/* ppuzzl.bar — brutalist puzzle archive
   Design typography tokens: "Cormorant Garamond" (Google Fonts), "Space Grotesk" (Google Fonts), "IBM Plex Mono" (Google Fonts). Card-Flip Interaction System* System:** */

:root {
    --bg-parchment: #f4efe6;
    --text-carbon: #2b2b2b;
    --accent-sage: #6b8f71;
    --accent-foxing: #8b5e3c;
    --accent-violet: #3d1f5c;
    --dark-pine: #1a3a2a;
    --border-gold: #c4b896;
    --space-void: 20vh;
    --card-shadow: 2px 3px 0px var(--border-gold);
    --border-thin: 1px solid var(--accent-foxing);
    --border-heavy: 4px solid var(--text-carbon);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    overflow-x: hidden;
    color: var(--text-carbon);
    background-color: var(--bg-parchment);
    font-family: "Space Grotesk", Inter, sans-serif;
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    font-weight: 400;
    line-height: 1.75;
    letter-spacing: 0.01em;
    scroll-snap-type: y proximity;
    background-image:
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180' viewBox='0 0 180 180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.72' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='matrix' values='.19 0 0 0 0 0 .17 0 0 0 0 0 .13 0 0 0 0 0 .16 0'/%3E%3C/filter%3E%3Crect width='180' height='180' fill='%23f4efe6'/%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.55'/%3E%3C/svg%3E"),
        radial-gradient(circle at 23% 67%, rgba(139, 94, 60, 0.08) 0%, transparent 3%),
        radial-gradient(circle at 81% 19%, rgba(139, 94, 60, 0.06) 0%, transparent 2.5%),
        radial-gradient(circle at 15% 45%, rgba(139, 94, 60, 0.05) 0%, transparent 2%),
        radial-gradient(circle at 72% 88%, rgba(139, 94, 60, 0.07) 0%, transparent 3%),
        radial-gradient(circle at 43% 12%, rgba(139, 94, 60, 0.04) 0%, transparent 2%),
        radial-gradient(circle at 91% 61%, rgba(139, 94, 60, 0.06) 0%, transparent 2.5%),
        radial-gradient(circle at 11% 78%, rgba(139, 94, 60, 0.05) 0%, transparent 2.2%),
        radial-gradient(circle at 67% 34%, rgba(139, 94, 60, 0.07) 0%, transparent 2.8%),
        radial-gradient(circle at 54% 71%, rgba(139, 94, 60, 0.04) 0%, transparent 2%),
        radial-gradient(circle at 38% 89%, rgba(139, 94, 60, 0.06) 0%, transparent 2.5%),
        radial-gradient(circle at 84% 44%, rgba(139, 94, 60, 0.05) 0%, transparent 2.2%),
        radial-gradient(circle at 29% 26%, rgba(139, 94, 60, 0.08) 0%, transparent 3%),
        radial-gradient(circle at 76% 6%, rgba(139, 94, 60, 0.04) 0%, transparent 1.8%),
        radial-gradient(circle at 6% 52%, rgba(139, 94, 60, 0.07) 0%, transparent 2.8%),
        radial-gradient(circle at 59% 95%, rgba(139, 94, 60, 0.06) 0%, transparent 2.5%);
    background-attachment: fixed;
}

.paper-field {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background:
        linear-gradient(90deg, transparent 0 24.85%, rgba(139, 94, 60, 0.14) 24.95% 25%, transparent 25.1% 74.85%, rgba(139, 94, 60, 0.14) 74.95% 75%, transparent 75.1%),
        repeating-linear-gradient(0deg, transparent 0 95px, rgba(196, 184, 150, 0.16) 96px, transparent 97px);
    mix-blend-mode: multiply;
}

.main-grid {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    min-height: 100vh;
}

.gutter {
    position: relative;
    min-height: 100%;
}

.gutter-left { border-right: 1px solid rgba(139, 94, 60, 0.18); }
.gutter-right { border-left: 1px solid rgba(139, 94, 60, 0.18); }

.gutter-rule {
    position: sticky;
    width: 42%;
    height: 1px;
    margin-left: 22%;
    background: rgba(139, 94, 60, 0.28);
}

.rule-one { top: 20vh; }
.rule-two { top: 64vh; margin-top: 120vh; }
.rule-three { top: 38vh; margin: 160vh 0 0 35%; }

