:root {
    /* Colour Palette */
    --deep-atlantic: #082B36;
    --harbour-blue: #145263;
    --sea-glass: #73B7B2;
    --mist: #E8F0ED;
    --sand: #D9C7A7;
    --beacon-amber: #E7A94B;
    --rust: #A95C43;
    --slate: #52666B;
    --white: #FFFFFF;

    /* Typography */
    --font-heading: "Helvetica Neue", Arial, sans-serif;
    --font-body: "Georgia", serif;
    --font-label: "Courier New", Courier, monospace;

    /* Spacing & Layout */
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;
    --container-width: 1200px;
    
    /* UI */
    --border-radius: 4px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: var(--font-body);
    color: var(--deep-atlantic);
    background-color: var(--mist);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography Base */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--deep-atlantic);
    letter-spacing: -0.02em;
}

.label {
    font-family: var(--font-label);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    font-size: 0.85rem;
    color: var(--slate);
    display: block;
    margin-bottom: var(--spacing-sm);
}

.archive-number {
    font-family: var(--font-heading);
    font-size: 3rem;
    color: var(--sea-glass);
    font-weight: 700;
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--harbour-blue);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--rust);
}

/* Layout Utilities */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid rgba(82, 102, 107, 0.2);
}

.section-dark {
    background-color: var(--deep-atlantic);
    color: var(--mist);
}

.section-dark h2, .section-dark h3, .section-dark p {
    color: var(--mist);
}

.section-dark .label {
    color: var(--sea-glass);
}

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-6 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }

@media (max-width: 768px) {
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* Header & Navigation */
header {
    background-color: var(--deep-atlantic);
    color: var(--white);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 2px solid var(--beacon-amber);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.logo span {
    color: var(--beacon-amber);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-links a {
    color: var(--mist);
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--beacon-amber);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 1200px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--deep-atlantic);
        flex-direction: column;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--harbour-blue);
    }
    .nav-links.active {
        display: flex;
    }
    .mobile-menu-btn {
        display: block;
    }
}

/* Hero Section */
.hero {
    position: relative;
    background-color: var(--deep-atlantic);
    color: var(--white);
    padding: 6rem 0;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.4;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--harbour-blue);
    color: var(--white);
    font-family: var(--font-heading);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    border: none;
    cursor: pointer;
    border-radius: var(--border-radius);
    text-align: center;
}

.btn:hover {
    background-color: var(--beacon-amber);
    color: var(--deep-atlantic);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--beacon-amber);
    color: var(--beacon-amber);
}

.btn-outline:hover {
    background-color: var(--beacon-amber);
    color: var(--deep-atlantic);
}

.btn-group {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* Cards */
.card {
    background-color: var(--white);
    border: 1px solid rgba(82, 102, 107, 0.2);
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(8, 43, 54, 0.1);
}

.card-img-wrapper {
    position: relative;
    padding-top: 60%;
    overflow: hidden;
    background-color: var(--slate);
}

.card-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-content {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.card h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.5rem;
}

.card p {
    color: var(--slate);
    flex-grow: 1;
}

.card .btn {
    margin-top: var(--spacing-md);
    align-self: flex-start;
}

/* Interactive Diagram */
.diagram-container {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    background: var(--deep-atlantic);
    border: 1px solid var(--harbour-blue);
    padding: 2rem;
}

.diagram-image {
    width: 100%;
    height: auto;
    display: block;
    opacity: 0.8;
}

.diagram-point {
    position: absolute;
    width: 24px;
    height: 24px;
    background-color: var(--beacon-amber);
    border-radius: 50%;
    cursor: pointer;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 0 4px rgba(231, 169, 75, 0.3);
    transition: var(--transition);
    z-index: 10;
}

.diagram-point:hover, .diagram-point.active {
    background-color: var(--rust);
    box-shadow: 0 0 0 8px rgba(169, 92, 67, 0.4);
}

.diagram-panel {
    display: none;
    background: var(--white);
    padding: var(--spacing-md);
    border: 1px solid var(--slate);
    margin-top: var(--spacing-md);
}

.diagram-panel.active {
    display: block;
}

/* Warning Banner */
.nav-warning {
    background-color: var(--rust);
    color: var(--white);
    padding: var(--spacing-md);
    text-align: center;
    font-family: var(--font-heading);
    font-weight: bold;
    border-radius: var(--border-radius);
    margin: var(--spacing-lg) 0;
}

/* Glossary & FAQ */
.search-bar {
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
    border: 1px solid var(--slate);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    font-family: var(--font-heading);
}

.glossary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.glossary-term {
    background: var(--white);
    padding: var(--spacing-md);
    border-left: 4px solid var(--sea-glass);
}

.glossary-term dt {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--deep-atlantic);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.glossary-term dd {
    color: var(--slate);
}

details {
    background: var(--white);
    border: 1px solid var(--slate);
    margin-bottom: var(--spacing-sm);
    border-radius: var(--border-radius);
}

summary {
    padding: 1rem;
    font-family: var(--font-heading);
    font-weight: bold;
    cursor: pointer;
    background: var(--mist);
}

details p {
    padding: 1rem;
    margin: 0;
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-family: var(--font-heading);
    font-weight: 600;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--slate);
    border-radius: var(--border-radius);
    font-family: var(--font-body);
}

textarea.form-control {
    min-height: 150px;
    resize: vertical;
}

/* Footer */
footer {
    background-color: var(--deep-atlantic);
    color: var(--mist);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    border-top: 4px solid var(--sea-glass);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.footer-col h4 {
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: var(--sea-glass);
}

.footer-links a:hover {
    color: var(--white);
}

.footer-disclaimer {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-md);
    font-size: 0.85rem;
    color: rgba(232, 240, 237, 0.7);
    text-align: center;
}

/* Cookie Banner */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: var(--harbour-blue);
    color: var(--white);
    padding: var(--spacing-md);
    z-index: 9999;
    display: none;
    box-shadow: 0 -5px 15px rgba(0,0,0,0.2);
}

.cookie-content {
    max-width: var(--container-width);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.cookie-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.cookie-banner p { margin-bottom: 0; font-size: 0.9rem;}

@media (min-width: 768px) {
    .cookie-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

/* Accessibility */
:focus {
    outline: 3px solid var(--beacon-amber);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}