:root{--bg-color: #0f172a;--card-bg: #1e293b;--text-primary: #f8fafc;--text-secondary: #94a3b8;--accent: #38bdf8;--accent-hover: #0ea5e9;--border: #334155;--success: #10b981}[data-theme=light]{--bg-color: #f1f5f9;--card-bg: #ffffff;--text-primary: #0f172a;--text-secondary: #64748b;--accent: #0284c7;--accent-hover: #0369a1;--border: #e2e8f0}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background-color:var(--bg-color);color:var(--text-primary);-webkit-font-smoothing:antialiased;min-height:100vh}*{box-sizing:border-box}button{cursor:pointer;border:none;font-family:inherit;transition:all .2s}input,select{font-family:inherit;background:var(--bg-color);border:1px solid var(--border);color:var(--text-primary);padding:.5rem;border-radius:6px}input:focus,select:focus{outline:2px solid var(--accent);border-color:transparent}.app-container{max-width:1200px;margin:0 auto;padding:2rem}header{text-align:center;margin-bottom:2rem}header h1{font-size:2.5rem;margin-bottom:.5rem;background:linear-gradient(to right,var(--accent),#818cf8);-webkit-background-clip:text;-webkit-text-fill-color:transparent}header p{color:var(--text-secondary)}.card{background:var(--card-bg);border-radius:12px;padding:1.5rem;box-shadow:0 4px 6px -1px #0000001a;border:1px solid var(--border)}.top-section{display:grid;grid-template-columns:1fr 2fr;gap:2rem;margin-bottom:2rem}.control-panel{display:flex;flex-direction:column;gap:1rem;justify-content:center;align-items:center}.currency-selector{width:100%}.currency-selector label{display:block;margin-bottom:.5rem;color:var(--text-secondary);font-size:.9rem}.currency-selector select{width:100%;padding:.75rem;font-size:1.1rem}.swap-btn{background:var(--border);color:var(--accent);width:40px;height:40px;border-radius:50%;font-size:1.2rem;display:flex;align-items:center;justify-content:center}.swap-btn:hover{background:var(--accent);color:#fff;transform:rotate(180deg)}.currency-converter h3{margin-top:0;color:var(--text-secondary);font-size:1rem;text-transform:uppercase;letter-spacing:.05em}.converter-controls{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:1.5rem}.input-group label{display:block;margin-bottom:.5rem;color:var(--text-secondary);font-size:.85rem}.input-group input,.input-group select{width:100%;padding:.75rem;font-size:1.2rem}.conversion-result{text-align:center;padding-top:1rem;border-top:1px solid var(--border)}.result-text{font-size:2rem;font-weight:700;margin:0;color:var(--success)}.rate-info{margin:.5rem 0 0;color:var(--text-secondary);font-size:.9rem}.header-content{display:flex;justify-content:space-between;align-items:center;max-width:800px;margin:0 auto}.theme-toggle{background:var(--card-bg);color:var(--text-primary);border:1px solid var(--border);padding:.5rem 1rem;border-radius:20px;font-size:.9rem}.theme-toggle:hover{background:var(--border)}.charts-container{margin-top:2rem;background:var(--card-bg);padding:1.5rem;border-radius:12px;border:1px solid var(--border)}.chart-controls{display:flex;justify-content:space-between;margin-bottom:2rem;flex-wrap:wrap}.charts-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(400px,1fr));gap:2rem}.chart-wrapper{background:var(--bg-color);padding:1rem;border-radius:8px;border:1px solid var(--border);height:350px}.time-range-selector{display:flex;gap:.5rem;background:var(--bg-color);padding:.25rem;border-radius:8px}.time-range-selector button{padding:.5rem 1rem;border-radius:6px;background:transparent;color:var(--text-secondary);font-weight:500;font-size:.9rem}.time-range-selector button:hover{color:var(--text-primary)}.time-range-selector button.active{background:var(--accent);color:#fff}.exchange-chart{position:relative;height:400px;width:100%}@media(max-width:768px){.app-container{padding:1rem}.top-section{grid-template-columns:1fr}.chart-header{flex-direction:column;align-items:flex-start}}.custom-dropdown{position:relative;width:100%;font-family:inherit}.dropdown-selected{background:var(--bg-color);border:1px solid var(--border);border-radius:6px;padding:.75rem;display:flex;justify-content:space-between;align-items:center;cursor:pointer;transition:border-color .2s}.dropdown-selected:hover{border-color:var(--accent)}.dropdown-value{display:flex;align-items:center;gap:10px;font-size:1.1rem}.dropdown-flag{width:24px;height:18px;border-radius:2px;object-fit:cover}.dropdown-list{position:absolute;top:100%;left:0;right:0;margin-top:5px;background:var(--card-bg);border:1px solid var(--border);border-radius:6px;max-height:300px;overflow-y:auto;z-index:100;box-shadow:0 4px 12px #0003}.dropdown-item{padding:.75rem;display:flex;align-items:center;gap:10px;cursor:pointer;transition:background .1s}.dropdown-item:hover{background:var(--bg-color)}.dropdown-item.selected{background:var(--accent);color:#fff}