:root{--ink:#17324d;--blue:#0d5593;--orange:#ef8732;--mint:#36c5a4;--paper:#f4f8fb;--line:#dbe6ee;--muted:#657789;--white:#fff}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang TC","Noto Sans TC",sans-serif;line-height:1.55}.site-header{height:76px;display:flex;align-items:center;justify-content:space-between;padding:0 max(5vw,24px);background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}.brand{display:flex;gap:12px;align-items:center;color:inherit;text-decoration:none}.brand-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:13px;background:var(--blue);color:#fff;font-weight:800}.brand strong,.brand small{display:block}.brand small{color:var(--muted);font-size:12px}.site-header nav{display:flex;gap:22px}.site-header nav a{color:var(--ink);text-decoration:none;font-weight:650}main{max-width:1120px;margin:auto;padding:56px 24px 80px}.hero{min-height:330px;display:grid;grid-template-columns:1.5fr .7fr;gap:40px;align-items:center}.eyebrow{font-size:12px;letter-spacing:.18em;color:var(--orange);font-weight:800}.hero h1,.admin-head h1,.login-panel h1{font-size:clamp(38px,6vw,70px);line-height:1.08;margin:12px 0 22px;letter-spacing:-.04em}.hero h1 em{font-style:normal;color:var(--blue)}.hero p{max-width:640px;color:var(--muted);font-size:18px}.hero-orbit{width:210px;height:210px;border:2px solid var(--line);border-radius:50%;display:grid;place-items:center;position:relative}.hero-orbit:before,.hero-orbit:after{content:"";position:absolute;border-radius:50%}.hero-orbit:before{inset:24px;border:2px dashed #a9daca}.hero-orbit:after{width:24px;height:24px;background:var(--orange);top:3px}.hero-orbit span{width:104px;height:104px;border-radius:30px;background:var(--blue);color:#fff;display:grid;place-items:center;font-size:32px;font-weight:800;box-shadow:0 20px 50px #0d559344}.course-list{display:grid;gap:20px}.course-card,.panel{background:#fff;border:1px solid var(--line);border-radius:20px;padding:28px;box-shadow:0 12px 32px #17324d0a}.course-heading{display:flex;gap:20px;align-items:flex-start}.course-heading h2,.panel h2{margin:0 0 4px}.course-heading p{margin:0;color:var(--muted)}.course-number{font-size:28px;color:var(--orange);font-weight:800}.file-list{margin-top:22px;border-top:1px solid var(--line)}.file-row{display:flex;align-items:center;gap:16px;padding:17px 4px;border-bottom:1px solid var(--line);color:inherit;text-decoration:none}.file-row:hover{color:var(--blue)}.file-icon{width:50px;flex:0 0 50px;text-align:center;padding:8px 2px;border-radius:9px;background:#e9f3fb;color:var(--blue);font-size:11px;font-weight:800}.file-info{min-width:0;flex:1}.file-info strong,.file-info small,.inventory td small{display:block}.file-info small,.inventory td small,.hint,.empty{color:var(--muted)}.download{font-weight:750;color:var(--blue)}.login-wrap{min-height:65vh;display:grid;place-items:center}.login-panel{width:min(440px,100%)}label{display:grid;gap:7px;margin:17px 0;font-weight:700}input,select,textarea{width:100%;border:1px solid #bdccd7;border-radius:10px;padding:12px 13px;font:inherit;background:#fff;color:var(--ink)}input:focus,select:focus,textarea:focus{outline:3px solid #36c5a433;border-color:var(--mint)}button{border:0;border-radius:10px;padding:10px 16px;font:inherit;font-weight:750;cursor:pointer}.primary{background:var(--blue);color:#fff}.secondary{background:#dff7f0;color:#17614f}.ghost{background:#eaf1f6;color:var(--ink)}.danger{background:#fff0f0;color:#a52b2b}.admin-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px}.admin-head h1{font-size:44px;margin:4px 0}.admin-grid{display:grid;grid-template-columns:1.35fr .65fr;gap:20px;margin-bottom:20px}.notice{padding:13px 17px;border-radius:10px;margin-bottom:18px}.notice.success{background:#dff7f0;color:#17614f}.notice.error{background:#fff0f0;color:#9c2424}.inventory{padding-bottom:12px}.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse}th,td{text-align:left;padding:14px 10px;border-bottom:1px solid var(--line)}th{font-size:12px;color:var(--muted);text-transform:uppercase}.actions{display:flex;gap:8px}.actions form{display:inline}.status{display:inline-block;padding:4px 9px;border-radius:99px;font-size:12px;font-weight:800}.status.live{background:#dff7f0;color:#17614f}.status.hidden{background:#eef1f4;color:#64717c}footer{text-align:center;color:var(--muted);padding:30px}@media(max-width:760px){.hero{grid-template-columns:1fr}.hero-orbit{display:none}.admin-grid{grid-template-columns:1fr}.site-header nav a:first-child{display:none}.file-row{align-items:flex-start}.download{display:none}.actions{flex-direction:column}.admin-head h1{font-size:34px}}