/* ==========================================================================
   CSS Variables & Foundations
   ========================================================================== */
:root {
    --color-brand: #508edf;
    --color-brand-dark: #3a6eb0;
    --color-brand-light: #eef4fb;
    --color-bg-base: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-bg-deep: #0f172a;
    --color-text-main: #1e293b;
    --color-text-muted: #64748b;
    --color-text-inverse: #f8fafc;
    --font-flow: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    
    --shadow-soft: 0 4px 10px rgba(0,0,0,0.03);
    --shadow-hover: 0 10px 25px rgba(80, 142, 223, 0.1);
    
    --transition-base: all 0.15s ease;
    
    --space-tunnel: max(1140px, 60vw);
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    min-width: 0;
}

body {
    font-family: var(--font-flow);
    color: var(--color-text-main);
    background-color: var(--color-bg-base);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    word-break: break-word;
    overflow-wrap: break-word;
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-base);
}

/* ==========================================================================
   Mandatory Header Styles (Inherited from Homepage Family)
   ========================================================================== */
.crest-hull {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(80, 142, 223, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.crest-tunnel {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.core {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-brand-dark);
    letter-spacing: -0.01em;
}

.core img {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.route-mesh {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1.5rem;
}

.route-beam {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-muted);
    padding: 0.5rem 0;
    position: relative;
}

.route-beam:hover {
    color: var(--color-brand);
}

.route-beam.active {
    color: var(--color-brand);
    font-weight: 600;
}

.route-beam.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--color-brand);
    border-radius: 2px;
}

@media (max-width: 768px) {
    .route-mesh {
        width: 100%;
        justify-content: flex-start;
        gap: 1rem;
        overflow-x: auto;
        padding-bottom: 0.5rem;
        -webkit-overflow-scrolling: touch;
    }
    .route-beam {
        flex-shrink: 0;
    }
}

/* ==========================================================================
   Main Content Layout & Shared Components
   ========================================================================== */
.tunnel-tunnel {
    display: flex;
    flex-direction: column;
    width: 100%;
}

.peak-xl {
    font-weight: 700;
    line-height: 1.3;
    font-size: clamp(2rem, 4vw, 3.5rem);
    letter-spacing: -0.02em;
    color: var(--color-text-inverse);
    white-space: normal;
    margin-bottom: 1.5rem;
}

.peak-lg {
    font-weight: 700;
    line-height: 1.4;
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    color: var(--color-text-main);
    letter-spacing: -0.01em;
    margin-bottom: 1rem;
    white-space: normal;
}

.peak-md {
    font-weight: 600;
    line-height: 1.4;
    font-size: 1.25rem;
    color: var(--color-text-main);
    margin-bottom: 0.75rem;
    white-space: normal;
}

/* ==========================================================================
   Section 1: Hero Intro (Inheriting Dark Cinematic Family)
   ========================================================================== */
.flare-orbit {
    width: 100%;
    min-height: 45vh;
    background: linear-gradient(135deg, var(--color-bg-deep) 0%, #1e293b 100%);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    padding: 6vw 1.5rem;
    position: relative;
    overflow: hidden;
}

.flare-orbit::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80vw;
    height: 80vw;
    background: radial-gradient(circle, rgba(80,142,223,0.15) 0%, transparent 60%);
    border-radius: 50%;
    pointer-events: none;
}

.flare-tunnel {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    z-index: 2;
}

.glyph-flare {
    width: 64px;
    height: 64px;
    margin-bottom: 2rem;
    color: var(--color-brand);
    background: rgba(80, 142, 223, 0.1);
    border-radius: 20px;
    padding: 14px;
    backdrop-filter: blur(4px);
    border: 1px solid rgba(80, 142, 223, 0.2);
}

.flow-lead {
    font-size: clamp(1.125rem, 2vw, 1.25rem);
    color: rgba(248, 250, 252, 0.85);
    line-height: 1.8;
    max-width: 800px;
    word-break: keep-all;
}

