:root{
  --green:#1f7a3f;--green-dark:#166232;--grid:#d9d9d9;--grid-soft:#ececec;--panel:#ffffff;--text:#222;--muted:#666;
}
*{box-sizing:border-box}
body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--text);background:#f5f5f5;overflow:hidden}
.app{height:100vh;display:flex;flex-direction:column;background:
linear-gradient(to right, var(--grid) 1px, transparent 1px),
linear-gradient(to bottom, var(--grid) 1px, transparent 1px);
background-size:64px 28px;background-color:#fbfbfb}
.ribbon-top{height:34px;background:var(--green);color:#fff;display:flex;align-items:center;padding:0 14px;font-size:14px;gap:28px;white-space:nowrap}
.ribbon-right{margin-left:auto;opacity:.95}
.ribbon-main{height:88px;background:#f3f3f3;border-bottom:1px solid #cfcfcf;display:flex;align-items:flex-start;gap:20px;padding:10px 14px;overflow:hidden}
.group{min-width:110px;border-right:1px solid #ddd;padding-right:16px;height:100%}.group:last-child{border-right:none}
.group-title{margin-top:10px;font-size:12px;color:#666;text-align:center}
.group-tools{display:flex;flex-wrap:wrap;gap:8px 10px;font-size:12px;color:#333}
.formula-bar{height:36px;border-bottom:1px solid #d2d2d2;background:#fff;display:grid;grid-template-columns:72px 42px 1fr;align-items:center}
.name-box,.fx-box{height:100%;display:flex;align-items:center;justify-content:center;border-right:1px solid #ddd;font-size:13px;color:#444;background:#fafafa}
.formula-input{padding:0 12px;font-size:13px;color:#777;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sheet-wrap{position:relative;flex:1;overflow:hidden}
.sheet-grid{position:absolute;inset:0;background:
linear-gradient(to right, transparent 63px, var(--grid-soft) 63px, var(--grid-soft) 64px, transparent 64px),
linear-gradient(to bottom, transparent 27px, var(--grid-soft) 27px, var(--grid-soft) 28px, transparent 28px);
background-size:64px 28px;pointer-events:none}
.sheet-bg{position:absolute;inset:0;background-position:center;background-repeat:no-repeat;background-size:cover;opacity:.12;pointer-events:none}
.faint-cells{position:absolute;inset:0;pointer-events:none;opacity:.18;color:#444;font-size:12px}
.faint-cells .cell{position:absolute;white-space:nowrap}
.panel{position:absolute;top:56px;left:50%;transform:translateX(-50%);width:min(760px,calc(100% - 48px));background:#fff;border:1px solid #cfcfcf;border-radius:4px;box-shadow:0 1px 2px rgba(0,0,0,.08);overflow:hidden}
.panel-header{height:50px;background:var(--green);display:flex;align-items:flex-end;padding:0 16px;gap:8px}
.panel-tab{background:transparent;color:#fff;padding:10px 18px 11px;border-radius:6px 6px 0 0;font-size:16px;user-select:none}
.panel-tab.active{background:#fff;color:#1f2d3d}
.panel-body{padding:30px 24px 48px}.panel-title{font-size:18px;margin-bottom:22px}
.cards{display:flex;gap:26px;flex-wrap:wrap;justify-content:flex-start}
.card-file{width:180px;cursor:pointer;user-select:none}
.preview{height:235px;border:1px solid #d8d8d8;background:#f4f4f4;position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center}
.preview img{width:100%;height:100%;object-fit:cover;display:block}
.preview::after{content:"";position:absolute;left:0;right:0;bottom:0;height:78px;background:linear-gradient(to top,rgba(0,0,0,.82),rgba(0,0,0,0))}
.file-meta{position:relative;margin-top:-68px;color:#fff;padding:0 12px 8px;z-index:2;min-height:60px}
.file-name{font-size:15px;font-weight:500;margin-bottom:4px}.file-time{font-size:12px;opacity:.95}
.download-all{display:block;margin:24px auto 0;border:2px solid #333;background:#fff;color:#111;font-weight:700;padding:10px 22px;font-size:16px;cursor:pointer}
.sheet-tabs{height:34px;border-top:1px solid #d4d4d4;background:#f3f3f3;display:flex;align-items:center;padding:0 10px;gap:10px}
.sheet-arrow{font-size:18px;color:#666}
.sheet-tab2{background:#f7f7f7;border:1px solid #ccc;border-bottom:2px solid transparent;border-radius:2px 2px 0 0;padding:6px 14px;font-size:14px;color:#555;font-weight:600;cursor:pointer}
.sheet-tab2.active{background:#fff;border-bottom-color:var(--green);color:var(--green-dark)}
.statusbar{height:22px;border-top:1px solid #d4d4d4;background:#f8f8f8;display:flex;align-items:center;justify-content:space-between;padding:0 10px;font-size:12px;color:#666}
.modal-backdrop-safe{position:fixed;inset:0;background:rgba(0,0,0,.38);display:none;align-items:center;justify-content:center;z-index:50;padding:20px}
.modal-safe{width:min(420px,100%);background:#fff;border-radius:10px;box-shadow:0 20px 50px rgba(0,0,0,.2);overflow:hidden}
.modal-safe-head{padding:18px 20px;border-bottom:1px solid #ececec;font-size:20px;font-weight:700}
.modal-safe-body{padding:18px 20px 20px}.modal-safe-sub{color:#666;font-size:13px;margin-bottom:14px}
.form-control{width:100%;min-height:40px;padding:8px 10px;border:1px solid #ccc;border-radius:6px}
.form-group{margin-bottom:14px}.error-box{margin:-2px 0 14px;color:#b3261e;font-size:13px}
.hidden{display:none !important}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:9px 16px;border-radius:6px;border:1px solid transparent;cursor:pointer;font-weight:600}
.btn-success{background:var(--green);color:#fff}.btn-success:hover{background:var(--green-dark)}.btn:disabled{opacity:.8;cursor:wait}
.btn-loader{width:16px;height:16px;border:2px solid rgba(255,255,255,.35);border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.close-link{background:none;border:none;color:#666;padding:0;font-size:13px;cursor:pointer}
.actions{display:flex;justify-content:space-between;align-items:center}
@media (max-width:800px){.ribbon-main{display:none}.panel{top:24px}.cards{justify-content:center}}