/* ============================================
   RRIDDL.com - Styles
   Honeyed Neutral Mid-Century Puzzle Design
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --parchment-cream: #F5EDE0;
    --warm-linen: #EDE4D3;
    --tobacco-brown: #3B2F25;
    --walnut: #6B5744;
    --warm-brass: #C8A96E;
    --dark-honey: #B8863A;
    --espresso: #2C1E14;
    --burnt-sienna: #C25E30;
    --grid-line: #E8DFD0;

    --font-display: 'Zilla Slab', serif;
    --font-body: 'Libre Franklin', sans-serif;
    --font-accent: 'Caveat Brush', cursive;
    --font-mono: 'Courier Prime', monospace;

    --gap-desktop: 24px;
    --gap-mobile: 16px;
    --cluster-spacing: 80px;
    --card-radius: 8px;
    --card-border: 2px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--tobacco-brown);
    background: radial-gradient(ellipse at center, var(--parchment-cream) 0%, var(--warm-linen) 100%);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* --- Background Grid Texture --- */
.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background-image:
        linear-gradient(var(--grid-line) 0.5px, transparent 0.5px),
        linear-gradient(90deg, var(--grid-line) 0.5px, transparent 0.5px);
    background-size: 60px 60px;
    opacity: 0.4;
}

/* --- Background Wave Texture --- */
.bg-wave-texture {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.04;
    background-image: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 40px,
        var(--warm-brass) 40px,
        var(--warm-brass) 40.5px
    ),
    repeating-linear-gradient(
        -45deg,
        transparent,
        transparent 40px,
        var(--warm-brass) 40px,
        var(--warm-brass) 40.5px
    );
}

/* --- Hero Section --- */
.hero {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 2rem;
    transition: opacity 0.4s ease-out;
}

.hero.hero-scrolled {
    opacity: 0;
    pointer-events: none;
}

.hero-letters {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5vw;
}

.hero-letter {
    width: 15vw;
    max-width: 180px;
    height: auto;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.hero-letter text {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 130px;
    fill: none;
    stroke: var(--warm-brass);
    stroke-width: 3;
    stroke-dasharray: 600;
    stroke-dashoffset: 600;
    paint-order: stroke;
}

.hero-letter.animate-in {
    opacity: 1;
}

.hero-letter.animate-in text {
    animation: drawLetter 0.5s ease-out forwards;
}

.hero-period text {
    stroke: var(--burnt-sienna);
}

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

.hero-tagline {
    font-family: var(--font-accent);
    font-size: 1.5rem;
    color: var(--dark-honey);
    opacity: 0;
    margin-top: 2rem;
    transform: rotate(-1.5deg);
    transition: opacity 0.6s ease 2.6s;
}

.hero-tagline.visible {
    opacity: 1;
}

.scroll-indicator {
    position: absolute;
    bottom: 3rem;
    opacity: 0;
    transition: opacity 0.6s ease 3s;
    animation: pulseDown 2s ease-in-out infinite;
}

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

.wave-chevron {
    width: 60px;
    height: 30px;
}

@keyframes pulseDown {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* --- Pinned Logo --- */
.pinned-logo {
    position: fixed;
    top: 1.5rem;
    left: 2rem;
    z-index: 100;
    opacity: 0;
    transform: scale(0.8);
    transition: opacity 0.4s ease-out, transform 0.4s ease-out;
    pointer-events: none;
}

.pinned-logo.visible {
    opacity: 1;
    transform: scale(1);
    pointer-events: auto;
}

.pinned-logo-text {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.75rem;
    color: var(--tobacco-brown);
    letter-spacing: -0.02em;
}

.pinned-period {
    color: var(--burnt-sienna);
}

/* --- Card Grid Container --- */
.card-grid-container {
    position: relative;
    z-index: 2;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem 4rem;
}

/* --- Wave Dividers --- */
.wave-divider {
    width: 100%;
    height: 60px;
    margin: var(--cluster-spacing) 0;
    overflow: hidden;
}

.wave-divider svg {
    width: 100%;
    height: 100%;
}

.wave-path.wave-1 {
    animation: waveDrift1 8s linear infinite;
}

.wave-path.wave-2 {
    animation: waveDrift2 11s linear infinite;
}

.wave-path.wave-3 {
    animation: waveDrift3 15s linear infinite;
}

@keyframes waveDrift1 {
    0% { transform: translateX(0); }
    100% { transform: translateX(-20px); }
}

