/* ============================================================
   algoha.com — Retro-futuristic Observatory
   --------------------------------------------------------------
   Palette (DESIGN.md):
     #0A1224  Midnight Abyss   — primary bg, hero zone, deep surfaces
     #162236  Naval Steel      — panel background
     #2A2F38  Deep Graphite    — body text on light panels
     #3B6B8A  Observatory Blue — timeline spine, secondary accents
     #5A8BA6  Steel Whisper    — metadata / labels
     #C8D1DA  Lunar Ash        — body text on dark
     #D4A84B  Analog Gold      — epoch markers, highlights, links
     #E8934A  Phosphor Amber   — hover, typewriter cursor, signals
     #E8E2D8  Parchment Gray   — rare light panels
   --------------------------------------------------------------
   Fonts:
     Anybody (Google)       — display / headlines
     Source Serif 4 (Google)— body / narrative
     Overpass Mono (Google) — labels / metadata
   ============================================================ */

:root {
    --c-bg:        #0A1224;
    --c-surface:   #162236;
    --c-graphite:  #2A2F38;
    --c-blue:      #3B6B8A;
    --c-steel:     #5A8BA6;
    --c-lunar:     #C8D1DA;
    --c-gold:      #D4A84B;
    --c-amber:     #E8934A;
    --c-parchment: #E8E2D8;

    --f-display: 'Anybody', 'Helvetica Neue', Arial, sans-serif;
    --f-body:    'Source Serif 4', 'Source Serif Pro', Georgia, serif;
    --f-mono:    'Overpass Mono', 'SFMono-Regular', Menlo, monospace;

    --spine-x: 33%;
    --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--c-bg);
    color: var(--c-lunar);
    font-family: var(--f-body);
    font-size: 18px;
    line-height: 1.72;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
}

/* ------------------------------------------------------------
   CRT scan-line overlay — subtle, non-distracting
   ------------------------------------------------------------ */
#scanline-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 60;
    background: repeating-linear-gradient(
        0deg,
        rgba(232, 226, 216, 0.03) 0,
        rgba(232, 226, 216, 0.03) 1px,
        transparent 1px,
        transparent 3px
    );
    mix-blend-mode: overlay;
}

/* ------------------------------------------------------------
   Bokeh drifting atmosphere
   ------------------------------------------------------------ */
#bokeh-bg {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.bokeh-circle {
    position: absolute;
    border-radius: 50%;
    filter: blur(24px);
    will-change: transform, opacity;
    animation: drift 60s infinite ease-in-out;
}

.bokeh-1  { width: 200px; height: 200px; top: 8%;  left: 6%;   background: radial-gradient(circle, rgba(212,168,75,0.12) 0%, transparent 70%); animation-delay:   0s; }
.bokeh-2  { width: 150px; height: 150px; top: 24%; left: 62%;  background: radial-gradient(circle, rgba(59,107,138,0.10) 0%, transparent 70%);  animation-delay:  -6s; }
.bokeh-3  { width: 120px; height: 120px; top: 48%; left: 18%;  background: radial-gradient(circle, rgba(232,147,74,0.09) 0%, transparent 70%);  animation-delay: -11s; }
.bokeh-4  { width: 180px; height: 180px; top: 66%; left: 72%;  background: radial-gradient(circle, rgba(90,139,166,0.10) 0%, transparent 70%);  animation-delay:  -4s; }
.bokeh-5  { width:  90px; height:  90px; top: 14%; left: 82%;  background: radial-gradient(circle, rgba(212,168,75,0.08) 0%, transparent 70%);  animation-delay: -18s; }
.bokeh-6  { width: 160px; height: 160px; top: 82%; left: 38%;  background: radial-gradient(circle, rgba(59,107,138,0.09) 0%, transparent 70%);  animation-delay:  -2s; }
.bokeh-7  { width:  70px; height:  70px; top:  4%; left: 46%;  background: radial-gradient(circle, rgba(232,147,74,0.10) 0%, transparent 70%);  animation-delay: -15s; }
.bokeh-8  { width: 140px; height: 140px; top: 58%; left:  8%;  background: radial-gradient(circle, rgba(212,168,75,0.06) 0%, transparent 70%);  animation-delay: -22s; }
.bokeh-9  { width: 110px; height: 110px; top: 40%; left: 88%;  background: radial-gradient(circle, rgba(90,139,166,0.09) 0%, transparent 70%);  animation-delay:  -8s; }
.bokeh-10 { width: 200px; height: 200px; top: 28%; left: 32%;  background: radial-gradient(circle, rgba(59,107,138,0.06) 0%, transparent 70%);  animation-delay: -30s; }
.bokeh-11 { width:  60px; height:  60px; top: 74%; left: 54%;  background: radial-gradient(circle, rgba(232,147,74,0.11) 0%, transparent 70%);  animation-delay: -14s; }
.bokeh-12 { width: 130px; height: 130px; top: 90%; left: 82%;  background: radial-gradient(circle, rgba(212,168,75,0.08) 0%, transparent 70%);  animation-delay: -20s; }
.bokeh-13 { width:  45px; height:  45px; top: 20%; left: 20%;  background: radial-gradient(circle, rgba(232,147,74,0.12) 0%, transparent 70%);  animation-delay: -12s; }
.bokeh-14 { width:  40px; height:  40px; top: 52%; left: 48%;  background: radial-gradient(circle, rgba(212,168,75,0.10) 0%, transparent 70%);  animation-delay: -26s; }

