/* 行旅 · Fluent editorial travel UI */
:root{
  --bg:#F4F6F9;
  --bg-2:#EEF1F5;
  --surface:#FFFFFF;
  --ink:#0F172A;
  --ink-2:#1E293B;
  --muted:#64748B;
  --line:#E5E7EB;
  --line-2:#EEF2F6;
  --brand:#0F766E;          /* teal-700 */
  --brand-2:#14B8A6;        /* teal-500 */
  --brand-soft:#CCFBF1;
  --warn:#B45309;
  --warn-bg:#FFF7ED;
  --rose:#E11D48;
  --rose-bg:#FFF1F2;
  --r:18px;
  --r-sm:12px;
  --r-pill:999px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.05),0 1px 3px rgba(15,23,42,.04);
  --shadow:0 10px 30px rgba(15,23,42,.08),0 2px 6px rgba(15,23,42,.04);
  --shadow-lg:0 24px 60px rgba(15,23,42,.12),0 4px 12px rgba(15,23,42,.05);
  --maxw:920px;
  --maxw-narrow:640px;
  --serif:"Source Han Serif SC","Noto Serif CJK SC","Songti SC","SimSun",Georgia,"Times New Roman",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI Variable","Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --ease:cubic-bezier(.2,.7,.2,1);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-feature-settings:"ss01","cv11"}
body{min-height:100vh;overflow-x:hidden}
img{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;padding:0}
a{color:inherit;text-decoration:none}
input{font:inherit;color:inherit}

/* Ambient background */
.bg-aurora{
  position:fixed;inset:-20vmax;z-index:-1;pointer-events:none;
  background:
    radial-gradient(40vmax 30vmax at 15% -10%, rgba(20,184,166,.18), transparent 60%),
    radial-gradient(35vmax 25vmax at 95% 5%, rgba(15,118,110,.12), transparent 65%),
    radial-gradient(50vmax 40vmax at 50% 110%, rgba(245,158,11,.08), transparent 65%);
  filter:blur(0.5px);
}

/* Top bar */
.topbar{
  position:sticky;top:0;z-index:50;
  backdrop-filter:saturate(160%) blur(14px);
  -webkit-backdrop-filter:saturate(160%) blur(14px);
  background:rgba(244,246,249,.72);
  border-bottom:1px solid rgba(15,23,42,.05);
}
.topbar-inner{
  max-width:var(--maxw);margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 22px;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;letter-spacing:.5px}
.brand-mark{
  width:28px;height:28px;border-radius:8px;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  display:grid;place-items:center;color:#fff;
  box-shadow:inset 0 -2px 0 rgba(0,0,0,.08),0 4px 12px rgba(15,118,110,.25);
}
.brand-mark svg{width:16px;height:16px}
.brand-name{font-family:var(--serif);font-size:18px}
.brand-sub{font-size:12px;color:var(--muted);margin-left:2px}
.topbar-meta{font-size:12px;color:var(--muted)}

/* Layout */
.shell{max-width:var(--maxw);margin:0 auto;padding:28px 22px 80px}

/* Hero */
.hero{
  position:relative;
  border-radius:24px;overflow:hidden;
  background:
    linear-gradient(180deg, rgba(15,23,42,.0) 35%, rgba(15,23,42,.55) 100%),
    url("assets/cities/hero.jpg") center/cover no-repeat;
  box-shadow:var(--shadow);
  color:#fff;
}
.hero-inner{padding:44px 32px 32px}
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 12px;border-radius:var(--r-pill);
  background:rgba(255,255,255,.16);
  border:1px solid rgba(255,255,255,.28);
  backdrop-filter:blur(8px);
  font-size:12px;letter-spacing:1px;
}
.hero-eyebrow .dot{width:6px;height:6px;border-radius:50%;background:#5EEAD4;box-shadow:0 0 0 4px rgba(94,234,212,.18)}
.hero h1{
  font-family:var(--serif);
  font-weight:600;
  font-size:44px;line-height:1.15;letter-spacing:-.5px;
  margin:18px 0 10px;max-width:18ch;
}
.hero p{margin:0;opacity:.92;max-width:42ch;font-size:15px;line-height:1.65}

