/* =============================================
   RRIDDL.com — Surreal Puzzle-Noir
   Palette: Jewel-tones on near-black
   ============================================= */

/* --- CSS Custom Properties --- */
:root {
    --obsidian-ink: #0d0d1a;
    --smoke-chamber: #1a1a2e;
    --parchment-glow: #e8e0d0;
    --patina-verdigris: #3d8b7a;
    --amber-cipher: #c49b3c;
    --riddle-rose: #8b3a5e;
    --ghost-line: #2a2a4a;
    --revelation-white: #f5f0e8;

    --ease-puzzle: cubic-bezier(0.23, 1, 0.32, 1);
    --font-headline: 'Playfair Display', Georgia, serif;
    --font-body: 'Source Serif 4', 'Source Serif Pro', Georgia, serif;
    --font-mono: 'Inconsolata', 'Courier New', monospace;
    --font-decorative: 'Cinzel Decorative', 'Playfair Display', serif;
}

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

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

body {
    background-color: var(--obsidian-ink);
    color: var(--parchment-glow);
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.75;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Typography Classes --- */
.playfair {
    font-family: var(--font-headline);
}

.source-serif {
    font-family: var(--font-body);
}

.inconsolata {
    font-family: var(--font-mono);
}

.cinzel-decorative {
    font-family: var(--font-decorative);
}

/* --- Grain Overlay --- */
#grain-overlay {
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    z-index: 100;
    pointer-events: none;
    opacity: 0.03;
    mix-blend-mode: overlay;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 256px 256px;
    will-change: transform;
    animation: grainShift 200ms steps(4) infinite;
}

@keyframes grainShift {
    0% { transform: translate(0, 0); }
    25% { transform: translate(-2%, -1%); }
    50% { transform: translate(1%, 2%); }
    75% { transform: translate(-1%, -2%); }
    100% { transform: translate(2%, 1%); }
}

/* --- Constellation Glyphs --- */
#constellation-glyphs {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.constellation-glyph {
    position: absolute;
    font-size: 18px;
    color: var(--ghost-line);
    opacity: 0;
    animation: glyphRise linear infinite;
    pointer-events: none;
    user-select: none;
}

@keyframes glyphRise {
    0% {
        opacity: 0.08;
        transform: translateY(0);
    }
    80% {
        opacity: 0.03;
    }
    100% {
        opacity: 0;
        transform: translateY(-100vh);
    }
}

/* --- Floating Decorative Overlay (z-20) --- */
#overlay-decorations {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 20;
    pointer-events: none;
    overflow: hidden;
}

.floating-glyph {
    position: absolute;
    opacity: 0.08;
    animation: slowSpin 60s linear infinite;
}

.floating-glyph:hover {
    opacity: 0.15;
}

.glyph-1 { top: 8%; left: 5%; animation-duration: 55s; }
.glyph-2 { top: 25%; right: 8%; animation-duration: 65s; animation-direction: reverse; }
.glyph-3 { top: 55%; left: 3%; animation-duration: 70s; }
.glyph-4 { top: 75%; right: 12%; animation-duration: 50s; animation-direction: reverse; }
.glyph-5 { top: 90%; left: 15%; animation-duration: 80s; }

@keyframes slowSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* --- Chamber Base --- */
.chamber {
    position: relative;
    min-height: 100vh;
    overflow: hidden;
}

.chamber-inner {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    padding: 120px 40px;
    z-index: 10;
}

/* --- Section Numbers (Decorative) --- */
.section-number {
    display: block;
    font-size: clamp(60px, 10vw, 120px);
    color: var(--ghost-line);
    mix-blend-mode: overlay;
    opacity: 0.3;
    line-height: 1;
    margin-bottom: 20px;
    user-select: none;
}

/* --- Chamber Titles --- */
.chamber-title {
    font-family: var(--font-headline);
    font-size: clamp(2.5rem, 6vw, 5.5rem);
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--parchment-glow);
    margin-bottom: 16px;
}

.chamber-subtitle {
    font-family: var(--font-body);
    font-size: 19px;
    font-weight: 400;
    color: var(--parchment-glow);
    opacity: 0.7;
    max-width: 600px;
    margin-bottom: 60px;
}

