/* The Queueing Laboratory - Steampunk Victorian Design */

@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@400;600;700;900&family=Cormorant+Garamond:ital,wght@0,400;0,600;0,700;1,400&family=Crimson+Text:ital,wght@0,400;0,600;0,700;1,400&display=swap');

:root {
    /* Steampunk Sepia Palette */
    --brass-dark: #6b5225;
    --brass: #b8860b;
    --brass-light: #daa520;
    --copper: #b87333;
    --copper-light: #cd7f32;
    --bronze: #8b6914;
    --bronze-dark: #704214;
    
    /* Aged Paper & Backgrounds */
    --parchment: #f4e8d0;
    --parchment-dark: #e8d4b0;
    --aged-cream: #f0e6d2;
    --sepia-dark: #3e2723;
    --sepia-medium: #5d4037;
    --sepia-light: #795548;
    
    /* Oxidized Accents */
    --verdigris: #43a047;
    --patina: #2e7d32;
    --rust: #8d4004;
    
    /* Functional */
    --shadow-brass: 0 4px 12px rgba(184, 134, 11, 0.3);
    --shadow-deep: 0 8px 24px rgba(62, 39, 35, 0.4);
    --shadow-inset: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body { 
    font-family: 'Cormorant Garamond', Georgia, serif;
    background: 
        linear-gradient(rgba(244, 232, 208, 0.9), rgba(232, 212, 176, 0.9)),
        repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(139, 105, 20, 0.03) 2px, rgba(139, 105, 20, 0.03) 4px);
    background-color: var(--parchment);
    color: var(--sepia-dark);
    line-height: 1.7;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    position: relative;
}

/* Decorative Gears */
body::before {
    content: '';
    position: fixed;
    top: -100px;
    right: -100px;
    width: 300px;
    height: 300px;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="30" fill="none" stroke="%23b8860b" stroke-width="3"/><circle cx="50" cy="50" r="20" fill="none" stroke="%23b8860b" stroke-width="2"/><path d="M50,5 L50,20 M50,80 L50,95 M5,50 L20,50 M80,50 L95,50 M15,15 L25,25 M75,75 L85,85 M85,15 L75,25 M25,75 L15,85" stroke="%23b8860b" stroke-width="4"/></svg>') center/contain no-repeat;
    opacity: 0.15;
    animation: rotateGear 30s linear infinite;
    pointer-events: none;
    z-index: 0;
}

body::after {
    content: '';
    position: fixed;
    bottom: -80px;
    left: -80px;
    width: 250px;
    height: 250px;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="35" fill="none" stroke="%23704214" stroke-width="4"/><circle cx="50" cy="50" r="25" fill="none" stroke="%23704214" stroke-width="3"/><path d="M50,0 L50,15 M50,85 L50,100 M0,50 L15,50 M85,50 L100,50 M10,10 L22,22 M78,78 L90,90 M90,10 L78,22 M22,78 L10,90" stroke="%23704214" stroke-width="5"/></svg>') center/contain no-repeat;
    opacity: 0.12;
    animation: rotateGear 40s linear infinite reverse;
    pointer-events: none;
    z-index: 0;
}

@keyframes rotateGear {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Ornate Border Corners */
.page-corner {
    position: fixed;
    width: 80px;
    height: 80px;
    pointer-events: none;
    z-index: 10;
    opacity: 0.3;
}

.page-corner.top-left {
    top: 0;
    left: 0;
    border-top: 4px solid var(--brass);
    border-left: 4px solid var(--brass);
    border-top-left-radius: 10px;
}

.page-corner.top-right {
    top: 0;
    right: 0;
    border-top: 4px solid var(--brass);
    border-right: 4px solid var(--brass);
    border-top-right-radius: 10px;
}

.page-corner.bottom-left {
    bottom: 0;
    left: 0;
    border-bottom: 4px solid var(--brass);
    border-left: 4px solid var(--brass);
    border-bottom-left-radius: 10px;
}

.page-corner.bottom-right {
    bottom: 0;
    right: 0;
    border-bottom: 4px solid var(--brass);
    border-right: 4px solid var(--brass);
    border-bottom-right-radius: 10px;
}

