/* ============================================
   HHUDDL.com — Holographic Parchment
   Zen-contemplative, asymmetric progressive panels
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --deep-ground: #1B1340;
    --aged-vellum: #E8DCC8;
    --spectral-violet: #7B5EA7;
    --prismatic-teal: #4A9E9E;
    --iridescent-lavender: #B39DDB;
    --ink-black: #1A1A1A;
    --faded-graphite: #6B6560;
    --luminous-cyan: #80DEEA;

    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'DM Sans', sans-serif;
    --font-accent: 'IBM Plex Sans', sans-serif;

    --ease-reveal: cubic-bezier(0.23, 1, 0.32, 1);
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    background-color: var(--deep-ground);
    color: var(--ink-black);
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.8vw, 1.25rem);
    line-height: 1.75;
    letter-spacing: 0.01em;
    overflow-x: hidden;
}

/* --- SVG Filters (hidden) --- */
.svg-filters {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

/* --- Paper Texture Overlay --- */
.paper-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
    opacity: 0.10;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='256' height='256'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='256' height='256' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
    background-size: 256px 256px;
    mix-blend-mode: multiply;
}

/* --- Holographic Veil Transition --- */
.holo-veil {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 900;
    background: linear-gradient(135deg, var(--spectral-violet), var(--prismatic-teal), var(--iridescent-lavender), var(--luminous-cyan));
    opacity: 0;
    transition: opacity 600ms ease-in-out;
}

.holo-veil.active {
    opacity: 0.15;
}

/* --- Holographic Gradient Animation --- */
@keyframes holographic-shift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* --- Navigation: Iridescent Vertical Line --- */
.nav-line {
    position: fixed;
    left: 24px;
    top: 0;
    height: 100vh;
    width: 20px;
    z-index: 800;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-line-track {
    position: relative;
    width: 1px;
    height: 60%;
    background: linear-gradient(180deg, var(--spectral-violet), var(--prismatic-teal), var(--iridescent-lavender), var(--luminous-cyan));
    background-size: 100% 300%;
    animation: holographic-shift 12s ease-in-out infinite;
    border-radius: 1px;
}

.nav-line-progress {
    position: absolute;
    top: 0;
    left: -1px;
    width: 3px;
    height: 0%;
    background: linear-gradient(180deg, var(--spectral-violet), var(--luminous-cyan));
    border-radius: 2px;
    transition: height 800ms var(--ease-reveal);
}

.nav-tick {
    position: absolute;
    left: -4px;
    width: 9px;
    height: 1px;
    background-color: var(--faded-graphite);
    opacity: 0.5;
    transition: opacity 600ms ease, background-color 600ms ease;
}

.nav-tick:nth-child(2) { top: 0%; }
.nav-tick:nth-child(3) { top: 25%; }
.nav-tick:nth-child(4) { top: 50%; }
.nav-tick:nth-child(5) { top: 75%; }
.nav-tick:nth-child(6) { top: 100%; }

.nav-tick.active {
    opacity: 1;
    background-color: var(--luminous-cyan);
}

/* --- Chamber (Section) Base --- */
.chamber {
    position: relative;
    width: 100%;
    height: 100svh;
    overflow: hidden;
    display: flex;
    align-items: center;
}

.chamber:nth-child(odd of .chamber) {
    background-color: var(--deep-ground);
}

.chamber:nth-child(even of .chamber) {
    background-color: #1E1748;
}

/* --- Grid Systems --- */
.chamber-grid {
    display: grid;
    width: 100%;
    height: 100%;
    align-items: center;
}

.chamber-grid-left {
    grid-template-columns: 1fr minmax(280px, 38.2%) minmax(280px, 61.8%) 1fr;
}

.chamber-grid-right {
    grid-template-columns: 1fr minmax(280px, 61.8%) minmax(280px, 38.2%) 1fr;
}

.chamber-grid-left .chamber-content {
    grid-column: 2 / 3;
    padding: 2rem;
}

.chamber-grid-right .chamber-content {
    grid-column: 3 / 4;
    padding: 2rem;
}

/* --- Content Styling --- */
.chamber-content {
    max-width: 520px;
}

/* --- Typography --- */
.holographic-text {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: clamp(2.5rem, 6vw, 5rem);
    letter-spacing: 0.04em;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--spectral-violet), var(--prismatic-teal), var(--iridescent-lavender), var(--luminous-cyan));
    background-size: 300% 300%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: holographic-shift 12s ease-in-out infinite;
    margin-bottom: 1.5rem;
}

.body-text {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.8vw, 1.25rem);
    line-height: 1.75;
    letter-spacing: 0.01em;
    color: var(--aged-vellum);
    margin-bottom: 1.5rem;
}

.accent-text {
    font-family: var(--font-accent);
    font-weight: 300;
    font-size: 0.8125rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--faded-graphite);
    display: block;
}

/* --- Progressive Disclosure: Tiers --- */
.tier-1 {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 800ms var(--ease-reveal), transform 800ms var(--ease-reveal);
    transition-delay: 0ms;
}

.tier-2 {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 800ms var(--ease-reveal), transform 800ms var(--ease-reveal);
    transition-delay: 200ms;
}

.tier-3 {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 800ms var(--ease-reveal), transform 800ms var(--ease-reveal);
    transition-delay: 400ms;
}

/* When section is in view — tier-1 appears immediately */
.chamber.in-view .tier-1 {
    opacity: 1;
    transform: translateY(0);
}

/* After 1.2s dwell — tier-2 disclosed */
.chamber.disclosed .tier-2 {
    opacity: 1;
    transform: translateY(0);
}

/* After 2s dwell or hover — tier-3 deep-disclosed */
.chamber.deep-disclosed .tier-3 {
    opacity: 1;
    transform: translateY(0);
}

.chamber-content:hover .tier-3 {
    opacity: 1;
    transform: translateY(0);
}

/* --- Decorative Motifs --- */
.motif {
    position: absolute;
    pointer-events: none;
    opacity: 0.3;
    transition: opacity 1200ms ease;
}

.chamber.in-view .motif {
    opacity: 0.4;
}

.motif-dots {
    width: 160px;
    height: 160px;
    right: 8%;
    bottom: 12%;
}

.motif-dots-end {
    right: auto;
    left: auto;
    right: 10%;
    top: 15%;
    bottom: auto;
}

.motif-prism {
    width: 120px;
    height: 120px;
    left: 8%;
    top: 15%;
}

.motif-wave {
    width: 300px;
    height: 40px;
    right: 6%;
    bottom: 18%;
}

.motif-circuit {
    width: 150px;
    height: 150px;
    left: 6%;
    bottom: 10%;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .nav-line {
        left: 12px;
    }

    .chamber-grid-left,
    .chamber-grid-right {
        grid-template-columns: 1fr;
        padding: 0 2rem;
    }

    .chamber-grid-left .chamber-content,
    .chamber-grid-right .chamber-content {
        grid-column: 1 / -1;
        padding: 1.5rem;
        max-width: 100%;
    }

    .holographic-text {
        font-size: clamp(2rem, 8vw, 3.5rem);
    }

    .motif {
        display: none;
    }
}

@media (max-width: 480px) {
    .nav-line {
        display: none;
    }

    .chamber-grid-left,
    .chamber-grid-right {
        padding: 0 1.25rem;
    }
}