/* CSS Variables - Slate Palette */
:root {
    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-200: #e2e8f0;
    --slate-300: #cbd5e1;
    --slate-400: #94a3b8;
    --slate-500: #64748b;
    --slate-600: #475569;
    --slate-700: #334155;
    --slate-800: #1e293b;
    --slate-900: #0f172a;
    --accent-blue: #38bdf8;
    
    --font-sans: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--slate-800);
    background-color: var(--slate-50);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Global Image Rule */
img {
    width: 100%;
    height: auto;
    object-fit: cover;
    display: block;
}

/* Typography */
.aeth-h1-prime {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    color: var(--slate-900);
    margin-bottom: 1.5rem;
}

.aeth-h2-sec {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    font-weight: 600;
    color: var(--slate-900);
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
}

.aeth-h3-card {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--slate-800);
    margin-bottom: 1rem;
}

/* Header */
.aeth-masthead {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--slate-200);
}

.aeth-masthead-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.aeth-brand-mark {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.aeth-brand-text {
    font-family: var(--font-mono);
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--slate-900);
}

.aeth-nav-cluster {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.aeth-nav-node {
    text-decoration: none;
    color: var(--slate-600);
    font-weight: 600;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

.aeth-nav-node:hover {
    color: var(--slate-900);
}

.aeth-ghost-link {
    display: none; /* Hide non-essential link on smaller screens */
}

/* Hero - Split Layout */
.aeth-hero-bifurcated {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 85vh;
    background-color: var(--slate-100);
}

.aeth-hero-data-pane {
    padding: 6rem 4rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.aeth-sys-status {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--slate-200);
    padding: 0.25rem 0.75rem;
    border-radius: 99px;
    font-size: 0.8rem;
    font-family: var(--font-mono);
    color: var(--slate-700);
    margin-bottom: 2rem;
    align-self: flex-start;
}

.aeth-status-indicator {
    width: 8px;
    height: 8px;
    background-color: #10b981; /* green */
    border-radius: 50%;
}

.aeth-hero-sub-data {
    font-size: 1.125rem;
    color: var(--slate-600);
    margin-bottom: 2.5rem;
    max-width: 90%;
}

.aeth-hero-metrics {
    display: flex;
    gap: 3rem;
    margin-bottom: 3rem;
    border-left: 2px solid var(--slate-300);
    padding-left: 1.5rem;
}

.aeth-metric-node {
    display: flex;
    flex-direction: column;
}

.aeth-metric-val {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--slate-900);
}

.aeth-metric-lbl {
    font-size: 0.85rem;
    color: var(--slate-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.aeth-trigger-primary {
    display: inline-block;
    background-color: var(--slate-900);
    color: white;
    padding: 1rem 2rem;
    text-decoration: none;
    font-weight: 600;
    border-radius: 4px;
    transition: background-color 0.2s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.aeth-trigger-primary:hover {
    background-color: var(--slate-700);
}

.aeth-hero-visual-pane {
    position: relative;
}

.aeth-hero-visual-pane img {
    height: 100%;
}

.aeth-img-overlay-data {
    position: absolute;
    bottom: 2rem;
    right: 2rem;
    background: rgba(15, 23, 42, 0.85);
    color: white;
    padding: 1rem 1.5rem;
    backdrop-filter: blur(4px);
    max-width: 300px;
}

.aeth-overlay-txt {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.4;
}

/* About Section - Vertical Rhythm Leakage */
.aeth-intel-module {
    padding: 8rem 2rem 5rem 2rem; /* Asymmetric padding */
    max-width: 1200px;
    margin: 0 auto;
}

.aeth-intel-grid {
    display: grid;
    grid-template-columns: 5fr 7fr;
    gap: 4rem;
    align-items: center;
}

.aeth-rounded-edge {
    border-radius: 8px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.aeth-body-prose {
    font-size: 1.1rem;
    color: var(--slate-600);
    margin-bottom: 1.5rem;
}

.aeth-inline-ref {
    color: var(--slate-900);
    text-decoration: underline;
    text-decoration-color: var(--slate-400);
    text-underline-offset: 4px;
}

/* Tabs Component */
.aeth-protocol-tabs {
    margin-top: 2.5rem;
    border: 1px solid var(--slate-200);
    border-radius: 6px;
    overflow: hidden;
}

.aeth-tab-headers {
    display: flex;
    background: var(--slate-100);
    border-bottom: 1px solid var(--slate-200);
}

.aeth-tab-btn {
    flex: 1;
    padding: 1rem;
    background: none;
    border: none;
    border-right: 1px solid var(--slate-200);
    cursor: pointer;
    font-weight: 600;
    color: var(--slate-500);
    transition: all 0.2s;
}

.aeth-tab-btn:last-child {
    border-right: none;
}

.aeth-tab-btn.active {
    background: white;
    color: var(--slate-900);
    border-bottom: 2px solid var(--slate-900);
}

.aeth-tab-panes {
    padding: 2rem;
    background: white;
}

.aeth-tab-pane {
    display: none;
}

.aeth-tab-pane.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

.aeth-micro-disclaimer {
    font-size: 0.75rem;
    color: var(--slate-400);
    margin-top: 1rem;
    font-style: italic;
}

/* Services - Asymmetric Grid */
.aeth-vectors-module {
    background-color: var(--slate-900);
    color: white;
    padding: 6rem 2rem 8rem 2rem;
}

