/* ============================================
   Vortex of a Digital Kind — Design System
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    /* Colors — dark theme */
    --color-bg: #0a0a0f;
    --color-bg-elevated: #12121a;
    --color-bg-card: #1a1a25;
    --color-bg-input: #1e1e2a;
    --color-surface: #22222e;

    --color-text: #e4e4ed;
    --color-text-secondary: #9999aa;
    --color-text-muted: #666677;

    --color-primary: #6366f1;
    --color-primary-hover: #818cf8;
    --color-primary-glow: rgba(99, 102, 241, 0.25);

    --color-accent: #a78bfa;
    --color-success: #34d399;
    --color-error: #f87171;
    --color-warning: #fbbf24;
    --color-danger: #ef4444;

    --color-border: #2a2a3a;
    --color-border-focus: #6366f1;

    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;

    --leading-tight: 1.25;
    --leading-normal: 1.6;
    --leading-relaxed: 1.75;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* Layout */
    --container-max: 1200px;
    --content-narrow: 720px;

    /* Borders */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px var(--color-primary-glow);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}


/* --- Reset & Base --- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img, svg {
    display: block;
    max-width: 100%;
}

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

a:hover {
    color: var(--color-primary-hover);
}

a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: var(--color-bg-input);
    padding: 0.15em 0.4em;
    border-radius: var(--radius-sm);
}

/* --- Skip Link --- */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-md);
    background: var(--color-primary);
    color: white;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    z-index: 1000;
    font-weight: 500;
}

.skip-link:focus {
    top: var(--space-md);
}


/* --- Layout --- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.content-narrow {
    max-width: var(--content-narrow);
    margin: 0 auto;
}


/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: var(--leading-tight);
    color: var(--color-text);
    margin-bottom: var(--space-md);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-2xl); margin-top: var(--space-2xl); }
h3 { font-size: var(--text-xl); margin-top: var(--space-xl); }

p {
    margin-bottom: var(--space-md);
}

ul, ol {
    margin-bottom: var(--space-md);
    padding-left: var(--space-xl);
}

li {
    margin-bottom: var(--space-xs);
}

strong {
    font-weight: 600;
}

small {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}


/* --- Header --- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md) 0;
}

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

.site-logo {
    color: var(--color-text);
    font-weight: 700;
    font-size: var(--text-lg);
    letter-spacing: -0.02em;
}

.site-logo:hover {
    color: var(--color-primary);
}

.site-nav ul {
    display: flex;
    gap: var(--space-lg);
    list-style: none;
    padding: 0;
    margin: 0;
}

.site-nav a {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    padding: var(--space-xs) 0;
    transition: color var(--transition-fast);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
    color: var(--color-text);
}

.site-nav a[aria-current="page"] {
    border-bottom: 2px solid var(--color-primary);
}


/* --- Footer --- */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: var(--space-3xl) 0 var(--space-xl);
    margin-top: var(--space-4xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: var(--space-2xl);
    align-items: start;
    margin-bottom: var(--space-xl);
}

.footer-name {
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.footer-tagline {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.footer-legal ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-legal a {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.footer-legal a:hover {
    color: var(--color-text);
}

.footer-copyright {
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    text-align: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
}


/* --- Social Links --- */
.social-links {
    display: flex;
    gap: var(--space-md);
    align-items: center;
}

.social-link {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast), transform var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--color-surface);
}

.social-link:hover {
    color: var(--color-primary);
    transform: translateY(-2px);
    background: var(--color-bg-card);
}


/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    line-height: 1.5;
    min-height: 44px;
}

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

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

.btn-primary:hover {
    background: var(--color-primary-hover);
    color: white;
    box-shadow: var(--shadow-glow);
}

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

.btn-secondary:hover {
    background: var(--color-bg-card);
    color: var(--color-text);
    border-color: var(--color-text-muted);
}

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

.btn-danger:hover {
    background: #dc2626;
    color: white;
}


/* --- Forms --- */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    margin-bottom: var(--space-xs);
    color: var(--color-text);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    color: var(--color-text);
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    min-height: 44px;
}

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

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.form-group.has-error input,
.form-group.has-error textarea {
    border-color: var(--color-error);
}

.field-error {
    color: var(--color-error);
    font-size: var(--text-sm);
    margin-top: var(--space-xs);
}

.consent-group {
    padding: var(--space-md);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.checkbox-label {
    display: flex;
    gap: var(--space-sm);
    align-items: flex-start;
    font-size: var(--text-sm);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    margin-top: 3px;
    accent-color: var(--color-primary);
}


/* --- Status Cards --- */
.status-card {
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-xl);
}

.status-success {
    background: rgba(52, 211, 153, 0.1);
    border: 1px solid rgba(52, 211, 153, 0.3);
    color: var(--color-success);
}

.status-error {
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.3);
    color: var(--color-error);
}


/* --- Page Hero (inner pages) --- */
.page-hero {
    padding: var(--space-4xl) 0 var(--space-2xl);
    text-align: center;
}

.page-hero h1 {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-sm);
}

.page-subtitle {
    color: var(--color-text-secondary);
    font-size: var(--text-lg);
    max-width: 600px;
    margin: 0 auto;
}


/* --- Content Section --- */
.content-section {
    padding: var(--space-2xl) 0;
}


/* --- Legal Content --- */
.legal-content h2 {
    font-size: var(--text-xl);
    margin-top: var(--space-2xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.legal-content h2:first-of-type {
    border-top: none;
    padding-top: 0;
}

.legal-content h3 {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
}


/* --- Cookie Table --- */
.cookie-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-lg) 0;
    font-size: var(--text-sm);
}

.cookie-table th,
.cookie-table td {
    text-align: left;
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

.cookie-table th {
    color: var(--color-text-secondary);
    font-weight: 600;
}


/* --- Error Pages --- */
.error-page {
    padding: var(--space-4xl) 0;
    text-align: center;
}

.error-code {
    font-size: 8rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
    opacity: 0.3;
    margin-bottom: var(--space-md);
}


/* --- Utility Classes --- */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); font-size: var(--text-sm); margin-top: var(--space-xl); }


/* --- Responsive: Tablet (768px) --- */
@media (max-width: 768px) {
    :root {
        --text-4xl: 1.875rem;
        --text-5xl: 2.25rem;
    }

    .site-header .container {
        flex-direction: column;
        gap: var(--space-md);
    }

    .site-nav ul {
        gap: var(--space-md);
    }

    .site-nav a {
        padding: var(--space-sm) var(--space-md);
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
        text-align: center;
    }

    .footer-social .social-links {
        justify-content: center;
    }

    .footer-legal ul {
        display: flex;
        gap: var(--space-md);
        justify-content: center;
    }

    .hero-content {
        padding: var(--space-2xl) 0;
    }

    .topics-grid {
        grid-template-columns: 1fr;
    }
}

/* --- Responsive: Small phone (480px) --- */
@media (max-width: 480px) {
    :root {
        --text-4xl: 1.5rem;
        --text-5xl: 1.875rem;
        --text-3xl: 1.5rem;
        --text-2xl: 1.25rem;
    }

    .container {
        padding: 0 var(--space-md);
    }

    .page-hero {
        padding: var(--space-2xl) 0 var(--space-lg);
    }

    .content-section {
        padding: var(--space-lg) 0;
    }

    .legal-content h2 {
        font-size: var(--text-lg);
    }

    .btn {
        width: 100%;
    }
}