/**
 * Discography Timeline Component Styles
 * Horizontal mini-visualization showing albums plotted by release year.
 * Dark theme, oklch colors, native CSS nesting.
 * @version 1.0.0
 */

/* ============================================================
   ERA COLOR CUSTOM PROPERTIES
   ============================================================ */

:root {
    --era-early:  oklch(0.55 0.08 250);   /* 1978-1983: industrial blue-gray */
    --era-mid:    oklch(0.65 0.15 45);     /* 1984-1987: burned orange */
    --era-golden: oklch(0.70 0.12 85);     /* 1988-1995: amber gold */
    --era-late:   oklch(0.55 0.12 300);    /* 1996-2011: deep purple */
}

/* ============================================================
   TIMELINE CONTAINER
   ============================================================ */

.discography-timeline {
    position: relative;
    padding: 1.5rem 1.25rem 2.5rem;
    margin-bottom: 1rem;
    background: oklch(0.2 0.005 260);
    border: 1px solid oklch(0.3 0.005 260);
    border-radius: var(--radius-lg, 12px);
    overflow-x: auto;
    overflow-y: visible;
    -webkit-overflow-scrolling: touch;

    /* Subtle scrollbar */
    &::-webkit-scrollbar {
        height: 4px;
    }

    &::-webkit-scrollbar-track {
        background: transparent;
    }

    &::-webkit-scrollbar-thumb {
        background: oklch(0.35 0.005 260);
        border-radius: 2px;
    }
}

/* ============================================================
   TIMELINE TRACK (the scrollable inner area)
   ============================================================ */

.discography-timeline__track {
    position: relative;
    min-width: 600px;
    height: 48px;
    margin: 0 auto;
}

/* ============================================================
   CONNECTING LINE
   ============================================================ */

.discography-timeline__line {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    height: 2px;
    background: linear-gradient(
        to right,
        var(--era-early),
        var(--era-mid),
        var(--era-golden),
        var(--era-late)
    );
    border-radius: 1px;
    opacity: 0.5;
}

/* ============================================================
   YEAR MARKERS (ticks + labels)
   ============================================================ */

.discography-timeline__year {
    position: absolute;
    top: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    transform: translateX(-50%);
    pointer-events: none;
    user-select: none;

    &::before {
        content: '';
        display: block;
        width: 1px;
        height: 10px;
        background: oklch(0.45 0.005 260);
        margin-bottom: 4px;
    }

    & span {
        font-size: 0.6875rem;
        font-weight: 500;
        font-family: var(--font-primary, 'Inter', sans-serif);
        color: oklch(0.55 0.01 260);
        white-space: nowrap;
        line-height: 1;
    }
}

/* ============================================================
   ALBUM DOTS
   ============================================================ */

.discography-timeline__dot {
    position: absolute;
    top: 50%;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    cursor: pointer;
    border: 2px solid oklch(0.15 0.005 260);
    transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease;
    z-index: 2;

    /* Era colors via data attributes */
    &[data-era="early"] {
        background: var(--era-early);
    }

    &[data-era="mid"] {
        background: var(--era-mid);
    }

    &[data-era="golden"] {
        background: var(--era-golden);
    }

    &[data-era="late"] {
        background: var(--era-late);
    }

    /* Hover / focus */
    &:hover,
    &:focus-visible {
        transform: translate(-50%, -50%) scale(1.5);
        border-color: oklch(0.9 0.01 260);
        z-index: 5;
    }

    &[data-era="early"]:hover,
    &[data-era="early"]:focus-visible {
        box-shadow: 0 0 8px 2px oklch(0.55 0.08 250 / 0.6);
    }

    &[data-era="mid"]:hover,
    &[data-era="mid"]:focus-visible {
        box-shadow: 0 0 8px 2px oklch(0.65 0.15 45 / 0.6);
    }

    &[data-era="golden"]:hover,
    &[data-era="golden"]:focus-visible {
        box-shadow: 0 0 8px 2px oklch(0.70 0.12 85 / 0.6);
    }

    &[data-era="late"]:hover,
    &[data-era="late"]:focus-visible {
        box-shadow: 0 0 8px 2px oklch(0.55 0.12 300 / 0.6);
    }

    &:focus-visible {
        outline: 2px solid var(--accent, #dc2626);
        outline-offset: 3px;
    }

