:root{--primary-color:#4A90E2;--secondary-color:#F39C12;--background-color:#F5F7FA;--surface-color:#FFF;--text-primary:#2C3E50;--text-secondary:#7F8C8D;--border-color:#E0E6ED;--shadow-light:0 2px 8px rgba(0,0,0,0.08);--shadow-medium:0 4px 16px rgba(0,0,0,0.12);--shadow-heavy:0 8px 32px rgba(0,0,0,0.16);--gradient-primary:linear-gradient(135deg,#667eea 0,#764ba2 100%);--gradient-warm:linear-gradient(135deg,#f093fb 0,#f5576c 100%);--gradient-cool:linear-gradient(135deg,#4facfe 0,#00f2fe 100%)}.dynamic-color-bar{will-change:background-position}.icon-btn:hover,.tab-btn:hover,.city-item:hover{will-change:transform}.chart-container{contain:layout style paint}.weather-header,.current-weather,.air-quality-section{contain:layout}body.dark-mode{--background-color:#1A1D2E;--surface-color:#252A3D;--text-primary:#E8EAED;--text-secondary:#9AA0A6;--border-color:#3A3F52;--shadow-light:0 2px 8px rgba(0,0,0,0.3);--shadow-medium:0 4px 16px rgba(0,0,0,0.4);--shadow-heavy:0 8px 32px rgba(0,0,0,0.5)}body.theme-ocean{--primary-color:#0077BE;--gradient-primary:linear-gradient(135deg,#4facfe 0,#00f2fe 100%);--background-color:#E0F7FA;--surface-color:#FFF}body.theme-forest{--primary-color:#2E7D32;--gradient-primary:linear-gradient(135deg,#56ab2f 0,#a8e063 100%);--background-color:#E8F5E9;--surface-color:#FFF}body.theme-sunset{--primary-color:#FF6B6B;--gradient-primary:linear-gradient(135deg,#f093fb 0,#f5576c 100%);--background-color:#FFF3E0;--surface-color:#FFF}body.theme-purple-dream{--primary-color:#7B2CBF;--gradient-primary:linear-gradient(135deg,#a8c0ff 0,#3f2b96 100%);--background-color:#F3E5F5;--surface-color:#FFF}body.theme-rose-gold{--primary-color:#B76E79;--gradient-primary:linear-gradient(135deg,#fbc2eb 0,#a6c1ee 100%);--background-color:#FCE4EC;--surface-color:#FFF}body.theme-midnight-blue{--primary-color:#1A237E;--gradient-primary:linear-gradient(135deg,#667eea 0,#764ba2 100%);--background-color:#E8EAF6;--surface-color:#FFF}body.theme-emerald{--primary-color:#00796B;--gradient-primary:linear-gradient(135deg,#11998e 0,#38ef7d 100%);--background-color:#E0F2F1;--surface-color:#FFF}body.theme-amber{--primary-color:#FF8F00;--gradient-primary:linear-gradient(135deg,#f7971e 0,#ffd200 100%);--background-color:#FFF8E1;--surface-color:#FFF}body.theme-cyan{--primary-color:#0097A7;--gradient-primary:linear-gradient(135deg,#89f7fe 0,#66a6ff 100%);--background-color:#E0F7FA;--surface-color:#FFF}body.theme-cherry-blossom{--primary-color:#EC407A;--gradient-primary:linear-gradient(135deg,#ffecd2 0,#fcb69f 100%);--background-color:#FCE4EC;--surface-color:#FFF}body.font-size-small{font-size:14px}body.font-size-small .temperature{font-size:72px}body.font-size-small .weather-icon{font-size:48px}body.font-size-large{font-size:18px}body.font-size-large .temperature{font-size:120px}body.font-size-large .weather-icon{font-size:80px}#weather-container{width:100%;min-height:100vh;background:var(--background-color);color:var(--text-primary);position:relative;overflow-x:hidden;transition:all 0.3s ease}.dynamic-color-bar{position:absolute;top:0;left:0;right:0;height:4px;background:var(--gradient-primary);animation:slideGradient 3s ease-in-out infinite;z-index:10}@keyframes slideGradient{0%,100%{background-position:0 50%}50%{background-position:100% 50%}}.weather-header{display:flex;justify-content:space-between;align-items:center;padding:20px 30px;background:var(--surface-color);border-bottom:1px solid