:root {
    --bg-main: #f4f7f9;
    --bg-card: #ffffff;
    --bg-overlay: #fcfdfe;
    --border: #eef2f5;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --primary: #2563eb;
    --primary-light: rgba(37, 99, 235, 0.1);
    --grid-line: rgba(30, 41, 59, 0.05);
}

[data-theme="dark"] {
    --bg-main: #0f172a;
    --bg-card: #1e293b;
    --bg-overlay: #1e293b;
    --border: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --primary: #38bdf8;
    --primary-light: rgba(56, 189, 248, 0.1);
    --grid-line: rgba(255, 255, 255, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-main);
    margin: 0;
    height: 100vh;
    width: 100vw;
}

.app-wrapper {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.main-app-header {
    background: var(--bg-main);
    padding: 24px;
    /* Explicitly removed any shadow or borders */
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.main-app-header h1 {
    margin: 0;
    font-size: 1.8rem;
    color: var(--text-primary);
    text-align: left;
    font-weight: 700;
    line-height: 1.2;
}

.header-right {
    display: flex;
    align-items: center;
}

.main-app-header .theme-toggle {
    margin-left: 20px;
    padding: 8px 12px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    display: flex;
    flex-grow: 1;
    width: 100%;
    background: transparent;
    overflow: hidden;
}

.sidebar {
    width: 360px;
    padding: 24px;
    background: transparent;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    border-right: 1px solid var(--border);
    position: relative;
}

.instructions {
    margin: 8px 0 16px 0;
}

.instructions p {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
}

.input-group {
    margin: 12px 0;
}

.theme-toggle {
    cursor: pointer;
    background: var(--primary-light);
    border: 1px solid var(--primary);
    color: var(--primary);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background: var(--primary);
    color: white;
}

.results-group {
    margin: 16px 0;
}

label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.field-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

input[type="number"] {
    width: 70px;
    padding: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.9rem;
    color: var(--text-primary);
    font-weight: 500;
}

input[type="range"] {
    flex-grow: 1;
    accent-color: var(--primary);
    cursor: pointer;
}

.results {
    margin-top: auto;
    padding-top: 20px;
}

.card {
    padding: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 12px;
    display: flex;
    flex-direction: column;
}

.card span {
    font-size: 0.75rem;
    color: var(--text-primary);
    font-weight: 700;
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card strong {
    font-size: 1.2rem;
    color: var(--text-primary);
}

.highlight {
    background: var(--primary-light);
    border: 1px solid var(--primary);
}

.highlight strong {
    color: var(--primary);
}

.chart-container {
    flex-grow: 1;
    padding: 40px;
    background: transparent;
    display: flex;
    flex-direction: column;
}

#gmfmChart {
    width: 100%;
    height: 100% !important;
}

.reference-section {
    margin-top: auto;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.reference-box {
    padding: 12px;
    background: var(--bg-card);
    border: 1px dashed var(--border);
    border-radius: 6px;
    transition: all 0.2s ease;
}

.reference-box:hover {
    border-style: solid;
    border-color: var(--primary);
}

.reference-title {
    display: block;
    font-size: 0.7rem;
    color: var(--text-secondary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}

.reference-link-text {
    font-size: 0.85rem;
    color: var(--primary);
    text-decoration: none;
    line-height: 1.4;
    display: block;
}

.reference-link-text:hover {
    text-decoration: underline;
}