:root {
    --bg: #FFFFFF;
    --fg: #000000;
    --accent: #FFFF00; /* Cyber Yellow */
    --border-width: 4px;
    --shadow: 8px 8px 0px 0px #000000;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Courier New', Courier, monospace;
}

body {
    background-color: var(--bg);
    color: var(--fg);
    overflow-x: hidden;
    line-height: 1.6;
}

/* Brutal Components */
.brutal-border {
    border: var(--border-width) solid var(--fg);
    background: var(--bg);
}

.hidden {
    display: none !important;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    margin-bottom: 1rem;
    border-top: none;
    border-left: none;
    border-right: none;
    flex-wrap: wrap;
    gap: 1rem;
    position: sticky;
    top: 0;
    background: var(--bg);
    z-index: 1000;
}

.logo {
    font-size: 1.5rem;
    font-weight: 900;
    background: var(--accent);
    padding: 0.5rem 1rem;
}

nav {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

nav a {
    text-decoration: none;
    color: var(--fg);
    font-weight: bold;
    margin-left: 0;
    padding: 0.5rem 1rem;
    border: 2px solid transparent;
    font-size: 0.8rem;
}

nav a:hover, nav a.active {
    background: var(--accent);
    border: 2px solid var(--fg);
}

/* Views */
.view {
    display: none;
    padding: 0 2rem 4rem 2rem;
    min-height: 80vh;
}

.view.active {
    display: block;
}

/* Hero */
.hero {
    text-align: center;
    margin-top: 2rem;
}

h1 {
    font-size: 4rem;
    font-weight: 900;
    text-transform: uppercase;
    margin-bottom: 1rem;
    letter-spacing: -2px;
}

.subtitle {
    font-size: 1.5rem;
    font-weight: bold;
    background: var(--fg);
    color: var(--bg);
    display: inline-block;
    padding: 0.5rem 1rem;
    margin-bottom: 2rem;
}

.teaser-container {
    max-width: 800px;
    height: 300px;
    margin: 0 auto 2rem auto;
    position: relative;
    box-shadow: var(--shadow);
}

.teaser-container canvas {
    width: 100%;
    height: 100%;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 3rem;
}

.cta {
    font-size: 1.5rem;
    font-weight: 900;
    padding: 1.5rem 3rem;
    background: var(--accent);
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: transform 0.1s;
}

.cta:active {
    transform: translate(4px, 4px);
    box-shadow: 4px 4px 0px 0px #000000;
}

.cta-secondary {
    font-size: 1.5rem;
    font-weight: 900;
    padding: 1.5rem 3rem;
    background: var(--bg);
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: transform 0.1s;
}

.cta-secondary:hover {
    background: var(--accent);
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 0;
}

.feature-card {
    padding: 2rem;
    box-shadow: 6px 6px 0px 0px #000000;
    text-align: center;
}

.feature-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-weight: bold;
}

/* Explorer Grid */
.explorer-grid {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 2rem;
}

.controls {
    padding: 1.5rem;
    box-shadow: var(--shadow);
    height: fit-content;
}

.dist-selector {
    margin-bottom: 2rem;
}

.dist-selector label {
    display: block;
    font-weight: 900;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.dist-selector select {
    width: 100%;
    padding: 0.8rem;
    border: 3px solid var(--fg);
    font-weight: bold;
    font-size: 1.1rem;
    background: var(--bg);
    cursor: pointer;
}

.sliders-list {
    margin-bottom: 2rem;
}

.param-control {
    margin-bottom: 1.5rem;
}

.param-control label {
    display: flex;
    justify-content: space-between;
    font-weight: 900;
    margin-bottom: 0.5rem;
}

.param-control input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 20px;
    border: 3px solid var(--fg);
    background: var(--bg);
    outline: none;
}

.param-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 30px;
    height: 30px;
    background: var(--accent);
    border: 3px solid var(--fg);
    cursor: pointer;
}

.cta-small {
    width: 100%;
    padding: 1rem;
    font-weight: 900;
    background: var(--bg);
    cursor: pointer;
    margin-bottom: 1rem;
}

