/* ============================================
   Adelaide University CyberLab — Styles
   Dark cyber/tech aesthetic, professional tone
   ============================================ */

/* --- CSS Variables --- */
:root {
    --color-bg: #0a0e17;
    --color-bg-light: #111827;
    --color-bg-card: #1a2235;
    --color-bg-card-hover: #1f2a40;
    --color-surface: #0f1520;
    --color-text: #e2e8f0;
    --color-text-muted: #94a3b8;
    --color-text-dim: #64748b;
    --color-accent: #38bdf8;
    --color-accent-dim: #0ea5e9;
    --color-teal: #2dd4bf;
    --color-red: #f87171;
    --color-amber: #fbbf24;
    --color-border: #1e293b;
    --color-border-light: #334155;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --max-width: 1200px;
    --nav-height: 72px;
}

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

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

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.2s;
}

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* --- Navigation --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    z-index: 1000;
    background: rgba(10, 14, 23, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: background 0.3s, border-color 0.3s;
}

.navbar.scrolled {
    background: rgba(10, 14, 23, 0.95);
    border-bottom-color: var(--color-border);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text);
    font-weight: 600;
    font-size: 1.1rem;
}

.nav-logo:hover {
    color: var(--color-text);
}

.logo-img {
    height: 36px;
    width: auto;
}

.logo-text {
    font-weight: 700;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    list-style: none;
}

.nav-links a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 450;
    padding: 0.5rem 0.875rem;
    border-radius: 6px;
    transition: color 0.2s, background 0.2s;
}

.nav-links a:hover {
    color: var(--color-text);
    background: rgba(255, 255, 255, 0.05);
}

.nav-cta {
    background: rgba(56, 189, 248, 0.12) !important;
    color: var(--color-accent) !important;
    border: 1px solid rgba(56, 189, 248, 0.2);
}

.nav-cta:hover {
    background: rgba(56, 189, 248, 0.2) !important;
    color: var(--color-accent) !important;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text-muted);
    transition: transform 0.3s, opacity 0.3s;
}

/* --- Hero Section --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-bg-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(10, 14, 23, 0.6) 0%,
        rgba(10, 14, 23, 0.75) 50%,
        rgba(10, 14, 23, 0.95) 100%
    );
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 2rem;
    max-width: 800px;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 1.25rem;
}

.hero-title-accent {
    background: linear-gradient(135deg, var(--color-accent), var(--color-teal));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    font-weight: 400;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    letter-spacing: 0.01em;
}

.hero-description {
    font-size: 1rem;
    color: var(--color-text-dim);
    max-width: 600px;
    margin: 0 auto 2.5rem;
    line-height: 1.6;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-accent);
    font-size: 0.95rem;
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border: 1px solid rgba(56, 189, 248, 0.3);
    border-radius: 8px;
    transition: all 0.3s;
}

.hero-cta:hover {
    background: rgba(56, 189, 248, 0.1);
    border-color: rgba(56, 189, 248, 0.5);
    color: var(--color-accent);
    transform: translateY(2px);
}

.hero-cta svg {
    animation: bounceDown 2s infinite;
}

@keyframes bounceDown {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(4px); }
}

/* --- Section Base --- */
.section {
    padding: 7rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}

.section-label {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 1rem;
    padding: 0.3rem 0.8rem;
    background: rgba(56, 189, 248, 0.08);
    border: 1px solid rgba(56, 189, 248, 0.15);
    border-radius: 4px;
}

.section-header h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 1.25rem;
}

.section-intro {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* --- Section: Problem --- */
.section-problem {
    background: var(--color-bg);
}

.cascade-narrative {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
    margin-bottom: 5rem;
}

.cascade-image img {
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.cascade-scenario h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.cascade-scenario > p {
    color: var(--color-text-muted);
    margin-bottom: 1.25rem;
}

.incidents-section {
    margin-bottom: 4rem;
}

.incidents-section h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.incident-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

.incident-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
    transition: border-color 0.3s;
}

.incident-card:hover {
    border-color: var(--color-border-light);
}

.incident-year {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-red);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.incident-card h4 {
    font-size: 1rem;
    font-weight: 600;
    margin: 0.25rem 0 0.5rem;
}

.incident-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.incident-source {
    display: inline-block;
    margin-top: 0.75rem;
    font-size: 0.8rem;
    font-family: var(--font-mono);
    color: var(--color-accent);
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.incident-source:hover {
    opacity: 1;
    text-decoration: underline;
}

.incidents-note {
    margin-top: 1.25rem;
    font-size: 0.85rem;
    color: var(--color-text-dim);
    line-height: 1.6;
}

.incidents-note a {
    color: var(--color-accent);
    text-decoration: none;
}

.incidents-note a:hover {
    text-decoration: underline;
}

/* Systems showcase */
.systems-showcase {
    margin-top: 2rem;
}

.systems-showcase h3 {
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 0.75rem;
}

