/*************************************/
/************* VARIABLES *************/
/*************************************/

html {
    /* "ESA mission-control": deep space navy + cyan/amber accents */
    --color-platform: #22D3EE;        /* Cyan — ring nodes */
    --color-building-block: #F5A623;  /* Amber — center nodes */
    --color-text: #E6EDF3;
    --color-bg-page: #060A18;
    --color-bg-panel: #0A1128;
    --color-bg-elevated: #101B3B;
    --color-border: rgba(148, 197, 214, 0.18);
    --color-gradient: linear-gradient(to right, var(--color-platform), var(--color-building-block));
}

body {
    margin: 0;
    font-family: 'Roboto', 'Antarctica', sans-serif;
    background-color: var(--color-bg-page);
}

.central-network {
    background: var(--color-building-block);
    padding: 0.1em 0.3em;
    font-weight: 700;
    color: #0A1128;
}

p {
    line-height: 140%;
    color: var(--color-text);
}

a {
    border-bottom: 3px solid var(--color-platform);
    border-image: var(--color-gradient) 1;
    font-weight: 700;
    cursor: pointer;
    color: var(--color-text);
    text-decoration: none;
}

/*************************************/
/*************** INTRO ***************/
/*************************************/

#chart-wrapper {
    max-width: 1400px;
    border-top: 10px solid var(--color-building-block);
    border-image: var(--color-gradient) 1;
    margin: 0 auto;
    background-color: var(--color-bg-page);
}

#chart-introduction {
    background: linear-gradient(to bottom, rgba(6, 10, 24, 0) 50%, rgba(6, 10, 24, 1) 100%);
    padding: 3em 5em 2em 5em;

    display: grid;
    justify-content: center;
    align-items: top;

    grid-template-columns: 1fr 2fr;
    column-gap: 5em;
    row-gap: 5em;
}

#chart-title {
    grid-column-start: 1;
    grid-column-end: 1;
}

#chart-title h1 {
    font-weight: 400;
    font-size: 2.4em;
    font-style: italic;
    margin-bottom: 0.2em;
    margin-top: 0em;
    color: var(--color-text);
}

#chart-title h1#chart-title-main {
    font-weight: 700;
    font-size: 2.6em;
    margin-top: 0.2em;
    font-style: normal;
}

#chart-intro-text {
    grid-column-start: 2;
    grid-column-end: 2;
    font-weight: 400;
    font-size: 1.1em;
}

.chart-caveat {
    font-size: 0.85em;
    opacity: 0.65;
    font-style: italic;
    margin-top: 0.6em;
}

/*************************************/
/*************** CHART ***************/
/*************************************/

/* This is all done within the createPlatformNetworkVisual function */

#chart-container {
    position: relative;
    background-color: var(--color-bg-panel);
    width: 100%;
    min-height: 800px;
    padding: 20px;
    box-sizing: border-box;
    overflow: hidden;
}

#chart-container canvas {
    display: block;
}

#canvas, #canvas-click {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 0;
    transition: opacity 200ms ease-in;
}

#canvas-hover {
    position: relative;
    z-index: 1
}

/* Mobile-only elements — hidden on desktop */
#mobile-info-btn,
#mobile-info-overlay,
#mobile-drawer,
#mobile-pan-hint { display: none; }

/* Legend */
#chart-legend {
    padding: 40px 48px;
    max-width: 1400px;
    margin: 0 auto;
    font-family: 'Roboto', sans-serif;
    background-color: var(--color-bg-page);
}

.legend-title {
    text-align: center;
    font-size: 15px;
    text-transform: uppercase;
    letter-spacing: 3px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 40px;
    padding-bottom: 6px;
    display: inline-block;
    border-bottom: 1px solid var(--color-border);
    width: 100%;
}

.legend-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 44px 48px;
    max-width: 900px;
    margin: 0 auto;
}

.legend-section-header {
    font-size: 15px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-text);
    margin-bottom: 18px;
}

.legend-color-items {
    display: flex;
    gap: 24px;
    align-items: center;
    flex-wrap: wrap;
}

.legend-color-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.legend-swatch {
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.legend-swatch--platform {
    background-color: var(--color-platform);
    border-radius: 50%;
    width: 28px;
    height: 28px;
}

.legend-swatch--building-block {
    background-color: var(--color-building-block);
    border-radius: 6px;
    width: 24px;
    height: 24px;
}

.legend-color-label {
    font-size: 15px;
    font-weight: 500;
}

.legend-size-row {
    margin-bottom: 18px;
}

.legend-size-circles {
    display: flex;
    align-items: flex-end;
    gap: 10px;
    margin-bottom: 8px;
}

.legend-text {
    font-size: 14px;
    color: #9aa5c0;
    line-height: 1.5;
    margin: 0 0 16px 0;
}

.legend-description {
    font-size: 13px;
    color: #6f7996;
    margin: 0;
    line-height: 1.4;
}

.legend-lines-svg {
    display: block;
    width: 200px;
    height: 24px;
    margin-bottom: 8px;
}

/* Responsive: Stack on small screens */
@media (max-width: 768px) {
    #chart-introduction {
        grid-template-columns: 1fr;
        padding: 1.5em 1.5em 1em 1.5em;
        column-gap: 0;
        row-gap: 1em;
    }