var(--border-color);box-shadow:var(--shadow-light)}.header-left{display:flex;align-items:center;gap:20px}.city-selector .city-btn{display:flex;align-items:center;gap:8px;padding:8px 16px;background:var(--surface-color);color:var(--text-primary);border:none;border-radius:20px;font-size:14px;font-weight:500;cursor:pointer;transition:all 0.3s ease;box-shadow:var(--shadow-light);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:150px;opacity:0.85}.city-btn:hover{opacity:1;box-shadow:var(--shadow-medium)}.city-btn:active{transform:translateY(0)}.location-info{display:flex;align-items:center;gap:6px;padding:5px 12px;background:var(--surface-color);border-radius:16px;border:none;margin-left:8px;max-width:200px;opacity:0.75;transition:opacity 0.3s ease}.location-info:hover{opacity:1}.location-icon{font-size:13px;opacity:0.7}.location-text{font-size:11px;color:var(--text-secondary);font-weight:400;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.current-date{font-size:14px;color:var(--text-secondary)}.header-right{display:flex;align-items:center;gap:15px}.update-time{font-size:12px;color:var(--text-secondary);opacity:0.7;white-space:nowrap}.theme-select,.font-size-select{padding:6px 12px;border:1px solid var(--border-color);border-radius:20px;background:var(--surface-color);color:var(--text-primary);font-size:13px;cursor:pointer;transition:all 0.3s ease}.theme-select:hover,.font-size-select:hover{border-color:var(--primary-color);box-shadow:0 0 0 3px rgba(74,144,226,0.1)}.theme-select:focus,.font-size-select:focus{outline:none;border-color:var(--primary-color)}.icon-btn{width:36px;height:36px;border:none;background:linear-gradient(135deg,var(--surface-color) 0,rgba(74,144,226,0.05) 100%);color:var(--text-primary);border-radius:50%;cursor:pointer;transition:all 0.3s cubic-bezier(0.4,0,0.2,1);display:flex;align-items:center;justify-content:center;font-size:18px;border:1px solid var(--border-color);box-shadow:0 2px 6px rgba(0,0,0,0.08)}.icon-btn:hover{background:var(--gradient-primary);color:white;transform:translateY(-2px) rotate(15deg) scale(1.1);box-shadow:0 4px 12px rgba(74,144,226,0.25);border-color:transparent}.icon-btn:active{transform:translateY(0) rotate(0deg) scale(1)}.current-weather{padding:25px 30px;background:linear-gradient(135deg,var(--surface-color) 0,rgba(74,144,226,0.05) 100%);margin:20px;border-radius:20px;box-shadow:var(--shadow-medium);position:relative;overflow:hidden}.current-weather::before{content:'';position:absolute;top:-50%;right:-10%;width:300px;height:300px;background:radial-gradient(circle,rgba(74,144,226,0.1) 0,transparent 70%);border-radius:50%;pointer-events:none}.weather-main{display:flex;align-items:center;justify-content:center;gap:40px;margin-bottom:20px}.temperature-display{display:flex;align-items:flex-start}.temperature{font-size:96px;font-weight:200;line-height:1;background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.temp-unit{font-size:32px;color:var(--text-secondary);margin-top:10px}.weather-status{text-align:center}.weather-icon{font-size:64px;margin-bottom:10px;filter:drop-shadow(0 4px 8px rgba(0,0,0,0.1))}.weather-desc{font-size:24px;font-weight:500;color:var(--text-primary)}.weather-details{display:flex;justify-content:center;gap:20px;padding:12px 20px;background:rgba(74,144,226,0.05);border-radius:16px;margin-bottom:15px}.detail-item{display:flex;align-items:center;gap:6px;padding:6px 