/* Xinghai Packaging — English site
   静态站，无依赖。配色：墨 + 纸 + 深青 */

:root{
  --ink:#14181c;
  --ink-2:#39424b;
  --muted:#6b7580;
  --line:#e4e7e9;
  --paper:#ffffff;
  --sand:#faf8f4;
  --sand-2:#f3efe8;
  --accent:#0f766e;
  --accent-dark:#0b5a54;
  --accent-soft:#e6f4f2;
  --warn:#b45309;
  --radius:14px;
  --wrap:1120px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  color:var(--ink);
  background:var(--paper);
  line-height:1.65;
  font-size:16px;
}
img{max-width:100%;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 22px}

/* ---------- header ---------- */
.site-head{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.94);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--line);
}
.site-head .wrap{
  display:flex;align-items:center;gap:26px;
  height:66px;
}
.brand{
  font-weight:800;letter-spacing:-.02em;font-size:19px;color:var(--ink);
  display:flex;align-items:center;gap:9px;white-space:nowrap;
}
.brand .dot{
  width:11px;height:11px;border-radius:3px;
  background:var(--accent);display:inline-block;transform:rotate(45deg);
}
.nav{display:flex;gap:24px;margin-left:auto;font-size:15px}
.nav a{color:var(--ink-2);padding:6px 0;border-bottom:2px solid transparent}
.nav a:hover,.nav a.on{color:var(--accent);border-bottom-color:var(--accent);text-decoration:none}

/* ---------- hero ---------- */
.hero{padding:76px 0 56px;background:linear-gradient(180deg,var(--sand) 0%,#fff 100%)}
.hero h1{
  font-size:clamp(30px,4.2vw,50px);line-height:1.14;letter-spacing:-.025em;
  margin:0 0 20px;max-width:19em;font-weight:800;
}
.hero p.lead{font-size:clamp(16px,1.5vw,19px);color:var(--ink-2);max-width:44em;margin:0 0 28px}
.eyebrow{
  display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:.14em;
  text-transform:uppercase;color:var(--accent);margin-bottom:16px;
}
.btn{
  display:inline-block;background:var(--accent);color:#fff;font-weight:700;
  padding:13px 26px;border-radius:999px;border:0;cursor:pointer;font-size:15.5px;
  transition:.15s;
}
.btn:hover{background:var(--accent-dark);text-decoration:none}
.btn.ghost{background:transparent;color:var(--accent);border:1.5px solid var(--accent)}
.btn.ghost:hover{background:var(--accent-soft)}

/* ---------- calculator ---------- */
.calc{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:0 18px 50px -28px rgba(20,24,28,.32);
  overflow:hidden;margin:-26px 0 0;
}
.calc-head{
  padding:18px 24px;border-bottom:1px solid var(--line);
  display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;
  background:var(--sand-2);
}
.calc-head h2{margin:0;font-size:18px;letter-spacing:-.01em}
.calc-head span{font-size:13px;color:var(--muted)}
.calc-body{padding:22px 24px 26px}

.field{margin-bottom:18px}
.field > label{display:block;font-size:13px;font-weight:700;color:var(--ink-2);margin-bottom:7px;letter-spacing:.01em}
.hint{font-weight:400;color:var(--muted);font-size:12.5px}

.dims{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:8px;align-items:center}
.dims .d{position:relative;min-width:0}
.dims input{
  width:100%;padding:11px 34px 11px 11px;border:1.5px solid var(--line);
  border-radius:10px;font-size:16px;font-family:inherit;background:#fff;
}
.dims .d::after{
  content:attr(data-u);position:absolute;right:9px;top:50%;transform:translateY(-50%);
  font-size:11.5px;color:var(--muted);pointer-events:none;
}
.dims .x{color:var(--muted);font-size:13px}
input:focus,select:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}

select{
  width:100%;padding:11px 13px;border:1.5px solid var(--line);border-radius:10px;
  font-size:15px;font-family:inherit;background:#fff;appearance:none;
  background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);
  background-position:calc(100% - 18px) 21px,calc(100% - 13px) 21px;
  background-size:5px 5px,5px 5px;background-repeat:no-repeat;
}

.chips{display:flex;flex-wrap:wrap;gap:9px}
.chip{
  border:1.5px solid var(--line);border-radius:999px;padding:9px 16px;font-size:14px;
  cursor:pointer;user-select:none;transition:.12s;background:#fff;color:var(--ink-2);
}
.chip:hover{border-color:#c9d0d4}
.chip.on{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}

.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px}

.go{
  width:100%;margin-top:8px;padding:15px;font-size:16.5px;font-weight:800;
  background:var(--accent);color:#fff;border:0;border-radius:12px;cursor:pointer;
}
.go:disabled{opacity:.55;cursor:progress}

