/**
 * Base Styles for Automator Colleague
 * 
 * Modern CSS following Platform First principles:
 * - CSS Variables for theming
 * - Semantic HTML structure
 * - Accessibility-first approach
 * - Mobile-first responsive design
 */

/* ========================================
   CSS Variables (Design Tokens)
   ======================================== */
:root {
    /* Colours */
    --colour-primary: #00b894; /* Professional Teal/Cyan */
    --colour-primary-dark: #009a7a;
    --colour-primary-light: #78d9c1;
    --colour-secondary: #6c757d;
    --colour-success: #2ecc71; /* Softer Green */
    --colour-danger: #e74c3c; /* Professional Red */
    --colour-warning: #f39c12; /* Professional Orange */
    --colour-info: #3498db; /* Calm Blue */
    
    /* Neutral colours */
    --colour-bg: #ffffff;
    --colour-bg-alt: #f8f9fa;
    --colour-text: #212529;
    --colour-text-muted: #6c757d;
    --colour-border: #dee2e6;
    
    /* Spacing scale */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Typography */
    --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --line-height-base: 1.5;
    
    /* Layout */
    --navbar-height: 4rem;
    --container-max-width: 1200px;
    --border-radius: 0.375rem;
    
    /* Transitions */
    --transition-base: 150ms ease-in-out;
    --transition-fast: 100ms ease-in-out;
}

/* ========================================
   Reset & Base Styles
   ======================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
}

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

body {
    margin: 0;
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--colour-text);
    background-color: var(--colour-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========================================
   Skip Link (Accessibility)
   ======================================== */
.skip-link {
    position: absolute;
    top: -100px;
    left: 0;
    z-index: 1000;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--colour-primary);
    color: var(--colour-bg);
    text-decoration: none;
    border-radius: 0 0 var(--border-radius) 0;
    transition: top var(--transition-base);
}

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

/* ========================================
   Navigation Bar
   ======================================== */
.navbar {
    background-color: var(--colour-bg);
    border-bottom: 1px solid var(--colour-border);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--navbar-height);
    gap: var(--spacing-lg);
}

/* Brand/Logo */
.navbar-brand {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--colour-text);
    text-decoration: none;
    transition: color var(--transition-base);
    white-space: nowrap;
}

.navbar-brand:hover,
.navbar-brand:focus {
    color: var(--colour-primary);
    text-decoration: none;
}

.brand-text {
    display: inline-block;
}

/* Mobile Menu Toggle */
.navbar-toggle {
    display: none; /* Hidden on desktop */
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    padding: var(--spacing-sm);
    cursor: pointer;
    width: 2.5rem;
    height: 2.5rem;
    justify-content: center;
    align-items: center;
}

.navbar-toggle-icon {
    width: 1.5rem;
    height: 2px;
    background-color: var(--colour-text);
    transition: all var(--transition-base);
    border-radius: 2px;
}

.navbar-toggle[aria-expanded="true"] .navbar-toggle-icon:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.navbar-toggle[aria-expanded="true"] .navbar-toggle-icon:nth-child(2) {
    opacity: 0;
}

.navbar-toggle[aria-expanded="true"] .navbar-toggle-icon:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

.navbar-toggle:focus {
    outline: 2px solid var(--colour-primary);
    outline-offset: 2px;
}

/* Navigation Menu */
.navbar-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--spacing-sm);
    align-items: center;
}

.navbar-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--colour-text);
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: all var(--transition-base);
    font-weight: 500;
}

.navbar-link:hover {
    background-color: var(--colour-bg-alt);
    color: var(--colour-primary);
}

.navbar-link:focus {
    outline: 2px solid var(--colour-primary);
    outline-offset: 2px;
}

.navbar-link.active {
    background-color: var(--colour-primary);
    color: var(--colour-bg);
}

.navbar-link[aria-current="page"] {
    background-color: var(--colour-primary);
    color: var(--colour-bg);
}

/* ========================================
   Main Content
   ======================================== */
main {
    flex: 1;
    padding: var(--spacing-xl) var(--spacing-md);
}

/* Messages Container */
.messages-container {
    max-width: var(--container-max-width);
    margin: 0 auto var(--spacing-lg);
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
    background-color: var(--colour-bg-alt);
    border-top: 1px solid var(--colour-border);
    padding: var(--spacing-lg) var(--spacing-md);
    margin-top: auto;
}

.footer-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    text-align: center;
    color: var(--colour-text-muted);
    font-size: var(--font-size-sm);
}

/* ========================================
   Responsive Design (Mobile First)
   ======================================== */
@media (max-width: 768px) {
    :root {
        --navbar-height: 3.5rem;
    }
    
    .navbar-toggle {
        display: flex;
    }
    
    .navbar-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--colour-bg);
        border-bottom: 1px solid var(--colour-border);
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        padding: var(--spacing-sm);
        gap: var(--spacing-xs);
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-base);
    }
    
    .navbar-menu[aria-expanded="true"] {
        max-height: 20rem;
    }
    
    .navbar-link {
        width: 100%;
        text-align: left;
        padding: var(--spacing-md);
    }
    
    main {
        padding: var(--spacing-lg) var(--spacing-md);
    }
}

/* ========================================
   High Contrast Mode Support
   ======================================== */
@media (prefers-contrast: high) {
    :root {
        --colour-border: #000000;
    }
    
    .navbar {
        border-bottom-width: 2px;
    }
}

/* ========================================
   Reduced Motion Support
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ========================================
   Úlohy — assignee picker & chips (KAN-2005)
   ======================================== */
.assignee-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: #fff;
    background: hsl(var(--hue, 210) 45% 45%);
}

.assignee-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.1rem 0.5rem 0.1rem 0.15rem;
    border-radius: 999px;
    background: #e9ecef;
    color: #212529;
    font-size: 0.85rem;
    line-height: 1.5rem;
    white-space: nowrap;
}

.assignee-chip__remove {
    padding: 0 0.15rem;
    margin-left: -0.15rem;
    line-height: 1;
    font-size: 1.05rem;
    color: #6c757d;
    cursor: pointer;
    border-radius: 50%;
}

.assignee-chip__remove:hover,
.assignee-chip__remove:focus-visible {
    color: #b02a37;
    outline: none;
    background: #dee2e6;
}

.assignee-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
}

.assignee-picker__trigger {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.25rem;
    height: auto;
    min-height: calc(1.5em + 0.75rem + 2px);
    padding-right: 2.25rem;
    cursor: pointer;
}

.assignee-picker__trigger:focus,
.assignee-picker__trigger.show {
    border-color: #86b7fe;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
    outline: 0;
}

.assignee-picker__trigger::after {
    display: none; /* Bootstrap's dropdown caret; the form-select arrow already signals it */
}

.assignee-picker__chips {
    display: contents;
}

.assignee-picker__placeholder {
    color: #6c757d;
}

.assignee-picker__menu {
    min-width: 17rem;
    padding: 0.35rem 0;
}

.assignee-picker__actions {
    display: flex;
    gap: 0.9rem;
    padding: 0.15rem 0.9rem 0.4rem;
    margin-bottom: 0.25rem;
    border-bottom: 1px solid #e9ecef;
    font-size: 0.8rem;
}

.assignee-picker__option {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    margin: 0;
    padding: 0.35rem 0.9rem;
    cursor: pointer;
}

.assignee-picker__option:hover {
    background: #f1f3f5;
}

.assignee-picker__option .form-check-input {
    flex: 0 0 auto;
    margin: 0;
}

.assignee-picker__option:has(.form-check-input:checked) {
    background: #e7f1ff;
}