*{box-sizing:border-box}
html,body{margin:0;min-height:100%;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;color:#1f2937;background:#f5f7fb}
a{color:inherit;text-decoration:none}
.front-page{background:#000;min-height:100vh}
.image-stage{min-height:100vh;display:flex;align-items:center;justify-content:center;overflow:hidden}
.display-image{display:block;max-width:100%;max-height:100vh;width:auto;height:auto;object-fit:contain}
.empty-state{text-align:center;color:#fff;padding:32px}
.empty-icon{font-size:54px}.empty-state h1{margin:14px 0 8px;font-size:24px}.empty-state p{margin:0;color:#aaa}
.admin-body{min-height:100vh;background:linear-gradient(145deg,#f5f7fb,#eef2f8)}
.topbar{height:68px;padding:0 28px;display:flex;align-items:center;justify-content:space-between;background:#fff;border-bottom:1px solid #e5e7eb;position:sticky;top:0;z-index:10}
.topbar>div{display:flex;align-items:baseline;gap:12px}.topbar strong{font-size:18px}.topbar span{font-size:13px;color:#6b7280}.topbar nav{display:flex;gap:12px}.topbar nav a{padding:8px 12px;border-radius:8px;background:#f3f4f6;font-size:14px}
.admin-wrap{width:min(760px,calc(100% - 28px));margin:38px auto}.login-wrap{min-height:100vh;display:grid;place-items:center;padding:20px}.login-panel{width:min(420px,100%)}
.panel{background:#fff;border:1px solid #e5e7eb;border-radius:18px;padding:28px;box-shadow:0 14px 45px rgba(15,23,42,.08)}
.brand{display:inline-block;padding:6px 10px;border-radius:999px;background:#eef2ff;color:#4f46e5;font-size:13px;font-weight:700}.panel h1{margin:16px 0 8px;font-size:26px}.muted{margin:0 0 22px;color:#6b7280;line-height:1.7}
.field-label{display:block;margin-bottom:8px;font-size:14px;font-weight:700}.text-input{width:100%;height:48px;border:1px solid #d1d5db;border-radius:10px;padding:0 14px;font-size:15px;outline:none}.text-input:focus{border-color:#6366f1;box-shadow:0 0 0 3px rgba(99,102,241,.12)}
.primary-btn,.danger-btn{border:0;border-radius:10px;height:46px;padding:0 20px;font-size:15px;font-weight:700;cursor:pointer}.primary-btn{background:#4f46e5;color:#fff}.primary-btn:hover{background:#4338ca}.danger-btn{background:#fee2e2;color:#b91c1c}.login-panel .primary-btn{width:100%;margin-top:16px}
.alert{padding:12px 14px;border-radius:10px;margin:16px 0;font-size:14px}.alert.error{background:#fef2f2;color:#b91c1c;border:1px solid #fecaca}.alert.success{background:#ecfdf5;color:#047857;border:1px solid #a7f3d0}
.preview-box{height:360px;border:1px dashed #cbd5e1;border-radius:14px;background:#f8fafc;display:flex;align-items:center;justify-content:center;overflow:hidden;margin-bottom:16px}.preview-box img{width:100%;height:100%;object-fit:contain}.preview-placeholder{color:#94a3b8;font-size:15px}.hidden{display:none!important}
.upload-drop{display:flex;flex-direction:column;align-items:center;gap:4px;padding:18px;border:1px solid #dbe2ea;border-radius:12px;background:#fff;cursor:pointer;transition:.2s}.upload-drop:hover{border-color:#6366f1;background:#f8faff}.upload-drop strong{font-size:15px}.upload-drop span{font-size:13px;color:#64748b}.file-input{position:absolute;left:-9999px}
.button-row{display:flex;gap:12px;margin-top:18px;flex-wrap:wrap}.info-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:24px;padding-top:22px;border-top:1px solid #e5e7eb}.info-grid div{background:#f8fafc;border-radius:12px;padding:14px}.info-grid span{display:block;color:#64748b;font-size:13px;margin-bottom:5px}.info-grid strong{font-size:15px;word-break:break-all}
@media(max-width:640px){.topbar{height:auto;padding:14px 16px;align-items:flex-start;gap:12px}.topbar>div{display:block}.topbar span{display:block;margin-top:3px}.topbar nav{gap:6px}.topbar nav a{padding:7px 9px}.admin-wrap{margin:18px auto}.panel{padding:20px;border-radius:14px}.panel h1{font-size:23px}.preview-box{height:300px}.button-row>*{width:100%}.info-grid{grid-template-columns:1fr}.display-image{width:100%;height:auto;max-height:none}}