/* — Reset & Variables — */
:root {
    --bg: #f8fafc;            /* Crisp light slate/ice background */
    --panel: #ffffff;         /* Pure white clinical panel card */
    --panel-2: #f1f5f9;       /* Secondary card background */
    --border: #e2e8f0;        /* Soft silver-lavender border */
    --border-hover: #cbd5e1;  /* Hover border color */
    --text: #0f172a;          /* Rich ink navy text for contrast */
    --muted: #64748b;         /* Slate gray for secondary text */
    
    /* Cool High-Tech Telemetry Gradients */
    --accent-1: #0ea5e9;      /* Electric Cyan */
    --accent-2: #6366f1;      /* Tactile Indigo */
    --gradient: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    
    --ok: #10b981;            /* Medical Emerald Green */
    --err: #ef4444;           /* Critical Alert Ruby */
    --warn: #f59e0b;          /* Resonance Warning Gold */
    --mono: "JetBrains Mono", ui-monospace, monospace;
    --sans: "Outfit", -apple-system, system-ui, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    line-height: 1.6;
    overflow-x: hidden;
}

/* — Custom Scrollbars — */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg);
}
::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover);
}

/* — Page Container — */
.page-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* — Hero Section — */
.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 80px 20px 60px;
    position: relative;
}

.hero-content {
    max-width: 800px;
    margin-bottom: 40px;
}

.badge {
    display: inline-block;
    background: rgba(14, 165, 233, 0.08);
    border: 1px solid rgba(14, 165, 233, 0.25);
    color: var(--accent-1);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 20px;
}

.hero h1 {
    font-size: 52px;
    font-weight: 850;
    letter-spacing: -1px;
    line-height: 1.1;
    margin-bottom: 20px;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 4px 12px rgba(99, 102, 241, 0.06);
}

.hero .subtitle {
    font-size: 18px;
    color: var(--muted);
    font-weight: 400;
    margin-bottom: 30px;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
}

/* — Buttons — */
.btn {
    background: var(--panel);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn:hover {
    border-color: var(--accent-1);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.1);
}

.btn.primary {
    background: var(--gradient);
    border-color: transparent;
    color: #fff;
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.15);
}

.btn.primary:hover {
    filter: brightness(1.05);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.25);
}

.btn.secondary {
    background: rgba(15, 23, 42, 0.03);
    border-color: rgba(15, 23, 42, 0.08);
}

.btn.secondary:hover {
    background: rgba(15, 23, 42, 0.06);
    border-color: var(--muted);
}

.btn.danger {
    background: rgba(239, 68, 68, 0.05);
    border-color: rgba(239, 68, 68, 0.15);
    color: var(--err);
}

.btn.danger:hover {
    background: var(--err);
    color: white;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.15);
}

/* — Hero Graphic — */
.hero-graphic {
    width: 100%;
    max-width: 900px;
    position: relative;
    padding: 20px;
}

.actuator-glow {
    position: absolute;
    top: 50%;
    left: 5%;
    right: 5%;
    height: 30px;
    transform: translateY(-50%);
    background: linear-gradient(90deg, rgba(14,165,233,0.15), rgba(99,102,241,0.25), rgba(14,165,233,0.15));
    filter: blur(20px);
    opacity: 0.8;
    pointer-events: none;
    border-radius: 20px;
}

.actuator-preview {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 15px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
    display: flex;
    align-items: center;
}

.actuator-preview canvas {
    width: 100%;
    height: 80px;
    border-radius: 6px;
    image-rendering: auto;
}

/* — Top Row: Summary & Simulator — */
.summary-sim-row {
    display: flex;
    gap: 40px;
    margin-top: 40px;
    align-items: stretch;
}

.summary-column {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.summary-column .doc-card {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.simulator-column {
    width: 500px;
    flex-shrink: 0;
}

@media (max-width: 1100px) {
    .summary-sim-row {
        flex-direction: column;
        align-items: stretch;
    }
    .simulator-column {
        width: 100%;
    }
}

/* — Technical Document Card — */
.doc-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 35px;
    box-shadow: 0 4px 20px rgba(15, 23, 42, 0.02);
    margin-bottom: 30px;
}

.doc-card h2 {
    font-size: 24px;
    font-weight: 750;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
    color: var(--text);
    border-left: 4px solid var(--accent-1);
    padding-left: 12px;
}

.doc-card p {
    color: var(--muted);
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 20px;
}

.doc-card strong {
    color: var(--text);
}

/* — Tech Table — */
.tech-table-wrapper {
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    margin-top: 25px;
}

.tech-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    text-align: left;
}

.tech-table th, .tech-table td {
    padding: 14px 18px;
    border-bottom: 1px solid var(--border);
}

.tech-table th {
    background: var(--panel-2);
    color: var(--text);
    font-weight: 600;
}

.tech-table tr:last-child td {
    border-bottom: none;
}

.tech-table td strong {
    font-weight: 600;
}

/* — Live Portal Simulator Chassis — */
.simulator-sticky {
    position: sticky;
    top: 20px;
}

.sim-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.sim-title {
    display: flex;
    align-items: center;
    gap: 8px;
}

.sim-title h2 {
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.dot.live {
    background: var(--ok);
}

