:root {
    --primary: #1a237e;
    --secondary: #f5f6fa;
    --accent: #00b894;
    --danger: #d63031;
    --text: #222;
    --background: #f0f2f5;
    --header-bg: #fff;
    --card-bg: #fff;
    --border-radius: 18px;
    --shadow: 0 6px 24px rgba(30, 42, 73, 0.07);
    --font-main: 'Inter', Arial, sans-serif;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: var(--font-main);
    background: var(--background);
    color: var(--text);
    height: 100%;
}
body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
.container {
    max-width: 900px;
    margin: 32px auto;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 24px;
}
.main-header {
    background: var(--header-bg);
    padding: 28px 32px 20px 32px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.main-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0 0 16px 0;
    letter-spacing: -1px;
    color: var(--primary);
}
.portfolio-summary {
    display: flex;
    gap: 32px;
    justify-content: center;
    align-items: center;
    padding: 16px 24px;
    font-size: 1.15rem;
    margin-top: 4px;
}
.summary-label {
    color: #555;
    font-weight: 600;
}
.summary-value {
    font-weight: 700;
    color: var(--accent);
    margin-left: 8px;
    font-size: 1.15em;
}
.card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 22px 28px;
    margin-bottom: 12px;
}
.main-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    grid-gap: 24px;
}
.chart-section {
    grid-column: 1;
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.chart-section h2,
.trading-section h2,
.portfolio-section h2 {
    margin: 0 0 18px 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary);
}
#stockChart {
    width: 100% !important;
    height: 280px !important;
    background: #f5f6fa;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(30, 42, 73, 0.06);
    margin-bottom: 10px;
}
.stock-selector {
    display: flex;
    align-items: center;
    gap: 18px;
    font-size: 1em;
}
#stockSelect {
    padding: 8px 16px;
    border: 1px solid #e3e6ee;
    border-radius: 8px;
    font-size: 1em;
    background: #fafafa;
}
.price-info {
    font-weight: 700;
    color: var(--primary);
}
.trading-section {
    grid-column: 2;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}
#tradeForm {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 18px;
}
#shares {
    padding: 14px 16px;
    border: 1px solid #e3e6ee;
    border-radius: 8px;
    font-size: 1.1em;
    outline: none;
    margin-bottom: 8px;
    background: #fafafa;
}
.trade-btns {
    display: flex;
    gap: 14px;
}
.btn {
    border: none;
    padding: 12px 32px;
    border-radius: 8px;
    font-size: 1.08em;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.13s, box-shadow 0.13s;
    box-shadow: 0 2px 8px rgba(30,42,73,0.05);
}
.btn.buy {
    background: var(--accent);
    color: #fff;
}
.btn.buy:hover {
    background: #00906b;
}
.btn.sell {
    background: var(--danger);
    color: #fff;
}
.btn.sell:hover {
    background: #b41519;
}
.portfolio-section {
    grid-column: 1 / span 2;
}
#portfolioList {
    display: flex;
    flex-direction: column;
    gap: 11px;
    margin-top: 10px;
}
#portfolioList > div {
    background: #f8fafc;
    border-radius: 8px;
    padding: 12px 18px;
    font-size: 1.08em;
    color: #333;
    box-shadow: 0 1px 2px rgba(30,42,73,0.03);
}
footer {
    background: none;
    color: #888;
    text-align: center;
    font-size: 1em;
    padding: 22px 0 0 0;
}

@media (max-width: 800px) {
    .container {
        max-width: 98vw;
        margin: 12px auto;
    }
    .main-content {
        grid-template-columns: 1fr;
        grid-gap: 14px;
    }
    .portfolio-section {
        grid-column: 1;
    }
    .main-header {
        padding: 18px 7vw 14px 7vw;
    }
    .card {
        padding: 18px 6vw;
    }
}