.margin-note {
    position: sticky;
    top: 72vh;
    margin: 58vh 2rem 0;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.68rem;
    font-weight: 300;
    color: rgba(107, 143, 113, 0.65);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    writing-mode: vertical-rl;
}

.note-two {
    top: 18vh;
    margin-left: auto;
    margin-right: 2rem;
}

.content-column {
    display: flex;
    flex-direction: column;
    gap: var(--space-void);
    padding: 0 3rem var(--space-void);
}

h1, h2, h3 {
    font-family: "Cormorant Garamond", serif;
    font-weight: 600;
    line-height: 1.15;
    letter-spacing: 0.02em;
}

h1 { font-size: clamp(2.8rem, 5vw, 5rem); }
h2 { margin-bottom: 1.6rem; font-size: clamp(2.8rem, 5vw, 5rem); }
h3 { margin-bottom: 1.25rem; font-size: clamp(2rem, 3.6vw, 3.8rem); }

p + p { margin-top: 1.2rem; }

.annotation, .pretitle {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.75rem;
    font-weight: 300;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent-sage);
}

.card {
    position: sticky;
    top: 10vh;
    z-index: var(--stack);
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    scroll-snap-align: start;
    perspective: 1200px;
    opacity: 0.3;
    transform: translateY(2vh);
    transition: opacity 600ms ease-out, transform 600ms ease-out;
}

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

.card::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background: linear-gradient(135deg, rgba(107, 143, 113, 0.08) 0%, rgba(61, 31, 92, 0.06) 50%, rgba(107, 143, 113, 0.04) 100%);
    opacity: 0.3;
    animation: aurora 20s ease-in-out infinite;
}

.card-face {
    position: relative;
    width: 100%;
    padding: clamp(2rem, 5vw, 4.5rem);
    background-color: rgba(244, 239, 230, 0.94);
    border-top: 1px solid rgba(139, 94, 60, 0.2);
    border-bottom: var(--border-thin);
    box-shadow: var(--card-shadow);
}

.card-face::after {
    content: "";
    position: absolute;
    left: clamp(2rem, 5vw, 4.5rem);
    right: clamp(2rem, 5vw, 4.5rem);
    top: 38%;
    height: 1px;
    background: rgba(139, 94, 60, 0.18);
}

.card-intro {
    top: 0;
    min-height: 100vh;
    text-align: center;
}

.card-intro .card-face {
    padding: 0;
    background: transparent;
    border: 0;
    box-shadow: none;
}

.card-intro .card-face::after { display: none; }

.domain-title {
    font-size: clamp(4.2rem, 9vw, 9rem);
    letter-spacing: 0.05em;
}

.stamp-mark {
    display: inline-block;
    margin-bottom: 2rem;
    padding: 0.42rem 0.7rem;
    border: 1px solid var(--accent-sage);
    outline: 2px solid var(--accent-sage);
    outline-offset: 3px;
    color: var(--accent-sage);
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.75rem;
    font-weight: 300;
    letter-spacing: 0.08em;
    line-height: 1.1;
    text-transform: uppercase;
    opacity: 0.8;
    transform: rotate(-2deg);
}

.stamp-mark.inverse {
    color: var(--bg-parchment);
    border-color: rgba(244, 239, 230, 0.75);
    outline-color: rgba(244, 239, 230, 0.75);
}

.card-offset-right { justify-content: flex-end; }
.card-offset-left { justify-content: flex-start; }
.card-offset-right .card-face, .card-offset-left .card-face { max-width: 84%; }
.narrow-card .card-face { max-width: 72%; }

.ruled-copy {
    padding-top: 1.25rem;
    border-top: 1px solid rgba(139, 94, 60, 0.2);
}

.flip-plane {
    position: relative;
    width: 100%;
    min-height: 68vh;
    transform-style: preserve-3d;
    transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-puzzle.flipped .flip-plane {
    transform: rotateY(180deg);
}

.flip-plane .card-face {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    backface-visibility: hidden;
}

