/* Kadence-like Theme Variables */
:root {
    --page-bg: #ffffff;
    --content-bg: #f7fafc;
    --text-main: #333333;
    --text-subtle: #555555;
    --accent: #0073e6;
    --accent-hover: #005bb8;
    --border-color: #e2e8f0;
    --success: #10b981; /* green-500 */
    --good: #84cc16; /* lime-500 */
    --fair: #f59e0b; /* yellow-500 */
    --poor: #ef4444; /* red-500 */
}

/* Base Styles */
.sleep-calculator-container {
    max-width: 1290px;
    margin-left: auto;
    margin-right: auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    color: var(--text-main);
    background-color: var(--content-bg);
}

.hidden {
    display: none !important;
}

/* Layout */
.calculator-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 768px) {
    .calculator-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

/* Card Styles */
.card {
    background-color: var(--page-bg);
    padding: 1.5rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.card-title {
    font-size: 1.5rem;
    line-height: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent);
}

.results-card {
    min-height: 500px;
}

/* Form Styles */
.form-grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    line-height: 1.25rem;
    font-weight: 500;
    color: var(--text-subtle);
    margin-bottom: 0.5rem;
}

.form-input {
    width: 100%;
    background-color: var(--content-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    border-radius: 0.375rem;
    padding: 0.75rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(0, 115, 230, 0.2);
}

.input-with-unit {
    position: relative;
}

.input-with-unit span {
    position: absolute;
    top: 50%;
    right: 1rem;
    transform: translateY(-50%);
    color: var(--text-subtle);
    pointer-events: none;
}

.input-with-unit input {
    padding-right: 5rem; /* Space for "minutes" text */
}

/* Results Section */
.chart-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 1rem;
}

.efficiency-donut-chart {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: conic-gradient(var(--accent) calc(var(--p, 0) * 1%), var(--border-color) 0);
    position: relative;
    transition: background 0.5s;
}

.efficiency-donut-chart::before {
    content: '';
    position: absolute;
    border-radius: 50%;
    inset: 20%;
    background: var(--page-bg);
}

#efficiency-percent {
    position: relative;
    font-size: 2.25rem;
    line-height: 2.5rem;
    font-weight: 700;
    color: var(--accent);
}

.efficiency-summary {
    text-align: center;
    margin-bottom: 1.5rem;
}

.efficiency-text {
    font-size: 1.5rem;
    line-height: 2rem;
    font-weight: 700;
}

.efficiency-subtitle {
    color: var(--text-subtle);
    margin-top: 0.25rem;
}

.text-success { color: var(--success); }
.text-good { color: var(--good); }
.text-fair { color: var(--fair); }
.text-poor { color: var(--poor); }


.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background-color: var(--content-bg);
    padding: 1rem;
    border-radius: 0.375rem;
    text-align: center;
}

.stat-label {
    font-size: 0.875rem;
    line-height: 1.25rem;
    color: var(--text-subtle);
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.5rem;
    line-height: 2rem;
    font-weight: 700;
    color: var(--accent);
}

/* Tips Section */
.tips-title {
    font-size: 1.25rem;
    line-height: 1.75rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.75rem;
}

.tips-list {
    list-style-type: disc;
    list-style-position: inside;
    color: var(--text-subtle);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.tips-list li span {
    color: var(--text-main);
    margin-left: -0.25rem;
}

/* Placeholder */
.placeholder {
    flex-grow: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 300px;
}
#placeholder-text {
    color: var(--text-subtle);
    font-size: 1.125rem;
    line-height: 1.75rem;
    max-width: 20rem;
}


/* Action Buttons */
.card-actions {
    margin-top: auto;
    padding-top: 1rem;
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background-color: var(--accent);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--accent-hover);
}

.btn-secondary {
    background-color: #e2e8f0;
    color: var(--text-subtle);
}
.btn-secondary:hover {
    background-color: #cbd5e1;
}

.btn-icon {
    width: 1.25rem;
    height: 1.25rem;
    margin-right: 0.5rem;
}