/* 
==================================================
CSS: Nordic Rail Archive - freshsignalshowcase.casa
==================================================
*/

:root {
    /* Colour Palette */
    --clr-deep-fjord: #071820;
    --clr-railway-blue: #163747;
    --clr-steel: #52666D;
    --clr-frost: #DDE8EB;
    --clr-snow: #F7FAFA;
    --clr-copper: #B9794F;
    --clr-signal-red: #C94F4F;
    --clr-nordic-blue: #4D91B2;
    --clr-muted-text: #A8B7BC;
    --clr-border: #2B424B;

    /* Typography */
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'Space Mono', 'Roboto Mono', monospace;
    --font-serif: 'Playfair Display', Georgia, serif; /* For editorial headlines */

    /* Layout */
    --max-width: 1200px;
    --header-height: 80px;
    --spacing-sm: 1rem;
    --spacing-md: 2.5rem;
    --spacing-lg: 5rem;
    --radius-sm: 4px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background-color: var(--clr-snow);
    color: var(--clr-deep-fjord);
    line-height: 1.6;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease;
}

ul {
    list-style: none;
}

/* Typography Classes */
h1, h2, h3, h4 {
    font-family: var(--font-serif);
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.label {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--clr-copper);
    display: block;
    margin-bottom: 0.5rem;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* Dark Mode Sections (Overrides) */
.bg-dark {
    background-color: var(--clr-deep-fjord);
    color: var(--clr-snow);
}

.bg-dark h1, .bg-dark h2, .bg-dark h3 {
    color: var(--clr-snow);
}

.bg-dark p {
    color: var(--clr-muted-text);
}

.bg-dark .border-line {
    border-color: var(--clr-border);
}

.bg-blue {
    background-color: var(--clr-railway-blue);
    color: var(--clr-snow);
}
.bg-blue p {
    color: var(--clr-frost);
}

.bg-light {
    background-color: var(--clr-snow);
    color: var(--clr-deep-fjord);
}

.bg-light p {
    color: var(--clr-steel);
}

/* Header & Navigation */
header {
    background-color: var(--clr-deep-fjord);
    color: var(--clr-snow);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--clr-border);
    height: var(--header-height);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.brand {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--clr-snow);
    display: flex;
    align-items: center;
    gap: 10px;
}
.brand span {
    color: var(--clr-copper);
}

.nav-desktop {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-desktop a {
    font-size: 0.85rem;
    color: var(--clr-muted-text);
}

.nav-desktop a:hover, .nav-desktop a.active {
    color: var(--clr-snow);
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
    font-family: var(--font-primary);
}

.btn:focus-visible {
    outline: 2px solid var(--clr-nordic-blue);
    outline-offset: 2px;
}

.btn-primary {
    background-color: var(--clr-copper);
    color: var(--clr-snow) !important;
}

.btn-primary:hover {
    background-color: #a36640;
}

.btn-outline {
    border-color: var(--clr-border);
    color: var(--clr-snow) !important;
}
.btn-outline:hover {
    background-color: var(--clr-railway-blue);
    border-color: var(--clr-nordic-blue);
}

.btn-dark {
    background-color: var(--clr-deep-fjord);
    color: var(--clr-snow) !important;
}

.hamburger {
    display: none;
    background: none;
    border: none;
    color: var(--clr-snow);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Mobile Nav */
.nav-mobile-overlay {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: var(--clr-deep-fjord);
    display: flex;
    flex-direction: column;
    padding: 2rem;
    transform: translateX(100%);
    transition: transform 0.3s ease-in-out;
    z-index: 999;
    overflow-y: auto;
}

.nav-mobile-overlay.active {
    transform: translateX(0);
}

.nav-mobile-overlay a {
    color: var(--clr-snow);
    font-size: 1.2rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--clr-border);
}

/* Hero Section */
.hero {
    position: relative;
    background-color: var(--clr-deep-fjord);
    min-height: 80vh;
    display: flex;
    align-items: center;
    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;
    padding: var(--spacing-lg) 0;
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    margin-bottom: 1.5rem;
}

.hero p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    max-width: 600px;
}

.hero-btns {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Info Strip */
.info-strip {
    background-color: var(--clr-railway-blue);
    border-top: 1px solid var(--clr-border);
    border-bottom: 1px solid var(--clr-border);
}