.card-back {
    color: var(--bg-parchment);
    background-color: var(--dark-pine);
    transform: rotateY(180deg);
    border-color: rgba(244, 239, 230, 0.25);
    box-shadow: 2px 3px 0px var(--accent-violet), inset 0 0 0 1px rgba(244, 239, 230, 0.18);
    background-image: linear-gradient(135deg, rgba(107, 143, 113, 0.28) 0%, rgba(61, 31, 92, 0.4) 48%, rgba(107, 143, 113, 0.18) 100%);
}

.card-back::after { background: rgba(244, 239, 230, 0.14); }

.card-flip-prompt, .card-return {
    align-self: flex-start;
    margin-top: 1.5rem;
    padding: 0.85rem 1rem;
    border: 0;
    border-top: var(--border-thin);
    border-bottom: var(--border-thin);
    color: var(--accent-violet);
    background: transparent;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.82rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    cursor: pointer;
}

.card-return {
    color: var(--bg-parchment);
    border-color: rgba(244, 239, 230, 0.55);
}

.diagram {
    position: relative;
    width: min(100%, 420px);
    min-height: 92px;
    margin: 0.25rem 0 1.7rem;
    border: var(--border-heavy);
    background: rgba(196, 184, 150, 0.16);
}

.grate-diagram {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
    padding: 10px;
}

.grate-diagram span { background: var(--accent-foxing); }

.clock-diagram {
    height: 116px;
    background:
        linear-gradient(90deg, transparent 49%, var(--text-carbon) 49% 51%, transparent 51%),
        linear-gradient(180deg, transparent 49%, rgba(139, 94, 60, 0.5) 49% 51%, transparent 51%),
        rgba(196, 184, 150, 0.16);
}

.clock-diagram span {
    position: absolute;
    left: 28%;
    right: 28%;
    top: 18%;
    bottom: 18%;
    border: 1px solid var(--accent-sage);
}

.cipher-diagram, .door-diagram {
    display: grid;
    align-items: center;
    justify-items: center;
    grid-template-columns: repeat(5, 1fr);
    font-family: "IBM Plex Mono", monospace;
    color: var(--accent-violet);
}

.door-diagram { grid-template-columns: repeat(7, 1fr); }
.door-diagram span { border-left: 1px solid var(--accent-foxing); padding: 1.5rem 0; width: 100%; text-align: center; }

.card-final { margin-bottom: 30vh; text-align: center; }
.card-final .card-face { max-width: 82%; }

.scroll-markers {
    position: fixed;
    z-index: 20;
    left: 1.5rem;
    top: 50%;
    display: flex;
    flex-direction: column;
    gap: 2.6rem;
    transform: translateY(-50%);
    pointer-events: none;
}

.marker {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.7rem;
    font-weight: 300;
    color: rgba(107, 143, 113, 0.38);
    letter-spacing: 0.08em;
    transition: color 300ms ease-out, transform 300ms ease-out;
}

.marker.active {
    color: var(--accent-sage);
    transform: translateX(0.35rem);
}

.reveal-text .char {
    display: inline-block;
    opacity: 0;
    transform: translateY(0.22em);
}

.visible .reveal-text .char {
    animation: press-letter 420ms ease-out forwards;
    animation-delay: calc(var(--char-index) * 30ms);
}

@keyframes press-letter {
    to { opacity: 1; transform: translateY(0); }
}

@keyframes aurora {
    0% { opacity: 0.3; transform: translateX(-5%); }
    50% { opacity: 0.6; transform: translateX(5%); }
    100% { opacity: 0.3; transform: translateX(-5%); }
}

@media (max-width: 1200px) {
    .main-grid { grid-template-columns: 1fr; }
    .gutter { display: none; }
    .content-column { padding: 0 2rem var(--space-void); }
    .scroll-markers { display: none; }
    .card-offset-right .card-face, .card-offset-left .card-face, .narrow-card .card-face { max-width: 100%; }
}

@media (max-width: 760px) {
    .content-column { gap: 15vh; padding-inline: 1rem; }
    .card { position: relative; top: auto; min-height: 80vh; padding: 1rem 0; }
    .card-face { padding: 1.6rem; }
    .card-face::after { left: 1.6rem; right: 1.6rem; }
    .flip-plane { min-height: 76vh; }
    h2 { font-size: clamp(2rem, 12vw, 3.2rem); }
    h3 { font-size: clamp(1.8rem, 10vw, 2.6rem); }
    .domain-title { font-size: clamp(3rem, 16vw, 5rem); }
}