:root{--bg-primary:#f8fafc;--bg-secondary:#ffffff;--text-primary:#0f172a;--text-secondary:#475569;--text-tertiary:#94a3b8;--brand-primary:#6366f1;--brand-secondary:#ec4899;--brand-gradient:linear-gradient(135deg, #6366f1 0%, #ec4899 100%);--arduino-color:#00979d;--esp32-color:#e91e63;--esp8266-color:#10b981;--rpi-color:#ef4444;--border-color:#e2e8f0;--card-shadow:0 4px 6px -1px rgba(0, 0, 0, 0.1),0 2px 4px -1px rgba(0, 0, 0, 0.06);--card-shadow-hover:0 10px 15px -3px rgba(0, 0, 0, 0.1),0 4px 6px -2px rgba(0, 0, 0, 0.05);--radius-lg:1rem;--radius-md:0.75rem;--radius-full:9999px}body{background-color:var(--bg-primary);color:var(--text-primary);font-family:Inter,system-ui,-apple-system,sans-serif;margin:0;overflow-x:hidden}.download-wrapper{min-height:100vh;padding-top:20px;background:radial-gradient(circle at 50% 0,rgba(99,102,241,.05) 0,transparent 50%)}.download-main{max-width:1200px;margin:0 auto;padding:.3rem 1.5rem}.hero-section{text-align:center;padding:3rem 0 5rem;max-width:800px;margin:0 auto}.badge-pill{display:inline-flex;align-items:center;gap:.5rem;background:rgba(99,102,241,.1);color:var(--brand-primary);padding:.5rem 1rem;border-radius:var(--radius-full);font-size:.875rem;font-weight:600;margin-bottom:1.5rem}.hero-title{font-size:3.5rem;font-weight:800;line-height:1.1;margin-bottom:1.5rem;color:var(--text-primary)}.gradient-text{background:var(--brand-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-description{font-size:1.125rem;color:var(--text-secondary);line-height:1.6;margin-bottom:2.5rem;max-width:600px;margin-left:auto;margin-right:auto}.hero-buttons{display:flex;justify-content:center;gap:1rem}.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.875rem 1.75rem;border-radius:var(--radius-md);font-weight:600;text-decoration:none;transition:transform .2s,box-shadow .2s}.btn:hover{transform:translateY(-2px)}.btn-primary{background:var(--brand-primary);color:#fff;box-shadow:0 4px 6px rgba(99,102,241,.25)}.btn-secondary{background:#fff;color:var(--text-primary);border:1px solid var(--border-color);box-shadow:0 1px 2px rgba(0,0,0,.05)}.platform-section{margin-bottom:6rem}.section-title{text-align:center;font-size:2rem;font-weight:700;margin-bottom:.75rem}.section-subtitle{text-align:center;color:var(--text-secondary);margin-bottom:3rem;max-width:600px;margin-left:auto;margin-right:auto}.platform-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:2rem}.platform-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:2rem;position:relative;transition:all .3s ease;display:flex;flex-direction:column}.platform-card.arduino{border-top:4px solid var(--arduino-color)}.platform-card.esp32{border-top:4px solid var(--esp32-color)}.platform-card.esp8266{border-top:4px solid var(--esp8266-color)}.platform-card.rpi{border-top:4px solid var(--rpi-color)}.card-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:1.5rem}.icon-box{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;color:#fff}.arduino .icon-box{background:var(--arduino-color)}.esp32 .icon-box{background:var(--esp32-color)}.esp8266 .icon-box{background:var(--esp8266-color)}.rpi .icon-box{background:var(--rpi-color)}.version-info{text-align:right;display:flex;flex-direction:column;align-items:flex-end}.version-badge{font-size:.75rem;font-weight:700;background:var(--bg-primary);padding:2px 8px;border-radius:4px;margin-bottom:4px}.downloads-count{font-size:.75rem;color:var(--text-tertiary)}.platform-card h3{font-size:1.25rem;margin-bottom:.25rem}.platform-meta{font-size:.8rem;color:var(--text-tertiary);margin-bottom:1rem;text-transform:uppercase;letter-spacing:.05em}.card-desc{font-size:.95rem;color:var(--text-secondary);margin-bottom:1.5rem;flex-grow:1}.feature-list{list-style:none;padding:0;margin:0 0 2rem 0}.feature-list li{font-size:.9rem;color:var(--text-secondary);margin-bottom:.75rem;display:flex;align-items:center;gap:.75rem}.arduino .feature-list i{color:var(--arduino-color)}.esp32 .feature-list i{color:var(--esp32-color)}.esp8266 .feature-list i{color:var(--esp8266-color)}.rpi .feature-list i{color:var(--rpi-color)}.card-footer{display:grid;grid-template-columns:1fr auto;gap:.75rem;margin-top:auto}.download-btn{text-align:center;padding:.75rem;border-radius:var(--radius-md);text-decoration:none;font-weight:600;font-size:.9rem;color:#fff;transition:opacity .2s}.download-btn:hover{opacity:.9}.arduino .download-btn{background:var(--arduino-color)}.esp32 .download-btn{background:var(--esp32-color)}.esp8266 .download-btn{background:var(--esp8266-color)}.rpi .download-btn{background:var(--rpi-color)}.docs-btn{display:flex;align-items:center;justify-content:center;width:42px;border:1px solid var(--border-color);border-radius:var(--radius-md);color:var(--text-secondary);transition:all .2s}.docs-btn:hover{background:var(--bg-primary);color:var(--text-primary)}.installation-section{margin-bottom:6rem;text-align:center}.steps-grid{display:flex;justify-content:space-between;align-items:flex-start;gap:1rem;position:relative;margin-top:3rem}.step-card{background:#fff;padding:2rem 1.5rem;border-radius:var(--radius-lg);border:1px solid var(--border-color);flex:1;text-align:left;position:relative;z-index:2}.step-number{width:40px;height:40px;background:var(--brand-primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.125rem;margin-bottom:1.5rem;box-shadow:0 4px 6px rgba(99,102,241,.2)}.step-card:nth-child(5) .step-number{background:#818cf8}.step-card:first-child .step-number{background:#6366f1}.step-card:nth-child(3) .step-number{background:#8b5cf6}.step-card:nth-child(7) .step-number{background:#ec4899}.step-card h4{margin-bottom:.75rem;font-size:1.1rem}.step-card p{font-size:.9rem;color:var(--text-secondary);line-height:1.5}.step-arrow{padding-top:3.5rem;color:var(--text-tertiary);font-size:1.25rem;flex:0 0 auto}@media (max-width:900px){.steps-grid{flex-direction:column;align-items:stretch}.step-arrow{display:none}}.features-section{margin-bottom:4rem}.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:2rem}.feature-item{text-align:center;padding:2rem;background:#fff;border-radius:var(--radius-lg);border:1px solid var(--border-color)}.feature-icon{font-size:2rem;margin-bottom:1rem}.feature-item:first-child .feature-icon{color:#3b82f6}.feature-item:nth-child(2) .feature-icon{color:#eab308}.feature-item:nth-child(3) .feature-icon{color:#8b5cf6}.feature-item:nth-child(4) .feature-icon{color:#10b981}.feature-item h4{margin-bottom:.5rem;font-size:1.125rem}.feature-item p{color:var(--text-secondary);font-size:.9rem}@media (max-width:768px){.btn-primary{padding:1rem 0}.btn-secondary{padding:1rem 0}.hero-title{font-size:2.5rem}.hero-description{font-size:1rem}.download-main{padding:1.5rem 3rem}.platform-grid{grid-template-columns:1fr;gap:1.5rem}.platform-card{padding:1.5rem}.features-grid{grid-template-columns:repeat(2,1fr)}.section-title{font-size:1.75rem}.section-subtitle{font-size:1rem}.hero-buttons{flex-direction:column;width:100%}.hero-buttons .btn{width:100%;justify-content:center}}@media (max-width:480px){.hero-section{padding:2rem 0 3rem}.hero-title{font-size:2rem;line-height:1.2}.hero-description{font-size:.95rem}.badge-pill{font-size:.75rem;padding:.4rem .8rem}.features-grid{grid-template-columns:1fr}.hero-buttons{flex-direction:column;gap:.75rem}.platform-card h3{font-size:1.125rem}.card-desc{font-size:.875rem}.feature-list li{font-size:.85rem}.icon-box{width:40px;height:40px;font-size:1.25rem}.version-badge{font-size:.7rem}.downloads-count{font-size:.7rem}.step-card{padding:1.5rem 1rem}.step-card h4{font-size:1rem}.step-card p{font-size:.85rem}.step-number{width:36px;height:36px;font-size:1rem}.download-btn{padding:.65rem;font-size:.85rem}.docs-btn{width:40px}.installation-section,.platform-section{margin-bottom:4rem}}