/* === RESET & BASE === */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --void: #0a0a0f;
    --surface: #12121f;
    --amber: #d4a017;
    --amber-dim: #8b6914;
    --amber-bright: #f0c040;
    --blue: #2d7dd2;
    --text-primary: #e8e4dc;
    --text-secondary: #6b6b7b;
    --danger: #8b1a1a;
    --grid-line: #1a1a24;
    --border: rgba(212, 160, 23, 0.4);
    --glow: 0 0 8px rgba(212, 160, 23, 0.3), 0 0 20px rgba(212, 160, 23, 0.1);
}

/* Typography compliance notes: Space Grotesk" (Google Fonts (500 700), IBM Plex Sans" (Google Fonts (300 400), IBM Plex Mono" (Google Fonts (300), equivalent sizes. Intercepted Broadcast (200vh - 500vh). IntersectionObserver` for skeleton-loading triggers. Limit canvas noise to every 150ms to prevent frame drops. */

html {
    scroll-behavior: smooth;
}

body {
    background: var(--void);
    color: var(--text-primary);
    font-family: 'IBM Plex Sans', sans-serif;
    font-weight: 400;
    line-height: 1.75;
    overflow-x: hidden;
}

/* === CRT SCAN-LINE OVERLAY === */
#scanline-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    background: repeating-linear-gradient(
        to bottom,
        transparent 0px,
        transparent 1px,
        rgba(10, 10, 15, 0.15) 1px,
        rgba(10, 10, 15, 0.15) 2px
    );
    transition: opacity 1s;
}

/* === NOISE CANVAS === */
#noise-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9998;
}

/* === SECTION 1: SIGNAL LOCK === */
.section-signal-lock {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    background: var(--void);
    display: flex;
    align-items: center;
    justify-content: center;
}

.kanji-outline {
    position: absolute;
    right: -5vw;
    top: 50%;
    transform: translateY(-50%);
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 45vw;
    font-weight: 700;
    color: transparent;
    -webkit-text-stroke: 2px var(--amber);
    text-shadow: var(--glow);
    animation: phosphor-pulse 4s ease-in-out infinite;
    user-select: none;
}

@keyframes phosphor-pulse {
    0%, 100% { opacity: 0.6; -webkit-text-stroke-color: var(--amber-dim); }
    50% { opacity: 1; -webkit-text-stroke-color: var(--amber); }
}

.scan-line-sweep {
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(to right, transparent, var(--amber), transparent);
    box-shadow: 0 0 12px rgba(212, 160, 23, 0.4);
    animation: sweep-down 3s linear infinite;
    z-index: 2;
}

@keyframes sweep-down {
    0% { top: -2px; opacity: 1; }
    100% { top: 100%; opacity: 0.3; }
}

.signal-text {
    position: absolute;
    bottom: 12vh;
    left: 5vw;
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 300;
    font-size: clamp(0.7rem, 0.9vw, 0.85rem);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--amber);
    text-shadow: var(--glow);
    z-index: 3;
}

.signal-char {
    opacity: 0;
    animation: char-decode 0.1s forwards;
}

@keyframes char-decode {
    0% { opacity: 0; filter: blur(4px); }
    100% { opacity: 1; filter: blur(0); }
}

/* === BROADCAST STRIPE === */
.broadcast-stripe {
    width: 100%;
    height: 3px;
    background: repeating-linear-gradient(
        to right,
        var(--amber) 0px,
        var(--amber) 10px,
        var(--void) 10px,
        var(--void) 20px
    );
    animation: stripe-pulse 2s ease-in-out infinite;
}

@keyframes stripe-pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* === SECTION 2: INTERCEPTED BROADCAST === */
#intercepted-broadcast {
    position: relative;
    padding: 10vh 0 15vh;
    min-height: 300vh;
}

.connection-lines {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.transmission-fragment {
    position: relative;
    max-width: 520px;
    padding: 25px 30px;
    border: 1px solid var(--border);
    background: var(--surface);
    margin-bottom: 8vh;
    z-index: 1;
    box-shadow: 0 0 15px rgba(212, 160, 23, 0.05);
}

.skeleton-shimmer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        var(--surface) 0%,
        rgba(139, 105, 20, 0.15) 40%,
        var(--surface) 80%
    );
    background-size: 200% 100%;
    animation: shimmer-wave 1.5s ease-in-out infinite;
    z-index: 5;
    transition: opacity 0.6s ease;
}

.skeleton-shimmer.permanent {
    opacity: 1 !important;
}

.skeleton-reveal.revealed .skeleton-shimmer:not(.permanent) {
    opacity: 0;
    pointer-events: none;
}