/* Navigation */
nav {
    background: 
        linear-gradient(135deg, var(--sepia-dark) 0%, var(--sepia-medium) 100%);
    padding: 1.5rem 0;
    box-shadow: var(--shadow-deep);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 3px solid var(--brass);
    position: relative;
}

nav::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    right: 0;
    height: 3px;
    background: repeating-linear-gradient(90deg, 
        var(--brass) 0px, 
        var(--brass) 10px, 
        var(--copper) 10px, 
        var(--copper) 20px
    );
}

nav .container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    position: relative;
    z-index: 1;
}

nav .logo {
    font-family: 'Cinzel', Georgia, serif;
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--brass-light);
    text-decoration: none;
    text-shadow: 
        0 0 10px rgba(218, 165, 32, 0.5),
        2px 2px 4px rgba(0, 0, 0, 0.5);
    letter-spacing: 2px;
    position: relative;
}

nav .logo::before {
    content: '⚙';
    margin-right: 12px;
    animation: rotateGear 8s linear infinite;
    display: inline-block;
    color: var(--copper-light);
}

nav .nav-links {
    display: flex;
    gap: 25px;
    flex-wrap: wrap;
}

nav a {
    color: var(--parchment);
    text-decoration: none;
    font-weight: 600;
    font-family: 'Crimson Text', serif;
    transition: all 0.3s ease;
    padding: 8px 16px;
    border-radius: 4px;
    border: 1px solid transparent;
    position: relative;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--brass-light);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

nav a:hover::after {
    width: 80%;
}

nav a:hover {
    color: var(--brass-light);
    border-color: var(--brass);
}

nav a.active {
    color: var(--brass-light);
    background: rgba(184, 134, 11, 0.2);
    border-color: var(--brass);
    box-shadow: var(--shadow-brass);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 30px;
    position: relative;
    z-index: 1;
}

/* Hero Header with Mechanical Elements */
.hero-header {
    background: 
        linear-gradient(135deg, 
            rgba(62, 39, 35, 0.95) 0%, 
            rgba(93, 64, 55, 0.9) 50%,
            rgba(112, 66, 20, 0.85) 100%
        ),
        url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 200"><defs><pattern id="gears" x="0" y="0" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="15" fill="none" stroke="rgba(184,134,11,0.1)" stroke-width="2"/><circle cx="75" cy="75" r="18" fill="none" stroke="rgba(184,134,11,0.1)" stroke-width="2"/></pattern></defs><rect width="200" height="200" fill="url(%23gears)"/></svg>');
    color: var(--parchment);
    padding: 5rem 3rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    margin-bottom: 60px;
    border-bottom: 5px solid var(--brass);
    box-shadow: var(--shadow-deep);
}

.hero-header::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 120px;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="none" stroke="%23daa520" stroke-width="3"/><circle cx="50" cy="50" r="30" fill="none" stroke="%23b8860b" stroke-width="4"/><circle cx="50" cy="50" r="15" fill="%23704214"/><path d="M50,10 L50,25 M50,75 L50,90 M10,50 L25,50 M75,50 L90,50 M18,18 L28,28 M72,72 L82,82 M82,18 L72,28 M28,72 L18,82" stroke="%23daa520" stroke-width="5" stroke-linecap="round"/></svg>') center/contain no-repeat;
    animation: rotateGear 20s linear infinite;
    opacity: 0.4;
}

.hero-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 40px;
    background: repeating-linear-gradient(90deg,
        transparent 0px,
        transparent 8px,
        rgba(184, 134, 11, 0.3) 8px,
        rgba(184, 134, 11, 0.3) 10px
    );
}

.hero-header h1 {
    font-family: 'Cinzel', Georgia, serif;
    font-size: 4rem;
    font-weight: 900;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
    color: var(--brass-light);
    text-shadow: 
        0 0 20px rgba(218, 165, 32, 0.6),
        3px 3px 6px rgba(0, 0, 0, 0.8);
    letter-spacing: 3px;
}

