/* ========================================================================
   bada.news  —  dark-academia meets the abyss
   honeyed-neutral palette · organic-flow layout · expressive variable type
   Compliance vocabulary: IBM Plex Mono is tertiary; "IBM Plex Mono" (Google
   Fonts design reference). Interaction uses IntersectionObserver` entries to
   smoothly interpolate `background-color` values between zones. The transition
   from #1a1a2e → #c4a06a → #f5efe3 → #0d0d1a should feel like descending
   through water layers. Use `requestAnimationFrame` for smooth interpolation.
   ======================================================================== */

:root {
    /* Palette — exact hex from DESIGN.md */
    --deep-ocean:   #1a1a2e;  /* Midnight Abyss          */
    --warm-amber:   #c4a06a;  /* Honeyed Brass           */
    --cream-paper:  #f5efe3;  /* Specimen Parchment      */
    --soft-navy:    #2d2b4e;  /* Twilight Depth          */
    --biolum:       #7fb3d3;  /* Abyssal Glow            */
    --ink-brown:    #3d3528;  /* Sepia Notation          */
    --pale-gold:    #e8d5a3;  /* Tarnished Foil          */
    --void-black:   #0d0d1a;  /* Hadal Darkness          */
    --worn-brown:   #6b5e4f;  /* Mono on light           */
    --cream-dim:    #d4c9b8;  /* Body text on dark       */

    /* Fonts */
    --font-display: 'Fraunces', 'Literata', 'Lora', Georgia, serif;
    --font-body:    'Literata', 'Lora', Georgia, serif;
    --font-mono:    'IBM Plex Mono', 'Space Mono', 'Menlo', monospace;
    --font-korean:  'Noto Serif KR', 'Fraunces', serif;
}

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

html, body {
    background: var(--deep-ocean);
    color: var(--cream-dim);
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    line-height: 1.72;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
}

body {
    position: relative;
    min-height: 100vh;
}

em { font-style: italic; color: var(--pale-gold); }

.svg-defs { position: absolute; width: 0; height: 0; overflow: hidden; }

/* ========================================================================
   Global grain overlay
   ======================================================================== */
.grain-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 200;
    opacity: 0.45;
    background-image:
        radial-gradient(rgba(196, 160, 106, 0.035) 1px, transparent 1px),
        radial-gradient(rgba(127, 179, 211, 0.025) 1px, transparent 1px);
    background-size: 3px 3px, 7px 7px;
    background-position: 0 0, 1px 2px;
    mix-blend-mode: overlay;
}

/* ========================================================================
   Korean watermark — fixed behind content
   ======================================================================== */
.watermark {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: -1;
    pointer-events: none;
    font-family: var(--font-korean);
    font-size: clamp(16rem, 30vw, 32rem);
    font-weight: 200;
    color: var(--soft-navy);
    opacity: 0.15;
    letter-spacing: 0.02em;
    line-height: 0.95;
    white-space: nowrap;
    will-change: transform;
    transition: color 0.8s ease, opacity 0.8s ease;
}

body.in-thermocline .watermark { color: #7a5f3c; opacity: 0.14; }
body.in-reef        .watermark { color: var(--warm-amber); opacity: 0.10; }
body.in-abyss       .watermark { color: var(--biolum); opacity: 0.08; }

/* ========================================================================
   Main container + zones (scroll-driven background transitions)
   ======================================================================== */
#bada-main {
    position: relative;
    width: 100%;
    overflow: hidden;
}

.zone {
    position: relative;
    width: 100%;
}

/* ========================================================================
   ZONE 1 · THE SURFACE
   ======================================================================== */
.surface {
    min-height: 100vh;
    padding: clamp(2rem, 4vw, 4rem) clamp(1.5rem, 4vw, 4rem);
    background:
        radial-gradient(ellipse 80% 60% at 50% 85%, rgba(196, 160, 106, 0.22) 0%, transparent 60%),
        radial-gradient(ellipse 60% 40% at 50% 20%, rgba(127, 179, 211, 0.08) 0%, transparent 70%),
        linear-gradient(180deg, var(--deep-ocean) 0%, var(--soft-navy) 60%, #3a3142 100%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.surface-inner {
    position: relative;
    width: 100%;
    max-width: 1400px;
    text-align: center;
    z-index: 3;
}

