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

:root {
    --deep-teal: #1a4a4a;
    --abyss: #0d1a1a;
    --dark-teal: #1a3a3a;
    --parchment: #f0e6d2;
    --coral: #e07a5f;
    --gold: #c9a96e;
    --deep-ocean: #0a2e2e;
    --amber: #e8c87a;
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Cormorant Garamond', serif;
    --font-mono: 'IBM Plex Mono', monospace;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--abyss);
    color: var(--parchment);
    font-family: var(--font-body);
}

#viewport {
    position: relative;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background: radial-gradient(ellipse at 50% 80%, var(--deep-ocean) 0%, var(--abyss) 70%);
}

#aquarium-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

/* HUD Panels */
.hud-panel {
    position: fixed;
    z-index: 10;
    padding: 1.5rem;
    background: rgba(10, 46, 46, 0.4);
    border: 1px solid rgba(201, 169, 110, 0.2);
    backdrop-filter: blur(8px);
    transition: opacity 0.6s ease;
}

#hud-top-left {
    top: 2rem;
    left: 2rem;
}

.wordmark {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.2rem, 2.5vw, 2rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--parchment);
    margin-bottom: 0.25rem;
}

.subtitle {
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--gold);
    opacity: 0.7;
    font-style: italic;
}

#hud-top-right {
    top: 2rem;
    right: 2rem;
}

.nav-list {
    list-style: none;
    display: flex;
    gap: 1.5rem;
}

.nav-list a {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--gold);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.7;
    transition: opacity 0.3s ease, color 0.3s ease;
}

.nav-list a:hover,
.nav-list a.active {
    opacity: 1;
    color: var(--parchment);
}

#hud-bottom-left {
    bottom: 2rem;
    left: 2rem;
}

.depth-gauge {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.gauge-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    color: var(--gold);
    opacity: 0.6;
}

.gauge-bar {
    width: 80px;
    height: 3px;
    background: rgba(201, 169, 110, 0.2);
    border-radius: 2px;
    overflow: hidden;
}

.gauge-fill {
    height: 100%;
    width: 25%;
    background: var(--gold);
    border-radius: 2px;
    transition: width 0.8s ease;
}

.gauge-value {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--parchment);
    min-width: 1.5em;
}

#hud-bottom-right {
    bottom: 2rem;
    right: 2rem;
}

.coordinates {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.2rem;
}

.coord-line {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--parchment);
    opacity: 0.6;
}

.coord-line.dim {
    color: var(--gold);
    opacity: 0.4;
}

/* Narrative Panel */
#narrative-panel {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 5;
    max-width: 560px;
    width: 80%;
    text-align: center;
}

.typewriter-frame {
    background: rgba(10, 46, 46, 0.5);
    border: 1px solid rgba(201, 169, 110, 0.15);
    backdrop-filter: blur(12px);
    padding: 2.5rem 2rem;
    border-radius: 2px;
    min-height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.typewriter-text {
    font-family: var(--font-body);
    font-size: clamp(1rem, 2vw, 1.4rem);
    font-weight: 400;
    line-height: 1.8;
    color: var(--parchment);
    font-style: italic;
}

.cursor {
    color: var(--amber);
    animation: blink 1s step-end infinite;
    font-weight: 100;
    margin-left: 2px;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.page-indicator {
    margin-top: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--gold);
    opacity: 0.5;
    letter-spacing: 0.15em;
}

/* Scroll Prompt */
.scroll-prompt {
    position: fixed;
    bottom: 5rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    animation: float 3s ease-in-out infinite;
    transition: opacity 1s ease;
}

.scroll-prompt span {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    color: var(--gold);
    opacity: 0.5;
    text-transform: uppercase;
}

@keyframes float {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(6px); }
}

/* Bubbles */
#bubbles {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    overflow: hidden;
}

.bubble {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(201, 169, 110, 0.15);
    background: rgba(201, 169, 110, 0.03);
    animation: rise linear infinite;
}

@keyframes rise {
    0% { transform: translateY(100vh) translateX(0); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(-10vh) translateX(20px); opacity: 0; }
}

/* Fish SVG overlay */
.fish-svg {
    position: absolute;
    z-index: 2;
    opacity: 0.5;
    pointer-events: none;
}