.systems-intro {
    text-align: center;
    color: var(--color-text-muted);
    max-width: 700px;
    margin: 0 auto 2.5rem;
}

.systems-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
}

.system-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 1.5rem;
    transition: all 0.3s;
}

.system-card:hover {
    border-color: var(--color-accent);
    background: var(--color-bg-card-hover);
    transform: translateY(-2px);
}

.system-icon {
    width: 40px;
    height: 40px;
    margin-bottom: 1rem;
    color: var(--color-accent);
}

.system-icon svg {
    width: 100%;
    height: 100%;
}

.system-card h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.system-card p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.55;
}

/* --- Zone Reveal --- */
.zone-reveal {
    margin-top: 2rem;
}

.zone-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 3px;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.zone-tile {
    position: relative;
    aspect-ratio: 688 / 768;
    cursor: pointer;
    overflow: hidden;
}

.zone-tile-front {
    position: absolute;
    inset: 0;
    background: var(--color-bg-card);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 1.5rem 1rem;
    transition: opacity 0.5s ease, transform 0.5s ease;
    z-index: 2;
}

.zone-tile:hover .zone-tile-front:not(.revealed) {
    background: var(--color-bg-card-hover);
}

.zone-tile-front.revealed {
    opacity: 0;
    transform: scale(0.95);
    pointer-events: none;
}

.zone-tile-icon {
    width: 36px;
    height: 36px;
    color: var(--color-accent);
    margin-bottom: 0.75rem;
}

.zone-tile-icon svg {
    width: 100%;
    height: 100%;
}

.zone-tile-front h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--color-text);
}

.zone-tile-front p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    max-width: 180px;
}

.zone-tile-back {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.zone-tile-back img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.zone-hint {
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-dim);
    margin-top: 1rem;
    font-style: italic;
    transition: opacity 0.4s;
}

.zone-hint.hidden {
    opacity: 0;
}

.zone-complete {
    text-align: center;
    font-size: 0.95rem;
    color: var(--color-teal);
    font-weight: 500;
    margin-top: 1rem;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.6s, transform 0.6s;
}

.zone-complete.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Image disclaimer */
.image-disclaimer {
    display: block;
    text-align: center;
    font-size: 0.7rem;
    color: var(--color-text-dim);
    margin-top: 0.5rem;
    font-style: italic;
    opacity: 0.7;
}

/* --- Section: CROS --- */
.section-cros {
    background: var(--color-bg-light);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.cros-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.cros-image img {
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.cros-explanation {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.cros-explanation h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.cros-explanation p {
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* CROS lower: full-width content below the image+text grid */
.cros-lower {
    margin-top: 3.5rem;
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.cros-lower h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.cros-lower p {
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* Analogy diagram */
.analogy-diagram {
    display: flex;
    flex-direction: column;
    gap: 0;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    overflow: hidden;
}

.analogy-layer {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg-card);
}

.analogy-layer:last-child {
    border-bottom: none;
}

.analogy-layer-os {
    background: rgba(56, 189, 248, 0.08);
    border-left: 3px solid var(--color-accent);
}

.analogy-label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

.analogy-label.accent {
    color: var(--color-accent);
    font-weight: 700;
    font-size: 1.1rem;
}

.analogy-arrow {
    color: var(--color-text-dim);
    font-size: 1.2rem;
    padding: 0 1rem;
}

/* Capabilities */
.capabilities-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
}

.capability {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1.25rem;
}

.capability h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-teal);
    margin-bottom: 0.4rem;
}

.capability p {
    font-size: 0.85rem;
    line-height: 1.55;
}

/* Network cards (Game-Net / Management-Net) */

.network-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.network-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
    border-top: 3px solid var(--color-border);
}

.network-card-game {
    border-top-color: var(--color-accent);
}

.network-card-mgmt {
    border-top-color: var(--color-teal);
}

.network-label {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.03em;
}

.network-card-game .network-label {
    color: var(--color-accent);
}

.network-card-mgmt .network-label {
    color: var(--color-teal);
}

.network-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.65;
    margin-top: 0.5rem;
}

.network-explanation p {
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.network-explanation p:last-child {
    margin-bottom: 0;
    color: var(--color-text);
    font-weight: 400;
}

/* --- Section: Model --- */
.section-model {
    background: var(--color-bg);
}

.model-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.model-content-stacked {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.model-image img {
    border-radius: 12px;
    border: 1px solid var(--color-border);
    position: sticky;
    top: calc(var(--nav-height) + 2rem);
}

.model-image-full {
    width: 100%;
}

.model-image-full img {
    width: 100%;
    position: static;
}

.model-blocks-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.model-explanation {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.model-block h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.model-block p {
    color: var(--color-text-muted);
    line-height: 1.7;
}

.model-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin-top: 1rem;
    grid-column: 1 / -1;
}

