:root{--primary: #646cff;--primary-hover: #535bf2;--bg: #f5f5f7;--bg-card: #ffffff;--text: #1d1d1f;--text-secondary: #6e6e73;--border: #e5e5ea;--success: #52c41a;--warning: #faad14;--error: #ff4d4f;--radius: 12px;--shadow: 0 2px 8px rgba(0, 0, 0, .06);--shadow-hover: 0 8px 24px rgba(0, 0, 0, .12)}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}a{color:var(--primary);text-decoration:none}a:hover{color:var(--primary-hover)}button{font-family:inherit;cursor:pointer;border:none;border-radius:8px;padding:10px 20px;font-size:14px;font-weight:500;background:var(--primary);color:#fff;transition:all .2s}button:hover:not(:disabled){background:var(--primary-hover);transform:translateY(-1px)}button:disabled{opacity:.5;cursor:not-allowed}button.btn-secondary{background:#f0f0f0;color:var(--text)}button.btn-secondary:hover:not(:disabled){background:#e0e0e0}button.btn-primary{background:var(--primary);color:#fff}input,textarea,select{font-family:inherit;font-size:14px;padding:10px 12px;border:1px solid var(--border);border-radius:8px;background:#fff;color:var(--text);width:100%;transition:border-color .2s}input:focus,textarea:focus,select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #646cff1a}textarea{resize:vertical;min-height:120px;font-family:SF Mono,Monaco,Consolas,monospace;line-height:1.5}input[type=range]{padding:0;border:none;background:transparent}input[type=color]{padding:2px;height:40px;cursor:pointer}input[type=checkbox]{width:16px;height:16px;margin-right:8px;vertical-align:middle}.app{min-height:100vh;display:flex;flex-direction:column}.header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.header-inner{max-width:1200px;margin:0 auto;padding:16px 24px;display:flex;justify-content:space-between;align-items:center}.logo{font-size:20px;font-weight:700;color:var(--text)}.logo:hover{color:var(--primary)}.nav{display:flex;gap:24px}.nav a{color:var(--text-secondary);font-weight:500}.nav a:hover{color:var(--primary)}.main{flex:1;max-width:1200px;margin:0 auto;padding:32px 24px;width:100%}.footer{background:#fff;border-top:1px solid var(--border);padding:24px;text-align:center;color:var(--text-secondary);font-size:14px}.footer-inner p{margin:4px 0}.hero{text-align:center;padding:48px 0 32px}.hero h1{font-size:40px;font-weight:700;margin:0 0 16px;background:linear-gradient(135deg,var(--primary),#9b8cff);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero p{font-size:18px;color:var(--text-secondary);margin:0 0 24px}.hero-stats{display:flex;justify-content:center;gap:24px;flex-wrap:wrap;color:var(--text-secondary)}.tools-section,.features,.faq{margin-top:48px}.tools-section h2,.features h2,.faq h2{font-size:24px;font-weight:600;margin:0 0 24px}.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}.tool-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;transition:all .3s;display:block;color:var(--text)}.tool-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:var(--primary)}.tool-icon{font-size:32px;margin-bottom:12px;font-weight:700;color:var(--primary)}.tool-card h3{font-size:18px;font-weight:600;margin:0 0 8px}.tool-card p{color:var(--text-secondary);font-size:14px;margin:0 0 12px}.tool-category{display:inline-block;font-size:12px;color:var(--primary);background:#646cff1a;padding:4px 10px;border-radius:12px}.features-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px}.feature-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;text-align:center}.feature-icon{font-size:36px;margin-bottom:12px}.feature-item h3{font-size:16px;font-weight:600;margin:0 0 8px}.feature-item p{color:var(--text-secondary);font-size:14px;margin:0}.faq details{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:16px 20px;margin-bottom:12px}.faq summary{font-weight:600;cursor:pointer;padding:4px 0}.faq details p{color:var(--text-secondary);margin:12px 0 0}.tool-page{max-width:1000px;margin:0 auto}.tool-header{margin-bottom:24px}.back-link{display:inline-block;color:var(--text-secondary);font-size:14px;margin-bottom:12px}.back-link:hover{color:var(--primary)}.tool-header h1{font-size:28px;font-weight:700;margin:0 0 8px}.tool-header