/* ============================================
   namu.quest — Film Grain Forest Experience
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --bg-light: #f5efe6;
    --bg-secondary: #ede0d4;
    --text-dark: #2b2926;
    --accent-warm: #c9a396;
    --accent-cool: #8a9e8f;
    --bg-dark: #1a1e1c;
    --text-light: #e8e2d8;
    --grain-warm: #d4c5b3;
    --grain-cool: #3a4540;
    --grain-opacity: 0.45;
    --grain-blend: multiply;
    --column-width: 480px;
    --column-padding: 2rem;
}

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

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

body {
    font-family: 'DM Sans', 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-dark);
    background: var(--bg-light);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* --- SVG Filter Source (hidden) --- */
#grain-svg {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

/* --- Film Grain Overlay --- */
.grain-overlay {
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    pointer-events: none;
    z-index: 1000;
    opacity: var(--grain-opacity);
    mix-blend-mode: var(--grain-blend);
    will-change: transform, filter;
    filter: url(#grain-filter-1);
    background: var(--grain-warm);
    animation: grain-cycle 0.5s steps(4) infinite;
}

@keyframes grain-cycle {
    0% { filter: url(#grain-filter-1); transform: translate(0, 0); }
    25% { filter: url(#grain-filter-2); transform: translate(-2%, -1%); }
    50% { filter: url(#grain-filter-3); transform: translate(1%, 2%); }
    75% { filter: url(#grain-filter-4); transform: translate(-1%, -2%); }
    100% { filter: url(#grain-filter-1); transform: translate(2%, 1%); }
}

/* --- Page Container with gradient background --- */
#page-container {
    position: relative;
    width: 100%;
    background: linear-gradient(
        to bottom,
        #f5efe6 0%,
        #f5efe6 10%,
        #ede0d4 18%,
        #f5efe6 35%,
        #f5efe6 45%,
        #3a4a40 58%,
        #1a1e1c 65%,
        #1a1e1c 85%,
        #2b2926 100%
    );
}

/* --- Ring Sections --- */
.ring {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    width: 100%;
}

#ring-0 {
    min-height: 100vh;
}

#ring-1 {
    min-height: 120vh;
}

#ring-2 {
    min-height: 150vh;
}

#ring-3 {
    min-height: 100vh;
}

#ring-4 {
    min-height: 80vh;
}

/* --- Ring Content (Narrow Center Column) --- */
.ring-content {
    position: relative;
    z-index: 10;
    max-width: var(--column-width);
    width: 100%;
    padding: 0 var(--column-padding);
    margin: 0 auto;
    text-align: center;
}

/* --- Ring Labels --- */
.ring-label {
    display: block;
    font-family: 'Space Grotesk', 'Helvetica Neue', Arial, sans-serif;
    font-weight: 300;
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent-cool);
    margin-bottom: 3rem;
    opacity: 0.6;
}

.ring-label-light {
    color: var(--text-light);
    opacity: 0.4;
}

.glyph {
    font-size: 0.65rem;
    vertical-align: middle;
}

/* --- Domain Name (Ring 0) --- */
.domain-name {
    font-family: 'Space Grotesk', 'Helvetica Neue', Arial, sans-serif;
    font-weight: 500;
    font-size: clamp(2.8rem, 8vw, 5.6rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-dark);
    line-height: 1.1;
}

.letter {
    display: inline-block;
    opacity: 0;
    transform: translate(
        calc((var(--rand-x, 0) - 0.5) * 200px),
        calc((var(--rand-y, 0) - 0.5) * 200px)
    ) scale(0);
    animation: letter-assemble 0.6s cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
    animation-delay: calc(0.3s + var(--delay) * 0.25s);
}

@keyframes letter-assemble {
    0% {
        opacity: 0;
        transform: translate(
            calc((var(--rand-x, 0) - 0.5) * 200px),
            calc((var(--rand-y, 0) - 0.5) * 200px)
        ) scale(0);
        filter: blur(8px);
    }
    60% {
        opacity: 0.7;
        filter: blur(2px);
    }
    100% {
        opacity: 1;
        transform: translate(0, 0) scale(1);
        filter: blur(0);
    }
}

