/* ============================================
   zhxiansec — Editorial · 2025
   ============================================ */

@font-face {
    font-family: 'Maple Mono NF CN';
    font-style: italic;
    font-weight: 400;
    font-display: swap;
    src: url('../fonts/MapleMonoNormalNL-NF-CN-LightItalic.woff2') format('woff2');
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
a, button, [role="button"] { -webkit-tap-highlight-color: transparent; }

/* ============================================
   THEME TOKENS
   ============================================ */

/* Light tokens — applied by default, by explicit data-theme="light",
   and by data-theme="auto" when JS detects light preference. */
:root,
:root[data-theme="light"],
:root[data-theme="auto"] {
    --bg:           #ece8e2;
    --bg-elev:     #f5f1ec;
    --ink:          #1c1d22;
    --ink-soft:    #6c6d74;
    --ink-faint:   #a8a8af;
    --rule:         #d4cfc6;
    --rule-soft:   #e2ddd3;
    --card:         #ffffff;
    --card-rule:   rgba(28, 29, 34, .08);
    --hover-bg:    rgba(255, 255, 255, .55);
    --hover-rule:  rgba(28, 29, 34, .10);
    --hover-shadow: 0 6px 24px rgba(20, 15, 8, .06);
    --shadow-card:
        0 1px 2px rgba(20, 15, 8, .05),
        0 12px 24px rgba(20, 15, 8, .08),
        0 28px 56px rgba(20, 15, 8, .10);
    --shadow-card-hi:
        0 2px 4px rgba(20, 15, 8, .07),
        0 18px 32px rgba(20, 15, 8, .12),
        0 40px 80px rgba(20, 15, 8, .15);
    --img-filter:  grayscale(.18) contrast(.96);
    --grain-blend: multiply;
    --grain-opacity: .03;
    --accent:       #7a5c3e;
    --ease:         cubic-bezier(.2, .7, .2, 1);
}

/* Dark tokens — system pref (only when no manual override) + explicit data-theme="dark". */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]):not([data-theme="dark"]):not([data-theme="auto"]) {
        --bg:           #14151a;
        --bg-elev:     #1a1c22;
        --ink:          #e8e6e0;
        --ink-soft:    #9a9aa3;
        --ink-faint:   #5d5e66;
        --rule:         #2d2f37;
        --rule-soft:   #232530;
        --card:         #1e2028;
        --card-rule:   rgba(255, 255, 255, .06);
        --hover-bg:    rgba(255, 255, 255, .04);
        --hover-rule:  rgba(255, 255, 255, .10);
        --hover-shadow: 0 6px 28px rgba(0, 0, 0, .35);
        --shadow-card:
            0 1px 2px rgba(0, 0, 0, .35),
            0 12px 24px rgba(0, 0, 0, .35),
            0 28px 56px rgba(0, 0, 0, .40);
        --shadow-card-hi:
            0 2px 4px rgba(0, 0, 0, .45),
            0 18px 32px rgba(0, 0, 0, .45),
            0 40px 80px rgba(0, 0, 0, .55);
        --img-filter:  grayscale(.10) contrast(1.02) brightness(.92);
        --grain-blend: overlay;
        --grain-opacity: .05;
        --accent:       #c8a574;
    }
}

:root[data-theme="dark"] {
    --bg: #14151a; --bg-elev: #1a1c22;
    --ink: #e8e6e0; --ink-soft: #9a9aa3; --ink-faint: #5d5e66;
    --rule: #2d2f37; --rule-soft: #232530;
    --card: #1e2028;
    --card-rule: rgba(255, 255, 255, .06);
    --hover-bg: rgba(255, 255, 255, .04);
    --hover-rule: rgba(255, 255, 255, .10);
    --hover-shadow: 0 6px 28px rgba(0, 0, 0, .35);
    --shadow-card:
        0 1px 2px rgba(0, 0, 0, .35),
        0 12px 24px rgba(0, 0, 0, .35),
        0 28px 56px rgba(0, 0, 0, .40);
    --shadow-card-hi:
        0 2px 4px rgba(0, 0, 0, .45),
        0 18px 32px rgba(0, 0, 0, .45),
        0 40px 80px rgba(0, 0, 0, .55);
    --img-filter: grayscale(.10) contrast(1.02) brightness(.92);
    --grain-blend: overlay;
    --grain-opacity: .05;
    --accent: #c8a574;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Maple Mono NF CN', 'JetBrains Mono', 'SF Mono', Menlo, Consolas,
        'PingFang SC', 'Microsoft YaHei', monospace;
    background: var(--bg);
    color: var(--ink);
    min-height: 100vh;
    line-height: 1.55;
    overflow-x: hidden;
    transition: background .4s ease, color .4s ease;
}

a { color: inherit; text-decoration: none; }

/* Paper / film grain */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: 100;
    pointer-events: none;
    opacity: var(--grain-opacity);
    mix-blend-mode: var(--grain-blend);
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    background-size: 200px;
}

