/* =========================================================
   bada.coffee — seapunk HUD-overlay / dive-visor system
   Design language: (Google Fonts, Interaction Pattern (2% frequency),
   Intersection Observer (translate from 20px below to 0), optional grain canvas.
   Intersection Observer reveals trigger fade-translate-up (opacity 0→1).
   ========================================================= */

:root {
    /* Palette — Dopamine Neon Submerged */
    --abyss-black:      #000814;
    --abyss-deeper:     #001a1a;
    --abyss-mid:        #0a1628;
    --bio-cyan:         #00ffc8;
    --phosphor-green:   #4a8a7a;
    --crema-ivory:      #f0e6d2;
    --deep-teal:        #0a3d3d;
    --neon-magenta:     #ff006e;
    --foam-white:       #e0f7f0;
    --steam-gray:       #6b8f8a;
    --body-text:        #b8d8d0;

    /* Timing */
    --ease-rise: cubic-bezier(0.22, 1, 0.36, 1);

    /* Typography */
    --font-display: "Cormorant Garamond", "Cormorant", Georgia, serif;
    --font-body:    "Source Serif 4", "Source Serif Pro", Georgia, serif;
    --font-mono:    "IBM Plex Mono", "Inter", ui-monospace, monospace;
}

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

html, body { width: 100%; overflow-x: hidden; }

html { scroll-behavior: smooth; }

body {
    min-height: 100vh;
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.95rem, 1.1vw, 1.15rem);
    line-height: 1.75;
    color: var(--body-text);
    background-color: var(--abyss-black);
    background-image: linear-gradient(
        180deg,
        var(--abyss-black)   0%,
        var(--abyss-mid)    40%,
        var(--abyss-deeper) 100%
    );
    background-attachment: fixed;
    letter-spacing: 0.01em;
    position: relative;
    overflow-x: hidden;
}

/* ---------- Atmospheric stack (fixed) ---------- */
.atmosphere {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    overflow: hidden;
}

.gradient-depth {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(0, 8, 20, 0.0) 0%,
        rgba(10, 22, 40, 0.55) 45%,
        rgba(0, 26, 26, 0.85) 100%
    );
    mix-blend-mode: multiply;
}

/* Aurora — bioluminescent currents */
.aurora {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.05;
    will-change: transform, opacity;
}

.aurora-1 {
    width: 60vw; height: 60vw;
    top: -10vh; left: -15vw;
    background: radial-gradient(circle, var(--bio-cyan) 0%, transparent 65%);
    opacity: 0.06;
    animation: drift-1 82s ease-in-out infinite alternate;
}

.aurora-2 {
    width: 55vw; height: 55vw;
    top: 35vh; right: -15vw;
    background: radial-gradient(circle, var(--neon-magenta) 0%, transparent 65%);
    opacity: 0.035;
    animation: drift-2 74s ease-in-out infinite alternate;
}

.aurora-3 {
    width: 50vw; height: 50vw;
    bottom: -10vh; left: 15vw;
    background: radial-gradient(circle, var(--bio-cyan) 0%, transparent 65%);
    opacity: 0.045;
    animation: drift-3 90s ease-in-out infinite alternate;
}

.aurora-4 {
    width: 42vw; height: 42vw;
    top: 110vh; right: 20vw;
    background: radial-gradient(circle, var(--deep-teal) 0%, transparent 70%);
    opacity: 0.09;
    animation: drift-4 68s ease-in-out infinite alternate;
}

@keyframes drift-1 {
    0%   { transform: translate3d(0, 0, 0) scale(1); }
    100% { transform: translate3d(12vw, 8vh, 0) scale(1.12); }
}
@keyframes drift-2 {
    0%   { transform: translate3d(0, 0, 0) scale(1); }
    100% { transform: translate3d(-10vw, 14vh, 0) scale(1.18); }
}
@keyframes drift-3 {
    0%   { transform: translate3d(0, 0, 0) scale(1); }
    100% { transform: translate3d(14vw, -10vh, 0) scale(1.1); }
}
@keyframes drift-4 {
    0%   { transform: translate3d(0, 0, 0) scale(1); }
    100% { transform: translate3d(-8vw, -12vh, 0) scale(1.15); }
}

/* Canvas grain */
.grain {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0.07;
    mix-blend-mode: overlay;
    pointer-events: none;
}

