/* mosun.xyz — 모순 / contradiction
   Zen-contemplative palette and typography.
   Palette:
     #f5f2eb  Light Ground
     #1a1a22  Dark Text
     #8a8a8a  Middle Gray
     #c8c4bc  Subtle Line
     #4a4a5a  Twilight
     #2a5f4a  Balance Green
     #e8e4dc  Paper Warm
*/

:root {
    --ground: #f5f2eb;
    --paper: #e8e4dc;
    --ink: #1a1a22;
    --twilight: #4a4a5a;
    --middle: #8a8a8a;
    --subtle: #c8c4bc;
    --balance: #2a5f4a;

    --font-display: "Cormorant", "Space", serif;
    --font-body: "Noto Sans KR", "Space", system-ui, sans-serif;
    --font-label: "Josefin Sans", "Space", sans-serif;

    --col: 500px;
}

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

html, body {
    background: var(--ground);
    color: var(--ink);
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 16px;
    line-height: 1.9;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    min-height: 100vh;
    overflow-x: hidden;
}

.page {
    max-width: var(--col);
    margin: 0 auto;
    padding: clamp(4rem, 12vh, 9rem) clamp(1.25rem, 4vw, 2rem);
    text-align: center;
    position: relative;
}

/* Soft vertical gradient guideline — barely visible */
.page::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background:
        radial-gradient(ellipse at center, transparent 30%, var(--paper) 100%);
    opacity: 0.5;
    z-index: -1;
}

/* ---------------- Hero ---------------- */

.hero {
    padding: clamp(2rem, 6vh, 5rem) 0 clamp(4rem, 10vh, 8rem);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.yin-yang {
    width: 50px;
    height: 50px;
    position: relative;
    border-radius: 50%;
    border: 1px solid var(--subtle);
    overflow: hidden;
    background: var(--ground);
    transition: transform 18s linear;
    animation: slow-rotate 60s linear infinite;
}

.yin-yang.small {
    width: 28px;
    height: 28px;
    animation-duration: 90s;
}

.yin-yang .half {
    position: absolute;
    top: 0;
    width: 50%;
    height: 100%;
}

.yin-yang .half-dark {
    left: 0;
    background: var(--ink);
}

.yin-yang .half-light {
    right: 0;
    background: var(--ground);
}

@keyframes slow-rotate {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(2rem, 5vw, 3.5rem);
    letter-spacing: 0.02em;
    color: var(--ink);
    line-height: 1.2;
    margin-top: 0.5rem;
}

.hero-subtitle {
    font-family: var(--font-body);
    font-weight: 300;
    color: var(--twilight);
    font-size: 0.95rem;
    letter-spacing: 0.05em;
}

.hero-meta {
    font-family: var(--font-label);
    font-weight: 300;
    color: var(--middle);
    font-size: 0.78rem;
    letter-spacing: 0.18em;
    text-transform: lowercase;
    margin-top: 0.25rem;
}

/* ---------------- Contradiction ---------------- */

.contradiction {
    padding: clamp(3rem, 6vh, 5rem) 0;
    margin: clamp(4rem, 10vh, 8rem) 0;
    text-align: center;
    opacity: 0.78;
    transition: opacity 1.6s ease;
    position: relative;
}

/* Breathing rhythm — sections closer to the page center are slightly more present */
.contradiction[data-index="1"] { opacity: 0.78; }
.contradiction[data-index="2"] { opacity: 0.86; }
.contradiction[data-index="3"] { opacity: 0.93; }
.contradiction[data-index="4"] { opacity: 1.00; }
.contradiction[data-index="5"] { opacity: 0.93; }
.contradiction[data-index="6"] { opacity: 0.86; }
.contradiction[data-index="7"] { opacity: 0.78; }

/* Alternating warm-paper backgrounds, very subtle */
.contradiction:nth-of-type(even) {
    background: linear-gradient(180deg, transparent 0%, var(--paper) 18%, var(--paper) 82%, transparent 100%);
}