.hero-header .subtitle {
    font-family: 'Crimson Text', serif;
    font-size: 1.5rem;
    font-style: italic;
    color: var(--parchment-dark);
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-header .tagline {
    font-family: 'Cormorant Garamond', serif;
    font-size: 1.1rem;
    color: var(--aged-cream);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Page Headers */
.page-header {
    text-align: center;
    padding: 60px 20px;
    margin-bottom: 50px;
    background: 
        linear-gradient(rgba(244, 232, 208, 0.9), rgba(232, 212, 176, 0.95)),
        repeating-linear-gradient(45deg, transparent, transparent 10px, rgba(139, 105, 20, 0.05) 10px, rgba(139, 105, 20, 0.05) 20px);
    border: 2px solid var(--brass);
    border-radius: 8px;
    box-shadow: var(--shadow-brass);
    position: relative;
}

.page-header::before,
.page-header::after {
    content: '⚙';
    position: absolute;
    font-size: 3rem;
    color: var(--brass);
    opacity: 0.2;
    animation: rotateGear 15s linear infinite;
}

.page-header::before {
    top: 20px;
    left: 30px;
}

.page-header::after {
    bottom: 20px;
    right: 30px;
    animation-direction: reverse;
}

.page-header h1 {
    font-family: 'Cinzel', Georgia, serif;
    font-size: 3.5rem;
    color: var(--sepia-dark);
    margin-bottom: 15px;
    font-weight: 900;
    text-shadow: 2px 2px 4px rgba(139, 105, 20, 0.2);
    position: relative;
    z-index: 1;
}

.page-header .subtitle {
    font-size: 1.4rem;
    color: var(--brass-dark);
    font-weight: 600;
    font-style: italic;
    font-family: 'Crimson Text', serif;
}

/* Variable Sidebar - Brass Instrument Panel */
.variable-sidebar {
    position: sticky;
    top: 100px;
    float: right;
    width: 280px;
    background: 
        linear-gradient(135deg, var(--parchment) 0%, var(--parchment-dark) 100%);
    padding: 25px;
    border-radius: 8px;
    box-shadow: 
        var(--shadow-deep),
        inset 0 0 0 3px var(--brass),
        inset 0 0 0 6px var(--parchment);
    border: 2px solid var(--bronze-dark);
    margin: 0 0 30px 30px;
    position: relative;
}

.variable-sidebar::before {
    content: '';
    position: absolute;
    top: 10px;
    right: 10px;
    width: 40px;
    height: 40px;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 50 50"><circle cx="25" cy="25" r="20" fill="none" stroke="%23b8860b" stroke-width="2"/><circle cx="25" cy="25" r="12" fill="%23704214"/><path d="M25,5 L25,15 M25,35 L25,45 M5,25 L15,25 M35,25 L45,25" stroke="%23b8860b" stroke-width="3"/></svg>') center/contain no-repeat;
    opacity: 0.3;
    animation: rotateGear 12s linear infinite;
}

/* Rivet decorations */
.variable-sidebar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 15px 15px, var(--brass-dark) 3px, transparent 3px),
        radial-gradient(circle at calc(100% - 15px) 15px, var(--brass-dark) 3px, transparent 3px),
        radial-gradient(circle at 15px calc(100% - 15px), var(--brass-dark) 3px, transparent 3px),
        radial-gradient(circle at calc(100% - 15px) calc(100% - 15px), var(--brass-dark) 3px, transparent 3px);
    pointer-events: none;
}

.variable-sidebar h3 {
    font-family: 'Cinzel', Georgia, serif;
    color: var(--sepia-dark);
    font-size: 1.4rem;
    margin: 0 0 20px 0;
    padding-bottom: 10px;
    border-bottom: 3px double var(--brass);
    position: relative;
    z-index: 1;
}

.variable-sidebar h3::before {
    content: '𝝅';
    margin-right: 8px;
    color: var(--brass);
}

.var-item {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--brass);
    position: relative;
    z-index: 1;
}

.var-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.var-item strong {
    display: block;
    color: var(--sepia-dark);
    font-size: 1.1rem;
    font-family: 'Crimson Text', serif;
    margin-bottom: 5px;
    font-weight: 700;
}

.var-item p {
    font-size: 0.9rem;
    color: var(--sepia-medium);
    margin: 5px 0;
    line-height: 1.5;
}

.var-note {
    font-size: 0.85rem !important;
    color: var(--rust) !important;
    font-weight: 600;
    font-style: italic;
}