.cta-small:hover {
    background: var(--accent);
}

.formula-box {
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    padding: 1rem;
    font-family: monospace;
    font-size: 1.1rem;
    background: #eee;
    text-align: center;
}

.math-toggle {
    margin-bottom: 0;
}

/* Graph Area */
.canvas-wrapper {
    height: 500px;
    margin-bottom: 2rem;
    position: relative;
    box-shadow: var(--shadow);
    background: white;
}

#mainCanvas, #compareCanvas {
    width: 100%;
    height: 100%;
}

.readout {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 2rem;
    font-weight: 900;
    background: var(--accent);
    padding: 0.5rem 1rem;
    border: 3px solid var(--fg);
    pointer-events: none;
    line-height: 1.2;
}

/* Cards */
.intuition-cards {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1.5rem;
}

.card {
    padding: 1.5rem;
    box-shadow: 6px 6px 0px 0px #000000;
}

.card h3 {
    background: var(--fg);
    color: var(--bg);
    padding: 0.3rem 0.6rem;
    display: inline-block;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.card p {
    font-weight: bold;
    font-size: 1.1rem;
}

/* Calculator Section */
.calculator-container, .compare-container, .learn-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem 0;
}

.calculator-container h2, .compare-container h2, .learn-container h2 {
    font-size: 3rem;
    text-align: center;
    margin-bottom: 2rem;
    background: var(--accent);
    display: inline-block;
    padding: 0 1rem;
}

.calc-grid, .compare-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.calc-panel, .compare-panel {
    padding: 2rem;
    box-shadow: var(--shadow);
}

.calc-panel h3, .compare-panel h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    background: var(--fg);
    color: var(--bg);
    padding: 0.5rem 1rem;
    display: inline-block;
}

.calc-panel select, .compare-panel select {
    width: 100%;
    padding: 0.8rem;
    border: 3px solid var(--fg);
    font-weight: bold;
    margin-bottom: 1rem;
    background: var(--bg);
}

.calc-panel label {
    display: block;
    font-weight: bold;
    margin: 1rem 0;
}

.calc-panel input[type="radio"] {
    margin-right: 0.5rem;
}

.calc-inputs {
    margin: 2rem 0;
}

.calc-inputs input {
    width: 100%;
    padding: 0.8rem;
    border: 3px solid var(--fg);
    font-weight: bold;
    margin-top: 0.5rem;
    background: var(--bg);
    font-size: 1.1rem;
}

.calc-result {
    font-size: 1.5rem;
    font-weight: bold;
    padding: 2rem;
    background: var(--accent);
    border: 3px solid var(--fg);
    min-height: 150px;
}

.calc-params {
    margin-top: 1rem;
}

.calc-params label {
    display: block;
    margin: 1rem 0 0.5rem 0;
}

.calc-params input {
    width: 100%;
    padding: 0.8rem;
    border: 3px solid var(--fg);
    font-weight: bold;
    background: var(--bg);
    font-size: 1.1rem;
}

/* Compare Section */
.compare-canvas-wrapper {
    height: 500px;
    margin: 2rem 0;
    position: relative;
    box-shadow: var(--shadow);
    background: white;
}

.compare-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.stat-col h4 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    background: var(--fg);
    color: var(--bg);
    padding: 0.5rem 1rem;
    display: inline-block;
}

.stat-col p {
    font-weight: bold;
    font-size: 1.2rem;
    line-height: 1.8;
}

/* Learn Section */
.lesson-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.lesson-card {
    padding: 2rem;
    box-shadow: var(--shadow);
}

.lesson-card h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.lesson-card h4 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    background: var(--accent);
    padding: 0.3rem 0.8rem;
    display: inline-block;
}

.lesson-card p {
    font-weight: bold;
    margin-bottom: 1rem;
}

.lesson-card ul {
    list-style: none;
    padding-left: 0;
}

.lesson-card li {
    font-weight: bold;
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.lesson-card li:before {
    content: "▸";
    position: absolute;
    left: 0;
}

.quiz-section {
    padding: 2rem;
    box-shadow: var(--shadow);
}

.quiz-section h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.quiz-btn {
    padding: 1rem 2rem;
    margin: 0.5rem;
    font-weight: bold;
    background: var(--bg);
    cursor: pointer;
}