14px;background:var(--surface-color);border-radius:12px;transition:all 0.3s ease;border:1px solid rgba(74,144,226,0.1)}.detail-item:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(74,144,226,0.15);border-color:var(--primary-color)}.detail-icon{font-size:18px}.detail-label{font-size:12px;color:var(--text-secondary);font-weight:500}.detail-value{font-size:14px;font-weight:600;background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.temp-range{display:flex;justify-content:center;align-items:center;gap:12px;padding:10px 20px;background:linear-gradient(135deg,rgba(243,156,18,0.08) 0,rgba(231,76,60,0.08) 100%);border-radius:12px;border:1px solid rgba(243,156,18,0.2)}.range-label{font-size:13px;color:var(--text-secondary);font-weight:500}.range-value{font-size:15px;font-weight:600;background:linear-gradient(135deg,#f39c12 0,#e74c3c 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.air-quality-section{padding:18px 30px;margin:0 20px 20px;background:linear-gradient(135deg,var(--surface-color) 0,rgba(39,174,96,0.05) 100%);border-radius:20px;box-shadow:var(--shadow-medium);position:relative;overflow:hidden}.air-quality-section::before{content:'';position:absolute;bottom:-30%;left:-5%;width:200px;height:200px;background:radial-gradient(circle,rgba(39,174,96,0.08) 0,transparent 70%);border-radius:50%;pointer-events:none}.section-title{font-size:15px;font-weight:600;color:var(--text-primary);margin-bottom:15px;background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.aqi-display{display:flex;align-items:center;gap:25px}.aqi-value-container{display:flex;flex-direction:column;align-items:center;gap:5px;min-width:100px}.aqi-value{font-size:42px;font-weight:700;background:linear-gradient(135deg,#27AE60 0,#2ECC71 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.aqi-level{font-size:12px;padding:3px 10px;border-radius:12px;background:linear-gradient(135deg,#27AE60 0,#2ECC71 100%);color:white;font-weight:600}.aqi-bar-container{flex:1;height:32px;background:rgba(0,0,0,0.05);border-radius:16px;overflow:hidden;position:relative;border:1px solid rgba(39,174,96,0.1)}.aqi-bar{height:100%;background:linear-gradient(90deg,#27AE60 0,#F39C12 50%,#E74C3C 100%);border-radius:16px;transition:width 1s ease;position:relative;box-shadow:inset 0 2px 4px rgba(255,255,255,0.3)}.aqi-bar::after{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.3),transparent);animation:shimmer 2s infinite}@keyframes shimmer{0%{transform:translateX(-100%)}100%{transform:translateX(100%)}}.weather-tabs{display:flex;align-items:center;justify-content:space-between;margin:0 20px 0;padding:0 0 15px 0;gap:15px}.tabs-wrapper{display:inline-flex;background:var(--surface-color);border-radius:12px;padding:4px;position:relative;overflow:hidden}.tabs-wrapper::after{content:'';position:absolute;top:4px;bottom:4px;left:4px;width:calc(50% - 4px);background:linear-gradient(135deg,#4A90E2 0,#5BA3F5 50%,#357ABD 100%);border-radius:8px;transition:transform 0.3s cubic-bezier(0.4,0,0.2,1);z-index:0;box-shadow:0 2px 8px rgba(74,144,226,0.3)}.tabs-wrapper:has(.tab-btn[data-tab="7d"].active)::after{transform:translateX(calc(100% + 4px))}.tab-btn{padding:9px 24px;background:transparent;border:none;border-radius:8px;font-size:13px;font-weight:600;color:var(--text-secondary);cursor:pointer;transition:color 0.3s