/* ============================================================
   RRIDDL.com - Avant-Garde Luxury / Marble meets Neon
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
    --bg-deep: #1a1518;
    --bg-warm: #1e1820;
    --bg-warmer: #221a22;
    --marble-cream: #f5f0eb;
    --marble-mid: #e8e0d8;
    --marble-dark: #d9cfc5;
    --neon-coral: #e8734a;
    --neon-amber: #f5a623;
    --neon-rose: #c94c6d;
    --text-parchment: #f0e6dc;
    --text-dark: #3d2f35;
    --accent-gold: #b8956a;
    --shadow-warm: #d4805b;
    --scroll-warmth: #1a1518;
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'DM Sans', Helvetica, Arial, sans-serif;
    --font-accent: 'Bodoni Moda', 'Playfair Display', Georgia, serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--scroll-warmth);
    color: var(--text-parchment);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.65;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- SVG Marble Noise Filter (hidden) --- */
svg.marble-filter {
    position: absolute;
    width: 0;
    height: 0;
    pointer-events: none;
}

/* --- Particles --- */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--neon-coral), var(--neon-amber), var(--neon-rose));
    opacity: 0.25;
    will-change: transform;
    animation: particle-drift var(--drift-duration, 10s) ease-in-out infinite;
    animation-delay: var(--drift-delay, 0s);
}

@keyframes particle-drift {
    0% { transform: translateY(0) translateX(0); }
    25% { transform: translateY(-20px) translateX(10px); }
    50% { transform: translateY(-40px) translateX(-5px); }
    75% { transform: translateY(-20px) translateX(-10px); }
    100% { transform: translateY(0) translateX(0); }
}

/* --- Hero Section --- */
.hero {
    position: relative;
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    z-index: 2;
}

/* Hero Light Orb */
.hero-light {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--neon-coral) 0%, rgba(232, 115, 74, 0.4) 40%, transparent 70%);
    opacity: 0;
    z-index: 3;
    pointer-events: none;
    will-change: transform, opacity, width, height;
}

.hero-light.animate {
    animation: light-expand 1200ms ease-out forwards;
    animation-delay: 600ms;
}

@keyframes light-expand {
    0% {
        opacity: 1;
        width: 8px;
        height: 8px;
    }
    100% {
        opacity: 0.6;
        width: 600px;
        height: 600px;
    }
}

.hero-light.disperse {
    animation: light-disperse 1000ms ease-in forwards;
}

@keyframes light-disperse {
    0% {
        opacity: 0.6;
        width: 600px;
        height: 600px;
        transform: translate(-50%, -50%);
    }
    100% {
        opacity: 0;
        width: 800px;
        height: 800px;
        transform: translate(-50%, -120%);
    }
}

/* Hero Wordmark */
.hero-wordmark {
    font-family: var(--font-accent);
    font-size: 120px;
    font-weight: 900;
    letter-spacing: 0.08em;
    background: linear-gradient(135deg, var(--neon-coral) 0%, var(--neon-amber) 45%, var(--neon-rose) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    z-index: 4;
    position: relative;
    user-select: none;
}

.hero-wordmark .letter {
    display: inline-block;
    opacity: 0;
    transform: translateY(30px) rotate(3deg);
    transition: none;
}

.hero-wordmark .letter.visible {
    opacity: 1;
    transform: translateY(0) rotate(0deg);
    transition: opacity 600ms cubic-bezier(0.23, 1, 0.32, 1),
                transform 600ms cubic-bezier(0.23, 1, 0.32, 1);
    transition-delay: calc(var(--i) * 100ms);
}

/* Hero Tagline */
.hero-tagline {
    font-family: var(--font-body);
    font-size: 18px;
    font-weight: 400;
    color: var(--accent-gold);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-top: 24px;
    opacity: 0;
    transform: translateY(20px);
    z-index: 4;
    position: relative;
}

.hero-tagline.visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 800ms ease, transform 800ms ease;
}

/* Hero Card */
.hero-card {
    position: relative;
    width: 400px;
    max-width: 90vw;
    min-height: 300px;
    margin-top: 60px;
    border-radius: 16px;
    overflow: hidden;
    cursor: pointer;
    z-index: 4;
    opacity: 0;
    transform: translateY(60px);
    transition: transform 500ms cubic-bezier(0.34, 1.56, 0.64, 1),
                box-shadow 600ms ease;
}

.hero-card.visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 800ms ease, transform 800ms ease,
                box-shadow 600ms ease;
}

.hero-card.visible:hover {
    transform: translateY(-24px) scale(1.03);
    box-shadow: 0 0 48px rgba(232, 115, 74, 0.3),
                0 0 96px rgba(245, 166, 35, 0.15);
}