    /* Active era highlight (when album-filters selects an era) */
    &[data-muted="true"] {
        opacity: 0.25;
        transform: translate(-50%, -50%) scale(0.8);
    }
}

/* ============================================================
   TOOLTIP
   ============================================================ */

.discography-timeline__tooltip {
    position: absolute;
    bottom: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%);
    padding: 0.375rem 0.625rem;
    background: oklch(0.15 0.005 260);
    color: oklch(0.92 0.005 260);
    font-size: 0.75rem;
    font-weight: 500;
    font-family: var(--font-primary, 'Inter', sans-serif);
    line-height: 1.3;
    white-space: nowrap;
    border-radius: 6px;
    border: 1px solid oklch(0.3 0.005 260);
    pointer-events: none;
    opacity: 0;
    transition: opacity 150ms ease, transform 150ms ease;
    transform: translateX(-50%) translateY(4px);
    z-index: 10;

    /* Arrow pointer */
    &::after {
        content: '';
        position: absolute;
        top: 100%;
        left: 50%;
        transform: translateX(-50%);
        border: 5px solid transparent;
        border-top-color: oklch(0.15 0.005 260);
    }
}

/* Show tooltip on dot hover */
.discography-timeline__dot:hover .discography-timeline__tooltip,
.discography-timeline__dot:focus-visible .discography-timeline__tooltip {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Tooltip year highlight */
.discography-timeline__tooltip-year {
    color: oklch(0.65 0.01 260);
    margin-left: 0.25rem;
}

/* ============================================================
   ERA LEGEND (small inline labels)
   ============================================================ */

.discography-timeline__legend {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 0.75rem;
    padding-top: 0.5rem;
}

.discography-timeline__legend-item {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.6875rem;
    font-family: var(--font-primary, 'Inter', sans-serif);
    color: oklch(0.55 0.01 260);
    user-select: none;

    &::before {
        content: '';
        display: inline-block;
        width: 8px;
        height: 8px;
        border-radius: 50%;
    }

    &[data-era="early"]::before {
        background: var(--era-early);
    }

    &[data-era="mid"]::before {
        background: var(--era-mid);
    }

    &[data-era="golden"]::before {
        background: var(--era-golden);
    }

    &[data-era="late"]::before {
        background: var(--era-late);
    }
}

/* ============================================================
   RESPONSIVE: MOBILE
   ============================================================ */

@media (max-width: 768px) {
    .discography-timeline {
        padding: 1rem 0.75rem 2rem;
        scroll-snap-type: x mandatory;
    }

    .discography-timeline__track {
        min-width: 500px;
        height: 40px;
        scroll-snap-align: start;
    }

    .discography-timeline__dot {
        width: 10px;
        height: 10px;
    }

    .discography-timeline__year span {
        font-size: 0.625rem;
    }

    .discography-timeline__legend {
        gap: 0.5rem;
    }

    .discography-timeline__legend-item {
        font-size: 0.625rem;
    }
}

@media (max-width: 480px) {
    .discography-timeline__track {
        min-width: 420px;
        height: 36px;
    }

    .discography-timeline__dot {
        width: 8px;
        height: 8px;
        border-width: 1.5px;
    }

    .discography-timeline__tooltip {
        font-size: 0.6875rem;
        padding: 0.25rem 0.5rem;
    }
}

/* ============================================================
   REDUCED MOTION
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
    .discography-timeline__dot {
        transition: none;
    }

    .discography-timeline__tooltip {
        transition: none;
    }
}

/* ============================================================
   LIGHT THEME OVERRIDES
   ============================================================ */

[data-theme="light"] {
    & .discography-timeline {
        background: oklch(0.96 0.005 260);
        border-color: oklch(0.88 0.005 260);
    }

    & .discography-timeline__line {
        opacity: 0.35;
    }

    & .discography-timeline__year::before {
        background: oklch(0.75 0.005 260);
    }

    & .discography-timeline__year span {
        color: oklch(0.5 0.01 260);
    }

    & .discography-timeline__dot {
        border-color: oklch(0.96 0.005 260);
    }

    & .discography-timeline__tooltip {
        background: oklch(0.2 0.005 260);
        border-color: oklch(0.35 0.005 260);
        color: oklch(0.92 0.005 260);

        &::after {
            border-top-color: oklch(0.2 0.005 260);
        }
    }

    & .discography-timeline__legend-item {
        color: oklch(0.45 0.01 260);
    }
}