/* Input panel (floating, overlaps hero) */
.input-card{
  margin:-44px 22px 0;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r);
  box-shadow:var(--shadow-lg);
  padding:18px 18px 20px;
  display:grid;grid-template-columns:1fr auto;gap:16px;align-items:center;
}
.input-card .label{display:block;font-size:12px;color:var(--muted);margin-bottom:8px;letter-spacing:.5px}
.days-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.days-input{
  width:88px;padding:12px 14px;
  border:1px solid var(--line);border-radius:var(--r-sm);
  background:#F8FAFC;
  font-size:22px;font-weight:600;text-align:center;color:var(--ink);
  outline:none;transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.days-input:focus{border-color:var(--brand);box-shadow:0 0 0 4px rgba(15,118,110,.12);background:#fff}
.days-hint{font-size:12px;color:var(--muted)}
.btn-primary{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 20px;border-radius:var(--r-pill);
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  color:#fff;font-weight:600;font-size:15px;
  box-shadow:0 8px 20px rgba(15,118,110,.28),inset 0 -2px 0 rgba(0,0,0,.1);
  transition:transform .15s var(--ease),box-shadow .2s var(--ease),opacity .2s var(--ease);
  white-space:nowrap;
}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 26px rgba(15,118,110,.34),inset 0 -2px 0 rgba(0,0,0,.1)}
.btn-primary:active{transform:translateY(0)}
.btn-primary:disabled{opacity:.65;cursor:not-allowed;transform:none}
.btn-primary .arrow{width:16px;height:16px}

/* Mode banner */
.banner{
  margin:14px 0 0;padding:10px 14px;border-radius:var(--r-sm);
  font-size:13px;line-height:1.5;
  background:var(--warn-bg);border:1px solid #FED7AA;color:var(--warn);
  display:flex;align-items:center;gap:8px;
}

/* Tabs */
.tabs{
  display:inline-flex;padding:4px;border-radius:var(--r-pill);
  background:rgba(15,23,42,.05);margin:28px 0 16px;
}
.tab{
  padding:8px 18px;border-radius:var(--r-pill);
  font-size:14px;font-weight:500;color:var(--muted);
  transition:all .2s var(--ease);
}
.tab.active{background:#fff;color:var(--ink);box-shadow:var(--shadow-sm)}
.tab:hover:not(.active){color:var(--ink-2)}

/* Recommend results */
.summary{font-size:13px;color:var(--muted);text-align:center;margin:0 0 14px;letter-spacing:.5px}
.results{display:grid;gap:14px}
.card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:20px 22px;
  box-shadow:var(--shadow-sm);
  animation:rise .35s var(--ease) both;
}
.card h3{
  margin:0 0 12px;display:flex;align-items:center;gap:10px;
  font-size:16px;font-weight:600;
}
.card h3 .badge{
  display:inline-flex;align-items:center;justify-content:center;
  width:28px;height:28px;border-radius:8px;
  background:var(--brand-soft);color:var(--brand);
}
.card ul{margin:0;padding-left:0;list-style:none}
.card li{padding:8px 0;border-top:1px dashed var(--line-2);font-size:14px;color:var(--ink-2);display:flex;gap:10px}
.card li:first-child{border-top:0}
.card li .day{color:var(--muted);font-variant-numeric:tabular-nums;min-width:64px;font-size:12px;padding-top:3px}
.card .meta{font-size:12px;color:var(--muted);margin-top:8px}
.card .actions{display:flex;gap:8px;margin-top:12px}
.btn-ghost{
  font-size:13px;color:var(--brand);font-weight:500;
  padding:6px 12px;border-radius:var(--r-pill);
  background:var(--brand-soft);
  transition:background .15s var(--ease);
}
.btn-ghost:hover{background:#B2F5EA}

.price{display:flex;align-items:baseline;gap:6px}
.price .amt{font-family:var(--serif);font-size:28px;font-weight:600;color:var(--ink)}
.price .cur{color:var(--muted);font-size:13px}

