:root{--ink: #303133;--muted: #909399;--regular: #606266;--line: #ebeef5;--border: #dcdfe6;--paper: #f2f3f5;--sheet: #ffffff;--primary: #4a5dff;--primary-deep: #3b4fe0;--primary-soft: #eceefe;--warn: #e6a23c;--ok: #67c23a;--danger: #f56c6c;--sans: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;color:var(--ink);background:var(--paper);font-family:var(--sans);font-size:14px;line-height:1.55}*{box-sizing:border-box}body{margin:0;background:var(--paper)}button,input,textarea,select{font:inherit;color:inherit}button{cursor:pointer}a{color:var(--primary);text-decoration:none}a:hover{color:var(--primary-deep)}:focus-visible{outline:2px solid var(--primary);outline-offset:1px}.app{min-height:100vh;display:grid;grid-template-columns:210px minmax(0,1fr);background:var(--paper)}.spine{background:var(--sheet);border-right:1px solid 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a.nav-item[aria-current=page]{background:var(--primary-soft);color:var(--primary);box-shadow:inset 3px 0 0 var(--primary)}.workspace{min-width:0;display:flex;flex-direction:column;min-height:100vh}.topbar{display:flex;justify-content:space-between;align-items:center;gap:16px;height:50px;padding:0 16px;background:#fff;border-bottom:1px solid #e6e6e6;position:sticky;top:0;z-index:3}.crumb{color:var(--ink);font-weight:600}.top-actions{display:flex;gap:10px;align-items:center}.user-link{color:var(--ink)}.user-link:hover{color:var(--primary)}.quota{background:var(--primary-soft);color:var(--primary);border-radius:4px;padding:2px 8px;font-size:12px}.tags{display:flex;gap:6px;padding:6px 12px 0;background:#fff;border-bottom:1px solid var(--line)}.tag{display:inline-flex;align-items:center;height:32px;padding:0 14px;background:var(--primary-soft);color:var(--primary);border-radius:4px 4px 0 0;font-size:13px}.tag:before{content:"";width:6px;height:6px;border-radius:50%;background:var(--primary);margin-right:6px}.sheet{min-width:0;padding:12px}.opening{max-width:880px;margin:48px auto;padding:0 16px 40px}.gate{min-height:100vh;display:grid;grid-template-columns:1.15fr .85fr;background:#fff}.gate-side{background:linear-gradient(165deg,#4a5dff,#6674ff);color:#fff;padding:72px 64px;display:flex;flex-direction:column;justify-content:center}.gate-side .brand{color:#fff;border:0;height:auto;padding:0 0 16px}.gate-side .brand em{color:#ffe082}.gate-side .mark{background:#fff}.gate-side .mark path{stroke:#4a5dff}.gate-side h1{color:#fff;font-size:36px;margin:0 0 12px}.gate-side p{color:#ffffffeb;font-size:16px;max-width:28em}.gate-panel{display:flex;flex-direction:column;justify-content:center;padding:64px}.gate-panel h2{font-size:22px;margin:0 0 8px}.gate-panel form{max-width:360px}.gate-panel 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