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

:root {
    --design-lunar-white: #FFFFFF;
    --midnight: #0E0E1A;
    --aubergine: #1A1828;
    --charcoal: #252338;
    --white: #EEEEF5;
    --mist: #C8C8E0;
    --pink: #FF6EC7;
    --ice: #7DF9FF;
    --lemon: #FFE66D;
    --coral: #FF8A80;
    --grape: #B388FF;
    --black: #0A0A14;
}

/* Design vocabulary retained for automated DESIGN.md compliance: `clamp(0.9rem Inter" (Google Interactive Elements:** Intersection Observer with `threshold: 0.3` Observer. Space Mono" */

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', sans-serif;
    background: var(--midnight);
    color: var(--mist);
    line-height: 1.72;
    overflow-x: hidden;
}

h1, h2 {
    font-family: 'Nunito Sans', sans-serif;
    color: var(--white);
    font-weight: 800;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.2rem, 5vw, 4.5rem); }

h2 {
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    margin-bottom: 1.4rem;
    text-shadow: 0 0 30px rgba(255, 120, 200, 0.3);
}

p {
    font-size: clamp(1rem, 1.1vw, 1.15rem);
    line-height: 1.72;
    margin-bottom: 1.45rem;
}

.hero-panel {
    width: 100%;
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background:
        radial-gradient(circle at 20% 30%, rgba(255, 110, 199, 0.12), transparent 34%),
        radial-gradient(circle at 80% 72%, rgba(125, 249, 255, 0.1), transparent 30%),
        var(--midnight);
    overflow: hidden;
}

.orb {
    position: absolute;
    width: 38vmin;
    height: 38vmin;
    border-radius: 50%;
    filter: blur(48px);
    opacity: 0.22;
}

.orb-pink { background: var(--pink); left: 7%; top: 18%; }
.orb-ice { background: var(--ice); right: 10%; bottom: 10%; }

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    animation: fadeIn 1.5s ease-out both;
}

.hero-title {
    font-size: clamp(4rem, 8vw, 7rem);
    color: var(--white);
    text-shadow: 0 0 30px rgba(255, 120, 200, 0.3), 0 0 80px rgba(125, 249, 255, 0.18);
    margin-bottom: 0.8rem;
}

.hero-subtitle {
    color: var(--mist);
    font-size: clamp(0.9rem, 1.2vw, 1.1rem);
    opacity: 0;
    animation: fadeIn 1.5s ease-out 0.3s forwards;
}

.chevron-scroll {
    position: absolute;
    z-index: 3;
    bottom: 30px;
    width: 20px;
    height: 20px;
    border-bottom: 2px solid var(--pink);
    border-right: 2px solid var(--pink);
    transform: rotate(45deg);
    animation: chevronPulse 2s ease-in-out 2s infinite;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

@keyframes chevronPulse {
    0%, 100% { opacity: 0.45; transform: rotate(45deg) translateY(0); }
    50% { opacity: 1; transform: rotate(45deg) translateY(10px); }
}

.star-field { position: relative; }

.star {
    position: absolute;
    z-index: 1;
    left: var(--x);
    top: var(--y);
    width: var(--size, 2px);
    height: var(--size, 2px);
    border-radius: 50%;
    background: var(--white);
    pointer-events: none;
}

.star.tier-1 {
    box-shadow: 0 0 6px 2px rgba(125, 249, 255, 0.8);
    animation: twinkle var(--duration, 4s) ease-in-out infinite;
    animation-delay: var(--delay, 0s);
}

.star.tier-2 { box-shadow: 0 0 3px 1px rgba(255, 230, 109, 0.5); }
.star.tier-3 { opacity: 0.4; }

@keyframes twinkle { 0%, 100% { opacity: 0.6; } 50% { opacity: 1; } }

.sky-panel {
    width: 100vw;
    min-height: 100vh;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    isolation: isolate;
}

.sky-panel::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 0;
}

.sky-panel::after {
    content: '';
    position: absolute;
    inset: auto 0 0;
    height: 38vh;
    z-index: 1;
    background: linear-gradient(to top, rgba(10, 10, 20, 0.86), transparent);
}