@keyframes drift {
    0%,100% { transform: translate(0, 0);      opacity: 0.55; }
    33%     { transform: translate(22px,-18px); opacity: 0.85; }
    66%     { transform: translate(-16px,14px); opacity: 0.40; }
}

/* ------------------------------------------------------------
   Fixed instrument frame (top + bottom strips)
   ------------------------------------------------------------ */
.instrument-frame {
    position: fixed;
    left: 0;
    right: 0;
    z-index: 40;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.55rem 1.25rem;
    font-family: var(--f-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--c-steel);
    background: linear-gradient(180deg, rgba(10,18,36,0.88), rgba(10,18,36,0.55));
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    pointer-events: none;
}

#frame-top {
    top: 0;
    border-bottom: 1px solid rgba(59,107,138,0.35);
}

#frame-bottom {
    bottom: 0;
    border-top: 1px solid rgba(59,107,138,0.35);
    background: linear-gradient(0deg, rgba(10,18,36,0.88), rgba(10,18,36,0.55));
}

.frame-id,
.frame-channel {
    color: var(--c-gold);
    letter-spacing: 0.2em;
}

.frame-coords,
.frame-mode {
    opacity: 0.8;
}

.frame-clock {
    display: inline-flex;
    gap: 0.6rem;
    align-items: baseline;
    color: var(--c-gold);
}

.frame-label {
    color: var(--c-steel);
    letter-spacing: 0.18em;
}

#mission-clock {
    color: var(--c-gold);
    text-shadow: 0 0 10px rgba(212,168,75,0.45);
    font-variant-numeric: tabular-nums;
}

.frame-signal {
    display: inline-flex;
    gap: 3px;
    align-items: flex-end;
    height: 12px;
}

.signal-bar {
    width: 3px;
    background: var(--c-steel);
    opacity: 0.55;
}
.signal-bar:nth-child(1) { height: 3px; }
.signal-bar:nth-child(2) { height: 5px; }
.signal-bar:nth-child(3) { height: 7px; animation: signalPulse 2s infinite ease-in-out; }
.signal-bar:nth-child(4) { height: 9px; animation: signalPulse 2s infinite ease-in-out; animation-delay: 0.3s; }
.signal-bar:nth-child(5) { height: 11px; background: var(--c-gold); animation: signalPulse 2s infinite ease-in-out; animation-delay: 0.6s; }

@keyframes signalPulse {
    0%,100% { opacity: 0.55; }
    50%     { opacity: 1; }
}