ease;position:relative;user-select:none;white-space:nowrap;z-index:1;min-width:110px;text-align:center}.tab-btn:hover{color:var(--text-primary)}.tab-btn.active{color:white}.refresh-btn{padding:0;background:var(--surface-color);border:none;border-radius:10px;color:var(--text-primary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all 0.3s ease;box-shadow:var(--shadow-light);opacity:0.85;width:32px;height:32px;flex-shrink:0}.refresh-btn:hover{opacity:1;box-shadow:var(--shadow-medium);transform:scale(1.05)}.refresh-btn:active{transform:scale(0.95)}.refresh-icon{display:inline-block;font-size:14px;transition:transform 0.5s ease}.refresh-btn:hover .refresh-icon{transform:rotate(180deg)}.chart-container{margin:0 20px 20px;background:var(--surface-color);border-radius:20px;padding:20px 15px;box-shadow:var(--shadow-medium);min-height:400px;position:relative;overflow:hidden;transition:all 0.3s ease}.chart-container:hover{box-shadow:var(--shadow-heavy)}.chart-container::before{content:'';position:absolute;top:-50%;right:-20%;width:400px;height:400px;background:radial-gradient(circle,rgba(74,144,226,0.05) 0,transparent 70%);border-radius:50%;pointer-events:none;transition:all 0.5s ease}.chart-container:hover::before{transform:scale(1.1);opacity:0.8}.tab-content{display:none;animation:fadeIn 0.4s cubic-bezier(0.4,0,0.2,1)}.tab-content.active{display:block;animation:fadeIn 0.4s cubic-bezier(0.4,0,0.2,1)}#chart24h,#chart7d{width:100% !important;height:450px !important;position:relative;transition:height 0.3s ease}.chart-indicators{position:absolute;top:8px;right:10px;display:flex;gap:8px;z-index:100}.wind-indicator{font-size:10px;background:rgba(255,255,255,0.95);padding:4px 10px;border-radius:6px;border:1px solid rgba(0,0,0,0.08);box-shadow:0 2px 6px rgba(0,0,0,0.08);font-weight:500;color:rgba(0,0,0,0.65);backdrop-filter:blur(4px);transition:all 0.3s ease}.wind-indicator:hover,.aqi-indicator:hover{transform:translateY(-1px);box-shadow:0 4px 8px rgba(0,0,0,0.12)}body.dark-mode .wind-indicator,body.dark-mode .aqi-indicator{background:rgba(37,42,61,0.95);border-color:rgba(255,255,255,0.15);color:rgba(255,255,255,0.7);box-shadow:0 2px 6px rgba(0,0,0,0.3)}body.dark-mode .wind-indicator:hover,body.dark-mode .aqi-indicator:hover{box-shadow:0 4px 8px rgba(0,0,0,0.4)}.aqi-indicator{font-size:10px;background:rgba(255,255,255,0.95);padding:4px 10px;border-radius:6px;border:1px solid rgba(0,0,0,0.08);box-shadow:0 2px 6px rgba(0,0,0,0.08);font-weight:500;color:rgba(0,0,0,0.65);backdrop-filter:blur(4px);transition:all 0.3s ease;cursor:help}.wind-row{position:absolute;bottom:2px;left:0;right:0;display:flex;align-items:center;z-index:100}.wind-axis-label{padding:2px 10px;font-size:9px;color:var(--text-secondary);font-weight:500;opacity:0.7;white-space:nowrap}.wind-labels{flex:1;display:flex;justify-content:space-between;padding-left:8%;padding-right:5%}.wind-labels span{flex:1;text-align:center;font-size:9px;color:var(--text-secondary);font-weight:400;padding:2px 1px;margin:0 0.5px;background:var(--background-color);border-radius:2px;opacity:0.5;transition:opacity 0.3s ease}.wind-labels span:hover{opacity:0.8}.chart-container:hover .wind-labels{opacity:0.7}.weather-icons{position:absolute;top:45%;left:5%;right:5%;display:flex;justify-content:space-around;pointer-events:none;z-index:10}.weather-icons > div{text-align:center;flex:1;transition:transform 0.3s ease}.weather-icons > div:hover{transform:scale(1.15)}.weather-indicators{display:grid;grid-template-columns:repeat(5,1fr);gap:15px;padding:0 20px 