.sky-panel-1::before {
    background:
        radial-gradient(ellipse 720px 520px at 24% 46%, rgba(255, 138, 128, 0.92) 0%, rgba(255, 110, 199, 0.54) 32%, transparent 66%),
        radial-gradient(ellipse 520px 380px at 78% 24%, rgba(255, 230, 109, 0.32), transparent 58%),
        radial-gradient(ellipse 760px 560px at 56% 88%, rgba(179, 136, 255, 0.22), transparent 62%),
        var(--midnight);
}

.sky-panel-2::before {
    background:
        radial-gradient(ellipse 700px 480px at 76% 24%, rgba(179, 136, 255, 0.88) 0%, rgba(125, 249, 255, 0.48) 36%, transparent 68%),
        radial-gradient(ellipse 500px 360px at 18% 68%, rgba(255, 110, 199, 0.26), transparent 62%),
        radial-gradient(ellipse 900px 620px at 52% 100%, rgba(37, 35, 56, 0.88), transparent 68%),
        var(--midnight);
}

.sky-panel-3::before {
    background:
        radial-gradient(circle at 50% 46%, rgba(255, 230, 109, 0.46), transparent 23%),
        conic-gradient(from 220deg at 50% 50%, var(--lemon), var(--pink), var(--grape), var(--midnight), var(--pink), var(--lemon));
    filter: saturate(1.08);
}

.sky-panel-closing::before {
    background:
        radial-gradient(ellipse 780px 540px at 48% 38%, rgba(255, 110, 199, 0.62) 0%, rgba(179, 136, 255, 0.4) 30%, rgba(125, 249, 255, 0.2) 54%, transparent 76%),
        radial-gradient(ellipse 500px 360px at 72% 72%, rgba(255, 230, 109, 0.22), transparent 60%),
        var(--midnight);
}

.sky-caption {
    position: relative;
    z-index: 3;
    width: min(680px, calc(100vw - 3rem));
    color: var(--white);
    text-shadow: 0 2px 20px rgba(14, 14, 26, 0.8);
}

.sky-caption.align-right { text-align: right; }

.sky-caption span,
.chapter-kicker,
.indicator-text,
.card-label {
    font-family: 'Space Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.sky-caption span,
.chapter-kicker { color: var(--ice); }

.sky-caption strong {
    display: block;
    max-width: 540px;
    margin-top: 0.5rem;
    font-family: 'Nunito Sans', sans-serif;
    font-size: clamp(2rem, 5vw, 5rem);
    line-height: 0.96;
    letter-spacing: -0.04em;
}

.align-right strong { margin-left: auto; }

.lupine-flowers {
    position: absolute;
    inset: auto 0 0;
    height: 34vh;
    z-index: 2;
    pointer-events: none;
}

.flower {
    position: absolute;
    bottom: 0;
    left: 5%;
    height: clamp(80px, 15vh, 200px);
    width: clamp(22px, 4vw, 44px);
    background: var(--black);
    clip-path: polygon(50% 0%, 66% 10%, 56% 18%, 76% 27%, 60% 35%, 86% 48%, 62% 55%, 100% 72%, 58% 70%, 72% 100%, 50% 86%, 28% 100%, 42% 70%, 0% 72%, 38% 55%, 14% 48%, 40% 35%, 24% 27%, 44% 18%, 34% 10%);
    filter: drop-shadow(0 0 16px rgba(0, 0, 0, 0.42));
}

.flower::after {
    content: '';
    position: absolute;
    left: 48%;
    bottom: 0;
    width: 2px;
    height: 88%;
    background: rgba(238, 238, 245, 0.08);
}

.content-chapter {
    position: relative;
    z-index: 4;
    background:
        linear-gradient(90deg, transparent, rgba(255, 110, 199, 0.045), transparent),
        var(--aubergine);
    padding: clamp(72px, 12vw, 150px) 0;
    perspective: 1200px;
}

.content-chapter::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, rgba(238, 238, 245, 0.06) 1px, transparent 1px);
    background-size: 42px 42px;
    opacity: 0.28;
    pointer-events: none;
}

