/*
 * Deeparse - Medicare Document Analysis
 * Brand-compliant styles following brandbook.md specifications
 * Maintained by: frontend-brand-guardian agent
 */

/* ===========================
   CSS Custom Properties
   Based on brandbook color system, spacing, and typography
   =========================== */
:root {
    /* Primary Colors */
    --color-primary-blue: #0066cc;
    --color-dark-blue: #003d7a;
    --color-light-blue: #e6f2ff;
    --color-primary-hover: #0052a3;

    /* Semantic Colors */
    --color-success: #28a745;
    --color-warning: #ff9800;
    --color-error: #dc3545;
    --color-info: #17a2b8;

    /* Neutral Colors */
    --color-white: #ffffff;
    --color-light-gray: #f8f9fa;
    --color-medium-gray: #6c757d;
    --color-dark-gray: #343a40;
    --color-border: #dee2e6;

    /* Spacing (8px grid system) */
    --spacing-xs: 0.25rem;    /* 4px */
    --spacing-sm: 0.5rem;     /* 8px */
    --spacing-md: 1rem;       /* 16px */
    --spacing-lg: 1.5rem;     /* 24px */
    --spacing-xl: 2rem;       /* 32px */
    --spacing-2xl: 3rem;      /* 48px */

    /* Typography */
    --font-family-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-family-mono: "Courier New", Courier, monospace;

    --font-size-h1: 2rem;         /* 32px */
    --font-size-h2: 1.5rem;       /* 24px */
    --font-size-h3: 1.25rem;      /* 20px */
    --font-size-base: 1rem;       /* 16px */
    --font-size-small: 0.875rem;  /* 14px */
    --font-size-tiny: 0.75rem;    /* 12px */

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 600;
    --font-weight-heavy: 700;

    --line-height-tight: 1.2;
    --line-height-normal: 1.6;
    --line-height-dense: 1.4;

    /* Animation */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;

    /* Layout */
    --container-max-width: 1200px;
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
}

/* ===========================
   Reset and Base Styles
   =========================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-dark-gray);
    background-color: var(--color-light-gray);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===========================
   Layout Components
   =========================== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* Desktop padding - Brandbook specifies 2rem for desktop */
@media (min-width: 1024px) {
    .container {
        padding: var(--spacing-xl);
    }
}

/* ===========================
   Header
   =========================== */
.header {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
}

.header__title {
    font-size: var(--font-size-h1);
    font-weight: var(--font-weight-heavy);
    line-height: var(--line-height-tight);
    color: var(--color-dark-blue);
    margin-bottom: var(--spacing-sm);
}

.header__subtitle {
    font-size: var(--font-size-base);
    color: var(--color-medium-gray);
    font-weight: var(--font-weight-normal);
}

/* Mobile responsiveness */
@media (max-width: 768px) {
    .header__title {
        font-size: 1.5rem; /* 24px */
    }

    .header__subtitle {
        font-size: var(--font-size-small);
    }
}

/* ===========================
   Main Content
   =========================== */
.main-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* ===========================
   Card Component (Brandbook Pattern)
   =========================== */
.card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
    transition: box-shadow var(--transition-normal);
}

.card:hover {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.12);
}

.card__heading {
    font-size: var(--font-size-h2);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--color-dark-blue);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-light-blue);
}

.card--response {
    min-height: 200px;
}

/* Mobile responsiveness */
@media (max-width: 768px) {
    .card {
        padding: var(--spacing-md);
    }

    .card__heading {
        font-size: var(--font-size-h3);
    }
}

/* ===========================
   Form Components (Brandbook Pattern)
   =========================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group__label {
    display: block;
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-small);
    color: var(--color-dark-gray);
    margin-bottom: var(--spacing-sm);
}

/* Input Fields and Select Dropdowns - Following Brandbook Specifications */
.form-group__select,
.form-group__textarea {
    width: 100%;
    padding: 0.5rem 0.75rem; /* Brandbook: 8px 12px */
    font-size: var(--font-size-base);
    font-family: var(--font-family-primary);
    color: var(--color-dark-gray);
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
    line-height: var(--line-height-dense);
}