.quiz-btn:hover {
    background: var(--accent);
}

.quiz-btn.correct {
    background: #00FF00;
}

.quiz-btn.incorrect {
    background: #FF0000;
    color: white;
}

/* About */
.about-content {
    max-width: 900px;
    margin: 2rem auto;
    padding: 3rem;
    box-shadow: var(--shadow);
}

.about-content h2 {
    font-size: 3rem;
    margin-bottom: 2rem;
    background: var(--accent);
    display: inline-block;
    padding: 0 1rem;
}

.about-content h3 {
    font-size: 2rem;
    margin: 2rem 0 1rem 0;
    background: var(--fg);
    color: var(--bg);
    padding: 0.5rem 1rem;
    display: inline-block;
}

.about-content p {
    font-size: 1.2rem;
    font-weight: bold;
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.about-content ul {
    list-style: none;
    padding-left: 0;
    margin-bottom: 2rem;
}

.about-content li {
    font-size: 1.2rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
    padding-left: 2rem;
    position: relative;
}

.about-content li:before {
    content: "▸";
    position: absolute;
    left: 0;
    font-size: 1.5rem;
}

.about-content a {
    display: inline-block;
    margin-top: 1rem;
    text-decoration: none;
    color: var(--fg);
}

/* Footer */
footer {
    padding: 2rem;
    border-bottom: none;
    border-left: none;
    border-right: none;
    background: var(--fg);
    color: var(--bg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto 2rem auto;
}

.footer-section h4 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    background: var(--accent);
    color: var(--fg);
    padding: 0.3rem 0.8rem;
    display: inline-block;
}

.footer-section p {
    font-weight: bold;
}

.footer-section a {
    display: block;
    color: var(--bg);
    text-decoration: none;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.footer-section a:hover {
    background: var(--accent);
    color: var(--fg);
    padding-left: 0.5rem;
}

.footer-bottom {
    text-align: center;
    font-weight: 900;
    padding-top: 2rem;
    border-top: 3px solid var(--bg);
}

/* Animations */
@keyframes shake {
    0% { transform: translate(1px, 1px) rotate(0deg); }
    10% { transform: translate(-1px, -2px) rotate(-1deg); }
    20% { transform: translate(-3px, 0px) rotate(1deg); }
    30% { transform: translate(3px, 2px) rotate(0deg); }
    40% { transform: translate(1px, -1px) rotate(1deg); }
    50% { transform: translate(-1px, 2px) rotate(-1deg); }
    60% { transform: translate(-3px, 1px) rotate(0deg); }
    70% { transform: translate(3px, 1px) rotate(-1deg); }
    80% { transform: translate(-1px, -1px) rotate(1deg); }
    90% { transform: translate(1px, 2px) rotate(0deg); }
    100% { transform: translate(1px, -2px) rotate(-1deg); }
}

.shake {
    animation: shake 0.3s linear;
}

/* Mobile */
@media (max-width: 1200px) {
    .lesson-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 900px) {
    .explorer-grid {
        grid-template-columns: 1fr;
    }
    h1 {
        font-size: 2.5rem;
    }
    .intuition-cards {
        grid-template-columns: 1fr;
    }
    header {
        justify-content: center;
        text-align: center;
    }
    .canvas-wrapper, .compare-canvas-wrapper {
        height: 350px;
    }
    .readout {
        font-size: 1.2rem;
        top: 10px;
        right: 10px;
        padding: 0.3rem 0.6rem;
    }
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    .cta, .cta-secondary {
        font-size: 1.2rem;
        padding: 1rem 2rem;
    }
    .compare-stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    h1 {
        font-size: 2rem;
    }
    .view {
        padding: 0 1rem 2rem 1rem;
    }
    nav {
        justify-content: center;
        width: 100%;
    }
    nav a {
        font-size: 0.7rem;
        padding: 0.4rem 0.6rem;
    }
    .logo {
        font-size: 1.2rem;
    }
    .calc-grid, .compare-grid {
        grid-template-columns: 1fr;
    }
}