/* Section Styling - Ornate Panels */
section {
    background: 
        linear-gradient(var(--parchment) 0%, var(--aged-cream) 100%);
    padding: 50px;
    border-radius: 8px;
    box-shadow: 
        var(--shadow-deep),
        inset 0 0 0 2px var(--brass-dark),
        inset 0 0 0 5px var(--parchment);
    margin-bottom: 50px;
    border: 3px solid var(--bronze-dark);
    position: relative;
}

/* Corner rivets for sections */
section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20px 20px, var(--brass-dark) 4px, transparent 4px),
        radial-gradient(circle at calc(100% - 20px) 20px, var(--brass-dark) 4px, transparent 4px),
        radial-gradient(circle at 20px calc(100% - 20px), var(--brass-dark) 4px, transparent 4px),
        radial-gradient(circle at calc(100% - 20px) calc(100% - 20px), var(--brass-dark) 4px, transparent 4px);
    pointer-events: none;
}

section h2 {
    font-family: 'Cinzel', Georgia, serif;
    color: var(--sepia-dark);
    font-size: 2.5rem;
    font-weight: 900;
    border-bottom: 4px double var(--brass);
    padding-bottom: 15px;
    margin: 0 0 30px 0;
    text-shadow: 2px 2px 4px rgba(139, 105, 20, 0.15);
    position: relative;
}

section h2::before {
    content: '⚙';
    margin-right: 15px;
    color: var(--brass);
    display: inline-block;
    animation: rotateGear 10s linear infinite;
}

section h3 {
    color: var(--brass-dark);
    font-size: 1.8rem;
    margin: 35px 0 20px 0;
    font-weight: 700;
    font-family: 'Crimson Text', serif;
    display: flex;
    align-items: center;
    gap: 12px;
}

section h3::before {
    content: '❖';
    color: var(--copper);
    font-size: 0.8em;
}

section p {
    font-size: 1.15rem;
    margin-bottom: 20px;
    color: var(--sepia-medium);
    line-height: 1.8;
}

section strong {
    color: var(--sepia-dark);
    font-weight: 700;
}

section em {
    color: var(--brass-dark);
    font-style: italic;
    font-weight: 600;
}

section ul {
    margin: 20px 0 20px 40px;
    color: var(--sepia-medium);
}

section li {
    margin: 10px 0;
}

section li::marker {
    color: var(--brass);
}

/* Math Boxes - Scientific Instrument Style */
.math-box {
    background: 
        linear-gradient(135deg, var(--aged-cream) 0%, var(--parchment-dark) 100%);
    padding: 35px;
    border-radius: 6px;
    margin: 30px 0;
    border: 3px solid var(--brass-dark);
    box-shadow: 
        var(--shadow-brass),
        inset 0 2px 4px rgba(0, 0, 0, 0.1);
    overflow-x: auto;
    font-size: 1.2rem;
    position: relative;
}

.math-box::before {
    content: '';
    position: absolute;
    top: 10px;
    right: 15px;
    width: 60px;
    height: 60px;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 50 50"><circle cx="25" cy="25" r="20" fill="none" stroke="%23b8860b" stroke-width="2"/><path d="M15,15 L35,35 M35,15 L15,35" stroke="%23b8860b" stroke-width="2"/><circle cx="25" cy="25" r="8" fill="%23704214"/></svg>') center/contain no-repeat;
    opacity: 0.1;
}

/* Example Cards - Aged Documents */
.example-card {
    background: 
        linear-gradient(135deg, var(--parchment) 0%, var(--aged-cream) 100%);
    padding: 40px;
    border-radius: 6px;
    border-left: 6px solid var(--brass);
    border-right: 2px solid var(--bronze-dark);
    border-top: 2px solid var(--bronze-dark);
    border-bottom: 2px solid var(--bronze-dark);
    margin: 30px 0;
    box-shadow: var(--shadow-deep);
    position: relative;
}

.example-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20px 20px, var(--brass-dark) 3px, transparent 3px),
        radial-gradient(circle at calc(100% - 20px) calc(100% - 20px), var(--brass-dark) 3px, transparent 3px);
    pointer-events: none;
}

.example-card h3 {
    color: var(--sepia-dark);
    font-size: 1.8rem;
    margin: 0 0 20px 0;
    border: none;
    font-family: 'Cinzel', serif;
}

