@import url('https://cdn.jsdelivr.net/npm/lxgw-wenkai-webfont@1.7.0/lxgwwenkai-bold.css');
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;700;900&family=JetBrains+Mono:wght@500;700&display=swap');

:root {
  --kraft: #eadfc8;
  --kraft-d: #cdb98f;
  --paper: #fbf7ee;
  --ink: #1d2427;
  --muted: #5b625f;
  --sea: #17696f;
  --sea-l: #d3e8e4;
  --stamp: #c8412b;
  --tape: #f1bf45;
  --leaf: #3f7d33;
  --r: 14px;
  --shadow: 0 2px 0 rgba(0,0,0,.06), 0 16px 32px -14px rgba(70,45,10,.38);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  font-size: 18px;
  line-height: 1.75;
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% 8%, rgba(255,255,255,.6), transparent 38%),
    radial-gradient(circle at 92% 85%, rgba(23,105,111,.12), transparent 42%),
    radial-gradient(rgba(90,60,20,.12) 1px, transparent 1.3px) 0 0 / 18px 18px,
    var(--kraft);
}

.display { font-family: "LXGW WenKai", "Noto Sans SC", sans-serif; font-weight: 700; letter-spacing: .02em; }
.mono { font-family: "JetBrains Mono", ui-monospace, monospace; }

/* ---------- top bar: the shipping route ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px clamp(14px, 4vw, 40px);
  background: rgba(234,223,200,.9);
  backdrop-filter: blur(6px);
  border-bottom: 2px dashed var(--kraft-d);
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 900; font-size: 15px; color: var(--ink); text-decoration: none; }
.route { display: flex; align-items: center; list-style: none; margin: 0; padding: 0; }
.route li { display: flex; align-items: center; }
.route li + li::before { content: ""; width: 14px; height: 2px; background: repeating-linear-gradient(90deg, var(--ink) 0 4px, transparent 4px 7px); }
.route a {
  display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%;
  border: 2px solid var(--ink); background: var(--paper); color: var(--ink);
  font: 700 12px "JetBrains Mono", monospace; text-decoration: none; transition: transform .2s;
}
.route a:hover { transform: scale(1.12); }
.route a.done { background: var(--sea); border-color: var(--sea); color: #fff; }
.route a.here { background: var(--stamp); border-color: var(--stamp); color: #fff; transform: scale(1.18); }
@media (max-width: 640px) {
  .brand span { display: none; }
  .route li + li::before { width: 5px; }
  .route a { width: 26px; height: 26px; font-size: 11px; }
}

/* ---------- layout ---------- */
main { max-width: 1080px; margin: 0 auto; padding: clamp(24px, 5vw, 60px) clamp(16px, 4vw, 32px) 40px; }
section { margin: 0 0 76px; }
.hero { display: grid; grid-template-columns: 1.15fr 1fr; gap: clamp(24px, 4vw, 52px); align-items: center; margin-bottom: 64px; }
@media (max-width: 780px) { .hero { grid-template-columns: 1fr; } }

.kicker {
  display: inline-block; padding: 2px 10px; border: 2px solid var(--stamp); border-radius: 4px;
  color: var(--stamp); font: 700 13px "JetBrains Mono", monospace; letter-spacing: .12em; transform: rotate(-2deg);
}
h1 { font-size: clamp(40px, 6.6vw, 74px); line-height: 1.1; margin: .3em 0 .3em; }
h1 em, h2 em { font-style: normal; color: var(--sea); background: linear-gradient(transparent 62%, rgba(241,191,69,.75) 62%); }
h2 { font-size: clamp(28px, 4vw, 42px); line-height: 1.2; margin: 0 0 .5em; }
h3 { font-size: 22px; line-height: 1.3; margin: .2em 0 .4em; }
.lead { font-size: clamp(18px, 2.2vw, 22px); color: var(--muted); max-width: 32em; margin: 0; }
.note { font-size: 14px; color: var(--muted); }
p { margin: .4em 0; }
b, strong { color: var(--ink); }

.grid { display: grid; gap: 20px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .g4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 780px) { .g2, .g3, .g4 { grid-template-columns: 1fr; } }