.stat {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 1.5rem;
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* --- Section: Teaching --- */
.section-teaching {
    background: var(--color-bg-light);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.teaching-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.teaching-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 2rem;
    transition: border-color 0.3s;
}

.teaching-card:hover {
    border-color: var(--color-border-light);
}

.teaching-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.teaching-card p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* AI Policy block */
.ai-policy {
    margin-bottom: 3rem;
    padding: 2.5rem;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-accent);
    border-radius: 10px;
}

.ai-policy h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--color-accent);
}

.ai-policy-text p {
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.ai-policy-text p:last-child {
    margin-bottom: 0;
}

.ai-policy-text em {
    color: var(--color-text);
    font-style: italic;
}

.teaching-image {
    max-width: 800px;
    margin: 0 auto;
}

.teaching-image img {
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

/* --- Section: Defence --- */
.section-defence {
    background: var(--color-bg);
}

.defence-feature {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    margin-bottom: 4rem;
}

.defence-feature-image img {
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.defence-feature-text h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.defence-feature-text p {
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.defence-feature-text p:last-child {
    margin-bottom: 0;
}

.defence-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.defence-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 2rem;
    transition: border-color 0.3s;
}

.defence-card:hover {
    border-color: var(--color-border-light);
}

.defence-card-image {
    margin: -2rem -2rem 1.5rem -2rem;
    overflow: hidden;
    border-radius: 10px 10px 0 0;
}

.defence-card-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.defence-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.defence-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.65;
}

/* --- Section: Join --- */
.section-join {
    background: var(--color-bg-light);
    border-top: 1px solid var(--color-border);
}

.join-cards {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.join-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 2rem;
}

.join-card-primary {
    grid-column: 1;
    grid-row: 1 / 3;
    border-color: var(--color-accent);
    background: rgba(56, 189, 248, 0.04);
}

.join-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.join-card p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

.join-details {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.join-detail {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.join-detail svg {
    color: var(--color-accent);
    flex-shrink: 0;
}

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

.github-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 0.6rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 0.85rem;
    font-family: var(--font-mono);
    transition: all 0.2s;
}

.github-link:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--color-border-light);
}

.cascade-gif-section {
    text-align: center;
}

.cascade-gif {
    max-width: 900px;
    margin: 0 auto;
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

/* --- Footer --- */
.footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2.5fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-logo {
    height: 48px;
    width: auto;
    margin-bottom: 1rem;
    filter: brightness(0.9);
}

.footer-org {
    font-size: 0.85rem;
    color: var(--color-text-dim);
    line-height: 1.6;
}

.footer-people {
    display: flex;
    gap: 3rem;
}

.footer-group h4 {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
}

.footer-group ul {
    list-style: none;
}

.footer-group li {
    font-size: 0.85rem;
    color: var(--color-text-dim);
    line-height: 1.8;
}

.footer-group a {
    color: var(--color-text-dim);
}

.footer-group a:hover {
    color: var(--color-accent);
}

.footer-links h4 {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
}

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

.footer-links li {
    font-size: 0.85rem;
    line-height: 1.8;
}

.footer-links a {
    color: var(--color-text-dim);
}

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

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: 1.5rem;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--color-text-dim);
}

/* --- Scroll Animations --- */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .systems-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .cascade-narrative {
        grid-template-columns: 1fr;
    }

    .cros-content {
        grid-template-columns: 1fr;
    }

    .model-content {
        grid-template-columns: 1fr;
    }

    .model-blocks-grid {
        grid-template-columns: 1fr;
    }

    .model-image img {
        position: static;
    }

    .defence-feature {
        grid-template-columns: 1fr;
    }

    .defence-grid {
        grid-template-columns: 1fr 1fr;
    }

    .join-cards {
        grid-template-columns: 1fr;
    }

    .join-card-primary {
        grid-column: 1;
        grid-row: auto;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-people {
        flex-direction: column;
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 4rem 0;
    }

    .section-header {
        margin-bottom: 2.5rem;
    }

    .zone-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .zone-tile-front p {
        display: none;
    }

    .zone-tile-front h4 {
        font-size: 0.85rem;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: rgba(10, 14, 23, 0.98);
        flex-direction: column;
        padding: 1rem 2rem 1.5rem;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .systems-grid {
        grid-template-columns: 1fr;
    }

    .capabilities-grid {
        grid-template-columns: 1fr;
    }

    .network-cards {
        grid-template-columns: 1fr;
    }

    .teaching-grid {
        grid-template-columns: 1fr;
    }

    .model-stats {
        grid-template-columns: 1fr;
    }

    .defence-grid {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .analogy-diagram {
        font-size: 0.85rem;
    }

    .analogy-layer {
        padding: 0.75rem 1rem;
    }

    .analogy-arrow {
        padding: 0 0.5rem;
    }
}