:root{--bg-primary: #f5f5fa;--bg-secondary: #eeeef5;--bg-card: rgba(255, 255, 255, .8);--bg-card-hover: rgba(255, 255, 255, .95);--bg-input: rgba(255, 255, 255, .9);--bg-glass: rgba(56, 189, 248, .05);--bg-header: rgba(245, 245, 250, .88);--text-primary: #1a1a2e;--text-secondary: #5a5a7a;--text-muted: #8a8aaa;--text-accent: #0ea5e9;--accent-primary: #38bdf8;--accent-secondary: #0ea5e9;--accent-glow: rgba(56, 189, 248, .2);--accent-gradient: linear-gradient(135deg, #0ea5e9, #67e8f9);--success: #059669;--warning: #d97706;--error: #dc2626;--border-subtle: rgba(0, 0, 0, .06);--border-card: rgba(0, 0, 0, .08);--border-focus: rgba(56, 189, 248, .5);--bg-decoration-1: rgba(56, 189, 248, .04);--bg-decoration-2: rgba(103, 232, 249, .03);--shadow-card: 0 4px 20px rgba(0, 0, 0, .06);--shadow-card-hover: 0 8px 40px rgba(56, 189, 248, .12);--shadow-glow: 0 0 30px rgba(56, 189, 248, .15);--btn-secondary-hover-bg: rgba(0, 0, 0, .04);--btn-secondary-hover-border: rgba(0, 0, 0, .12);--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: 1rem;--font-size-lg: 1.125rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.5rem;--font-size-3xl: 2rem;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 24px;--transition-fast: .15s ease;--transition-base: .25s ease;--transition-slow: .4s ease;--max-width: 1200px;--header-height: 64px}[data-theme=dark]{--bg-primary: #0f0f1a;--bg-secondary: #161625;--bg-card: rgba(30, 30, 52, .6);--bg-card-hover: rgba(40, 40, 72, .8);--bg-input: rgba(20, 20, 40, .8);--bg-glass: rgba(255, 255, 255, .04);--bg-header: rgba(15, 15, 26, .85);--text-primary: #e8e8f0;--text-secondary: #9494b8;--text-muted: #6a6a8e;--text-accent: #67e8f9;--accent-glow: rgba(56, 189, 248, .3);--success: #34d399;--warning: #fbbf24;--error: #f87171;--border-subtle: rgba(255, 255, 255, .06);--border-card: rgba(255, 255, 255, .08);--bg-decoration-1: rgba(56, 189, 248, .06);--bg-decoration-2: rgba(103, 232, 249, .04);--shadow-card: 0 4px 20px rgba(0, 0, 0, .3);--shadow-card-hover: 0 8px 40px rgba(56, 189, 248, .15);--shadow-glow: 0 0 30px rgba(56, 189, 248, .2);--btn-secondary-hover-bg: rgba(255, 255, 255, .08);--btn-secondary-hover-border: rgba(255, 255, 255, .15)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-family);background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh;overflow-x:hidden;transition:background-color var(--transition-base),color var(--transition-base)}body:before{content:"";position:fixed;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle at 20% 20%,var(--bg-decoration-1) 0%,transparent 50%),radial-gradient(circle at 80% 80%,var(--bg-decoration-2) 0%,transparent 50%);pointer-events:none;z-index:0}#app{position:relative;z-index:1;min-height:100vh;display:flex;flex-direction:column}a{color:var(--text-accent);text-decoration:none}.site-header{position:sticky;top:0;z-index:100;height:var(--header-height);display:flex;align-items:center;justify-content:space-between;padding:0 var(--space-8);background:var(--bg-header);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-bottom:1px solid var(--border-subtle);transition:background var(--transition-base)}.site-header__logo{display:flex;align-items:center;gap:var(--space-3);font-size:var(--font-size-xl);font-weight:700;color:var(--text-primary);cursor:pointer;transition:opacity var(--transition-fast)}.site-header__logo:hover{opacity:.85}.site-header__logo-icon{font-size:1.6rem}.site-header__logo-text{background:var(--accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.site-header__nav{display:flex;gap:var(--space-4);align-items:center}.site-header__link{color:var(--text-secondary);font-size:var(--font-size-sm);font-weight:500;transition:color var(--transition-fast)}.site-header__link:hover{color:var(--text-primary)}.lang-select{padding:var(--space-2) var(--space-3);font-size:var(--font-size-sm);font-family:var(--font-family);font-weight:500;color:var(--text-secondary);background:var(--bg-glass);border:1px solid var(--border-card);border-radius:var(--radius-md);cursor:pointer;outline:none;transition:all var(--transition-base);-moz-appearance:none;appearance:none;-webkit-appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239494b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 8px center;padding-right:var(--space-8)}.lang-select:hover{color:var(--text-primary);border-color:var(--btn-secondary-hover-border)}.lang-select:focus{border-color:var(--border-focus)}.lang-select option{background:var(--bg-primary);color:var(--text-primary)}.theme-toggle{display:flex;align-items:center;justify-content:center;width:38px;height:38px;border:1px solid var(--border-card);border-radius:var(--radius-md);background:var(--bg-glass);cursor:pointer;font-size:1.2rem;transition:all var(--transition-base);color:var(--text-secondary);line-height:1}.theme-toggle:hover{background:var(--btn-secondary-hover-bg);border-color:var(--btn-secondary-hover-border);color:var(--text-primary);transform:rotate(15deg)}.main-content{flex:1;max-width:var(--max-width);width:100%;margin:0 auto;padding:var(--space-8)}.home-hero{text-align:center;padding:var(--space-12) 0 