:root {
  --coral: #FF5B49;
  --teal: #13B0A4;
  --blue: #3B6FF0;
  --yellow: #FFC53D;
  --violet: #7A5CF0;
  --pink: #EF4E9B;
  --ink: #1A140C;
  --cream: #F7EFDD;
  --card: #FFFDF6;
  --backdrop: #E7DECB;
  --ink2: #8B8270;
  --shadow: 6px 6px 0 var(--ink);
  --shadow-sm: 4px 4px 0 var(--ink);
  --radius: 20px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: "Space Grotesk", system-ui, -apple-system, sans-serif;
  background: var(--cream);
  color: var(--ink);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, .display {
  font-family: "Syne", "Space Grotesk", system-ui, sans-serif;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.02;
}

a { color: inherit; }

.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 22px; }

/* language visibility */
body[data-lang="en"] .zh { display: none !important; }
body[data-lang="zh"] .en { display: none !important; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--cream);
  border-bottom: 3px solid var(--ink);
}
.site-header .wrap {
  display: flex; align-items: center; gap: 18px;
  height: 68px;
}
.brand { display: flex; align-items: center; gap: 10px; font-family: "Syne", sans-serif; font-weight: 800; font-size: 22px; text-decoration: none; }
.brand .mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: var(--coral); border: 2.5px solid var(--ink);
  display: grid; place-items: center; color: var(--cream);
  font-size: 19px; box-shadow: 3px 3px 0 var(--ink);
}
.nav { display: flex; gap: 22px; margin-left: auto; align-items: center; }
.nav a { text-decoration: none; font-weight: 600; font-size: 15px; opacity: .85; }
.nav a:hover { opacity: 1; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 15px; text-decoration: none;
  padding: 11px 18px; border-radius: 13px;
  border: 2.5px solid var(--ink); background: var(--card); color: var(--ink);
  box-shadow: var(--shadow-sm); cursor: pointer;
  transition: transform .08s ease, box-shadow .08s ease;
}
.btn:hover { transform: translate(-1px,-1px); box-shadow: 5px 5px 0 var(--ink); }
.btn:active { transform: translate(2px,2px); box-shadow: 2px 2px 0 var(--ink); }
.btn-coral { background: var(--coral); color: var(--cream); }
.btn-ink { background: var(--ink); color: var(--cream); }

.lang-toggle {
  font-family: "Space Grotesk", sans-serif; font-weight: 700; font-size: 14px;
  padding: 8px 13px; border-radius: 11px; border: 2.5px solid var(--ink);
  background: var(--yellow); color: var(--ink); cursor: pointer;
  box-shadow: 3px 3px 0 var(--ink);
}
.lang-toggle:active { transform: translate(2px,2px); box-shadow: 1px 1px 0 var(--ink); }

/* ---------- hero ---------- */
.hero { position: relative; padding: 72px 0 84px; }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: center; }
.eyebrow {
  display: inline-block; font-weight: 700; font-size: 13px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--coral); margin-bottom: 16px;
}
.hero h1 { font-size: clamp(40px, 6vw, 68px); }
.hero h1 .hl {
  background: var(--ink); color: var(--cream);
  padding: 0 10px; border-radius: 8px; display: inline-block; transform: rotate(-1.2deg);
}
.hero p.lead { font-size: 19px; max-width: 30ch; margin: 22px 0 30px; color: #2c2418; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.muted-note { font-size: 13px; color: var(--ink2); margin-top: 14px; }

.phone-stage { position: relative; display: grid; place-items: center; }
.phone-stage .blob {
  position: absolute; width: 320px; height: 320px; border-radius: 50%;
  background: var(--teal); border: 3px solid var(--ink); z-index: 0;
  top: -14px; right: -10px; opacity: .9;
}
.phone-stage img {
  position: relative; z-index: 1; width: 280px; max-width: 80%;
  border-radius: 30px; border: 3px solid var(--ink);
  box-shadow: 10px 12px 0 var(--ink);
}

