:root{--primary:#2563eb;--primary-dark:#1d4ed8;--secondary:#10b981;--accent:#f59e0b;--dark:#1e293b;--text:#334155;--text-light:#64748b;--bg:#f8fafc;--card:#ffffff;--border:#e2e8f0;--radius:12px;--shadow:0 4px 6px -1px rgba(0,0,0,0.1)}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,'PingFang TC','Microsoft JhengHei',sans-serif;color:var(--text);background:var(--bg);line-height:1.7}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}
.site-header{background:white;box-shadow:0 1px 3px rgba(0,0,0,0.08);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.5rem;max-width:1200px;margin:0 auto;flex-wrap:wrap}
.logo{font-size:1.4rem;font-weight:700;color:var(--dark);display:flex;align-items:center;gap:0.5rem}
.logo:hover{text-decoration:none}
.main-nav{display:flex;gap:1.25rem;flex-wrap:wrap}
.main-nav a{color:var(--text);font-weight:500;padding:0.5rem 0;border-bottom:2px solid transparent;transition:all 0.2s;font-size:0.95rem}
.main-nav a:hover,.main-nav a.active{color:var(--primary);border-bottom-color:var(--primary);text-decoration:none}
.breadcrumb{padding:1rem 0;color:var(--text-light);font-size:0.875rem}
.breadcrumb a{color:var(--primary)}
.hero{background:linear-gradient(135deg,#2563eb,#1d4ed8,#7c3aed);color:white;padding:4rem 0;text-align:center;border-radius:0 0 48px 48px;margin-bottom:3rem}
.hero h1{font-size:2.25rem;font-weight:800;margin-bottom:0.75rem;line-height:1.3}
.hero p{font-size:1.15rem;opacity:0.9;max-width:600px;margin:0 auto}
.hero .tagline{background:rgba(255,255,255,0.15);display:inline-block;padding:0.35rem 1rem;border-radius:20px;font-size:0.85rem;margin-bottom:1rem}
.page-header{text-align:center;padding:2.5rem 0 1.5rem}
.page-header h1{font-size:2rem;font-weight:700;color:var(--dark);margin-bottom:0.5rem}
.page-header p{color:var(--text-light);font-size:1.05rem}
.subject-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:1rem;padding:1.5rem 0}
.subject-card{background:white;border-radius:var(--radius);padding:1.25rem;text-align:center;border:1px solid var(--border);transition:all 0.2s;display:block;text-decoration:none;color:var(--text)}
.subject-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--primary);text-decoration:none}
.subject-card .emoji{font-size:2.5rem;margin-bottom:0.5rem}
.subject-card .name{font-weight:600;font-size:0.95rem}
.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:1.25rem;padding:1.5rem 0}
.tool-card{background:white;border-radius:var(--radius);padding:1.25rem;text-align:center;border:1px solid var(--border);transition:all 0.2s;display:block;text-decoration:none;color:var(--text)}
.tool-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--primary);text-decoration:none}
.tool-card .tool-icon{font-size:2.25rem;margin-bottom:0.75rem}
.tool-card .tool-name{font-weight:600;font-size:0.9rem;line-height:1.3}
.tool-card .tool-desc{font-size:0.8rem;color:var(--text-light);margin-top:0.25rem}
.tool-detail{background:white;border-radius:var(--radius);padding:2rem;margin:1.5rem 0;box-shadow:0 2px 4px rgba(0,0,0,0.06)}
.tool-header{display:flex;align-items:center;gap:1rem;margin-bottom:1.5rem;padding-bottom:1.25rem;border-bottom:1px solid var(--border)}
.tool-header .tool-icon{font-size:2.75rem}
.tool-header h1{font-size:1.6rem;font-weight:700;color:var(--dark)}
.tool-category{display:inline-block;background:var(--primary);color:white;padding:0.2rem 0.7rem;border-radius:20px;font-size:0.75rem;font-weight:600;margin-top:0.3rem}
.form-group{margin-bottom:1.25rem}
.form-group label{display:block;font-weight:600;margin-bottom:0.4rem;color:var(--text);font-size:0.95rem}
.form-group input,.form-group select,.form-group textarea{width:100%;padding:0.7rem;border:1px solid var(--border);border-radius:8px;font-family:inherit;font-size:1rem;background:white}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,0.1)}
.btn-primary{display:inline-block;background:var(--primary);color:white;padding:0.7rem 1.5rem;border-radius:8px;font-weight:600;border:none;cursor:pointer;font-size:1rem;transition:background 0.2s}
