:root {
  --brand: #1F4E5F;
  --brand-2: #2F7A8F;
  --ink: #17222A;
  --ink-2: #4A5560;
  --line: #DCE3E8;
  --bg: #F4F7F9;
  --card: #FFFFFF;
  --ok: #1E7B4F;
  --warn: #B4741C;
  --err: #B4231C;
  --radius: 14px;
}

/* hidden 属性优先级最高：任何 display 声明都不能把它“复活” */
[hidden] { display: none !important; }

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-text-size-adjust: 100%;
}

.hero {
  background: linear-gradient(160deg, var(--brand) 0%, var(--brand-2) 100%);
  color: #fff;
  padding: calc(22px + env(safe-area-inset-top)) 20px 26px;
  border-radius: 0 0 22px 22px;
}
.hero-brand { font-size: 13px; letter-spacing: .14em; opacity: .82; }
.hero h1 { margin: 6px 0 4px; font-size: 21px; font-weight: 650; letter-spacing: .01em; }
.hero p { margin: 0; font-size: 13px; opacity: .86; }

main { padding: 16px 16px calc(28px + env(safe-area-inset-bottom)); max-width: 620px; margin: 0 auto; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 16px 20px;
  box-shadow: 0 8px 24px rgba(31, 78, 95, .06);
}
.card.center { text-align: center; padding: 34px 20px; }

.field { margin-bottom: 18px; }
.field > label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px; color: var(--ink); }
.req { color: var(--err); font-weight: 600; }

input[type="text"], input[type="tel"], input[type="email"], textarea {
  width: 100%;
  padding: 12px 13px;
  font-size: 16px; /* iOS 小于 16px 会自动放大页面 */
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  outline: none;
  transition: border-color .15s ease, box-shadow .15s ease;
}
input:focus, textarea:focus {
  border-color: var(--brand-2);
  box-shadow: 0 0 0 3px rgba(47, 122, 143, .12);
}
textarea { resize: vertical; min-height: 84px; }

.hint { margin: 6px 0 0; font-size: 12px; color: var(--ink-2); min-height: 0; }
.hint.ok { color: var(--ok); }
.hint.warn { color: var(--err); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  appearance: none;
  padding: 9px 15px;
  font-size: 14px;
  color: var(--ink-2);
  background: #F7FAFB;
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: all .15s ease;
}
.chip:active { transform: scale(.97); }
.chip.is-selected {
  color: #fff;
  background: var(--brand);
  border-color: var(--brand);
}
.custom-box { margin-top: 10px; }

.error {
  margin: 0 0 14px;
  padding: 10px 12px;
  font-size: 13px;
  color: var(--err);
  background: #FDF0EF;
  border: 1px solid #F5C9C5;
  border-radius: 10px;
}

.btn-primary {
  width: 100%;
  padding: 14px;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  background: var(--brand);
  border: none;
  border-radius: 12px;
  transition: opacity .15s ease, transform .1s ease;
}
.btn-primary:active { transform: scale(.99); opacity: .92; }
.btn-primary[disabled] { opacity: .55; }

.btn-ghost {
  margin-top: 14px;
  padding: 11px 20px;
  font-size: 14px;
  color: var(--brand);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 10px;
}

.privacy { margin: 12px 0 0; font-size: 12px; color: var(--ink-2); text-align: center; }

.tick {
  width: 54px; height: 54px; margin: 0 auto 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 26px; color: #fff;
  background: var(--ok); border-radius: 50%;
}
.tick.warn { background: var(--warn); }
h2 { margin: 0 0 6px; font-size: 18px; }
.muted { margin: 0; font-size: 14px; color: var(--ink-2); }

.foot {
  padding: 0 16px 22px;
  text-align: center;
  font-size: 12px;
  color: var(--ink-2);
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #E4E7E9;
    --ink-2: #9EB0BA;
    --line: #2A3B45;
    --bg: #0E161B;
    --card: #15212A;
  }
  .chip { background: #1B2A33; }
  .error { background: #2A1614; border-color: #5A2A24; }
  .hero { background: linear-gradient(160deg, #17323C 0%, #1D4553 100%); }
}