.dot.blinking {
    animation: blink 1s infinite alternate;
}

@keyframes blink {
    from { opacity: 0.3; }
    to { opacity: 1; }
}

.virtual-actuator-chassis {
    background: #0d131f; /* Keep dark cockpit for virtual telemetry screen */
    border: 1px solid #1e293b;
    border-radius: 16px;
    padding: 18px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
    margin-bottom: 25px;
    color: #94a3b8;
}

.virtual-actuator-chassis .strip-header {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    margin-bottom: 12px;
    color: #e2e8f0;
}

.telemetry-viewport {
    height: 180px;
    display: flex;
    align-items: center;
    border-radius: 8px;
    background: #090d16;
    padding: 5px;
}

.telemetry-viewport canvas {
    width: 100%;
    height: 100%;
}

.virtual-actuator-chassis .strip-footer {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    margin-top: 10px;
    border-top: 1px solid #1e293b;
    padding-top: 8px;
}

.virtual-actuator-chassis .strip-footer b {
    color: #f8fafc;
}

/* — Captive Portal Container — */
.portal-container {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: 0 8px 30px rgba(15, 23, 42, 0.03);
    overflow: hidden;
}

.portal-header {
    background: var(--panel-2);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
}

.portal-logo {
    font-size: 15px;
    font-weight: 850;
    letter-spacing: 1px;
    color: var(--text);
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.portal-crumb {
    font-size: 12px;
    color: var(--muted);
}

.portal-crumb b {
    color: var(--text);
}

.portal-status {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    font-weight: 600;
    color: var(--muted);
}

.portal-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--ok);
}

.portal-body {
    padding: 24px;
}

/* — Portal Tabs — */
.tabbar {
    display: flex;
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 4px;
    margin-bottom: 24px;
}

.tab {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--muted);
    font-family: var(--sans);
    font-size: 13px;
    font-weight: 600;
    padding: 8px;
    border-radius: 7px;
    cursor: pointer;
    transition: all 0.15s ease;
}

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

.tab.active {
    background: var(--panel);
    color: var(--text);
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.05);
}

.tab-content h3 {
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--muted);
}

/* — Controls and Form Rows — */
.row {
    display: flex;
    align-items: center;
    margin-bottom: 18px;
    font-size: 13px;
}

.row label {
    width: 140px;
    color: var(--text);
    font-weight: 500;
}

.row select {
    flex: 1;
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 12px;
    color: var(--text);
    font-family: var(--sans);
    outline: none;
}

.row input[type="range"] {
    flex: 1;
    height: 5px;
    background: var(--border);
    border-radius: 5px;
    outline: none;
    -webkit-appearance: none;
}

.row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-1);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(14, 165, 233, 0.3);
    transition: transform 0.1s ease;
}

.row input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.row .val {
    width: 50px;
    text-align: right;
    font-family: var(--mono);
    font-weight: 500;
    color: var(--text);
}

.control-actions {
    display: flex;
    gap: 12px;
    margin-top: 25px;
}

.control-actions button {
    flex: 1;
}

/* — Library Cards — */
.tag-chips {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.chip {
    font-size: 11px;
    font-weight: 600;
    padding: 5px 12px;
    border-radius: 15px;
    background: var(--panel-2);
    border: 1px solid var(--border);
    color: var(--muted);
    cursor: pointer;
    transition: all 0.15s ease;
}

.chip:hover, .chip.active {
    background: rgba(14, 165, 233, 0.08);
    border-color: var(--accent-1);
    color: var(--accent-1);
}

.cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    max-height: 280px;
    overflow-y: auto;
    padding-right: 4px;
}

.card-item {
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px;
    cursor: pointer;
    transition: all 0.15s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card-item:hover, .card-item.active {
    background: #ffffff;
    border-color: var(--accent-1);
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.06);
}

.card-item h4 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
}

.card-item p {
    font-size: 11px;
    color: var(--muted);
    line-height: 1.4;
}

/* — Audio Spectrum Visualizer — */
.spectrum-visualizer {
    background: #090d16;
    border-radius: 10px;
    padding: 10px;
    margin-top: 15px;
    margin-bottom: 12px;
    border: 1px solid #1e293b;
}

.spectrum-visualizer canvas {
    width: 100%;
    height: 80px;
    display: block;
}

.hint {
    font-size: 11px;
    color: var(--muted);
    line-height: 1.5;
}

/* — Diagnostics Panel — */
.diag-specs {
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 15px;
    margin-top: 10px;
}

.diag-line {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    font-family: var(--sans);
    margin-bottom: 8px;
}

.diag-line:last-child {
    margin-bottom: 0;
}

.diag-line span:first-child {
    color: var(--muted);
}

.diag-line span:last-child {
    font-family: var(--mono);
    color: var(--text);
    font-weight: 500;
}

/* — bottom docs section — */
.bottom-docs-column {
    display: flex;
    flex-direction: column;
    gap: 30px;
    margin-top: 40px;
}

.spec-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 25px;
}

.spec-item h3 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text);
}

.spec-item p {
    font-size: 13.5px;
    color: var(--muted);
    line-height: 1.6;
}

@media (max-width: 768px) {
    .spec-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* — Footer — */
.main-footer {
    text-align: center;
    padding: 50px 20px 20px;
    border-top: 1px solid var(--border);
    margin-top: 60px;
}

.main-footer p {
    font-size: 12px;
    color: var(--muted);
}