.info-strip ul {
    display: flex;
    overflow-x: auto;
    scrollbar-width: none;
    white-space: nowrap;
}
.info-strip ul::-webkit-scrollbar { display: none; }

.info-strip li a {
    display: block;
    padding: 1rem 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--clr-muted-text);
    border-right: 1px solid var(--clr-border);
}
.info-strip li:first-child a { border-left: 1px solid var(--clr-border); }
.info-strip li a:hover {
    background-color: var(--clr-deep-fjord);
    color: var(--clr-snow);
}

/* Section Spacing */
.section-pad {
    padding: var(--spacing-lg) 0;
}

/* Grids & Cards */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; }

.asymmetric-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 2rem;
}
.col-span-4 { grid-column: span 4; }
.col-span-8 { grid-column: span 8; }
.col-span-6 { grid-column: span 6; }
.col-span-12 { grid-column: span 12; }

.card {
    background: var(--clr-snow);
    border: 1px solid var(--clr-frost);
    display: flex;
    flex-direction: column;
    height: 100%;
}
.card-dark {
    background: var(--clr-deep-fjord);
    border: 1px solid var(--clr-border);
}

.card-img-wrapper {
    position: relative;
    padding-top: 60%; /* 16:9 ish */
    overflow: hidden;
    background: var(--clr-railway-blue);
}
.card-img-wrapper img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}
.card:hover .card-img-wrapper img {
    transform: scale(1.05);
}

.card-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}
.card-content h3 { font-size: 1.3rem; margin-bottom: 0.5rem; color: var(--clr-deep-fjord); }
.card-dark .card-content h3 { color: var(--clr-snow); }
.card-content p { font-size: 0.95rem; margin-bottom: 1.5rem; flex: 1; }
.card-dark .card-content p { color: var(--clr-muted-text); }

/* Technical Panels */
.tech-panel {
    background-color: var(--clr-frost);
    padding: 2rem;
    border-left: 4px solid var(--clr-nordic-blue);
    font-family: var(--font-mono);
    font-size: 0.9rem;
}
.bg-dark .tech-panel {
    background-color: var(--clr-railway-blue);
    border-left-color: var(--clr-copper);
    color: var(--clr-snow);
}

/* Horizontal Line Dividers */
.rail-divider {
    height: 4px;
    background: repeating-linear-gradient(
      90deg,
      var(--clr-border),
      var(--clr-border) 20px,
      transparent 20px,
      transparent 40px
    );
    margin: 2rem 0;
    opacity: 0.5;
}
.bg-light .rail-divider {
    background: repeating-linear-gradient(
      90deg,
      var(--clr-steel),
      var(--clr-steel) 20px,
      transparent 20px,
      transparent 40px
    );
    opacity: 0.2;
}

/* Timeline Components */
.timeline {
    position: relative;
    padding-left: 2rem;
    border-left: 2px solid var(--clr-copper);
}
.timeline-item {
    position: relative;
    margin-bottom: 3rem;
}
.timeline-item::before {
    content: '';
    position: absolute;
    left: -2.45rem;
    top: 0;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--clr-deep-fjord);
    border: 2px solid var(--clr-copper);
}
.timeline-period {
    font-family: var(--font-mono);
    color: var(--clr-copper);
    font-weight: bold;
    margin-bottom: 0.5rem;
}

/* Infrastructure Interactive Diagram */
.infra-diagram-container {
    position: relative;
    width: 100%;
    background: var(--clr-railway-blue);
    border: 1px solid var(--clr-border);
    overflow: hidden;
}
.infra-image {
    width: 100%;
    display: block;
    opacity: 0.7;
}
.infra-pin {
    position: absolute;
    width: 24px;
    height: 24px;
    background-color: var(--clr-signal-red);
    border: 2px solid var(--clr-snow);
    border-radius: 50%;
    cursor: pointer;
    transform: translate(-50%, -50%);
    transition: transform 0.2s;
    box-shadow: 0 0 10px rgba(0,0,0,0.5);
}
.infra-pin:hover, .infra-pin.active {
    transform: translate(-50%, -50%) scale(1.2);
    background-color: var(--clr-copper);
}
.infra-info-panel {
    background: var(--clr-snow);
    padding: 1.5rem;
    border-top: 4px solid var(--clr-nordic-blue);
    color: var(--clr-deep-fjord);
}
.infra-info-panel h3 { color: var(--clr-deep-fjord); margin-bottom: 0.5rem;}
.infra-content { display: none; }
.infra-content.active { display: block; animation: fadeIn 0.3s; }