var(--space-8)}.home-hero__title{font-size:var(--font-size-3xl);font-weight:700;margin-bottom:var(--space-3);background:linear-gradient(135deg,var(--text-primary),var(--text-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.home-hero__subtitle{font-size:var(--font-size-lg);color:var(--text-secondary);max-width:500px;margin:0 auto}.tag-filter{display:flex;flex-wrap:wrap;gap:var(--space-2);justify-content:center;padding:var(--space-6) 0}.tag-filter__btn{padding:var(--space-2) var(--space-5);font-size:var(--font-size-sm);font-family:var(--font-family);font-weight:500;color:var(--text-secondary);background:var(--bg-glass);border:1px solid var(--border-card);border-radius:var(--radius-xl);cursor:pointer;transition:all var(--transition-base)}.tag-filter__btn:hover{color:var(--text-primary);background:#38bdf81a;border-color:#38bdf84d}.tag-filter__btn--active{color:#fff;background:var(--accent-gradient);border-color:transparent;box-shadow:var(--shadow-glow)}.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:var(--space-6);padding:var(--space-4) 0}.tool-card{position:relative;background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius-lg);padding:var(--space-6);cursor:pointer;transition:all var(--transition-base);overflow:hidden}.tool-card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--accent-gradient);opacity:0;transition:opacity var(--transition-base)}.tool-card:hover{background:var(--bg-card-hover);border-color:#38bdf833;box-shadow:var(--shadow-card-hover);transform:translateY(-4px)}.tool-card:hover:before{opacity:1}.tool-card__icon{font-size:2.2rem;margin-bottom:var(--space-4);display:block}.tool-card__name{font-size:var(--font-size-lg);font-weight:600;color:var(--text-primary);margin-bottom:var(--space-2)}.tool-card__desc{font-size:var(--font-size-sm);color:var(--text-secondary);line-height:1.5;margin-bottom:var(--space-4)}.tool-card__tags{display:flex;flex-wrap:wrap;gap:var(--space-2)}.tool-card__tag{font-size:var(--font-size-xs);color:var(--text-muted);background:var(--bg-glass);padding:var(--space-1) var(--space-3);border-radius:var(--radius-sm);border:1px solid var(--border-subtle)}.tool-page{padding:var(--space-6) 0}.tool-page__header{margin-bottom:var(--space-8)}.tool-page__back{display:inline-flex;align-items:center;gap:var(--space-2);font-size:var(--font-size-sm);color:var(--text-secondary);font-family:var(--font-family);background:none;border:none;cursor:pointer;padding:var(--space-2) 0;margin-bottom:var(--space-4);transition:color var(--transition-fast)}.tool-page__back:hover{color:var(--text-accent)}.tool-page__title{font-size:var(--font-size-2xl);font-weight:700;margin-bottom:var(--space-2)}.tool-page__desc{font-size:var(--font-size-base);color:var(--text-secondary)}.converter-wrapper{display:grid;grid-template-columns:1fr auto 1fr;gap:var(--space-6);align-items:stretch}.converter-panel{display:flex;flex-direction:column;gap:var(--space-3)}.converter-panel__label{font-size:var(--font-size-sm);font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em}.converter-panel__textarea{flex:1;min-height:360px;padding:var(--space-4);font-family:SF Mono,Fira Code,Consolas,monospace;font-size:var(--font-size-sm);line-height:1.7;color:var(--text-primary);background:var(--bg-input);border:1px solid var(--border-card);border-radius:var(--radius-md);resize:vertical;outline:none;transition:border-color var(--transition-fast),background var(--transition-base),color var(--transition-base)}.converter-panel__textarea:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px #38bdf81a}.converter-panel__textarea--readonly{color:var(--success);cursor:default}.converter-panel__actions{display:flex;gap:var(--space-2)}.converter-actions{display:flex;flex-direction:column;justify-content:center;gap:var(--space-3)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-3) var(--space-6);font-family:var(--font-family);font-size:var(--font-size-sm);font-weight:600;border:none;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-base);white-space:nowrap}.btn--primary{color:#fff;background:var(--accent-gradient);box-shadow:0 2px 10px var(--accent-glow)}.btn--primary:hover{box-shadow:0 4px 20px #38bdf866;transform:translateY(-1px)}.btn--primary:active{transform:translateY(0)}.btn--secondary{color:var(--text-secondary);background:var(--bg-glass);border:1px solid var(--border-card)}.btn--secondary:hover{color:var(--text-primary);background:var(--btn-secondary-hover-bg);border-color:var(--btn-secondary-hover-border)}.btn--icon{font-size:1.1rem}.toast{position:fixed;bottom:var(--space-8);left:50%;transform:translate(-50%) translateY(20px);padding:var(--space-3) var(--space-6);background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius-md);color:var(--text-primary);font-size:var(--font-size-sm);box-shadow:var(--shadow-card);opacity:0;pointer-events:none;transition:all var(--transition-base);z-index:1000}.toast--visible{opacity:1;transform:translate(-50%) translateY(0)}@media(max-width:768px){.site-header{padding:0 var(--space-4)}.main-content{padding:var(--space-4)}.home-hero__title{font-size:var(--font-size-2xl)}.converter-wrapper{grid-template-columns:1fr}.converter-actions{flex-direction:row;justify-content:center}.converter-panel__textarea{min-height:200px}.tools-grid{grid-template-columns:1fr}}