:root{--bg: #f4f6fb;--panel: #ffffff;--line: #e3e8f0;--primary: #1f5fae;--primary-d: #184c8c;--text: #1b2430;--muted: #6b7785;--ok: #16895a;--warn: #b9770a;--bad: #c0392b}*{box-sizing:border-box}body{margin:0;font-family:PingFang TC,Microsoft JhengHei,system-ui,sans-serif;background:var(--bg);color:var(--text)}.center{text-align:center;padding:40px;color:var(--muted)}.muted{color:var(--muted)}.ok-text{color:var(--ok);font-weight:600}.bad-text{color:var(--bad);font-weight:600}a{color:var(--primary);text-decoration:none}.topbar{display:flex;align-items:center;gap:24px;background:var(--panel);padding:12px 24px;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.brand{display:flex;align-items:center;gap:10px}.brand small{display:block;color:var(--muted);font-size:12px}.logo{width:38px;height:38px;border-radius:9px;background:var(--primary);color:#fff;display:grid;place-items:center;font-weight:700;font-size:20px}.logo.lg{width:56px;height:56px;font-size:28px;margin:0 auto 12px}.nav{display:flex;gap:6px;margin-left:auto}.nav a{padding:8px 14px;border-radius:8px;color:var(--text)}.nav a.active{background:#eaf1fb;color:var(--primary);font-weight:600}.user{display:flex;align-items:center;gap:10px;margin-left:16px;font-size:14px}.content{max-width:1080px;margin:0 auto;padding:24px}.btn,.btn-ghost,.btn-sm{border:none;border-radius:8px;cursor:pointer;font-size:14px}.btn{background:var(--primary);color:#fff;padding:9px 16px}.btn:hover{background:var(--primary-d)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-ghost{background:#eef1f6;color:var(--text);padding:9px 16px}.btn-sm{background:var(--primary);color:#fff;padding:5px 10px;font-size:13px}.btn-sm.ghost{background:#eef1f6;color:var(--text);margin-left:6px}.btn-sm:disabled{opacity:.4;cursor:not-allowed}.page-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.page-head 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td{border-bottom:none}.row-actions{white-space:nowrap}.name-cell{display:flex;align-items:center;gap:10px}.thumb{width:38px;height:38px;object-fit:cover;border-radius:6px;border:1px solid var(--line)}.filters{display:flex;gap:10px;margin-bottom:16px}.filters input,.filters select,.form-grid input,.form-grid select,.form-grid textarea,.modal input{padding:8px 11px;border:1px solid var(--line);border-radius:8px;font-size:14px}.filters input{flex:1}.tabs{display:flex;gap:6px;margin-bottom:16px}.tab{background:#eef1f6;border:none;padding:8px 16px;border-radius:8px;cursor:pointer}.tab.active{background:var(--primary);color:#fff}.badge{display:inline-block;padding:2px 9px;border-radius:999px;font-size:12px;font-weight:600}.badge.subject{background:#eaf1fb;color:var(--primary)}.badge.bad{background:#fdecea;color:var(--bad)}.badge.status-borrowed{background:#fdf2e1;color:var(--warn)}.badge.status-returned{background:#e7f6ee;color:var(--ok)}.badge.status-overdue{background:#fdecea;color:var(--bad)}.badge.role-admin{background:#f0e8fb;color:#6b3fb0}.badge.role-teacher{background:#eaf1fb;color:var(--primary)}.badge.role-viewer{background:#eef1f6;color:var(--muted)}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:20px}.form-grid label,.modal label{display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:600}.form-grid label.full{grid-column:1 / -1}.form-grid input,.form-grid select,.form-grid textarea{font-weight:400}.form-grid textarea{min-height:70px;resize:vertical}.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:18px}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#141e2d73;display:grid;place-items:center;z-index:50}.modal{background:var(--panel);border-radius:14px;padding:24px;width:380px;max-width:92vw}.modal h3{margin-top:0}.modal label{margin-bottom:12px}.modal input{width:100%}.alert{background:#fdecea;color:var(--bad);padding:10px 14px;border-radius:8px;margin-bottom:14px;font-size:14px}.login{min-height:100vh;display:grid;place-items:center}.login-card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:40px;width:380px;text-align:center;box-shadow:0 8px 30px #1e325014}.login-card h1{font-size:20px;margin:0 0 6px}.gsi-wrap{display:flex;flex-direction:column;align-items:center;gap:8px;margin:20px 0 12px;min-height:44px}@media (max-width: 760px){.cards{grid-template-columns:1fr 1fr}.form-grid{grid-template-columns:1fr}.nav{display:none}}