:root{
  --paper:#f4f1e8;
  --card:#fffdf8;
  --ink:#20302a;
  --ink2:#4b5a51;
  --muted:#8a978e;
  --green:#2f6b4e;
  --green-d:#1e4b37;
  --green-l:#e9f1ea;
  --rose:#c76d85;
  --line:#e4dfd2;
  --err:#b4472f;
  --shadow:0 30px 80px -40px rgba(24,52,38,.45);
  /* 四季底色，由 season.js 切 html[data-season] */
  --bg-a:#edf2e8;
  --bg-b:#f7e8ec;
  --bg-base:#f4f1e8;
}

html[data-season="spring"]{--bg-a:#e1f0e2;--bg-b:#eff5ea;--bg-base:#eef4ea}
html[data-season="summer"]{--bg-a:#f1f7d8;--bg-b:#fdf0cd;--bg-base:#f6f6e7}
html[data-season="autumn"]{--bg-a:#fbe7cc;--bg-b:#f7dccb;--bg-base:#f7eee0}
html[data-season="winter"]{--bg-a:#e3edf9;--bg-b:#dfe8f4;--bg-base:#e9f0f8}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);
  background:
    radial-gradient(1100px 640px at 12% 0%, var(--bg-a) 0%, transparent 58%),
    radial-gradient(900px 600px at 100% 100%, var(--bg-b) 0%, transparent 55%),
    var(--bg-base);
  -webkit-font-smoothing:antialiased;
  transition:background-color .6s;
}
/* 四季动态背景（canvas 在最底层，内容压在它上面） */
.season-bg{position:fixed;inset:0;width:100%;height:100%;z-index:0;pointer-events:none}
.auth,.home{position:relative;z-index:1}
.season-wrap{
  position:fixed;left:18px;bottom:18px;z-index:20;
  display:flex;flex-direction:column;align-items:flex-start;gap:7px;
  text-shadow:0 1px 3px rgba(255,255,255,.75);
  transition:opacity .15s;
}
/* 手机弹键盘时（有输入框聚焦）收起来，免得被顶到输入框上误触；桌面端不受影响 */
@media (hover:none) and (pointer:coarse){
  body.kb-typing .season-wrap{opacity:0;visibility:hidden;pointer-events:none}
}
.season-hint{font-size:10px;letter-spacing:1.5px;color:#a3aea4}
.season-switch{display:flex;gap:18px;padding:0}
.season-switch button{
  width:auto;height:auto;border:0;border-radius:0;background:none;padding:0 0 2px;
  color:#93a094;font-size:13px;font-weight:600;letter-spacing:2px;line-height:1.2;
  border-bottom:1px solid transparent;transition:color .15s,border-color .15s;
}
.season-switch button:hover{color:var(--green)}
.season-switch button[aria-pressed="true"]{color:var(--green-d);border-bottom-color:var(--green)}
@media(max-width:560px){
  .season-wrap{left:12px;bottom:12px;gap:6px}
  .season-switch{gap:14px}
  .season-switch button{font-size:12px;letter-spacing:1px}
  .season-hint{font-size:9.5px;letter-spacing:1px}
}
input,button{font:inherit;color:inherit}
button{cursor:pointer}
[hidden]{display:none!important}

.auth{min-height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;padding:34px 18px}

.card{
  width:min(460px,100%);
  background:var(--card);
  border:1px solid var(--line);
  border-radius:26px;
  box-shadow:var(--shadow);
  overflow:hidden;
}

/* ---------- 品牌行 ---------- */
.mark{width:34px;height:34px;color:var(--green);flex:0 0 auto}
.mark svg{width:100%;height:100%;display:block}
.name{display:flex;flex-direction:column;line-height:1.15;font-weight:700;letter-spacing:.5px;color:var(--ink)}
.name small{font-size:9px;letter-spacing:1.6px;font-weight:500;color:var(--muted);margin-top:4px}