/* ------------------------------------------------------------
   Hero zone
   ------------------------------------------------------------ */
#hero {
    position: relative;
    z-index: 2;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6rem 2rem 4rem;
    overflow: hidden;
}

/* dense warm bokeh pocket in hero, created via pseudo-element */
#hero::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        radial-gradient(circle at 25% 40%, rgba(212,168,75,0.10) 0%, transparent 34%),
        radial-gradient(circle at 72% 60%, rgba(232,147,74,0.08) 0%, transparent 38%),
        radial-gradient(circle at 50% 90%, rgba(59,107,138,0.08) 0%, transparent 50%);
    z-index: -1;
}

.hero-content {
    max-width: 980px;
    width: 100%;
    position: relative;
    z-index: 2;
}

.hero-readouts {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 1.75rem;
    opacity: 0;
    animation: fadeInUp 1s var(--ease-out) forwards;
    animation-delay: 0.2s;
}

.readout-bar {
    height: 1px;
    background: var(--c-blue);
    opacity: 0.4;
    width: 100%;
    max-width: 480px;
    position: relative;
}

.readout-bar:nth-child(1) { width: 120px; opacity: 0.6; }
.readout-bar:nth-child(2) { width: 320px; opacity: 0.45; }
.readout-bar:nth-child(3) { width: 240px; opacity: 0.35; }
.readout-bar:nth-child(4) { width: 400px; opacity: 0.5; background: linear-gradient(90deg, var(--c-blue), transparent); }

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.25rem;
    margin-bottom: 2rem;
    font-family: var(--f-mono);
    font-size: 12px;
    color: var(--c-steel);
    letter-spacing: 0.16em;
    opacity: 0;
    animation: fadeInUp 0.9s var(--ease-out) forwards;
    animation-delay: 0.4s;
}

.meta-block {
    padding: 0.25rem 0.55rem;
    border: 1px solid rgba(90,139,166,0.35);
    background: rgba(22,34,54,0.3);
}

.meta-block:first-child {
    color: var(--c-gold);
    border-color: rgba(212,168,75,0.45);
}

#hero-title {
    font-family: var(--f-display);
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.05;
    color: var(--c-parchment);
    margin-bottom: 2rem;
    display: block;
}

.hero-title-static {
    display: block;
    font-size: clamp(40px, 7vw, 84px);
    font-weight: 300;
    color: var(--c-lunar);
    margin-bottom: 0.4rem;
    opacity: 0;
    animation: fadeInUp 1s var(--ease-out) forwards;
    animation-delay: 0.6s;
}

.hero-title-typed {
    display: block;
    min-height: 1.2em;
}

#typewriter-line {
    font-family: var(--f-mono);
    font-size: clamp(18px, 2.1vw, 22px);
    color: var(--c-gold);
    letter-spacing: 0.04em;
    white-space: pre-wrap;
    word-break: break-word;
    line-height: 1.5;
    margin: 0.3rem 0 0;
}

#typewriter-text {
    color: var(--c-gold);
}

#typewriter-cursor {
    display: inline-block;
    width: 10px;
    height: 1.05em;
    background: var(--c-amber);
    margin-left: 3px;
    vertical-align: text-bottom;
    opacity: 0;
    transition: opacity 0.08s linear;
}

#typewriter-cursor.visible { opacity: 1; }

.hero-subtitle {
    max-width: 620px;
    font-family: var(--f-body);
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--c-lunar);
    font-style: italic;
    opacity: 0;
    animation: fadeInUp 1s var(--ease-out) forwards;
    animation-delay: 1.8s;
}

.hero-scroll-indicator {
    margin-top: 3rem;
    display: inline-flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
    cursor: pointer;
    color: var(--c-steel);
    opacity: 0;
    animation: fadeInUp 1s var(--ease-out) forwards;
    animation-delay: 2.4s;
    transition: color 0.3s ease;
}

.hero-scroll-indicator:hover { color: var(--c-gold); }

.scroll-text {
    font-family: var(--f-mono);
    font-size: 11px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
}

