:root{
  --brand:#366AFF;
  --brand-deep:#2B54CC;
  --brand-dark:#1B3A8F;
  --brand-soft:#EEF3FF;
  --brand-line:#DCE6FF;
  --ink:#17223B;
  --ink-2:#4A5670;
  --ink-3:#8A94AB;
  --line:#E9EDF5;
  --bg:#F4F6FB;
  --danger:#E2483D;
  --ok:#12996B;
  --radius:16px;
  --shadow:0 8px 28px rgba(27,58,143,.07);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased;
}
button,input,select,textarea{font-family:inherit;font-size:inherit;color:inherit}
button{cursor:pointer;border:0;background:none}
img{display:block;max-width:100%}
[hidden]{display:none!important}

.page{min-height:100vh;padding-bottom:env(safe-area-inset-bottom)}

/* Hero */
.hero{position:relative;overflow:hidden;background:linear-gradient(135deg,#2546B4 0%,#2B54CC 45%,#3B70FF 100%);color:#fff;padding:26px 0 74px}
.hero__decor{position:absolute;border:1px solid rgba(255,255,255,.14);border-radius:50%;pointer-events:none}
.hero__decor--a{width:260px;height:260px;right:-92px;top:-104px}
.hero__decor--b{width:180px;height:180px;right:34px;top:64px;border-color:rgba(255,255,255,.09)}
.hero__inner{position:relative;max-width:560px;margin:0 auto;padding:0 20px}
.hero__brand{display:flex;align-items:center;justify-content:space-between;gap:12px}
.hero__logo{width:132px;height:auto}
.hero__tag{font-size:11px;letter-spacing:.08em;padding:5px 11px;border:1px solid rgba(255,255,255,.4);border-radius:20px;white-space:nowrap;color:rgba(255,255,255,.94)}
.hero__title{font-size:25px;font-weight:600;letter-spacing:.02em;margin:26px 0 6px}
.hero__desc{margin:0;font-size:13px;color:rgba(255,255,255,.8);line-height:1.7}
.hero__steps{display:flex;gap:6px;margin-top:22px}
.hero__steps span{display:flex;align-items:center;gap:5px;font-size:11px;color:rgba(255,255,255,.68);white-space:nowrap;flex:1}
.hero__steps span.is-active{color:#fff}
.hero__steps i{display:inline-flex;align-items:center;justify-content:center;width:17px;height:17px;border-radius:50%;border:1px solid rgba(255,255,255,.45);font-size:10px;font-style:normal;flex:none}
.hero__steps span.is-active i{background:#fff;color:var(--brand-deep);border-color:#fff}

/* Layout */
.main{max-width:560px;margin:-52px auto 0;padding:0 16px;position:relative;z-index:2}
.notice{display:flex;gap:10px;align-items:flex-start;background:#fff;border-radius:12px;padding:13px 15px;box-shadow:var(--shadow);border-left:3px solid var(--brand);margin-bottom:14px}
.notice svg{width:18px;height:18px;color:var(--brand);flex:none;margin-top:2px}
.notice p{margin:0;font-size:12.5px;color:var(--ink-2);line-height:1.7}

.card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:14px;overflow:hidden}
.card__head{display:flex;align-items:center;gap:12px;padding:18px 18px 14px;border-bottom:1px solid var(--line)}
.card__num{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:9px;background:var(--brand-soft);color:var(--brand-deep);font-size:13px;font-weight:600;letter-spacing:.02em;flex:none}
.card__head h2{font-size:16px;font-weight:600;margin:0;line-height:1.35}
.card__head p{font-size:11.5px;color:var(--ink-3);margin:2px 0 0}
.card__body{padding:6px 18px 20px}

/* Fields */
.field{margin-top:16px;min-width:0}
.field>label{display:block;font-size:13px;font-weight:500;color:var(--ink);margin-bottom:8px}
.field em{font-style:normal;color:var(--danger);margin-left:2px}
.field input[type=text],.field input[type=tel],.field input[type=number],.field textarea,.field select{
  width:100%;background:#F7F9FD;border:1px solid transparent;border-radius:10px;
  padding:0 13px;height:46px;outline:none;transition:border-color .18s,background .18s,box-shadow .18s;
  font-size:14.5px;color:var(--ink);
}
.field textarea{height:auto;min-height:86px;padding:11px 13px;resize:vertical;line-height:1.65}
.field input::placeholder,.field textarea::placeholder{color:#AAB3C5}
.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px rgba(54,106,255,.1)}
.field input.is-error,.field textarea.is-error,.field select.is-error{border-color:var(--danger);background:#FFF8F7}
.field__err{display:none;margin:6px 0 0;font-size:12px;color:var(--danger);line-height:1.5}
.field__err.is-show{display:block}
.field__help{margin:7px 0 0;font-size:12px;color:var(--ok)}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.select-wrap{position:relative}
.select-wrap::after{content:"";position:absolute;right:14px;top:50%;width:7px;height:7px;border-right:1.6px solid var(--ink-3);border-bottom:1.6px solid var(--ink-3);transform:translateY(-70%) rotate(45deg);pointer-events:none}
.field select{appearance:none;-webkit-appearance:none;padding-right:32px;cursor:pointer}
.field select:invalid,.field select option[value=""]{color:#AAB3C5}

.segment{display:flex;gap:10px}
.segment button{flex:1;height:44px;border-radius:10px;background:#F7F9FD;border:1px solid transparent;color:var(--ink-2);font-size:14px;transition:.18s}
.segment button:hover{border-color:var(--brand-line)}
.segment button.is-active{background:var(--brand-soft);border-color:var(--brand);color:var(--brand-deep);font-weight:600}