/* =============================================
   CHAMBER 1: Hero / Keyhole
   ============================================= */
#chamber-hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--obsidian-ink);
    z-index: 5;
}

#keyhole-mask {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    clip-path: ellipse(0% 0% at 50% 50%);
    background-color: var(--smoke-chamber);
    transition: clip-path 0.1s linear;
}

#keyhole-mask.keyhole-open {
    clip-path: ellipse(100% 100% at 50% 50%);
}

#keyhole-bg-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background:
        radial-gradient(ellipse at 30% 40%, rgba(61,139,122,0.05) 0%, transparent 60%),
        radial-gradient(ellipse at 70% 60%, rgba(196,155,60,0.04) 0%, transparent 50%);
}

#hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 40px;
}

/* Keyhole SVG line draw */
#keyhole-line {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 300px;
    opacity: 0;
    z-index: 5;
}

#keyhole-path {
    stroke-dasharray: 1200;
    stroke-dashoffset: 1200;
    animation: drawKeyhole 800ms ease-in-out 400ms forwards;
}

#keyhole-line.animate {
    opacity: 1;
}

@keyframes drawKeyhole {
    to {
        stroke-dashoffset: 0;
    }
}

/* Hero Title */
#hero-title {
    font-family: var(--font-decorative);
    font-size: clamp(48px, 12vw, 96px);
    font-weight: 700;
    color: var(--parchment-glow);
    letter-spacing: 0.15em;
    margin-bottom: 30px;
    position: relative;
    z-index: 10;
}

#hero-title .letter {
    display: inline-block;
    opacity: 0;
    transform: perspective(600px) rotateY(90deg);
    transition: opacity 200ms var(--ease-puzzle), transform 200ms var(--ease-puzzle);
}

#hero-title .letter.visible {
    opacity: 1;
    transform: perspective(600px) rotateY(0deg);
}

/* Hero Riddle */
#hero-riddle {
    font-family: var(--font-body);
    font-size: 19px;
    font-weight: 400;
    color: var(--parchment-glow);
    max-width: 580px;
    margin: 0 auto 40px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 600ms var(--ease-puzzle), transform 600ms var(--ease-puzzle);
    line-height: 1.8;
}

#hero-riddle.visible {
    opacity: 0.85;
    transform: translateY(0);
}

/* Hero Clue */
#hero-clue {
    display: block;
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 0.08em;
    color: var(--patina-verdigris);
    opacity: 0;
    transition: opacity 600ms var(--ease-puzzle);
    animation: clueFlicker 3s ease-in-out infinite 3s;
}

#hero-clue.visible {
    opacity: 0.6;
}

@keyframes clueFlicker {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 0.3; }
}

/* =============================================
   CHAMBER DIVIDERS
   ============================================= */
.chamber-divider {
    position: relative;
    z-index: 15;
    margin-top: -2px;
    margin-bottom: -2px;
    line-height: 0;
}

.divider-svg {
    width: 100%;
    height: 120px;
    display: block;
}

/* =============================================
   CHAMBER 2: The Collection
   ============================================= */
#chamber-collection {
    background-color: var(--smoke-chamber);
}

/* Riddle Grid — Impossible Staircase Layout */
#riddle-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 40px;
}

/* Riddle Cards */
.riddle-card {
    position: relative;
    background: rgba(13, 13, 26, 0.6);
    padding: 36px;
    border: 1px solid transparent;
    overflow: hidden;
    transform: perspective(800px) rotateX(0deg) rotateY(0deg);
    transition: transform 400ms var(--ease-puzzle), box-shadow 400ms var(--ease-puzzle);
    opacity: 0;
    translate: 0 30px;
}

.riddle-card.revealed {
    opacity: 1;
    translate: 0 0;
    transition: opacity 500ms var(--ease-puzzle), translate 500ms var(--ease-puzzle), transform 400ms var(--ease-puzzle), box-shadow 400ms var(--ease-puzzle);
}

/* Staircase offset: each card is offset */
.riddle-card:nth-child(odd) {
    margin-top: 0;
}
.riddle-card:nth-child(even) {
    margin-top: 40px;
}

