/* --- SCOPED VARIABLES & FONTS --- */
.hw-a-section {
    position: relative; 
    padding: 10rem 0; 
    background: var(--bg);
    overflow: hidden; 
    color: var(--text); 
    perspective: 2500px;
    font-family: var(--font-sans);
}

.mono-font { font-family: 'JetBrains Mono', var(--font-mono); letter-spacing: -0.05em; }

/* --- ADVANCED ATMOSPHERE --- */
.hw-a-bg-ambient {
    position: absolute;  width: 100%; height: 100%;
    background: radial-gradient(circle at center, var(--brand-glow) 0%, transparent 50%);
    opacity: 0.1; pointer-events: none;
}

/* Caustics: Fake refracted light on the floor */
.hw-a-floor-caustics {
    position: absolute; bottom: -5%; left: 0%; width: 100%; height: 60%;
    background: repeating-linear-gradient(45deg, transparent, transparent 10px, var(--brand-glow) 10px, var(--brand-glow) 20px);
    filter: blur(30px); opacity: 0.2; transform: rotateX(70deg);
    mask-image: radial-gradient(ellipse at center, black 40%, transparent 80%);
}

.hw-a-grid-floor {
    position: absolute; bottom: -25%; left: -50%; width: 200%; height: 100%;
    /* Uses text color for grid lines so it works in light mode too */
    background-image: linear-gradient(color-mix(in srgb, var(--text) 5%, transparent) 1px, transparent 1px),
                      linear-gradient(90deg, color-mix(in srgb, var(--text) 5%, transparent) 1px, transparent 1px);
    background-size: 80px 80px; transform: rotateX(70deg);
    mask-image: linear-gradient(to bottom, transparent 10%, black 50%, transparent 90%);
    opacity: 0.9;
}

/* --- LAYOUT & HEADER --- */
.hw-a-container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; position: relative; z-index: 2; }

.hw-a-header { text-align: center; max-width: 660px; margin: 0 auto 6rem; }






/* --- TECH READOUT: Apple-Style System Pill --- */

.hw-a-tech-readout {
    /* Layout & Shape */
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 6px 14px 6px 8px; /* Tighter left padding for the dot */
    border-radius: 100px; /* Full pill shape */
    
    /* Glass Material */
    background: color-mix(in srgb, var(--elev-2) 60%, var(--bg));
    border: 1px solid color-mix(in srgb, var(--text) 15%, transparent);
    box-shadow: 
        0 4px 20px -5px rgba(0, 0, 0, 0.4), /* Deep shadow for lift */
        inset 0 1px 0 var(--glass-highlight); /* Top highlight */
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    
    /* Interaction */
    transition: all 0.3s var(--ease-out-expo);
    cursor: default;
    user-select: none;
    margin-bottom: 2rem; /* Spacing from title */
}

/* Hover State: "Active" look */
.hw-a-tech-readout:hover {
    border-color: var(--brand-glow);
    background: color-mix(in srgb, var(--elev-2) 80%, var(--bg));
    transform: translateY(-1px);
    box-shadow: 
        0 8px 30px -10px rgba(0, 0, 0, 0.5),
        0 0 15px var(--brand-glow); /* Subtle accent glow */
}

/* --- 1. STATUS BEACON (The Dot) --- */
.status-beacon {
    position: relative;
    width: 16px; height: 16px;
    display: flex; align-items: center; justify-content: center;
}

.beacon-core {
    width: 6px; height: 6px;
    background: var(--ok); /* Success Green (Universal "Nominal" color) */
    border-radius: 50%;
    z-index: 2;
    box-shadow: 0 0 8px var(--ok);
}

.beacon-ping {
    position: absolute;
    width: 100%; height: 100%;
    background: var(--ok);
    border-radius: 50%;
    opacity: 0;
    z-index: 1;
    animation: beaconPulse 2s cubic-bezier(0, 0, 0.2, 1) infinite;
}

/* --- 2. TEXT ELEMENTS --- */
.readout-text {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text);
    letter-spacing: 0.01em;
}

.readout-divider {
    width: 1px;
    height: 12px;
    background: color-mix(in srgb, var(--text) 15%, transparent);
    opacity: 0.5;
}

/* --- 3. METRIC DATA --- */
.readout-metric {
    display: flex;
    align-items: baseline;
    gap: 6px;
}

.metric-label {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.metric-val {
    font-size: 0.8rem;
    color: var(--brand);
    font-weight: 600;
    /* Uses the mono-font class from parent section for numbers */
}

