:root {
    /* Color Palette - Light Mode */
    --bg-page: #ffffff;
    --bg-card: #ffffff;
    --card-border: rgba(226, 232, 240, 0.7);
    --card-shadow: 0 16px 40px -10px rgba(20, 35, 60, 0.08), 0 2px 6px rgba(0, 0, 0, 0.02);

    --text-primary: #2b303c;
    --text-secondary: #000000;
    --text-muted: #8e9cae;

    /* Disconnected Cable Colors */
    --cable-cyan: #a6e5fc;
    --cable-green: #00e575;

    /* Typography */
    --font-heading: 'Open Sans', 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Open Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    --transition-smooth: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark Mode Palette */
[data-theme="dark"] {
    --bg-page: #0a0e17;
    --bg-card: #121824;
    --card-border: rgba(255, 255, 255, 0.08);
    --card-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.7), 0 0 1px rgba(255, 255, 255, 0.1);

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --cable-cyan: #38bdf8;
    --cable-green: #34d399;
}

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

body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-page);
    background-image:
        radial-gradient(circle at 15% 15%, rgba(166, 229, 252, 0.18) 0%, transparent 45%),
        radial-gradient(circle at 85% 85%, rgba(0, 229, 117, 0.12) 0%, transparent 45%);
    font-family: var(--font-body);
    color: var(--text-secondary);
    padding: 32px 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow: hidden;
    height: 100vh;
}

/* Floating Theme Toggle (Top Right) */
.page-controls {
    position: fixed;
    top: 20px;
    right: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 100;
}

.control-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--card-border);
    color: var(--text-secondary);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    transition: var(--transition-smooth);
}

.control-btn:hover {
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.control-btn svg {
    width: 17px;
    height: 17px;
    fill: currentColor;
}

/* Main Card Wrapper */
.maintenance-card {
    width: 100%;
    max-width: 1240px;
    background: var(--bg-card);
    border: 1px solid var(--card-border);
    border-radius: 14px;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    transition: var(--transition-smooth);
    animation: fadeInCard 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    height: 90vh;
    justify-content: center;
}

@keyframes fadeInCard {
    from {
        opacity: 0;
        transform: translateY(16px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Card Header Section */
.card-header {
    padding: 64px 36px 14px 36px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

/* Main Heading */
.main-title {
    font-family: var(--font-heading);
    font-size: 43px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.28;
    letter-spacing: -0.5px;
    margin-bottom: 14px;
    text-transform: uppercase;
}

.subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 520px;
    margin: 0 auto;
}

/* Central Disconnect Graphic Container (Edge-to-Edge) */
.illustration-container {
    width: 100%;
    position: relative;
    padding: 36px 0 64px 0;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

.cables-svg {
    width: 100%;
    height: 180px;
    display: block;
    user-select: none;
}

/* Plugs Floating Animation */
.plug-left-group {
    animation: plugHoverLeft 4.5s ease-in-out infinite alternate;
    transform-origin: 350px 130px;
}

.plug-right-group {
    animation: plugHoverRight 4.5s ease-in-out infinite alternate;
    transform-origin: 630px 130px;
}

@keyframes plugHoverLeft {
    0% {
        transform: translateX(0px);
    }

    50% {
        transform: translateX(-3px);
    }

    100% {
        transform: translateX(0px);
    }
}

@keyframes plugHoverRight {
    0% {
        transform: translateX(0px);
    }

    50% {
        transform: translateX(3px);
    }

    100% {
        transform: translateX(0px);
    }
}

/* Interactive Magnetic Hover on SVG */
.cables-svg:hover .plug-left-group {
    transform: translateX(6px);
    transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.cables-svg:hover .plug-right-group {
    transform: translateX(-6px);
    transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Floating Geometric Shards */
.floating-shard {
    transition: transform 0.3s ease;
    cursor: pointer;
}

.shard-l1 {
    animation: floatShardL1 3.5s ease-in-out infinite alternate;
}

.shard-l2 {
    animation: floatShardL2 4.0s ease-in-out infinite alternate;
}

.shard-r1 {
    animation: floatShardR1 3.8s ease-in-out infinite alternate;
}

.shard-r2 {
    animation: floatShardR2 4.2s ease-in-out infinite alternate;
}

@keyframes floatShardL1 {
    0% {
        transform: translateY(0px) rotate(0deg);
    }

    100% {
        transform: translateY(-5px) rotate(-4deg);
    }
}

@keyframes floatShardL2 {
    0% {
        transform: translateY(0px) rotate(0deg);
    }

    100% {
        transform: translateY(5px) rotate(4deg);
    }
}

@keyframes floatShardR1 {
    0% {
        transform: translateY(0px) rotate(0deg);
    }

    100% {
        transform: translateY(-5px) rotate(4deg);
    }
}

@keyframes floatShardR2 {
    0% {
        transform: translateY(0px) rotate(0deg);
    }

    100% {
        transform: translateY(5px) rotate(-4deg);
    }
}

/* Disconnected Sparks Animation */
.spark-particle {
    opacity: 0;
    animation: sparkFlicker 3s infinite ease-in-out;
}

.spark-p1 {
    animation-delay: 0.2s;
}

.spark-p2 {
    animation-delay: 1.2s;
}

.spark-p3 {
    animation-delay: 2.1s;
}

@keyframes sparkFlicker {

    0%,
    100% {
        opacity: 0;
        transform: scale(0.6);
    }

    48% {
        opacity: 0.1;
    }

    50% {
        opacity: 0.95;
        transform: scale(1.3);
    }

    52% {
        opacity: 0.2;
    }
}

/* Cable Pulse Animations */
.cable-pulse-cyan {
    stroke-dasharray: 70 450;
    animation: travelPulseLeft 5s linear infinite;
}

.cable-pulse-green {
    stroke-dasharray: 70 450;
    animation: travelPulseRight 5s linear infinite;
}

@keyframes travelPulseLeft {
    0% {
        stroke-dashoffset: 520;
    }

    100% {
        stroke-dashoffset: 0;
    }
}

@keyframes travelPulseRight {
    0% {
        stroke-dashoffset: 0;
    }

    100% {
        stroke-dashoffset: -520;
    }
}

/* Responsive Breakpoints */
@media (max-width: 768px) {
    .card-header {
        padding: 48px 20px 10px 20px;
    }

    .main-title {
        font-size: 26px;
    }

    .subtitle {
        font-size: 14px;
    }

    .br-desktop {
        display: none;
    }

    .illustration-container {
        padding: 24px 0 48px 0;
    }
}

@media (max-width: 480px) {
    body {
        padding: 12px 8px;
    }

    .card-header {
        padding: 36px 14px 8px 14px;
    }

    .main-title {
        font-size: 22px;
    }

    .cables-svg {
        height: 140px;
    }

    .illustration-container {
        padding: 16px 0 36px 0;
    }
}

@media (max-width: 768px) {
    .maintenance-card {
        height: 100vh;
    }
}