/* ===========================================
   logic.day - Pixel-Art Logic Forest
   Art-Deco + Pixel Aesthetic
   Horizontal Scroll Narrative
   =========================================== */

/* --- Palette --- */
:root {
    --deep-forest: #0B3D2E;
    --canopy: #1A6B4A;
    --fern: #3DA67A;
    --undergrowth: #7CAE8E;
    --deco-gold: #C5A55A;
    --parchment: #F4ECD8;
    --pixel-white: #FAFAF2;
    --logic-red: #8B2500;
    --logic-true: #00B86B;
}

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

html {
    overflow: hidden;
    height: 100%;
}

body {
    background: var(--deep-forest);
    color: var(--parchment);
    font-family: 'Silkscreen', cursive;
    font-size: 16px;
    line-height: 1.75;
    -webkit-font-smoothing: none;
    -moz-osx-font-smoothing: unset;
    overflow: hidden;
    height: 100%;
    image-rendering: pixelated;
}

/* --- Horizontal Scroll Container --- */
#scroll-container {
    display: flex;
    flex-direction: row;
    width: max-content;
    height: 100vh;
    overflow-x: scroll;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}

#scroll-container::-webkit-scrollbar {
    display: none;
}

#scroll-container {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

/* --- Panels --- */
.panel {
    width: 100vw;
    height: 100vh;
    flex-shrink: 0;
    scroll-snap-align: start;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--deep-forest);
    overflow: hidden;
    perspective: 1200px;
}

.panel-light {
    background: var(--parchment);
    color: var(--deep-forest);
}

.panel-content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    max-width: 900px;
    width: 90%;
    padding: 40px 20px;
}

/* --- Panel Labels --- */
.panel-label {
    font-family: 'Poiret One', cursive;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--deco-gold);
    display: block;
}

.panel-light .panel-label {
    color: var(--canopy);
}

/* --- Headlines --- */
.panel-title {
    font-family: 'Poiret One', cursive;
    font-size: clamp(2rem, 5vw, 4rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--deco-gold);
    text-shadow: 2px 2px 0px rgba(197, 165, 90, 0.3);
    text-align: center;
    position: relative;
}

.panel-light .panel-title {
    color: var(--deep-forest);
    text-shadow: 2px 2px 0px rgba(11, 61, 46, 0.15);
}

/* Sunburst behind title */
.panel-title::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 300px;
    height: 300px;
    transform: translate(-50%, -50%);
    background:
        repeating-conic-gradient(
            from 0deg,
            transparent 0deg,
            transparent 6.5deg,
            rgba(197, 165, 90, 0.06) 7deg,
            transparent 7.5deg,
            transparent 15deg
        );
    border-radius: 50%;
    pointer-events: none;
    z-index: -1;
}

/* --- Body Text --- */
.panel-body {
    max-width: 480px;
    text-align: center;
}

.panel-body p {
    margin-bottom: 12px;
    font-family: 'Silkscreen', cursive;
    font-size: 16px;
    line-height: 1.75;
    color: var(--parchment);
}

.panel-body-dark p {
    color: var(--deep-forest);
}

.true-val {
    color: var(--logic-true);
    font-family: 'Share Tech Mono', monospace;
    font-size: 14px;
    letter-spacing: 0.04em;
}

.false-val {
    color: var(--logic-red);
    font-family: 'Share Tech Mono', monospace;
    font-size: 14px;
    letter-spacing: 0.04em;
}

.logic-notation {
    font-family: 'Share Tech Mono', monospace;
    font-size: 14px;
    letter-spacing: 0.04em;
    color: var(--deco-gold);
    background: rgba(11, 61, 46, 0.5);
    padding: 8px 16px;
    border: 2px solid var(--deco-gold);
    border-width: 1px 2px 3px 2px;
    display: inline-block;
    margin-top: 8px;
}

.logic-notation-dark {
    color: var(--deep-forest);
    background: rgba(197, 165, 90, 0.15);
    border-color: var(--canopy);
}

/* --- Deco Dividers --- */
.deco-divider {
    width: 48px;
    height: 100vh;
    flex-shrink: 0;
    background: var(--deep-forest);
    position: relative;
    overflow: hidden;
}