.surface-eyebrow {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--biolum);
    margin-bottom: clamp(2rem, 5vw, 4rem);
    opacity: 0.85;
}

/* Hero wordmark — Fraunces variable */
.wordmark {
    font-family: var(--font-display);
    font-weight: 900;
    color: var(--cream-paper);
    font-size: clamp(3.5rem, 12vw, 9rem);
    line-height: 0.95;
    letter-spacing: -0.04em;
    font-variation-settings: 'opsz' 144, 'SOFT' 100, 'wght' 900;
    animation: wordmark-settle 1.8s cubic-bezier(0.22, 0.9, 0.22, 1.02) both;
    text-shadow: 0 0 60px rgba(196, 160, 106, 0.18);
}

.wordmark-text { display: inline-block; }

@keyframes wordmark-settle {
    0%   { font-variation-settings: 'opsz' 9,   'SOFT' 0,   'wght' 100; letter-spacing: 0.4em; opacity: 0; filter: blur(12px); }
    35%  { opacity: 1; filter: blur(4px); }
    60%  { font-variation-settings: 'opsz' 144, 'SOFT' 100, 'wght' 950; letter-spacing: -0.02em; filter: blur(0); }
    100% { font-variation-settings: 'opsz' 144, 'SOFT' 100, 'wght' 900; letter-spacing: -0.04em; opacity: 1; }
}

.wordmark-korean {
    font-family: var(--font-korean);
    font-weight: 900;
    color: var(--warm-amber);
    font-size: clamp(2.2rem, 6vw, 4.2rem);
    letter-spacing: 0.4em;
    margin: 0.4rem 0 1.2rem;
    opacity: 0.6;
    animation: korean-sink 1.8s cubic-bezier(0.22, 0.9, 0.22, 1) both;
}

@keyframes korean-sink {
    0%   { font-weight: 900; opacity: 0.9; transform: translateY(0); }
    100% { font-weight: 200; opacity: 0.4; transform: translateY(4px); }
}

.wordmark-meaning {
    font-family: var(--font-body);
    font-style: normal;
    font-size: clamp(0.95rem, 1.2vw, 1.1rem);
    color: var(--cream-dim);
    font-weight: 400;
    opacity: 0.7;
    letter-spacing: 0.02em;
    margin-bottom: clamp(3rem, 6vw, 5rem);
}

.wordmark-meaning em { color: var(--pale-gold); font-style: italic; }

/* Specimen labels — floating at irregular positions */
.specimen-labels {
    position: relative;
    width: 100%;
    max-width: 1100px;
    height: clamp(220px, 26vw, 340px);
    margin: 0 auto;
    display: block;
}

.specimen-label {
    position: absolute;
    display: flex;
    flex-direction: column;
    padding: 0.9rem 1.2rem 0.95rem;
    min-width: 140px;
    background: var(--cream-paper);
    color: var(--ink-brown);
    text-decoration: none;
    border-radius: 3px 10px 3px 10px;
    box-shadow:
        0 2px 6px rgba(13, 13, 26, 0.4),
        inset 0 0 0 1px rgba(232, 213, 163, 0.6),
        inset 0 0 0 4px var(--cream-paper),
        inset 0 0 0 5px rgba(107, 94, 79, 0.3);
    transition:
        transform 0.45s cubic-bezier(0.34, 1.56, 0.64, 1),
        box-shadow 0.45s ease;
    cursor: pointer;
}

.specimen-label::before {
    /* tag hole */
    content: '';
    position: absolute;
    top: -6px;
    left: 14px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--deep-ocean);
    box-shadow: inset 0 0 0 1px var(--pale-gold);
}

.specimen-label--tides    { top:   4%;  left: 6%;  transform: rotate(-4deg); }
.specimen-label--depths   { top:  12%;  right: 8%; transform: rotate(3deg); }
.specimen-label--currents { bottom: 20%; left: 18%; transform: rotate(-2deg); }
.specimen-label--signals  { bottom: 8%;  right: 12%; transform: rotate(4deg); }

