/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#1a73e8;--primary-dark:#1557b0;--accent:#ff6d00;
  --bg:#f8f9fa;--card:#fff;--text:#1f2937;--text-light:#6b7280;
  --radius:12px;--shadow:0 2px 12px rgba(0,0,0,.08);
  --max-w:1100px;
}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Noto Sans TC",sans-serif;color:var(--text);background:var(--bg);line-height:1.6}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}

/* ===== Header ===== */
.site-header{background:#fff;border-bottom:1px solid #e5e7eb;position:sticky;top:0;z-index:100}
.header-inner{max-width:var(--max-w);margin:auto;display:flex;align-items:center;justify-content:space-between;padding:14px 20px}
.logo{font-size:1.35rem;font-weight:800;color:var(--primary)}
.logo span{color:var(--accent)}
nav a{margin-left:22px;font-size:.95rem;color:var(--text);font-weight:500}
nav a:hover{color:var(--primary);text-decoration:none}

/* ===== Hero ===== */
.hero{background:linear-gradient(135deg,#1a73e8 0%,#4285f4 100%);color:#fff;text-align:center;padding:64px 20px 56px}
.hero h1{font-size:2.4rem;margin-bottom:12px}
.hero p{font-size:1.15rem;opacity:.9;max-width:600px;margin:auto}

/* ===== Tool Cards ===== */
.section{max-width:var(--max-w);margin:auto;padding:48px 20px}
.section-title{text-align:center;font-size:1.6rem;margin-bottom:8px}
.section-sub{text-align:center;color:var(--text-light);margin-bottom:36px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px 24px;transition:transform .2s,box-shadow .2s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-4px);box-shadow:0 6px 24px rgba(0,0,0,.12)}
.card-icon{font-size:2.2rem;margin-bottom:12px}
.card h3{font-size:1.15rem;margin-bottom:8px}
.card p{color:var(--text-light);font-size:.93rem;flex:1}
.card .btn{margin-top:16px}

/* ===== Buttons ===== */
.btn{display:inline-block;padding:10px 24px;border-radius:8px;font-weight:600;font-size:.95rem;text-align:center;cursor:pointer;border:none;transition:background .2s}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);text-decoration:none}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:#e65100;text-decoration:none}

/* ===== Tool Page ===== */
.tool-page{max-width:720px;margin:auto;padding:40px 20px 60px}
.tool-page h1{font-size:1.8rem;margin-bottom:8px}
.tool-page .desc{color:var(--text-light);margin-bottom:28px}
.form-group{margin-bottom:18px}
.form-group label{display:block;font-weight:600;margin-bottom:4px;font-size:.93rem}
.form-group input,.form-group select{width:100%;padding:10px 14px;border:1px solid #d1d5db;border-radius:8px;font-size:1rem}
.form-group input:focus,.form-group select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(26,115,232,.15)}
.result-box{background:#e8f5e9;border-radius:var(--radius);padding:24px;margin-top:24px}
.result-box h3{color:#2e7d32;margin-bottom:12px}
.result-item{display:flex;justify-content:space-between;padding:6px 0;border-bottom:1px solid #c8e6c9;font-size:.95rem}
.result-item:last-child{border:none}
.result-item .label{color:var(--text-light)}
.result-item .value{font-weight:700}

/* ===== CTA ===== */
.cta-box{background:linear-gradient(135deg,#fff3e0,#ffe0b2);border-radius:var(--radius);padding:32px;margin-top:40px;text-align:center}
.cta-box h3{font-size:1.2rem;margin-bottom:8px}
.cta-box p{color:var(--text-light);margin-bottom:16px;font-size:.93rem}

/* ===== Footer ===== */
.site-footer{background:#1f2937;color:#9ca3af;text-align:center;padding:32px 20px;font-size:.88rem;margin-top:48px}
.site-footer a{color:#60a5fa}

/* ===== Responsive ===== */
@media(max-width:640px){
  .hero h1{font-size:1.7rem}
  .hero p{font-size:1rem}
  .header-inner{flex-direction:column;gap:8px}
  nav a{margin-left:12px}
}