.riddle-card:hover {
    transform: perspective(800px) rotateX(3deg) rotateY(-2deg);
    box-shadow: 0 4px 20px rgba(196, 155, 60, 0.15);
}

/* Card Border Animation */
.card-border-anim {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    border: 1px solid var(--ghost-line);
    opacity: 0;
    transition: opacity 300ms var(--ease-puzzle);
}

.riddle-card.revealed .card-border-anim {
    opacity: 1;
}

/* Puzzle-piece edge pattern (subtle SVG border) */
.riddle-card::before {
    content: '';
    position: absolute;
    top: -1px;
    left: -1px;
    right: -1px;
    bottom: -1px;
    background-image:
        repeating-linear-gradient(0deg, var(--ghost-line), var(--ghost-line) 8px, transparent 8px, transparent 16px),
        repeating-linear-gradient(90deg, var(--ghost-line), var(--ghost-line) 8px, transparent 8px, transparent 16px);
    background-size: 1px 100%, 100% 1px;
    background-position: 0 0, 0 0;
    background-repeat: repeat-y, repeat-x;
    opacity: 0.12;
    pointer-events: none;
}

.card-number {
    display: block;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--patina-verdigris);
    margin-bottom: 14px;
    line-height: 1.5;
}

.card-title {
    font-family: var(--font-headline);
    font-size: 22px;
    font-weight: 700;
    color: var(--parchment-glow);
    margin-bottom: 14px;
    letter-spacing: 0.02em;
}

.card-text {
    font-family: var(--font-body);
    font-size: 16px;
    color: var(--parchment-glow);
    opacity: 0.75;
    margin-bottom: 20px;
    line-height: 1.7;
}

.card-status {
    display: inline-block;
    font-size: 12px;
    letter-spacing: 0.08em;
    color: var(--amber-cipher);
    padding: 4px 12px;
    border: 1px solid rgba(196, 155, 60, 0.2);
}

/* =============================================
   CHAMBER 3: The Workshop
   ============================================= */
#chamber-workshop {
    background-color: var(--obsidian-ink);
}

.workshop-layout {
    display: flex;
    align-items: flex-start;
    gap: 60px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 120px 40px;
}

.workshop-decor-left,
.workshop-decor-right {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 200px;
}

.impossible-triangle {
    opacity: 0.15;
    animation: slowSpin 60s linear infinite;
}

.impossible-triangle:hover {
    opacity: 0.3;
}

.penrose-square {
    opacity: 0.15;
    animation: slowSpin 60s linear infinite reverse;
}

.penrose-square:hover {
    opacity: 0.3;
}

.workshop-content {
    flex: 1;
    min-width: 0;
}

/* Featured Riddle */
.featured-riddle {
    margin-top: 40px;
}

.featured-title {
    font-family: var(--font-headline);
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 900;
    color: var(--amber-cipher);
    margin-bottom: 40px;
    letter-spacing: 0.03em;
}

.reveal-text {
    margin-bottom: 40px;
}

.reveal-line {
    font-family: var(--font-body);
    font-size: 18px;
    line-height: 1.85;
    color: var(--parchment-glow);
    margin-bottom: 24px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 600ms var(--ease-puzzle), transform 600ms var(--ease-puzzle);
}

.reveal-line.visible {
    opacity: 0.85;
    transform: translateY(0);
}

.featured-meta {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
    font-size: 13px;
    letter-spacing: 0.08em;
    color: var(--patina-verdigris);
    padding-top: 20px;
    border-top: 1px solid var(--ghost-line);
}

/* =============================================
   CHAMBER 4: The Archive
   ============================================= */
#chamber-archive {
    background-color: var(--smoke-chamber);
}

#archive-floors {
    scroll-snap-type: y mandatory;
    overflow-y: auto;
    max-height: none;
}

.archive-floor {
    display: flex;
    align-items: center;
    gap: 40px;
    padding: 50px 40px;
    scroll-snap-align: start;
    border-bottom: 1px solid var(--ghost-line);
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 500ms var(--ease-puzzle), transform 500ms var(--ease-puzzle);
}