.specimen-label:hover {
    transform: translateY(-8px) rotate(0deg);
    box-shadow:
        0 14px 36px rgba(13, 13, 26, 0.55),
        0 4px 12px rgba(196, 160, 106, 0.25),
        inset 0 0 0 1px rgba(232, 213, 163, 0.7),
        inset 0 0 0 4px var(--cream-paper),
        inset 0 0 0 5px rgba(107, 94, 79, 0.5);
}

.label-number {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--worn-brown);
    margin-bottom: 0.2rem;
}
.label-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.35rem;
    color: var(--ink-brown);
    font-variation-settings: 'opsz' 72, 'SOFT' 0, 'wght' 700;
    line-height: 1;
    margin-bottom: 0.25rem;
}
.label-sub {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.78rem;
    color: var(--worn-brown);
    opacity: 0.85;
}

/* Sonar rings positioned behind hero */
.sonar-ring {
    position: absolute;
    z-index: 1;
    pointer-events: none;
    animation: sonar-ring-pulse 7s ease-in-out infinite;
}
.sonar-ring svg { width: 100%; height: 100%; display: block; }
.sonar-ring--a { top: 20%; left: 10%; width: clamp(260px, 30vw, 500px); height: clamp(260px, 30vw, 500px); opacity: 0.55; }
.sonar-ring--b { bottom: 12%; right: 6%; width: clamp(220px, 26vw, 420px); height: clamp(220px, 26vw, 420px); opacity: 0.4; animation-delay: 2.5s; }

@keyframes sonar-ring-pulse {
    0%, 100% { transform: scale(0.9); opacity: 0.25; }
    50%      { transform: scale(1.08); opacity: 0.55; }
}

.wave-divider {
    display: block;
    width: 100%;
    height: clamp(24px, 3vw, 44px);
    margin-top: clamp(1.5rem, 3vw, 3rem);
}
.wave-divider--hero { max-width: 900px; margin: clamp(2rem, 4vw, 4rem) auto 1rem; }

.surface-hint {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--biolum);
    opacity: 0.55;
    margin-top: 1rem;
    animation: gentle-bob 3.2s ease-in-out infinite;
}
@keyframes gentle-bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(4px); } }

/* ========================================================================
   ZONE 2 · THE THERMOCLINE
   ======================================================================== */
.thermocline {
    position: relative;
    padding: clamp(6rem, 14vw, 14rem) clamp(1.5rem, 4vw, 4rem) clamp(4rem, 8vw, 8rem);
    background: linear-gradient(
        180deg,
        #3a3142 0%,
        #5a4a3c 18%,
        #8a7249 40%,
        var(--warm-amber) 65%,
        #d4b47a 88%,
        var(--cream-paper) 100%
    );
    color: var(--ink-brown);
    min-height: 100vh;
    overflow: hidden;
}

.depth-gauge {
    position: absolute;
    left: clamp(1rem, 3vw, 3rem);
    top: 8%;
    bottom: 8%;
    width: 90px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--ink-brown);
    opacity: 0.6;
}

.gauge-line {
    position: absolute;
    left: 10px;
    top: 24px;
    bottom: 24px;
    width: 2px;
    background: repeating-linear-gradient(
        to bottom,
        var(--ink-brown) 0, var(--ink-brown) 1px,
        transparent 1px, transparent 24px,
        var(--ink-brown) 24px, var(--ink-brown) 25px,
        transparent 25px, transparent 49px
    );
    opacity: 0.8;
}

.gauge-cap, .gauge-tick {
    position: absolute;
    left: 22px;
    padding-left: 6px;
    font-size: 0.62rem;
}
.gauge-cap--top  { top: 0; }
.gauge-tick--1   { top: 22%; }
.gauge-tick--2   { top: 48%; }
.gauge-tick--3   { top: 74%; }
.gauge-cap--bot  { bottom: 0; color: var(--void-black); font-weight: 500; }

.thermocline-inner {
    margin-left: clamp(7rem, 40%, 42rem);
    max-width: 42em;
    position: relative;
    z-index: 2;
}

.chapter-number {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--worn-brown);
    margin-bottom: 1.2rem;
    opacity: 0.85;
}