/* Vignette — dive visor */
.vignette {
    position: absolute;
    inset: 0;
    background: radial-gradient(
        ellipse at center,
        rgba(0,8,20,0) 40%,
        rgba(0,8,20,0.35) 75%,
        rgba(0,8,20,0.65) 100%
    );
    pointer-events: none;
}

/* =========================================================
   SONAR NAV
   ========================================================= */
.sonar-nav {
    position: fixed;
    top: 2.2rem;
    right: 2.2rem;
    z-index: 50;
    display: flex;
    align-items: flex-start;
    gap: 1.1rem;
}

.sonar-ring {
    width: 60px;
    height: 60px;
    background: transparent;
    border: none;
    padding: 0;
    cursor: pointer;
    position: relative;
    transition: transform 0.5s var(--ease-rise);
}

.sonar-ring svg {
    overflow: visible;
    display: block;
}

.sonar-outline {
    fill: none;
    stroke: var(--bio-cyan);
    stroke-width: 1;
    opacity: 0.55;
    transition: opacity 0.4s var(--ease-rise);
}

.sonar-inner {
    fill: var(--bio-cyan);
    opacity: 0.7;
}

.notch {
    stroke: var(--bio-cyan);
    stroke-width: 1;
    opacity: 0.7;
}

.sonar-pulse {
    fill: none;
    stroke: var(--bio-cyan);
    stroke-width: 1;
    transform-origin: 30px 30px;
    transform: scale(1);
    opacity: 0;
}

.sonar-ring:hover .sonar-outline { opacity: 1; }
.sonar-ring:hover {
    transform: scale(1.15);
}
.sonar-ring:hover .sonar-pulse {
    animation: pulse-out 0.8s var(--ease-rise) 1;
}

.sonar-ring.active .sonar-inner { fill: var(--neon-magenta); }

@keyframes pulse-out {
    0%   { transform: scale(1);   opacity: 1; }
    100% { transform: scale(1.4); opacity: 0; }
}

.sonar-labels {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    max-width: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-width 0.6s var(--ease-rise), opacity 0.4s var(--ease-rise);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 300;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--phosphor-green);
    padding-top: 0.4rem;
}

.sonar-nav:hover .sonar-labels,
.sonar-nav:focus-within .sonar-labels {
    max-width: 220px;
    opacity: 1;
}

.sonar-link {
    color: inherit;
    text-decoration: none;
    position: relative;
    padding: 0.1rem 0;
    display: inline-block;
    transition: color 0.3s var(--ease-rise);
}

.sonar-link::before {
    content: attr(data-depth) "  ";
    color: var(--bio-cyan);
    opacity: 0.55;
    margin-right: 0.3em;
}

.sonar-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -1px;
    height: 1px;
    width: 100%;
    background: var(--bio-cyan);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 0.4s var(--ease-rise);
}

.sonar-link:hover { color: var(--foam-white); }
.sonar-link:hover::after { transform: scaleX(1); }

/* =========================================================
   HUD READOUT (top-left)
   ========================================================= */
.hud-readout {
    position: fixed;
    top: 2.2rem;
    left: 2.2rem;
    z-index: 40;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 300;
    color: var(--phosphor-green);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    opacity: 0.78;
    pointer-events: none;
    max-width: 40vw;
}

.hud-line em {
    font-style: normal;
    color: var(--bio-cyan);
    opacity: 0.55;
    margin-right: 0.6em;
}

.hud-sep { color: var(--steam-gray); opacity: 0.6; }

/* =========================================================
   DESCENT / ZONES
   ========================================================= */
.descent {
    position: relative;
    z-index: 1;
}

.zone {
    position: relative;
    width: 100%;
    padding: 8rem 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* Depth marker (small HUD breadcrumb per zone) */
.depth-marker {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 300;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--phosphor-green);
    margin-bottom: 2.4rem;
    max-width: 88vw;
}

.gauge {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 1px solid var(--bio-cyan);
    border-radius: 50%;
    position: relative;
    opacity: 0.75;
    flex-shrink: 0;
}
.gauge::before {
    content: "";
    position: absolute;
    inset: 4px;
    border-radius: 50%;
    border: 1px dashed var(--phosphor-green);
    opacity: 0.6;
    animation: gauge-spin 22s linear infinite;
}
@keyframes gauge-spin {
    to { transform: rotate(360deg); }
}

.coord { color: var(--foam-white); opacity: 0.85; letter-spacing: 0.2em; }

.dashline {
    flex: 1;
    height: 1px;
    border-top: 1px dashed var(--phosphor-green);
    opacity: 0.35;
    min-width: 40px;
    max-width: 320px;
}

