/* ============================================================
   Clinical Research Stats - Global Styles v2
   Design: Minimal medical, clean whitespace, professional
   ============================================================ */
:root {
  --primary: #0F52BA;
  --primary-light: #E8F0FE;
  --primary-dark: #0B3D8A;
  --success: #2E7D32;
  --success-light: #E8F5E9;
  --error: #D32F2F;
  --error-light: #FFEBEE;
  --bg: #FFFFFF;
  --surface: #F8F9FA;
  --nav-bg: #111827;
  --nav-text: #FFFFFF;
  --text: #1A202C;
  --text-secondary: #4A5568;
  --text-muted: #A0AEC0;
  --border: #E2E8F0;
  --radius: 10px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-cn: 'Noto Sans SC', -apple-system, 'PingFang SC', sans-serif;
  --max-width: 1100px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-font-smoothing:antialiased}
body{font-family:var(--font-sans);color:var(--text);background:var(--bg);line-height:1.6;min-height:100vh}

/* Navigaton */
.navbar{background:var(--nav-bg);color:var(--nav-text);padding:0 24px;height:56px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100}
.navbar-brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--nav-text);font-weight:500;font-size:14px}
.navbar-links{display:flex;align-items:center;gap:20px;list-style:none}
.navbar-links a{color:rgba(255,255,255,0.8);text-decoration:none;font-size:13px;transition:color 0.15s}
.navbar-links a:hover{color:#fff}
.lang-toggle{display:flex;align-items:center;gap:6px;cursor:pointer;padding:6px 14px;border:1px solid rgba(255,255,255,0.25);border-radius:8px;font-size:12px;color:var(--nav-text);background:transparent;transition:all 0.15s;user-select:none}
.lang-toggle:hover{border-color:rgba(255,255,255,0.5);background:rgba(255,255,255,0.08)}
.privacy-notice{background:var(--success-light);color:var(--success);text-align:center;padding:7px 16px;font-size:11px;font-weight:500;letter-spacing:0.2px}
.container{max-width:var(--max-width);margin:0 auto;padding:0 20px}

/* Hero */
.hero{text-align:center;padding:48px 20px 32px;background:var(--surface);border-bottom:1px solid var(--border)}
.hero h1{font-size:26px;font-weight:600;color:var(--text);margin-bottom:6px}
.hero .tagline{font-size:14px;color:var(--text-secondary);margin-bottom:2px}
.hero .tagline-sub{font-size:12px;color:var(--text-muted)}

/* Category Grid (Homepage) */
.cat-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:16px;padding:40px 0}
@media(max-width:900px){.cat-grid{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.cat-grid{grid-template-columns:1fr}}
.cat-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:24px;cursor:pointer;transition:all 0.2s;text-decoration:none;color:var(--text);display:flex;flex-direction:column;gap:6px}
.cat-card:hover{border-color:var(--primary);box-shadow:0 2px 12px rgba(15,82,186,0.08);transform:translateY(-2px)}
.cat-card-icon{font-size:24px;margin-bottom:4px}
.cat-card h2{font-size:16px;font-weight:600}
.cat-card .cat-en{font-size:12px;color:var(--text-secondary)}
.cat-card .cat-count{font-size:11px;color:var(--text-muted);margin-top:4px}
.cat-card.sci{background:#FFFBEB;border-color:#FDE68A}
.cat-card.sci:hover{border-color:#F59E0B}

/* Tool List Page (category page) */
.category-page{padding:32px 0}
.category-header{margin-bottom:24px}
.category-header h1{font-size:22px;font-weight:600;margin-bottom:4px}
.category-header .cat-desc{font-size:13px;color:var(--text-secondary)}
.tool-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:700px){.tool-grid{grid-template-columns:1fr}}
.tool-item{display:flex;align-items:center;gap:14px;padding:16px 18px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);text-decoration:none;color:var(--text);transition:all 0.15s}
.tool-item:hover{border-color:var(--primary);background:var(--primary-light)}
.tool-item-icon{width:40px;height:40px;border-radius:8px;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:16px;font-weight:600;color:var(--primary);background:var(--primary-light)}
.tool-item-text{flex:1}
.tool-item-title{font-size:14px;font-weight:500;line-height:1.3}
.tool-item-desc{font-size:11px;color:var(--text-secondary);margin-top:1px}
.tool-item-badge{font-size:10px;padding:2px 8px;border-radius:4px;background:var(--primary-light);color:var(--primary);margin-left:auto;flex-shrink:0}