/* --- ANIMATION --- */
@keyframes beaconPulse {
    0% { transform: scale(0.5); opacity: 0.8; }
    70% { transform: scale(1.5); opacity: 0; }
    100% { transform: scale(1.5); opacity: 0; }
}






.separator { opacity: 0.3; }

.hw-a-header h2 { font-size: clamp(3rem, 6vw, 4.5rem); line-height: 1; font-weight: 800; letter-spacing: -0.03em; margin-bottom: 1.5rem; }
.hw-a-text-gradient { background: linear-gradient(135deg, var(--text) 30%, var(--brand)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hw-a-header p { font-size: 1.25rem; color: var(--text-muted); max-width: 500px; margin: auto; }

/* --- 3D STAGE --- */
.hw-a-stage-wrapper { display: grid; grid-template-columns: 1.5fr 1fr; gap: 5rem; align-items: center; }
.hw-a-visualizer { height: 600px; display: flex; align-items: center; justify-content: center; position: relative; }

/* The High-Fidelity Stack Container */
.hw-a-stack-container {
    position: relative; width: 340px; height: 340px;
    transform-style: preserve-3d;
    /* Initial isometric view */
    transform: rotateX(55deg) rotateZ(-45deg);
    transition: transform 0.1s ease-out; /* Fast for parallax */
}

/* --- THE "THICK GLASS" PLATES --- */
.hw-a-plate {
    position: absolute; inset: 0;
    transform-style: preserve-3d;
    transition: transform 1s var(--ease-out-expo);
}
/* Base Z-positions */
.hw-a-plate.plate-btm { transform: translateZ(0px); }
.hw-a-plate.plate-mid { transform: translateZ(50px); }
.hw-a-plate.plate-top { transform: translateZ(100px); }

/* The "Surface" - Top of the glass */
.plate-surface {
    position: absolute; inset: 0;
    background: color-mix(in srgb, var(--elev-2) 60%, transparent);
    border-radius: 24px;
    /* The "Thick Edge" Hack: Multiple shadows */
    box-shadow: 
        inset 0 1px 1px color-mix(in srgb, var(--text) 15%, transparent), /* Top edge highlight */
        inset 0 0 20px color-mix(in srgb, var(--brand) 5%, transparent), /* subtle inner color */
        0 4px 10px rgba(0,0,0,0.2); /* Drop shadow beneath */
    backdrop-filter: blur(8px);
    border: 1px solid var(--stroke);
    overflow: hidden;
    backface-visibility: hidden;
}

/* Active State Glow */
.hw-a-plate.active .plate-surface {
    border-color: var(--brand-glow);
    box-shadow: 
        inset 0 1px 1px color-mix(in srgb, var(--text) 15%, transparent),
        inset 0 0 30px var(--brand-glow),
        0 0 40px var(--brand-glow),
        0 10px 20px rgba(0,0,0,0.3);
    background: color-mix(in srgb, var(--brand) 8%, color-mix(in srgb, var(--elev-2) 70%, transparent));
}

/* The Label floating off the side */
.plate-label {
    position: absolute; right: -100px; top: 50%;
    transform: translateY(-50%) rotateX(-90deg) rotateY(45deg);
    font-size: 0.7rem; color: var(--text-muted);
    pointer-events: none; opacity: 0; transition: 0.5s ease;
}
.hw-a-plate.active .plate-label { opacity: 1; color: var(--brand); transform: translateY(-50%) rotateX(-90deg) rotateY(45deg) translateX(20px); }

/* --- PLATE CONTENTS & MICRO-ANIMATIONS --- */
.plate-content { position: absolute; inset: 0; perspective: 500px; }

/* Circuitry */
.circuit-svg { position: absolute; inset: 10%; width: 80%; height: 80%; color: var(--text-muted); opacity: 0.4; transition: 0.5s; }
.active .circuit-svg { color: var(--brand); opacity: 1; filter: drop-shadow(0 0 5px var(--brand)); }

/* Blinking LEDs */
.blink-led { width: 4px; height: 4px; background: var(--brand); border-radius: 50%; position: absolute; box-shadow: 0 0 10px var(--brand); animation: blink 2s infinite; }
.blink-led.fast { animation-duration: 0.8s; }

/* Data Packets Animating along paths */
.data-packet { opacity: 0; }
.active .p1 { animation: movePath 3s linear infinite; animation-path: path('M50 50 L85 15'); }
.active .p2 { animation: movePath 3s linear infinite 1s; animation-path: path('M50 50 L15 15'); }
.active .p3 { animation: movePath 3s linear infinite 2s; animation-path: path('M50 50 L50 95'); }