.depth-label { color: var(--bio-cyan); opacity: 0.75; }

/* Zone header (shared) */
.zone-header {
    display: flex;
    align-items: baseline;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.zone-header h2 {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(1.4rem, 3vw, 2.8rem);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--foam-white);
    line-height: 1;
}

.header-index {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 300;
    letter-spacing: 0.2em;
    color: var(--bio-cyan);
    opacity: 0.7;
}

.header-divider {
    flex: 1;
    height: 1px;
    background: linear-gradient(
        90deg,
        rgba(0,255,200,0.35) 0%,
        rgba(74,138,122,0.12) 100%
    );
    min-width: 40px;
    max-width: 280px;
}

/* =========================================================
   ZONE 1 — SURFACE / HERO
   ========================================================= */
.zone-surface {
    align-items: flex-start;
    justify-content: center;
    padding-top: 10rem;
    min-height: 100vh;
    position: relative;
}

.hero-word {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(15vw, 20vw, 30vw);
    line-height: 0.9;
    color: transparent;
    background-color: rgba(0, 255, 200, 0.7);
    -webkit-background-clip: text;
    background-clip: text;
    opacity: 0.72;
    margin-left: -0.04em;
    margin-top: 1rem;
    text-shadow:
        0 0 40px rgba(0, 255, 200, 0.15),
        0 0 120px rgba(0, 255, 200, 0.08);
    letter-spacing: -0.02em;
    position: relative;
}

.hero-letters {
    display: inline-flex;
    gap: 0.02em;
}

.hl {
    display: inline-block;
    position: relative;
    transition: transform 0.9s var(--ease-rise),
                color 0.6s var(--ease-rise),
                text-shadow 0.6s var(--ease-rise);
}

.hero-word:hover .hl {
    color: var(--foam-white);
    text-shadow:
        0 0 60px rgba(0, 255, 200, 0.35),
        0 0 140px rgba(255, 0, 110, 0.12);
}

.hl:hover {
    transform: translateY(-0.04em);
}

.hero-sub {
    font-family: var(--font-display);
    font-weight: 400;
    font-variant: small-caps;
    font-size: clamp(0.95rem, 1.2vw, 1.1rem);
    letter-spacing: 0.5em;
    color: var(--foam-white);
    opacity: 0.85;
    margin-top: 1rem;
    margin-left: 0.3rem;
}

.hero-tag {
    font-family: var(--font-body);
    font-style: italic;
    font-size: clamp(0.9rem, 1.05vw, 1.05rem);
    line-height: 1.7;
    color: var(--body-text);
    opacity: 0.75;
    max-width: 520px;
    margin-top: 2.2rem;
    margin-left: 0.4rem;
    letter-spacing: 0.02em;
}

.hero-scroll {
    position: absolute;
    bottom: 4rem;
    left: 2.2rem;
    display: flex;
    align-items: center;
    gap: 0.9rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 300;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--phosphor-green);
}

.scroll-line {
    display: inline-block;
    width: 80px;
    height: 1px;
    background: var(--bio-cyan);
    opacity: 0.6;
    position: relative;
    overflow: hidden;
}
.scroll-line::after {
    content: "";
    position: absolute;
    top: 0; left: -40%;
    height: 100%;
    width: 40%;
    background: var(--foam-white);
    animation: scroll-run 2.6s var(--ease-rise) infinite;
}
@keyframes scroll-run {
    0%   { left: -40%; opacity: 0.8; }
    100% { left: 110%; opacity: 0; }
}

/* =========================================================
   ZONE 2 — SHALLOW / ORIGIN
   ========================================================= */
.zone-shallow {
    align-items: flex-start;
    padding-left: 8vw;
}

.data-block {
    max-width: 440px;
    padding: 2rem 2rem 2.2rem;
    background: rgba(10, 22, 40, 0.55);
    border: 1px solid rgba(0, 255, 200, 0.2);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    position: relative;
}

.data-block::before,
.data-block::after {
    content: "";
    position: absolute;
    width: 12px;
    height: 12px;
    border: 1px solid var(--bio-cyan);
    opacity: 0.55;
}
.data-block::before {
    top: -1px; left: -1px;
    border-right: none; border-bottom: none;
}
.data-block::after {
    bottom: -1px; right: -1px;
    border-left: none; border-top: none;
}

