/* ============================================
   ToolNet · 全局样式 v2 — 统一渐变科技风
   ============================================ */
:root {
  --primary: #4f46e5; --primary-light: #818cf8; --accent: #06b6d4;
  --gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #06b6d4 100%);
  --bg: #f8fafc; --card-bg: #ffffff; --text: #1e293b; --text-secondary: #64748b;
  --border: #e2e8f0; --success: #10b981; --warning: #f59e0b; --error: #ef4444;
  --shadow: 0 2px 8px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-lg: 0 16px 32px rgba(79,70,229,.12);
  --radius: 16px; --radius-sm: 10px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}
a{color:var(--primary);text-decoration:none}

/* Nav */
.nav{background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:60px;display:flex;align-items:center;justify-content:space-between}
.nav .logo{font-size:1.25rem;font-weight:800;background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;display:flex;align-items:center;gap:8px}
.nav-links{display:flex;gap:4px}
.nav-links a{color:var(--text-secondary);padding:6px 14px;border-radius:8px;font-size:.85rem;font-weight:500;text-decoration:none;transition:all .2s}
.nav-links a:hover,.nav-links a.active{color:var(--primary);background:rgba(79,70,229,.06)}

/* Tool container */
.tool-container{max-width:800px;margin:40px auto 60px;padding:0 24px}
.tool-box{background:var(--card-bg);border-radius:var(--radius);padding:36px;box-shadow:var(--shadow);border:1px solid var(--border)}

/* Header stripe (tool pages) */
.page-stripe{background:var(--gradient);color:#fff;padding:40px 24px;text-align:center;position:relative;overflow:hidden}
.page-stripe::before{content:'';position:absolute;inset:0;background:radial-gradient(circle at 50% 50%,rgba(255,255,255,.08),transparent 70%)}
.page-stripe>*{position:relative}
.page-stripe h1{font-size:2rem;font-weight:800;margin-bottom:6px}
.page-stripe p{opacity:.85;font-size:1rem}

/* Forms */
.form-group{margin-bottom:20px}
label{display:block;font-size:.9rem;font-weight:600;margin-bottom:6px}
input[type=text],input[type=number],input[type=url],textarea,select{width:100%;padding:10px 14px;border:1.5px solid var(--border);border-radius:var(--radius-sm);font-size:.95rem;font-family:var(--font);transition:border-color .2s;outline:none;background:var(--bg);color:var(--text)}
input:focus,textarea:focus,select:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(79,70,229,.1)}
textarea{min-height:140px;resize:vertical}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 24px;border:none;border-radius:var(--radius-sm);font-size:.95rem;font-weight:600;font-family:var(--font);cursor:pointer;transition:all .2s}
.btn-primary{background:var(--gradient);color:#fff}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 8px 20px rgba(79,70,229,.25)}
.btn-secondary{background:var(--bg);color:var(--text);border:1px solid var(--border)}
.btn-secondary:hover{background:var(--border)}
.btn-success{background:var(--success);color:#fff}
.btn-sm{padding:6px 14px;font-size:.85rem}
.btn-block{width:100%;justify-content:center}

/* Output area */
.output-area{margin-top:24px;padding:20px;background:var(--bg);border-radius:var(--radius-sm);border:1px solid var(--border);min-height:60px}
.output-area.has-result{border-color:var(--success)}
.result-display{text-align:center;padding:16px}
.result-display img,.result-display canvas{max-width:100%;border-radius:var(--radius-sm)}

/* Stats grid */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:12px;margin-top:16px}
.stat-item{background:var(--card-bg);padding:16px;border-radius:var(--radius-sm);text-align:center;border:1px solid var(--border)}
.stat-item .stat-value{font-size:1.5rem;font-weight:800;color:var(--primary)}
.stat-item .stat-label{font-size:.8rem;color:var(--text-secondary);margin-top:4px}

