:nth-of-type(3),.fields #returnField,.fields .field.small{grid-column:span 1}
  .btn-search{grid-column:1/-1}
  .layout{grid-template-columns:1fr}
  .filters{position:static;display:none}
  .filters.open{display:block}
  .btn-filter{display:inline-block}
  .card{grid-template-columns:1fr auto;}
  .c-air{grid-column:1/-1}
  .c-time{grid-column:1}
  .c-price{grid-column:2}
}
/* phone */
@media (max-width:600px){
  .nav a[href="#how"]{display:none}
  .hero{padding:24px 0 20px}
  .fields{grid-template-columns:1fr auto 1fr}
  .fields .field:nth-of-type(3){grid-column:1/3}
  .fields .field.small{grid-column:3}
  .fields.has-return .field:nth-of-type(3){grid-column:1/2}
  .fields.has-return #returnField{grid-column:2/4}
  .fields.has-return .field.small{grid-column:1/-1}
  .summary{grid-template-columns:repeat(3,1fr);gap:6px}
  .sum{padding:8px}
  .sum .v{font-size:16px}
  .card{grid-template-columns:1fr;padding:12px}
  .c-time,.c-price{grid-column:1}
  .c-price{display:grid;grid-template-columns:1fr auto;align-items:center;gap:2px 10px;text-align:left;border-top:1px solid var(--line);padding-top:10px}
  .c-price .tags{grid-column:1/-1;justify-content:flex-start}
  .c-price .tags:empty{display:none}
  .c-price .price,.c-price .pp,.c-price .more{grid-column:1/-1;justify-self:start}
  .btn-book,.btn-airline{margin:4px 0 0;text-align:center;white-space:normal}
  .list-head{flex-wrap:wrap}
  #count{flex-basis:100%}
  .steps{grid-template-columns:1fr}
}
.tag.approx{background:#fff4d6;color:#8a5a00}
.price.noprice{font-size:18px;color:var(--muted)}