/* ContentPulse.co.uk - Global Stylesheet & Design System */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* Declare Cascade Layers for predictable specificity */
@layer reset, base, theme, components, utilities;

@layer reset {
    /* Modern CSS Reset */
    *, *::before, *::after {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }

    html {
        -webkit-text-size-adjust: none;
        text-size-adjust: none;
    }

    body {
        min-block-size: 100vh;
        min-block-size: 100dvh;
        line-height: 1.5;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }

    img, picture, svg, video, canvas {
        display: block;
        max-inline-size: 100%;
        block-size: auto;
    }

    input, button, textarea, select {
        font: inherit;
    }

    a {
        color: inherit;
        text-decoration: none;
    }
}

@layer base {
    /* Define font variables */
    :root {
        --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
        --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
        
        /* Spacers */
        --space-2xs: 0.25rem;
        --space-xs: 0.5rem;
        --space-sm: 0.75rem;
        --space-md: 1rem;
        --space-lg: 1.5rem;
        --space-xl: 2rem;
        --space-2xl: 3rem;
        --space-3xl: 4.5rem;
        
        /* Transitions */
        --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
        --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        
        /* Radii */
        --radius-sm: 0.375rem;
        --radius-md: 0.5rem;
        --radius-lg: 0.75rem;
        --radius-xl: 1rem;
        --radius-pill: 9999px;
    }

    body {
        font-family: var(--font-body);
        font-size: 1rem;
        color: var(--color-text);
        background-color: var(--color-bg);
        transition: background-color var(--transition-normal), color var(--transition-normal);
        display: flex;
        flex-direction: column;
    }

    /* Headlines */
    h1, h2, h3, h4, h5, h6 {
        font-family: var(--font-display);
        font-weight: 700;
        line-height: 1.25;
        color: var(--color-heading);
        text-wrap: balance;
    }

    p {
        text-wrap: pretty;
        margin-block-end: var(--space-md);
        color: var(--color-text-muted);
    }

    /* Custom Focus Outline */
    :focus-visible {
        outline: 2px solid var(--color-accent);
        outline-offset: 4px;
        border-radius: var(--radius-sm);
    }
}

@layer theme {
    /* Design Tokens & Theme Definitions */
    :root {
        /* Supported color schemes */
        color-scheme: light dark;

        /* Raw Palette Tokens */
        --color-blue-50: #f0f5ff;
        --color-blue-500: #2563eb;
        --color-blue-600: #1d4ed8;
        --color-blue-900: #1e3a8a;
        --color-indigo-500: #6366f1;
        --color-indigo-600: #4f46e5;
        --color-indigo-900: #312e81;
        --color-slate-50: #f8fafc;
        --color-slate-100: #f1f5f9;
        --color-slate-200: #e2e8f0;
        --color-slate-300: #cbd5e1;
        --color-slate-600: #475569;
        --color-slate-800: #1e293b;
        --color-slate-900: #0f172a;
        --color-slate-950: #020617;
        
        --color-violet-glow: oklch(65% 0.25 300);
        --color-cyan-glow: oklch(75% 0.18 190);

        /* Default Light Theme overrides */
        --color-bg-light: var(--color-slate-50);
        --color-text-light: var(--color-slate-800);
        --color-heading-light: var(--color-slate-900);
        --color-text-muted-light: var(--color-slate-600);
        --color-border-light: var(--color-slate-200);
        --color-card-bg-light: #ffffff;
        --color-primary-light: var(--color-blue-600);
        --color-primary-hover-light: var(--color-blue-500);
        --color-accent-light: var(--color-indigo-600);

        /* Default Dark Theme overrides */
        --color-bg-dark: var(--color-slate-900);
        --color-text-dark: var(--color-slate-100);
        --color-heading-dark: #ffffff;
        --color-text-muted-dark: var(--color-slate-300);
        --color-border-dark: var(--color-slate-800);
        --color-card-bg-dark: var(--color-slate-800);
        --color-primary-dark: var(--color-blue-500);
        --color-primary-hover-dark: var(--color-blue-600);
        --color-accent-dark: var(--color-indigo-500);

        /* Resolve dynamic variables using light-dark() */
        --color-bg: light-dark(var(--color-bg-light), var(--color-bg-dark));
        --color-text: light-dark(var(--color-text-light), var(--color-text-dark));
        --color-heading: light-dark(var(--color-heading-light), var(--color-heading-dark));
        --color-text-muted: light-dark(var(--color-text-muted-light), var(--color-text-muted-dark));
        --color-border: light-dark(var(--color-border-light), var(--color-border-dark));
        --color-card-bg: light-dark(var(--color-card-bg-light), var(--color-card-bg-dark));
        