/* Checkboxes */
.checkbox-group{display:flex;flex-wrap:wrap;gap:10px}
.checkbox-label{display:flex;align-items:center;gap:6px;font-size:.88rem;cursor:pointer;padding:6px 12px;border-radius:8px;border:1px solid var(--border);transition:all .2s;user-select:none}
.checkbox-label:hover{border-color:var(--primary);background:rgba(79,70,229,.03)}
.checkbox-label input[type=checkbox]{width:16px;height:16px;accent-color:var(--primary)}

/* Range */
input[type=range]{width:100%;height:6px;-webkit-appearance:none;appearance:none;background:var(--border);border-radius:3px;outline:none}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;border-radius:50%;background:var(--gradient);cursor:pointer}

/* Strength meter */
.strength-meter{height:6px;border-radius:3px;background:var(--border);margin-top:8px;overflow:hidden}
.strength-meter .bar{height:100%;border-radius:3px;transition:all .3s;width:0%}
.strength-meter .bar.weak{width:25%;background:var(--error)}
.strength-meter .bar.medium{width:50%;background:var(--warning)}
.strength-meter .bar.strong{width:75%;background:var(--accent)}
.strength-meter .bar.very-strong{width:100%;background:var(--success)}
.strength-label{font-size:.8rem;font-weight:600;margin-top:4px;color:var(--text-secondary)}

/* Toast */
.toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%) translateY(100px);background:var(--text);color:#fff;padding:12px 24px;border-radius:var(--radius-sm);font-size:.9rem;font-weight:500;opacity:0;transition:all .3s;z-index:200}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.toast.success{background:var(--success)}
.toast.error{background:var(--error)}

/* File drop */
.file-drop{border:2px dashed var(--border);border-radius:var(--radius);padding:40px 20px;text-align:center;cursor:pointer;transition:all .2s}
.file-drop:hover,.file-drop.dragover{border-color:var(--primary);background:rgba(79,70,229,.04)}
.file-drop .icon{font-size:2.5rem;margin-bottom:12px}
.file-drop p{color:var(--text-secondary);font-size:.9rem}
.file-drop .hint{font-size:.8rem;margin-top:4px;color:var(--text-secondary)}

/* Section header */
.section-label{font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:1.2px;color:#94a3b8;margin-bottom:20px}

/* JSON highlight */
.json-tree{text-align:left;font-family:'SF Mono','Fira Code',monospace;font-size:.85rem;line-height:1.7;white-space:pre-wrap;word-break:break-all}

/* Footer */
.footer{text-align:center;padding:32px 24px;color:var(--text-secondary);font-size:.85rem;border-top:1px solid var(--border)}

/* Subscribe strip */
.subscribe-strip{background:var(--gradient);color:#fff;text-align:center;padding:50px 24px;margin-top:60px}
.subscribe-strip h3{font-size:1.4rem;font-weight:800;margin-bottom:8px}
.subscribe-strip p{opacity:.85;margin-bottom:20px;font-size:.95rem}
.subscribe-strip .sub-form{display:flex;gap:10px;max-width:420px;margin:0 auto}
.subscribe-strip input{flex:1;padding:10px 16px;border:none;border-radius:10px;font-size:.95rem;font-family:var(--font);outline:none}
.subscribe-strip button{background:#1e293b;color:#fff;border:none;padding:10px 20px;border-radius:10px;font-size:.95rem;font-weight:600;cursor:pointer;transition:all .2s;font-family:var(--font)}
.subscribe-strip button:hover{background:#334155}

/* Responsive */
@media(max-width:768px){
 .tool-box{padding:24px 18px}
 .form-row{grid-template-columns:1fr}
 .nav-links a{font-size:.78rem;padding:4px 8px}
 .page-stripe h1{font-size:1.5rem}
 .subscribe-strip .sub-form{flex-direction:column}
 .tool-container{margin:24px auto 40px}
}
@media(max-width:480px){
 .tool-box{padding:16px 14px}
 .checkbox-group{flex-direction:column;gap:6px}
}