.form-group__select {
    min-height: 38px; /* Brandbook specification */
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23343a40' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2.5rem;
}

.form-group__textarea {
    resize: vertical;
    min-height: 120px;
}

/* Focus State - Brandbook: Border #0066cc, box-shadow with rgba */
.form-group__select:focus,
.form-group__textarea:focus {
    outline: none;
    border-color: var(--color-primary-blue);
    box-shadow: 0 0 0 0.2rem rgba(0, 102, 204, 0.25);
}

/* Disabled State */
.form-group__select:disabled,
.form-group__textarea:disabled {
    background-color: #e9ecef;
    color: var(--color-medium-gray);
    cursor: not-allowed;
    opacity: 0.6;
}

.form-group__help {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-tiny);
    color: var(--color-medium-gray);
}

/* ===========================
   Form Actions
   =========================== */
.form-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
}

/* ===========================
   Button Components (Brandbook Pattern)
   =========================== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem; /* Brandbook: 12px 24px */
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    font-family: var(--font-family-primary);
    line-height: var(--line-height-dense);
    text-align: center;
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    user-select: none;
}

.btn:focus {
    outline: 2px solid var(--color-primary-blue);
    outline-offset: 2px;
}

/* Primary Button - Brandbook Specifications */
.btn--primary {
    background-color: var(--color-primary-blue);
    color: var(--color-white);
}

.btn--primary:hover:not(:disabled) {
    background-color: var(--color-primary-hover);
    transform: translateY(-1px); /* Brandbook hover effect */
}

.btn--primary:active:not(:disabled) {
    background-color: var(--color-dark-blue);
    transform: translateY(0);
}

/* Secondary Button - Brandbook Specifications */
.btn--secondary {
    background-color: transparent;
    color: var(--color-primary-blue);
    border: 1px solid var(--color-primary-blue);
}

.btn--secondary:hover:not(:disabled) {
    background-color: var(--color-light-blue);
}

/* Disabled State - Brandbook Specifications */
.btn:disabled {
    background-color: #e9ecef;
    color: var(--color-medium-gray);
    cursor: not-allowed;
    opacity: 0.6;
    border-color: transparent;
}

.btn:disabled:hover {
    transform: none;
}

/* Mobile responsiveness */
@media (max-width: 768px) {
    .form-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}

/* ===========================
   Response Content Area
   =========================== */
.response-content {
    min-height: 100px;
}

.response-content__placeholder {
    color: var(--color-medium-gray);
    font-style: italic;
    text-align: center;
    padding: var(--spacing-xl);
}

.response-content__text {
    color: var(--color-dark-gray);
    line-height: var(--line-height-normal);
    white-space: pre-wrap;
}

/* ===========================
   Loading State (Brandbook Pattern)
   =========================== */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    gap: var(--spacing-md);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--color-light-gray);
    border-top-color: var(--color-primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-state__text {
    color: var(--color-medium-gray);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
}

/* ===========================
   Footer
   =========================== */
.footer {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-lg) 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.footer__text {
    font-size: var(--font-size-small);
    color: var(--color-medium-gray);
}

/* ===========================
   Accessibility Enhancements
   =========================== */

/* Skip to content link for keyboard users */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary-blue);
    color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* Focus visible for keyboard navigation */
:focus-visible {
    outline: 2px solid var(--color-primary-blue);
    outline-offset: 2px;
}

/* ===========================
   Utility Classes
   =========================== */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Message States (Success/Error) - Brandbook Pattern */
.message {
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    border-left: 4px solid;
    margin-bottom: var(--spacing-md);
}

.message--success {
    background-color: rgba(40, 167, 69, 0.1);
    border-color: var(--color-success);
    color: #155724;
}

.message--error {
    background-color: rgba(220, 53, 69, 0.1);
    border-color: var(--color-error);
    color: #721c24;
}

.message--info {
    background-color: rgba(23, 162, 184, 0.1);
    border-color: var(--color-info);
    color: #0c5460;
}