/* =============================================
   rust.quest — Zen Computing Dojo Stylesheet
   ============================================= */

/* CSS Custom Properties */
:root {
    --void-iron: #0f0d0b;
    --forge-shadow: #1a1510;
    --rust-core: #d4752c;
    --ember-glow: #c45d2e;
    --patina-copper: #f0a67a;
    --warm-parchment: #e8d5c4;
    --ash-whisper: #8a7b6e;
    --molten-highlight: #ff8c42;
}

/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
    overflow-x: hidden;
    background: var(--void-iron);
}

body {
    font-family: 'Varela Round', sans-serif;
    color: var(--warm-parchment);
    background: var(--void-iron);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* =============================================
   HUD Overlay
   ============================================= */
#hud-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 100;
}

#hud-frame {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

#hud-chamber-label {
    position: absolute;
    top: 24px;
    left: 32px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--ember-glow);
    opacity: 0.7;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

#hud-chamber-num {
    color: var(--rust-core);
    font-weight: 500;
}

#hud-glyph {
    position: absolute;
    top: 18px;
    right: 48px;
    font-size: 1.6rem;
    color: var(--ember-glow);
    opacity: 0.25;
    transition: opacity 600ms ease;
}

#hud-indicators {
    position: absolute;
    left: 32px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.hud-indicator {
    width: 8px;
    height: 8px;
    border: 1px solid var(--ember-glow);
    opacity: 0.3;
    transition: all 400ms ease;
}

.hud-indicator.active {
    background: var(--rust-core);
    opacity: 1;
    box-shadow: 0 0 8px rgba(212, 117, 44, 0.4);
}

#hud-progress-track {
    position: absolute;
    right: 24px;
    top: 15%;
    height: 70%;
    width: 2px;
    background: rgba(196, 93, 46, 0.1);
}

#hud-progress-bar {
    width: 100%;
    height: 0%;
    background: var(--molten-highlight);
    transition: height 200ms ease-out;
    transform-origin: top;
}

#hud-domain {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.7rem;
    font-weight: 400;
    color: var(--ash-whisper);
    opacity: 0.4;
    letter-spacing: 0.25em;
    text-transform: uppercase;
}

/* =============================================
   Gear Mandala
   ============================================= */
#gear-mandala {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 90;
    opacity: 0;
    transition: opacity 200ms ease;
    pointer-events: none;
}

#gear-mandala.visible {
    opacity: 1;
}

#gear-mandala.hidden {
    opacity: 0;
}

@keyframes mandala-spin {
    from { transform: translate(100,100) rotate(0deg); }
    to { transform: translate(100,100) rotate(360deg); }
}

/* =============================================
   Noise Overlay
   ============================================= */
#noise-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 50;
    opacity: 0.03;
}

#noise-overlay svg {
    width: 100%;
    height: 100%;
}

/* =============================================
   Particle Container
   ============================================= */
#particles-container {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 10;
    overflow: hidden;
}

.dust-particle {
    position: absolute;
    width: 2px;
    height: 2px;
    border-radius: 50%;
    background: var(--patina-copper);
    opacity: 0.1;
    animation: float-up linear infinite;
}

@keyframes float-up {
    from {
        transform: translateY(100vh) translateX(0);
    }
    to {
        transform: translateY(-20px) translateX(20px);
    }
}

/* =============================================
   Chamber (Sections)
   ============================================= */
.chamber {
    position: relative;
    min-height: 100vh;
    scroll-snap-align: start;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--void-iron);
}

/* Depth Layer: Background */
.chamber-bg {
    position: absolute;
    inset: 0;
    z-index: 1;
    filter: blur(16px);
    opacity: 0.3;
    transition: filter 800ms cubic-bezier(0.25, 0.46, 0.45, 0.94),
                opacity 800ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
    will-change: filter, opacity;
}

.chamber.active .chamber-bg {
    filter: blur(8px);
    opacity: 0.4;
}

.bg-pattern {
    width: 100%;
    height: 100%;
}

/* Depth Layer: Midground */
.chamber-midground {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    filter: blur(4px);
    opacity: 0.6;
    transition: filter 800ms cubic-bezier(0.25, 0.46, 0.45, 0.94),
                opacity 800ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
    will-change: filter, opacity;
}

