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

:root {
    --void: #0a0a0f;
    --noise: #1a1a2a;
    --spectrum-start: #ff006e;
    --spectrum-mid: #8338ec;
    --spectrum-end: #3a86ff;
    --wave: #00f5d4;
    --text: #e0e0f0;
    --dim: #5a5a7a;
    --hue: 0;
}

html {
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
}

body {
    background: var(--void);
    color: var(--text);
    font-family: 'Instrument Sans', sans-serif;
    font-size: 0.95rem;
    line-height: 1.7;
    font-weight: 400;
    overflow-x: hidden;
}

/* === ROOMS === */
.room {
    min-height: 100vh;
    position: relative;
    overflow: hidden;
    scroll-snap-align: start;
    display: flex;
    align-items: center;
    justify-content: center;
}

.room-content {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 2rem;
    max-width: 600px;
}

.room-label {
    display: inline-block;
    font-family: 'Space Mono', monospace;
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--dim);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    margin-bottom: 1rem;
}

.room-title {
    font-family: 'Syne', sans-serif;
    font-size: clamp(2rem, 5vw, 4.5rem);
    font-weight: 700;
    color: var(--text);
    margin-bottom: 1rem;
    line-height: 1.1;
}

.room-description {
    color: var(--dim);
    margin-bottom: 1.5rem;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

.room-param {
    font-family: 'Space Mono', monospace;
    font-size: 0.8rem;
    color: var(--wave);
}

/* === THRESHOLD (HERO) === */
#threshold {
    background: var(--noise);
}

#noise-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    image-rendering: auto;
}

.threshold-content {
    opacity: 0;
    animation: fadeIn 1.5s ease 1s forwards;
}

.site-title {
    font-family: 'Syne', sans-serif;
    font-size: clamp(2.5rem, 7vw, 6rem);
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

.site-subtitle {
    font-family: 'Space Mono', monospace;
    font-size: 0.85rem;
    color: var(--dim);
    letter-spacing: 0.15em;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    animation: pulse 2s ease-in-out infinite;
    opacity: 0;
    animation: fadeIn 1s ease 2.5s forwards, pulse 2s ease-in-out 3.5s infinite;
}

@keyframes fadeIn {
    to { opacity: 1; }
}

@keyframes pulse {
    0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.6; }
    50% { transform: translateX(-50%) translateY(8px); opacity: 1; }
}

/* === COLOR ROOM === */
#color-room {
    background: var(--void);
}

.color-gradient-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: hsl(var(--hue), 70%, 40%);
    opacity: 0.6;
    transition: background 0.05s linear;
}

/* === SOUND ROOM === */
#sound-room {
    background: var(--noise);
}

#sound-noise-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    image-rendering: auto;
    opacity: 0.3;
}

.waveform-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 5;
}

.waveform-layer path {
    fill: none;
    stroke-linecap: round;
}

/* === TIME ROOM === */
#time-room {
    background: var(--void);
}

#time-particles-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.4;
}

.clock-container {
    margin: 1.5rem auto;
}

#clock-svg {
    filter: drop-shadow(0 0 20px rgba(0, 245, 212, 0.15));
}

.time-slider {
    display: block;
    width: 200px;
    margin: 1rem auto 0;
    -webkit-appearance: none;
    appearance: none;
    height: 2px;
    background: var(--dim);
    border-radius: 1px;
    outline: none;
    cursor: pointer;
}

.time-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--wave);
    border-radius: 50%;
    cursor: pointer;
}

.time-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    background: var(--wave);
    border-radius: 50%;
    border: none;
    cursor: pointer;
}

/* === SPACE ROOM === */
#space-room {
    background: var(--void);
}

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

/* === CONVERGENCE === */
#convergence {
    background: var(--noise);
}

#convergence-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    image-rendering: auto;
    opacity: 0.3;
    mix-blend-mode: screen;
}

.convergence-gradient-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--spectrum-start), var(--spectrum-mid), var(--spectrum-end));
    opacity: 0.25;
    mix-blend-mode: screen;
}

#convergence-waveform {
    mix-blend-mode: screen;
    opacity: 0.5;
}

.convergence-content {
    z-index: 20;
}

/* === SCROLLBAR === */
::-webkit-scrollbar {
    width: 4px;
}

::-webkit-scrollbar-track {
    background: var(--void);
}

::-webkit-scrollbar-thumb {
    background: var(--dim);
    border-radius: 2px;
}

/* === SELECTION === */
::selection {
    background: var(--spectrum-mid);
    color: var(--text);
}