/* ========================================
   mujun.study — Styles
   Japanese-minimal · Broken-grid · Translucent-frost
   ======================================== */

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

:root {
    --washi-white: #f5f2ed;
    --frost-glass: rgba(230, 226, 220, 0.55);
    --sumi-charcoal: #2e2a25;
    --stone-gray: #8a8279;
    --persimmon: #c45d3e;
    --celadon: #94a89b;
    --bamboo-line: #b8b0a4;
    --body-text: #4a4540;
}

html {
    scroll-behavior: smooth;
}

body.mujun-shosai {
    background-color: var(--washi-white);
    color: var(--sumi-charcoal);
    font-family: 'Nunito Sans', sans-serif;
    font-weight: 400;
    font-size: 1rem;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}

.cjk {
    font-family: 'Zen Kaku Gothic New', sans-serif;
    letter-spacing: 0.1em;
}

/* --- Engawa Header --- */
.engawa {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 clamp(1.5rem, 4vw, 3rem);
    background: rgba(245, 242, 237, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--bamboo-line);
    z-index: 100;
}

.site-title {
    font-family: 'Nunito', sans-serif;
    font-weight: 300;
    font-size: 1.1rem;
    letter-spacing: 0.08em;
    color: var(--sumi-charcoal);
}

.engawa-nav {
    display: flex;
    gap: 2rem;
}

.engawa-nav a {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 300;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    color: var(--stone-gray);
    text-decoration: none;
    text-transform: lowercase;
    background-image: linear-gradient(var(--persimmon), var(--persimmon));
    background-size: 0% 1px;
    background-position: 0 100%;
    background-repeat: no-repeat;
    transition: background-size 0.4s ease;
    padding-bottom: 2px;
}

.engawa-nav a:hover {
    background-size: 100% 1px;
    color: var(--sumi-charcoal);
}

/* --- Study Field (Broken Grid) --- */
.study-field {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 0;
    padding-top: 80px;
    padding-left: clamp(1rem, 3vw, 2.5rem);
    padding-right: clamp(1rem, 3vw, 2.5rem);
    padding-bottom: 4rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* --- Paradox Cards --- */
.paradox-card {
    position: relative;
    padding: clamp(1.5rem, 3vw, 2.5rem);
    background: var(--frost-glass);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    opacity: 0;
    transform: translateX(var(--drift, 0px));
    transition: opacity 1.2s cubic-bezier(0.25, 0.1, 0.25, 1.0),
                transform 1.2s cubic-bezier(0.25, 0.1, 0.25, 1.0);
}

.paradox-card.in-view {
    opacity: 1;
    transform: translateX(0);
}

/* Shoji Frames: alternate border placement */
.paradox-card:nth-child(odd) {
    border-top: 1px solid var(--bamboo-line);
}

.paradox-card:nth-child(even) {
    border-left: 1px solid var(--bamboo-line);
}

.contradiction-mark {
    display: block;
    margin-bottom: 0.75rem;
}

.paradox-title {
    font-family: 'Nunito', sans-serif;
    font-weight: 300;
    font-size: clamp(1.4rem, 2.8vw, 2.4rem);
    letter-spacing: 0.06em;
    color: var(--sumi-charcoal);
    line-height: 1.3;
    margin-bottom: 1rem;
}

.line-illustration {
    margin: 1.5rem 0;
    max-width: 280px;
}

.line-illustration svg {
    width: 100%;
    height: auto;
}

/* Stroke animation */
.stroke-anim path {
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    transition: stroke-dashoffset 2.4s cubic-bezier(0.25, 0.1, 0.25, 1.0);
}

.in-view .stroke-anim path {
    stroke-dashoffset: 0;
}

.paradox-text {
    font-family: 'Nunito Sans', sans-serif;
    font-weight: 400;
    font-size: 1rem;
    line-height: 1.75;
    color: var(--body-text);
    max-width: 52ch;
}

.paradox-index {
    display: block;
    margin-top: 1.5rem;
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 300;
    font-size: 0.75rem;
    color: var(--stone-gray);
    letter-spacing: 0.08em;
}

/* --- Ma Gaps --- */
.ma-gap {
    grid-column: 1 / -1;
    min-height: clamp(120px, 15vh, 240px);
    position: relative;
}

.ma-gap::after {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0.04;
    transition: opacity 0.8s ease;
}

.ma-gap:hover::after {
    opacity: 0.12;
}

/* Asanoha pattern (hexagonal stars approximation) */
.ma-gap[data-pattern="asanoha"]::after {
    background-image:
        repeating-linear-gradient(0deg, var(--celadon) 0px, transparent 1px, transparent 20px),
        repeating-linear-gradient(60deg, var(--celadon) 0px, transparent 1px, transparent 20px),
        repeating-linear-gradient(120deg, var(--celadon) 0px, transparent 1px, transparent 20px);
}

/* Seigaiha pattern (concentric arcs approximation) */
.ma-gap[data-pattern="seigaiha"]::after {
    background-image:
        repeating-radial-gradient(circle at 0% 50%, transparent 0px, transparent 8px, var(--celadon) 8px, var(--celadon) 9px, transparent 9px, transparent 20px),
        repeating-radial-gradient(circle at 50% 50%, transparent 0px, transparent 8px, var(--celadon) 8px, var(--celadon) 9px, transparent 9px, transparent 20px);
}

/* Yagasuri pattern (chevrons) */
.ma-gap[data-pattern="yagasuri"]::after {
    background-image:
        repeating-linear-gradient(45deg, var(--celadon) 0px, transparent 1px, transparent 10px),
        repeating-linear-gradient(-45deg, var(--celadon) 0px, transparent 1px, transparent 10px);
    background-size: 20px 20px;
}

/* --- Sit Section --- */
.sit-section {
    padding: clamp(2rem, 5vw, 4rem) clamp(1.5rem, 3vw, 2.5rem);
    text-align: left;
}

.sit-title {
    font-family: 'Nunito', sans-serif;
    font-weight: 300;
    font-size: clamp(1.4rem, 2.8vw, 2.4rem);
    letter-spacing: 0.06em;
    color: var(--sumi-charcoal);
    margin-bottom: 1rem;
}

.sit-text {
    font-family: 'Nunito Sans', sans-serif;
    font-weight: 400;
    font-size: 1rem;
    line-height: 1.75;
    color: var(--body-text);
    max-width: 52ch;
}

.sit-illustration {
    margin-top: 2rem;
    max-width: 280px;
}

/* --- Footer --- */
.engawa-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem clamp(1.5rem, 4vw, 3rem);
    border-top: 1px solid var(--bamboo-line);
}

.footer-mark {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 300;
    font-size: 0.75rem;
    color: var(--stone-gray);
    letter-spacing: 0.05em;
}

.footer-note {
    font-family: 'Nunito Sans', sans-serif;
    font-weight: 400;
    font-size: 0.8rem;
    color: var(--stone-gray);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .study-field {
        grid-template-columns: 1fr;
    }

    .paradox-card {
        grid-column: 1 / -1 !important;
    }

    .sit-section {
        grid-column: 1 / -1 !important;
    }

    .engawa-nav {
        gap: 1rem;
    }
}