.deco { position: absolute; border: 3px solid var(--ink); z-index: 0; }
.deco.c1 { width: 22px; height: 22px; background: var(--yellow); border-radius: 50%; top: 90px; left: 6%; }
.deco.c2 { width: 30px; height: 30px; background: var(--pink); top: 60%; left: 46%; transform: rotate(20deg); }
.deco.c3 { width: 26px; height: 26px; background: var(--blue); border-radius: 50%; bottom: 50px; right: 8%; }

/* ---------- sections ---------- */
section { position: relative; }
.section-pad { padding: 70px 0; }
.section-head { text-align: center; margin-bottom: 46px; }
.section-head h2 { font-size: clamp(28px, 4vw, 42px); }
.section-head p { color: var(--ink2); margin-top: 12px; font-size: 17px; }

.features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.feature {
  background: var(--card); border: 3px solid var(--ink); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow);
}
.feature .chip {
  width: 50px; height: 50px; border-radius: 13px; border: 2.5px solid var(--ink);
  display: grid; place-items: center; font-size: 24px; margin-bottom: 16px;
  box-shadow: 3px 3px 0 var(--ink);
}
.feature h3 { font-size: 21px; margin-bottom: 8px; }
.feature p { color: #3a3225; font-size: 15.5px; }

.band { background: var(--ink); color: var(--cream); }
.band .section-head p { color: #c9c1ae; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.step {
  background: #2a2113; border: 3px solid var(--cream); border-radius: var(--radius);
  padding: 26px; box-shadow: 6px 6px 0 var(--coral);
}
.step .num {
  font-family: "Syne", sans-serif; font-weight: 800; font-size: 30px;
  color: var(--yellow); margin-bottom: 10px;
}
.step h3 { font-size: 20px; margin-bottom: 8px; }
.step p { color: #d8d0bd; font-size: 15px; }

.showcase { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 14px; }
.showcase img {
  width: 100%; border-radius: 22px; border: 3px solid var(--ink);
  box-shadow: var(--shadow);
}

.cta-final { text-align: center; padding: 84px 0; }
.cta-final h2 { font-size: clamp(30px, 5vw, 50px); margin-bottom: 12px; }
.cta-final p { color: var(--ink2); font-size: 18px; margin-bottom: 28px; }

/* ---------- footer ---------- */
.site-footer { border-top: 3px solid var(--ink); background: var(--backdrop); padding: 40px 0; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 18px; align-items: center; justify-content: space-between; }
.site-footer .links { display: flex; gap: 20px; flex-wrap: wrap; }
.site-footer a { text-decoration: none; font-weight: 600; opacity: .85; }
.site-footer a:hover { opacity: 1; text-decoration: underline; }
.site-footer small { color: var(--ink2); }

/* ---------- doc pages ---------- */
.doc { padding: 56px 0 80px; }
.doc-card {
  background: var(--card); border: 3px solid var(--ink); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 44px clamp(24px, 5vw, 60px); max-width: 820px; margin: 0 auto;
}
.doc h1 { font-size: clamp(30px, 5vw, 44px); margin-bottom: 6px; }
.doc .updated { color: var(--ink2); font-size: 14px; margin-bottom: 30px; }
.doc h2 { font-size: 22px; margin: 30px 0 10px; }
.doc p, .doc li { font-size: 16px; color: #2c2418; margin-bottom: 12px; }
.doc ul { padding-left: 22px; margin-bottom: 12px; }
.doc a { color: var(--blue); font-weight: 600; }
.doc .back { display: inline-block; margin-bottom: 24px; font-weight: 700; text-decoration: none; }

@media (max-width: 820px) {
  .hero-grid { grid-template-columns: 1fr; }
  .phone-stage { order: -1; }
  .features, .steps, .showcase { grid-template-columns: 1fr; }
  .nav a:not(.btn) { display: none; }
  .site-header .wrap { gap: 12px; }
}