:root{--bg: #f4f6fa;--surface: #ffffff;--text: #0f172a;--muted: #64748b;--border: #e2e8f0;--primary: #2563eb;--positive: #10b981;--negative: #ef4444;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}.login-screen{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#0f172a,#1e3a8a)}.login-card{background:var(--surface);padding:40px;border-radius:16px;width:360px;max-width:90vw;box-shadow:0 20px 50px #0000004d;display:flex;flex-direction:column;gap:16px}.login-card h1{font-size:20px;margin:0;text-align:center}.login-subtitle{margin:0;color:var(--muted);text-align:center;font-size:14px}.login-card label{display:flex;flex-direction:column;gap:6px;font-size:14px;color:var(--muted)}.login-card input{padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-size:15px}.login-card button{margin-top:8px;padding:12px;background:var(--primary);color:#fff;border:none;border-radius:8px;font-size:15px;cursor:pointer}.login-card button:disabled{opacity:.6;cursor:default}.login-error{background:#fef2f2;color:var(--negative);padding:8px 12px;border-radius:8px;font-size:13px;text-align:center}.app-shell{min-height:100vh}.app-header{background:var(--surface);border-bottom:1px solid var(--border);padding:14px 28px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}.app-title{font-weight:700;font-size:18px}.app-nav{display:flex;align-items:center;gap:20px}.app-nav a{color:var(--muted);text-decoration:none;font-size:14px;padding:6px 4px}.app-nav a.active{color:var(--primary);font-weight:600}.logout-btn{border:1px solid var(--border);background:transparent;padding:6px 14px;border-radius:6px;cursor:pointer;font-size:13px;color:var(--muted)}.last-updated{padding:8px 28px;font-size:12px;color:var(--muted);background:#eef2ff}.app-main{padding:24px 28px 48px}.mock-banner{background:#fffbeb;border:1px solid #fde68a;color:#92400e;padding:10px 16px;border-radius:8px;font-size:13px;margin-bottom:20px}.alert-banner{background:#fef2f2;border:1px solid #fecaca;color:#b91c1c;padding:10px 16px;border-radius:8px;font-size:13px;font-weight:600;margin-bottom:20px}.page-loading{padding:60px;text-align:center;color:var(--muted)}.kpi-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;margin-bottom:28px}.kpi-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px}.kpi-label{color:var(--muted);font-size:13px;margin-bottom:8px}.kpi-value{font-size:24px;font-weight:700}.kpi-suffix{font-size:13px;color:var(--muted);font-weight:400}.kpi-positive .kpi-value{color:var(--positive)}.kpi-negative .kpi-value{color:var(--negative)}.chart-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.chart-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px}.chart-card-wide{grid-column:span 2}.chart-card h3{margin:0 0 12px;font-size:15px;color:var(--text)}.chart-card .recharts-wrapper,.chart-card .recharts-wrapper *{direction:ltr}@media (max-width: 900px){.chart-grid{grid-template-columns:1fr}.chart-card-wide{grid-column:span 1}}.upload-section h2{margin-top:0}.upload-hint{color:var(--muted);font-size:14px;max-width:560px}.dropzone{margin-top:20px;border:2px dashed var(--border);border-radius:12px;padding:60px 20px;text-align:center;cursor:pointer;background:var(--surface);color:var(--muted);transition:border-color .15s ease}.dropzone:hover{border-color:var(--primary)}.dropzone-success{border-color:var(--positive);color:var(--positive)}.dropzone-error{border-color:var(--negative);color:var(--negative)}.upload-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:16px}.upload-slot h3{margin:0 0 4px;font-size:15px}.upload-slot .dropzone{margin-top:10px;padding:40px 16px}.upload-submit{margin-top:24px;padding:12px 28px;background:var(--primary);color:#fff;border:none;border-radius:8px;font-size:15px;cursor:pointer}.upload-submit:disabled{opacity:.6;cursor:default}.upload-message{margin-top:16px;padding:10px 16px;border-radius:8px;font-size:14px}.upload-message-success{background:#ecfdf5;color:var(--positive)}.upload-message-error{background:#fef2f2;color:var(--negative)}@media (max-width: 700px){.upload-grid{grid-template-columns:1fr}}