/* Core Processor */
.chip-assembly {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%) translateZ(5px);
    width: 80px; height: 80px; 
    background: var(--elev-1); 
    border: 1px solid var(--stroke);
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2); transition: 0.5s;
}
.active .chip-assembly { border-color: var(--brand); box-shadow: 0 0 20px var(--brand-glow); }
.main-processor { position: relative; z-index: 2; text-align: center; }
.chip-text { font-size: 0.5rem; color: var(--text); opacity: 0.6; display: block; line-height: 1.2; }
.processor-glow {
    position: absolute; top: 50%; left: 50%; width: 10px; height: 10px;
    background: var(--brand); border-radius: 50%; transform: translate(-50%, -50%);
    filter: blur(10px); opacity: 0; transition: 0.5s;
}
.active .processor-glow { opacity: 0.8; animation: pulse 2s infinite; }

/* Battery Cells */
.power-matrix { display: flex; gap: 10px; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); }
.bat-cell { 
    width: 40px; height: 70px; 
    background: var(--elev-1); 
    border: 1px solid var(--stroke); 
    position: relative; overflow: hidden; 
}
.energy-bar { position: absolute; bottom: 0; left: 0; width: 100%; height: 0%; background: var(--brand); opacity: 0.5; transition: 1s; }
.active .energy-bar { height: 80%; animation: chargeUp 4s ease-out infinite alternate; }
.power-connector { display: flex; align-items: center; color: var(--stroke-2); transition: 0.5s; }
.active .power-connector { color: var(--brand); filter: drop-shadow(0 0 5px var(--brand)); }


/* --- UI CONTROLS --- */
/* --- UI CONTROLS: Apple-Pro / Industrial Aesthetics --- */

.hw-a-controls {
    position: relative; 
    /* Glassmorphism surface using global elev-2 */
    background: color-mix(in srgb, var(--elev-2) 60%, transparent);
    padding: 3rem 2rem; 
    border-radius: 32px;
    /* Subtle border using global stroke */
    border: 1px solid var(--stroke);
    box-shadow: 
        0 20px 40px -10px rgba(0,0,0,0.3),
        inset 0 1px 0 var(--glass-highlight);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

/* Decorative "Screws" - Industrial detail */
.ui-screw { 
    position: absolute; width: 10px; height: 10px; border-radius: 50%; 
    border: 1px solid var(--stroke-2); background: var(--elev-1); 
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.5);
    z-index: 5;
}
.ui-screw::after { 
    content: '+'; position: absolute; inset: 0; 
    display: flex; align-items: center; justify-content: center; 
    font-size: 10px; color: var(--text-dim); transform: rotate(45deg); 
}
.tl { top: 16px; left: 16px; } .tr { top: 16px; right: 16px; }
.bl { bottom: 16px; left: 16px; } .br { bottom: 16px; right: 16px; }

/* --- SELECTOR LIST --- */
.hw-a-selector-list {
    display: flex;
    flex-direction: column;
    gap: 0; /* Gap handled by padding for timeline continuity */
}

/* --- THE ITEM --- */
.hw-a-item {
    background: transparent; 
    border: none; 
    text-align: left;
    position: relative; 
    cursor: pointer; 
    color: var(--text-muted);
    transition: all 0.4s var(--ease-out-expo);
    display: grid; 
    grid-template-columns: 48px 1fr; /* Timeline column + Content */
    gap: 1.5rem; 
    padding: 0 0 2rem 0; /* Bottom padding for timeline spacing */
    outline: none;
}

/* --- TIMELINE COLUMN --- */
.item-timeline {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* The Line */
.timeline-line {
    position: absolute;
    top: 24px; bottom: -100%; /* Extend to next item */
    width: 2px;
    background: var(--stroke);
    transition: background 0.4s ease;
    z-index: 0;
}
/* Hide line for last item to prevent dangling */
.hw-a-item:last-child .timeline-line { display: none; }

/* The Knob/Dot */
.timeline-knob {
    width: 16px; height: 16px;
    border-radius: 50%;
    background: var(--elev-1);
    border: 2px solid var(--stroke-2);
    z-index: 1;
    transition: all 0.4s var(--ease-out-expo);
    box-shadow: 0 0 0 4px var(--bg); /* Fake margin for clean line cut */
    margin-top: 4px; /* Align with text */
}

/* --- ITEM BODY --- */
.item-body {
    position: relative;
    padding: 1rem 1.5rem;
    border-radius: 16px;
    border: 1px solid transparent;
    transition: all 0.4s ease;
}

.item-header { 
    display: flex; 
    align-items: center; 
    gap: 1rem; 
}

.item-header .idx { 
    font-size: 0.75rem; 
    color: var(--brand); 
    opacity: 0.5; 
    font-weight: 700;
    transition: opacity 0.3s;
}