.scroll-arrow {
    animation: scrollBounce 2.4s ease-in-out infinite;
}

@keyframes scrollBounce {
    0%,100% { transform: translateY(0); opacity: 0.7; }
    50%     { transform: translateY(6px); opacity: 1; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(18px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* decorative orbital arc, lower-right of hero */
.hero-arc {
    position: absolute;
    right: -80px;
    bottom: -80px;
    width: 460px;
    height: 460px;
    opacity: 0.55;
    pointer-events: none;
    animation: slowSpin 240s linear infinite;
}

@keyframes slowSpin {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}

/* ------------------------------------------------------------
   Timeline
   ------------------------------------------------------------ */
#timeline-container {
    position: relative;
    z-index: 2;
    max-width: 1280px;
    margin: 0 auto;
    padding: 4rem 2rem 10rem;
}

/* Spine: 2px vertical line at left:33% */
#timeline-spine {
    position: absolute;
    left: var(--spine-x);
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(
        to bottom,
        transparent 0%,
        var(--c-blue) 4%,
        var(--c-blue) 96%,
        transparent 100%
    );
    opacity: 0.75;
    z-index: 1;
}

#timeline-spine::before {
    content: "";
    position: absolute;
    left: -3px;
    top: 0;
    bottom: 0;
    width: 8px;
    background: var(--c-blue);
    filter: blur(6px);
    opacity: 0.25;
}

/* ------------------------------------------------------------
   Epoch row
   ------------------------------------------------------------ */
.epoch {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 2px 2fr;
    column-gap: 0;
    padding: 3.5rem 0 3.5rem;
    min-height: 260px;
}

.epoch::after {
    /* tiny tick marks (oscilloscope graticule) above the marker */
    content: "";
    position: absolute;
    left: calc(var(--spine-x) - 40px);
    top: calc(50% - 14px);
    width: 30px;
    height: 1px;
    background: rgba(59,107,138,0.35);
    box-shadow:
        0 -6px 0 rgba(59,107,138,0.25),
        0 -12px 0 rgba(59,107,138,0.15);
    pointer-events: none;
}

.epoch-marker {
    position: absolute;
    left: var(--spine-x);
    top: 50%;
    transform: translate(-50%, -50%);
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 5;
}

.marker-dot {
    position: absolute;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--c-gold);
    border: 2px solid var(--c-bg);
    box-shadow: 0 0 0 1px rgba(212,168,75,0.4);
    transition: transform 0.35s var(--ease-out);
}

.marker-glow {
    position: absolute;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(212,168,75,0.35) 0%, transparent 65%);
    transform: scale(0.4);
    opacity: 0;
    transition: opacity 0.4s var(--ease-out), transform 0.4s var(--ease-out);
    pointer-events: none;
}

.epoch.visible .marker-glow { opacity: 1; transform: scale(1); }

.epoch.visible .marker-dot { animation: markerPulse 0.45s var(--ease-out) 1; }

@keyframes markerPulse {
    0%   { transform: scale(1); }
    50%  { transform: scale(1.4); }
    100% { transform: scale(1); }
}

.epoch-marker:hover .marker-dot {
    background: var(--c-amber);
    transform: scale(1.25);
}

.marker-tooltip {
    position: absolute;
    left: 30px;
    top: 50%;
    transform: translateY(-50%) translateX(-6px);
    font-family: var(--f-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    color: var(--c-gold);
    background: rgba(10,18,36,0.9);
    padding: 0.3rem 0.55rem;
    border: 1px solid rgba(212,168,75,0.4);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s var(--ease-out);
    text-transform: uppercase;
}

.epoch-marker:hover .marker-tooltip {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
}

/* Connector: horizontal dashed line from spine to panel */
.epoch-connector {
    position: absolute;
    top: 50%;
    height: 1px;
    border-top: 1px dashed var(--c-steel);
    opacity: 0;
    transition: opacity 0.5s var(--ease-out) 0.15s;
    pointer-events: none;
}

.epoch-right .epoch-connector {
    left: var(--spine-x);
    width: calc(38% - 33%);
}

