/* ===================================================
   gabs.quest — Muted Circuit Board Editorial
   Colors: #1B2A3C #2A3B4D #3D4F5F #5B8FA8 #6B8F71
           #B87A56 #A8B4C0 #D5DAE0 #E8ECF0
   Fonts: Archivo Black, Space Grotesk, Source Sans 3, IBM Plex Mono
   =================================================== */

/* --- CSS Custom Properties --- */
:root {
    --deep-substrate: #1B2A3C;
    --mid-substrate: #3D4F5F;
    --trace-blue: #5B8FA8;
    --signal-green: #6B8F71;
    --copper-accent: #B87A56;
    --light-ground: #E8ECF0;
    --paper-tone: #D5DAE0;
    --solder-silver: #A8B4C0;
    --dark-trace: #2A3B4D;

    --font-display: 'Archivo Black', sans-serif;
    --font-secondary: 'Space Grotesk', sans-serif;
    --font-body: 'Source Sans 3', sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;
}

/* --- Reset and Base --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    color: var(--mid-substrate);
    background: var(--deep-substrate);
    overflow: hidden;
}

/* --- Scroll Container with Snap --- */
#scroll-container {
    height: 100vh;
    overflow-y: auto;
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
}

/* --- Section Spreads --- */
.spread {
    height: 100vh;
    scroll-snap-align: start;
    position: relative;
    overflow: hidden;
}

.spread-dark {
    background-color: var(--deep-substrate);
    color: var(--light-ground);
}

.spread-light {
    background-color: var(--light-ground);
    color: var(--mid-substrate);
}

/* --- Subtle Background Footprint Pattern --- */
.spread-dark::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 30%, var(--dark-trace) 1px, transparent 1px),
        radial-gradient(circle at 60% 70%, var(--dark-trace) 1px, transparent 1px),
        radial-gradient(circle at 80% 20%, var(--dark-trace) 0.5px, transparent 0.5px),
        radial-gradient(circle at 40% 80%, var(--dark-trace) 0.5px, transparent 0.5px);
    background-size: 120px 120px, 150px 150px, 80px 80px, 100px 100px;
    opacity: 0.15;
    pointer-events: none;
}

.spread-light::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 30%, var(--solder-silver) 1px, transparent 1px),
        radial-gradient(circle at 60% 70%, var(--solder-silver) 1px, transparent 1px),
        radial-gradient(circle at 80% 20%, var(--paper-tone) 0.5px, transparent 0.5px);
    background-size: 120px 120px, 150px 150px, 80px 80px;
    opacity: 0.2;
    pointer-events: none;
}

/* --- Z-Pattern Grid --- */
.z-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    grid-template-rows: repeat(10, 1fr);
    grid-template-areas:
        "headline headline headline headline headline . visual visual visual visual visual visual"
        "headline headline headline headline headline . visual visual visual visual visual visual"
        "headline headline headline headline headline . visual visual visual visual visual visual"
        ". . bridge bridge bridge bridge bridge bridge bridge . . ."
        ". . bridge bridge bridge bridge bridge bridge bridge . . ."
        ". . bridge bridge bridge bridge bridge bridge bridge . . ."
        "body body body body body body . . exit exit exit exit"
        "body body body body body body . . exit exit exit exit"
        "body body body body body body . . exit exit exit exit"
        "body body body body body body . . exit exit exit exit";
    height: calc(100vh - 60px);
    padding: 5vh 5vw 0;
    position: relative;
    z-index: 1;
    gap: 0;
}

.z-headline {
    grid-area: headline;
    display: flex;
    align-items: flex-start;
    padding-top: 2vh;
}

.z-visual {
    grid-area: visual;
    display: flex;
    align-items: center;
    justify-content: center;
}

.z-bridge {
    grid-area: bridge;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding-left: 2vw;
    position: relative;
}