@keyframes waveDrift2 {
    0% { transform: translateX(0); }
    100% { transform: translateX(20px); }
}

@keyframes waveDrift3 {
    0% { transform: translateX(0); }
    100% { transform: translateX(-15px); }
}

/* --- Card Clusters --- */
.card-cluster {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--gap-desktop);
    margin-bottom: 0;
}

/* --- Cards --- */
.card {
    position: relative;
    border: var(--card-border) solid var(--warm-brass);
    border-radius: var(--card-radius);
    background: var(--parchment-cream);
    overflow: hidden;
    perspective: 1000px;
    transform-style: preserve-3d;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card-full {
    grid-column: span 12;
}

.card-medium {
    grid-column: span 6;
}

.card-small {
    grid-column: span 4;
}

/* Card hover effect (when unsealed) */
.card:not(.sealed):hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(200, 169, 110, 0.15);
}

/* --- Sealed Card Face --- */
.card-sealed-face {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--warm-linen);
    z-index: 5;
    cursor: pointer;
    backface-visibility: hidden;
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.6s ease;
}

.card.sealed .card-sealed-face {
    transform: rotateX(0deg);
    opacity: 1;
}

.card:not(.sealed) .card-sealed-face {
    transform: rotateX(90deg);
    opacity: 0;
    pointer-events: none;
}

/* Sealed card hover tremble */
.card.sealed:hover .card-sealed-face {
    animation: tremble 0.2s ease infinite;
}

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

.card-sealed-icon {
    width: 80px;
    height: 80px;
    margin-bottom: 1rem;
}

.card-seal {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--warm-brass);
    position: absolute;
    bottom: 1rem;
    right: 1.25rem;
}

/* Quick unseal (on click) */
.card.quick-unseal .card-sealed-face {
    transition-duration: 0.3s;
}

.card.quick-unseal {
    border-color: var(--burnt-sienna);
    transition: border-color 0.6s ease;
}

/* --- Card Content --- */
.card-content {
    padding: 2.5rem;
    opacity: 0;
    transition: opacity 0.4s ease 0.6s;
    min-height: 200px;
}

.card:not(.sealed) .card-content {
    opacity: 1;
}

.card-full .card-content {
    text-align: center;
    padding: 3.5rem 4rem;
    min-height: 240px;
}

.card-small .card-content {
    padding: 2rem;
    min-height: 160px;
}

/* --- Card Typography --- */
.card-headline {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 2rem;
    letter-spacing: -0.02em;
    color: var(--tobacco-brown);
    margin-bottom: 0.25rem;
    overflow: hidden;
}

.card-full .card-headline {
    font-size: 2.5rem;
}

.card-small .card-headline {
    font-size: 1.5rem;
}

.card h3.card-headline {
    font-size: 1.5rem;
}

/* Card wave underline */
.card-wave-underline {
    width: 60px;
    height: 8px;
    margin: 0.75rem 0 1.25rem;
}

.card-full .card-wave-underline {
    margin: 0.75rem auto 1.25rem;
}

.card-wave-underline svg {
    width: 100%;
    height: 100%;
}

.card-body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--tobacco-brown);
}

.card-hint {
    font-family: var(--font-accent);
    font-size: 1.35rem;
    color: var(--dark-honey);
    transform: rotate(-1deg);
    line-height: 1.5;
}

/* --- Answer Reveal --- */
.answer-reveal {
    margin-top: 1.5rem;
    position: relative;
}

.reveal-btn {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 0.9375rem;
    color: var(--dark-honey);
    background: none;
    border: 1.5px solid var(--warm-brass);
    border-radius: 4px;
    padding: 0.5rem 1.25rem;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: color 0.3s ease, border-color 0.3s ease, background-color 0.3s ease;
}

.reveal-btn:hover {
    color: var(--parchment-cream);
    background-color: var(--dark-honey);
    border-color: var(--dark-honey);
}

.answer-text {
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    transition: max-height 0.5s ease, opacity 0.4s ease 0.1s, margin-top 0.3s ease;
    margin-top: 0;
}

.answer-text.revealed {
    max-height: 100px;
    opacity: 1;
    margin-top: 1rem;
}