        --color-primary: light-dark(var(--color-primary-light), var(--color-primary-dark));
        --color-primary-hover: light-dark(var(--color-primary-hover-light), var(--color-primary-hover-dark));
        --color-accent: light-dark(var(--color-accent-light), var(--color-accent-dark));

        /* Global Header and Footer - ALWAYS DARK in both modes */
        --color-header-bg: var(--color-slate-950);
        --color-header-text: var(--color-slate-100);
        --color-header-text-muted: var(--color-slate-300);
        --color-header-border: var(--color-slate-800);
    }

    /* Map data-theme attribute to color-scheme property to trigger light-dark() evaluation */
    :root[data-theme="light"] {
        color-scheme: light;
    }
    :root[data-theme="dark"] {
        color-scheme: dark;
    }

    /* Fallback support for older browsers that do not support light-dark() */
    @supports not (color: light-dark(white, black)) {
        :root {
            --color-bg: var(--color-bg-light);
            --color-text: var(--color-text-light);
            --color-heading: var(--color-heading-light);
            --color-text-muted: var(--color-text-muted-light);
            --color-border: var(--color-border-light);
            --color-card-bg: var(--color-card-bg-light);
            --color-primary: var(--color-primary-light);
            --color-primary-hover: var(--color-primary-hover-light);
            --color-accent: var(--color-accent-light);
        }

        @media (prefers-color-scheme: dark) {
            :root:not([data-theme="light"]) {
                --color-bg: var(--color-bg-dark);
                --color-text: var(--color-text-dark);
                --color-heading: var(--color-heading-dark);
                --color-text-muted: var(--color-text-muted-dark);
                --color-border: var(--color-border-dark);
                --color-card-bg: var(--color-card-bg-dark);
                --color-primary: var(--color-primary-dark);
                --color-primary-hover: var(--color-primary-hover-dark);
                --color-accent: var(--color-accent-dark);
            }
        }

        :root[data-theme="dark"] {
            --color-bg: var(--color-bg-dark);
            --color-text: var(--color-text-dark);
            --color-heading: var(--color-heading-dark);
            --color-text-muted: var(--color-text-muted-dark);
            --color-border: var(--color-border-dark);
            --color-card-bg: var(--color-card-bg-dark);
            --color-primary: var(--color-primary-dark);
            --color-primary-hover: var(--color-primary-hover-dark);
            --color-accent: var(--color-accent-dark);
        }
    }
}

@layer components {
    /* Global Layout Structure */
    .site-wrapper {
        min-block-size: 100vh;
        min-block-size: 100dvh;
        display: flex;
        flex-direction: column;
    }

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

    .container {
        max-inline-size: 1200px;
        margin-inline: auto;
        padding-inline: var(--space-md);
    }

    /* Header styling */
    .site-header {
        background-color: var(--color-header-bg);
        color: var(--color-header-text);
        border-block-end: 1px solid var(--color-header-border);
        padding-block: var(--space-md);
        position: sticky;
        top: 0;
        z-index: 100;
        transition: background-color var(--transition-normal);
    }

    .header-container {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: var(--space-md);
    }

    .logo-link {
        display: flex;
        align-items: center;
        gap: var(--space-xs);
        font-family: var(--font-display);
        font-weight: 800;
        font-size: 1.4rem;
        letter-spacing: -0.02em;
        color: #ffffff;
    }

    .logo-icon {
        inline-size: 32px;
        block-size: 32px;
        object-fit: contain;
    }

    .nav-list {
        display: flex;
        list-style: none;
        gap: var(--space-lg);
    }

    .nav-link {
        font-weight: 500;
        font-size: 0.95rem;
        color: var(--color-header-text-muted);
        transition: color var(--transition-fast);
        padding-block: var(--space-2xs);
    }

    .nav-link:hover, .nav-link.active {
        color: #ffffff;
    }

    /* Header Search Autocomplete Component */
    .header-search {
        position: relative;
        inline-size: 240px;
    }

    .search-input {
        inline-size: 100%;
        padding: var(--space-xs) var(--space-md) var(--space-xs) 2.25rem;
        border: 1px solid var(--color-header-border);
        border-radius: var(--radius-pill);
        background-color: var(--color-slate-900);
        color: #ffffff;
        font-size: 0.85rem;
        outline: none;
        transition: border-color var(--transition-fast), inline-size var(--transition-normal);
    }

    .search-input:focus {
        border-color: var(--color-primary);
        background-color: var(--color-slate-950);
        box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
    }

    .search-icon-wrapper {
        position: absolute;
        inset-block-start: 50%;
        inset-inline-start: var(--space-sm);
        transform: translateY(-50%);
        pointer-events: none;
        color: var(--color-header-text-muted);
    }