30px}.indicator-card{display:flex;align-items:center;gap:15px;padding:20px;background:linear-gradient(135deg,var(--surface-color) 0,rgba(74,144,226,0.03) 100%);border-radius:16px;box-shadow:var(--shadow-light);transition:all 0.3s ease;border:1px solid rgba(74,144,226,0.08);position:relative;overflow:hidden}.indicator-card::before{content:'';position:absolute;top:0;left:0;width:4px;height:100%;background:var(--gradient-primary);opacity:0;transition:opacity 0.3s ease}.indicator-card:hover::before{opacity:1}.indicator-card:hover{transform:translateY(-5px) scale(1.02);box-shadow:var(--shadow-medium);border-color:rgba(74,144,226,0.2)}.card-icon{font-size:36px}.card-content{flex:1}.card-label{font-size:12px;color:var(--text-secondary);margin-bottom:5px}.card-value{font-size:16px;font-weight:600;color:var(--text-primary)}.modal{position:fixed;top:0;left:0;right:0;bottom:0;z-index:100001;display:flex;align-items:center;justify-content:center}.modal-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,0.5);backdrop-filter:blur(8px)}.modal-content{position:relative;background:var(--surface-color);border-radius:20px;box-shadow:var(--shadow-heavy);max-width:600px;width:90%;max-height:80vh;overflow:hidden;animation:modalSlideIn 0.3s ease}@keyframes modalSlideIn{from{opacity:0;transform:translateY(-50px)}to{opacity:1;transform:translateY(0)}}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:20px 30px;border-bottom:1px solid var(--border-color)}.modal-header h3{font-size:20px;font-weight:600;color:var(--text-primary);margin:0}.close-btn{width:32px;height:32px;border:none;background:var(--background-color);color:var(--text-primary);border-radius:50%;font-size:24px;cursor:pointer;transition:all 0.3s ease}.close-btn:hover{background:#E74C3C;color:white;transform:rotate(90deg)}.modal-body{padding:15px 20px 20px;max-height:calc(80vh - 80px);overflow-y:auto;overflow-x:hidden}.city-search{margin-bottom:15px}.city-search input{width:100%;padding:12px 16px;border:2px solid var(--border-color);border-radius:12px;font-size:14px;background:var(--background-color);color:var(--text-primary);transition:all 0.3s ease;box-sizing:border-box}.city-search input::placeholder{color:var(--text-secondary);opacity:0.6}.city-search input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px rgba(74,144,226,0.1);background:var(--surface-color)}.city-list{display:flex;flex-direction:column;gap:20px;max-height:480px;overflow-y:auto;padding-right:5px}.city-section{animation:fadeIn 0.3s ease}.city-section-title{font-size:13px;font-weight:600;color:var(--text-secondary);padding:8px 12px;background:linear-gradient(135deg,rgba(74,144,226,0.08) 0,rgba(74,144,226,0.03) 100%);border-radius:10px;margin-bottom:10px;display:flex;align-items:center;gap:6px;position:sticky;top:0;z-index:10;backdrop-filter:blur(10px);border:1px solid rgba(74,144,226,0.1)}.city-section-content{display:grid;grid-template-columns:repeat(auto-fill,minmax(90px,1fr));gap:8px}.city-item{padding:10px 8px;background:var(--background-color);border:2px solid transparent;border-radius:10px;text-align:center;cursor:pointer;transition:all 0.25s cubic-bezier(0.4,0,0.2,1);font-size:13px;color:var(--text-primary);position:relative;overflow:hidden}.city-item::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(74,144,226,0.1),transparent);transition:left 0.5s ease}.city-item:hover::before{left:100%}.city-item:hover{border-color:var(--primary-color);background:var(--surface-color);transform:translateY(-3px) scale(1.05);box-shadow:0 