/* ---------- 右侧表单 ---------- */
.pane{padding:34px 40px 28px;display:flex;flex-direction:column;min-width:0}
.mobile-brand{display:flex;align-items:center;gap:10px;margin-bottom:20px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.mobile-brand .name{color:var(--ink)}
.mobile-brand .name small{color:var(--muted)}
.head{margin-bottom:20px}
.head h1{margin:0;font-size:25px;letter-spacing:.5px;font-weight:700}
.head .sub{margin:8px 0 0;font-size:12.5px;color:var(--muted)}

.tabs{display:flex;gap:26px;border-bottom:1px solid var(--line);margin-bottom:22px}
.tabs button{
  background:none;border:0;padding:0 0 12px;font-size:13.5px;color:var(--muted);
  position:relative;font-weight:500;transition:color .15s;
}
.tabs button:hover{color:var(--ink2)}
.tabs button.on{color:var(--green);font-weight:600}
.tabs button.on::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--green),#5b9a74);
}

form{display:flex;flex-direction:column;gap:14px}
.field{min-width:0}
.field label{
  display:flex;align-items:baseline;gap:8px;margin-bottom:7px;
  font-size:12.5px;font-weight:600;color:var(--ink2);
}
.field label span{font-size:9px;letter-spacing:1.4px;color:#adb6ae;font-weight:500}
.wrap{position:relative;display:flex;align-items:center}
.wrap input{
  width:100%;height:45px;padding:0 14px;border-radius:11px;
  border:1px solid var(--line);background:#fbfaf4;outline:none;
  font-size:13.5px;transition:border-color .15s,box-shadow .15s,background .15s;
}
.wrap input::placeholder{color:#b3bab2}
.wrap input:focus{border-color:#8fbb9d;background:#fff;box-shadow:0 0 0 3px rgba(47,107,78,.10)}
.wrap input:disabled{opacity:.6}
.wrap.has-eye input{padding-right:52px}
.eye{
  position:absolute;right:8px;top:50%;transform:translateY(-50%);
  background:none;border:0;font-size:11.5px;color:var(--muted);padding:6px 8px;border-radius:7px;
}
.eye:hover{color:var(--green);background:var(--green-l)}

.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}

.code-row{display:grid;grid-template-columns:1fr 132px;gap:10px}
.code-btn{
  height:45px;border-radius:11px;border:1px solid #cfe0d5;background:var(--green-l);
  color:var(--green);font-size:12.5px;font-weight:600;transition:.15s;white-space:nowrap;
}
.code-btn:hover:not(:disabled){background:#dfece2;border-color:#b9d3c2}
.code-btn:disabled{opacity:.55;cursor:not-allowed}

.err{margin:6px 0 0;font-size:11.5px;color:var(--err);line-height:1.5}
.err.center{text-align:center;margin-top:-4px}

.opts{display:flex;align-items:center;justify-content:space-between;margin-top:2px}
.check{display:inline-flex;align-items:center;gap:8px;font-size:12px;color:var(--ink2);cursor:pointer;user-select:none}
.check input{position:absolute;opacity:0;width:0;height:0}
.check i{
  width:15px;height:15px;border-radius:5px;border:1px solid #cdd6cd;background:#fff;
  display:inline-flex;align-items:center;justify-content:center;transition:.15s;flex:0 0 auto;
}
.check input:checked+i{background:var(--green);border-color:var(--green)}
.check input:checked+i::after{
  content:"";width:7px;height:4px;border-left:2px solid #fff;border-bottom:2px solid #fff;
  transform:rotate(-45deg) translate(0,-1px);
}

.agree{
  display:flex;align-items:flex-start;gap:8px;font-size:11.5px;line-height:1.7;color:var(--muted);
  cursor:pointer;user-select:none;
}
.agree>input{position:absolute;opacity:0;width:0;height:0}
.agree>i{
  width:15px;height:15px;border-radius:5px;border:1px solid #cdd6cd;background:#fff;flex:0 0 auto;
  margin-top:2px;display:inline-flex;align-items:center;justify-content:center;transition:.15s;
}
.agree>input:checked+i{background:var(--green);border-color:var(--green)}
.agree>input:checked+i::after{
  content:"";width:7px;height:4px;border-left:2px solid #fff;border-bottom:2px solid #fff;
  transform:rotate(-45deg) translate(0,-1px);
}
.link{background:none;border:0;padding:0;color:var(--green);font-size:inherit;border-bottom:1px dashed rgba(47,107,78,.4)}