    .search-icon-wrapper svg {
        inline-size: 16px;
        block-size: 16px;
    }

    /* Autocomplete suggestions */
    .autocomplete-dropdown {
        position: absolute;
        inset-block-start: calc(100% + var(--space-xs));
        inset-inline-end: 0;
        inline-size: 320px;
        background-color: var(--color-card-bg);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-lg);
        box-shadow: 0 10px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
        display: none;
        flex-direction: column;
        overflow: hidden;
        z-index: 110;
        animation: slideDown 0.18s ease-out;
    }

    @keyframes slideDown {
        from { transform: translateY(-5px); opacity: 0; }
        to { transform: translateY(0); opacity: 1; }
    }

    .autocomplete-item {
        padding: var(--space-sm) var(--space-md);
        font-size: 0.85rem;
        border-block-end: 1px solid var(--color-border);
        cursor: pointer;
        transition: background-color var(--transition-fast);
        display: flex;
        flex-direction: column;
        gap: var(--space-2xs);
    }

    .autocomplete-item:last-child {
        border-block-end: none;
    }

    .autocomplete-item:hover, .autocomplete-item.focused {
        background-color: light-dark(var(--color-slate-100), var(--color-slate-900));
        outline: none;
    }

    .autocomplete-title {
        font-weight: 600;
        color: var(--color-heading);
    }

    .autocomplete-category {
        font-size: 0.75rem;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        color: var(--color-primary);
        font-weight: 700;
    }

    /* Footer styling */
    .site-footer {
        background-color: var(--color-header-bg);
        color: var(--color-header-text);
        border-block-start: 1px solid var(--color-header-border);
        padding-block: var(--space-2xl) var(--space-lg);
        font-size: 0.9rem;
    }

    .footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr;
        gap: var(--space-xl);
        margin-block-end: var(--space-xl);
    }

    .footer-brand h4 {
        color: #ffffff;
        margin-block-end: var(--space-sm);
        font-size: 1.2rem;
    }

    .footer-col h5 {
        color: #ffffff;
        font-family: var(--font-display);
        margin-block-end: var(--space-md);
        font-size: 1rem;
        text-transform: uppercase;
        letter-spacing: 0.05em;
    }

    .footer-links {
        list-style: none;
        display: flex;
        flex-direction: column;
        gap: var(--space-xs);
    }

    .footer-link {
        color: var(--color-header-text-muted);
        transition: color var(--transition-fast);
    }

    .footer-link:hover {
        color: #ffffff;
    }

    .footer-bottom {
        border-block-start: 1px solid var(--color-header-border);
        padding-block-start: var(--space-lg);
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: var(--space-md);
        color: var(--color-header-text-muted);
        font-size: 0.8rem;
        text-align: center;
    }

    /* Theme Toggle Switch */
    .theme-toggle-container {
        display: flex;
        align-items: center;
        gap: var(--space-sm);
        background-color: var(--color-slate-900);
        padding: var(--space-2xs) var(--space-xs);
        border-radius: var(--radius-pill);
        border: 1px solid var(--color-header-border);
    }

    .theme-toggle-btn {
        background: none;
        border: none;
        color: var(--color-header-text-muted);
        padding: var(--space-xs);
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: var(--radius-pill);
        transition: background-color var(--transition-fast), color var(--transition-fast);
    }

    .theme-toggle-btn svg {
        inline-size: 16px;
        block-size: 16px;
        fill: currentColor;
    }

    .theme-toggle-btn:hover {
        color: #ffffff;
    }

    .theme-toggle-btn.active {
        background-color: var(--color-slate-800);
        color: #ffffff;
    }

    /* Buttons */
    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: var(--space-xs);
        padding: var(--space-sm) var(--space-lg);
        font-weight: 600;
        font-size: 0.95rem;
        border-radius: var(--radius-md);
        cursor: pointer;
        transition: transform var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
        border: none;
    }

    .btn:active {
        transform: scale(0.98);
    }

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

    .btn-primary:hover {
        background-color: var(--color-primary-hover);
        box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    }

    .btn-secondary {
        background-color: transparent;
        color: var(--color-heading);
        border: 1px solid var(--color-border);
    }

    .btn-secondary:hover {
        background-color: light-dark(var(--color-slate-100), var(--color-slate-800));
    }

    /* Card Styling */
    .card {
        background-color: var(--color-card-bg);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-lg);
        overflow: hidden;
        transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
        display: flex;
        flex-direction: column;
    }

    .card:hover {
        transform: translateY(-4px);
        box-shadow: 0 12px 24px -10px rgba(0,0,0,0.08), 0 8px 16px -8px rgba(0,0,0,0.08);
        border-color: var(--color-primary);
    }