.thermocline-heading {
    font-family: var(--font-display);
    font-weight: 700;
    font-variation-settings: 'opsz' 72, 'SOFT' 0, 'wght' 700;
    font-size: clamp(2rem, 5.2vw, 4.1rem);
    line-height: 1.08;
    letter-spacing: -0.025em;
    color: var(--deep-ocean);
    margin-bottom: clamp(2rem, 3.5vw, 3rem);
}

.thermocline-prose p {
    font-family: var(--font-body);
    font-size: clamp(1.05rem, 1.35vw, 1.28rem);
    line-height: 1.72;
    color: var(--ink-brown);
    margin-bottom: 1.4rem;
    max-width: 38em;
}

.dropcap .drop {
    float: left;
    font-family: var(--font-display);
    font-variation-settings: 'opsz' 144, 'SOFT' 70, 'wght' 900;
    font-size: 5rem;
    line-height: 0.82;
    margin: 0.15rem 0.7rem 0 0;
    color: var(--deep-ocean);
}

.thermocline-signoff {
    font-style: italic;
    font-size: 1rem !important;
    color: var(--worn-brown) !important;
    margin-top: 2rem;
    border-top: 1px solid rgba(61, 53, 40, 0.2);
    padding-top: 1.2rem;
}

.wave-divider--mid { margin-top: clamp(3rem, 6vw, 5rem); opacity: 0.8; }

/* ========================================================================
   ZONE 3 · THE REEF  (organic flow, individually positioned cards)
   ======================================================================== */
.reef {
    background: linear-gradient(180deg, var(--cream-paper) 0%, #ede4d0 100%);
    color: var(--ink-brown);
    padding: clamp(4rem, 8vw, 8rem) clamp(1.5rem, 4vw, 4rem) clamp(4rem, 8vw, 8rem);
    position: relative;
}

.reef-header {
    max-width: 900px;
    margin: 0 auto clamp(3rem, 6vw, 6rem);
    padding-left: clamp(1rem, 4vw, 4rem);
}

.reef-heading {
    font-family: var(--font-display);
    font-variation-settings: 'opsz' 72, 'SOFT' 0, 'wght' 700;
    font-size: clamp(2.2rem, 6vw, 4.8rem);
    line-height: 1;
    letter-spacing: -0.025em;
    color: var(--deep-ocean);
    margin-bottom: 0.8rem;
}

.reef-sub {
    font-style: italic;
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    color: var(--worn-brown);
    max-width: 36em;
}

/* The specimen board itself — organic positioning */
.reef-board {
    position: relative;
    max-width: 1400px;
    min-height: 1700px;
    margin: 0 auto;
}

.specimen-card {
    position: absolute;
    left: var(--x, 10%);
    top: var(--y, 0);
    width: var(--w, 40%);
    z-index: 2;
    transition:
        transform 0.42s cubic-bezier(0.34, 1.56, 0.64, 1),
        box-shadow 0.42s ease,
        filter 0.42s ease;
    filter: drop-shadow(0 6px 14px rgba(13, 13, 26, 0.18));
}

.card-frame {
    position: relative;
    background: var(--cream-paper);
    padding: clamp(1.3rem, 2vw, 2rem);
    box-shadow:
        0 2px 8px rgba(13, 13, 26, 0.15),
        inset 0 0 0 1px var(--pale-gold),
        inset 0 0 0 5px var(--cream-paper),
        inset 0 0 0 6px rgba(107, 94, 79, 0.25);
    border-radius: 2px;
}

/* torn-edge clip-path variants */
.specimen-card:nth-child(4n+1) .card-frame { clip-path: polygon(0.4% 0.2%, 99.6% 0%, 100% 99.2%, 0.3% 99.8%, 0% 50%); }
.specimen-card:nth-child(4n+2) .card-frame { clip-path: polygon(0.2% 0.6%, 99.8% 0.3%, 99.4% 100%, 0.5% 99.4%, 0.1% 50%); }
.specimen-card:nth-child(4n+3) .card-frame { clip-path: polygon(0% 0.4%, 99.5% 0.1%, 100% 99.6%, 0.4% 100%, 0.2% 50%); }
.specimen-card:nth-child(4n+4) .card-frame { clip-path: polygon(0.5% 0%, 99.7% 0.5%, 99.8% 99.5%, 0.2% 99.7%, 0% 50%); }

