/* ===================================
   Medicare Coverage Lookup - Styles
   Following brandbook.md specifications
   =================================== */

/* CSS Custom Properties (Variables) */
:root {
    /* Primary Colors */
    --color-primary: #0066cc;
    --color-primary-dark: #003d7a;
    --color-primary-light: #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-bg-light: #f8f9fa;
    --color-gray: #6c757d;
    --color-gray-dark: #343a40;
    --color-border: #dee2e6;

    /* Document Type Badge Colors */
    --color-article: #17a2b8;
    --color-lcd: #28a745;
    --color-ncd: #6f42c1;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

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

    --font-size-base: 1rem;
    --font-size-small: 0.875rem;
    --font-size-tiny: 0.75rem;
    --font-size-h1: 2rem;
    --font-size-h2: 1.5rem;
    --font-size-h3: 1.25rem;

    --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;

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

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

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-focus: 0 0 0 0.2rem rgba(0, 102, 204, 0.25);
}

/* ===================================
   Reset & Base Styles
   =================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-gray-dark);
    background-color: var(--color-bg-light);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--space-sm) var(--space-md);
    text-decoration: none;
    z-index: 100;
}

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

/* ===================================
   Layout Components
   =================================== */

.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.main {
    flex: 1;
    padding: var(--space-xl) 0;
}

/* ===================================
   Header
   =================================== */

.header {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: var(--space-xl) 0;
    box-shadow: var(--shadow-sm);
}

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

.header__subtitle {
    font-size: var(--font-size-base);
    opacity: 0.95;
    font-weight: var(--font-weight-normal);
}

/* ===================================
   Cards
   =================================== */

.card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    padding: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.section-heading {
    font-size: var(--font-size-h2);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary-dark);
    margin-bottom: var(--space-lg);
    line-height: var(--line-height-tight);
}

/* ===================================
   Form Styles
   =================================== */

.search-form {
    width: 100%;
}

.form-row {
    display: grid;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-label {
    font-size: var(--font-size-small);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-dark);
    margin-bottom: var(--space-sm);
    line-height: var(--line-height-dense);
}

.required {
    color: var(--color-error);
    margin-left: var(--space-xs);
}

.optional {
    color: var(--color-gray);
    font-weight: var(--font-weight-normal);
}

.form-input,
.form-select {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: var(--color-white);
    color: var(--color-gray-dark);
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
    line-height: var(--line-height-dense);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-focus);
}

.form-input::placeholder {
    color: var(--color-gray);
    opacity: 0.7;
}

.form-select {
    cursor: pointer;
    min-height: 38px;
}

.form-help {
    font-size: var(--font-size-tiny);
    color: var(--color-gray);
    margin-top: var(--space-xs);
}

.form-error {
    font-size: var(--font-size-small);
    color: var(--color-error);
    margin-top: var(--space-xs);
    display: none;
}

.form-error.active {
    display: block;
}

.form-input.error,
.form-select.error {
    border-color: var(--color-error);
}

/* ===================================
   Buttons
   =================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    font-family: var(--font-family);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    line-height: var(--line-height-dense);
}

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

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

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

.btn:disabled {
    background-color: var(--color-border);
    color: var(--color-gray);
    cursor: not-allowed;
    opacity: 0.6;
}

.btn__spinner {
    display: none;
    width: 16px;
    height: 16px;
    border: 2px solid var(--color-white);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.btn.loading .btn__spinner {
    display: block;
}

.btn.loading .btn__text {
    margin-right: var(--space-xs);
}

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

/* ===================================
   Results Section
   =================================== */

.results-section {
    margin-top: var(--space-lg);
}

.results-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    padding: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.results-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 2px solid var(--color-border);
}

.results-badge {
    padding: 0.25rem 0.75rem;
    font-size: var(--font-size-tiny);
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    border-radius: var(--border-radius-pill);
    color: var(--color-white);
    letter-spacing: 0.05em;
}

.results-badge--article {
    background-color: var(--color-article);
}

.results-badge--lcd {
    background-color: var(--color-lcd);
}

.results-badge--ncd {
    background-color: var(--color-ncd);
}

.results-id {
    font-family: var(--font-family-mono);
    font-size: 1.125rem;
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.05em;
    color: var(--color-primary-dark);
}

.results-data {
    display: grid;
    gap: var(--space-md);
}

.data-item {
    display: grid;
    grid-template-columns: minmax(150px, 200px) 1fr;
    gap: var(--space-md);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-bg-light);
}