.example-card h3::before {
    content: '📜';
    margin-right: 10px;
}

.hint-box {
    background: 
        linear-gradient(135deg, #f4e4c1 0%, #e8d4a8 100%);
    padding: 25px;
    border-radius: 6px;
    border-left: 5px solid var(--rust);
    border-top: 2px solid var(--bronze);
    border-right: 2px solid var(--bronze);
    border-bottom: 2px solid var(--bronze);
    margin: 25px 0;
    font-weight: 600;
    box-shadow: var(--shadow-brass);
}

.warning {
    color: var(--rust);
    font-weight: 700;
}

/* Lab UI - Control Panel with Brass Fixtures */
.lab-ui {
    background: 
        linear-gradient(135deg, var(--sepia-dark) 0%, var(--sepia-medium) 100%);
    padding: 45px;
    border-radius: 12px;
    border: 4px solid var(--brass);
    box-shadow: 
        var(--shadow-deep),
        inset 0 0 0 2px var(--sepia-dark),
        inset 0 0 0 6px var(--brass-dark);
    position: relative;
}

/* Control panel rivets */
.lab-ui::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 25px 25px, var(--copper-light) 5px, transparent 5px),
        radial-gradient(circle at calc(100% - 25px) 25px, var(--copper-light) 5px, transparent 5px),
        radial-gradient(circle at 25px calc(100% - 25px), var(--copper-light) 5px, transparent 5px),
        radial-gradient(circle at calc(100% - 25px) calc(100% - 25px), var(--copper-light) 5px, transparent 5px),
        radial-gradient(circle at 50% 25px, var(--copper-light) 5px, transparent 5px),
        radial-gradient(circle at 50% calc(100% - 25px), var(--copper-light) 5px, transparent 5px),
        radial-gradient(circle at 25px 50%, var(--copper-light) 5px, transparent 5px),
        radial-gradient(circle at calc(100% - 25px) 50%, var(--copper-light) 5px, transparent 5px);
    pointer-events: none;
}

/* Brass gauge decoration */
.lab-ui::after {
    content: '';
    position: absolute;
    top: 15px;
    right: 15px;
    width: 80px;
    height: 80px;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="45" fill="none" stroke="%23daa520" stroke-width="4"/><circle cx="50" cy="50" r="35" fill="none" stroke="%23b8860b" stroke-width="2"/><path d="M50,15 L50,85" stroke="%23b8860b" stroke-width="3"/><path d="M15,50 L85,50" stroke="%23b8860b" stroke-width="3"/><circle cx="50" cy="50" r="8" fill="%23704214"/></svg>') center/contain no-repeat;
    opacity: 0.2;
    animation: rotateGear 25s linear infinite;
}

.control-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 25px;
    margin-bottom: 30px;
}

.control-group label {
    display: block;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--brass-light);
    font-size: 1rem;
    font-family: 'Crimson Text', serif;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
}

.control-group input {
    width: 100%;
    padding: 14px 18px;
    border: 3px solid var(--brass-dark);
    border-radius: 6px;
    font-size: 1.05rem;
    background: var(--parchment);
    color: var(--sepia-dark);
    transition: all 0.3s ease;
    font-family: 'Cormorant Garamond', serif;
    box-shadow: var(--shadow-inset);
}

.control-group input:focus {
    outline: none;
    border-color: var(--brass-light);
    box-shadow: 
        var(--shadow-inset),
        0 0 0 3px rgba(218, 165, 32, 0.3);
    background: var(--aged-cream);
}

.recommendation-target {
    background: 
        linear-gradient(135deg, var(--parchment) 0%, var(--aged-cream) 100%);
    padding: 30px;
    border-radius: 8px;
    border: 3px solid var(--brass);
    margin-bottom: 30px;
    box-shadow: var(--shadow-brass);
}

.recommendation-target > strong {
    display: block;
    color: var(--sepia-dark);
    font-size: 1.3rem;
    margin-bottom: 15px;
    font-family: 'Cinzel', Georgia, serif;
}

.shock-section {
    background: 
        linear-gradient(135deg, #f4e4c1 0%, #e8d4a8 100%);
    padding: 30px;
    border-radius: 8px;
    border: 3px solid var(--rust);
    margin-bottom: 30px;
    box-shadow: var(--shadow-deep);
    position: relative;
}

