/* ==========================================================================
   simulai.dev — pastoral simulation garden
   Dawn-to-dusk vertical descent through six biomes.
   ========================================================================== */

:root {
    --c-dawn-sky:        #F2E8DF; /* Parchment Mist */
    --c-morning-wash:    #D4C5B2; /* Linen Haze */
    --c-meadow-blush:    #C2A68C; /* Dried Rose Clay */
    --c-leaf-vein:       #6B8F71; /* Sage Hollow */
    --c-brook-depth:     #3D6B7E; /* Slate Creek */
    --c-twilight-ink:    #2C3E50; /* Dusk Indigo */
    --c-night-loam:      #1A1A2E; /* Midnight Soil */
    --c-glow-lichen:     #A8D5BA; /* Phosphor Moss */

    --font-mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, monospace;
    --font-display: 'Cormorant Garamond', 'Cormorant', Georgia, serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-mono);
    font-weight: 300;
    color: var(--c-twilight-ink);
    line-height: 1.75;
    overflow-x: hidden;
    background: linear-gradient(
        180deg,
        #F2E8DF 0%,
        #D4C5B2 15%,
        #C2A68C 30%,
        #6B8F71 45%,
        #3D6B7E 60%,
        #2C3E50 80%,
        #1A1A2E 100%
    );
    background-attachment: fixed;
    min-height: 100vh;
}

/* ---- Grain / Noise overlay -------------------------------------------- */
.grain-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.06;
    mix-blend-mode: multiply;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='120' height='120'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)' opacity='0.7'/></svg>");
}

/* ==========================================================================
   Layout: biome stack
   ========================================================================== */

.biome-stack {
    display: block;
    width: 100%;
}

.biome {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: clamp(2.5rem, 8vh, 6rem) clamp(1.5rem, 6vw, 5rem);
    overflow: hidden;
}

.biome-label {
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.75rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    opacity: 0.75;
    margin-bottom: 1rem;
}

.biome-heading {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(1.6rem, 3.4vw, 2.6rem);
    letter-spacing: 0.04em;
    line-height: 1.2;
    margin-bottom: 2.5rem;
    text-align: center;
}

/* ==========================================================================
   Section 1: Canopy
   ========================================================================== */

.biome--canopy {
    background:
        radial-gradient(ellipse at 20% 10%, rgba(212, 197, 178, 0.5) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 30%, rgba(168, 213, 186, 0.25) 0%, transparent 55%),
        radial-gradient(ellipse at 50% 80%, rgba(194, 166, 140, 0.35) 0%, transparent 65%),
        linear-gradient(180deg, #F2E8DF 0%, #ECE0D2 60%, #D4C5B2 100%);
}

.param-texture {
    position: absolute;
    inset: 0;
    display: flex;
    flex-wrap: wrap;
    align-content: flex-start;
    gap: 1.4rem 2.5rem;
    padding: 2rem;
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 0.6rem;
    letter-spacing: 0.05em;
    color: var(--c-twilight-ink);
    opacity: 0.05;
    pointer-events: none;
    user-select: none;
}

.canopy-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
}

.site-title {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(3rem, 8vw, 6.5rem);
    letter-spacing: 0.06em;
    line-height: 1;
    color: var(--c-twilight-ink);
    margin-bottom: 1.5rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fade-rise 1.5s ease-out 0.4s forwards;
}

.canopy-tagline {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: clamp(0.875rem, 1.2vw, 1.05rem);
    line-height: 1.75;
    color: var(--c-twilight-ink);
    max-width: 36rem;
    margin: 0 auto 1.25rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fade-rise 1.5s ease-out 1.0s forwards;
}

.canopy-meta {
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--c-meadow-blush);
    opacity: 0;
    animation: fade-rise 1.5s ease-out 1.6s forwards;
}

.canopy-waves {
    position: absolute;
    bottom: 0;
    left: -10vw;
    width: 120vw;
    height: 200px;
    pointer-events: none;
    z-index: 1;
}

.ambient-wave {
    position: absolute;
    left: 0;
    width: 100%;
    height: 100%;
    fill: none;
    stroke-linecap: round;
}