.epoch-left .epoch-connector {
    right: calc(100% - var(--spine-x));
    width: calc(33% - 30%);
}

.epoch.visible .epoch-connector { opacity: 0.9; }

/* Panels — alternating sides */
.epoch-panel {
    position: relative;
    max-width: 520px;
    padding: 1.75rem 2rem;
    background: rgba(22, 34, 54, 0.85);
    box-shadow: 0 2px 24px rgba(10, 18, 36, 0.35);
    border-radius: 2px;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    transition: transform 0.6s var(--ease-out), opacity 0.6s var(--ease-out), box-shadow 0.3s ease;
    opacity: 0;
}

.epoch-right .epoch-panel {
    grid-column: 3;
    justify-self: start;
    margin-left: 4%;
    transform: translateX(40px);
}

.epoch-left .epoch-panel {
    grid-column: 1;
    justify-self: end;
    margin-right: 4%;
    transform: translateX(-40px);
}

.epoch.visible .epoch-panel {
    opacity: 1;
    transform: translateX(0);
}

.epoch-panel:hover {
    box-shadow: 0 4px 30px rgba(10,18,36,0.5), 0 0 0 1px rgba(212,168,75,0.2);
}

/* Left-side (annotation) panels get a lighter weight */
.epoch-left .epoch-panel.panel-annotation {
    background: rgba(22, 34, 54, 0.6);
    font-size: 0.9375rem;
}

/* Parchment-light panel (used sparingly for epoch 05) */
.epoch.panel-parchment .epoch-panel {
    background: var(--c-parchment);
    box-shadow: 0 2px 28px rgba(10,18,36,0.55);
}

.epoch.panel-parchment .panel-title.dark,
.epoch.panel-parchment .panel-body.dark,
.epoch.panel-parchment .panel-lede.dark,
.epoch.panel-parchment .panel-coord.dark {
    color: var(--c-graphite);
}

.epoch.panel-parchment .panel-stamp.dark-stamp span {
    color: var(--c-graphite);
    border-color: rgba(42,47,56,0.25);
    background: rgba(232,226,216,0.5);
}

.epoch.panel-parchment .panel-stamp.dark-stamp span:first-child {
    color: #8a6a20;
    border-color: rgba(138,106,32,0.4);
}

/* Stamp: coordinate-style metadata */
.panel-stamp {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-family: var(--f-mono);
    font-size: 10.5px;
    letter-spacing: 0.16em;
    margin-bottom: 1rem;
    color: var(--c-steel);
}

.panel-stamp span {
    padding: 0.2rem 0.45rem;
    border: 1px solid rgba(90,139,166,0.3);
    background: rgba(10,18,36,0.35);
    text-transform: uppercase;
}

.panel-stamp span:first-child {
    color: var(--c-gold);
    border-color: rgba(212,168,75,0.45);
}

/* readout lines inside panel */
.panel-readouts {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 1.25rem;
}

.readout-line {
    height: 1px;
    background: var(--c-blue);
    opacity: 0.4;
}

.readout-line:nth-child(1) { width: 80%; }
.readout-line:nth-child(2) { width: 55%; }
.readout-line:nth-child(3) { width: 70%; }
.readout-line:nth-child(4) { width: 40%; }

.panel-title {
    font-family: var(--f-display);
    font-weight: 600;
    font-size: clamp(34px, 4.2vw, 54px);
    letter-spacing: -0.02em;
    line-height: 1.05;
    color: var(--c-parchment);
    margin-bottom: 0.6rem;
}

.panel-title-small {
    font-family: var(--f-display);
    font-weight: 300;
    font-size: clamp(26px, 3vw, 34px);
    letter-spacing: -0.015em;
    line-height: 1.2;
    color: var(--c-lunar);
    margin-bottom: 0.9rem;
}

.panel-lede {
    font-family: var(--f-body);
    font-size: 1.125rem;
    font-style: italic;
    color: var(--c-gold);
    margin-bottom: 1rem;
    line-height: 1.55;
}