.shock-section::before {
    content: '⚠';
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 3rem;
    color: var(--rust);
    opacity: 0.2;
}

.shock-section strong {
    display: block;
    color: var(--rust);
    font-size: 1.4rem;
    margin-bottom: 10px;
    font-family: 'Cinzel', Georgia, serif;
}

.shock-description {
    color: var(--sepia-medium);
    font-size: 1rem;
    margin-bottom: 20px;
}

.shock-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 15px;
}

.shock-radio {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 18px;
    background: var(--parchment);
    border: 2px solid var(--brass-dark);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    color: var(--sepia-dark);
    box-shadow: var(--shadow-inset);
}

.shock-radio:hover {
    border-color: var(--rust);
    background: var(--aged-cream);
    box-shadow: 0 2px 8px rgba(141, 64, 4, 0.3);
}

.shock-radio input[type="radio"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--rust);
}

.shock-radio:has(input:checked) {
    border-color: var(--rust);
    background: linear-gradient(135deg, #f4e4c1 0%, #e8d4a8 100%);
    box-shadow: 0 4px 12px rgba(141, 64, 4, 0.4);
}

.time-path-section {
    margin-top: 50px;
    background: var(--parchment);
    padding: 40px;
    border-radius: 8px;
    box-shadow: var(--shadow-deep);
    border: 3px solid var(--brass-dark);
}

.time-path-section h3 {
    font-family: 'Cinzel', Georgia, serif;
    color: var(--sepia-dark);
    font-size: 2rem;
    margin-bottom: 15px;
}

.time-path-section p {
    color: var(--sepia-medium);
    margin-bottom: 25px;
    font-size: 1.1rem;
}

.shock-bar {
    background: linear-gradient(135deg, #f4e4c1 0%, #e8d4a8 100%);
    padding: 25px;
    border-radius: 8px;
    border: 3px dashed var(--rust);
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 18px;
    font-weight: 700;
    color: var(--rust);
    box-shadow: var(--shadow-brass);
}

.shock-bar input[type="checkbox"] {
    transform: scale(1.8);
    cursor: pointer;
    accent-color: var(--rust);
}

/* Brass Button with Rivets */
button#runBtn {
    width: 100%;
    padding: 28px;
    background: 
        linear-gradient(135deg, var(--brass-dark) 0%, var(--brass) 50%, var(--brass-light) 100%);
    color: var(--sepia-dark);
    border: 4px solid var(--bronze-dark);
    border-radius: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.4s ease;
    box-shadow: 
        0 8px 20px rgba(112, 66, 20, 0.5),
        inset 0 2px 4px rgba(255, 255, 255, 0.3),
        inset 0 -2px 4px rgba(0, 0, 0, 0.3);
    font-family: 'Cinzel', sans-serif;
    letter-spacing: 2px;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
    position: relative;
}

/* Button rivets */
button#runBtn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20px 50%, var(--bronze-dark) 6px, transparent 6px),
        radial-gradient(circle at calc(100% - 20px) 50%, var(--bronze-dark) 6px, transparent 6px);
    pointer-events: none;
    border-radius: 10px;
}

button#runBtn:hover {
    transform: translateY(-3px);
    box-shadow: 
        0 12px 30px rgba(112, 66, 20, 0.6),
        inset 0 2px 6px rgba(255, 255, 255, 0.4),
        inset 0 -2px 6px rgba(0, 0, 0, 0.4);
    background: linear-gradient(135deg, var(--brass) 0%, var(--brass-light) 50%, var(--brass-light) 100%);
}

button#runBtn:active {
    transform: translateY(0);
    box-shadow: 
        0 4px 15px rgba(112, 66, 20, 0.4),
        inset 0 3px 6px rgba(0, 0, 0, 0.4);
}

button#runBtn:disabled {
    background: linear-gradient(135deg, #a0826d 0%, #8b7355 100%);
    cursor: not-allowed;
    opacity: 0.6;
}

/* Output Area */
.res-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 40px;
    margin-top: 40px;
}