4px 12px rgba(74,144,226,0.2)}.city-item.active{background:var(--gradient-primary);color:white;border-color:transparent;box-shadow:0 4px 12px rgba(74,144,226,0.3);font-weight:600}.city-item.active::after{content:'✓';position:absolute;top:2px;right:4px;font-size:10px;opacity:0.8}.city-item.keyboard-selected{border-color:var(--primary-color);background:var(--surface-color);box-shadow:0 0 0 3px rgba(74,144,226,0.2);transform:translateY(-2px) scale(1.03)}.city-no-result{text-align:center;padding:60px 20px;color:var(--text-secondary);animation:fadeIn 0.3s ease}.city-tips{margin-top:15px;padding:12px;text-align:center;color:var(--text-secondary);font-size:12px;background:linear-gradient(135deg,rgba(74,144,226,0.05) 0,rgba(74,144,226,0.02) 100%);border-radius:10px;border:1px solid rgba(74,144,226,0.08)}.shortcuts-list{display:flex;flex-direction:column;gap:15px}.shortcut-item{display:flex;justify-content:space-between;align-items:center;padding:15px 20px;background:var(--background-color);border-radius:12px}.shortcut-key{padding:6px 12px;background:var(--gradient-primary);color:white;border-radius:8px;font-weight:600;font-size:14px}.shortcut-desc{color:var(--text-primary);font-size:14px}body.fullscreen-mode{overflow:hidden}body.fullscreen-mode #weather-container{position:fixed;top:0;left:0;right:0;bottom:0;z-index:9999}@media (max-width:768px){.weather-header{padding:15px 15px}.header-left{flex-wrap:wrap;gap:10px}.current-weather{margin:15px 10px;padding:20px 15px}.weather-main{flex-direction:column;gap:15px}.temperature{font-size:72px}.weather-details{grid-template-columns:repeat(3,1fr);gap:10px}.air-quality-section{margin:0 10px 15px;padding:15px 15px}.chart-container{margin:0 10px 15px;padding:15px 10px}#chart24h,#chart7d{height:380px !important}.weather-indicators{grid-template-columns:repeat(2,1fr);margin:0 10px}.indicator-card{padding:15px}.chart-indicators{right:5px;gap:5px}.wind-indicator,.aqi-indicator{font-size:9px;padding:3px 7px}}@media (max-width:480px){.weather-header{padding:12px 10px}.city-btn{padding:8px 14px;font-size:14px}.location-info{padding:4px 10px;font-size:11px}.current-weather{margin:10px 8px;padding:18px 12px}.temperature{font-size:56px}.temp-unit{font-size:24px}.weather-icon{font-size:48px}.weather-desc{font-size:16px}.weather-details{grid-template-columns:repeat(3,1fr);gap:8px;font-size:11px}.air-quality-section{margin:0 8px 12px;padding:12px 10px}.aqi-value{font-size:32px}.chart-container{margin:0 8px 12px;padding:12px 8px}#chart24h,#chart7d{height:320px !important}.weather-tabs{padding:10px 8px;flex-wrap:wrap}.tab-btn{padding:8px 12px;font-size:13px}.weather-indicators{grid-template-columns:1fr;gap:10px;margin:0 8px}.indicator-card{padding:12px}.city-list{grid-template-columns:repeat(auto-fill,minmax(90px,1fr));gap:8px}.chart-indicators{right:3px;gap:4px;flex-direction:column;align-items:flex-end}.wind-indicator,.aqi-indicator{font-size:8px;padding:2px 6px}.wind-labels{font-size:8px}}@keyframes fadeIn{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.current-weather,.air-quality-section,.chart-container,.indicator-card{animation:fadeIn 0.5s ease}.loading{display:inline-block;width:20px;height:20px;border:3px solid rgba(74,144,226,0.3);border-radius:50%;border-top-color:var(--primary-color);animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}