p{color:var(--text-secondary);margin:0}.tool-content{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px}.tool-actions{display:flex;gap:12px;margin-bottom:20px;flex-wrap:wrap;align-items:center}.indent-label{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text-secondary)}.indent-label select{width:auto;padding:6px 10px}.tool-editor{display:grid;grid-template-columns:1fr 1fr;gap:16px}.editor-panel{display:flex;flex-direction:column}.editor-header{font-size:13px;font-weight:600;color:var(--text-secondary);margin-bottom:8px;text-transform:uppercase;letter-spacing:.5px}.editor-panel textarea{min-height:300px}.error-msg{margin-top:16px;padding:12px 16px;background:#ff4d4f1a;border:1px solid var(--error);border-radius:8px;color:var(--error);font-size:14px}.form-group{margin-bottom:16px}.form-group label{display:block;font-size:14px;font-weight:500;margin-bottom:8px;color:var(--text)}.form-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:16px}.input-with-copy{display:flex;gap:8px}.input-with-copy input{flex:1}.input-with-copy button{flex-shrink:0}.rgb-inputs{display:flex;gap:8px;align-items:center}.rgb-inputs input{flex:1;min-width:60px}.checkbox-group{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;margin-bottom:16px}.checkbox-group label{display:flex;align-items:center;font-size:14px;cursor:pointer;padding:8px 12px;background:#f9f9f9;border-radius:8px}.qr-tool{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:start}.qr-preview{display:flex;flex-direction:column;align-items:center;gap:16px}.qr-preview canvas{border:1px solid var(--border);border-radius:8px;max-width:100%;height:auto}.char-counter textarea{min-height:200px;margin-bottom:20px}.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:12px;margin-bottom:20px}.stat-item{background:#f9f9f9;border-radius:8px;padding:16px;text-align:center}.stat-value{display:block;font-size:24px;font-weight:700;color:var(--primary)}.stat-label{display:block;font-size:12px;color:var(--text-secondary);margin-top:4px}.color-converter{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:start}.color-preview{height:200px;border-radius:var(--radius);display:flex;align-items:center;justify-content:center;font-size:24px;font-weight:700;color:#fff;text-shadow:0 1px 2px rgba(0,0,0,.3);border:1px solid var(--border)}.color-inputs .form-group{margin-bottom:16px}.timestamp-tool{max-width:600px}.current-time{background:linear-gradient(135deg,var(--primary),#9b8cff);color:#fff;padding:20px;border-radius:var(--radius);margin-bottom:24px;text-align:center}.current-time h3{margin:0 0 8px;font-size:14px;opacity:.9}.current-time-value{display:flex;justify-content:center;gap:24px;flex-wrap:wrap;font-family:SF Mono,Monaco,Consolas,monospace;font-size:16px}.converter-section{display:flex;flex-direction:column;gap:12px}.converter-section button{align-self:flex-start}.tips{margin-top:20px;padding:12px 16px;background:#646cff14;border-radius:8px;font-size:14px;color:var(--text-secondary)}.tips p{margin:0}.password-tool{max-width:600px}.password-display{display:flex;gap:8px;margin-bottom:12px}.password-display input{flex:1;font-family:SF Mono,Monaco,Consolas,monospace;font-size:16px;padding:14px}.password-strength{margin-bottom:20px;font-size:14px;color:var(--text-secondary)}.password-options .form-group,.text-diff .tool-editor{margin-bottom:16px}.diff-result{margin-top:20px}.diff-stats{display:flex;gap:16px;margin-bottom:12px;font-size:14px}.stat-add{color:var(--success);font-weight:600}.stat-del{color:var(--error);font-weight:600}.stat-same{color:var(--text-secondary)}.diff-lines{background:#f9f9f9;border-radius:8px;overflow:hidden;max-height:500px;overflow-y:auto;font-family:SF Mono,Monaco,Consolas,monospace;font-size:13px}.diff-line{display:flex;padding:4px 12px;border-bottom:1px solid #eee}.diff-line:last-child{border-bottom:none}.diff-marker{width:20px;flex-shrink:0;font-weight:700}.diff-text{flex:1;white-space:pre-wrap;word-break:break-all}.diff-add{background:#52c41a1a}.diff-add .diff-marker{color:var(--success)}.diff-del{background:#ff4d4f1a}.diff-del .diff-marker{color:var(--error)}.diff-same{color:var(--text-secondary)}@media (max-width: 768px){.hero h1{font-size:28px}.hero p{font-size:16px}.tool-editor,.qr-tool,.color-converter{grid-template-columns:1fr}.header-inner{padding:12px 16px}.main{padding:20px 16px}.nav{gap:16px}.logo{font-size:16px}}