@keyframes rise{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* Case cards */
.cases-intro{margin:22px 0 12px}
.cases-intro h2{margin:0 0 4px;font-family:var(--serif);font-size:22px;font-weight:600;letter-spacing:-.3px}
.cases-intro p{margin:0;color:var(--muted);font-size:13px}

.featured{
  position:relative;border-radius:24px;overflow:hidden;
  box-shadow:var(--shadow);
  aspect-ratio: 16/9;
  cursor:pointer;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.featured:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.featured .ph{
  position:absolute;inset:0;background-size:cover;background-position:center;
  transform:scale(1.02);transition:transform .6s var(--ease);
}
.featured:hover .ph{transform:scale(1.06)}
.featured .veil{
  position:absolute;inset:0;
  background:linear-gradient(180deg, rgba(15,23,42,0) 40%, rgba(15,23,42,.72) 100%);
}
.featured .meta{
  position:absolute;left:24px;right:24px;bottom:22px;color:#fff;
}
.featured .eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12px;opacity:.85;letter-spacing:1px}
.featured .eyebrow .pill{padding:3px 10px;border-radius:var(--r-pill);background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.28);backdrop-filter:blur(6px)}
.featured h3{margin:10px 0 6px;font-family:var(--serif);font-size:30px;font-weight:600;line-height:1.2}
.featured .price-row{display:flex;align-items:center;gap:14px;font-size:14px;opacity:.92}
.featured .price-row b{font-weight:600}

.case-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:14px;
}
.mini{
  position:relative;border-radius:var(--r);overflow:hidden;
  aspect-ratio: 4/3;
  box-shadow:var(--shadow-sm);
  cursor:pointer;
  transition:transform .25s var(--ease),box-shadow .25s var(--ease);
}
.mini:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.mini .ph{position:absolute;inset:0;background-size:cover;background-position:center;transition:transform .5s var(--ease)}
.mini:hover .ph{transform:scale(1.05)}
.mini .veil{position:absolute;inset:0;background:linear-gradient(180deg, rgba(15,23,42,0) 45%, rgba(15,23,42,.7) 100%)}
.mini .body{position:absolute;left:14px;right:14px;bottom:12px;color:#fff}
.mini .emoji{font-size:18px}
.mini .title{font-family:var(--serif);font-size:17px;font-weight:600;margin:4px 0 2px;line-height:1.25}
.mini .row{display:flex;align-items:center;gap:8px;font-size:12px;opacity:.9}
.mini .days-tag{padding:2px 8px;border-radius:var(--r-pill);background:rgba(255,255,255,.2);border:1px solid rgba(255,255,255,.3)}

/* Footer */
footer{
  margin-top:40px;text-align:center;font-size:12px;color:var(--muted);
}
footer .links{display:flex;justify-content:center;gap:10px;margin-top:6px}
footer a{color:var(--brand)}
footer a:hover{text-decoration:underline}

/* Toast */
.toast{
  position:fixed;left:50%;bottom:28px;transform:translateX(-50%) translateY(20px);
  background:rgba(15,23,42,.92);color:#fff;
  padding:10px 18px;border-radius:var(--r-pill);
  font-size:13px;opacity:0;pointer-events:none;
  box-shadow:0 10px 30px rgba(0,0,0,.25);
  transition:opacity .2s var(--ease),transform .2s var(--ease);
  z-index:60;max-width:80vw;text-align:center;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* Loading shimmer */
.shimmer{position:relative;overflow:hidden;color:transparent}
.shimmer::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(90deg, transparent, rgba(15,23,42,.06), transparent);
  animation:shim 1.2s infinite;
}
@keyframes shim{from{transform:translateX(-100%)}to{transform:translateX(100%)}}

/* Responsive */
@media (max-width: 640px){
  .hero h1{font-size:34px}
  .hero-inner{padding:36px 22px 26px}
  .input-card{margin:-36px 0 0;padding:16px}
  .input-card{grid-template-columns:1fr}
  .btn-primary{justify-content:center}
  .featured h3{font-size:24px}
  .case-grid{grid-template-columns:1fr}
  .topbar-inner{padding:12px 16px}
  .shell{padding:22px 16px 64px}
}
@media (prefers-reduced-motion: reduce){
  *{animation:none !important;transition:none !important}
}