/* ==========================================================================
   Nasal Cripple - Sitewide Modern Vanilla CSS Design System
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens & Theme Color Palette
   -------------------------------------------------------------------------- */
:root {
    /* Color Palette - Light Theme Default (High Contrast) */
    --bg-main: #edf2f7;
    --bg-surface: #ffffff;
    --bg-surface-elevated: #ffffff;
    --bg-header: rgba(15, 23, 42, 0.92);
    
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    --text-inverse: #f8fafc;
    
    --accent-primary: #0284c7;
    --accent-primary-hover: #0369a1;
    --accent-gradient: linear-gradient(135deg, #0284c7 0%, #0d9488 100%);
    --accent-glow: rgba(2, 132, 199, 0.25);
    
    --border-color: #cbd5e1;
    --border-color-hover: #94a3b8;
    
    /* Card & Modal Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 6px 12px -2px rgba(0, 0, 0, 0.1), 0 3px 6px -3px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 20px -4px rgba(0, 0, 0, 0.12), 0 6px 8px -4px rgba(0, 0, 0, 0.08);
    --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.15);
    
    /* Typography Tokens */
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Radius & Spacing */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
}

/* Dark Theme Overrides - High Contrast OS Preference */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-main: #090d16;
        --bg-surface: #1e293b;
        --bg-surface-elevated: #334155;
        --bg-header: rgba(9, 13, 22, 0.95);
        
        --text-primary: #f8fafc;
        --text-secondary: #cbd5e1;
        --text-muted: #94a3b8;
        --text-inverse: #f8fafc;
        
        --accent-primary: #38bdf8;
        --accent-primary-hover: #0ea5e9;
        --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #2dd4bf 100%);
        --accent-glow: rgba(56, 189, 248, 0.3);
        
        --border-color: #334155;
        --border-color-hover: #475569;
        
        --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.4);
        --shadow-md: 0 6px 12px rgba(0, 0, 0, 0.45);
        --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.5);
    }
}

/* --------------------------------------------------------------------------
   2. Reset & Core Typography
   -------------------------------------------------------------------------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    height: 100%;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100%;
    padding-top: 66px;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.25;
    margin-bottom: 0.75rem;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.15rem; }

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-primary-hover);
    text-decoration: underline;
}

/* --------------------------------------------------------------------------
   3. Layout Grid & Containers
   -------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.main-layout {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    padding: 0;
}

.content-column {
    flex: 1;
    min-width: 0;
}

.sidebar-column {
    width: 180px;
    flex-shrink: 0;
    position: sticky;
    top: 66px;
    align-self: flex-start;
}

@media (max-width: 850px) {
    .main-layout {
        flex-direction: column;
    }
    .sidebar-column {
        width: 100%;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 16px;
    }
}

/* --------------------------------------------------------------------------
   4. Header & Navigation (Glassmorphism Header)
   -------------------------------------------------------------------------- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 46px;
    background-color: var(--bg-header);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
    display: flex;
    align-items: center;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 800;
    color: #ffffff;
    text-decoration: none;
}

.brand-link img {
    height: 24px;
    width: auto;
}

.nav-menu {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 2px;
}

.nav-link-item {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    font-size: 0.85rem;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.85);
    border-radius: var(--radius-sm);
    text-decoration: none;
    white-space: nowrap;
    transition: all var(--transition-fast);
}

.nav-link-item:hover, .nav-link-item.active {
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.15);
    text-decoration: none;
}

.nav-toggle-btn {
    display: none;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: #ffffff;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.nav-toggle-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

@media (max-width: 700px) {
    .nav-toggle-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    #navbar {
        display: none;
        position: absolute;
        top: 46px;
        left: 0;
        right: 0;
        background-color: var(--bg-header);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-bottom: 1px solid rgba(255, 255, 255, 0.15);
        padding: 12px 18px;
        box-shadow: var(--shadow-glass);
    }

    #navbar.show-mobile-nav {
        display: block;
        animation: fadeIn var(--transition-fast);
    }

