*{margin:0;padding:0;box-sizing:border-box}
:root{--primary:#1a365d;--primary-light:#2c5282;--accent:#319795;--accent-light:#4fd1c5;--bg:#f7fafc;--card:#fff;--border:#e2e8f0;--text:#1a202c;--text2:#718096}
body{font-family:"Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif;background:var(--bg);color:var(--text);line-height:1.7}
.navbar{display:flex;align-items:center;justify-content:space-between;padding:1rem 2rem;background:var(--primary);position:sticky;top:0;z-index:100;box-shadow:0 2px 8px rgba(0,0,0,0.15)}
.logo{font-size:1.4rem;font-weight:700;color:#fff;text-decoration:none;letter-spacing:1px}
.logo span{color:var(--accent-light)}
.nav-links{display:flex;gap:1.5rem;list-style:none;align-items:center}
.nav-links a{color:rgba(255,255,255,0.85);text-decoration:none;font-size:0.95rem;transition:color 0.2s}
.nav-links a:hover,.nav-links a.active{color:#fff}
.nav-links .active{border-bottom:2px solid var(--accent-light)}
.breadcrumb{background:var(--card);border-bottom:1px solid var(--border);padding:0.75rem 2rem;font-size:0.85rem;color:var(--text2)}
.breadcrumb a{color:var(--primary);text-decoration:none}
.hero{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-light) 100%);color:#fff;padding:4rem 2rem;text-align:center}
.hero h1{font-size:2.5rem;margin-bottom:1rem;font-weight:700}
.hero p{font-size:1.2rem;opacity:0.9;max-width:600px;margin:0 auto 1.5rem}
.hero-btns{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}
.btn-primary{display:inline-block;padding:0.75rem 1.5rem;background:var(--accent);color:#fff;text-decoration:none;border-radius:8px;font-weight:600;transition:background 0.2s}
.btn-primary:hover{background:var(--accent-light)}
.btn-secondary{display:inline-block;padding:0.75rem 1.5rem;background:rgba(255,255,255,0.15);color:#fff;text-decoration:none;border-radius:8px;font-weight:600;border:1px solid rgba(255,255,255,0.3);transition:background 0.2s}
.btn-secondary:hover{background:rgba(255,255,255,0.25)}
.container{max-width:1200px;margin:0 auto;padding:2rem}
.section-title{font-size:1.8rem;color:var(--primary);margin-bottom:1.5rem;padding-bottom:0.5rem;border-bottom:3px solid var(--accent)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.5rem}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1.5rem;transition:transform 0.2s,box-shadow 0.2s;text-decoration:none;color:inherit;display:block}
.card:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(0,0,0,0.1)}
.card-icon{font-size:2.5rem;margin-bottom:0.75rem}
.card h3{font-size:1.1rem;color:var(--primary);margin-bottom:0.5rem}
.card p{font-size:0.9rem;color:var(--text2);line-height:1.5}
.tool-page{max-width:900px;margin:0 auto;padding:2rem}
.tool-page h1{font-size:2rem;color:var(--primary);margin-bottom:0.5rem}
.tool-calc{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:2rem;margin:1.5rem 0}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.form-group{margin-bottom:1rem}
.form-group label{display:block;font-weight:600;margin-bottom:0.5rem;color:var(--primary)}
input,select,textarea{width:100%;padding:0.75rem;border:1px solid var(--border);border-radius:8px;font-size:1rem;font-family:inherit;transition:border-color 0.2s}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(49,151,149,0.1)}
.btn{width:100%;padding:1rem;background:var(--primary);color:#fff;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:background 0.2s;margin-top:0.5rem}
.btn:hover{background:var(--primary-light)}
.btn-accent{background:var(--accent)}
.btn-accent:hover{background:var(--accent-light)}
.result-box{margin-top:1.5rem;padding:1.5rem;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:12px;color:#fff;display:none}
.result-box h3{font-size:1.5rem;margin-bottom:0.5rem}
.copy-btn{float:right;padding:0.3rem 0.8rem;background:rgba(255,255,255,0.2);color:#fff;border:1px solid rgba(255,255,255,0.4);border-radius:6px;cursor:pointer;font-size:0.8rem}
.copy-btn:hover{background:rgba(255,255,255,0.3)}
.article-page{max-width:750px;margin:0 auto;padding:2rem}
.article-page h1{font-size:2rem;color:var(--primary);line-height:1.4;margin-bottom:1rem}
.article-page .meta{color:var(--text2);font-size:0.9rem;margin-bottom:1.5rem}
.article-page img{width:100%;border-radius:8px;margin:1rem 0;max-height:400px;object-fit:cover}
.article-page h2{font-size:1.4rem;color:var(--primary);margin:2rem 0 1rem;padding-top:1rem;border-top:1px solid var(--border)}
.article-page h3{font-size:1.15rem;color:var(--primary-light);margin:1.5rem 0 0.75rem}
.article-page p{margin-bottom:1rem;line-height:1.8}
.article-page ul,.article-page ol{margin:1rem 0 1rem 1.5rem}
.article-page li{margin-bottom:0.5rem}
.article-page blockquote{background:#edf2f7;border-left:4px solid var(--accent);padding:1rem;margin:1rem 0;border-radius:0 8px 8px 0;font-style:italic}
.article-page .tip-box{background:#e6fffa;border:1px solid var(--accent);border-radius:8px;padding:1rem;margin:1rem 0}
.article-page table{width:100%;border-collapse:collapse;margin:1rem 0;font-size:0.95rem}
.article-page th{background:var(--primary);color:#fff;padding:0.75rem;text-align:left}
.article-page td{padding:0.6rem;border-bottom:1px solid var(--border)}
.article-page tr:nth-child(even){background:var(--bg)}
.article-content{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1.5rem;margin:2rem 0}
.footer{background:var(--primary);color:rgba(255,255,255,0.7);padding:3rem 2rem;margin-top:3rem;text-align:center}
.footer-inner{max-width:1200px;margin:0 auto}
.footer-links{display:flex;gap:2rem;justify-content:center;flex-wrap:wrap;margin-bottom:1.5rem}
.footer-links a{color:rgba(255,255,255,0.7);text-decoration:none;font-size:0.9rem}
.footer-links a:hover{color:#fff}
.footer p{font-size:0.85rem;opacity:0.7}
.formula-box{background:#f0f4f8;border:1px solid #cbd5e0;border-radius:8px;padding:1rem;margin:1rem 0;text-align:center;font-size:1.3rem;font-family:serif}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:2rem;margin:1.5rem 0}
@media(max-width:768px){.two-col{grid-template-columns:1fr}.form-row{grid-template-columns:1fr}.nav-links{display:none}.hero h1{font-size:1.8rem}.grid{grid-template-columns:1fr 1fr}}
@media(max-width:480px){.grid{grid-template-columns:1fr}}