.deco-divider::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 12px,
            var(--deco-gold) 12px,
            var(--deco-gold) 14px,
            transparent 14px,
            transparent 20px
        ),
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 8px,
            rgba(197, 165, 90, 0.3) 8px,
            rgba(197, 165, 90, 0.3) 10px,
            transparent 10px,
            transparent 16px
        ),
        repeating-linear-gradient(
            135deg,
            transparent,
            transparent 8px,
            rgba(197, 165, 90, 0.3) 8px,
            rgba(197, 165, 90, 0.3) 10px,
            transparent 10px,
            transparent 16px
        );
}

.deco-divider::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    transform: translate(-50%, -50%) rotate(45deg);
    background: var(--deco-gold);
    box-shadow:
        0 -32px 0 var(--deco-gold),
        0 32px 0 var(--deco-gold),
        0 -64px 0 var(--deco-gold),
        0 64px 0 var(--deco-gold);
}

/* --- Organic Blobs --- */
.blob {
    position: absolute;
    border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
    opacity: 0.08;
    z-index: 0;
    mix-blend-mode: overlay;
    pointer-events: none;
}

.blob-1 {
    width: 400px;
    height: 400px;
    background: var(--canopy);
    top: -80px;
    left: -60px;
    animation: blobDrift1 20s ease-in-out infinite alternate;
}

.blob-2 {
    width: 300px;
    height: 350px;
    background: var(--fern);
    bottom: -50px;
    right: -40px;
    animation: blobDrift2 18s ease-in-out infinite alternate;
}

.blob-3 {
    width: 350px;
    height: 280px;
    background: var(--canopy);
    top: 20%;
    right: 10%;
    animation: blobDrift3 22s ease-in-out infinite alternate;
}

.blob-4 {
    width: 250px;
    height: 300px;
    background: var(--fern);
    bottom: 10%;
    left: 5%;
    animation: blobDrift4 19s ease-in-out infinite alternate;
}

.blob-5 {
    width: 320px;
    height: 320px;
    background: var(--undergrowth);
    top: 40%;
    left: 30%;
    animation: blobDrift5 24s ease-in-out infinite alternate;
}

@keyframes blobDrift1 {
    0%   { border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; transform: translate(0, 0); }
    50%  { border-radius: 50% 50% 30% 70% / 60% 40% 60% 40%; transform: translate(20px, 10px); }
    100% { border-radius: 70% 30% 50% 50% / 40% 60% 30% 70%; transform: translate(-15px, -5px); }
}

@keyframes blobDrift2 {
    0%   { border-radius: 40% 60% 60% 40% / 50% 50% 50% 50%; transform: translate(0, 0); }
    50%  { border-radius: 60% 40% 30% 70% / 30% 70% 60% 40%; transform: translate(-20px, 15px); }
    100% { border-radius: 30% 70% 50% 50% / 60% 40% 70% 30%; transform: translate(10px, -10px); }
}

@keyframes blobDrift3 {
    0%   { border-radius: 50% 50% 40% 60% / 40% 60% 50% 50%; transform: translate(0, 0); }
    50%  { border-radius: 70% 30% 60% 40% / 50% 50% 30% 70%; transform: translate(15px, -20px); }
    100% { border-radius: 40% 60% 70% 30% / 60% 40% 40% 60%; transform: translate(-10px, 15px); }
}

@keyframes blobDrift4 {
    0%   { border-radius: 60% 40% 50% 50% / 50% 50% 60% 40%; transform: translate(0, 0); }
    50%  { border-radius: 30% 70% 40% 60% / 70% 30% 50% 50%; transform: translate(-15px, -10px); }
    100% { border-radius: 50% 50% 60% 40% / 40% 60% 30% 70%; transform: translate(20px, 5px); }
}

@keyframes blobDrift5 {
    0%   { border-radius: 45% 55% 55% 45% / 55% 45% 45% 55%; transform: translate(0, 0); }
    50%  { border-radius: 65% 35% 45% 55% / 35% 65% 55% 45%; transform: translate(10px, 20px); }
    100% { border-radius: 35% 65% 65% 35% / 55% 45% 35% 65%; transform: translate(-20px, -15px); }
}

