:root{--bg: #f6f7fb;--card: #ffffff;--text: #172033;--muted: #667085;--line: #e5e7eb;--primary: #2563eb;--primary-dark: #1d4ed8;--danger: #dc2626;--success: #059669;--warning: #d97706;--teacher: #7c3aed;--teacher-bg: #f5f3ff;--empty-bg: #f9fafb;--shadow: 0 14px 30px rgba(15, 23, 42, .08)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,Arial,sans-serif;line-height:1.5}header{padding:28px 24px 18px;background:linear-gradient(135deg,#1d4ed8,#7c3aed);color:#fff}header h1{margin:0;font-size:28px;letter-spacing:.02em}header p{margin:8px 0 0;opacity:.92}.sync-status{margin-top:10px;display:inline-block;font-size:13px;padding:4px 12px;border-radius:999px;background:#ffffff2e;color:#fff}.sync-status.action{cursor:pointer;background:#fff;color:var(--danger);font-weight:650}.sync-status:empty{display:none}@media print{.sync-status{display:none!important}}main{max-width:1280px;margin:0 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