.msg{
  margin:0;padding:10px 12px;border-radius:10px;font-size:12px;line-height:1.6;
  background:#fbf3f2;color:#a04432;border:1px solid #f0d8d2;
}
.msg.ok{background:#eef5ef;color:#2c6647;border-color:#d3e5d8}
.pane.mode-login .grid2{grid-template-columns:1fr}

.submit{
  position:relative;height:47px;border:0;border-radius:12px;color:#fff;
  background:linear-gradient(135deg,#337455,#22553d);
  font-size:14px;font-weight:600;letter-spacing:1px;
  display:flex;align-items:center;justify-content:center;gap:8px;
  box-shadow:0 12px 24px -12px rgba(34,85,61,.65);
  transition:transform .12s,box-shadow .15s,filter .15s;margin-top:4px;
}
.submit:hover{filter:brightness(1.05);box-shadow:0 14px 26px -12px rgba(34,85,61,.7)}
.submit:active{transform:translateY(1px)}
.submit:disabled{opacity:.65;cursor:not-allowed;filter:none}
.submit svg{width:17px;height:17px;transition:transform .15s}
.submit:hover svg{transform:translateX(2px)}
.submit .spin{
  width:14px;height:14px;border:2px solid rgba(255,255,255,.35);border-top-color:#fff;
  border-radius:50%;animation:spin .7s linear infinite;display:none;
}
.submit.busy .spin{display:inline-block}
.submit.done{background:linear-gradient(135deg,#3d8a63,#2a6a4b)}
@keyframes spin{to{transform:rotate(360deg)}}

.foot-note{margin:auto 0 0;padding-top:20px;text-align:center;font-size:10.5px;line-height:1.9;color:#b1b8b0}

.page-foot{
  width:min(460px,100%);display:flex;justify-content:space-between;
  font-size:11px;letter-spacing:4px;color:#98a69b;padding:0 6px;
}

/* ---------- 协议弹窗 ---------- */
.mask{
  position:fixed;inset:0;background:rgba(24,40,32,.42);backdrop-filter:blur(3px);
  display:flex;align-items:center;justify-content:center;padding:20px;z-index:50;
}
.doc{
  width:min(560px,100%);max-height:82vh;background:var(--card);border-radius:18px;
  display:flex;flex-direction:column;box-shadow:0 30px 60px -20px rgba(0,0,0,.35);
}
.doc header{display:flex;justify-content:space-between;align-items:flex-start;padding:22px 24px 14px;border-bottom:1px solid var(--line)}
.doc header p{margin:0 0 4px;font-size:9px;letter-spacing:2px;color:var(--muted);font-weight:600}
.doc header h2{margin:0;font-size:17px}
.doc .x{background:none;border:0;font-size:20px;line-height:1;color:var(--muted);padding:2px 6px;border-radius:8px}
.doc .x:hover{background:#f1eee5;color:var(--ink)}
.doc-body{padding:18px 24px;overflow:auto;font-size:12.5px;line-height:1.95;color:var(--ink2)}
.doc-body h3{margin:16px 0 6px;font-size:13px;color:var(--ink)}
.doc-body h3:first-child{margin-top:0}
.doc-body p{margin:0 0 8px}
.doc-body ul{margin:0 0 8px;padding-left:18px}
.doc-body li{margin:2px 0}
.doc footer{padding:14px 24px 20px;display:flex;justify-content:flex-end}
.doc-ok{
  border:0;background:var(--green);color:#fff;border-radius:10px;padding:9px 20px;font-size:12.5px;font-weight:600;
}
.doc-ok:hover{filter:brightness(1.06)}

/* ---------- 小屏 ---------- */
@media(max-width:560px){
  .auth{padding:18px 12px;justify-content:flex-start}
  .card{border-radius:20px}
  .pane{padding:24px 20px 22px}
  .page-foot{display:none}
}
@media(max-width:560px){
  .grid2{grid-template-columns:1fr}
  .code-row{grid-template-columns:1fr 118px}
  .head h1{font-size:22px}
  .mobile-brand{margin-bottom:16px;padding-bottom:14px}
}