.panel-light .blob {
    opacity: 0.05;
}

/* --- Pixel Compass --- */
#pixel-compass {
    position: fixed;
    top: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    z-index: 200;
    cursor: pointer;
}

.compass-sunburst {
    position: absolute;
    top: 0;
    left: 0;
    width: 48px;
    height: 48px;
    background:
        repeating-conic-gradient(
            from 0deg,
            transparent 0deg,
            transparent 6deg,
            rgba(197, 165, 90, 0.2) 7deg,
            transparent 8deg,
            transparent 15deg
        );
    border-radius: 50%;
    border: 2px solid var(--deco-gold);
}

.compass-arrow {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    border-left: 12px solid var(--deco-gold);
    transform: translate(-50%, -50%);
    animation: compassPulse 2s ease-in-out infinite;
}

@keyframes compassPulse {
    0%, 100% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 0.5; transform: translate(-40%, -50%) scale(1.1); }
}

/* --- Progress Bar --- */
#progress-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 8px;
    background: rgba(11, 61, 46, 0.8);
    z-index: 100;
}

#progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(to right, var(--deep-forest), var(--deco-gold));
    transition: width 0.3s ease;
    position: relative;
}

#progress-arrow {
    position: absolute;
    right: -4px;
    top: -2px;
    width: 0;
    height: 0;
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    border-left: 8px solid var(--deco-gold);
}

#progress-label {
    position: fixed;
    bottom: 12px;
    right: 16px;
    font-family: 'Poiret One', cursive;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--deco-gold);
    z-index: 101;
}

/* --- Pixel Scenes --- */
.pixel-scene {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    image-rendering: pixelated;
}

/* Pixel Tree */
.pixel-tree {
    width: 64px;
    height: 96px;
    position: relative;
    image-rendering: pixelated;
}

.pixel-tree::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 12px;
    height: 40px;
    background: #5C3D1E;
    box-shadow:
        4px 0 0 #4A3118,
        -4px 0 0 #6E4E2A;
}

.pixel-tree::after {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 48px;
    height: 64px;
    background: var(--canopy);
    clip-path: polygon(50% 0%, 10% 40%, 20% 40%, 5% 70%, 20% 70%, 0% 100%, 100% 100%, 80% 70%, 95% 70%, 80% 40%, 90% 40%);
    box-shadow: 0 0 0 2px var(--deep-forest);
}

.pixel-tree.glowing::after {
    background: var(--fern);
    box-shadow: 0 0 20px rgba(61, 166, 122, 0.6), 0 0 40px rgba(61, 166, 122, 0.3);
    animation: treeGlow 3s ease-in-out infinite alternate;
}

.pixel-tree.dark::after {
    background: var(--deep-forest);
    box-shadow: none;
}

@keyframes treeGlow {
    0%   { box-shadow: 0 0 20px rgba(61, 166, 122, 0.6), 0 0 40px rgba(61, 166, 122, 0.3); }
    100% { box-shadow: 0 0 30px rgba(61, 166, 122, 0.8), 0 0 60px rgba(61, 166, 122, 0.4); }
}

.tree-label {
    font-family: 'Share Tech Mono', monospace;
    font-size: 14px;
    letter-spacing: 0.04em;
    color: var(--deco-gold);
    margin-top: 8px;
    text-align: center;
}

/* --- Pixel Toggle Switches --- */
.pixel-toggle {
    width: 48px;
    height: 24px;
    background: var(--logic-true);
    border: 2px solid var(--deco-gold);
    cursor: pointer;
    position: relative;
    display: inline-block;
    image-rendering: pixelated;
    transition: background 0.2s;
    padding: 0;
    outline: none;
}

.pixel-toggle[data-state="false"] {
    background: var(--logic-red);
}

.toggle-knob {
    position: absolute;
    top: 2px;
    right: 2px;
    width: 16px;
    height: 16px;
    background: var(--pixel-white);
    transition: right 0.2s, left 0.2s;
    display: block;
    box-shadow: inset -2px -2px 0 rgba(0,0,0,0.1);
}