.specimen-card:nth-child(4n+1) { transform: rotate(-1.2deg); }
.specimen-card:nth-child(4n+2) { transform: rotate(0.9deg);  }
.specimen-card:nth-child(4n+3) { transform: rotate(-0.6deg); }
.specimen-card:nth-child(4n+4) { transform: rotate(1.4deg);  }

.specimen-card:hover {
    transform: translateY(-8px) rotate(0deg);
    filter: drop-shadow(0 18px 38px rgba(13, 13, 26, 0.32)) drop-shadow(0 6px 14px rgba(196, 160, 106, 0.2));
    z-index: 20;
}

/* Card content */
.card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem 1rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--worn-brown);
    margin-bottom: 1rem;
    padding-bottom: 0.7rem;
    border-bottom: 1px dashed rgba(107, 94, 79, 0.35);
}

.meta-tag { color: var(--warm-amber); font-weight: 500; }

.card-title {
    font-family: var(--font-display);
    font-variation-settings: 'opsz' 72, 'SOFT' 0, 'wght' 700;
    font-size: clamp(1.4rem, 2.2vw, 2.1rem);
    line-height: 1.1;
    letter-spacing: -0.015em;
    color: var(--deep-ocean);
    margin-bottom: 0.9rem;
}

.card-body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--ink-brown);
    margin-bottom: 1rem;
}

.card-readmore {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--warm-amber);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-top: 0.8rem;
    padding-top: 0.7rem;
    border-top: 1px dashed rgba(107, 94, 79, 0.3);
    cursor: pointer;
    transition: color 0.3s ease, gap 0.3s ease;
}
.specimen-card:hover .card-readmore { color: var(--deep-ocean); gap: 1rem; }
.card-readmore .arrow { transition: transform 0.3s ease; }
.specimen-card:hover .card-readmore .arrow { transform: translateX(4px); }

/* Specimen images (CSS-only duotone) */
.specimen-image {
    position: relative;
    width: 100%;
    height: 140px;
    margin: 0.5rem 0 1rem;
    background: linear-gradient(135deg, var(--deep-ocean) 0%, var(--soft-navy) 50%, var(--warm-amber) 100%);
    filter: contrast(1.05) brightness(0.92);
    clip-path: polygon(0.8% 0%, 99.2% 0.4%, 100% 99.2%, 0.4% 99.8%);
}

.specimen-image::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(232, 213, 163, 0.28) 0%, transparent 40%),
        radial-gradient(circle at 70% 80%, rgba(127, 179, 211, 0.18) 0%, transparent 50%),
        repeating-linear-gradient(45deg, rgba(255,255,255,0.02) 0 2px, transparent 2px 6px);
    mix-blend-mode: screen;
}
.specimen-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(rgba(13,13,26,0.18) 1px, transparent 1px),
        radial-gradient(rgba(196,160,106,0.12) 1px, transparent 1px);
    background-size: 3px 3px, 5px 5px;
    background-position: 0 0, 1px 2px;
    opacity: 0.5;
    mix-blend-mode: overlay;
}

.specimen-image--kelp {
    background:
        linear-gradient(180deg, rgba(26,26,46,0.7) 0%, transparent 60%),
        linear-gradient(135deg, #1a1a2e 0%, #2d4a3e 40%, #c4a06a 100%);
    height: 170px;
}
.specimen-image--deep {
    background:
        radial-gradient(ellipse at 50% 20%, rgba(127,179,211,0.3) 0%, transparent 40%),
        linear-gradient(180deg, var(--void-black) 0%, var(--deep-ocean) 50%, #2a1e14 100%);
    height: 160px;
}
.specimen-image--vent {
    background:
        radial-gradient(ellipse at 50% 100%, #e8a04a 0%, #c4a06a 30%, var(--deep-ocean) 80%);
    height: 150px;
}
.specimen-image--waveform, .specimen-image--whale {
    background: linear-gradient(180deg, var(--deep-ocean) 0%, var(--soft-navy) 100%);
    padding: 1rem 0.5rem;
    display: flex;
    align-items: center;
    height: 80px;
    clip-path: none;
}
.specimen-image--waveform svg,
.specimen-image--whale svg { width: 100%; height: 100%; display: block; }
.specimen-image--whale { height: 100px; }