/* Glossary Search */
.glossary-search {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    border: 1px solid var(--clr-border);
    background: var(--clr-deep-fjord);
    color: var(--clr-snow);
    margin-bottom: 2rem;
    font-family: var(--font-mono);
}
.glossary-search:focus {
    outline: none;
    border-color: var(--clr-nordic-blue);
}
.glossary-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}
.glossary-term {
    background: var(--clr-railway-blue);
    padding: 1.5rem;
    border: 1px solid var(--clr-border);
}
.glossary-term h3 {
    color: var(--clr-copper);
    font-family: var(--font-mono);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}
.glossary-term.hidden { display: none; }

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}
.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
}
.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--clr-steel);
    background: var(--clr-snow);
    color: var(--clr-deep-fjord);
    font-family: var(--font-primary);
}
.bg-dark .form-control {
    background: var(--clr-railway-blue);
    border-color: var(--clr-border);
    color: var(--clr-snow);
}
.form-control:focus {
    outline: 2px solid var(--clr-nordic-blue);
}
textarea.form-control {
    resize: vertical;
    min-height: 150px;
}
.form-msg {
    display: none;
    padding: 1rem;
    background: var(--clr-railway-blue);
    border-left: 4px solid var(--clr-copper);
    color: var(--clr-snow);
    margin-bottom: 1rem;
}
.form-msg.active { display: block; }

/* Footer */
footer {
    background-color: var(--clr-deep-fjord) !important;
    color: #A8B7BC !important;
    padding: 4rem 0 2rem;
    border-top: 1px solid var(--clr-border);
    margin-top: auto;
}
footer p, footer a, footer span, footer h4, footer ul, footer li {
    opacity: 1 !important;
    visibility: visible !important;
}
footer .brand {
    color: #F7FAFA !important;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}
.footer-col h4 {
    color: #F7FAFA !important;
    font-family: var(--font-mono);
    font-size: 1rem;
    margin-bottom: 1rem;
    text-transform: uppercase;
}
.footer-col p {
    color: #A8B7BC !important;
}
.footer-col ul li { margin-bottom: 0.5rem; }
.footer-col a {
    color: #A8B7BC !important;
}
.footer-col a:hover { color: #F7FAFA !important; }
.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--clr-border);
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    flex-wrap: wrap;
    gap: 1rem;
    color: #A8B7BC !important;
}
.footer-info { margin-bottom: 2rem; }
.address-block span:first-child {
    color: #A8B7BC !important;
}
.address-block span:last-child {
    color: #F7FAFA !important;
}

/* Page Header */
.page-header {
    background-color: var(--clr-railway-blue);
    padding: 4rem 0;
    border-bottom: 1px solid var(--clr-border);
    text-align: center;
}
.page-header h1 {
    color: var(--clr-snow);
    margin-bottom: 0.5rem;
}
.page-header p {
    color: var(--clr-frost);
    max-width: 600px;
    margin: 0 auto;
}

/* Breadcrumbs */
.breadcrumbs {
    padding: 1rem 0;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--clr-muted-text);
    background: var(--clr-deep-fjord);
    border-bottom: 1px solid var(--clr-border);
}
.breadcrumbs a { color: var(--clr-nordic-blue); }
.breadcrumbs a:hover { color: var(--clr-snow); }
.bg-light .breadcrumbs {
    background: var(--clr-snow);
    border-bottom-color: var(--clr-frost);
    color: var(--clr-steel);
}