    .nav-menu {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .nav-link-item {
        width: 100%;
        padding: 10px 14px;
        font-size: 1rem;
    }

    .theme-toggle-btn {
        width: 100%;
        justify-content: center;
        padding: 10px 14px;
        margin-top: 4px;
    }
}

/* --------------------------------------------------------------------------
   5. Cards & Elevated Containers
   -------------------------------------------------------------------------- */
.card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 18px 20px;
    margin-bottom: 12px;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.card:hover {
    border-color: var(--border-color-hover);
    box-shadow: var(--shadow-md);
}

.card-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.card-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 10px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
}

.card-summary {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: 8px;
}

/* --------------------------------------------------------------------------
   6. Buttons & Badges
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 18px;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--accent-gradient);
    color: #ffffff;
    border: none;
    box-shadow: 0 2px 8px var(--accent-glow);
}

.btn-primary:hover {
    opacity: 0.92;
    transform: translateY(-1px);
    text-decoration: none;
    color: #ffffff;
}

.btn-secondary {
    background-color: var(--bg-surface-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    text-decoration: none;
}

.badge, .tag-badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    background-color: rgba(2, 132, 199, 0.12);
    color: var(--accent-primary);
    border: 1px solid rgba(2, 132, 199, 0.25);
    margin-right: 6px;
    margin-bottom: 4px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.badge:hover, .tag-badge:hover {
    background-color: var(--accent-primary);
    color: #ffffff;
    text-decoration: none;
}

/* --------------------------------------------------------------------------
   7. Form Controls & Dialog Overlays
   -------------------------------------------------------------------------- */
.form-control, .input-field, .select-field, textarea {
    width: 100%;
    padding: 10px 14px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    background-color: var(--bg-surface);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus, .input-field:focus, .select-field:focus, textarea:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* --------------------------------------------------------------------------
   8. Dropdown Popovers
   -------------------------------------------------------------------------- */
.dropdown-container {
    position: relative;
    display: inline-block;
}

.dropdown-menu-custom {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    min-width: 200px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-glass);
    padding: 6px;
    z-index: 2000;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.dropdown-menu-custom.show {
    display: block;
    animation: fadeIn var(--transition-fast);
}

.dropdown-item-custom {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 8px 12px;
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-align: left;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.dropdown-item-custom:hover, .dropdown-item-custom.active {
    background-color: var(--accent-primary);
    color: #ffffff;
}

/* --------------------------------------------------------------------------
   9. Modern Search Component
   -------------------------------------------------------------------------- */
.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
}

.search-input-wrapper .search-icon {
    position: absolute;
    left: 12px;
    color: var(--text-muted);
    font-size: 0.85rem;
    pointer-events: none;
}

.search-input-wrapper input[type="search"] {
    padding-left: 32px;
    padding-right: 30px;
    height: 32px;
    font-size: 0.82rem;
    border-radius: var(--radius-full);
    background-color: var(--bg-main);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    width: 100%;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input-wrapper input[type="search"]::-webkit-search-cancel-button {
    -webkit-appearance: none;
    appearance: none;
}

.search-input-wrapper input[type="search"]:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* --------------------------------------------------------------------------
   10. Native HTML5 Modal Dialog System
   -------------------------------------------------------------------------- */
dialog.modal-dialog-custom {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    margin: 0;
    width: 90%;
    max-width: 540px;
    max-height: 85vh;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background-color: var(--bg-surface);
    color: var(--text-primary);
    padding: 24px;
    box-shadow: var(--shadow-glass);
    z-index: 3000;
    overflow-y: auto;
}

dialog.modal-dialog-custom::backdrop {
    background-color: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
    margin-bottom: 16px;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0;
    color: var(--text-primary);
}

.close-btn {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    line-height: 1;
    transition: color var(--transition-fast);
}

.close-btn:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 8px 0 16px 0;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 10px;
    border-top: 1px solid var(--border-color);
    padding-top: 14px;
    margin-top: 16px;
}