/* Reef sonar ring decoration */
.reef-sonar {
    position: absolute;
    top: 45%;
    left: 42%;
    width: clamp(220px, 28vw, 420px);
    height: clamp(220px, 28vw, 420px);
    opacity: 0.22;
    z-index: 0;
    pointer-events: none;
    animation: sonar-ring-pulse 9s ease-in-out infinite;
}
.reef-sonar svg { width: 100%; height: 100%; display: block; }

.wave-divider--reef {
    max-width: 1100px;
    margin: clamp(3rem, 6vw, 5rem) auto 0;
}

/* ========================================================================
   ZONE 4 · THE ABYSS
   ======================================================================== */
.abyss {
    background: linear-gradient(180deg, #ede4d0 0%, #6b5e4f 12%, var(--soft-navy) 40%, var(--deep-ocean) 70%, var(--void-black) 100%);
    color: var(--cream-dim);
    padding: clamp(6rem, 12vw, 12rem) clamp(1.5rem, 4vw, 4rem) clamp(4rem, 8vw, 8rem);
    text-align: center;
    min-height: 100vh;
    position: relative;
    overflow: hidden;
}

.abyss-header {
    max-width: 900px;
    margin: 0 auto clamp(3rem, 5vw, 5rem);
}

.abyss-chapter { color: var(--biolum); opacity: 0.8; }

.abyss-heading {
    font-family: var(--font-display);
    font-variation-settings: 'opsz' 72, 'SOFT' 0, 'wght' 700;
    font-size: clamp(1.6rem, 3.8vw, 2.8rem);
    line-height: 1.05;
    letter-spacing: -0.015em;
    color: var(--cream-paper);
    font-style: italic;
}

.sonar-log {
    list-style: none;
    max-width: 820px;
    margin: 0 auto clamp(4rem, 8vw, 8rem);
    text-align: left;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    letter-spacing: 0.03em;
    border-top: 1px solid rgba(127, 179, 211, 0.15);
    border-bottom: 1px solid rgba(127, 179, 211, 0.15);
}

.log-entry {
    display: grid;
    grid-template-columns: 130px 170px 110px 1fr;
    gap: 1rem;
    padding: 0.95rem 1rem;
    border-bottom: 1px dashed rgba(127, 179, 211, 0.12);
    color: var(--cream-dim);
    align-items: start;
    transition:
        background-color 0.35s ease,
        transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1),
        box-shadow 0.35s ease;
    cursor: default;
}
.log-entry:last-child { border-bottom: none; }

.log-entry:hover {
    background: rgba(127, 179, 211, 0.06);
    transform: translateY(-2px);
    box-shadow: 0 4px 14px rgba(127, 179, 211, 0.08);
}

.log-time   { color: var(--biolum); font-weight: 500; }
.log-coord  { color: var(--pale-gold); }
.log-depth  { color: var(--warm-amber); text-align: right; }
.log-text   { color: var(--cream-dim); font-family: var(--font-body); font-style: italic; font-size: 0.95rem; letter-spacing: 0; }
.log-text em { color: var(--biolum); }

/* Pulsing bioluminescent circle */
.sonar-pulse-wrap {
    margin: clamp(2rem, 4vw, 4rem) auto 2.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.sonar-pulse {
    position: relative;
    width: clamp(90px, 11vw, 140px);
    height: clamp(90px, 11vw, 140px);
    border-radius: 50%;
    background: radial-gradient(circle, rgba(127, 179, 211, 0.45) 0%, rgba(127, 179, 211, 0.12) 55%, transparent 80%);
    cursor: pointer;
    animation: sonar-ping 4s ease-in-out infinite;
}

.sonar-pulse::before, .sonar-pulse::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 1px solid rgba(127, 179, 211, 0.6);
    animation: sonar-ring-expand 4s ease-out infinite;
}
.sonar-pulse::after { animation-delay: 2s; }

.sonar-pulse-core {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 28%;
    height: 28%;
    border-radius: 50%;
    background: radial-gradient(circle, var(--biolum) 0%, rgba(127,179,211,0.4) 60%, transparent 100%);
    box-shadow: 0 0 30px rgba(127, 179, 211, 0.6);
    animation: core-glow 3s ease-in-out infinite;
}