.ambient-wave path {
    fill: none;
}

.ambient-wave--canopy {
    bottom: 80px;
    stroke: var(--c-leaf-vein);
    stroke-width: 1.5;
    opacity: 0.3;
    animation: wave-drift-slow 22s linear infinite;
}

.ambient-wave--canopy path {
    stroke: inherit;
    stroke-width: inherit;
    fill: none;
}

.ambient-wave--canopy.two {
    bottom: 50px;
    stroke: var(--c-meadow-blush);
    stroke-width: 1.2;
    opacity: 0.25;
    animation-duration: 28s;
}

.ambient-wave--canopy.three {
    bottom: 20px;
    stroke: var(--c-twilight-ink);
    stroke-width: 1;
    opacity: 0.15;
    animation-duration: 36s;
    stroke-dasharray: 20 40;
}

@keyframes fade-rise {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes wave-drift-slow {
    from { transform: translateX(0); }
    to   { transform: translateX(-12%); }
}

/* ==========================================================================
   Card-flip mechanics (shared)
   ========================================================================== */

.flip-card {
    perspective: 1200px;
    background: transparent;
    cursor: pointer;
    position: relative;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    transform-style: preserve-3d;
}

.flip-card:hover .flip-card-inner,
.flip-card.is-flipped .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
    position: absolute;
    inset: 0;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    border-radius: 6px;
    overflow: hidden;
}

.flip-card-back {
    transform: rotateY(180deg);
    background: var(--c-leaf-vein);
    color: var(--c-dawn-sky);
    padding: 1.75rem 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    box-shadow: inset 0 0 0 1px rgba(168, 213, 186, 0.25);
}

/* Card front watercolor washes */
.wash {
    position: relative;
    box-shadow:
        0 12px 40px rgba(26, 26, 46, 0.12),
        inset 0 0 0 1px rgba(255, 255, 255, 0.25);
}

.wash::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='120' height='120'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='1.2' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)' opacity='0.4'/></svg>");
    opacity: 0.07;
    mix-blend-mode: multiply;
    pointer-events: none;
}

.wash--a {
    background:
        radial-gradient(circle at 30% 30%, rgba(168, 213, 186, 0.85) 0%, transparent 55%),
        radial-gradient(circle at 70% 60%, rgba(107, 143, 113, 0.7) 0%, transparent 60%),
        radial-gradient(circle at 50% 80%, rgba(194, 166, 140, 0.6) 0%, transparent 65%),
        linear-gradient(135deg, #F2E8DF 0%, #D4C5B2 100%);
}

.wash--b {
    background:
        radial-gradient(circle at 70% 25%, rgba(61, 107, 126, 0.55) 0%, transparent 55%),
        radial-gradient(circle at 25% 70%, rgba(212, 197, 178, 0.85) 0%, transparent 60%),
        radial-gradient(circle at 55% 50%, rgba(168, 213, 186, 0.5) 0%, transparent 55%),
        linear-gradient(150deg, #F2E8DF 0%, #C2A68C 100%);
}

.wash--c {
    background:
        radial-gradient(circle at 20% 20%, rgba(194, 166, 140, 0.85) 0%, transparent 55%),
        radial-gradient(circle at 80% 70%, rgba(107, 143, 113, 0.65) 0%, transparent 60%),
        radial-gradient(circle at 45% 45%, rgba(212, 197, 178, 0.6) 0%, transparent 60%),
        linear-gradient(120deg, #D4C5B2 0%, #6B8F71 100%);
}

.card-tag {
    position: absolute;
    bottom: 1rem;
    left: 1rem;
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.65rem;
    letter-spacing: 0.12em;
    color: var(--c-twilight-ink);
    opacity: 0.6;
}

.card-back-title {
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--c-glow-lichen);
    margin-bottom: 1rem;
}

.card-back-body {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 0.82rem;
    line-height: 1.7;
    color: var(--c-dawn-sky);
    margin-bottom: 1.25rem;
}

.card-back-meta {
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    color: var(--c-glow-lichen);
    opacity: 0.85;
    margin-top: auto;
}