/* ==========================================================================
   Section 2: Methods (FAQ Role)
   ========================================================================== */
.portal-base {
    background-color: var(--color-bg-alt);
    padding: 6vw 1.5rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.portal-tunnel {
    width: 100%;
    max-width: var(--space-tunnel);
    display: flex;
    flex-direction: column;
}

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

.flow-sub {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
}

.cluster-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    width: 100%;
}

.shard-hull {
    background: linear-gradient(135deg, var(--color-brand-light) 0%, #ffffff 100%);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-soft);
    border: 1px solid rgba(80, 142, 223, 0.1);
    transition: var(--transition-base);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.shard-hull:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.glyph-socket {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background-color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 6px rgba(80, 142, 223, 0.15);
    color: var(--color-brand);
}

.glyph-socket svg {
    width: 24px;
    height: 24px;
}

.flow-base {
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ==========================================================================
   Article 1: Tutorial Steps
   ========================================================================== */
.nexus-cloak {
    background-color: var(--color-bg-base);
    padding: 6vw 1.5rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.nexus-tunnel {
    width: 100%;
    max-width: var(--space-tunnel);
    display: flex;
    flex-direction: column;
}

.nexus-crest {
    margin-bottom: 3rem;
}

.path-sequence {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.packet-step {
    display: flex;
    flex-wrap: wrap;
    background-color: var(--color-bg-base);
    border: 1px solid rgba(100, 116, 139, 0.15);
    border-radius: var(--radius-md);
    padding: 2rem;
    align-items: center;
    gap: 2rem;
    transition: var(--transition-base);
}

.packet-step:hover {
    border-color: rgba(80, 142, 223, 0.4);
    background-color: var(--color-bg-alt);
}

.step-band {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: var(--color-brand-light);
    color: var(--color-brand);
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: 50%;
    flex-shrink: 0;
}

.step-flow {
    flex: 1;
    min-width: 250px;
}

.step-pulse {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    background-color: var(--color-bg-deep);
    color: var(--color-text-inverse);
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9em;
    margin-right: 0.5rem;
}

/* ==========================================================================
   Article 2: Notice & Proof
   ========================================================================== */
.base-hull {
    background-color: var(--color-bg-alt);
    padding: 5vw 1.5rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    border-top: 1px solid rgba(100, 116, 139, 0.1);
}

.base-tunnel {
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
}

.cluster-flex {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 2rem;
}

.node-alert {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background-color: var(--color-bg-base);
    border-left: 4px solid var(--color-brand);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.02);
}

.node-alert.warn {
    border-left-color: #f59e0b;
}

.alert-glyph {
    color: var(--color-brand);
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.node-alert.warn .alert-glyph {
    color: #f59e0b;
}

/* ==========================================================================
   Footer Section
   ========================================================================== */
.tail-socket {
    background-color: var(--color-bg-deep);
    color: var(--color-text-muted);
    padding: 4rem 1.5rem 2rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.tail-tunnel {
    width: 100%;
    max-width: var(--space-tunnel);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
}

.tail-core {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-inverse);
    letter-spacing: -0.01em;
}

.tail-flow {
    font-size: 0.875rem;
}

.tail-mesh {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    justify-content: center;
    margin-top: 1rem;
}

.tail-beam {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.tail-beam:hover {
    color: var(--color-text-inverse);
}

/* ==========================================================================
   Responsive Utilities
   ========================================================================== */
@media (max-width: 768px) {
    .packet-step {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    .cluster-grid {
        grid-template-columns: 1fr;
    }
}

.route-crest-hull{
            position: sticky;
            top: 0;
            z-index: 100;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
        }

.route-crest-hull .route-crest-tunnel{
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 1.25rem 5vw;
            max-width: 1280px;
            margin: 0 auto;
        }

.route-crest-hull .route-crest-tunnel > *{
            min-width: 0;
        }

.route-crest-hull .route-core{
            display: flex;
            align-items: center;
            gap: 0.75rem;
            font-weight: 700;
            font-size: 1.5rem;
            color: #1e293b;
            letter-spacing: -0.02em;
        }

.route-crest-hull .route-core img{
            height: 32px;
            width: auto;
            display: block;
        }