.hero-card.visible:hover .card-marble {
    opacity: 0.3;
}

.hero-card.visible:hover .card-content {
    opacity: 1;
}

.hero-card.visible:hover .card-glyph {
    transform: translate(-50%, -50%) rotate(180deg);
}

.hero-card.visible:hover .card-glow {
    opacity: 1;
}

/* Scroll Chevron */
.scroll-chevron {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 4;
    opacity: 0;
    animation: chevron-bounce 2s ease-in-out infinite;
}

.scroll-chevron.visible {
    opacity: 1;
}

@keyframes chevron-bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

/* --- Card Common Styles --- */
.card-marble {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse at 20% 30%, var(--marble-cream) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 60%, var(--marble-mid) 0%, transparent 40%),
        radial-gradient(ellipse at 50% 80%, var(--marble-dark) 0%, transparent 60%),
        var(--marble-cream);
    border-radius: 16px;
    z-index: 2;
    transition: opacity 400ms ease;
    display: flex;
    align-items: center;
    justify-content: center;
    filter: url(#marbleNoise);
}

.card-glyph {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: transform 800ms cubic-bezier(0.23, 1, 0.32, 1);
    opacity: 0.7;
}

.card-content {
    position: relative;
    z-index: 1;
    padding: 40px 32px;
    opacity: 0;
    transition: opacity 400ms ease;
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: 100%;
}

.card-title {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-parchment);
    text-shadow: 2px 2px 4px rgba(232, 115, 74, 0.3);
    margin-bottom: 16px;
}

.card-text {
    font-family: var(--font-body);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.65;
    color: var(--text-parchment);
}

.card-glow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 16px;
    pointer-events: none;
    z-index: 0;
    opacity: 0;
    transition: opacity 600ms ease;
    background: linear-gradient(135deg,
        rgba(232, 115, 74, 0.15) 0%,
        rgba(245, 166, 35, 0.1) 45%,
        rgba(201, 76, 109, 0.1) 100%);
    box-shadow:
        0 0 60px rgba(232, 115, 74, 0.2),
        0 0 120px rgba(245, 166, 35, 0.1);
}

/* --- Veining Lines (decorative SVG accents on cards) --- */
.marble-vein {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 3;
}

.marble-vein path {
    stroke: var(--accent-gold);
    stroke-width: 0.5;
    fill: none;
    stroke-dasharray: 500;
    stroke-dashoffset: 500;
    transition: stroke-dashoffset 2s ease;
}

.riddle-card.visible .marble-vein path,
.hero-card.visible .marble-vein path {
    stroke-dashoffset: 0;
}

/* --- Neon Section --- */
.neon-section {
    position: relative;
    width: 100%;
    padding: 120px 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
    overflow: hidden;
}

.neon-text {
    font-family: var(--font-accent);
    font-size: 96px;
    font-weight: 900;
    color: var(--text-parchment);
    text-align: center;
    text-shadow:
        0 0 4px rgba(232, 115, 74, 0.8),
        0 0 8px rgba(232, 115, 74, 0.6),
        0 0 16px rgba(232, 115, 74, 0.4),
        0 0 32px rgba(245, 166, 35, 0.3),
        0 0 40px rgba(201, 76, 109, 0.2);
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 700ms ease, transform 700ms ease;
    letter-spacing: 0.06em;
}

.neon-text.visible {
    opacity: 1;
    transform: translateY(0);
    animation: glow-breathe 4s ease-in-out infinite;
}

@keyframes glow-breathe {
    0%, 100% {
        text-shadow:
            0 0 4px rgba(232, 115, 74, 0.6),
            0 0 8px rgba(232, 115, 74, 0.4),
            0 0 16px rgba(232, 115, 74, 0.3),
            0 0 32px rgba(245, 166, 35, 0.2),
            0 0 40px rgba(201, 76, 109, 0.15);
    }
    50% {
        text-shadow:
            0 0 4px rgba(232, 115, 74, 1),
            0 0 12px rgba(232, 115, 74, 0.8),
            0 0 24px rgba(232, 115, 74, 0.5),
            0 0 48px rgba(245, 166, 35, 0.4),
            0 0 64px rgba(201, 76, 109, 0.3);
    }
}

.neon-finale {
    padding: 160px 40px;
}

.neon-finale .neon-text {
    font-size: 64px;
}

/* --- Card Grid Section --- */
.card-grid-section {
    position: relative;
    z-index: 2;
    padding: 40px 80px 120px;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    grid-auto-rows: minmax(280px, auto);
    gap: 24px;
    max-width: 1400px;
    margin: 0 auto;
}

/* Card Grid Items */
.riddle-card {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    cursor: pointer;
    background: var(--bg-deep);
    box-shadow: 0 8px 16px rgba(212, 128, 91, 0.15);
    opacity: 0;
    transform: translateY(60px);
    transition: transform 500ms cubic-bezier(0.34, 1.56, 0.64, 1),
                box-shadow 600ms ease,
                opacity 400ms ease;
    will-change: transform, box-shadow;
}