.contradiction.center {
    padding: clamp(4rem, 8vh, 7rem) 0;
}

.contradiction .prelude {
    font-family: var(--font-label);
    font-weight: 300;
    font-size: 0.75rem;
    letter-spacing: 0.3em;
    color: var(--middle);
    text-transform: uppercase;
    margin-bottom: 1.5rem;
}

.contradiction .question {
    font-family: var(--font-display);
    font-weight: 300;
    font-style: italic;
    font-size: clamp(1.4rem, 3.5vw, 2.1rem);
    line-height: 1.35;
    color: var(--ink);
    margin-bottom: clamp(2.5rem, 6vh, 4rem);
    letter-spacing: 0.005em;
}

/* Pair — thesis / antithesis */

.pair {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(1.5rem, 4vh, 2.75rem);
    padding: 0 0.5rem;
}

.block {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.85rem;
}

.label {
    font-family: var(--font-label);
    font-weight: 300;
    font-size: 0.8rem;
    letter-spacing: 0.08em;
    color: var(--middle);
    text-transform: lowercase;
    display: inline-block;
    margin-bottom: 0.25rem;
}

.block .ko {
    font-family: var(--font-body);
    font-weight: 400;
    color: var(--ink);
    font-size: 1.05rem;
    line-height: 1.85;
    letter-spacing: 0.005em;
}

.block .en {
    font-family: var(--font-display);
    font-weight: 300;
    color: var(--twilight);
    font-size: 1rem;
    line-height: 1.75;
    font-style: italic;
    max-width: 38ch;
}

.block.antithesis .ko {
    color: var(--twilight);
}

.block.antithesis .en {
    color: var(--ink);
    font-style: normal;
    font-family: var(--font-body);
    font-weight: 300;
}

/* Thin centered divider — the single accent */
.divider {
    width: 60px;
    height: 1px;
    background: var(--balance);
    margin: 0 auto;
    transform-origin: center;
    transition: width 1.2s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.contradiction.is-visible .divider {
    width: 90px;
}

/* ---------------- Closing ---------------- */

.closing {
    margin-top: clamp(5rem, 12vh, 9rem);
    padding: clamp(3rem, 8vh, 6rem) 0 clamp(2rem, 5vh, 4rem);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    border-top: 1px solid var(--subtle);
}

.koan {
    font-family: var(--font-display);
    font-weight: 300;
    font-style: italic;
    color: var(--twilight);
    font-size: 1.1rem;
    line-height: 1.7;
    letter-spacing: 0.01em;
}

.koan.en {
    color: var(--middle);
    font-size: 0.95rem;
}

.signature {
    margin-top: 1.5rem;
    font-family: var(--font-label);
    font-weight: 300;
    color: var(--middle);
    font-size: 0.75rem;
    letter-spacing: 0.25em;
    text-transform: uppercase;
}

/* ---------------- Reveal ---------------- */

.fade-in {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 1.6s ease, transform 1.6s ease;
}

.fade-in.is-visible {
    opacity: var(--target-opacity, 1);
    transform: translateY(0);
}

/* Honour breathing-rhythm opacities once visible */
.contradiction[data-index="1"].is-visible { opacity: 0.78; }
.contradiction[data-index="2"].is-visible { opacity: 0.86; }
.contradiction[data-index="3"].is-visible { opacity: 0.93; }
.contradiction[data-index="4"].is-visible { opacity: 1.00; }
.contradiction[data-index="5"].is-visible { opacity: 0.93; }
.contradiction[data-index="6"].is-visible { opacity: 0.86; }
.contradiction[data-index="7"].is-visible { opacity: 0.78; }

/* ---------------- Responsive ---------------- */

@media (max-width: 540px) {
    .page {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }

    .block .en {
        max-width: none;
    }

    .hero-title {
        font-size: 2.2rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .yin-yang {
        animation: none;
    }
    .fade-in {
        opacity: 1;
        transform: none;
        transition: none;
    }
    .divider {
        transition: none;
    }
}