.route-crest-hull .route-route-mesh{
            display: flex;
            flex-wrap: wrap;
            gap: 2rem;
            align-items: center;
        }

.route-crest-hull .route-route-mesh > *{
            min-width: 0;
        }

.route-crest-hull .route-route-beam{
            font-size: 1rem;
            font-weight: 500;
            color: #64748b;
            position: relative;
            padding: 0.5rem 0;
        }

.route-crest-hull .route-route-beam:hover, .route-crest-hull .route-route-beam:focus{
            color: #508edf;
        }

.route-crest-hull .route-route-beam.active{
            color: #508edf;
        }

.route-crest-hull .route-route-beam.active::after{
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: #508edf;
            border-radius: 2px;
        }

@media (max-width: 768px){.route-crest-hull .route-route-mesh{
                gap: 1rem;
                margin-top: 1rem;
                width: 100%;
                justify-content: center;
            }}

.route-crest-hull {
    background: rgb(255, 255, 255);
    background-image: none;
}

.socket-tail-socket {
    font-family: var(--font-flow);
    line-height: 1.7;
    color: var(--color-text-main);
}
.socket-tail-socket,
.socket-tail-socket *,
.socket-tail-socket *::before,
.socket-tail-socket *::after {
    box-sizing: border-box;
}

.socket-tail-socket nav,
.socket-tail-socket div,
.socket-tail-socket section,
.socket-tail-socket article,
.socket-tail-socket aside,
.socket-tail-socket p,
.socket-tail-socket h1,
.socket-tail-socket h2,
.socket-tail-socket h3,
.socket-tail-socket h4,
.socket-tail-socket h5,
.socket-tail-socket h6,
.socket-tail-socket a {
    margin: 0;
    padding: 0;
    font: inherit;
    color: inherit;
    letter-spacing: inherit;
    line-height: inherit;
}

.socket-tail-socket p,
.socket-tail-socket h1,
.socket-tail-socket h2,
.socket-tail-socket h3,
.socket-tail-socket h4,
.socket-tail-socket h5,
.socket-tail-socket h6 {
    text-decoration: none;
}

.socket-tail-socket img {
    display: block;
    max-width: 100%;
    height: auto;
    border: 0;
}

.socket-tail-socket {
    box-shadow: none;
    filter: none;
    text-shadow: none;
    background-image: none;
    border-top: none;
    border-left: none;
    border-right: none;
    outline: none;
}

.socket-tail-socket a,
.socket-tail-socket a:hover,
.socket-tail-socket a:focus,
.socket-tail-socket a:active {
    background: transparent;
    box-shadow: none;
    outline: none;
    text-decoration: none;
}

.socket-tail-socket .socket-bound-cloak{
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 5vw;
        }

.socket-tail-socket{
            background-color: #0f172a;
            color: rgba(255,255,255,0.7);
            padding: 4rem 0 2rem 0;
            border-top: 1px solid rgba(255,255,255,0.1);
        }

.socket-tail-socket .socket-tail-tunnel{
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: flex-start;
            gap: 3rem;
            margin-bottom: 4rem;
        }

.socket-tail-socket .socket-tail-tunnel > *{ min-width: 0; }

.socket-tail-socket .socket-tail-brand{
            font-size: 1.75rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: -0.02em;
            margin-bottom: 1rem;
            display: block;
        }

.socket-tail-socket .socket-tail-flow{
            max-width: 300px;
            font-size: 0.95rem;
        }

.socket-tail-socket .socket-tail-mesh{
            display: flex;
            flex-wrap: wrap;
            gap: 4rem;
        }

.socket-tail-socket .socket-tail-mesh > *{ min-width: 0; }

.socket-tail-socket .socket-tail-cluster{
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

.socket-tail-socket .socket-tail-peak{
            color: #fff;
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }

.socket-tail-socket .socket-tail-beam{
            color: rgba(255,255,255,0.6);
            font-size: 0.95rem;
        }

.socket-tail-socket .socket-tail-beam:hover{
            color: #fff;
        }

.socket-tail-socket .socket-tail-base-line{
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.875rem;
        }