/* ============================================
   NAV
   ============================================ */

.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px clamp(20px, 5vw, 60px);
    background: var(--bg);
    border-bottom: 1px solid var(--rule);
    transition: background .5s ease;
}

.nav.scrolled {
    background: color-mix(in srgb, var(--bg) 82%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.nav-name {
    font-size: .72rem;
    letter-spacing: .22em;
    text-transform: lowercase;
    color: var(--ink);
    font-style: italic;
    transition: color .25s;
}

.nav-name:hover { color: var(--accent); }

.nav-right {
    display: flex;
    align-items: center;
    gap: 14px;
}

.nav-year {
    font-size: .68rem;
    letter-spacing: .18em;
    color: var(--ink-soft);
    font-variant-numeric: tabular-nums;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    height: 26px;
}

.theme-btn {
    font: inherit;
    font-size: .62rem;
    letter-spacing: .22em;
    line-height: 1;
    background: none;
    border: 1px solid var(--rule);
    color: var(--ink-soft);
    cursor: pointer;
    height: 26px;
    padding: 0 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-variant-numeric: tabular-nums;
    transition: color .25s, background .25s, border-color .25s;
}

.theme-btn:hover {
    color: var(--ink);
    border-color: var(--ink);
    background: var(--hover-bg);
}

/* ============================================
   HERO
   ============================================ */

.hero {
    padding: clamp(56px, 11vh, 130px) clamp(20px, 5vw, 60px) clamp(48px, 10vh, 110px);
    border-bottom: 1px solid var(--rule);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: clamp(32px, 6vw, 80px);
    align-items: end;
    max-width: 1280px;
    margin: 0 auto;
}

.hero-eyebrow {
    font-size: .72rem;
    letter-spacing: .22em;
    text-transform: uppercase;
    color: var(--ink-soft);
    margin-bottom: clamp(20px, 4vh, 36px);
    font-variant-numeric: tabular-nums;
}

.hero-title {
    font-family: inherit;
    font-weight: 500;
    font-size: clamp(1.85rem, 5vw, 4.2rem);
    line-height: 1.18;
    letter-spacing: -.01em;
    color: var(--ink);
    animation: fadeUp 1s var(--ease) both;
}

.hero-sub {
    margin-top: clamp(24px, 4vh, 40px);
    font-size: .78rem;
    letter-spacing: .28em;
    text-transform: uppercase;
    color: var(--ink-soft);
}

.hero-figure {
    position: relative;
    aspect-ratio: 3 / 4;
    max-height: 60vh;
    margin-right: clamp(16px, 4vw, 48px);
    animation: fadeUp 1.1s .15s var(--ease) both;
}

.stack {
    position: relative;
    width: 100%;
    height: 100%;
}

/* Remove tap highlight and focus ring on touch; keep ring for keyboard nav */
.stack:focus { outline: none; }
.stack:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.stack { -webkit-tap-highlight-color: transparent; }

.stack-card {
    position: absolute;
    inset: 0;
    background: var(--card);
    padding: 10px 10px 36px;
    border: 1px solid var(--card-rule);
    box-shadow: var(--shadow-card);
    transform-origin: center 60%;
    transition:
        transform 1.4s var(--ease),
        box-shadow 1.2s var(--ease);
}

.stack-card[data-pos="0"] { transform: rotate(-2.4deg); z-index: 3; }
.stack-card[data-pos="1"] { transform: rotate(1.8deg) translate(12px, 10px); z-index: 2; }
.stack-card[data-pos="2"] { transform: rotate(-5.2deg) translate(-14px, 18px); z-index: 1; }

/* Alternate tilt on top card after each cycle */
.stack-top.tilt-alt[data-pos="0"] { transform: rotate(2.6deg) translate(2px, 0); }