.z-bridge::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--trace-blue) 10%, var(--trace-blue) 90%, transparent);
    opacity: 0.25;
    transform: translateY(-50%);
}

.z-body {
    grid-area: body;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    padding-top: 1vh;
    gap: 1rem;
}

.z-exit {
    grid-area: exit;
    display: flex;
    align-items: flex-end;
    justify-content: flex-end;
    padding-bottom: 2vh;
    padding-right: 2vw;
}

/* --- Inverted Z-Pattern (Closing Section) --- */
.z-grid-inverted {
    grid-template-areas:
        "visual visual visual visual visual visual . headline headline headline headline headline"
        "visual visual visual visual visual visual . headline headline headline headline headline"
        "visual visual visual visual visual visual . headline headline headline headline headline"
        ". . bridge bridge bridge bridge bridge bridge bridge . . ."
        ". . bridge bridge bridge bridge bridge bridge bridge . . ."
        ". . bridge bridge bridge bridge bridge bridge bridge . . ."
        "exit exit exit exit . . body body body body body body"
        "exit exit exit exit . . body body body body body body"
        "exit exit exit exit . . body body body body body body"
        "exit exit exit exit . . body body body body body body";
}

.z-headline-inverted {
    align-items: center;
    justify-content: center;
}

.z-visual-inverted {
    align-items: flex-start;
    justify-content: flex-start;
    padding-top: 3vh;
    flex-direction: column;
    gap: 1.5rem;
}

.z-body-inverted {
    justify-content: flex-end;
    align-items: flex-start;
    padding-bottom: 4vh;
}

.z-exit-inverted {
    align-items: flex-end;
    justify-content: flex-start;
    padding-left: 2vw;
}

/* --- Typography --- */
.display-primary {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(48px, 7vw, 96px);
    letter-spacing: -0.03em;
    line-height: 0.95;
    color: var(--light-ground);
}

.display-primary.dark-text {
    color: var(--deep-substrate);
}

.secondary-display {
    font-family: var(--font-secondary);
    font-weight: 700;
    font-size: clamp(20px, 2.8vw, 42px);
    letter-spacing: -0.01em;
    line-height: 1.2;
    color: var(--trace-blue);
}

.body-text {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(16px, 1.2vw, 19px);
    line-height: 1.65;
    color: #C4CDD6;
    max-width: 55ch;
}

.body-text.dark-body {
    color: var(--mid-substrate);
}

.body-text strong {
    font-weight: 600;
}

.mono-text {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: clamp(12px, 1vw, 15px);
    letter-spacing: 0.02em;
    color: var(--trace-blue);
}

.dark-mono {
    color: var(--mid-substrate);
}

/* --- Bridge Zone Styles --- */
.bridge-annotation {
    position: relative;
    z-index: 1;
    background: var(--deep-substrate);
    padding: 0.25em 0.75em;
}

.spread-light .bridge-annotation {
    background: var(--light-ground);
}

.bridge-quote {
    position: relative;
    z-index: 1;
    background: var(--light-ground);
    padding: 0.25em 0.5em;
    font-style: italic;
}

.spread-dark .bridge-quote {
    background: var(--deep-substrate);
}

.bridge-stat {
    position: relative;
    z-index: 1;
    background: var(--deep-substrate);
    padding: 0.25em 0.75em;
    text-transform: uppercase;
}

.stat-divider {
    color: var(--solder-silver);
    margin: 0 0.5em;
}

/* --- Lottie / SVG Containers --- */
.lottie-container {
    width: 100%;
    max-width: 480px;
    aspect-ratio: 6 / 5;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lottie-container svg {
    width: 100%;
    height: 100%;
}

/* --- Isometric SVG Components --- */
.component {
    opacity: 0;
    transform: translateY(-20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.spread.in-view .component {
    opacity: 1;
    transform: translateY(0);
}

.chip-component { transition-delay: 0.2s; }
.resistor-1 { transition-delay: 0.5s; }
.capacitor-1 { transition-delay: 0.8s; }
.resistor-2 { transition-delay: 1.1s; }
.led-indicator { transition-delay: 1.4s; }