.riddle-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.riddle-card.hover-lift {
    transform: translateY(-24px) scale(1.03);
    box-shadow:
        0 0 48px rgba(232, 115, 74, 0.3),
        0 0 96px rgba(245, 166, 35, 0.15);
}

.riddle-card.hover-lift .card-marble {
    opacity: 0.3;
    box-shadow: inset 0 0 30px rgba(232, 115, 74, 0.1);
}

.riddle-card.hover-lift .card-content {
    opacity: 1;
}

.riddle-card.hover-lift .card-glyph {
    transform: translate(-50%, -50%) rotate(180deg);
}

.riddle-card.hover-lift .card-glow {
    opacity: 1;
}

/* Adjacent cards retreat */
.riddle-card.adjacent-retreat {
    transform: translateY(4px) !important;
    opacity: 0.85 !important;
    transition: transform 300ms ease, opacity 300ms ease !important;
}

/* Spanning classes */
.span-2-col {
    grid-column: span 2;
}

.span-2-row {
    grid-row: span 2;
}

/* Dimmed state when a card is expanded */
.riddle-card.dimmed {
    opacity: 0.2 !important;
    transition: opacity 300ms ease !important;
    pointer-events: none;
}

/* --- Card Overlay (Expanded) --- */
.card-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    opacity: 0;
    transition: opacity 300ms ease;
    background: rgba(26, 21, 24, 0.85);
}

.card-overlay.active {
    pointer-events: auto;
    opacity: 1;
}

.card-overlay-content {
    position: relative;
    width: 80vw;
    max-width: 900px;
    max-height: 80vh;
    background: var(--bg-deep);
    border-radius: 20px;
    overflow-y: auto;
    border: 1px solid rgba(184, 149, 106, 0.3);
    box-shadow:
        0 0 60px rgba(232, 115, 74, 0.3),
        0 0 120px rgba(245, 166, 35, 0.15),
        0 0 200px rgba(201, 76, 109, 0.1);
    transform: scale(0.9);
    transition: transform 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.card-overlay.active .card-overlay-content {
    transform: scale(1);
}

.overlay-inner {
    padding: 60px 48px;
}

.overlay-inner .card-title {
    font-size: 42px;
    margin-bottom: 24px;
}

.overlay-inner .card-text {
    font-size: 18px;
    line-height: 1.8;
}

.card-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    background: none;
    border: 1px solid rgba(184, 149, 106, 0.4);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: background 200ms ease, border-color 200ms ease;
}

.card-close:hover {
    background: rgba(184, 149, 106, 0.15);
    border-color: var(--accent-gold);
}

/* Neon border for overlay */
.card-overlay.active .card-overlay-content::before {
    content: '';
    position: absolute;
    top: -1px;
    left: -1px;
    right: -1px;
    bottom: -1px;
    border-radius: 21px;
    background: linear-gradient(135deg, var(--neon-coral), var(--neon-amber), var(--neon-rose));
    z-index: -1;
    opacity: 0.4;
    animation: glow-breathe-border 4s ease-in-out infinite;
}

@keyframes glow-breathe-border {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.5; }
}

/* --- Responsive: Mobile --- */
@media (max-width: 768px) {
    .hero-wordmark {
        font-size: 48px;
    }

    .hero-tagline {
        font-size: 14px;
        letter-spacing: 0.1em;
    }

    .hero-card {
        width: 90vw;
        min-height: 240px;
        margin-top: 40px;
    }

    .card-grid-section {
        padding: 24px 20px 80px;
    }

    .card-grid {
        grid-template-columns: 1fr;
        grid-auto-rows: minmax(240px, auto);
        gap: 20px;
    }

    .span-2-col {
        grid-column: span 1;
    }

    .span-2-row {
        grid-row: span 1;
    }

    .neon-text {
        font-size: 48px;
    }

    .neon-finale .neon-text {
        font-size: 36px;
    }

    .neon-section {
        padding: 80px 24px;
    }

    .neon-finale {
        padding: 100px 24px;
    }

    .card-title {
        font-size: 22px;
    }

    .card-content {
        padding: 28px 24px;
    }

    .card-overlay-content {
        width: 94vw;
        max-height: 90vh;
    }

    .overlay-inner {
        padding: 40px 24px;
    }

    .overlay-inner .card-title {
        font-size: 28px;
    }

    .overlay-inner .card-text {
        font-size: 16px;
    }

    .scroll-chevron {
        bottom: 24px;
    }
}

@media (max-width: 480px) {
    .hero-wordmark {
        font-size: 40px;
    }

    .neon-text {
        font-size: 32px;
    }

    .neon-finale .neon-text {
        font-size: 24px;
    }
}