/* ============================================================================
   后台登录页样式 —— 严格按参考图1（中国移动云盘登录页）还原：
   浅蓝渐变全屏背景 / 底部水波纹装饰 / 左侧品牌文案 / 右侧白色登录卡
   （选项卡 + 灰底输入框 + 卡内蓝色链接 + 渐变蓝大按钮 + 协议勾选）
   ============================================================================ */
* { margin: 0; padding: 0; box-sizing: border-box; }
body.alogin {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  min-height: 100vh; color: #26303e; font-size: 14px; line-height: 1.6;
  background: linear-gradient(160deg, #d7e5f6 0%, #dbe8f8 30%, #eef4fb 70%, #f6f9fe 100%);
  position: relative; overflow-x: hidden;
}

/* ---- 顶部导航 ---- */
.lg-top { position: relative; z-index: 5; display: flex; align-items: center;
  padding: 22px 46px; }
.lg-brand { display: flex; align-items: center; gap: 10px; }
.lg-brand .ic { width: 38px; height: 38px; border-radius: 10px; color: #fff; font-weight: 700;
  font-size: 19px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #4a8af4, #2461d8);
  box-shadow: 0 6px 14px rgba(36, 97, 216, .35); }
.lg-brand .t { font-size: 19px; font-weight: 700; color: #1c2b45; letter-spacing: 1px; }
.lg-nav { margin-left: auto; display: flex; align-items: center; gap: 30px; }
.lg-nav a { color: #3d4a63; font-size: 14px; transition: color .2s; }
.lg-nav a:hover { color: #2461d8; }
.lg-nav .pill { background: linear-gradient(135deg, #ffd08a, #ffb64d);
  color: #7a4a00; font-weight: 600; padding: 7px 20px; border-radius: 999px;
  box-shadow: 0 4px 12px rgba(255, 168, 60, .4); }
.lg-nav .pill:hover { color: #7a4a00; filter: brightness(1.04); transform: translateY(-1px); }

/* ---- 主体两栏 ---- */
.lg-main { position: relative; z-index: 5; max-width: 1180px; margin: 0 auto;
  display: flex; align-items: center; min-height: calc(100vh - 170px);
  padding: 20px 46px 60px; gap: 60px; }

/* 左侧品牌区 */
.lg-hero { flex: 1; color: #1c2b45; }
.lg-hero h1 { font-size: 40px; font-weight: 800; letter-spacing: 2px;
  text-shadow: 0 2px 0 rgba(255,255,255,.6); }
.lg-hero .desc { margin-top: 18px; color: #4a5a78; font-size: 15px; line-height: 2;
  letter-spacing: 1px; }
.lg-hero .desc span { display: block; }
.lg-float { margin-top: 46px; position: relative; height: 120px; }
.lg-cube { position: absolute; left: 6px; top: 0; width: 108px; height: 108px;
  border-radius: 26px; background: linear-gradient(160deg, #ffffff, #dcebfb);
  box-shadow: 0 18px 34px rgba(47, 111, 228, .22), inset 0 -6px 12px rgba(120, 160, 220, .18);
  display: flex; align-items: center; justify-content: center;
  font-size: 34px; font-weight: 800; color: #2461d8;
  animation: floaty 4.5s ease-in-out infinite; }
.lg-cube em { font-style: normal; font-size: 15px; margin-left: 2px; color: #5b9cf8; }
.lg-orb { position: absolute; border-radius: 50%;
  background: linear-gradient(160deg, #ffffff, #cfe3fa);
  box-shadow: 0 10px 22px rgba(47, 111, 228, .18);
  display: flex; align-items: center; justify-content: center; font-size: 11px; color: #4a7bd8;
  animation: floaty 4.5s ease-in-out infinite; }
.lg-orb.o1 { width: 64px; height: 64px; left: 132px; top: 8px; animation-delay: .4s; }
.lg-orb.o2 { width: 54px; height: 54px; left: 66px; top: 62px; animation-delay: .9s; }
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }

/* ---- 右侧登录卡 ---- */
.lg-card-wrap { position: relative; flex: none; }
.lg-card { width: 400px; background: #fff; border-radius: 12px; padding: 30px 34px 26px;
  box-shadow: 0 18px 50px rgba(31, 60, 136, .16); position: relative; }
/* 右上角二维码装饰（参考图同款折角） */
.lg-card .qr-corner { position: absolute; top: 0; right: 0; width: 52px; height: 52px;
  background: linear-gradient(225deg, #e8f1fd 50%, transparent 50%);
  border-radius: 0 12px 0 0; display: flex; align-items: flex-start; justify-content: flex-end;
  padding: 7px; color: #8fb4e8; cursor: pointer; transition: .2s; }
.lg-card .qr-corner:hover { color: #2461d8; }
.lg-card .qr-corner svg { width: 18px; height: 18px; }

.lg-tabs { display: flex; gap: 34px; margin-bottom: 26px; }
.lg-tab { font-size: 15.5px; color: #6b7690; cursor: pointer; padding-bottom: 10px;
  position: relative; transition: color .2s; }
.lg-tab.on { color: #2461d8; font-weight: 600; }
.lg-tab.on::after { content: ""; position: absolute; left: 50%; transform: translateX(-50%);
  bottom: 0; width: 28px; height: 3px; border-radius: 3px; background: #2461d8; }

.lg-field { position: relative; margin-bottom: 16px; }
.lg-input { width: 100%; height: 46px; border: 1px solid transparent; border-radius: 7px;
  background: #f3f6fa; padding: 0 14px; font-size: 14px; outline: none; color: #26303e;
  transition: border .2s, background .2s; font-family: inherit; }
.lg-input::placeholder { color: #a5aebf; }
.lg-input:focus { border-color: #4a8af4; background: #fff;
  box-shadow: 0 0 0 3px rgba(74, 138, 244, .14); }
.lg-input.has-btn { padding-right: 96px; }
.lg-inline { position: absolute; right: 13px; top: 50%; transform: translateY(-50%);
  font-size: 13px; color: #2461d8; cursor: pointer; user-select: none; }
.lg-inline:hover { text-decoration: underline; }

.lg-note { font-size: 12px; color: #9aa4b8; margin: 2px 0 16px; }

.lg-btn { width: 100%; height: 46px; border: none; border-radius: 7px; cursor: pointer;
  color: #fff; font-size: 16px; font-weight: 600; letter-spacing: 4px; font-family: inherit;
  background: linear-gradient(90deg, #5b96f7 0%, #3d7ef2 100%);
  box-shadow: 0 8px 18px rgba(61, 126, 242, .35); transition: all .2s; }
.lg-btn:hover { filter: brightness(1.06); transform: translateY(-1px);
  box-shadow: 0 10px 22px rgba(61, 126, 242, .45); }
.lg-btn:active { transform: translateY(0); }
.lg-btn[disabled] { opacity: .6; cursor: not-allowed; transform: none; }

.lg-agree { margin-top: 16px; font-size: 12px; color: #9aa4b8; display: flex;
  align-items: flex-start; gap: 7px; }
.lg-agree input { margin-top: 3px; accent-color: #2461d8; }
.lg-agree a { color: #2461d8; }
.lg-agree a:hover { text-decoration: underline; }
.lg-back { text-align: center; margin-top: 18px; }
.lg-back a { font-size: 13px; color: #6b7690; }
.lg-back a:hover { color: #2461d8; }

/* ---- 底部水波纹装饰（参考图同款同心椭圆） ---- */
.lg-ripple { position: fixed; left: 50%; bottom: -60px; transform: translateX(-50%);
  width: 1400px; height: 260px; pointer-events: none; z-index: 1; }
.lg-ripple i { position: absolute; left: 50%; bottom: 0; transform: translateX(-50%);
  border: 1.5px solid rgba(255, 255, 255, .75); border-radius: 50%;
  box-shadow: 0 0 24px rgba(120, 170, 235, .12) inset; animation: rippleGrow 6s ease-out infinite; }
.lg-ripple i:nth-child(1) { width: 420px; height: 130px; }
.lg-ripple i:nth-child(2) { width: 640px; height: 190px; animation-delay: .8s; }
.lg-ripple i:nth-child(3) { width: 880px; height: 250px; animation-delay: 1.6s; }
@keyframes rippleGrow {
  0%   { opacity: 0; transform: translateX(-50%) scale(.86); }
  35%  { opacity: 1; }
  100% { opacity: 0; transform: translateX(-50%) scale(1.12); }
}

@media (max-width: 980px) {
  .lg-hero { display: none; }
  .lg-card { width: min(400px, 92vw); }
}