.pixel-toggle[data-state="false"] .toggle-knob {
    right: auto;
    left: 2px;
}

/* --- Truth Tables --- */
.truth-table {
    background: rgba(11, 61, 46, 0.7);
    border: 2px solid var(--deco-gold);
    border-width: 1px 2px 3px 2px;
    padding: 12px 16px;
    min-width: 200px;
}

.panel-light .truth-table {
    background: rgba(197, 165, 90, 0.1);
    border-color: var(--canopy);
}

.tt-header {
    display: flex;
    gap: 16px;
    justify-content: center;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--deco-gold);
    margin-bottom: 12px;
}

.tt-header span {
    font-family: 'Share Tech Mono', monospace;
    font-size: 14px;
    letter-spacing: 0.04em;
    color: var(--deco-gold);
    min-width: 48px;
    text-align: center;
}

.tt-row {
    display: flex;
    gap: 16px;
    align-items: center;
    justify-content: center;
}

.tt-output {
    font-family: 'Share Tech Mono', monospace;
    font-size: 14px;
    letter-spacing: 0.04em;
    min-width: 48px;
    text-align: center;
    transition: color 0.2s;
}

.tt-output.is-true {
    color: var(--logic-true);
}

.tt-output.is-false {
    color: var(--logic-red);
}

/* --- Mirror Pool (NOT Gate) --- */
.mirror-pool {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    position: relative;
}

.mirror-line {
    width: 120px;
    height: 4px;
    background: linear-gradient(to right, transparent, var(--undergrowth), transparent);
    margin: 4px 0;
}

.pixel-tree.reflected {
    transform: scaleY(-1);
    opacity: 0.6;
}

.pixel-tree.reflected::after {
    background: var(--logic-red);
    box-shadow: 0 0 15px rgba(139, 37, 0, 0.4);
}

.pixel-tree.original.dark-state::after {
    background: var(--deep-forest);
    box-shadow: none;
}

.pixel-tree.reflected.light-state::after {
    background: var(--fern);
    box-shadow: 0 0 20px rgba(61, 166, 122, 0.5);
}

/* --- AND Gate Scene --- */
.and-gate {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    position: relative;
    height: 120px;
    width: 200px;
    justify-content: center;
}

.arch {
    width: 48px;
    height: 80px;
    border: 4px solid var(--undergrowth);
    border-bottom: none;
    border-radius: 24px 24px 0 0;
    position: relative;
    transition: border-color 0.3s;
}

.arch.open {
    border-color: var(--fern);
    box-shadow: 0 0 10px rgba(61, 166, 122, 0.3);
}

.arch.closed {
    border-color: var(--logic-red);
}

.arch.closed::after {
    content: '';
    position: absolute;
    top: 20%;
    left: -2px;
    right: -2px;
    bottom: 0;
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 4px,
        rgba(139, 37, 0, 0.3) 4px,
        rgba(139, 37, 0, 0.3) 8px
    );
}

.merged-path {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 24px;
    background: var(--undergrowth);
    transition: background 0.3s;
}

.merged-path.open {
    background: var(--fern);
    box-shadow: 0 0 10px rgba(61, 166, 122, 0.4);
}

.pixel-deer {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 24px;
    opacity: 0;
    transition: opacity 0.5s, bottom 0.5s;
}

.pixel-deer::before {
    content: '';
    position: absolute;
    width: 16px;
    height: 12px;
    background: var(--deco-gold);
    bottom: 0;
    left: 2px;
}

.pixel-deer::after {
    content: '';
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--deco-gold);
    bottom: 10px;
    left: 6px;
    border-radius: 50%;
}

.pixel-deer.visible {
    opacity: 1;
    bottom: 28px;
}

/* --- OR Gate (River) --- */
.or-gate {
    position: relative;
    width: 200px;
    height: 120px;
}

.river-branch {
    position: absolute;
    top: 0;
    width: 24px;
    height: 60px;
    background: var(--undergrowth);
    opacity: 0.4;
    transition: background 0.3s, opacity 0.3s;
}