/* Fallback for no-backdrop-filter */
@supports not (backdrop-filter: blur(8px)) {
    .data-block { background: rgba(10, 22, 40, 0.92); }
}

.readout-line {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.95rem, 1.05vw, 1.08rem);
    line-height: 1.8;
    color: var(--body-text);
    margin-bottom: 1.3rem;
    position: relative;
}

.readout-line:last-child { margin-bottom: 0; }

.coord-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 0.7rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--phosphor-green);
    margin-right: 0.5em;
}

.readout-dim {
    color: var(--steam-gray);
    font-style: italic;
    opacity: 0.85;
    border-left: 1px dashed var(--phosphor-green);
    padding-left: 1rem;
    margin-left: -0.2rem;
}

/* =========================================================
   ZONE 3 — DEEP / PROCESS TIMELINE
   ========================================================= */
.zone-deep {
    align-items: stretch;
    padding-left: 4rem;
    padding-right: 4rem;
    min-height: 110vh;
}

.process-intro {
    max-width: 620px;
    font-style: italic;
    font-size: clamp(0.95rem, 1.1vw, 1.1rem);
    color: var(--body-text);
    opacity: 0.88;
    margin-bottom: 3rem;
    letter-spacing: 0.01em;
}

.timeline {
    position: relative;
    width: 100%;
    min-height: 40vh;
    margin: 2rem 0 3rem;
}

.timeline-rail {
    position: absolute;
    left: 0;
    right: 0;
    top: 48px;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(0,255,200,0.35) 8%,
        rgba(0,255,200,0.35) 92%,
        transparent 100%
    );
}

.rail-dash {
    display: block;
    position: absolute;
    top: -1px;
    left: 0;
    right: 0;
    height: 3px;
    background-image: linear-gradient(90deg, var(--bio-cyan) 50%, transparent 50%);
    background-size: 12px 3px;
    background-repeat: repeat-x;
    opacity: 0.35;
    animation: rail-dash-move 6s linear infinite;
}

@keyframes rail-dash-move {
    from { background-position: 0 0; }
    to   { background-position: -120px 0; }
}

.timeline-track {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 1.5rem;
    position: relative;
}

.t-node {
    position: relative;
    padding-top: 72px;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.t-dot {
    position: absolute;
    top: 40px;
    left: 0;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--abyss-black);
    border: 1px solid var(--bio-cyan);
    box-shadow:
        0 0 12px rgba(0, 255, 200, 0.5),
        0 0 32px rgba(0, 255, 200, 0.15),
        inset 0 0 4px rgba(0, 255, 200, 0.4);
}

.t-node.in-view .t-dot {
    animation: node-bloom 1.2s var(--ease-rise) forwards;
}

@keyframes node-bloom {
    0%   { transform: scale(0.6); box-shadow: 0 0 0 rgba(0,255,200,0); }
    50%  { transform: scale(1.2); box-shadow: 0 0 18px rgba(0,255,200,0.85),
                                              0 0 40px rgba(0,255,200,0.25); }
    100% { transform: scale(1);   box-shadow: 0 0 12px rgba(0,255,200,0.5),
                                              0 0 32px rgba(0,255,200,0.15); }
}

.t-index {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 300;
    letter-spacing: 0.2em;
    color: var(--bio-cyan);
    opacity: 0.75;
}

.t-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(1.05rem, 1.4vw, 1.35rem);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--foam-white);
    line-height: 1.1;
    margin-top: 0.2rem;
}

.t-meta {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 0.66rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--phosphor-green);
    opacity: 0.9;
}

.t-note {
    font-family: var(--font-body);
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--body-text);
    opacity: 0.8;
    margin-top: 0.3rem;
    font-style: italic;
    max-width: 22ch;
}

.process-footnote {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 300;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--phosphor-green);
    opacity: 0.75;
    margin-top: 1.5rem;
}

/* =========================================================
   ZONE 4 — ABYSS
   ========================================================= */
.zone-abyss {
    min-height: 110vh;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: radial-gradient(
        ellipse at center,
        rgba(0, 8, 20, 0.4) 0%,
        rgba(0, 8, 20, 0.85) 80%
    );
}

.zone-abyss .depth-marker {
    justify-content: center;
    margin-bottom: 6rem;
}

.abyss-lone {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    max-width: 720px;
    margin: 0 auto;
    padding: 2rem;
}

.abyss-prelude {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 300;
    letter-spacing: 0.35em;
    text-transform: uppercase;
    color: var(--phosphor-green);
    opacity: 0.75;
}

