/**
 * Legal & Resource Pages - Advanced Enhancement Layer
 * CRT scanlines, vignette, scroll reveal, reading progress, back-to-top
 * Shared across: privacy, terms, editorial-policy, media-literacy-guide, fact-checking-tips, educational-resources
 */

/* ==========================================================================
   CRT Overlay
   ========================================================================== */

.crt-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
}

.crt-overlay::before {
    content: '';
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 0, 0, 0.03) 2px,
        rgba(0, 0, 0, 0.03) 4px
    );
}

.crt-overlay::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(
        ellipse at center,
        transparent 0%,
        transparent 60%,
        rgba(0, 0, 0, 0.4) 100%
    );
}

/* ==========================================================================
   Particles & Matrix Rain (base styles - JS creates content)
   ========================================================================== */

.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    opacity: 0.1;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(74, 144, 226, 0.6);
    border-radius: 50%;
    animation: lrFloat 6s ease-in-out infinite;
}

@keyframes lrFloat {
    0%, 100% { transform: translateY(0px) rotate(0deg); opacity: 0.3; }
    50% { transform: translateY(-20px) rotate(180deg); opacity: 1; }
}

.matrix-rain {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    opacity: 0.04;
}

.matrix-character {
    position: absolute;
    color: rgba(74, 144, 226, 0.3);
    font-family: monospace;
    font-size: 14px;
    animation: lrMatrixFall 3s linear infinite;
}

@keyframes lrMatrixFall {
    0% { transform: translateY(-100px); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(100vh); opacity: 0; }
}

/* ==========================================================================
   Scroll Reveal
   ========================================================================== */

.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }
.reveal-delay-5 { transition-delay: 0.4s; }
.reveal-delay-6 { transition-delay: 0.48s; }

/* ==========================================================================
   Reading Progress Bar
   ========================================================================== */

.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-cyan, #06B6D4) 0%, var(--accent-blue, #3B82F6) 100%);
    z-index: 10001;
    transform-origin: left;
    transition: transform 0.1s ease-out;
}

/* ==========================================================================
   Back to Top Button
   ========================================================================== */

.back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-cyan, #06B6D4) 0%, var(--accent-blue, #3B82F6) 100%);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
    z-index: 9998;
    box-shadow: 0 4px 20px rgba(6, 182, 212, 0.3);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    box-shadow: 0 6px 28px rgba(6, 182, 212, 0.5);
    transform: translateY(-2px);
}

.back-to-top svg,
.scroll-to-top svg {
    width: 24px;
    height: 24px;
}

/* Legacy scroll-to-top (privacy etc) - same styling */
.scroll-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-cyan, #06B6D4) 0%, var(--accent-blue, #3B82F6) 100%);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
    z-index: 9998;
    box-shadow: 0 4px 20px rgba(6, 182, 212, 0.3);
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-to-top:hover {
    box-shadow: 0 6px 28px rgba(6, 182, 212, 0.5);
    transform: translateY(-2px);
}

/* ==========================================================================
   Animated Section Borders (legal-section, resource-section)
   ========================================================================== */

.legal-section.reveal,
.resource-section.reveal,
.resource-card.reveal {
    position: relative;
}

.legal-section::before,
.resource-section::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, var(--accent-cyan, #06B6D4), var(--accent-blue, #3B82F6), var(--accent-cyan, #06B6D4));
    background-size: 200% 200%;
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    animation: lrBorderShift 4s ease-in-out infinite;
}

.legal-section:hover::before,
.resource-section:hover::before {
    opacity: 0.6;
}

@keyframes lrBorderShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

/* Section hover glow */
.legal-section:hover,
.resource-section:hover,
.resource-card:hover {
    box-shadow: 0 8px 40px rgba(6, 182, 212, 0.15);
}

/* ==========================================================================
   Page-specific accent overrides (optional - set on body)
   ========================================================================== */

body[data-page-accent="privacy"] { --page-accent: #4A90E2; }
body[data-page-accent="terms"] { --page-accent: #2ECC71; }
body[data-page-accent="editorial"] { --page-accent: #9B59B6; }
body[data-page-accent="media-literacy"] { --page-accent: #06B6D4; }
body[data-page-accent="fact-checking"] { --page-accent: #F59E0B; }
body[data-page-accent="educational"] { --page-accent: #4FACFE; }

/* Active TOC link */
.legal-quick-ref a.active,
.resource-nav a.active {
    color: var(--color-primary, #4A90E2) !important;
    background: rgba(74, 144, 226, 0.15) !important;
    font-weight: 600;
}