/*
 * Submit Page Components
 *
 * Page-specific styling for the NMR calculation submission page.
 * Uses design tokens from tokens.css and follows Phase 18 patterns.
 *
 * Layout: Two-column grid with form on left, preview on right.
 * Responsive: Collapses to single column at 900px with preview first.
 *
 * Key components:
 * - .submit-layout: Two-column responsive grid
 * - .form-group: Fieldset-style form sections with BEM naming
 * - .preview-card: Solid white background (like viewer-card) for 3D preview
 * - .required-indicator: Red asterisk for required fields
 * - .field-help: Descriptive text below form inputs
 */

@layer components {

    /* ===== Submit Layout ===== */
    /*
     * Two-column grid: form fields on left, molecule preview on right.
     * Preview column fixed at 350px for consistent canvas sizing.
     */
    .submit-layout {
        display: grid;
        grid-template-columns: 1fr 350px;
        gap: var(--space-xl);
        align-items: start;
    }

    @media (max-width: 900px) {
        .submit-layout {
            grid-template-columns: 1fr;
        }

        .submit-layout__preview {
            order: -1; /* Preview first on mobile */
        }
    }


    /* ===== Form Group ===== */
    /*
     * Fieldset-style form sections with consistent visual treatment.
     * Uses BEM naming: .form-group, .form-group__field
     */
    .form-group {
        border: 1px solid var(--color-border);
        border-radius: 0.5rem;
        padding: var(--space-lg);
        margin-bottom: var(--space-lg);
        background: var(--color-white);
    }

    .form-group legend {
        font-weight: 600;
        font-size: var(--text-lg);
        padding: 0 var(--space-sm);
        color: var(--color-text);
    }

    .form-group__field {
        margin-bottom: var(--space-md);
    }

    .form-group__field:last-child {
        margin-bottom: 0;
    }


    /* ===== Required Indicator ===== */
    /*
     * Red asterisk for required fields.
     * Placed after label text: <label>Field <span class="required-indicator">*</span></label>
     */
    .required-indicator {
        color: var(--color-error);
        margin-left: var(--space-xs);
    }


    /* ===== Field Help ===== */
    /*
     * Descriptive text below form inputs.
     * Smaller, muted text to avoid competing with labels.
     */
    .field-help {
        display: block;
        margin-top: var(--space-xs);
        font-size: var(--text-sm);
        color: var(--color-text-muted);
        line-height: 1.4;
    }


    /* ===== Form Instructions ===== */
    /*
     * Instructions at top of form explaining required fields.
     * E.g., "Fields marked with * are required"
     */
    .form-instructions {
        font-size: var(--text-sm);
        color: var(--color-text-muted);
        margin-bottom: var(--space-lg);
    }


    /* ===== Preview Card ===== */
    /*
     * CRITICAL: Uses solid white background instead of glass effect.
     * Same approach as viewer-card - glass/blur causes performance
     * issues with WebGL/3Dmol.js rendering.
     *
     * Sticky positioning keeps preview visible while scrolling form.
     */
    .preview-card {
        background: var(--color-white);
        border: 1px solid var(--color-border);
        border-radius: var(--glass-radius);
        box-shadow: var(--glass-shadow);
        padding: var(--space-lg);
        position: sticky;
        top: var(--space-lg);
    }

    .preview-card__title {
        font-size: var(--text-lg);
        font-weight: 600;
        margin: 0 0 var(--space-md) 0;
    }

    /*
     * Canvas container for molecule preview.
     * Square aspect ratio for consistent molecular display.
     */
    .preview-card__canvas {
        width: 100%;
        aspect-ratio: 1;
        background: var(--color-gray-50);
        border: 1px solid var(--color-gray-200);
        border-radius: var(--space-xs);
    }

    .preview-card__status {
        margin-top: var(--space-md);
        font-size: var(--text-sm);
        text-align: center;
    }

    /* Status variants for validation feedback */
    .preview-card__status--valid {
        color: var(--color-success);
    }

    .preview-card__status--invalid {
        color: var(--color-error);
    }

    .preview-card__status--empty {
        color: var(--color-text-muted);
    }


    /* ===== Submit Button ===== */
    /*
     * Full-width on mobile for easy touch targets.
     */
    .submit-form__button {
        margin-top: var(--space-lg);
    }

    @media (max-width: 600px) {
        .submit-form__button {
            width: 100%;
        }
    }


    /* ===== Advanced Options ===== */
    /*
     * Borderless variant for nested options within a form group.
     * Used for optional/advanced settings that don't need visual separation.
     */
    .form-group--advanced {
        border: none;
        padding: var(--space-md) 0 0 0;
        margin: 0;
        background: transparent;
    }

    .form-group--advanced legend {
        display: none;
    }

}