.abyss-beacon {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(1.8rem, 5vw, 3.6rem);
    letter-spacing: 0.04em;
    color: var(--bio-cyan);
    text-decoration: none;
    position: relative;
    padding: 0.4rem 0.3rem;
    display: inline-block;
    animation: beacon-pulse 3.4s ease-in-out infinite;
    transition: color 0.5s var(--ease-rise), letter-spacing 0.6s var(--ease-rise);
}

@keyframes beacon-pulse {
    0%, 100% {
        text-shadow:
            0 0 20px rgba(0, 255, 200, 0.25),
            0 0 60px rgba(0, 255, 200, 0.08);
        opacity: 0.85;
    }
    50% {
        text-shadow:
            0 0 40px rgba(0, 255, 200, 0.55),
            0 0 120px rgba(0, 255, 200, 0.2);
        opacity: 1;
    }
}

.abyss-beacon::after {
    content: "";
    position: absolute;
    left: 0.3rem;
    right: 0.3rem;
    bottom: 0.3rem;
    height: 1px;
    background: var(--bio-cyan);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 0.8s var(--ease-rise);
}
.abyss-beacon.revealed::after { transform: scaleX(1); }
.abyss-beacon:hover {
    color: var(--foam-white);
    letter-spacing: 0.06em;
}

.abyss-coords {
    display: flex;
    align-items: center;
    gap: 1.1rem;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 300;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--phosphor-green);
    opacity: 0.85;
    margin-top: 1rem;
}

.abyss-sep {
    display: inline-block;
    width: 40px;
    height: 1px;
    border-top: 1px dashed var(--phosphor-green);
    opacity: 0.55;
}

.abyss-sig {
    margin-top: 4rem;
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.85rem;
    color: var(--steam-gray);
    opacity: 0.65;
    max-width: 540px;
    line-height: 1.75;
}

/* =========================================================
   SONAR PULSE RINGS — section transition motif
   ========================================================= */
.sonar-pulse-ring {
    position: absolute;
    width: 420px;
    height: 420px;
    border-radius: 50%;
    border: 0.5px solid var(--bio-cyan);
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, -50%) scale(0.5);
    left: 50%;
    top: 50%;
    z-index: 0;
}

.sonar-pulse-ring.pulse-hero    { top: 46%; left: 70%; }
.sonar-pulse-ring.pulse-shallow { top: 50%; left: 85%; }
.sonar-pulse-ring.pulse-deep    { top: 38%; left: 12%; width: 320px; height: 320px; }
.zone.in-view .sonar-pulse-ring {
    animation: sonar-ping 4.2s var(--ease-rise) 1;
}

@keyframes sonar-ping {
    0%   { opacity: 0.12; transform: translate(-50%, -50%) scale(0.5); }
    85%  { opacity: 0.02; }
    100% { opacity: 0;    transform: translate(-50%, -50%) scale(2); }
}

/* =========================================================
   REVEAL ANIMATION
   ========================================================= */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s var(--ease-rise),
                transform 0.6s var(--ease-rise);
    will-change: opacity, transform;
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Origin data-block readout-lines — slight stagger via scroll */
.readout-line.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 900px) {
    .hud-readout { font-size: 0.6rem; max-width: 55vw; }
    .sonar-nav { top: 1.4rem; right: 1.4rem; }

    .zone { padding: 6rem 1.4rem; }
    .zone-shallow { padding-left: 1.4rem; }
    .zone-deep { padding-left: 1.4rem; padding-right: 1.4rem; }

    .timeline-track {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    .timeline-rail { display: none; }

    .t-node { padding-top: 36px; padding-left: 30px; }
    .t-dot  { top: 8px; left: 0; }

    .hero-sub { letter-spacing: 0.35em; }
    .hero-tag { font-size: 0.95rem; }

    .abyss-coords { flex-direction: column; gap: 0.5rem; }
    .abyss-sep { display: none; }
}

@media (max-width: 600px) {
    .hud-readout { display: none; }
    .sonar-nav { top: 1rem; right: 1rem; }
    .sonar-ring { width: 44px; height: 44px; }
    .sonar-ring svg { width: 44px; height: 44px; }
    .hero-scroll { left: 1.4rem; bottom: 2rem; }
    .data-block { padding: 1.4rem; }
    .depth-marker { flex-wrap: wrap; gap: 0.5rem; }
    .dashline { min-width: 24px; max-width: 80px; }
}