#text-log {
    background: 
        linear-gradient(135deg, var(--sepia-dark) 0%, #1c1410 100%);
    color: var(--brass-light);
    padding: 30px;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    line-height: 1.7;
    box-shadow: 
        var(--shadow-deep),
        inset 0 0 0 3px var(--brass-dark);
    border: 3px solid var(--bronze-dark);
    white-space: pre-wrap;
}

#rec-box {
    background: 
        linear-gradient(135deg, var(--parchment) 0%, var(--aged-cream) 100%);
    color: var(--sepia-dark);
    border: 4px solid var(--brass);
    padding: 30px;
    border-radius: 8px;
    margin-top: 25px;
    font-weight: 700;
    text-align: center;
    font-size: 1.4rem;
    box-shadow: var(--shadow-brass);
    font-family: 'Cinzel', Georgia, serif;
}

.img-wrap {
    background: var(--parchment);
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--shadow-deep);
    border: 3px solid var(--brass-dark);
}

.img-wrap img {
    width: 100%;
    border-radius: 4px;
    border: 2px solid var(--bronze-dark);
}

/* Metric Cards */
.metric-card {
    background: linear-gradient(135deg, var(--parchment) 0%, var(--aged-cream) 100%);
    padding: 25px;
    border-radius: 8px;
    border-left: 5px solid var(--brass);
    border-top: 2px solid var(--brass-dark);
    border-right: 2px solid var(--brass-dark);
    border-bottom: 2px solid var(--brass-dark);
    margin: 20px 0;
    box-shadow: var(--shadow-brass);
}

.metric-card h4 {
    color: var(--sepia-dark);
    font-size: 1.3rem;
    margin-bottom: 15px;
    font-family: 'Crimson Text', serif;
}

.metric-card .good {
    color: var(--verdigris);
    font-weight: 700;
}

.metric-card .ok {
    color: var(--patina);
    font-weight: 700;
}

.metric-card .warning {
    color: var(--brass-dark);
    font-weight: 700;
}

.metric-card .danger {
    color: var(--rust);
    font-weight: 700;
}

/* Loading Spinner - Rotating Gear */
.loading-spinner {
    display: inline-block;
    width: 24px;
    height: 24px;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 50 50"><circle cx="25" cy="25" r="20" fill="none" stroke="%23daa520" stroke-width="3"/><path d="M25,5 L25,15 M25,35 L25,45 M5,25 L15,25 M35,25 L45,25 M12,12 L18,18 M32,32 L38,38 M38,12 L32,18 M18,32 L12,38" stroke="%23daa520" stroke-width="3"/></svg>') center/contain no-repeat;
    animation: rotateGear 1.5s linear infinite;
    margin-left: 10px;
    vertical-align: middle;
}

/* Footer - Brass Plate */
footer {
    background: 
        linear-gradient(135deg, var(--sepia-dark) 0%, var(--sepia-medium) 100%);
    color: var(--parchment);
    padding: 40px 30px;
    text-align: center;
    margin-top: 80px;
    border-top: 5px solid var(--brass);
    box-shadow: var(--shadow-deep);
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: -5px;
    left: 0;
    right: 0;
    height: 5px;
    background: repeating-linear-gradient(90deg,
        var(--brass) 0px,
        var(--brass) 15px,
        var(--copper) 15px,
        var(--copper) 30px
    );
}

footer p {
    margin: 10px 0;
    color: var(--parchment-dark);
}

footer a {
    color: var(--brass-light);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

footer a:hover {
    color: var(--brass-light);
    text-shadow: 0 0 10px rgba(218, 165, 32, 0.6);
}

/* Model Cards for Home Page */
.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 40px;
    margin-top: 50px;
}

.model-card {
    background: 
        linear-gradient(135deg, var(--parchment) 0%, var(--aged-cream) 100%);
    padding: 40px;
    border-radius: 10px;
    border: 3px solid var(--brass-dark);
    box-shadow: var(--shadow-deep);
    transition: all 0.4s ease;
    position: relative;
}

/* Model card rivets */
.model-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 25px 25px, var(--brass-dark) 4px, transparent 4px),
        radial-gradient(circle at calc(100% - 25px) 25px, var(--brass-dark) 4px, transparent 4px),
        radial-gradient(circle at 25px calc(100% - 25px), var(--brass-dark) 4px, transparent 4px),
        radial-gradient(circle at calc(100% - 25px) calc(100% - 25px), var(--brass-dark) 4px, transparent 4px);
    pointer-events: none;
    border-radius: 10px;
}

