/* ROOT VARIABLES & RESET */
:root {
    --bg-dark: #0f1115;
    --bg-card: #161b22;
    --bg-card-hover: #1c2128;
    --text-main: #e6edf3;
    --text-muted: #8b949e;

    /* Control Module Accents (Orange/Amber) */
    --accent-control: #f59e0b;
    --accent-glow: rgba(245, 158, 11, 0.15);

    --accent-screen: #3b82f6;
    --accent-audio: #10b981;
    --accent-input: #ec4899;

    --border-color: #30363d;
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

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

/* BACKGROUND */
.page-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    z-index: -1;
    background:
        radial-gradient(circle at 20% 30%, rgba(245, 158, 11, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(59, 130, 246, 0.05) 0%, transparent 30%);
}

.docs-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* NAVIGATION HEADER */
.page-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 4rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.back-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: var(--font-sans);
    font-weight: 500;
    cursor: pointer;
    transition: color 0.2s;
}

.back-btn:hover {
    color: var(--text-main);
}

.nav-breadcrumbs {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.crumb-current {
    color: var(--accent-control);
    font-weight: 600;
}

.crumb-sep {
    margin: 0 0.5rem;
    opacity: 0.5;
}

/* HERO SECTION */
.hero-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 4rem;
    margin-bottom: 5rem;
}

.hero-text h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    background: linear-gradient(to right, #fff, #fbbf24);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 500px;
    margin-bottom: 2rem;
}

.tech-stack-pills {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.pill {
    padding: 0.35rem 0.85rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.03);
}

/* VISUAL MATRIX */
.control-matrix-visual {
    position: relative;
    width: 400px;
    height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.matrix-core {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--accent-control);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    position: relative;
    box-shadow: 0 0 30px rgba(245, 158, 11, 0.1);
}

.core-label {
    font-weight: 800;
    font-size: 1.2rem;
    color: var(--text-main);
}

.matrix-node {
    position: absolute;
    padding: 0.75rem 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.matrix-node.screen {
    top: 20px;
    color: var(--accent-screen);
    border-color: rgba(59, 130, 246, 0.3);
}

.matrix-node.audio {
    bottom: 30px;
    left: 0;
    color: var(--accent-audio);
    border-color: rgba(16, 185, 129, 0.3);
}

.matrix-node.input {
    bottom: 30px;
    right: 0;
    color: var(--accent-input);
    border-color: rgba(236, 72, 153, 0.3);
}

/* SERVICE CARDS GRID */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 5rem;
}

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    transition: transform 0.2s, border-color 0.2s;
    display: flex;
    flex-direction: column;
}

.service-card:hover {
    transform: translateY(-5px);
}

.screen-card:hover {
    border-color: var(--accent-screen);
}

.audio-card:hover {
    border-color: var(--accent-audio);
}

.input-card:hover {
    border-color: var(--accent-input);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.service-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: rgba(255, 255, 255, 0.05);
}

.screen-card .service-icon {
    color: var(--accent-screen);
    background: rgba(59, 130, 246, 0.1);
}

.audio-card .service-icon {
    color: var(--accent-audio);
    background: rgba(16, 185, 129, 0.1);
}

.input-card .service-icon {
    color: var(--accent-input);
    background: rgba(236, 72, 153, 0.1);
}

.card-header h3 {
    flex-grow: 1;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
}

.status-toggle {
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-muted);
}

.service-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.feature-list {
    margin-bottom: 2rem;
    flex-grow: 1;
}

.feature-item {
    display: flex;
    gap: 0.75rem;
    font-size: 0.9rem;
    color: var(--text-main);
    margin-bottom: 0.75rem;
}

.feature-item .check {
    color: #3fb950;
    font-weight: bold;
}

.code-preview {
    background: #0d1117;
    padding: 0.75rem;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: #e6edf3;
    border: 1px solid var(--border-color);
    text-align: center;
}

/* IMPLEMENTATION SECTION */
.implementation-section {
    background: rgba(255, 255, 255, 0.02);
    border: 1px dashed var(--border-color);
    border-radius: 16px;
    padding: 3rem;
}

.section-title {
    text-align: center;
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 3rem;
    color: var(--text-main);
}

.impl-container {
    display: flex;
    gap: 3rem;
    max-width: 900px;
    margin: 0 auto;
}

.impl-sidebar {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 0.5rem;
}

.step-dot {
    width: 32px;
    height: 32px;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-muted);
    z-index: 2;
}

.step-dot.active {
    border-color: var(--accent-control);
    color: var(--accent-control);
    background: rgba(245, 158, 11, 0.1);
}

.step-line {
    width: 2px;
    height: 80px;
    background: var(--border-color);
    margin: 0.5rem 0;
}

.impl-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 4rem;
}

.impl-step h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.impl-step p {
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.code-mini {
    display: inline-block;
    background: rgba(245, 158, 11, 0.1);
    color: var(--accent-control);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

/* RESPONSIVE */
@media (max-width: 900px) {
    .hero-section {
        flex-direction: column;
        text-align: center;
    }

    .control-matrix-visual {
        width: 100%;
        height: 250px;
    }

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

    .impl-container {
        flex-direction: column;
    }

    .impl-sidebar {
        flex-direction: row;
        gap: 1rem;
        justify-content: center;
        width: 100%;
        padding-bottom: 2rem;
    }

    .step-line {
        width: 40px;
        height: 2px;
        margin: 0;
    }

    .impl-content {
        gap: 2rem;
    }
}