.data-item:last-child {
    border-bottom: none;
}

.data-item__key {
    font-size: var(--font-size-small);
    font-weight: var(--font-weight-bold);
    color: var(--color-gray);
}

.data-item__value {
    font-size: var(--font-size-base);
    color: var(--color-gray-dark);
    word-break: break-word;
}

.data-item__value--mono {
    font-family: var(--font-family-mono);
}

.data-nested {
    background-color: var(--color-bg-light);
    border-radius: var(--border-radius);
    padding: var(--space-md);
    margin-top: var(--space-sm);
}

/* ===================================
   Messages (Error, Success, Info)
   =================================== */

.message {
    padding: var(--space-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: start;
    gap: var(--space-md);
}

.message--error {
    background-color: #f8d7da;
    border-left: 4px solid var(--color-error);
    color: #721c24;
}

.message--success {
    background-color: #d4edda;
    border-left: 4px solid var(--color-success);
    color: #155724;
}

.message--info {
    background-color: #d1ecf1;
    border-left: 4px solid var(--color-info);
    color: #0c5460;
}

.message__icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.message__content {
    flex: 1;
}

.message__title {
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-xs);
}

/* ===================================
   Loading States
   =================================== */

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

.loading-overlay {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    padding: var(--space-xl);
    text-align: center;
}

/* ===================================
   Contractors Section
   =================================== */

.contractors-section {
    margin-top: var(--space-xl);
}

.contractors-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: transparent;
    border: none;
    padding: var(--space-md) 0;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-primary);
    cursor: pointer;
    transition: color var(--transition-normal);
}

.contractors-toggle:hover {
    color: var(--color-primary-hover);
}

.contractors-toggle__icon {
    transition: transform var(--transition-normal);
}

.contractors-toggle[aria-expanded="true"] .contractors-toggle__icon {
    transform: rotate(180deg);
}

.contractors-list {
    margin-top: var(--space-md);
}

.contractors-list__loading {
    text-align: center;
    padding: var(--space-xl);
    color: var(--color-gray);
}

.contractors-grid {
    display: grid;
    gap: var(--space-md);
    margin-top: var(--space-md);
}

.contractor-card {
    background: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--space-md);
    transition: border-color var(--transition-normal);
}

.contractor-card:hover {
    border-color: var(--color-primary-light);
}

.contractor-card__name {
    font-weight: var(--font-weight-bold);
    color: var(--color-primary-dark);
    margin-bottom: var(--space-xs);
}

.contractor-card__id {
    font-family: var(--font-family-mono);
    font-size: var(--font-size-small);
    color: var(--color-gray);
}

/* ===================================
   Footer
   =================================== */

.footer {
    background-color: var(--color-gray-dark);
    color: var(--color-white);
    padding: var(--space-lg) 0;
    margin-top: auto;
}

.footer__text {
    font-size: var(--font-size-small);
    text-align: center;
    margin-bottom: var(--space-xs);
}

.footer__text--small {
    font-size: var(--font-size-tiny);
    opacity: 0.8;
}

.footer__link {
    color: var(--color-primary-light);
    text-decoration: underline;
    transition: opacity var(--transition-fast);
}

.footer__link:hover {
    opacity: 0.8;
}

.status-indicator {
    font-weight: var(--font-weight-medium);
}

.status-indicator--online {
    color: var(--color-success);
}

.status-indicator--offline {
    color: var(--color-error);
}

/* ===================================
   Responsive Design
   =================================== */

/* Mobile (< 768px) - default styles above */

/* Tablet (768px - 1024px) */
@media (min-width: 768px) {
    .container {
        padding: 0 var(--space-xl);
    }

    .form-row {
        grid-template-columns: 1fr 1fr;
    }

    .form-group:nth-child(3) {
        grid-column: 1 / -1;
    }

    .contractors-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Desktop (> 1024px) */
@media (min-width: 1024px) {
    .form-row {
        grid-template-columns: 2fr 2fr 1fr;
    }

    .form-group:nth-child(3) {
        grid-column: auto;
    }

    .contractors-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .data-item {
        grid-template-columns: minmax(180px, 250px) 1fr;
    }
}

/* ===================================
   Print Styles
   =================================== */

@media print {
    .header,
    .footer,
    .search-section,
    .contractors-section {
        display: none;
    }

    .results-card {
        box-shadow: none;
        border: 1px solid #000;
        page-break-inside: avoid;
    }
}

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

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

/* Reduced motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}