/* ==========================================================================
   Section 2: Meadow
   ========================================================================== */

.biome--meadow {
    background:
        radial-gradient(ellipse at 80% 20%, rgba(168, 213, 186, 0.25) 0%, transparent 55%),
        radial-gradient(ellipse at 20% 80%, rgba(107, 143, 113, 0.3) 0%, transparent 55%),
        linear-gradient(180deg, #D4C5B2 0%, #C8B69E 60%, #C2A68C 100%);
    gap: 2rem;
}

.meadow-header {
    text-align: center;
    color: var(--c-twilight-ink);
}

.meadow-cards {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2.5rem;
    width: 100%;
    max-width: 1100px;
}

.flip-card--a,
.flip-card--b,
.flip-card--c {
    width: 280px;
    height: 360px;
    flex-shrink: 0;
}

.flip-card--a { transform: translateY(0); }
.flip-card--b { transform: translateY(-2rem); }
.flip-card--c { transform: translateY(1rem); }

/* ==========================================================================
   Section 3: Brook
   ========================================================================== */

.biome--brook {
    background:
        radial-gradient(ellipse at 50% 50%, rgba(168, 213, 186, 0.18) 0%, transparent 60%),
        linear-gradient(180deg, #C2A68C 0%, #97987B 50%, #6B8F71 100%);
    gap: 2.5rem;
    color: var(--c-dawn-sky);
}

.brook-text {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 900px;
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: clamp(0.875rem, 1.2vw, 1.05rem);
    line-height: 1.85;
    color: var(--c-dawn-sky);
}

.brook-text--top { margin-bottom: auto; }
.brook-text--bottom { margin-top: auto; }

.drift-line {
    margin-bottom: 0.5rem;
    opacity: 0.92;
}

.brook-text--top .drift-line:nth-child(1) { margin-left: 0; }
.brook-text--top .drift-line:nth-child(2) { margin-left: 1.5rem; }
.brook-text--top .drift-line:nth-child(3) { margin-left: 3rem; }

.brook-text--bottom .drift-line:nth-child(1) { margin-left: 4rem; }
.brook-text--bottom .drift-line:nth-child(2) { margin-left: 2rem; }
.brook-text--bottom .drift-line:nth-child(3) { margin-left: 0; }

.brook-waves {
    position: relative;
    width: 120vw;
    height: 220px;
    margin-left: -10vw;
    overflow: hidden;
    z-index: 1;
}

.brook-wave {
    position: absolute;
    left: 0;
    top: 0;
    width: 200%;
    height: 100%;
    fill: none;
    will-change: transform;
}

.brook-wave path {
    fill: none;
    stroke-linecap: round;
}

.brook-wave--1 path { stroke: var(--c-leaf-vein);    stroke-width: 1.5; opacity: 0.6; }
.brook-wave--2 path { stroke: var(--c-meadow-blush); stroke-width: 1.5; opacity: 0.5; }
.brook-wave--3 path { stroke: var(--c-glow-lichen);  stroke-width: 1.5; opacity: 0.45; }
.brook-wave--4 path { stroke: var(--c-dawn-sky);     stroke-width: 1.5; opacity: 0.35; }
.brook-wave--5 path { stroke: var(--c-brook-depth);  stroke-width: 1.5; opacity: 0.55; }

.brook-wave--1 { top: 30px;  animation: wave-drift  8s linear infinite; }
.brook-wave--2 { top: 65px;  animation: wave-drift 12s linear infinite; }
.brook-wave--3 { top: 100px; animation: wave-drift 16s linear infinite; }
.brook-wave--4 { top: 135px; animation: wave-drift 20s linear infinite; }
.brook-wave--5 { top: 170px; animation: wave-drift 24s linear infinite; }

@keyframes wave-drift {
    from { transform: translateX(0); }
    to   { transform: translateX(-50%); }
}

/* ==========================================================================
   Section 4: Glade
   ========================================================================== */