    #chart-title {
        grid-column: 1;
    }

    #chart-intro-text {
        grid-column: 1;
        font-size: 0.95em;
    }

    #chart-title h1 {
        font-size: 1.8em;
    }

    #chart-title h1#chart-title-main {
        font-size: 2em;
    }

    #chart-container {
        min-height: 400px;
        padding: 10px;
    }

    /* === Chart-first mobile layout === */

    /* Hide desktop intro and wrapper border */
    #chart-wrapper { border-top: none; border-image: none; }
    #chart-introduction { display: none; }

    /* Chart fills the viewport */
    #chart-container {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        min-height: unset;
        padding: 0;
        overflow: hidden;
        touch-action: none;
    }

    /* Edge fade gradient overlay */
    #chart-container::after {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        pointer-events: none;
        z-index: 5;
        background:
            linear-gradient(to right, var(--color-bg-panel) 0%, transparent 15%),
            linear-gradient(to left, var(--color-bg-panel) 0%, transparent 15%),
            linear-gradient(to bottom, var(--color-bg-panel) 0%, transparent 12%),
            linear-gradient(to top, var(--color-bg-panel) 0%, transparent 12%);
        transition: opacity 0.3s ease;
    }

    #chart-container.node-selected::after {
        opacity: 0;
    }

    /* Pan hint */
    #mobile-pan-hint {
        display: none;
        position: fixed;
        top: 40%;
        left: 50%;
        transform: translate(-50%, -50%);
        z-index: 6;
        flex-direction: column;
        align-items: center;
        gap: 8px;
        pointer-events: none;
        animation: panHintFade 2.5s ease-in-out forwards;
    }

    .pan-hint-icon {
        font-size: 32px;
        animation: panMotion 2s ease-in-out infinite;
    }

    .pan-hint-text {
        font-size: 14px;
        font-weight: 600;
        color: var(--color-text);
        opacity: 0.9;
    }

    @keyframes panHintFade {
        0% { opacity: 0; }
        15% { opacity: 1; }
        70% { opacity: 1; }
        100% { opacity: 0; }
    }

    @keyframes panMotion {
        0% { transform: translate(0, 0); }
        25% { transform: translate(8px, -4px); }
        50% { transform: translate(-6px, 6px); }
        75% { transform: translate(4px, 2px); }
        100% { transform: translate(0, 0); }
    }

    /* Info button */
    #mobile-info-btn {
        position: absolute;
        top: 12px;
        left: 12px;
        z-index: 10;
        background: rgba(10, 17, 40, 0.85);
        border: 1px solid var(--color-building-block);
        color: var(--color-building-block);
        font-size: 16px;
        font-weight: 700;
        width: 44px;
        height: 44px;
        border-radius: 22px;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 0;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    }

    /* Info overlay */
    #mobile-info-overlay {
        display: block;
        position: fixed;
        inset: 0;
        z-index: 200;
        background-color: var(--color-bg-page);
        transform: translateY(100%);
        transition: transform 0.3s ease;
        padding: 24px;
        box-sizing: border-box;
        overflow-y: auto;
    }

    #mobile-info-overlay.active {
        transform: translateY(0);
    }

    #mobile-info-close {
        position: absolute;
        top: 12px;
        right: 12px;
        min-width: 44px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        background: none;
        border: none;
        font-size: 24px;
        color: var(--color-text);
        cursor: pointer;
    }

    #mobile-info-content {
        padding-top: 48px;
    }

    /* Bottom drawer — tooltip only; hidden until a node is tapped */
    #mobile-drawer {
        display: block;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 100;
        background-color: var(--color-bg-elevated);
        box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.4);
        max-height: 40vh;
        overflow-y: auto;
        overscroll-behavior: contain;
        box-sizing: border-box;
        padding: 16px;
        padding-right: 44px;
        transform: translateY(100%);
        transition: transform 0.25s ease;
    }

    #mobile-drawer[data-mode="tooltip"] {
        transform: translateY(0);
    }

    #mobile-drawer-tooltip-close {
        position: absolute;
        top: 8px;
        right: 8px;
        min-width: 44px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        background: none;
        border: none;
        font-size: 20px;
        color: var(--color-text);
        cursor: pointer;
    }

    /* Tooltip content typography */
    #mobile-drawer-tooltip-content .tooltip-type-label {
        font-size: 13px;
        font-style: italic;
        opacity: 0.7;
        margin: 0 0 4px 0;
    }

    #mobile-drawer-tooltip-content .tooltip-title {
        font-size: 18px;
        font-weight: 700;
        margin: 0 0 4px 0;
        word-break: break-word;
    }

    #mobile-drawer-tooltip-content .tooltip-subtitle {
        font-size: 14px;
        opacity: 0.7;
        margin: 0 0 8px 0;
    }

    #mobile-drawer-tooltip-content .tooltip-section {
        margin-top: 10px;
        padding-top: 10px;
        border-top: 1px solid var(--color-border);
        font-size: 14px;
        line-height: 1.5;
    }

    /* Node-type accent for drawer tooltip */
    #mobile-drawer[data-node-type="platform"] { border-left: 4px solid var(--color-platform); }
    #mobile-drawer[data-node-type="buildingBlock"] { border-left: 4px solid var(--color-building-block); }

    #chart-legend {
        display: none;
    }

    #mobile-info-content #chart-legend {
        display: block;
        padding: 24px 0 0 0;
    }

    #mobile-info-content .legend-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}