/* Tool Detail Page */
.tool-page{padding:24px 0 40px}
.tool-detail-header{margin-bottom:20px}
.tool-detail-header h1{font-size:20px;font-weight:600;margin-bottom:2px}
.tool-detail-header p{font-size:13px;color:var(--text-secondary)}
.tool-layout{display:grid;grid-template-columns:1fr 1fr;gap:20px}
@media(max-width:850px){.tool-layout{grid-template-columns:1fr}}
.tool-input-panel,.tool-result-panel{background:var(--surface);border-radius:var(--radius);padding:20px;border:1px solid var(--border)}
.tool-section-title{font-size:14px;font-weight:600;margin-bottom:16px}
.form-group{margin-bottom:14px}
.form-group label{display:block;font-size:12px;font-weight:500;color:var(--text-secondary);margin-bottom:4px}
.form-group input,.form-group select,.form-group textarea{width:100%;padding:8px 12px;border:1px solid var(--border);border-radius:8px;font-size:13px;font-family:var(--font-sans);color:var(--text);background:var(--bg);transition:border-color 0.15s}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 2px rgba(15,82,186,0.12)}
.form-group textarea{min-height:70px;resize:vertical;font-family:'SF Mono','Cascadia Code',Consolas,monospace;font-size:12px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}
@media(max-width:500px){.form-row{grid-template-columns:1fr}}
.btn-row{display:flex;gap:10px;margin-top:16px}
.btn{padding:8px 20px;border-radius:8px;font-size:13px;font-weight:500;cursor:pointer;border:none;transition:all 0.15s;font-family:var(--font-sans)}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark)}
.btn-reset{background:var(--border);color:var(--text)}
.btn-reset:hover{background:#D0D5DD}
.btn-sm{padding:4px 12px;font-size:11px}
.btn-copy{background:var(--success);color:#fff}
.btn-copy:hover{background:#1B5E20}
.btn-download{background:var(--bg);color:var(--text);border:1px solid var(--border)}
.btn-download:hover{background:var(--primary-light);border-color:var(--primary)}

/* Result */
.result-box{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin-bottom:12px;min-height:50px}
.result-label{font-size:11px;color:var(--text-muted);margin-bottom:4px}
.result-value{font-size:22px;font-weight:600;color:var(--primary)}
.result-stat{font-size:12px;color:var(--text-secondary);font-family:'SF Mono',Consolas,monospace;line-height:1.7}
.result-interp{font-size:12px;color:var(--text-secondary);margin-top:6px;line-height:1.6}
.result-actions{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}
.chart-area{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin-bottom:12px;min-height:180px}
.ref-box{font-size:11px;color:var(--text-muted);padding:8px 12px;background:var(--surface);border-radius:var(--radius);margin-top:12px;line-height:1.6}
.error-text{font-size:12px;color:var(--error);margin-top:4px}
.ad-slot{max-width:728px;margin:16px auto;height:90px;background:#F0F0F0;border-radius:var(--radius);display:flex;align-items:center;justify-content:center;font-size:11px;color:var(--text-muted)}

/* Footer */
.footer{background:var(--nav-bg);color:rgba(255,255,255,0.6);padding:28px 20px;text-align:center;font-size:11px;margin-top:40px}
.footer-links{display:flex;justify-content:center;gap:24px;margin-bottom:10px;flex-wrap:wrap}
.footer-links a{color:rgba(255,255,255,0.6);text-decoration:none}
.footer-links a:hover{color:#fff}

/* Back button */
.back-link{display:inline-flex;align-items:center;gap:6px;font-size:12px;color:var(--text-secondary);text-decoration:none;margin-bottom:16px}
.back-link:hover{color:var(--primary)}

/* Breadcrumb */
.breadcrumb{display:flex;gap:6px;font-size:12px;color:var(--text-muted);margin-bottom:16px}
.breadcrumb a{color:var(--primary);text-decoration:none}
.breadcrumb a:hover{text-decoration:underline}

/* Chart container */
.chart-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin-top:12px}
.chart-box.hidden{display:none}
.svg-chart-container{width:100%;margin-top:8px}
.svg-chart-container svg{max-width:100%;height:auto}