/* GLOBAL STYLES */
body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: #f3f4f6;
    color: #1f2937;
    margin: 0;
    padding: 20px;
}

.app-container {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

h1 { margin-top: 0; color: #111827; }
h2 { font-size: 1.25rem; margin-bottom: 10px; }

/* CONTROLS */
.control-panel {
    background-color: #f9fafb;
    padding: 20px;
    border-radius: 6px;
    border: 1px solid #e5e7eb;
    margin-bottom: 20px;
}

.input-group { margin-bottom: 15px; }
.input-group label { display: block; font-weight: 600; margin-bottom: 5px; }
.input-group small { display: block; color: #6b7280; margin-top: 2px; font-size: 0.85em; }

/* BUTTONS */
button {
    cursor: pointer;
    padding: 10px 20px;
    border-radius: 4px;
    font-weight: 600;
    border: none;
    transition: background 0.2s;
}

.btn-primary { background-color: #2563eb; color: white; }
.btn-primary:hover { background-color: #1d4ed8; }

.btn-secondary { background-color: #4b5563; color: white; margin-right: 10px; }
.btn-secondary:hover { background-color: #374151; }

.actions { margin-top: 20px; display: flex; align-items: center; gap: 15px; }

/* UTILITY */
.hidden { display: none; }

.status-text { font-weight: 500; color: #6b7280; }
.status-error { color: #dc2626; }
.status-success { color: #059669; }

/* TABLE STYLES (From previous step) */
:root {
    --color-new-buy: #e6fffa;
    --color-full-sell: #ffe6e6;
    --color-increase: #f0fff4;
    --color-decrease: #fff5f5;
    --color-text-buy: #047857;
    --color-text-sell: #c53030;
    --border-color: #e2e8f0;
}

#tradeTable { width: 100%; border-collapse: collapse; margin-top: 20px; font-size: 14px; }
#tradeTable th { background-color: #f7fafc; text-align: left; padding: 12px; border-bottom: 2px solid var(--border-color); }
#tradeTable td { padding: 10px; border-bottom: 1px solid var(--border-color); }
.num-cell { text-align: right; font-family: 'Courier New', monospace; }

/* Status Classes */
.row-new-buy { background-color: var(--color-new-buy); color: var(--color-text-buy); font-weight: bold; }
.row-full-sell { background-color: var(--color-full-sell); color: var(--color-text-sell); text-decoration: line-through; }
.row-increase { background-color: var(--color-increase); }
.row-decrease { background-color: var(--color-decrease); }