/**
 * Scientific Calculator - Styles
 *
 * Responsive, themable calculator component using CSS custom properties.
 */

/* ============================================================
   CSS Custom Properties (Defaults - Light Theme)
   ============================================================ */
.sc-calculator {
    --sc-bg: #ffffff;
    --sc-bg-secondary: #f8f9fa;
    --sc-text: #212529;
    --sc-text-muted: #6c757d;
    --sc-border: #dee2e6;
    --sc-primary: #0d6efd;
    --sc-primary-hover: #0b5ed7;
    --sc-error: #dc3545;
    --sc-radius: 8px;
    --sc-radius-sm: 4px;
    --sc-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --sc-spacing: 16px;
    --sc-font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;

    font-family: var(--sc-font);
    max-width: 420px;
    width: 100%;
    margin: 0 auto;
}

/* ============================================================
   Dark Theme
   ============================================================ */
.sc-calculator--dark {
    --sc-bg: #1a1d21;
    --sc-bg-secondary: #2b2f35;
    --sc-text: #e4e6eb;
    --sc-text-muted: #9ca3af;
    --sc-border: #3a3f47;
    --sc-primary: #3b82f6;
    --sc-primary-hover: #2563eb;
    --sc-error: #ef4444;
    --sc-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* ============================================================
   Card Container
   ============================================================ */
.sc-calculator__header {
    background: var(--sc-primary);
    color: #ffffff;
    padding: var(--sc-spacing);
    border-radius: var(--sc-radius) var(--sc-radius) 0 0;
}

.sc-calculator__title {
    margin: 0 0 2px;
    font-size: 1.125rem;
    font-weight: 600;
    line-height: 1.3;
}

.sc-calculator__subtitle {
    font-size: 0.8125rem;
    opacity: 0.85;
}

.sc-calculator__body {
    background: var(--sc-bg);
    border: 1px solid var(--sc-border);
    border-top: none;
    border-radius: 0 0 var(--sc-radius) var(--sc-radius);
    padding: var(--sc-spacing);
    box-shadow: var(--sc-shadow);
}

/* ============================================================
   Form Fields
   ============================================================ */
.sc-calculator__field {
    margin-bottom: 12px;
}

.sc-calculator__label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--sc-text-muted);
    margin-bottom: 4px;
}

.sc-calculator__input-group {
    display: flex;
    gap: 8px;
}

.sc-calculator__input {
    flex: 1;
    min-width: 0;
    padding: 10px 12px;
    font-size: 1rem;
    color: var(--sc-text);
    background: var(--sc-bg-secondary);
    border: 1px solid var(--sc-border);
    border-radius: var(--sc-radius-sm);
    outline: none;
    transition: border-color 0.15s ease;
    font-family: var(--sc-font);
}

.sc-calculator__input:focus {
    border-color: var(--sc-primary);
    box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.15);
}

.sc-calculator__input::placeholder {
    color: var(--sc-text-muted);
    opacity: 0.6;
}

.sc-calculator__input--result {
    background: var(--sc-bg-secondary);
    font-weight: 600;
    cursor: default;
}

.sc-calculator__select {
    width: 140px;
    flex-shrink: 0;
    padding: 10px 8px;
    font-size: 0.875rem;
    color: var(--sc-text);
    background: var(--sc-bg-secondary);
    border: 1px solid var(--sc-border);
    border-radius: var(--sc-radius-sm);
    outline: none;
    cursor: pointer;
    font-family: var(--sc-font);
}

.sc-calculator__select:focus {
    border-color: var(--sc-primary);
}

/* Remove number input spinners */
.sc-calculator__input[type="number"]::-webkit-outer-spin-button,
.sc-calculator__input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
.sc-calculator__input[type="number"] {
    -moz-appearance: textfield;
}

/* ============================================================
   Swap Button
   ============================================================ */
.sc-calculator__swap {
    display: flex;
    justify-content: center;
    margin: 4px 0;
}

.sc-calculator__swap-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    border: 1px solid var(--sc-border);
    border-radius: 50%;
    background: var(--sc-bg);
    color: var(--sc-text-muted);
    cursor: pointer;
    transition: all 0.15s ease;
}

.sc-calculator__swap-btn:hover {
    color: var(--sc-primary);
    border-color: var(--sc-primary);
    background: var(--sc-bg-secondary);
}

.sc-calculator__swap-btn:active {
    transform: scale(0.95);
}

/* ============================================================
   Formula Display
   ============================================================ */
.sc-calculator__formula {
    font-size: 0.8125rem;
    color: var(--sc-text-muted);
    text-align: center;
    padding: 8px;
    background: var(--sc-bg-secondary);
    border-radius: var(--sc-radius-sm);
    margin-bottom: 12px;
    min-height: 1.5em;
}

/* ============================================================
   Error Message
   ============================================================ */
.sc-calculator__error {
    font-size: 0.8125rem;
    color: var(--sc-error);
    text-align: center;
    min-height: 1.25em;
    margin-bottom: 8px;
}

/* ============================================================
   Calculate Button
   ============================================================ */
.sc-calculator__btn {
    display: block;
    width: 100%;
    padding: 12px;
    font-size: 1rem;
    font-weight: 600;
    color: #ffffff;
    background: var(--sc-primary);
    border: none;
    border-radius: var(--sc-radius-sm);
    cursor: pointer;
    transition: background-color 0.15s ease;
    font-family: var(--sc-font);
}

.sc-calculator__btn:hover {
    background: var(--sc-primary-hover);
}

.sc-calculator__btn:active {
    transform: scale(0.99);
}

/* ============================================================
   Responsive - Tablet
   ============================================================ */
@media (max-width: 768px) {
    .sc-calculator {
        --sc-spacing: 14px;
        max-width: 100%;
    }

    .sc-calculator__select {
        width: 120px;
        font-size: 0.8125rem;
    }
}

/* ============================================================
   Responsive - Mobile
   ============================================================ */
@media (max-width: 480px) {
    .sc-calculator {
        --sc-spacing: 12px;
    }

    .sc-calculator__input-group {
        flex-direction: column;
        gap: 6px;
    }

    .sc-calculator__select {
        width: 100%;
    }

    .sc-calculator__input,
    .sc-calculator__select {
        min-height: 44px;
        font-size: 1rem;
    }

    .sc-calculator__btn {
        min-height: 48px;
        font-size: 1.0625rem;
    }

    .sc-calculator__title {
        font-size: 1rem;
    }
}

/* ============================================================
   Responsive - Large screens
   ============================================================ */
@media (min-width: 1200px) {
    .sc-calculator {
        max-width: 460px;
    }
}