/* --- Trace Path Animations --- */
.trace-path {
    transition: stroke-dashoffset 1.5s ease;
}

.spread.in-view .trace-path {
    stroke-dashoffset: 0;
}

.spread.in-view .trace-path:nth-child(1) { transition-delay: 0.3s; }
.spread.in-view .trace-path:nth-child(2) { transition-delay: 0.6s; }
.spread.in-view .trace-path:nth-child(3) { transition-delay: 0.9s; }
.spread.in-view .trace-path:nth-child(4) { transition-delay: 1.2s; }

/* --- Connecting traces in logic gate section --- */
.connecting-trace {
    transition: stroke-dashoffset 1.2s ease;
}

.spread.in-view .connecting-trace {
    stroke-dashoffset: 0;
    transition-delay: 0.8s;
}

/* --- Gate group animations --- */
.gate-group {
    opacity: 0;
    transform: translateX(-15px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.spread.in-view .gate-group {
    opacity: 1;
    transform: translateX(0);
}

.spread.in-view .gate-group:nth-child(1) { transition-delay: 0.2s; }
.spread.in-view .gate-group:nth-child(2) { transition-delay: 0.5s; }
.spread.in-view .gate-group:nth-child(3) { transition-delay: 0.8s; }

/* --- Server unit animations --- */
.server-unit {
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.spread.in-view .server-unit {
    opacity: 1;
    transform: translateY(0);
}

.spread.in-view .server-unit:nth-child(2) { transition-delay: 0.2s; }
.spread.in-view .server-unit:nth-child(3) { transition-delay: 0.5s; }
.spread.in-view .server-unit:nth-child(4) { transition-delay: 0.8s; }

/* --- Network node animations --- */
.network-node {
    opacity: 0;
    transition: opacity 0.6s ease;
}

.spread.in-view .network-node {
    opacity: 1;
}

.spread.in-view .network-node:nth-child(1) { transition-delay: 0.1s; }
.spread.in-view .network-node:nth-child(2) { transition-delay: 0.3s; }
.spread.in-view .network-node:nth-child(3) { transition-delay: 0.5s; }
.spread.in-view .network-node:nth-child(4) { transition-delay: 0.7s; }
.spread.in-view .network-node:nth-child(5) { transition-delay: 0.9s; }

/* --- Network trace animations --- */
.network-trace {
    opacity: 0;
    transition: opacity 0.8s ease;
}

.spread.in-view .network-trace {
    opacity: 1;
    transition-delay: 1s;
}

/* --- Trace Divider --- */
.trace-divider {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 60px;
    z-index: 2;
}

.divider-trace {
    transition: stroke-dashoffset 1.2s ease;
}

.spread.in-view .divider-trace {
    stroke-dashoffset: 0;
    transition-delay: 1.5s;
}

.via-marker {
    opacity: 0;
    transition: opacity 0.4s ease;
}

.spread.in-view .via-marker {
    opacity: 1;
    transition-delay: 2s;
}

/* --- Scroll Arrow --- */
.scroll-arrow {
    width: 40px;
    height: 60px;
    animation: float-arrow 3s ease-in-out infinite;
}

.trace-arrow {
    width: 100%;
    height: 100%;
}

@keyframes float-arrow {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* --- Isometric Small Elements in Exit Zone --- */
.isometric-connector,
.isometric-chip-small,
.isometric-resistor-small {
    width: 80px;
    height: 80px;
    opacity: 0.7;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.isometric-connector:hover,
.isometric-chip-small:hover,
.isometric-resistor-small:hover {
    opacity: 1;
    transform: translateY(-1px);
}

/* --- Section Indicator (Pin Header Nav) --- */
.section-indicator {
    position: fixed;
    bottom: 3vh;
    right: 3vw;
    z-index: 100;
    display: flex;
    align-items: center;
}