/* --- Poetic Text --- */
.poetic-text {
    font-family: 'DM Sans', 'Helvetica Neue', Arial, sans-serif;
    font-weight: 300;
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    letter-spacing: 0.02em;
    line-height: 1.75;
    color: var(--text-dark);
}

.text-light {
    color: var(--text-light);
}

.text-secondary {
    margin-top: 3rem;
    opacity: 0.7;
    font-weight: 400;
}

/* --- Root SVGs (Ring 1) --- */
.root-svg {
    display: block;
    width: 100%;
    height: 80px;
    overflow: visible;
    margin: 2rem 0;
}

.root-below {
    transform: scaleY(-1);
}

/* --- Trunk Section (Ring 2) --- */
.trunk-content {
    display: flex;
    flex-direction: column;
    gap: 8vh;
}

.trunk-block {
    position: relative;
    padding: 2rem 1.5rem;
}

.grain-border {
    position: absolute;
    inset: 0;
    border: 2px solid transparent;
    border-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' seed='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E") 2 fill;
    opacity: 0.4;
    pointer-events: none;
}

/* Horizon line in Ring 2 */
.horizon-line {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--accent-warm);
    opacity: 0.35;
    z-index: 5;
}

/* --- Wireframe Tree (Ring 2) --- */
.wireframe-tree-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(calc(-50% + 300px), -50%);
    width: 200px;
    height: 400px;
    z-index: 5;
    opacity: 0.6;
}

.wireframe-tree {
    width: 100%;
    height: 100%;
    overflow: visible;
}

/* --- Canopy Canvas (Ring 3) --- */
.canopy-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    opacity: 0.3;
}

/* --- Spore Container (Ring 4) --- */
.spore-container {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: 5;
    pointer-events: none;
}

.spore {
    position: absolute;
    bottom: -10px;
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--text-light);
    opacity: 0;
    animation: spore-rise linear infinite;
}

@keyframes spore-rise {
    0% {
        opacity: 0;
        transform: translateY(0) translateX(0);
    }
    10% {
        opacity: var(--spore-opacity, 0.5);
    }
    90% {
        opacity: var(--spore-opacity, 0.5);
    }
    100% {
        opacity: 0;
        transform: translateY(calc(-100vh - 20px)) translateX(var(--spore-drift, 30px));
    }
}

/* --- Closing Word (Ring 4) --- */
.closing-word {
    font-family: 'Space Grotesk', 'Helvetica Neue', Arial, sans-serif;
    font-weight: 500;
    font-size: clamp(2rem, 6vw, 4rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 4rem;
}

.domain-echo {
    font-family: 'Space Grotesk', 'Helvetica Neue', Arial, sans-serif;
    font-weight: 300;
    font-size: clamp(0.8rem, 2vw, 1rem);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    opacity: 0.2;
}

/* --- Margin Branches --- */
.margin-branches {
    position: fixed;
    top: 0;
    width: 300px;
    height: 100vh;
    z-index: 5;
    pointer-events: none;
    opacity: 0.15;
    overflow: visible;
}

.margin-left {
    left: 0;
}

.margin-right {
    right: 0;
}

/* --- Concentric Ring Decorations --- */
.concentric-rings {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 2;
    opacity: 0;
    transition: opacity 0.8s ease;
}

.concentric-ring {
    position: absolute;
    border: 1px solid var(--accent-cool);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.15;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    :root {
        --column-width: 100%;
        --column-padding: 1.5rem;
    }

    .wireframe-tree-container {
        transform: translate(-50%, -30%);
        opacity: 0.3;
        width: 150px;
        height: 300px;
    }

    .margin-branches {
        display: none;
    }
}

@media (max-width: 480px) {
    :root {
        --column-padding: 1rem;
    }

    .trunk-content {
        gap: 5vh;
    }
}