:root{--bg: #ffffff;--bg-secondary: #f8fafc;--text: #0f172a;--text-secondary: #64748b;--border: #e2e8f0;--primary: #6366f1;--primary-hover: #4f46e5;--card-bg: #ffffff;--shadow: 0 1px 3px rgba(0,0,0,.1);--shadow-hover: 0 10px 25px rgba(0,0,0,.1)}.dark{--bg: #0f172a;--bg-secondary: #1e293b;--text: #f1f5f9;--text-secondary: #94a3b8;--border: #334155;--card-bg: #1e293b;--shadow: 0 1px 3px rgba(0,0,0,.3);--shadow-hover: 0 10px 25px rgba(0,0,0,.4)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;transition:background .3s,color .3s}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:1200px;margin:0 auto;padding:0 20px}.header{position:sticky;top:0;z-index:100;background:var(--bg);border-bottom:1px solid var(--border);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}.logo{font-size:1.4rem;font-weight:800;color:var(--text);display:flex;align-items:center;gap:8px}.logo-icon{width:32px;height:32px;background:var(--primary);border-radius:8px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700}.nav{display:flex;gap:20px;align-items:center}.nav a{color:var(--text-secondary);font-size:.9rem;font-weight:500}.nav a:hover{color:var(--primary);text-decoration:none}.header-actions{display:flex;gap:10px;align-items:center}.btn{padding:8px 16px;border-radius:8px;border:none;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .2s;display:inline-flex;align-items:center;gap:6px}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover)}.btn-secondary{background:var(--bg-secondary);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{border-color:var(--primary)}.btn-icon{width:38px;height:38px;padding:0;justify-content:center;border-radius:8px;background:var(--bg-secondary);border:1px solid var(--border);color:var(--text);cursor:pointer;font-size:1.1rem}.btn-icon:hover{border-color:var(--primary)}.lang-dropdown{position:relative}.lang-menu{position:absolute;top:45px;right:0;background:var(--card-bg);border:1px solid var(--border);border-radius:10px;box-shadow:var(--shadow-hover);min-width:180px;padding:6px;z-index:200}.lang-item{padding:8px 12px;border-radius:6px;cursor:pointer;font-size:.85rem;display:flex;align-items:center;gap:8px;color:var(--text)}.lang-item:hover{background:var(--bg-secondary)}.lang-item.active{background:var(--primary);color:#fff}.hero{text-align:center;padding:80px 20px 60px;background:linear-gradient(135deg,#6366f11a,#a855f71a)}.hero h1{font-size:2.8rem;font-weight:800;margin-bottom:16px;background:linear-gradient(135deg,#6366f1,#a855f7);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero p{font-size:1.2rem;color:var(--text-secondary);max-width:600px;margin:0 auto 30px}.search-box{max-width:500px;margin:0 auto;position:relative}.search-box input{width:100%;padding:14px 20px 14px 48px;border:2px solid var(--border);border-radius:12px;font-size:1rem;background:var(--card-bg);color:var(--text);transition:border-color .2s}.search-box input:focus{outline:none;border-color:var(--primary)}.search-icon{position:absolute;left:16px;top:50%;transform:translateY(-50%);color:var(--text-secondary);font-size:1.2rem}.section{padding:60px 0}.section-title{font-size:1.8rem;font-weight:700;margin-bottom:30px;text-align:center}.category-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px}.category-card{background:var(--card-bg);border:1px solid var(--border);border-radius:16px;padding:28px;text-align:center;transition:all .3s;cursor:pointer;text-decoration:none;color:var(--text)}.category-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:var(--primary);text-decoration:none}.category-icon{font-size:2.5rem;margin-bottom:14px}.category-card h3{font-size:1.15rem;font-weight:700;margin-bottom:8px}.category-card p{font-size:.85rem;color:var(--text-secondary)}.