.archive-floor.visible {
    opacity: 1;
    transform: translateX(0);
}

.floor-dark {
    background-color: var(--obsidian-ink);
}

.floor-light {
    background-color: var(--smoke-chamber);
}

.floor-number {
    font-family: var(--font-decorative);
    font-size: clamp(36px, 6vw, 72px);
    color: var(--ghost-line);
    mix-blend-mode: overlay;
    opacity: 0.4;
    flex-shrink: 0;
    min-width: 100px;
    text-align: center;
    user-select: none;
}

.floor-content {
    flex: 1;
}

.floor-title {
    font-family: var(--font-headline);
    font-size: 28px;
    font-weight: 700;
    color: var(--parchment-glow);
    margin-bottom: 10px;
    letter-spacing: 0.03em;
}

.floor-desc {
    font-family: var(--font-body);
    font-size: 16px;
    color: var(--parchment-glow);
    opacity: 0.7;
    margin-bottom: 12px;
    max-width: 600px;
    line-height: 1.7;
}

.floor-count {
    font-size: 13px;
    letter-spacing: 0.08em;
    color: var(--patina-verdigris);
}

/* =============================================
   FOOTER
   ============================================= */
#site-footer {
    background-color: var(--obsidian-ink);
    padding: 80px 40px;
    text-align: center;
    border-top: 1px solid var(--ghost-line);
}

.footer-inner {
    max-width: 600px;
    margin: 0 auto;
}

.footer-keyhole {
    display: block;
    margin: 0 auto 20px;
    opacity: 0.25;
}

.footer-text {
    font-size: 14px;
    letter-spacing: 0.05em;
    color: var(--parchment-glow);
    opacity: 0.5;
    margin-bottom: 8px;
}

.footer-year {
    font-size: 13px;
    letter-spacing: 0.12em;
    color: var(--ghost-line);
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 900px) {
    .workshop-layout {
        flex-direction: column;
    }

    .workshop-decor-left,
    .workshop-decor-right {
        display: none;
    }

    .chamber-inner {
        padding: 80px 24px;
    }

    #riddle-grid {
        grid-template-columns: 1fr;
    }

    .riddle-card:nth-child(even) {
        margin-top: 0;
    }

    .archive-floor {
        flex-direction: column;
        gap: 16px;
        padding: 40px 24px;
    }

    .floor-number {
        min-width: auto;
    }

    .featured-meta {
        flex-direction: column;
        gap: 12px;
    }
}

@media (max-width: 600px) {
    #hero-title {
        letter-spacing: 0.08em;
    }

    #hero-riddle {
        font-size: 16px;
    }

    .chamber-inner {
        padding: 60px 16px;
    }

    .riddle-card {
        padding: 24px;
    }

    .divider-svg {
        height: 60px;
    }
}

/* --- Hover transitions for interactive elements --- */
.riddle-card .card-title {
    transition: color 250ms var(--ease-puzzle);
}

.riddle-card:hover .card-title {
    color: var(--amber-cipher);
}

.riddle-card .card-status {
    transition: color 250ms var(--ease-puzzle), border-color 250ms var(--ease-puzzle);
}

.riddle-card:hover .card-status {
    color: var(--riddle-rose);
    border-color: rgba(139, 58, 94, 0.3);
}

.archive-floor {
    transition: opacity 500ms var(--ease-puzzle), transform 500ms var(--ease-puzzle), background-color 250ms var(--ease-puzzle);
}

.archive-floor:hover .floor-title {
    color: var(--amber-cipher);
    transition: color 250ms var(--ease-puzzle);
}

.archive-floor:hover .floor-count {
    color: var(--amber-cipher);
    transition: color 250ms var(--ease-puzzle);
}

/* Impossible geometry hover color change */
.floating-glyph path,
.floating-glyph polygon,
.floating-glyph rect,
.floating-glyph circle,
.floating-glyph line {
    transition: stroke 250ms var(--ease-puzzle);
}

.impossible-triangle path,
.impossible-triangle line,
.penrose-square rect,
.penrose-square line {
    transition: stroke 250ms var(--ease-puzzle);
}

.impossible-triangle:hover path,
.impossible-triangle:hover line {
    stroke: var(--patina-verdigris);
}

.penrose-square:hover rect,
.penrose-square:hover line {
    stroke: var(--patina-verdigris);
}