.item-header h4 { 
    margin: 0; 
    font-size: 1.1rem; 
    font-weight: 600; 
    color: currentColor;
    transition: transform 0.3s ease;
}

/* Accordion Description */
.item-content-wrapper {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.5s var(--ease-out-expo);
}

.item-desc { 
    margin: 0; 
    font-size: 0.9rem; 
    line-height: 1.6; 
    color: var(--text-muted); 
    overflow: hidden; 
    opacity: 0;
    transform: translateY(-5px);
    transition: opacity 0.4s ease, transform 0.4s ease;
    padding-top: 0;
}

/* --- HOVER STATE --- */
.hw-a-item:hover .timeline-knob {
    border-color: var(--brand);
    background: color-mix(in srgb, var(--brand) 10%, var(--elev-1));
}
.hw-a-item:hover .item-header h4 {
    color: var(--text);
    transform: translateX(4px);
}

/* --- ACTIVE STATE --- */
.hw-a-item.active {
    color: var(--text);
}

/* Active Timeline */
.hw-a-item.active .timeline-knob {
    background: var(--brand);
    border-color: var(--brand);
    box-shadow: 0 0 0 4px var(--bg), 0 0 15px var(--brand);
    transform: scale(1.2);
}
.hw-a-item.active .timeline-line {
    background: linear-gradient(to bottom, var(--brand) 0%, var(--stroke) 100%);
}

/* Active Card Body */
.hw-a-item.active .item-body {
    background: color-mix(in srgb, var(--elev-1) 40%, transparent);
    border-color: color-mix(in srgb, var(--brand) 20%, transparent);
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.hw-a-item.active .idx { opacity: 1; }

.hw-a-item.active .item-content-wrapper {
    grid-template-rows: 1fr;
}

.hw-a-item.active .item-desc {
    opacity: 1;
    transform: translateY(0);
    padding-top: 0.75rem; /* Add breathing room when open */
}

/* Specs Footer */
.hw-a-specs-footer {
    margin-top: 1rem; 
    padding-top: 2rem; 
    border-top: 1px solid var(--stroke);
    display: flex; 
    justify-content: space-around; 
    position: relative;
    opacity: 0.8;
}
.spec-block { display: flex; flex-direction: column; gap: 6px; align-items: center; }
.spec-block .lbl { font-size: 0.7rem; color: var(--text-dim); letter-spacing: 0.05em; }
.spec-block .val { font-size: 0.95rem; color: var(--brand); font-weight: 600; }
.spec-divider { width: 1px; height: 30px; background: var(--stroke); }

/* Mobile Adjustment */
@media (max-width: 600px) {
    .hw-a-item {
        grid-template-columns: 32px 1fr;
        gap: 1rem;
    }
    .timeline-knob { width: 12px; height: 12px; }
    .timeline-line { left: 5px; width: 2px; } /* Center line to knob width */
    .hw-a-controls { padding: 2rem 1.5rem; }
}










/* Specs Footer */
.hw-a-specs-footer {
    margin-top: 3rem; padding-top: 2rem; border-top: 1px solid color-mix(in srgb, var(--stroke) 50%, transparent);
    display: flex; justify-content: space-around; position: relative;
}
.spec-block { display: flex; flex-direction: column; gap: 6px; align-items: center; }
.spec-block .lbl { font-size: 0.7rem; color: var(--text-dim); }
.spec-block .val { font-size: 1rem; color: var(--brand); }
.spec-divider { width: 1px; height: 40px; background: color-mix(in srgb, var(--stroke) 50%, transparent); }

/* --- KEYFRAMES --- */
@keyframes blink { 0%, 100% { opacity: 0.3; } 50% { opacity: 1; box-shadow: 0 0 15px var(--brand); } }
@keyframes pulse { 0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.5; } 50% { transform: translate(-50%, -50%) scale(1.2); opacity: 1; } }
@keyframes chargeUp { 0% { height: 70%; } 100% { height: 95%; filter: brightness(1.2); } }

/* --- MOBILE --- */
@media (max-width: 1024px) {
    .hw-a-stage-wrapper { grid-template-columns: 1fr; gap: 3rem; }
    .hw-a-visualizer { height: 450px; order: -1; }
    .hw-a-floor-caustics {
        position: absolute; bottom: 20%; left: 0%; width: 100%; height: 60%;
        background: repeating-linear-gradient(45deg, transparent, transparent 10px, var(--brand-glow) 10px, var(--brand-glow) 20px);
}
}