:root{--bg: #f5f6f8;--surface: #ffffff;--primary: #2059d1;--primary-hover: #1a4ab0;--primary-light: #eef3fc;--text: #0f172a;--text-secondary: #475569;--text-muted: #94a3b8;--border: #e2e8f0;--success: #059669;--warning: #d97706;--danger: #dc2626;--radius: 10px;--radius-sm: 6px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 12px rgba(0, 0, 0, .07);--shadow-lg: 0 8px 30px rgba(0, 0, 0, .1);--font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, sans-serif;--font-mono: "SF Mono", "Cascadia Code", "Consolas", monospace}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font);background:var(--bg);color:var(--text);min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.app{max-width:960px;margin:0 auto;padding:0 20px}.top-nav{display:flex;align-items:center;height:60px;border-bottom:1px solid var(--border);margin-bottom:32px}.nav-title{font-size:17px;font-weight:600;text-decoration:none;color:var(--text);letter-spacing:-.01em;transition:color .15s}.nav-title:hover{color:var(--primary)}.content{padding-bottom:64px}.home{text-align:center;padding-top:48px}.home-heading{font-size:26px;font-weight:700;letter-spacing:-.02em;margin-bottom:8px;color:var(--text)}.home-sub{font-size:15px;color:var(--text-secondary);margin-bottom:40px}.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;max-width:620px;margin:0 auto}.tool-card{display:block;padding:32px 24px;background:var(--surface);border-radius:var(--radius);border:1px solid var(--border);text-decoration:none;color:inherit;transition:border-color .2s,box-shadow .2s,transform .15s;text-align:center}.tool-card:hover{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light);transform:translateY(-2px)}.tool-card:active{transform:translateY(0)}.tool-card .icon-wrap{width:48px;height:48px;border-radius:12px;background:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;margin:0 auto 16px}.tool-card .name{font-size:16px;font-weight:600;margin-bottom:6px}.tool-card .desc{font-size:13px;color:var(--text-secondary);line-height:1.5}.overtime-page{max-width:780px;margin:0 auto}.back-link{display:inline-flex;align-items:center;gap:6px;color:var(--text-secondary);font-size:14px;text-decoration:none;margin-bottom:20px;transition:color .15s}.back-link:hover{color:var(--primary)}.page-title{font-size:24px;font-weight:700;letter-spacing:-.02em;margin-bottom:24px;display:flex;align-items:center;gap:10px}.upload-area{border:2px dashed var(--border);border-radius:var(--radius);padding:52px 24px;text-align:center;cursor:pointer;transition:all .2s;background:var(--surface);margin-bottom:20px}.upload-area:hover,.upload-area.dragover{border-color:var(--primary);background:var(--primary-light)}.upload-icon{color:var(--text-muted);margin-bottom:12px;transition:color .2s}.upload-area:hover .upload-icon,.upload-area.dragover .upload-icon{color:var(--primary)}.upload-hint{color:var(--text-secondary);font-size:14px;line-height:1.5}.upload-hint strong{color:var(--text);font-weight:600}.upload-filename{margin-top:10px;font-size:14px;font-weight:500;color:var(--primary);font-family:var(--font-mono);font-size:13px}.privacy-note{text-align:center;font-size:13px;color:var(--text-muted);margin-bottom:28px;display:flex;align-items:center;justify-content:center;gap:6px}.summary{display:flex;gap:12px;margin-bottom:28px;flex-wrap:wrap}.summary-card{flex:1;min-width:140px;background:var(--surface);border-radius:var(--radius);border:1px solid var(--border);padding:20px;text-align:center}.summary-card .label{font-size:13px;font-weight:500;color:var(--text-muted);margin-bottom:8px;letter-spacing:.02em}.summary-card .value{font-size:28px;font-weight:700;letter-spacing:-.02em;line-height:1.1}.summary-card .unit{font-size:13px;color:var(--text-muted);margin-top:4px}.summary-card.workday .value{color:var(--primary)}.summary-card.restday .value{color:var(--warning)}.summary-card.highlight{background:var(--text);border-color:var(--text);color:#fff;transform:scale(1.04)}.summary-card.highlight .label{color:#fff9}.summary-card.highlight .value{color:#fff;font-size:36px}.summary-card.highlight .unit{color:#ffffff80}.table-wrap{overflow-x:auto;background:var(--surface);border-radius:var(--radius);border:1px solid var(--border)}table{width:100%;border-collapse:collapse;font-size:14px}th{padding:14px 16px;text-align:left;font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);border-bottom:1px solid var(--border);white-space:nowrap}td{padding:12px 16px;border-bottom:1px solid #f1f5f9}tr:last-child td{border-bottom:none}tr:hover td{background:#f8fafc}td.type-workday{color:var(--primary);font-weight:500}td.type-restday{color:var(--warning);font-weight:500}td.ot-positive{font-weight:600;color:var(--danger)}td.ot-zero{color:var(--text-muted)}.actions{margin-top:20px;display:flex;gap:10px}.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 22px;border:none;border-radius:var(--radius-sm);font-size:14px;cursor:pointer;font-weight:500;transition:all .15s;font-family:inherit}.btn:active{transform:scale(.97)}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover)}.btn-outline{background:transparent;border:1px solid var(--border);color:var(--text-secondary)}.btn-outline:hover{background:var(--bg);border-color:#cbd5e1}.empty-state{text-align:center;padding:48px 24px;color:var(--text-muted);font-size:14px;line-height:1.6}.empty-state-icon{color:#d1d5db;margin-bottom:12px}.loading{text-align:center;padding:48px;color:var(--text-muted)}