:root{
  --pink:#ff7a9a; --pink2:#ff9a6c; --bg:#fff5f7; --card:#ffffff;
  --ink:#3a2b30; --muted:#9a8b90; --line:#ffe1e8; --ok:#2bb673;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg); color:var(--ink); line-height:1.5;
  padding-top:env(safe-area-inset-top); padding-bottom:env(safe-area-inset-bottom);
}
.hidden{display:none !important}
.screen{min-height:100vh}

/* 登录 */
.login{display:flex;align-items:center;justify-content:center;min-height:-webkit-fill-available;
  background:linear-gradient(160deg,var(--pink),var(--pink2));padding:24px}
.login-card{background:var(--card);border-radius:28px;padding:36px 26px;width:100%;max-width:360px;
  text-align:center;box-shadow:0 20px 50px rgba(255,122,154,.35)}
.login-card .logo{font-size:54px}
.login-card h1{margin:8px 0 2px;font-size:26px}
.login-card .sub{color:var(--muted);margin:0 0 22px}
#pwd{width:100%;padding:15px 16px;border:2px solid var(--line);border-radius:16px;font-size:17px;
  outline:none;margin-bottom:14px}
#pwd:focus{border-color:var(--pink)}
.err{color:#e2466b;font-size:14px;min-height:18px;margin-top:10px}

/* 按钮 */
.primary{background:linear-gradient(135deg,var(--pink),var(--pink2));color:#fff;border:none;
  border-radius:16px;padding:14px 18px;font-size:17px;font-weight:600;width:100%;cursor:pointer;
  box-shadow:0 8px 20px rgba(255,122,154,.35)}
.primary:active{transform:translateY(1px)}
.primary.big{padding:16px;font-size:18px;margin-top:6px}
.primary:disabled{opacity:.55;box-shadow:none}
.ghost{background:#fff;border:2px solid var(--line);color:var(--ink);border-radius:14px;
  padding:12px 16px;font-size:16px;width:100%;cursor:pointer;margin-top:10px}
.icon-btn{background:transparent;border:none;font-size:22px;cursor:pointer}

/* 顶栏 + tab */
.topbar{position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;
  padding:14px 18px;background:rgba(255,245,247,.9);backdrop-filter:blur(8px)}
.brand{font-size:19px;font-weight:700}
.tabs{display:flex;gap:10px;padding:4px 16px 0;position:sticky;top:52px;z-index:4;background:var(--bg)}
.tab{flex:1;background:#fff;border:2px solid var(--line);color:var(--muted);border-radius:14px 14px 0 0;
  padding:12px;font-size:16px;font-weight:600;cursor:pointer}
.tab.active{color:#fff;background:linear-gradient(135deg,var(--pink),var(--pink2));border-color:transparent}

.panel{padding:16px 16px 40px;max-width:560px;margin:0 auto}
.label{font-weight:600;margin:18px 4px 8px;font-size:15px}
.label.sm{margin:0 2px 6px;font-size:13px;color:var(--muted)}

/* 上传 */
.upload{display:block;border:2.5px dashed var(--pink);border-radius:22px;background:#fff;
  min-height:180px;display:flex;align-items:center;justify-content:center;overflow:hidden;cursor:pointer;
  position:relative}
.upload-empty{text-align:center;color:var(--muted);padding:30px}
.up-ico{font-size:46px}
.up-title{font-size:18px;font-weight:600;color:var(--ink);margin-top:8px}
.up-hint{font-size:13px;margin-top:2px}
.src-preview{width:100%;max-height:46vh;object-fit:contain;display:block;background:#faf0f3}

/* chips */
.chips{display:flex;flex-wrap:wrap;gap:9px}
.chip{background:#fff;border:2px solid var(--line);border-radius:999px;padding:9px 14px;font-size:14px;
  cursor:pointer;color:var(--ink)}
.chip.active{background:var(--pink);color:#fff;border-color:var(--pink)}

textarea,select{width:100%;border:2px solid var(--line);border-radius:14px;padding:13px;font-size:16px;
  outline:none;background:#fff;font-family:inherit;color:var(--ink)}
textarea:focus,select:focus{border-color:var(--pink)}
.row{display:flex;gap:12px;margin-top:14px}
.field{flex:1}

/* overlay */
.overlay{position:fixed;inset:0;z-index:20;background:rgba(58,43,48,.55);backdrop-filter:blur(4px);
  display:flex;align-items:center;justify-content:center;padding:18px}
.loader-card{background:#fff;border-radius:24px;padding:34px 28px;text-align:center;max-width:320px;width:100%}
.spinner{width:60px;height:60px;margin:0 auto 18px;border-radius:50%;
  border:6px solid var(--line);border-top-color:var(--pink);animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.loading-text{font-size:18px;font-weight:600}
.loading-sub{color:var(--muted);font-size:14px;margin-top:6px}
.loading-preview{width:100%;max-height:200px;object-fit:contain;border-radius:14px;margin-bottom:16px;background:#faf3f5}
.timer{margin-top:14px;font-size:15px;color:var(--pink);font-weight:600}

/* 结果 */
.result-card{background:#fff;border-radius:24px;padding:16px;max-width:520px;width:100%;max-height:92vh;
  overflow:auto}
.result-imgwrap{position:relative;border-radius:18px;overflow:hidden;background:#faf0f3}
.result-img{width:100%;display:block;object-fit:contain;max-height:64vh}
.result-img.compare{position:absolute;inset:0}
.compare-tip{position:absolute;bottom:10px;left:50%;transform:translateX(-50%);
  background:rgba(0,0,0,.55);color:#fff;border:none;border-radius:999px;padding:8px 16px;font-size:13px}
.result-actions{margin-top:14px}
.save-hint{color:var(--muted);font-size:12.5px;text-align:center;margin-top:8px;min-height:16px}

/* 历史 */
.history-card{background:#fff;border-radius:24px;padding:18px;max-width:560px;width:100%;max-height:88vh;
  display:flex;flex-direction:column}
.history-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.history-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;overflow:auto}
.history-grid img{width:100%;aspect-ratio:1;object-fit:cover;border-radius:12px;cursor:pointer;
  border:2px solid var(--line)}
.history-empty{color:var(--muted);text-align:center;padding:40px}

/* toast */
.toast{position:fixed;bottom:34px;left:50%;transform:translateX(-50%);z-index:40;
  background:rgba(58,43,48,.92);color:#fff;padding:11px 20px;border-radius:999px;font-size:14px;
  max-width:88vw;text-align:center}

.ios-install{position:fixed;left:12px;right:12px;bottom:calc(14px + env(safe-area-inset-bottom));z-index:45;
  background:#fff;border:2px solid var(--line);border-radius:16px;padding:12px 14px;font-size:13.5px;
  color:var(--ink);box-shadow:0 10px 30px rgba(255,122,154,.3);text-align:center}
.ios-install b{color:var(--pink)}
.ios-install .ios-x{display:block;margin:8px auto 0;background:var(--pink);color:#fff;border:none;
  border-radius:999px;padding:7px 18px;font-size:13px}