:root {
    --tracker-bg: linear-gradient(135deg, #f7efe4 0%, #dcefff 50%, #f6d8bf 100%);
    --tracker-card: rgba(255, 255, 255, 0.88);
    --tracker-text: #1f3a5f;
    --tracker-muted: #5f6f82;
    --tracker-accent: #e07a5f;
    --tracker-accent-dark: #c9654d;
    --tracker-highlight: #81b29a;
    --tracker-border: rgba(31, 58, 95, 0.1);
}

body {
    min-height: 100vh;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    color: var(--tracker-text);
    background: var(--tracker-bg);
}

.tracker-section {
    min-height: 100vh;
    position: relative;
    overflow: hidden;
}

.tracker-section::before,
.tracker-section::after {
    content: "";
    position: absolute;
    border-radius: 50%;
    filter: blur(10px);
    z-index: 0;
}

.tracker-section::before {
    width: 280px;
    height: 280px;
    background: rgba(224, 122, 95, 0.18);
    top: 7%;
    left: 8%;
}

.tracker-section::after {
    width: 220px;
    height: 220px;
    background: rgba(129, 178, 154, 0.24);
    right: 10%;
    bottom: 8%;
}

.container {
    position: relative;
    z-index: 1;
}

.tracker-card {
    background: var(--tracker-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--tracker-border);
    border-radius: 28px;
}

.tracker-badge {
    background-color: rgba(129, 178, 154, 0.18);
    color: #2b5d4b;
    letter-spacing: 0.04em;
    font-weight: 700;
}

.card h2 {
    color: var(--tracker-text);
}

.form-label {
    color: var(--tracker-text);
}

.form-select,
.form-control {
    border: 1px solid rgba(31, 58, 95, 0.15);
    border-radius: 16px;
    padding: 0.9rem 1rem;
    box-shadow: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.form-select:focus,
.form-control:focus {
    border-color: rgba(224, 122, 95, 0.55);
    box-shadow: 0 0 0 0.25rem rgba(224, 122, 95, 0.18);
    transform: translateY(-1px);
}

.tracker-btn {
    background: linear-gradient(135deg, var(--tracker-accent), #f2a65a);
    border: none;
    border-radius: 16px;
    color: #fff;
    font-weight: 700;
    letter-spacing: 0.03em;
    padding: 0.95rem 1.25rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.tracker-btn:hover {
    background: linear-gradient(135deg, var(--tracker-accent-dark), #ea9440);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 14px 30px rgba(224, 122, 95, 0.28);
}

.output-panel {
    min-height: 120px;
    border-radius: 20px;
    padding: 1rem;
    background: linear-gradient(145deg, rgba(129, 178, 154, 0.15), rgba(220, 239, 255, 0.9));
    border: 1px solid rgba(129, 178, 154, 0.25);
    overflow: auto;
}

#output.py-error,
#output:empty::before {
    color: var(--tracker-muted);
    font-style: italic;
}

#output:empty::before {
    content: "Your graph will appear here.";
}

@media (max-width: 576px) {
    .tracker-card {
        border-radius: 22px;
    }

    .card-body {
        padding: 1.5rem !important;
    }
}