:root{--bg-primary: #121212;--bg-secondary: #1e1e1e;--bg-card: #2a2a2a;--accent: #ff9800;--accent-hover: #ffb74d;--text-primary: #f5f5f5;--text-secondary: #b0b0b0;--success: #4caf50;--error: #f44336;--border-radius: 8px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);display:flex;flex-direction:column;height:100vh;overflow:hidden}.app-header{display:flex;justify-content:space-between;align-items:center;padding:1rem;background:var(--bg-secondary);border-bottom:2px solid var(--accent)}.logo{font-size:1.5rem;font-weight:800;letter-spacing:1px}.logo span{color:var(--accent)}.status-indicator{font-size:.8rem;padding:.25rem .5rem;background:var(--success);color:#000;border-radius:4px;font-weight:700}.status-indicator.offline{background:var(--error);color:#fff}.app-container{flex:1;overflow-y:auto;padding:1rem;-webkit-overflow-scrolling:touch}.bottom-nav{display:flex;justify-content:space-around;background:var(--bg-secondary);border-top:2px solid #333;padding:.5rem 0}.nav-btn{background:transparent;border:none;color:var(--text-secondary);display:flex;flex-direction:column;align-items:center;font-size:.9rem;padding:.5rem 1rem;min-width:60px;cursor:pointer;transition:color .2s}.nav-btn .icon{font-size:1.5rem;margin-bottom:.25rem}.nav-btn.active{color:var(--accent)}.nav-btn:active{transform:scale(.95)}.license-gate{position:fixed;top:0;left:0;width:100vw;height:100vh;background:#121212fa;z-index:9999;display:flex;align-items:center;justify-content:center;padding:1rem}.license-card{background:var(--bg-card);border:2px solid var(--accent);border-radius:var(--border-radius);padding:2rem;max-width:400px;width:100%;text-align:center;box-shadow:0 10px 30px #00000080}.license-card .logo{margin-bottom:1.5rem}.lc-state{animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.lc-subtext{color:var(--text-secondary);font-size:.9rem;margin:1rem 0}.lc-error{color:var(--error);font-size:.85rem;margin:.5rem 0}.lc-error-msg{color:var(--error);font-size:1rem;line-height:1.5}.spinner{width:40px;height:40px;border:4px solid var(--bg-secondary);border-top:4px solid var(--accent);border-radius:50%;margin:0 auto 1rem;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.result-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:1rem}.result-item{background:var(--bg-secondary);padding:1rem;border-radius:var(--border-radius);text-align:center;border:1px solid #333}.result-item .result-value{display:block;font-size:1.5rem;color:var(--accent);font-weight:700;margin-top:.5rem}.disclaimer{font-size:.8rem;color:var(--text-secondary);text-align:center;font-style:italic;margin-top:.5rem}.converter-row{display:flex;gap:1rem}.converter-col{flex:1;display:flex;flex-direction:column}.large-result{font-size:2rem;text-align:center;padding:1rem;background:var(--bg-secondary);border-radius:var(--border-radius);border:1px solid #333;margin-top:.5rem;color:var(--accent);font-weight:700;min-height:60px;display:flex;align-items:center;justify-content:center}.warning-text{background:#ff9800;color:#000;padding:.75rem;border-radius:var(--border-radius);font-weight:700;text-align:center;margin-top:1rem;font-size:.9rem}.full-width{grid-column:1 / -1}.result-value.large{font-size:2.5rem}.system-toggle{display:flex;gap:.5rem;margin-bottom:1.5rem;background:var(--bg-secondary);padding:.25rem;border-radius:var(--border-radius);border:1px solid #333}.toggle-btn{flex:1;padding:.75rem;background:transparent;border:none;color:var(--text-secondary);font-weight:700;font-size:.9rem;cursor:pointer;border-radius:calc(var(--border-radius) - 2px);transition:all .2s;letter-spacing:1px}.toggle-btn.active{background:var(--accent);color:#000}.toggle-btn:active{transform:scale(.98)}.tools-modal{position:fixed;top:0;left:0;width:100%;height:100%;background:var(--bg-primary);z-index:1000;display:flex;flex-direction:column;animation:slideUp .3s ease}.tools-modal.hidden{display:none}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:1rem;background:var(--bg-secondary);border-bottom:2px solid var(--accent);flex-shrink:0}.modal-header h2{color:var(--accent);letter-spacing:2px}.close-btn{background:transparent;border:none;color:var(--text-primary);font-size:2rem;cursor:pointer;padding:.5rem 1rem}.tools-grid{flex:1;overflow-y:auto;padding:1rem;display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:1rem;align-content:start;max-height:calc(100vh - 80px)}.tool-card{background:var(--bg-card);border:2px solid #333;border-radius:var(--border-radius);padding:1.5rem 1rem;text-align:center;cursor:pointer;transition:all .2s;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.5rem;min-height:120px;max-height:160px}.tool-card:active{transform:scale(.95);border-color:var(--accent)}.tool-card:hover{border-color:var(--accent);background:var(--bg-secondary)}.tool-card .tool-icon{font-size:2.5rem;flex-shrink:0}.tool-card .tool-name{font-weight:700;font-size:.9rem;color:var(--text-primary);flex-shrink:0}.tool-card .tool-desc{font-size:.7rem;color:var(--text-secondary);flex-shrink:0}@media (min-width: 1024px){.tools-grid{max-width:900px;margin:0 auto;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:1.5rem;padding:2rem}.tool-card{min-height:140px;max-height:180px}.tool-card .tool-icon{font-size:3rem}.tool-card .tool-name{font-size:1rem}}.tap-presets{display:flex;flex-wrap:wrap;gap:.5rem;margin:.5rem 0 1rem}.preset-btn{flex:1;min-width:80px;padding:.5rem;background:var(--bg-secondary);border:1px solid #444;color:var(--text-primary);border-radius:var(--border-radius);font-size:.8rem;cursor:pointer}.preset-btn:active{background:var(--accent);color:#000}.result-item.highlight{border-color:var(--accent);background:linear-gradient(135deg,var(--bg-secondary),var(--bg-card))}.triangle-diagram{background:var(--bg-secondary);border-radius:var(--border-radius);padding:1rem;margin-bottom:1rem;border:1px solid #333}.triangle-svg{width:100%;max-width:250px;margin:0 auto;display:block}.triangle-inputs{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:1rem}.tri-col{display:flex;flex-direction:column;gap:.5rem}.tri-col label{font-size:.8rem;color:var(--accent);font-weight:700;letter-spacing:1px}.section-title{font-size:.85rem;color:var(--accent);font-weight:700;letter-spacing:1px;margin:1rem 0 .5rem;padding-bottom:.25rem;border-bottom:1px solid #333}.cost-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:.5rem}.cost-col{display:flex;flex-direction:column;gap:.25rem}.cost-col label{font-size:.75rem;color:var(--text-secondary)}