/* Cookie Banner / Consent */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: #071820 !important;
    border-top: 2px solid #2B424B !important;
    color: #F7FAFA !important;
    padding: 1.5rem;
    z-index: 99999 !important;
    box-shadow: 0 -4px 10px rgba(0,0,0,0.5) !important;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.cookie-banner.hidden {
    display: none !important;
}
.cookie-content h3 { 
    font-family: var(--font-primary) !important; 
    font-size: 1.2rem !important; 
    margin-bottom: 0.5rem !important; 
    color: #F7FAFA !important; 
    opacity: 1 !important;
    visibility: visible !important;
}
.cookie-content p { 
    font-size: 0.9rem !important; 
    color: #DDE8EB !important; 
    opacity: 1 !important;
    visibility: visible !important;
}
.cookie-btns {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}
.cookie-btns button {
    opacity: 1 !important;
    visibility: visible !important;
}
.cookie-banner #btnAcceptAll,
.cookie-banner .btn-primary {
    background-color: #4D91B2 !important;
    color: #FFFFFF !important;
    border: 1px solid #4D91B2 !important;
}
.cookie-banner #btnAcceptAll:hover,
.cookie-banner .btn-primary:hover {
    background-color: #3A738F !important;
}
.cookie-banner #btnReject,
.cookie-banner .btn-outline {
    background-color: transparent !important;
    color: #F7FAFA !important;
    border: 1px solid #2B424B !important;
}
.cookie-banner #btnReject:hover,
.cookie-banner .btn-outline:hover {
    background-color: #163747 !important;
    border-color: #4D91B2 !important;
}
.cookie-banner #btnManage,
.cookie-banner .btn-dark {
    background-color: transparent !important;
    color: #F7FAFA !important;
    border: 1px solid transparent !important;
    text-decoration: underline !important;
}
.cookie-banner #btnManage:hover,
.cookie-banner .btn-dark:hover {
    color: #DDE8EB !important;
}

.cookie-settings-modal {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #071820 !important;
    color: #F7FAFA !important;
    padding: 2rem;
    width: 90%;
    max-width: 500px;
    z-index: 100000 !important;
    border: 1px solid #2B424B !important;
    box-shadow: 0 10px 30px rgba(0,0,0,0.8) !important;
}
.cookie-settings-modal.active { display: block !important; }
.cookie-settings-modal h3 { 
    color: #F7FAFA !important; 
    opacity: 1 !important; 
    visibility: visible !important;
}
.cookie-settings-modal p { 
    color: #DDE8EB !important; 
    opacity: 1 !important; 
    visibility: visible !important;
}
.cookie-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.8) !important;
    z-index: 99998 !important;
}
.cookie-overlay.active { display: block !important; }
.cookie-option { 
    margin: 1rem 0 !important; 
    padding-bottom: 1rem !important; 
    border-bottom: 1px solid #2B424B !important; 
}
.cookie-option label { 
    color: #F7FAFA !important; 
    font-weight: bold !important; 
    opacity: 1 !important; 
    visibility: visible !important;
    display: flex !important; 
    justify-content: space-between !important; 
    align-items: center !important;
}
.cookie-option p { 
    color: #DDE8EB !important; 
    font-size: 0.85rem !important; 
    margin-top: 0.5rem !important; 
    opacity: 1 !important; 
    visibility: visible !important;
}
.cookie-settings-modal #btnSaveSettings,
.cookie-settings-modal .btn-primary {
    background-color: #4D91B2 !important;
    color: #FFFFFF !important;
    border: 1px solid #4D91B2 !important;
    opacity: 1 !important;
    visibility: visible !important;
}
.cookie-settings-modal #btnSaveSettings:hover,
.cookie-settings-modal .btn-primary:hover {
    background-color: #3A738F !important;
}

/* Editorial Image styling */
.editorial-img {
    width: 100%;
    border: 1px solid var(--clr-border);
    margin: 2rem 0;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Content specific text visibility rules */
.bg-fjord { background-color: var(--clr-deep-fjord); color: var(--clr-snow); }
.bg-fjord p { color: var(--clr-muted-text); }
.bg-fjord h1, .bg-fjord h2, .bg-fjord h3 { color: var(--clr-snow); }

/* Responsive Breakpoints */
@media (max-width: 1200px) {
    .asymmetric-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .col-span-4, .col-span-8, .col-span-6 {
        grid-column: span 1;
    }
    .col-span-12 {
        grid-column: span 2;
    }
}

@media (max-width: 992px) {
    .nav-desktop {
        display: none;
    }
    .hamburger {
        display: block;
    }
    .hero h1 { font-size: 3rem; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .grid-2 { grid-template-columns: 1fr; }
    .asymmetric-grid {
        grid-template-columns: 1fr;
    }
    .col-span-4, .col-span-8, .col-span-6, .col-span-12 {
        grid-column: span 1;
    }
    .hero { min-height: 60vh; }
    .hero h1 { font-size: 2.5rem; }
    .cookie-btns { flex-direction: column; }
    .btn { width: 100%; }
}

@media (max-width: 480px) {
    .footer-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 2rem; }
    .info-strip li a { padding: 1rem; }
}