.branch-left {
    left: 40px;
    transform: skewX(15deg);
}

.branch-right {
    right: 40px;
    transform: skewX(-15deg);
}

.river-branch.flowing {
    background: var(--fern);
    opacity: 1;
    box-shadow: 0 0 12px rgba(61, 166, 122, 0.5);
}

.river-merged {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 32px;
    height: 60px;
    background: var(--undergrowth);
    opacity: 0.4;
    transition: background 0.3s, opacity 0.3s;
}

.river-merged.flowing {
    background: var(--fern);
    opacity: 1;
    box-shadow: 0 0 12px rgba(61, 166, 122, 0.5);
}

.rain-particles {
    position: absolute;
    top: -20px;
    width: 40px;
    height: 40px;
    opacity: 0;
    transition: opacity 0.3s;
}

.rain-particles.active {
    opacity: 1;
}

.rain-particles.active::before,
.rain-particles.active::after {
    content: '';
    position: absolute;
    width: 2px;
    height: 8px;
    background: var(--fern);
    animation: rainFall 0.6s linear infinite;
}

.rain-particles.active::before {
    left: 10px;
    animation-delay: 0s;
}

.rain-particles.active::after {
    left: 25px;
    animation-delay: 0.3s;
}

#rain-a {
    left: 35px;
}

#rain-b {
    right: 35px;
}

@keyframes rainFall {
    0%   { transform: translateY(-10px); opacity: 1; }
    100% { transform: translateY(40px); opacity: 0; }
}

/* --- XOR Gate (Mushrooms) --- */
.xor-gate {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 40px;
    position: relative;
    height: 100px;
    width: 200px;
}

.mushroom {
    width: 32px;
    height: 48px;
    position: relative;
    transition: filter 0.3s;
}

.mushroom::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 8px;
    height: 24px;
    background: var(--parchment);
}

.mushroom::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 32px;
    height: 24px;
    background: var(--undergrowth);
    border-radius: 16px 16px 4px 4px;
    transition: background 0.3s, box-shadow 0.3s;
}

.mushroom.glow::after {
    background: var(--deco-gold);
    box-shadow: 0 0 16px rgba(197, 165, 90, 0.7), 0 -4px 8px rgba(197, 165, 90, 0.4);
}

.mushroom.dim::after {
    background: var(--deep-forest);
    box-shadow: none;
}

.mushroom-ring {
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 160px;
    height: 16px;
    border: 2px dashed var(--undergrowth);
    border-radius: 50%;
    opacity: 0.4;
}

/* --- Implication Gate --- */
.implication-gate {
    display: flex;
    align-items: center;
    gap: 16px;
    justify-content: center;
}

.pixel-sun {
    width: 48px;
    height: 48px;
    background: var(--deco-gold);
    border-radius: 50%;
    box-shadow: 0 0 20px rgba(197, 165, 90, 0.6);
    transition: background 0.3s, box-shadow 0.3s;
}

.pixel-sun.dim {
    background: var(--undergrowth);
    box-shadow: none;
}

.implication-arrow {
    width: 40px;
    height: 4px;
    background: var(--deco-gold);
    position: relative;
}

.implication-arrow::after {
    content: '';
    position: absolute;
    right: -8px;
    top: -6px;
    border-top: 8px solid transparent;
    border-bottom: 8px solid transparent;
    border-left: 12px solid var(--deco-gold);
}

.pixel-forest {
    width: 48px;
    height: 48px;
    position: relative;
}

.pixel-forest::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background: var(--fern);
    clip-path: polygon(50% 0%, 15% 45%, 25% 45%, 5% 75%, 20% 75%, 0% 100%, 100% 100%, 80% 75%, 95% 75%, 75% 45%, 85% 45%);
    transition: background 0.3s, box-shadow 0.3s;
}

.pixel-forest.awake::before {
    background: var(--fern);
    box-shadow: 0 0 15px rgba(61, 166, 122, 0.5);
}

.pixel-forest.asleep::before {
    background: var(--deep-forest);
    box-shadow: none;
}

/* --- Biconditional Gate --- */
.bic-gate {
    display: flex;
    align-items: center;
    gap: 8px;
    justify-content: center;
}

.bic-bridge {
    width: 40px;
    height: 8px;
    background: var(--undergrowth);
    transition: background 0.3s, box-shadow 0.3s;
}