/* result */
.result{margin-top:22px;border-top:1px dashed var(--line);padding-top:20px;display:none}
.result.on{display:block}
.price-line{display:flex;align-items:flex-end;gap:12px;flex-wrap:wrap}
.price-big{font-size:44px;font-weight:800;letter-spacing:-.03em;line-height:1}
.price-big small{font-size:16px;font-weight:600;color:var(--muted);letter-spacing:0}
.price-sub{color:var(--muted);font-size:14px}
.kv{display:grid;grid-template-columns:repeat(auto-fit,minmax(148px,1fr));gap:12px;margin-top:18px}
.kv div{background:var(--sand);border-radius:10px;padding:11px 13px}
.kv b{display:block;font-size:11.5px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:700;margin-bottom:3px}
.kv span{font-size:14.5px;color:var(--ink)}
.tiers{margin-top:18px;width:100%;border-collapse:collapse;font-size:14.5px}
.tiers th,.tiers td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line)}
.tiers th{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.tiers td:last-child,.tiers th:last-child{text-align:right}
.tiers tr.on td{background:var(--accent-soft);font-weight:700}
.fine{font-size:12.5px;color:var(--muted);margin-top:14px;line-height:1.7}
.err{color:#b91c1c;font-size:14px;margin-top:12px;display:none}
.err.on{display:block}

/* ---------- sections ---------- */
section.block{padding:64px 0}
section.alt{background:var(--sand)}
h2.sec{
  font-size:clamp(24px,2.6vw,33px);letter-spacing:-.02em;line-height:1.2;
  margin:0 0 10px;font-weight:800;max-width:22em;
}
p.sec-sub{color:var(--ink-2);max-width:46em;margin:0 0 34px}

.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(258px,1fr));gap:20px}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;transition:.15s;
}
.card:hover{box-shadow:0 16px 40px -26px rgba(20,24,28,.35);transform:translateY(-2px)}
.card img{border-radius:9px;margin-bottom:16px;background:var(--sand-2);aspect-ratio:16/10;object-fit:cover;width:100%}
.card h3{margin:0 0 7px;font-size:18px;letter-spacing:-.01em}
.card p{margin:0;color:var(--ink-2);font-size:14.5px}

.points{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:22px}
.point{border-left:3px solid var(--accent);padding:2px 0 2px 16px}
.point b{display:block;margin-bottom:3px;font-size:16px}
.point span{color:var(--ink-2);font-size:14.5px}

/* cases */
.cases{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px;margin-top:26px}
.case{position:relative;border-radius:12px;overflow:hidden;background:var(--sand-2);border:1px solid var(--line)}
.case img{width:100%;aspect-ratio:4/5;object-fit:cover;display:block;transition:transform .35s}
.case:hover img{transform:scale(1.03)}
.case figcaption{
  position:absolute;left:0;right:0;bottom:0;padding:30px 14px 11px;
  font-size:12.5px;color:#fff;font-weight:600;
  text-shadow:0 1px 3px rgba(0,0,0,.55);
  background:linear-gradient(to top,rgba(10,14,18,.80),rgba(10,14,18,0));
}
.cases-note{font-size:12.5px;color:var(--muted);margin-top:16px;line-height:1.7}

/* steps */
.steps{counter-reset:s;display:grid;gap:0;border-top:1px solid var(--line)}
.step{
  counter-increment:s;display:grid;grid-template-columns:60px 1fr;gap:18px;
  padding:20px 0;border-bottom:1px solid var(--line);
}
.step::before{
  content:counter(s,decimal-leading-zero);font-weight:800;color:var(--accent);
  font-size:15px;letter-spacing:.06em;padding-top:2px;
}
.step h3{margin:0 0 5px;font-size:17px}
.step p{margin:0;color:var(--ink-2);font-size:14.5px}

table.spec{width:100%;border-collapse:collapse;font-size:15px;margin:0 0 8px}
table.spec th,table.spec td{text-align:left;padding:11px 12px;border-bottom:1px solid var(--line);vertical-align:top}
table.spec th{width:34%;color:var(--muted);font-weight:600;font-size:13.5px}

.tag-row{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 18px}
.tag{background:var(--accent-soft);color:var(--accent-dark);border-radius:999px;padding:5px 13px;font-size:13px;font-weight:600}

/* contact */
.contact-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:start}
form.q p{margin:0 0 14px}
form.q label{display:block;font-size:13px;font-weight:700;margin-bottom:6px;color:var(--ink-2)}
form.q input,form.q textarea,form.q select{
  width:100%;padding:11px 13px;border:1.5px solid var(--line);border-radius:10px;
  font-family:inherit;font-size:15px;background:#fff;
}
form.q textarea{min-height:104px;resize:vertical}

/* footer */
footer{background:var(--ink);color:#c6ccd2;padding:52px 0 30px;font-size:14px}
footer a{color:#e8ecef}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:34px;margin-bottom:34px}
footer h4{color:#fff;font-size:13px;text-transform:uppercase;letter-spacing:.1em;margin:0 0 12px}
footer ul{list-style:none;margin:0;padding:0;line-height:2}
footer .legal{border-top:1px solid #2a3238;padding-top:20px;font-size:12.5px;color:#8b959d;line-height:1.75}

@media (max-width:820px){
  .nav{display:none}
  .grid2,.contact-grid{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
  .hero{padding:52px 0 40px}
  .step{grid-template-columns:44px 1fr;gap:12px}
}

/* 窄屏：去掉输入框里的 mm 尾巴，腾出位置给数字（标题已写 millimetres） */
@media (max-width:560px){
  .dims .d::after{display:none}
  .dims input{padding-right:10px;padding-left:10px;font-size:15.5px}
  .dims{gap:6px}
}