.btn-primary:hover{background:var(--primary-dark);text-decoration:none}
.btn-secondary{display:inline-block;background:white;color:var(--primary);padding:0.7rem 1.5rem;border-radius:8px;font-weight:600;border:1px solid var(--primary);cursor:pointer;font-size:1rem;transition:all 0.2s}
.btn-secondary:hover{background:var(--primary);color:white;text-decoration:none}
.articles-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:1.5rem;padding:1.5rem 0}
.article-card{background:white;border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);transition:all 0.2s;display:block;text-decoration:none}
.article-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);text-decoration:none}
.article-card .article-img{height:170px;background:linear-gradient(135deg,#2563eb,#7c3aed);display:flex;align-items:center;justify-content:center;font-size:2.8rem;color:white}
.article-card .article-content{padding:1.25rem}
.article-card h3{font-size:1.05rem;color:var(--dark);margin-bottom:0.4rem;line-height:1.4}
.article-card p{color:var(--text-light);font-size:0.85rem;line-height:1.6}
.read-time{color:var(--primary);font-size:0.8rem;font-weight:500}
.article-detail{background:white;border-radius:var(--radius);padding:2rem;margin:1.5rem auto;max-width:860px;box-shadow:0 2px 4px rgba(0,0,0,0.06)}
.article-detail h1{font-size:1.85rem;font-weight:700;color:var(--dark);line-height:1.3;margin-bottom:0.5rem}
.article-meta{color:var(--text-light);font-size:0.875rem;margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:1px solid var(--border)}
.article-featured-img{background:linear-gradient(135deg,#2563eb,#7c3aed);height:280px;border-radius:10px;margin-bottom:1.5rem;display:flex;align-items:center;justify-content:center;font-size:4rem;color:white;opacity:0.9}
.article-detail h2{font-size:1.35rem;color:var(--dark);margin:1.75rem 0 0.75rem;padding-top:0.5rem;border-top:1px solid var(--border)}
.article-detail p{color:var(--text);line-height:1.85;font-size:1rem;margin-bottom:1rem}
.article-detail a{color:var(--primary)}
.article-detail ul{list-style:disc;padding-left:1.5rem;margin-bottom:1rem;color:var(--text)}
.article-nav{display:flex;justify-content:space-between;margin-top:2.5rem;padding-top:1.5rem;border-top:1px solid var(--border);gap:1rem;flex-wrap:wrap}
.article-nav a{min-width:150px;text-align:center;padding:0.6rem 1rem;border-radius:8px;font-weight:600}
.static-page{max-width:780px;margin:3rem auto;padding:2rem;background:white;border-radius:var(--radius);box-shadow:0 2px 4px rgba(0,0,0,0.06)}
.static-page h1{font-size:1.85rem;color:var(--dark);margin-bottom:1.25rem}
.static-page h2{font-size:1.2rem;color:var(--dark);margin:1.5rem 0 0.6rem}
.static-page p{color:var(--text);line-height:1.8;margin-bottom:0.9rem}
.static-page ul{list-style:disc;padding-left:1.5rem;margin-bottom:0.9rem;color:var(--text);line-height:1.8}
.site-footer{background:var(--dark);color:white;padding:2.5rem 0 1.5rem;margin-top:3.5rem}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:1.5rem;margin-bottom:1.5rem}
.footer-col h4{font-size:0.95rem;margin-bottom:0.75rem}
.footer-col ul{list-style:none;padding:0}
.footer-col ul li{margin-bottom:0.4rem}
.footer-col a{color:rgba(255,255,255,0.65);font-size:0.875rem}
.footer-col a:hover{color:white}
.footer-bottom{text-align:center;padding-top:1.25rem;border-top:1px solid rgba(255,255,255,0.1);font-size:0.85rem;color:rgba(255,255,255,0.5)}
.subject-section{margin-bottom:2.5rem}
.subject-section h2{font-size:1.25rem;color:var(--dark);margin-bottom:1rem;padding-bottom:0.5rem;border-bottom:2px solid var(--primary);display:inline-block}
@media(max-width:768px){.main-nav{gap:0.6rem;font-size:0.875rem}.hero{border-radius:0 0 30px 30px;padding:2.5rem 0}.hero h1{font-size:1.6rem}.subject-grid{grid-template-columns:repeat(auto-fill,minmax(120px,1fr))}.tools-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}.article-detail{padding:1.25rem}.static-page{margin:1rem;padding:1.25rem}.footer-grid{grid-template-columns:1fr;text-align:center}}