.biome--glade {
    background:
        radial-gradient(ellipse at 50% 30%, rgba(168, 213, 186, 0.2) 0%, transparent 60%),
        linear-gradient(180deg, #6B8F71 0%, #547D77 55%, #3D6B7E 100%);
    gap: 2rem;
    color: var(--c-dawn-sky);
}

.glade-overlay {
    position: absolute;
    inset: 0;
    background: hsla(var(--glade-hue, 120), 30%, 50%, 0.08);
    transition: background 1.4s ease-out;
    pointer-events: none;
    z-index: 0;
}

.biome--glade.is-flipping {
    --glade-hue: 140;
}

.glade-header {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--c-dawn-sky);
}

.flip-card--glade {
    width: clamp(280px, 80vw, 400px);
    height: clamp(360px, 60vh, 500px);
    position: relative;
    z-index: 2;
}

.wash--glade {
    background:
        radial-gradient(circle at 50% 30%, rgba(168, 213, 186, 0.85) 0%, transparent 55%),
        radial-gradient(circle at 25% 65%, rgba(212, 197, 178, 0.7) 0%, transparent 55%),
        radial-gradient(circle at 75% 70%, rgba(107, 143, 113, 0.7) 0%, transparent 55%),
        radial-gradient(circle at 50% 90%, rgba(194, 166, 140, 0.55) 0%, transparent 55%),
        radial-gradient(circle at 30% 20%, rgba(61, 107, 126, 0.4) 0%, transparent 50%),
        linear-gradient(135deg, #F2E8DF 0%, #6B8F71 100%);
    box-shadow: 0 20px 60px rgba(26, 26, 46, 0.25);
}

.flip-card--glade .flip-card-back {
    padding: 2.5rem 2rem;
}

.glade-tag {
    bottom: 1.25rem;
    left: 1.25rem;
}

.glade-title {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(1.2rem, 2.4vw, 1.6rem);
    letter-spacing: 0.04em;
    color: var(--c-glow-lichen);
    text-transform: none;
    line-height: 1.3;
    margin-bottom: 1.25rem;
}

.glade-body {
    font-size: 0.85rem;
    line-height: 1.85;
}

.glade-meta {
    margin-top: 1.5rem;
}

.flip-card--glade .flip-card-inner {
    transition: transform 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ==========================================================================
   Section 5: Twilight
   ========================================================================== */

.biome--twilight {
    background:
        radial-gradient(ellipse at 50% 20%, rgba(168, 213, 186, 0.1) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 80%, rgba(61, 107, 126, 0.4) 0%, transparent 60%),
        linear-gradient(180deg, #3D6B7E 0%, #355168 50%, #2C3E50 100%);
    color: var(--c-dawn-sky);
}

.ambient-pulse {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.pulse-wave {
    position: absolute;
    left: -10%;
    width: 120%;
    height: 240px;
    fill: none;
    stroke: var(--c-glow-lichen);
    stroke-width: 3;
    stroke-dasharray: 20 40;
    opacity: 0.06;
    animation: pulse 6s ease-in-out infinite;
}

.pulse-wave path {
    fill: none;
    stroke: inherit;
    stroke-width: inherit;
}

.pulse-wave.one   { top: 18%; animation-delay: 0s; }
.pulse-wave.two   { top: 48%; animation-delay: 2s; stroke: var(--c-meadow-blush); }
.pulse-wave.three { top: 72%; animation-delay: 4s; stroke: var(--c-dawn-sky); }

@keyframes pulse {
    0%, 100% { opacity: 0.06; transform: translateX(0); }
    50%      { opacity: 0.12; transform: translateX(-30px); }
}

.twilight-content {
    position: relative;
    z-index: 2;
    max-width: 720px;
    text-align: left;
    color: var(--c-dawn-sky);
}

.twilight-label {
    color: var(--c-glow-lichen);
}

.twilight-heading {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(2rem, 4.5vw, 3.4rem);
    letter-spacing: 0.04em;
    line-height: 1.2;
    color: var(--c-dawn-sky);
    margin-bottom: 2.5rem;
}