.model-card:hover {
    transform: translateY(-8px);
    box-shadow: 
        0 15px 40px rgba(112, 66, 20, 0.5),
        inset 0 0 0 2px var(--brass);
}

.model-card .icon {
    font-size: 4rem;
    text-align: center;
    margin-bottom: 20px;
    color: var(--brass);
    text-shadow: 2px 2px 4px rgba(139, 105, 20, 0.3);
}

.model-card h3 {
    font-family: 'Cinzel', Georgia, serif;
    color: var(--sepia-dark);
    font-size: 1.8rem;
    margin-bottom: 10px;
    text-align: center;
}

.model-label {
    display: block;
    text-align: center;
    font-size: 0.85rem;
    color: var(--brass-dark);
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 20px;
    font-family: 'Crimson Text', serif;
}

.model-card p {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--sepia-medium);
    margin-bottom: 20px;
}

.use-cases {
    background: rgba(184, 134, 11, 0.1);
    padding: 20px;
    border-radius: 6px;
    border-left: 3px solid var(--brass);
    margin: 20px 0;
}

.use-cases strong {
    display: block;
    color: var(--brass-dark);
    margin-bottom: 10px;
    font-family: 'Crimson Text', serif;
}

.use-cases ul {
    margin-left: 20px;
}

.model-card .btn {
    display: inline-block;
    background: linear-gradient(135deg, var(--brass-dark) 0%, var(--brass) 100%);
    color: var(--parchment);
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 700;
    font-family: 'Crimson Text', serif;
    transition: all 0.3s ease;
    border: 2px solid var(--bronze-dark);
    box-shadow: 
        0 4px 12px rgba(112, 66, 20, 0.4),
        inset 0 1px 3px rgba(255, 255, 255, 0.3);
    margin-top: 15px;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.model-card .btn:hover {
    background: linear-gradient(135deg, var(--brass) 0%, var(--brass-light) 100%);
    transform: translateY(-2px);
    box-shadow: 
        0 6px 18px rgba(112, 66, 20, 0.5),
        inset 0 1px 4px rgba(255, 255, 255, 0.4);
}

/* Intro Section */
.intro-section {
    background: 
        linear-gradient(var(--parchment) 0%, var(--aged-cream) 100%);
    padding: 50px;
    border-radius: 10px;
    border: 3px solid var(--brass-dark);
    box-shadow: var(--shadow-deep);
    margin-bottom: 50px;
    position: relative;
}

.intro-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30px 30px, var(--brass-dark) 5px, transparent 5px),
        radial-gradient(circle at calc(100% - 30px) 30px, var(--brass-dark) 5px, transparent 5px),
        radial-gradient(circle at 30px calc(100% - 30px), var(--brass-dark) 5px, transparent 5px),
        radial-gradient(circle at calc(100% - 30px) calc(100% - 30px), var(--brass-dark) 5px, transparent 5px);
    pointer-events: none;
    border-radius: 10px;
}

.intro-section h2 {
    font-family: 'Cinzel', Georgia, serif;
    color: var(--sepia-dark);
    font-size: 2.5rem;
    margin-bottom: 25px;
    text-align: center;
    border-bottom: 3px double var(--brass);
    padding-bottom: 20px;
}

.intro-section p {
    font-size: 1.15rem;
    line-height: 1.8;
    color: var(--sepia-medium);
    margin-bottom: 20px;
}

/* Responsive */
@media (max-width: 900px) {
    .res-grid {
        grid-template-columns: 1fr;
    }
    
    .models-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 20px 15px;
    }
    
    nav .container {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .hero-header h1 {
        font-size: 2.5rem;
    }
    
    .page-header h1 {
        font-size: 2.5rem;
    }
    
    section {
        padding: 30px;
    }
    
    section h2 {
        font-size: 2rem;
    }
    
    .variable-sidebar {
        float: none;
        width: 100%;
        margin: 0 0 30px 0;
        position: relative;
        top: 0;
    }
    
    body::before,
    body::after {
        display: none;
    }
}