.pin-header-nav {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 6px;
}

.pin-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--solder-silver);
    border: 1.5px solid var(--trace-blue);
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.pin-dot:hover {
    transform: translateY(-1px);
}

.pin-dot.active {
    background: var(--copper-accent);
    border-color: var(--copper-accent);
}

/* --- Back to Top Button --- */
#back-to-top {
    cursor: pointer;
}

#back-to-top .pin-dot {
    background: var(--mid-substrate);
    border-color: var(--mid-substrate);
}

#back-to-top .pin-dot.active {
    background: var(--copper-accent);
    border-color: var(--copper-accent);
}

/* --- Closing Section Styles --- */
.closing-headline {
    font-size: clamp(42px, 5.5vw, 80px);
}

.closing-text {
    max-width: 45ch;
}

.closing-signature {
    font-size: clamp(18px, 1.5vw, 24px);
    color: var(--mid-substrate);
    letter-spacing: 0.05em;
}

.closing-version {
    font-size: clamp(11px, 0.8vw, 13px);
    color: var(--solder-silver);
    margin-top: 0.5rem;
}

/* --- Solder Pad Bullet Points --- */
.z-body ul {
    list-style: none;
    padding-left: 1.5em;
}

.z-body ul li {
    position: relative;
    padding-left: 1em;
    margin-bottom: 0.5em;
}

.z-body ul li::before {
    content: '';
    position: absolute;
    left: -0.5em;
    top: 0.55em;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--copper-accent);
    border: 1px solid var(--trace-blue);
}

/* --- Link Styles --- */
a {
    color: var(--trace-blue);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--copper-accent);
}

/* --- Footprint Overlay (global subtle texture) --- */
.footprint-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    opacity: 0.03;
    background-image:
        repeating-linear-gradient(0deg, transparent, transparent 49px, var(--solder-silver) 49px, var(--solder-silver) 50px),
        repeating-linear-gradient(90deg, transparent, transparent 49px, var(--solder-silver) 49px, var(--solder-silver) 50px);
    background-size: 50px 50px;
}

/* --- Section Reveal Animations --- */
.spread .z-headline,
.spread .z-visual,
.spread .z-bridge,
.spread .z-body,
.spread .z-exit {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.spread.in-view .z-headline {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0.1s;
}

.spread.in-view .z-visual {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0.2s;
}

.spread.in-view .z-bridge {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0.4s;
}

.spread.in-view .z-body {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0.6s;
}

.spread.in-view .z-exit {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0.8s;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .z-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
        grid-template-areas:
            "headline"
            "visual"
            "bridge"
            "body"
            "exit";
        padding: 3vh 4vw;
        gap: 2vh;
        height: auto;
        min-height: 100vh;
    }

    .z-grid-inverted {
        grid-template-areas:
            "visual"
            "headline"
            "bridge"
            "body"
            "exit";
    }

    .z-headline {
        padding-top: 1vh;
    }

    .z-visual {
        justify-content: center;
    }

    .z-exit {
        justify-content: center;
        padding-right: 0;
    }

    .lottie-container {
        max-width: 320px;
    }

    .display-primary {
        font-size: clamp(36px, 8vw, 64px);
    }

    .closing-headline {
        font-size: clamp(32px, 7vw, 56px);
    }
}

@media (max-width: 640px) {
    .z-grid {
        padding: 2vh 5vw;
    }

    .display-primary {
        font-size: clamp(28px, 10vw, 48px);
    }

    .secondary-display {
        font-size: clamp(16px, 4vw, 24px);
    }

    .lottie-container {
        max-width: 260px;
    }

    .section-indicator {
        bottom: 2vh;
        right: 2vw;
    }

    .pin-dot {
        width: 8px;
        height: 8px;
    }
}

/* --- Selection --- */
::selection {
    background: var(--trace-blue);
    color: var(--light-ground);
}