.answer-content {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 1rem;
    letter-spacing: 0.04em;
    color: var(--burnt-sienna);
    display: block;
    padding: 0.75rem 1rem;
    background: var(--warm-linen);
    border-radius: 4px;
    border-left: 3px solid var(--burnt-sienna);
}

/* --- Dark Card Variant --- */
.card-dark {
    background: var(--espresso);
    border-color: var(--warm-brass);
}

.card-dark .card-sealed-face {
    background: var(--espresso);
}

.card-dark .card-content {
    color: var(--parchment-cream);
}

.card-dark .card-headline,
.card-dark .card-body {
    color: var(--parchment-cream);
}

.card-quote {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 2rem;
    line-height: 1.4;
    color: var(--warm-brass);
    margin-bottom: 1rem;
}

.card-attribution {
    font-family: var(--font-body);
    font-size: 0.9375rem;
    color: var(--walnut);
    opacity: 0.8;
}

.card-attribution em {
    font-style: italic;
}

.card-aside {
    font-family: var(--font-accent);
    font-size: 1.25rem;
    color: var(--burnt-sienna);
    margin-top: 1rem;
    transform: rotate(1.5deg);
}

.card-aside-text {
    font-family: var(--font-accent);
    font-size: 1.35rem;
    color: var(--dark-honey);
    margin-top: 1.5rem;
    transform: rotate(-0.5deg);
}

/* --- Footer --- */
.site-footer {
    background: var(--espresso);
    padding: 4rem 2rem;
    text-align: center;
    position: relative;
    z-index: 2;
    margin-top: var(--cluster-spacing);
}

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

.footer-logo {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 2rem;
    color: var(--warm-brass);
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

.footer-period {
    color: var(--burnt-sienna);
}

.footer-tagline {
    font-family: var(--font-accent);
    font-size: 1.125rem;
    color: var(--walnut);
    margin-bottom: 1.5rem;
}

.footer-wave {
    width: 120px;
    height: 20px;
    margin: 0 auto 1.5rem;
}

.footer-wave svg {
    width: 100%;
    height: 100%;
}

.footer-copy {
    font-family: var(--font-body);
    font-size: 0.8125rem;
    color: var(--walnut);
    opacity: 0.6;
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
    .hero-letter text {
        stroke-dashoffset: 0;
        animation: none;
    }

    .hero-letter {
        opacity: 1;
    }

    .hero-tagline {
        opacity: 1;
        transition: none;
    }

    .scroll-indicator {
        opacity: 1;
        animation: none;
    }

    .card.sealed .card-sealed-face {
        transform: none;
        opacity: 0;
    }

    .card-sealed-face {
        transition: none;
        animation: none;
    }

    .card-content {
        opacity: 1;
        transition: none;
    }

    .card.sealed {
        /* Cards appear unsealed by default */
    }

    .wave-path {
        animation: none;
    }

    .card:not(.sealed):hover {
        transform: none;
    }

    @keyframes tremble {
        0%, 100% { transform: none; }
    }
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .card-medium {
        grid-column: span 6;
    }

    .card-small {
        grid-column: span 6;
    }

    .hero-letter {
        width: 12vw;
    }

    .card-quote {
        font-size: 1.75rem;
    }
}

@media (max-width: 768px) {
    .card-cluster {
        gap: var(--gap-mobile);
    }

    .card-medium {
        grid-column: span 12;
    }

    .card-small {
        grid-column: span 12;
    }

    .hero-letter {
        width: 13vw;
    }

    .card-full .card-content {
        padding: 2.5rem 2rem;
    }

    .card-headline {
        font-size: 1.75rem;
    }

    .card-full .card-headline {
        font-size: 2rem;
    }

    .card-quote {
        font-size: 1.5rem;
    }

    .pinned-logo {
        top: 1rem;
        left: 1.25rem;
    }

    .pinned-logo-text {
        font-size: 1.25rem;
    }

    .card-grid-container {
        padding: 0 1rem 3rem;
    }

    .wave-divider {
        margin: 40px 0;
    }
}

@media (max-width: 480px) {
    .hero-letter {
        width: 14vw;
    }

    .hero-tagline {
        font-size: 1.125rem;
    }

    .card-content {
        padding: 1.5rem;
    }

    .card-small .card-content {
        padding: 1.5rem;
    }
}