.branch{border-top:1px dashed var(--line);margin-top:20px;padding-top:4px}
.branch__hint{background:var(--brand-soft);color:var(--brand-deep);font-size:12px;padding:9px 12px;border-radius:8px;margin:16px 0 0;line-height:1.6}
.tip{font-size:12px;color:var(--ink-3);line-height:1.75;background:#F7F9FD;border-radius:8px;padding:9px 11px;margin:0 0 10px}
.tip--warn{color:#9A6B12;background:#FFF8E8;margin:16px 0 0}
.tip--strong{color:#A8621A;background:#FFF6EA;margin-bottom:10px}

.subjects{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.subject{display:flex;align-items:center;gap:8px;background:#F7F9FD;border-radius:9px;padding:6px 9px}
.subject span{font-size:12.5px;color:var(--ink-2);flex:1;white-space:nowrap}
.subject input{width:76px;height:34px;border:1px solid transparent;background:#fff;border-radius:7px;padding:0 8px;font-size:13.5px;text-align:right;outline:none}
.subject input:focus{border-color:var(--brand)}
.subject input::placeholder{color:#C0C7D6}

/* Uploader */
.uploader{border:1.5px dashed var(--brand-line);border-radius:12px;background:#FAFCFF;transition:.18s;overflow:hidden}
.uploader:hover,.uploader.is-over{border-color:var(--brand);background:var(--brand-soft)}
.uploader__empty{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;padding:26px 14px;text-align:center;cursor:pointer}
.uploader__empty svg{width:28px;height:28px;color:var(--brand);margin-bottom:4px}
.uploader__empty strong{font-size:13px;font-weight:500;color:var(--ink-2)}
.uploader__empty span{font-size:11.5px;color:var(--ink-3)}
.uploader__preview{padding:12px;text-align:center}
.uploader__preview img{max-height:220px;margin:0 auto;border-radius:8px;box-shadow:0 2px 10px rgba(27,58,143,.1)}
.uploader__remove{margin-top:10px;font-size:12px;color:var(--danger);border:1px solid #F6C9C5;border-radius:7px;padding:5px 14px;background:#fff}
.uploader__empty.is-loading{opacity:.6;pointer-events:none}

/* Code + submit */
.code-row{display:flex;gap:10px}
.code-row input{flex:1;min-width:0}
.btn-code{width:118px;flex:none;height:46px;border-radius:10px;background:var(--brand-soft);color:var(--brand-deep);font-size:13px;font-weight:500;border:1px solid var(--brand-line);transition:.18s}
.btn-code:not(:disabled):hover{background:#E3ECFF}
.btn-code:disabled{color:var(--ink-3);background:#F2F4F8;border-color:var(--line);cursor:not-allowed}
.btn-submit{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;height:50px;margin-top:22px;border-radius:12px;background:var(--brand);color:#fff;font-size:15.5px;font-weight:600;letter-spacing:.03em;box-shadow:0 6px 18px rgba(54,106,255,.28);transition:.18s}
.btn-submit svg{width:18px;height:18px}
.btn-submit:not(:disabled):hover{background:var(--brand-deep)}
.btn-submit:disabled{opacity:.6;cursor:wait}
.submit-note{text-align:center;font-size:11.5px;color:var(--ink-3);margin:11px 0 0}

.footer{text-align:center;padding:16px 0 30px}
.footer p{margin:0;font-size:11.5px;color:#A4ADBF}

/* Toast */
.toast{position:fixed;left:50%;top:24px;transform:translate(-50%,-16px);background:rgba(23,34,59,.94);color:#fff;font-size:13px;padding:11px 18px;border-radius:10px;box-shadow:0 8px 24px rgba(0,0,0,.18);opacity:0;pointer-events:none;transition:.22s;z-index:60;max-width:88vw;text-align:center}
.toast.is-show{opacity:1;transform:translate(-50%,0)}

/* Success */
.overlay{position:fixed;inset:0;background:rgba(18,28,52,.55);display:flex;align-items:center;justify-content:center;padding:22px;z-index:50}
.success{width:100%;max-width:340px;background:#fff;border-radius:20px;padding:30px 24px 24px;text-align:center;box-shadow:0 20px 60px rgba(0,0,0,.18)}
.success__icon{width:62px;height:62px;border-radius:50%;background:#E7F7F0;color:var(--ok);display:flex;align-items:center;justify-content:center;margin:0 auto 16px}
.success__icon svg{width:30px;height:30px}
.success h2{font-size:19px;font-weight:600;margin:0 0 8px}
.success__tip{font-size:12.5px;color:var(--ink-3);margin:0 0 18px;line-height:1.7}
.success__code{background:var(--brand-soft);border-radius:12px;padding:14px;margin-bottom:16px}
.success__code span{display:block;font-size:11.5px;color:var(--ink-3);margin-bottom:4px}
.success__code strong{font-size:19px;letter-spacing:.06em;color:var(--brand-deep)}
.btn-copy{display:flex;align-items:center;justify-content:center;gap:7px;width:100%;height:44px;border-radius:10px;background:var(--brand);color:#fff;font-size:14px;font-weight:500}
.btn-copy svg{width:16px;height:16px}
.btn-text{margin-top:12px;font-size:13px;color:var(--ink-3);padding:6px 12px}

@media (max-width:380px){
  .hero__title{font-size:22px}
  .hero__steps span{font-size:10px}
  .field-row{grid-template-columns:1fr;gap:0}
  .subjects{grid-template-columns:1fr}
  .btn-code{width:104px;font-size:12px}
}