.bic-bridge.connected {
    background: var(--deco-gold);
    box-shadow: 0 0 10px rgba(197, 165, 90, 0.5);
}

.bic-bridge.broken {
    background: var(--logic-red);
    box-shadow: none;
    background: repeating-linear-gradient(
        90deg,
        var(--logic-red) 0px,
        var(--logic-red) 6px,
        transparent 6px,
        transparent 10px
    );
}

.pixel-tree.bic-left,
.pixel-tree.bic-right {
    width: 48px;
    height: 72px;
}

.pixel-tree.bic-left::after,
.pixel-tree.bic-right::after {
    width: 36px;
    height: 48px;
}

/* --- Tautology Scene --- */
.tautology-scene {
    text-align: center;
}

.tautology-forest {
    display: flex;
    gap: 24px;
    justify-content: center;
    align-items: flex-end;
}

.t-tree {
    animation: treeGlow 2s ease-in-out infinite alternate;
}

.t-tree:nth-child(2) { animation-delay: 0.4s; }
.t-tree:nth-child(3) { animation-delay: 0.8s; }
.t-tree:nth-child(4) { animation-delay: 1.2s; }
.t-tree:nth-child(5) { animation-delay: 1.6s; }

.qed {
    font-family: 'Poiret One', cursive;
    font-size: clamp(1.5rem, 4vw, 3rem);
    letter-spacing: 0.15em;
    color: var(--deco-gold);
    margin-top: 32px;
    text-shadow: 2px 2px 0 rgba(197, 165, 90, 0.3);
    animation: qedPulse 4s ease-in-out infinite alternate;
}

.panel-light .qed {
    color: var(--deep-forest);
    text-shadow: 2px 2px 0 rgba(11, 61, 46, 0.15);
}

@keyframes qedPulse {
    0%   { opacity: 0.7; }
    100% { opacity: 1; }
}

/* --- Lens Flare --- */
.lens-flare {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 300;
    pointer-events: none;
}

.lens-flare.hidden {
    display: none;
}

.lens-flare.active {
    display: block;
    animation: flareFade 600ms ease-out forwards;
}

.flare-core {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    background: var(--pixel-white);
    border-radius: 50%;
}

.flare-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: radial-gradient(circle, transparent 40%, rgba(197, 165, 90, 0.4) 60%, transparent 80%);
}

.flare-halo {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: radial-gradient(circle, transparent 50%, rgba(61, 166, 122, 0.15) 70%, transparent 90%);
}

.flare-streak {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120px;
    height: 2px;
    background: linear-gradient(to right, transparent, var(--deco-gold), transparent);
    opacity: 0.6;
}

@keyframes flareFade {
    0%   { opacity: 0; transform: translate(-50%, -50%) scale(0.3); }
    30%  { opacity: 1; transform: translate(-50%, -50%) scale(1); }
    100% { opacity: 0; transform: translate(-50%, -50%) scale(1.2); }
}

/* --- Chevron Borders --- */
.chevron-border {
    width: 100%;
    height: 8px;
    background:
        linear-gradient(45deg, var(--deco-gold) 25%, transparent 25%),
        linear-gradient(-45deg, var(--deco-gold) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--deco-gold) 75%),
        linear-gradient(-45deg, transparent 75%, var(--deco-gold) 75%);
    background-size: 16px 8px;
    background-position: 0 0, 0 0, 8px 0, 8px 0;
}

/* --- Panel Entry Animation --- */
.panel .panel-content {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.panel.in-view .panel-content {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .panel-content {
        padding: 24px 16px;
        gap: 16px;
    }

    .pixel-tree {
        width: 48px;
        height: 72px;
    }

    .pixel-tree::before {
        width: 8px;
        height: 28px;
    }

    .pixel-tree::after {
        width: 36px;
        height: 48px;
    }

    .truth-table {
        min-width: 160px;
        padding: 8px 12px;
    }

    .and-gate, .or-gate, .xor-gate {
        width: 160px;
        height: 100px;
    }

    .tautology-forest {
        gap: 12px;
    }

    .t-tree {
        width: 40px;
        height: 60px;
    }
}