@keyframes shimmer-wave {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.fragment-content {
    opacity: 0;
    transition: opacity 0.8s ease 0.3s;
}

.skeleton-reveal.revealed .fragment-content {
    opacity: 0.9;
}

.fragment-header {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: clamp(1.5rem, 3.5vw, 3rem);
    letter-spacing: 0.08em;
    color: var(--amber);
    text-shadow: var(--glow);
    margin-bottom: 15px;
    line-height: 1.2;
}

.fragment-body {
    font-family: 'IBM Plex Sans', sans-serif;
    font-weight: 300;
    font-size: clamp(0.95rem, 1.2vw, 1.15rem);
    line-height: 1.75;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.fragment-meta {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 300;
    font-size: clamp(0.65rem, 0.8vw, 0.75rem);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

/* === REDACTED FRAGMENT === */
.redacted-fragment {
    min-height: 180px;
    overflow: hidden;
}

.redaction-bar {
    position: absolute;
    top: 30%;
    left: 10%;
    width: 80%;
    height: 20px;
    background: var(--danger);
    z-index: 6;
}

/* === SECTION 3: SURVEILLANCE MAP === */
#surveillance-map {
    position: relative;
    width: 100%;
    height: 130vh;
    overflow: hidden;
    background: var(--void);
}

#city-grid-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.surveillance-bubbles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.s-bubble {
    position: absolute;
    border-radius: 50%;
    background: rgba(212, 160, 23, 0.12);
    border: 1px solid rgba(212, 160, 23, 0.3);
    will-change: transform, opacity;
}

.s-bubble .bubble-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 7px;
    color: rgba(212, 160, 23, 0.4);
    letter-spacing: 0.1em;
    text-align: center;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    white-space: nowrap;
}

.surveillance-text {
    position: absolute;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    color: var(--amber);
    text-shadow: var(--glow);
    pointer-events: none;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.st-1 {
    top: 15%;
    left: 8%;
    font-size: clamp(2.5rem, 7vw, 6rem);
    opacity: 0.15;
}
.st-2 {
    top: 55%;
    right: 5%;
    font-size: clamp(1.2rem, 3vw, 2.5rem);
    opacity: 0.08;
}
.st-3 {
    top: 35%;
    left: 50%;
    font-size: clamp(1.8rem, 4vw, 3.5rem);
    opacity: 0.12;
    font-family: 'Noto Sans JP', sans-serif;
}
.st-4 {
    bottom: 20%;
    left: 20%;
    font-size: clamp(1.5rem, 3.5vw, 3rem);
    opacity: 0.1;
    font-family: 'Noto Sans KR', sans-serif;
}

/* === SECTION 4: RESISTANCE ARCHIVE === */
#resistance-archive {
    position: relative;
    padding: 10vh 0 15vh;
    min-height: 200vh;
}

.resistance-fragment {
    border-color: rgba(45, 125, 210, 0.4);
}

.resistance-header {
    color: var(--blue) !important;
    text-shadow: 0 0 8px rgba(45, 125, 210, 0.3), 0 0 20px rgba(45, 125, 210, 0.1) !important;
}

.resistance-meta {
    color: var(--blue) !important;
    opacity: 0.7;
}

/* === SECTION 5: SIGNAL LOSS === */
#signal-loss {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--void);
    overflow: hidden;
}

.signal-loss-content {
    text-align: center;
    z-index: 2;
}

.degrading-text {
    margin-bottom: 60px;
}

.degrade-line {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 500;
    font-size: clamp(1.2rem, 2.5vw, 2rem);
    letter-spacing: 0.08em;
    color: var(--amber);
    text-shadow: var(--glow);
    margin-bottom: 10px;
    transition: letter-spacing 0.5s, opacity 0.5s;
}

.final-message {
    opacity: 0;
    transition: opacity 1s ease;
}

.final-message p {
    font-family: 'Noto Sans KR', sans-serif;
    font-weight: 700;
    font-size: clamp(1.8rem, 4vw, 3.5rem);
    color: var(--blue);
    text-shadow: 0 0 12px rgba(45, 125, 210, 0.4), 0 0 30px rgba(45, 125, 210, 0.15);
    animation: flicker 3s ease-in-out forwards;
}

@keyframes flicker {
    0% { opacity: 1; }
    20% { opacity: 1; }
    25% { opacity: 0; }
    30% { opacity: 1; }
    50% { opacity: 1; }
    55% { opacity: 0; }
    60% { opacity: 1; }
    80% { opacity: 1; }
    100% { opacity: 0; }
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .transmission-fragment {
        max-width: 85vw;
        margin-left: 5vw !important;
    }
    .kanji-outline {
        font-size: 60vw;
    }
}