.aeth-vectors-header {
    max-width: 1200px;
    margin: 0 auto 4rem auto;
}

.aeth-vectors-header .aeth-h2-sec {
    color: white;
}

.aeth-sub-prose {
    color: var(--slate-300);
    font-size: 1.2rem;
}

.aeth-vectors-asym-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.aeth-vector-card {
    background: var(--slate-800);
    padding: 2.5rem;
    border-top: 3px solid var(--slate-600);
    display: flex;
    flex-direction: column;
}

.aeth-vector-card.aeth-span-2 {
    grid-column: span 2;
}

.aeth-vector-card .aeth-h3-card {
    color: white;
}

.aeth-card-prose {
    color: var(--slate-300);
    margin-bottom: 2rem;
    flex-grow: 1;
}

.aeth-benefit-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-blue);
    background: rgba(56, 189, 248, 0.1);
    padding: 0.5rem 1rem;
    align-self: flex-start;
}

.aeth-vector-img-block {
    grid-column: span 2;
    height: 100%;
    min-height: 300px;
}

.aeth-grayscale {
    filter: grayscale(100%) opacity(0.8);
    height: 100%;
}

/* Testimonials */
.aeth-telemetry-module {
    padding: 7rem 2rem;
    background: var(--slate-50);
}

.aeth-telemetry-wrapper {
    max-width: 1000px;
    margin: 0 auto;
}

.aeth-text-center {
    text-align: center;
    margin-bottom: 4rem;
}

.aeth-feedback-array {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.aeth-feedback-node {
    background: white;
    padding: 3rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    border-left: 4px solid var(--slate-300);
    max-width: 800px;
}

.aeth-node-offset {
    align-self: flex-end;
    border-left: none;
    border-right: 4px solid var(--slate-800);
}

.aeth-feedback-meta {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.aeth-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
}

.aeth-client-name {
    display: block;
    font-size: 1.1rem;
    color: var(--slate-900);
}

.aeth-client-title {
    font-size: 0.9rem;
    color: var(--slate-500);
}

.aeth-quote {
    font-size: 1.15rem;
    font-style: italic;
    color: var(--slate-700);
    line-height: 1.7;
}

/* Contact Form */
.aeth-intake-module {
    padding: 5rem 2rem 8rem 2rem;
    background: white;
}

.aeth-intake-split {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6rem;
    align-items: center;
}

.aeth-intake-visual {
    position: relative;
}

.aeth-cert-badge {
    position: absolute;
    bottom: -20px;
    right: -20px;
    background: var(--slate-900);
    color: white;
    padding: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    border: 4px solid white;
}

.aeth-form-context {
    color: var(--slate-600);
    margin-bottom: 2.5rem;
}

.aeth-form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.aeth-full-width {
    grid-column: span 2;
}

.aeth-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.aeth-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--slate-700);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.aeth-input, .aeth-textarea {
    padding: 0.75rem 1rem;
    border: 1px solid var(--slate-300);
    background: var(--slate-50);
    border-radius: 4px;
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: border-color 0.2s;
}

.aeth-input:focus, .aeth-textarea:focus {
    outline: none;
    border-color: var(--slate-600);
}

.aeth-submit-btn {
    width: 100%;
    margin-top: 1rem;
}

/* Footer */
.aeth-base-footer {
    background: var(--slate-900);
    color: var(--slate-300);
    padding: 5rem 2rem 2rem 2rem;
    border-top: 1px solid var(--slate-800);
}

.aeth-footer-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 4rem;
    margin-bottom: 4rem;
}

.aeth-footer-brand {
    color: white;
    font-size: 1.2rem;
    display: block;
    margin-bottom: 1rem;
}

.aeth-footer-prose {
    font-size: 0.9rem;
    max-width: 250px;
}

.aeth-footer-h4 {
    color: white;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
}

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

.aeth-footer-list li {
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
}

.aeth-footer-list a, .aeth-address {
    color: var(--slate-400);
    text-decoration: none;
    transition: color 0.2s;
    font-style: normal;
    font-size: 0.9rem;
    line-height: 1.6;
}

.aeth-footer-list a:hover {
    color: white;
}

.aeth-footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    border-top: 1px solid var(--slate-800);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--slate-500);
}

.aeth-mono-date {
    font-family: var(--font-mono);
}

/* Keyframes */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Media Queries for Responsiveness */
@media (max-width: 1024px) {
    .aeth-hero-bifurcated {
        grid-template-columns: 1fr;
        min-height: auto;
    }
    
    .aeth-hero-data-pane {
        padding: 4rem 2rem;
    }
    
    .aeth-hero-visual-pane img {
        height: 50vh;
    }
    
    .aeth-intel-grid {
        grid-template-columns: 1fr;
    }
    
    .aeth-intel-fig {
        order: 2;
    }
    
    .aeth-vectors-asym-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .aeth-vector-card.aeth-span-2 {
        grid-column: span 1;
    }
    
    .aeth-vector-img-block {
        grid-column: span 2;
    }
    
    .aeth-intake-split {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .aeth-footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 2.5rem;
    }
}

@media (max-width: 768px) {
    .aeth-nav-cluster {
        display: none; /* Mobile menu logic omitted for brevity, keeping simple */
    }
    
    .aeth-vectors-asym-grid {
        grid-template-columns: 1fr;
    }
    
    .aeth-vector-img-block {
        grid-column: span 1;
    }
    
    .aeth-form-grid {
        grid-template-columns: 1fr;
    }
    
    .aeth-full-width {
        grid-column: span 1;
    }
    
    .aeth-footer-grid {
        grid-template-columns: 1fr;
    }
    
    .aeth-node-offset {
        align-self: center;
        border-right: none;
        border-left: 4px solid var(--slate-800);
    }
    
    .aeth-hero-metrics {
        flex-direction: column;
        gap: 1.5rem;
    }
}