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}.tool-card{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;padding:20px;transition:all .2s;cursor:pointer;text-decoration:none;color:var(--text);display:flex;gap:14px;align-items:flex-start}.tool-card:hover{border-color:var(--primary);box-shadow:var(--shadow);text-decoration:none;transform:translateY(-2px)}.tool-card-icon{width:44px;height:44px;border-radius:10px;background:linear-gradient(135deg,#6366f126,#a855f726);display:flex;align-items:center;justify-content:center;font-size:1.3rem;flex-shrink:0}.tool-card h4{font-size:.95rem;font-weight:600;margin-bottom:4px}.tool-card p{font-size:.8rem;color:var(--text-secondary);line-height:1.4}.tool-badge{display:inline-block;padding:2px 8px;border-radius:4px;font-size:.7rem;font-weight:600;background:#6366f11a;color:var(--primary);margin-top:6px}.tool-page{padding:40px 0}.breadcrumb{font-size:.85rem;color:var(--text-secondary);margin-bottom:20px}.breadcrumb a{color:var(--text-secondary)}.tool-header{margin-bottom:30px}.tool-header h1{font-size:2rem;font-weight:700;margin-bottom:8px;display:flex;align-items:center;gap:12px}.tool-header p{color:var(--text-secondary);font-size:1rem}.tool-workspace{background:var(--card-bg);border:1px solid var(--border);border-radius:16px;padding:30px;margin-bottom:30px}.tool-about{background:var(--bg-secondary);border-radius:12px;padding:24px}.tool-about h3{font-size:1.1rem;margin-bottom:10px}.tool-about p{color:var(--text-secondary);font-size:.9rem}.form-group{margin-bottom:20px}.form-group label{display:block;font-weight:600;margin-bottom:8px;font-size:.9rem}.form-group input,.form-group select,.form-group textarea{width:100%;padding:10px 14px;border:1px solid var(--border);border-radius:8px;font-size:.95rem;background:var(--bg);color:var(--text)}.form-group input:focus,.form-group select:focus{outline:none;border-color:var(--primary)}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}.result-box{background:var(--bg-secondary);border:1px solid var(--border);border-radius:10px;padding:20px;margin-top:20px}.result-value{font-size:1.5rem;font-weight:700;color:var(--primary)}.calc-display{background:var(--bg);border:2px solid var(--border);border-radius:10px;padding:16px;text-align:right;font-size:2rem;font-weight:700;margin-bottom:16px;min-height:60px;word-break:break-all}.calc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.calc-btn{padding:16px;font-size:1.1rem;font-weight:600;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--text);cursor:pointer;transition:all .15s}.calc-btn:hover{background:var(--bg-secondary)}.calc-btn.op{background:var(--primary);color:#fff;border-color:var(--primary)}.calc-btn.op:hover{background:var(--primary-hover)}.calc-btn.equals{background:#10b981;color:#fff;border-color:#10b981;grid-column:span 2}.calc-btn.clear{background:#ef4444;color:#fff;border-color:#ef4444}.footer{border-top:1px solid var(--border);padding:40px 0 20px;margin-top:60px;background:var(--bg-secondary)}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;margin-bottom:30px}.footer-col h4{font-size:.9rem;font-weight:700;margin-bottom:14px;text-transform:uppercase;letter-spacing:.5px}.footer-col a{display:block;color:var(--text-secondary);font-size:.85rem;margin-bottom:8px}.footer-col a:hover{color:var(--primary);text-decoration:none}.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid var(--border);color:var(--text-secondary);font-size:.8rem}.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px;margin-top:40px}.feature-card{text-align:center;padding:24px}.feature-icon{font-size:2rem;margin-bottom:12px}.feature-card h4{font-size:1rem;font-weight:700;margin-bottom:6px}.feature-card p{font-size:.85rem;color:var(--text-secondary)}.upload-area{border:2px dashed var(--border);border-radius:12px;padding:40px;text-align:center;cursor:pointer;transition:all .2s;background:var(--bg-secondary)}.upload-area:hover{border-color:var(--primary);background:#6366f10d}.upload-area.dragover{border-color:var(--primary);background:#6366f11a}.upload-icon{font-size:2.5rem;margin-bottom:12px}.upload-area p{color:var(--text-secondary);font-size:.9rem}.file-list{margin-top:16px}.file-item{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;background:var(--bg);border-radius:8px;margin-bottom:8px;font-size:.85rem}.file-item button{background:none;border:none;color:#ef4444;cursor:pointer;font-size:1.1rem}@media (max-width: 768px){.hero h1{font-size:1.8rem}.hero p{font-size:1rem}.nav{display:none}.footer-grid{grid-template-columns:1fr 1fr}.form-row{grid-template-columns:1fr}.calc-grid{gap:6px}.calc-btn{padding:12px;font-size:1rem}.tool-workspace{padding:20px}}.rtl{direction:rtl;text-align:right}.rtl .search-icon{left:auto;right:16px}.rtl .search-box input{padding:14px 48px 14px 20px}