.panel-body {
    font-family: var(--f-body);
    font-size: 1.0625rem;
    line-height: 1.72;
    color: var(--c-lunar);
    margin-bottom: 1.25rem;
}

.panel-body:last-child { margin-bottom: 0; }

.panel-quote {
    display: flex;
    gap: 0.6rem;
    font-family: var(--f-display);
    font-weight: 300;
    font-size: 1.25rem;
    color: var(--c-amber);
    line-height: 1.4;
    padding: 0.75rem 0;
    border-top: 1px solid rgba(232,147,74,0.2);
    margin-top: 0.5rem;
}

.quote-mark {
    color: var(--c-gold);
    flex-shrink: 0;
}

.panel-micro {
    font-family: var(--f-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    color: var(--c-steel);
    margin-top: 0.75rem;
    text-transform: uppercase;
}

/* data readout block */
.panel-data-readout {
    margin-top: 1.5rem;
    background: rgba(10,18,36,0.55);
    border: 1px solid rgba(59,107,138,0.25);
    padding: 0.85rem 1rem;
}

.data-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.45rem 0;
    border-bottom: 1px solid rgba(59,107,138,0.15);
}

.data-row:last-child { border-bottom: none; }

.data-label {
    font-family: var(--f-mono);
    font-size: 10.5px;
    letter-spacing: 0.18em;
    color: var(--c-steel);
    text-transform: uppercase;
}

.data-value {
    font-family: var(--f-mono);
    font-size: 1rem;
    font-weight: 600;
    color: var(--c-gold);
    text-shadow: 0 0 8px rgba(212,168,75,0.35);
    font-variant-numeric: tabular-nums;
}

/* panel footer with coord + arc */
.panel-footer {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(59,107,138,0.2);
}

.panel-coord {
    font-family: var(--f-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--c-amber);
    text-transform: uppercase;
}

.panel-arc {
    width: 60px;
    height: 60px;
    flex-shrink: 0;
    opacity: 0.9;
}

/* ------------------------------------------------------------
   Footer dissolution field
   ------------------------------------------------------------ */
#terminal-footer {
    position: relative;
    z-index: 2;
    padding: 5rem 2rem 6rem;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.dissolution-field {
    position: relative;
    height: 180px;
    margin-bottom: 3rem;
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    grid-template-rows: repeat(4, 1fr);
    justify-items: center;
    align-items: center;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}

.dissolution-field::before {
    /* the spine dissolving into the field */
    content: "";
    position: absolute;
    left: 50%;
    top: -60px;
    width: 2px;
    height: 60px;
    background: linear-gradient(to bottom, var(--c-blue), transparent);
    transform: translateX(-1px);
}

.d-dot {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--c-blue);
    opacity: 0.65;
    animation: dotFlicker 5s infinite ease-in-out;
}

.d-dot:nth-child(odd)  { background: var(--c-gold); opacity: 0.5; }
.d-dot:nth-child(3n)   { background: var(--c-steel); }
.d-dot:nth-child(4n)   { opacity: 0.3; }
.d-dot:nth-child(5n)   { width: 4px; height: 4px; }
.d-dot:nth-child(7n)   { opacity: 0.8; }