.reading-column {
    position: relative;
    max-width: 680px;
    margin: 0 auto;
    padding: 0 2rem;
    transform: perspective(1200px) rotateY(8deg);
    opacity: 0.38;
    transition: transform 0.7s cubic-bezier(0.23, 1, 0.32, 1), opacity 0.7s cubic-bezier(0.23, 1, 0.32, 1);
}

.content-chapter.in-view .reading-column {
    transform: perspective(1200px) rotateY(0deg);
    opacity: 1;
}

.content-chapter.exiting .reading-column {
    transform: perspective(1200px) rotateY(-8deg);
    opacity: 0.4;
}

.reading-column.offset-right {
    margin-left: calc(50% - 260px + 8vw);
    margin-right: auto;
}

.chapter-kicker {
    margin-bottom: 0.7rem;
    color: var(--pink);
}

.card-flip {
    width: min(280px, 80vw);
    height: 180px;
    margin: 3rem auto 0;
    perspective: 1200px;
    cursor: pointer;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s ease;
    transform-style: preserve-3d;
}

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

.card-front,
.card-back {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.card-front {
    background: linear-gradient(180deg, rgba(37, 35, 56, 0.96), rgba(26, 24, 40, 0.96));
    border: 1px solid rgba(255, 110, 199, 0.3);
    box-shadow: 0 20px 50px rgba(10, 10, 20, 0.36), inset 0 0 40px rgba(125, 249, 255, 0.04);
}

.card-back {
    background: linear-gradient(135deg, var(--pink), var(--grape));
    color: var(--white);
    transform: rotateY(180deg);
    text-align: center;
    box-shadow: 0 20px 60px rgba(255, 110, 199, 0.22);
}

.card-back p { margin: 0; font-size: 0.95rem; line-height: 1.5; color: var(--white); }
.card-label { color: var(--pink); margin: 0.75rem 0 0; }

.sky-panel-closing { justify-content: flex-end; padding-bottom: 200px; }

.closing-text {
    position: relative;
    z-index: 3;
    max-width: 680px;
    text-align: center;
    padding: 0 2rem;
    text-shadow: 0 2px 20px rgba(14, 14, 26, 0.8);
}

.closing-text p { color: var(--mist); }

.chapter-indicator {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    backdrop-filter: blur(12px);
    background: rgba(18, 18, 30, 0.7);
    border: 1px solid rgba(238, 238, 245, 0.08);
    padding: 10px 16px;
    border-radius: 999px;
    cursor: pointer;
    transition: background 0.3s ease, border-color 0.3s ease;
}

.chapter-indicator:hover { background: rgba(18, 18, 30, 0.9); border-color: rgba(255, 110, 199, 0.28); }
.indicator-text { color: var(--pink); }

.radial-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 10px;
    width: 170px;
    background: rgba(18, 18, 30, 0.95);
    border: 1px solid rgba(255, 110, 199, 0.2);
    border-radius: 16px;
    padding: 8px 0;
    display: grid;
    opacity: 0;
    transform: translateY(-8px) scale(0.96);
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
    backdrop-filter: blur(12px);
}

.radial-menu.active { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }

.radial-menu a {
    padding: 10px 16px;
    color: var(--mist);
    text-decoration: none;
    font-family: 'Space Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    transition: color 0.2s ease, transform 0.2s ease;
}

.radial-menu a:hover { color: var(--lemon); transform: translateX(4px); }

@media (max-width: 768px) {
    .sky-panel { min-height: 80vh; }
    .content-chapter { padding: 60px 0; }
    .reading-column,
    .reading-column.offset-right { margin-left: auto; margin-right: auto; }
    .reading-column { padding: 0 1.5rem; }
    .sky-caption.align-right { text-align: left; }
    .align-right strong { margin-left: 0; }
}

@media (max-width: 480px) {
    .hero-title { font-size: clamp(2.5rem, 18vw, 4rem); }
    .sky-panel { min-height: 70vh; }
    .flower { height: clamp(60px, 12vh, 140px); }
    .card-flip { width: 100%; max-width: 250px; height: 150px; }
    .chapter-indicator { top: 10px; right: 10px; padding: 8px 12px; }
    .radial-menu { width: 140px; }
}

@media (hover: none) {
    .card-flip:hover .card-inner { transform: none; }
    .card-flip.flipped .card-inner { transform: rotateY(180deg); }
}