.chamber.active .chamber-midground {
    filter: blur(0px);
    opacity: 0.85;
}

.hud-diagram {
    max-width: 380px;
    max-height: 380px;
    opacity: 0.9;
}

/* Depth Layer: Foreground (Content) */
.chamber-foreground {
    position: relative;
    z-index: 5;
    max-width: 640px;
    padding: 0 2rem;
    text-align: center;
    filter: blur(8px);
    opacity: 0.3;
    transition: filter 800ms cubic-bezier(0.25, 0.46, 0.45, 0.94) 200ms,
                opacity 800ms cubic-bezier(0.25, 0.46, 0.45, 0.94) 200ms;
    will-change: filter, opacity;
}

.chamber.active .chamber-foreground {
    filter: blur(0px);
    opacity: 1;
}

/* =============================================
   Typography
   ============================================= */
.chamber-label {
    display: block;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--ash-whisper);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: 1rem;
    opacity: 0.6;
}

.chamber-title {
    font-family: 'Nunito', sans-serif;
    font-weight: 800;
    font-size: clamp(2.4rem, 6vw, 4.8rem);
    color: var(--rust-core);
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.chamber-text {
    font-family: 'Varela Round', sans-serif;
    font-weight: 400;
    font-size: clamp(1rem, 1.8vw, 1.25rem);
    line-height: 1.85;
    letter-spacing: 0.01em;
    color: var(--warm-parchment);
    max-width: 540px;
    margin: 0 auto;
}

/* =============================================
   Stagger Animation Delays for Active Chamber
   ============================================= */
.chamber.active .chamber-label {
    transition-delay: 0ms;
}

.chamber.active .chamber-title {
    transition-delay: 100ms;
}

.chamber.active .chamber-text {
    transition-delay: 300ms;
}

/* Individual foreground element transitions */
.chamber-label,
.chamber-title,
.chamber-text {
    filter: blur(8px);
    opacity: 0.3;
    transition: filter 800ms cubic-bezier(0.25, 0.46, 0.45, 0.94),
                opacity 800ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
    will-change: filter, opacity;
}

.chamber.active .chamber-label {
    filter: blur(0);
    opacity: 0.6;
}

.chamber.active .chamber-title {
    filter: blur(0);
    opacity: 1;
}

.chamber.active .chamber-text {
    filter: blur(0);
    opacity: 0.9;
}

/* Override the parent foreground blur when active since children handle it */
.chamber.active .chamber-foreground {
    filter: none;
    opacity: 1;
}

.chamber .chamber-foreground {
    filter: none;
    opacity: 1;
}

/* =============================================
   SVG Animations Control
   ============================================= */
.chamber .hud-diagram * {
    animation-play-state: paused;
}

.chamber.active .hud-diagram * {
    animation-play-state: running;
}

/* =============================================
   Alternating Chamber Backgrounds
   ============================================= */
#chamber-ownership {
    background: var(--void-iron);
}

#chamber-borrowing {
    background: var(--forge-shadow);
}

#chamber-lifetimes {
    background: var(--void-iron);
}

#chamber-traits {
    background: var(--forge-shadow);
}

#chamber-concurrency {
    background: var(--void-iron);
}

/* =============================================
   Responsive Adjustments
   ============================================= */
@media (max-width: 768px) {
    .hud-diagram {
        max-width: 280px;
        max-height: 280px;
    }

    .chamber-foreground {
        padding: 0 1.5rem;
    }

    #hud-glyph {
        right: 28px;
        font-size: 1.2rem;
    }

    #hud-chamber-label {
        font-size: 0.65rem;
    }

    #hud-indicators {
        left: 16px;
    }

    #hud-progress-track {
        right: 12px;
    }

    .chamber-midground {
        opacity: 0.4;
    }

    .chamber.active .chamber-midground {
        opacity: 0.6;
    }
}

@media (max-width: 480px) {
    .chamber-title {
        font-size: clamp(1.8rem, 8vw, 2.8rem);
    }

    .chamber-text {
        font-size: 0.95rem;
        line-height: 1.7;
    }

    .hud-diagram {
        max-width: 220px;
        max-height: 220px;
    }
}