.d-dot:nth-child(1)  { animation-delay: 0s; }
.d-dot:nth-child(2)  { animation-delay: 0.3s; }
.d-dot:nth-child(3)  { animation-delay: 0.6s; }
.d-dot:nth-child(4)  { animation-delay: 0.9s; }
.d-dot:nth-child(5)  { animation-delay: 1.2s; }
.d-dot:nth-child(6)  { animation-delay: 1.5s; }
.d-dot:nth-child(7)  { animation-delay: 1.8s; }
.d-dot:nth-child(8)  { animation-delay: 2.1s; }
.d-dot:nth-child(9)  { animation-delay: 2.4s; }
.d-dot:nth-child(10) { animation-delay: 2.7s; }
.d-dot:nth-child(11) { animation-delay: 3.0s; }
.d-dot:nth-child(12) { animation-delay: 3.3s; }
.d-dot:nth-child(13) { animation-delay: 3.6s; }
.d-dot:nth-child(14) { animation-delay: 3.9s; }
.d-dot:nth-child(15) { animation-delay: 4.2s; }
.d-dot:nth-child(16) { animation-delay: 4.5s; }
.d-dot:nth-child(17) { animation-delay: 4.8s; }
.d-dot:nth-child(18) { animation-delay: 0.15s; }
.d-dot:nth-child(19) { animation-delay: 0.45s; }
.d-dot:nth-child(20) { animation-delay: 0.75s; }
.d-dot:nth-child(21) { animation-delay: 1.05s; }
.d-dot:nth-child(22) { animation-delay: 1.35s; }
.d-dot:nth-child(23) { animation-delay: 1.65s; }
.d-dot:nth-child(24) { animation-delay: 1.95s; }

@keyframes dotFlicker {
    0%,100% { opacity: 0.2; transform: scale(0.9); }
    50%     { opacity: 1; transform: scale(1.2); }
}

.footer-statement {
    font-family: var(--f-display);
    font-weight: 300;
    font-size: clamp(18px, 2.2vw, 24px);
    letter-spacing: 0.02em;
    color: var(--c-lunar);
    margin-bottom: 2rem;
    font-style: italic;
}

.footer-meta {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding-top: 1.25rem;
    border-top: 1px dashed rgba(59,107,138,0.3);
}

.footer-copyright,
.footer-coordinates {
    font-family: var(--f-mono);
    font-size: 10.5px;
    letter-spacing: 0.14em;
    color: var(--c-steel);
    text-transform: uppercase;
}

.footer-coordinates { color: var(--c-blue); }

/* ------------------------------------------------------------
   Selection + scrollbar
   ------------------------------------------------------------ */
::selection {
    background: rgba(212,168,75,0.35);
    color: var(--c-parchment);
}

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--c-bg); }
::-webkit-scrollbar-thumb {
    background: var(--c-blue);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: var(--c-gold); }

/* ------------------------------------------------------------
   Responsive
   ------------------------------------------------------------ */
@media (max-width: 900px) {
    :root { --spine-x: 10%; }

    .instrument-frame {
        font-size: 10px;
        padding: 0.5rem 0.85rem;
        gap: 0.75rem;
    }
    .frame-coords,
    .frame-mode,
    .frame-channel { display: none; }

    #hero { padding: 6rem 1.25rem 4rem; }

    .hero-arc { display: none; }

    #timeline-container {
        padding: 2rem 1rem 8rem;
    }

    .epoch {
        grid-template-columns: 10% 2px 1fr;
        padding: 2rem 0;
    }

    .epoch::after {
        left: calc(var(--spine-x) - 30px);
        width: 22px;
    }

    .epoch-right .epoch-panel,
    .epoch-left .epoch-panel {
        grid-column: 3;
        justify-self: start;
        margin-left: 5%;
        margin-right: 0;
        max-width: 100%;
    }

    .epoch-right .epoch-panel { transform: translateX(25px); }
    .epoch-left .epoch-panel  { transform: translateX(25px); }

    .epoch-left .epoch-connector,
    .epoch-right .epoch-connector {
        left: var(--spine-x);
        right: auto;
        width: 4%;
    }

    .marker-tooltip {
        left: 24px;
        font-size: 10px;
    }

    .footer-meta {
        flex-direction: column;
        text-align: center;
    }

    .hero-title-static {
        font-size: clamp(32px, 9vw, 54px);
    }

    #typewriter-line {
        font-size: 16px;
    }

    .panel-title {
        font-size: clamp(26px, 6vw, 40px);
    }
}

@media (max-width: 500px) {
    body { font-size: 16px; }
    #hero { padding: 5.5rem 1rem 3rem; }
    .panel-stamp { font-size: 9.5px; }
    .panel-body  { font-size: 1rem; }
    .hero-subtitle { font-size: 1rem; }
}