:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --accent: #2196f3;
    --accent-glow: rgba(33, 150, 243, 0.3);
    --title-color: #ffffff;
    --border-color: #333333;
    --peak-color: #4caf50;
    --valley-color: #f44336;
    --pending-color: #ff9800;
}
* {
    box-sizing: border-box;
    transition: background-color 0.3s, border-color 0.3s;
}
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}
h1 {
    color: var(--title-color);
    margin-bottom: 30px;
    font-weight: 800;
    letter-spacing: -0.02em;
}
.controls {
    margin-bottom: 30px;
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
    max-width: 1000px;
}
select {
    padding: 12px 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    color: var(--text-color);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    min-width: 180px;
}
select:hover {
    border-color: var(--accent);
}
.dashboard {
    display: flex;
    flex-wrap: wrap;
    gap: 25px;
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    justify-content: center;
}
.highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    width: 100%;
    margin-bottom: 25px;
}
.highlight-card {
    background: linear-gradient(145deg, #1e1e1e, #161616);
    padding: 20px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    text-align: center;
    position: relative;
    overflow: hidden;
}
.card-title h3 {
    margin: 0 0 15px 0;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #888;
}
.split-container {
    display: flex;
    justify-content: center;
    gap: 15px;
}
.split-half {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.split-half .label {
    font-size: 0.7rem;
    font-weight: 800;
    margin-bottom: 4px;
}
.split-peak .label { color: var(--peak-color); }
.split-valley .label { color: var(--valley-color); }

.split-half .value {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--title-color);
    line-height: 1;
}
.split-half .date {
    font-size: 0.75rem;
    color: #666;
    margin-top: 4px;
}
@media (max-width: 480px) {
    .dashboard {
        grid-template-columns: 1fr;
    }
    .split-half .value {
        font-size: 1.4rem;
    }
}
.summary-card {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: 25px 40px;
    background: linear-gradient(145deg, #1e1e1e, #161616);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    max-width: 1100px;
    margin: 10px auto 30px auto;
    width: 100%;
    gap: 20px;
}
.summary-item {
    flex: 1;
    text-align: center;
    position: relative;
}
.summary-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: -10px;
    top: 20%;
    height: 60%;
    width: 1px;
    background: rgba(255, 255, 255, 0.1);
}
.summary-item h3 {
    margin: 0 0 8px 0;
    color: #7f8c8d;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.summary-item p {
    margin: 0;
    font-size: 2rem;
    font-weight: 800;
    color: var(--title-color);
}
.summary-item p.accent-val {
    color: var(--accent);
    text-shadow: 0 0 15px var(--accent-glow);
}
.card {
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    border: 1px solid var(--border-color);
    flex: 1 1 400px;
    max-width: 100%;
}
.card.card-wide {
    flex: 1 1 100%;
}
.card h2 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--title-color);
}
.chart-container {
    position: relative;
    width: 100%;
    height: 300px;
}
.footer {
    margin-top: 40px;
    font-size: 0.9rem;
    color: #7f8c8d;
    max-width: 1100px;
    width: 100%;
    margin: 40px auto;
    text-align: center;
    border-top: 1px solid var(--border-color);
    padding-top: 30px;
}