.twilight-line {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: clamp(0.875rem, 1.2vw, 1.05rem);
    line-height: 1.85;
    color: var(--c-dawn-sky);
    margin-bottom: 0.75rem;
    opacity: 0.92;
}

.twilight-couplet {
    margin-top: 2.5rem;
    font-family: var(--font-display);
    font-weight: 300;
    font-style: italic;
    font-size: clamp(1.05rem, 1.8vw, 1.4rem);
    line-height: 1.6;
    letter-spacing: 0.03em;
    color: var(--c-glow-lichen);
}

[data-reveal] {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

[data-reveal].is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   Section 6: Night Garden
   ========================================================================== */

.biome--night {
    background:
        radial-gradient(ellipse at 30% 30%, rgba(168, 213, 186, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 80%, rgba(61, 107, 126, 0.3) 0%, transparent 50%),
        linear-gradient(180deg, #2C3E50 0%, #232238 50%, #1A1A2E 100%);
    color: var(--c-dawn-sky);
    justify-content: flex-start;
    padding-top: clamp(3rem, 8vh, 5rem);
}

.constellation {
    position: relative;
    width: 100%;
    max-width: 1100px;
    height: 60vh;
    min-height: 420px;
    flex: 0 0 auto;
}

.mini-card {
    position: absolute;
    width: 80px;
    height: 80px;
    perspective: 800px;
    cursor: pointer;
}

.mini-card .flip-card-inner {
    transition: transform 1.0s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.mini-card:hover .flip-card-inner,
.mini-card.is-flipped .flip-card-inner {
    transform: rotateY(180deg);
}

.mini-front,
.mini-back {
    position: absolute;
    inset: 0;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    border-radius: 4px;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.35);
}

.mini-back {
    transform: rotateY(180deg);
    background: var(--c-leaf-vein);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--c-dawn-sky);
    box-shadow:
        0 4px 18px rgba(0, 0, 0, 0.45),
        inset 0 0 0 1px var(--c-glow-lichen);
}

.mini-back span {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 1rem;
    letter-spacing: 0.04em;
    color: var(--c-glow-lichen);
}

.mini-front--1 { background: var(--c-dawn-sky); }
.mini-front--2 { background: var(--c-morning-wash); }
.mini-front--3 { background: var(--c-meadow-blush); }
.mini-front--4 { background: var(--c-leaf-vein); }
.mini-front--5 { background: var(--c-brook-depth); }
.mini-front--6 { background: var(--c-twilight-ink); box-shadow: inset 0 0 0 1px rgba(168,213,186,0.25), 0 4px 18px rgba(0,0,0,0.4); }
.mini-front--7 { background: var(--c-glow-lichen); }
.mini-front--8 { background: var(--c-night-loam); box-shadow: inset 0 0 0 1px rgba(168,213,186,0.3), 0 4px 18px rgba(0,0,0,0.5); }

.mini-front {
    position: relative;
    overflow: hidden;
}

.mini-front::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.18) 0%, transparent 55%);
    pointer-events: none;
}

.night-couplet {
    position: relative;
    z-index: 2;
    text-align: center;
    margin-top: auto;
    margin-bottom: 4vh;
    font-family: var(--font-mono);
    font-weight: 300;
    color: var(--c-dawn-sky);
}

.night-couplet p {
    font-size: clamp(0.875rem, 1.2vw, 1.05rem);
    line-height: 1.85;
    letter-spacing: 0.03em;
    opacity: 0.92;
}

.night-couplet p:first-child {
    color: var(--c-glow-lichen);
}

.night-meta {
    margin-top: 1.5rem;
    font-weight: 500;
    font-size: 0.7rem !important;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    opacity: 0.55 !important;
    color: var(--c-meadow-blush);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 720px) {
    .meadow-cards {
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
    }

    .flip-card--a,
    .flip-card--b,
    .flip-card--c {
        transform: none;
        width: min(320px, 88vw);
    }

    .brook-text--top .drift-line,
    .brook-text--bottom .drift-line {
        margin-left: 0 !important;
    }

    .constellation {
        min-height: 520px;
    }

    .mini-card {
        width: 64px;
        height: 64px;
    }
}