:root{--primary-color:#4361ee;--secondary-color:#3a0ca3;--accent-color:#7209b7;--light-color:#f8f9fa;--dark-color:#212529;--gray-color:#6c757d;--success-color:#4cc9f0;--warning-color:#f72585;--clock-face:#ffffff;--clock-border:#333;--hand-hour:var(--dark-color);--hand-min:var(--gray-color);--hand-sec:var(--warning-color);--border-radius:12px;--box-shadow:0 8px 24px rgba(0,0,0,0.1);--transition:all 0.3s ease}*{margin:0;padding:0;box-sizing:border-box;font-family:'Segoe UI','Microsoft YaHei',sans-serif}body{background-color:#f0f2f5;color:var(--dark-color);line-height:1.6}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}header{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:white;padding:20px 0;box-shadow:0 4px 12px rgba(0,0,0,0.1);position:sticky;top:0;z-index:100}.header-content{display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:15px}.logo i{font-size:2.5rem}.logo h1{font-size:1.8rem;font-weight:700}.logo span{color:var(--success-color)}nav ul{display:flex;list-style:none;gap:25px}nav a{color:white;text-decoration:none;font-weight:600;font-size:1.1rem;padding:8px 12px;border-radius:6px;transition:var(--transition)}nav a:hover,nav a.active{background-color:rgba(255,255,255,0.2)}main{padding:40px 0}.section-title{font-size:1.8rem;margin-bottom:25px;color:var(--secondary-color);display:flex;align-items:center;gap:10px}.section-title i{color:var(--accent-color)}.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:25px;margin-bottom:40px}.tool-card{background:white;border-radius:var(--border-radius);padding:25px;box-shadow:var(--box-shadow);transition:var(--transition);cursor:pointer;border:2px solid transparent}.tool-card:hover{transform:translateY(-5px);border-color:var(--primary-color)}.tool-card i{font-size:2.5rem;color:var(--primary-color);margin-bottom:15px}.tool-card h3{font-size:1.4rem;margin-bottom:10px;color:var(--dark-color)}.tool-card p{color:var(--gray-color);margin-bottom:20px}.use-tool-btn{background-color:var(--primary-color);color:white;border:none;padding:10px 20px;border-radius:6px;font-weight:600;cursor:pointer;transition:var(--transition);width:100%}.use-tool-btn:hover{background-color:var(--secondary-color)}.tool-detail{background:white;border-radius:var(--border-radius);padding:30px;box-shadow:var(--box-shadow);margin-top:30px;display:none}.tool-detail.active{display:block}.tool-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px;padding-bottom:15px;border-bottom:2px solid #f0f2f5}.tool-header h2{font-size:1.6rem;color:var(--secondary-color)}.close-tool{background:none;border:none;font-size:1.5rem;color:var(--gray-color);cursor:pointer;transition:var(--transition)}.close-tool:hover{color:var(--warning-color)}.clock-wrapper{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}.main-clock-section{display:flex;flex-direction:column;align-items:center;gap:20px}.analog-clock{width:280px;height:280px;border:8px solid var(--dark-color);border-radius:50%;position:relative;background:var(--clock-face);box-shadow:inset 0 0 20px rgba(0,0,0,0.1),0 10px 20px rgba(0,0,0,0.15)}.clock-center{position:absolute;top:50%;left:50%;width:12px;height:12px;background:var(--dark-color);border-radius:50%;transform:translate(-50%,-50%);z-index:10}.hand{position:absolute;bottom:50%;left:50%;transform-origin:bottom center;border-radius:4px;z-index:5;transition:transform 0.05s cubic-bezier(0.4,2.3,0.3,1)}.hand.hour{width:8px;height:70px;background:var(--hand-hour)}.hand.min{width:4px;height:100px;background:var(--hand-min);z-index:6}.hand.sec{width:2px;height:110px;background:var(--hand-sec);z-index:7;transition:transform 0.2s cubic-bezier(0.4,0.0,0.2,1)}.marker{position:absolute;width:4px;height:15px;background:#ccc;left:50%;top:10px;transform-origin:50% 130px;transform:translateX(-50%)}.marker.main{width:6px;height:20px;background:#333}.digital-clock-container{text-align:center;width:100%}.digital-time{font-size:3.5rem;font-weight:700;color:var(--primary-color);font-family:'Consolas',monospace;letter-spacing:2px;line-height:1}.date-display{font-size:1.4rem;color:var(--gray-color);margin-top:10px;font-weight:500}.world-clocks-section{background:#f8f9fa;border-radius:var(--border-radius);padding:20px}.world-list-title{font-size:1.2rem;color:var(--secondary-color);margin-bottom:15px;padding-bottom:10px;border-bottom:2px solid #e0e0e0;display:flex;align-items:center;gap:8px}.world-item{display:flex;justify-content:space-between;align-items:center;padding:12px 10px;border-bottom:1px solid #eee;transition:var(--transition)}.world-item:hover{background:white;border-radius:6px;box-shadow:0 2px 5px rgba(0,0,0,0.05)}.world-item:last-child{border-bottom:none}.city-name{font-weight:600;color:var(--dark-color)}.city-zone{font-size:0.8rem;color:var(--gray-color);margin-left:5px}.city-time{font-family:'Consolas',monospace;font-size:1.1rem;color:var(--primary-color);font-weight:600}.timestamp-bar{margin-top:30px;background:#333;color:white;padding:15px 20px;border-radius:8px;display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:15px}.ts-item{display:flex;flex-direction:column;gap:5px}.ts-label{font-size:0.8rem;color:#aaa;text-transform:uppercase}.ts-value{font-family:'Consolas',monospace;font-size:1.1rem;color:var(--success-color)}.copy-ts-btn{background:rgba(255,255,255,0.1);color:white;border:1px solid rgba(255,255,255,0.2);padding:5px 10px;border-radius:4px;cursor:pointer;font-size:0.8rem;transition:var(--transition)}.copy-ts-btn:hover{background:var(--primary-color);border-color:var(--primary-color)}@media (max-width:768px){.clock-wrapper{grid-template-columns:1fr}.digital-time{font-size:2.5rem}.analog-clock{width:220px;height:220px}}