*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--primary: #2563eb;--primary-hover: #1d4ed8;--success: #16a34a;--error: #dc2626;--bg: #f8fafc;--card-bg: #ffffff;--border: #e2e8f0;--text: #1e293b;--text-muted: #64748b;--shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);--shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1), 0 4px 6px -2px rgba(0,0,0,.05)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,system-ui,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;line-height:1.5}.loading-screen{display:flex;align-items:center;justify-content:center;min-height:100vh}.spinner{display:inline-block;width:16px;height:16px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite;margin-right:8px}.spinner.large{width:40px;height:40px;border-color:var(--border);border-top-color:var(--primary)}@keyframes spin{to{transform:rotate(360deg)}}.login-container{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#1e3a5f,#2563eb);padding:20px}.login-card{background:var(--card-bg);border-radius:16px;padding:40px;width:100%;max-width:400px;box-shadow:var(--shadow-lg)}.login-logo{text-align:center;margin-bottom:32px}.login-logo .logo-icon{font-size:48px;display:block;margin-bottom:8px}.login-logo h1{font-size:28px;font-weight:700;color:var(--text)}.login-logo p{color:var(--text-muted);margin-top:4px}.login-form{display:flex;flex-direction:column;gap:16px}.field{display:flex;flex-direction:column;gap:6px}.field label{font-size:13px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px}.field input,.field select{padding:10px 14px;border:1.5px solid var(--border);border-radius:8px;font-size:15px;color:var(--text);background:#fff;transition:border-color .2s;outline:none}.field input:focus,.field 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24px;height:60px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:10;box-shadow:var(--shadow)}.header-left{display:flex;align-items:center;gap:10px}.header-left .logo-icon{font-size:24px}.header-left h1{font-size:20px;font-weight:700}.header-subtitle{color:var(--text-muted);font-size:13px}.header-right{display:flex;align-items:center;gap:12px}.user-badge{background:#eff6ff;color:var(--primary);padding:4px 12px;border-radius:999px;font-size:13px;font-weight:600}.main-content{max-width:800px;margin:0 auto;padding:32px 20px;display:flex;flex-direction:column;gap:24px}.converter-card,.history-card{background:var(--card-bg);border-radius:16px;padding:32px;box-shadow:var(--shadow);border:1px solid var(--border)}.converter-card h2{font-size:22px;margin-bottom:6px}.card-desc{color:var(--text-muted);font-size:14px;margin-bottom:24px}.converter-form{display:flex;flex-direction:column;gap:20px}.drop-zone{border:2px dashed var(--border);border-radius:12px;padding:32px;text-align:center;cursor:pointer;transition:all .2s;min-height:120px;display:flex;align-items:center;justify-content:center}.drop-zone:hover,.drop-zone.drag-over{border-color:var(--primary);background:#eff6ff}.drop-zone.has-file{border-style:solid;border-color:var(--success);background:#f0fdf4;cursor:default}.drop-hint{display:flex;flex-direction:column;gap:6px;color:var(--text-muted)}.drop-icon{font-size:36px}.drop-sub{font-size:12px;opacity:.7}.file-selected{display:flex;align-items:center;gap:14px;width:100%}.file-icon{font-size:32px}.file-info{flex:1;text-align:left}.file-name{display:block;font-weight:600;font-size:15px;word-break:break-all}.file-size{font-size:12px;color:var(--text-muted)}.btn-remove{background:none;border:none;font-size:18px;color:var(--text-muted);cursor:pointer;padding:4px 8px}.btn-remove:hover{color:var(--error)}.settings-row{display:flex;gap:16px;flex-wrap:wrap}.field-rate{flex:2;min-width:140px}.field-currency,.field-decimals{flex:1;min-width:100px}.rate-preview{background:#f1f5f9;border-radius:8px;padding:10px 14px;font-size:13px;color:var(--text-muted);font-family:monospace}.btn-convert{width:100%;padding:14px;font-size:16px}.result-card{margin-top:24px;background:#f0fdf4;border:1.5px solid #86efac;border-radius:12px;padding:24px;display:flex;flex-direction:column;gap:16px}.result-header{display:flex;align-items:center;gap:10px;font-size:16px}.result-icon{font-size:24px}.result-stats{display:flex;gap:24px;flex-wrap:wrap}.stat{display:flex;flex-direction:column}.stat-val{font-size:28px;font-weight:700;color:var(--success);line-height:1}.stat-label{font-size:12px;color:var(--text-muted);margin-top:2px}.btn-download{background:var(--success)}.btn-download:hover:not(:disabled){background:#15803d}.btn-new{align-self:flex-start}.history-card h3{font-size:16px;margin-bottom:16px}.history-list{display:flex;flex-direction:column;gap:10px}.history-item{display:flex;align-items:center;gap:12px;padding:10px 14px;background:var(--bg);border-radius:8px;flex-wrap:wrap}.history-file{font-size:13px;font-weight:600;flex:1;min-width:180px}.history-meta{font-size:12px;color:var(--text-muted)}.history-date{font-size:12px;color:var(--text-muted);margin-left:auto}@media(max-width:600px){.settings-row{flex-direction:column}.converter-card,.history-card{padding:20px}.stat-val{font-size:22px}}