    .card-img-wrapper {
        aspect-ratio: 16 / 9;
        position: relative;
        background-color: var(--color-slate-900);
        overflow: hidden;
    }

    .card-img {
        inline-size: 100%;
        block-size: 100%;
        object-fit: cover;
        transition: transform var(--transition-slow);
    }

    .card:hover .card-img {
        transform: scale(1.05);
    }

    .card-video-overlay {
        position: absolute;
        inset: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        background: rgba(0,0,0,0.3);
        opacity: 0.85;
        transition: opacity var(--transition-fast);
    }

    .card:hover .card-video-overlay {
        opacity: 1;
        background: rgba(0,0,0,0.25);
    }

    .play-icon-circle {
        inline-size: 48px;
        block-size: 48px;
        border-radius: 50%;
        background-color: var(--color-primary);
        color: #ffffff;
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: 0 4px 10px rgba(0,0,0,0.3);
        transition: transform var(--transition-fast), background-color var(--transition-fast);
    }

    .card:hover .play-icon-circle {
        transform: scale(1.1);
        background-color: var(--color-primary-hover);
    }

    .play-icon-circle svg {
        inline-size: 20px;
        block-size: 20px;
        fill: currentColor;
        margin-inline-start: 2px;
    }

    .card-content {
        padding: var(--space-md);
        display: flex;
        flex-direction: column;
        flex: 1;
    }

    .card-meta {
        display: flex;
        align-items: center;
        gap: var(--space-sm);
        font-size: 0.75rem;
        font-weight: 600;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        color: var(--color-primary);
        margin-block-end: var(--space-xs);
    }

    .card-date {
        color: var(--color-text-muted);
        font-weight: 400;
    }

    .card-title {
        font-size: 1.1rem;
        margin-block-end: var(--space-xs);
        transition: color var(--transition-fast);
    }

    .card:hover .card-title {
        color: var(--color-primary);
    }

    .card-desc {
        font-size: 0.9rem;
        line-height: 1.4;
        margin-block-end: var(--space-md);
        display: -webkit-box;
        -webkit-line-clamp: 3;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .card-link {
        margin-block-start: auto;
        font-weight: 600;
        font-size: 0.85rem;
        color: var(--color-accent);
        display: inline-flex;
        align-items: center;
        gap: var(--space-2xs);
    }

    .card-link svg {
        inline-size: 12px;
        block-size: 12px;
        transition: transform var(--transition-fast);
    }

    .card:hover .card-link svg {
        transform: translateX(3px);
    }

    /* Cookie Consent Banner */
    .cookie-banner {
        position: fixed;
        inset-block-end: var(--space-md);
        inset-inline-start: var(--space-md);
        max-inline-size: 420px;
        background-color: var(--color-card-bg);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-lg);
        box-shadow: 0 10px 30px -5px rgba(0,0,0,0.15), 0 8px 15px -8px rgba(0,0,0,0.15);
        padding: var(--space-md);
        z-index: 1000;
        display: none;
        flex-direction: column;
        gap: var(--space-md);
        animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

    @keyframes slideUp {
        from { transform: translateY(20px); opacity: 0; }
        to { transform: translateY(0); opacity: 1; }
    }

    .cookie-title {
        font-size: 1.05rem;
        font-weight: 700;
    }

    .cookie-text {
        font-size: 0.85rem;
        line-height: 1.4;
        margin-block-end: 0;
    }

    .cookie-actions {
        display: flex;
        gap: var(--space-sm);
        justify-content: flex-end;
    }

    .cookie-btn {
        padding: var(--space-xs) var(--space-md);
        font-size: 0.8rem;
    }
}

@layer utilities {
    /* Helper classes */
    .text-center { text-align: center; }
    .mt-xl { margin-block-start: var(--space-xl); }
    .mt-2xl { margin-block-start: var(--space-2xl); }
    .mb-md { margin-block-end: var(--space-md); }
    .mb-xl { margin-block-end: var(--space-xl); }
    
    .visually-hidden {
        position: absolute;
        width: 1px;
        height: 1px;
        padding: 0;
        margin: -1px;
        overflow: hidden;
        clip: rect(0, 0, 0, 0);
        white-space: nowrap;
        border: 0;
    }

    .grid-3 {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-lg);
    }

    .grid-2 {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
    }

    .glass-effect {
        backdrop-filter: blur(8px);
        background-color: rgba(255, 255, 255, 0.8);
    }
    
    :root[meta-color-scheme="dark"] .glass-effect {
        background-color: rgba(15, 23, 42, 0.8);
    }
}