:root {
    --bg-color: #111111;
    --text-color: #e6e6e6;
    --dim-color: #888888;
    --accent-color: #50fa7b; /* Terminal Green */
    --border-color: #333333;
    --code-bg: #1a1a1a;
    --font-stack: 'Fira Code', 'Consolas', 'Monaco', 'Courier New', monospace;
}

/* Base Setup */
* {
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-stack);
    line-height: 1.6;
    max-width: 900px;
    margin: 0 auto;
    padding: 60px 20px;
    font-size: 16px;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    margin-top: 2em;
    margin-bottom: 1em;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #fff;
}

h1 {
    font-size: 1.8rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 15px;
    margin-top: 0;
    display: inline-block;
    padding-right: 10px;
}

/* The "Blinking Cursor" effect */
h1::after {
    content: '█';
    margin-left: 5px;
    color: var(--accent-color);
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

h2 {
    font-size: 1.4rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

h2::before {
    content: "./";
    color: var(--dim-color);
    margin-right: 10px;
}

h3 {
    font-size: 1.1rem;
    color: var(--accent-color);
}

p {
    margin-bottom: 1.5em;
    text-align: justify;
}

/* Links & Buttons */
a {
    color: var(--text-color);
    text-decoration: none;
    border-bottom: 1px dotted var(--dim-color);
    transition: all 0.2s;
}

a:hover {
    color: var(--accent-color);
    border-bottom-style: solid;
}

.links {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 30px;
}

.links .btn-link {
    display: inline-flex;
    align-items: center;
    padding: 10px 18px;
    background: transparent;
    border: 1px solid var(--dim-color);
    color: var(--dim-color);
    font-size: 0.9rem;
    border-radius: 0; /* Minimalist square corners */
    text-transform: uppercase;
    border-bottom: 1px solid var(--dim-color); /* Reset override */
    cursor: pointer;
}

.links .btn-link:hover {
    border-color: var(--accent-color);
    color: var(--bg-color);
    background-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 4px 4px 0 var(--border-color); /* Retro shadow */
}

.links svg {
    fill: currentColor;
    margin-right: 8px;
    width: 18px;
    height: 18px;
}

/* Layout Sections */
section {
    background: transparent;
    border: none;
    padding: 0;
    margin-bottom: 80px;
}

.authors {
    color: var(--dim-color);
    font-size: 0.9rem;
    margin-bottom: 40px;
    border-left: 2px solid var(--border-color);
    padding-left: 15px;
}

/* Figures */
.figure-container {
    margin: 40px 0;
    border: 1px solid var(--border-color);
    padding: 10px;
    background: #000;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    /* filter: grayscale(100%) contrast(1.1);  Removed grayscale as per user request */
    transition: filter 0.3s;
}

img:hover {
    /* filter: grayscale(0%) contrast(1); */
}

.caption {
    margin-top: 15px;
    padding-top: 10px;
    font-size: 0.8rem;
    color: var(--dim-color);
    font-family: var(--font-stack);
    border-top: 1px dashed var(--border-color);
    text-align: left;
}

.caption strong {
    color: var(--text-color);
}

/* Interactive Figure Specifics */
.interactive-figure {
    background: #0a0a0a;
}

.figure-header {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
    border-bottom: 1px dashed var(--border-color);
    padding-bottom: 10px;
}

.sample-nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-btn {
    background: transparent;
    border: 1px solid var(--dim-color);
    color: var(--accent-color);
    font-family: var(--font-stack);
    padding: 5px 15px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.nav-btn:hover {
    background: var(--accent-color);
    color: var(--bg-color);
}

#sampleIndicator, #ropeSampleIndicator, #pcaSampleIndicator {
    font-weight: bold;
    color: var(--text-color);
    min-width: 100px;
    text-align: center;
}

.rope-grid {
    display: grid;
    grid-template-columns: auto 1fr 1fr 1fr 1fr; /* Added column for original image */
    gap: 10px;
    align-items: center;
}

.pca-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    align-items: center;
    margin-bottom: 20px;
}

.grid-header {
    text-align: center;
    color: var(--dim-color);
    font-size: 0.85rem;
    padding-bottom: 5px;
    border-bottom: 1px solid var(--border-color);
}

.grid-label {
    text-align: right;
    padding-right: 10px;
    font-size: 0.85rem;
    font-weight: bold;
    color: var(--text-color);
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    display: flex;
    justify-content: center;
    height: 100%;
    border-left: 2px solid var(--border-color);
}

.grid-label .sub-label {
    font-weight: normal;
    color: var(--dim-color);
    font-size: 0.75rem;
    margin-top: 5px;
}

/* Row spanning for the original image */
.rowspan-2 {
    grid-row: span 2;
}

/* Responsive grid for small screens */
@media (max-width: 600px) {
    .rope-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .pca-grid {
        grid-template-columns: 1fr;
    }
    .grid-header, .grid-label {
        writing-mode: horizontal-tb;
        transform: none;
        border: none;
        text-align: center;
        padding: 10px 0;
    }
    .grid-img {
        margin-bottom: 15px;
    }
    .rowspan-2 {
        grid-row: auto;
    }
}


/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
    font-size: 0.9rem;
    border: 1px solid var(--border-color);
}

th, td {
    padding: 12px;
    text-align: left;
    border: 1px solid var(--border-color);
}

th {
    text-transform: uppercase;
    color: var(--accent-color);
    font-weight: normal;
    background: var(--code-bg);
}

tr:hover td {
    background-color: var(--code-bg);
}

.highlight {
    color: var(--accent-color);
    font-weight: bold;
}

/* Grid System */
.flex-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-top: 30px;
}

.flex-col h4 {
    margin-top: 0;
    font-size: 1rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
    display: inline-block;
}

/* Code & Misc */
code {
    background-color: var(--code-bg);
    color: var(--accent-color);
    padding: 2px 6px;
    font-size: 0.9em;
}

ul {
    list-style-type: square; /* Square bullets */
    padding-left: 20px;
    color: var(--dim-color);
}

ul li {
    margin-bottom: 10px;
}

ul li strong {
    color: var(--text-color);
}

.abstract-text {
    font-size: 1.1rem;
    border-left: 4px solid var(--accent-color);
    padding-left: 20px;
    margin-left: 0;
}

footer {
    text-align: center;
    margin-top: 80px;
    color: var(--dim-color);
    font-size: 0.8rem;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}