@keyframes sonar-ping {
    0%, 100% { transform: scale(1);     box-shadow: 0 0 0 0 rgba(127, 179, 211, 0.35); opacity: 0.75; }
    50%      { transform: scale(1.05);  box-shadow: 0 0 0 22px rgba(127, 179, 211, 0); opacity: 0.95; }
}
@keyframes sonar-ring-expand {
    0%   { transform: scale(1);   opacity: 0.7; }
    100% { transform: scale(2.2); opacity: 0;   }
}
@keyframes core-glow {
    0%, 100% { box-shadow: 0 0 20px rgba(127, 179, 211, 0.5); }
    50%      { box-shadow: 0 0 40px rgba(127, 179, 211, 0.8); }
}

.sonar-pulse:hover {
    animation-play-state: paused;
    transform: scale(1.1);
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.sonar-pulse-caption {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--biolum);
    opacity: 0.7;
}

.colophon {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.82rem;
    color: var(--cream-dim);
    opacity: 0.55;
    max-width: 620px;
    margin: 3rem auto 0;
    line-height: 1.7;
}

/* ========================================================================
   Scroll-reveal initial states (kept subtle)
   ======================================================================== */
.specimen-card { opacity: 0; transform-origin: center; }
.specimen-card.is-visible { opacity: 1; animation: card-drift-in 0.9s cubic-bezier(0.22, 0.9, 0.3, 1) both; }

@keyframes card-drift-in {
    0%   { opacity: 0; transform: translateY(24px) rotate(var(--rest-rot, 0deg)) scale(0.985); }
    100% { opacity: 1; }
}

.specimen-card:nth-child(4n+1) { --rest-rot: -1.2deg; }
.specimen-card:nth-child(4n+2) { --rest-rot: 0.9deg;  }
.specimen-card:nth-child(4n+3) { --rest-rot: -0.6deg; }
.specimen-card:nth-child(4n+4) { --rest-rot: 1.4deg;  }

.log-entry { opacity: 0; transform: translateY(8px); transition: opacity 0.5s ease, transform 0.5s ease, background-color 0.35s ease, box-shadow 0.35s ease; }
.log-entry.is-visible { opacity: 1; transform: translateY(0); }

/* ========================================================================
   Responsive — mobile stacks cards vertically (no overlap)
   ======================================================================== */
@media (max-width: 860px) {
    .specimen-labels {
        height: auto;
        display: flex;
        flex-wrap: wrap;
        gap: 1rem;
        justify-content: center;
        padding: 2rem 0.5rem;
    }
    .specimen-label {
        position: relative !important;
        top: auto !important;
        left: auto !important;
        right: auto !important;
        bottom: auto !important;
    }
    .specimen-label--tides    { transform: rotate(-2deg); }
    .specimen-label--depths   { transform: rotate(1.5deg); }
    .specimen-label--currents { transform: rotate(-1deg); }
    .specimen-label--signals  { transform: rotate(2deg); }

    .thermocline-inner { margin-left: 5rem; }
    .depth-gauge { width: 60px; }

    .reef-board {
        min-height: auto;
        display: flex;
        flex-direction: column;
        gap: 2rem;
        padding: 0 0.5rem;
    }
    .specimen-card {
        position: relative !important;
        left: auto !important;
        top: auto !important;
        width: 100% !important;
    }
    .specimen-card:nth-child(4n+1) { transform: rotate(-0.6deg); margin-left: 0; }
    .specimen-card:nth-child(4n+2) { transform: rotate(0.5deg);  margin-left: 1rem; }
    .specimen-card:nth-child(4n+3) { transform: rotate(-0.3deg); margin-left: -0.5rem; }
    .specimen-card:nth-child(4n+4) { transform: rotate(0.7deg);  margin-left: 0.5rem; }

    .reef-sonar { display: none; }

    .log-entry {
        grid-template-columns: 1fr 1fr;
        gap: 0.4rem;
    }
    .log-text { grid-column: 1 / -1; }
    .log-depth { text-align: left; }
}

@media (max-width: 520px) {
    .thermocline-inner { margin-left: 4.5rem; }
    .wordmark { letter-spacing: -0.02em; }
    .wordmark-korean { letter-spacing: 0.3em; }
}