/* ---------- shipping-label card ---------- */
.label {
  position: relative; background: var(--paper); border-radius: var(--r);
  border: 1.5px solid rgba(0,0,0,.08); box-shadow: var(--shadow); padding: 22px;
}
.label.tape::before {
  content: ""; position: absolute; top: -12px; left: 50%; width: 92px; height: 24px; margin-left: -46px;
  background: rgba(241,191,69,.85); transform: rotate(-3deg); box-shadow: 0 1px 2px rgba(0,0,0,.12);
}
.label.dark { background: var(--ink); color: var(--paper); }
.label.dark b { color: var(--tape); }
.label.sea { background: var(--sea-l); }
.barcode {
  height: 30px; border-radius: 2px; opacity: .85;
  background: repeating-linear-gradient(90deg, var(--ink) 0 2px, transparent 2px 4px, var(--ink) 4px 5px, transparent 5px 8px, var(--ink) 8px 11px, transparent 11px 13px);
}
.big { font-size: clamp(64px, 10vw, 108px); line-height: 1; }
.mid { font-size: 52px; line-height: 1; }
.tag {
  display: inline-block; padding: 1px 10px; border-radius: 999px; background: var(--ink); color: var(--paper);
  font: 700 12px "JetBrains Mono", monospace; letter-spacing: .06em;
}
.tag.sea { background: var(--sea); }
.tag.red { background: var(--stamp); }
.stamp {
  display: inline-block; padding: 4px 14px; border: 3px double var(--stamp); border-radius: 8px;
  color: var(--stamp); font-family: "LXGW WenKai", sans-serif; font-weight: 700; font-size: 24px;
  transform: rotate(-8deg); mix-blend-mode: multiply;
}
.stamp.pop { animation: stamp .5s cubic-bezier(.3,1.6,.5,1) both; animation-delay: .9s; }
@keyframes stamp { from { opacity: 0; transform: rotate(-8deg) scale(2.2); } to { opacity: .95; transform: rotate(-8deg) scale(1); } }

.takeaway {
  position: relative; overflow: hidden; border-radius: var(--r); padding: 26px 30px; background: var(--sea); color: #fff;
  font-size: clamp(20px, 2.6vw, 27px); font-weight: 700; line-height: 1.5; box-shadow: var(--shadow);
}
.takeaway small { display: block; font: 700 12px "JetBrains Mono", monospace; letter-spacing: .14em; opacity: .75; margin-bottom: 4px; }
.takeaway::after { content: "✈"; position: absolute; right: 20px; bottom: -18px; font-size: 100px; opacity: .14; }

/* ---------- controls ---------- */
.toggle { display: inline-flex; flex-wrap: wrap; gap: 4px; padding: 5px; border-radius: 999px; background: var(--paper); box-shadow: var(--shadow); }
.toggle button, .btn {
  border: 0; cursor: pointer; border-radius: 999px; padding: 10px 20px;
  font: 700 16px "Noto Sans SC", sans-serif; color: var(--muted); background: transparent;
}
.toggle button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.btn { background: var(--ink); color: var(--paper); box-shadow: var(--shadow); transition: transform .15s; }
.btn:hover { transform: translateY(-2px); }
.btn.ghost { background: var(--paper); color: var(--ink); }
a:focus-visible, button:focus-visible { outline: 3px solid var(--tape); outline-offset: 2px; }

/* ---------- step lists ---------- */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.steps li {
  display: grid; grid-template-columns: 44px 1fr; gap: 12px; align-items: center;
  padding: 12px 16px; border-radius: 12px; background: var(--paper); border: 1.5px solid rgba(0,0,0,.07);
}
.steps .who { font-size: 28px; text-align: center; }
.steps li.you { border-left: 6px solid var(--stamp); }
.steps li.ai { border-left: 6px solid var(--sea); }

/* ---------- prev / next ---------- */
.pager { display: flex; gap: 16px; margin-top: 48px; padding-top: 24px; border-top: 2px dashed var(--kraft-d); }
.pager a {
  flex: 1; padding: 16px 20px; border-radius: var(--r); background: var(--paper); color: var(--ink);
  text-decoration: none; box-shadow: var(--shadow); transition: transform .2s; font-weight: 700;
}
.pager a:hover { transform: translateY(-3px); }
.pager a.next { text-align: right; background: var(--ink); color: var(--paper); }
.pager small { display: block; font: 700 12px "JetBrains Mono", monospace; letter-spacing: .12em; opacity: .7; }
footer { text-align: center; padding: 10px 16px 40px; font-size: 13px; color: var(--muted); }

/* ---------- motion ---------- */
.reveal { opacity: 0; transform: translateY(18px); animation: up .7s cubic-bezier(.2,.7,.2,1) forwards; animation-delay: calc(var(--d, 0) * 110ms); }
@keyframes up { to { opacity: 1; transform: none; } }
.js .io { opacity: 0; transform: translateY(26px); transition: opacity .7s, transform .7s cubic-bezier(.2,.7,.2,1); transition-delay: calc(var(--d, 0) * 90ms); }
.js .io.in { opacity: 1; transform: none; }
.float { animation: float 4s ease-in-out infinite; }
@keyframes float { 50% { transform: translateY(-8px); } }

@media (prefers-reduced-motion: reduce) {
  .reveal, .stamp.pop, .float { animation: none; opacity: 1; transform: none; }
  .js .io { opacity: 1; transform: none; transition: none; }
  .stamp.pop { transform: rotate(-8deg); }
}