.stack:hover .stack-card[data-pos="0"] {
    transform: rotate(-3.8deg) translate(-18px, -10px);
    box-shadow: var(--shadow-card-hi);
    will-change: transform;
}
.stack:hover .stack-top.tilt-alt[data-pos="0"] {
    transform: rotate(3.8deg) translate(18px, -10px);
    box-shadow: var(--shadow-card-hi);
    will-change: transform;
}

.stack-img {
    position: absolute;
    inset: 10px 10px 36px;
    background-size: cover;
    background-position: center;
    background-color: var(--rule-soft);
    filter: var(--img-filter);
    opacity: 0;
    transition: opacity 1.3s ease;
}

.stack-img.loaded { opacity: 1; }

/* Top card stacks two image layers for crossfade */
.stack-top .stack-img {
    transition: opacity 1.4s ease;
}

.stack-caption {
    position: absolute;
    left: 14px;
    bottom: 10px;
    font-size: .68rem;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--ink-soft);
}

/* ============================================
   INDEX — Magazine spread / asymmetric grid
   ============================================ */

.index {
    padding: clamp(60px, 10vh, 110px) clamp(20px, 5vw, 60px);
    max-width: 1280px;
    margin: 0 auto;
}

.index-head {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: clamp(20px, 3.5vh, 36px);
}

.index-rule { flex: 1; height: 1px; background: var(--rule); }

.index-label {
    font-size: .72rem;
    letter-spacing: .3em;
    text-transform: uppercase;
    color: var(--ink-soft);
    font-variant-numeric: tabular-nums;
}

.spreads {
    display: grid;
    grid-template-columns: 1fr 1px 1fr;
    column-gap: clamp(28px, 5vw, 72px);
    row-gap: clamp(28px, 5vh, 56px);
    position: relative;
}

/* Vertical gutter line between the two pages */
.spreads::before {
    content: '';
    grid-column: 2;
    grid-row: 1 / -1;
    background: var(--rule);
    width: 1px;
    justify-self: center;
}

.spread {
    grid-column: 1;
    display: grid;
    grid-template-columns: auto 1fr;
    grid-template-rows: auto auto auto;
    column-gap: clamp(14px, 2vw, 22px);
    row-gap: 10px;
    padding: clamp(18px, 2.4vh, 28px) 0;
    color: var(--ink);
    position: relative;
    opacity: 0;
    transform: translateY(14px);
    transition: opacity .7s var(--ease), transform .7s var(--ease);
}

.spread.spread-offset {
    grid-column: 3;
}

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

/* Stagger the right-column items downward like spreads on a page */
.spread.spread-offset { margin-top: clamp(12px, 2vh, 24px); }

.spread-num {
    grid-row: 1;
    grid-column: 1;
    font-size: .72rem;
    letter-spacing: .2em;
    color: var(--ink-faint);
    font-variant-numeric: tabular-nums;
    padding-top: 12px;
    transition: color .35s var(--ease);
}

.spread-name {
    grid-row: 1;
    grid-column: 2;
    font-family: inherit;
    font-size: clamp(1.8rem, 3.8vw, 2.8rem);
    font-weight: 500;
    line-height: 1.05;
    letter-spacing: -.015em;
    position: relative;
    padding-bottom: 4px;
}

.spread-name::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -6px;
    height: 1px;
    width: 0;
    background: var(--ink);
    transition: width .6s var(--ease);
}

.spread:hover .spread-name::after { width: 100%; }

.spread-desc {
    grid-row: 2;
    grid-column: 2;
    margin-top: 14px;
    font-size: .82rem;
    line-height: 1.7;
    color: var(--ink-soft);
    max-width: 36ch;
}

.spread-meta {
    grid-row: 3;
    grid-column: 2;
    margin-top: 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.spread-tag {
    font-size: .62rem;
    letter-spacing: .28em;
    text-transform: uppercase;
    color: var(--ink-faint);
    padding: 4px 8px;
    border: 1px solid var(--rule);
    transition: color .3s var(--ease), border-color .3s var(--ease);
}

.spread-arrow {
    font-size: 1rem;
    color: var(--ink-faint);
    transition: transform .45s var(--ease), color .3s var(--ease);
}

.spread:hover .spread-num { color: var(--ink-soft); }
.spread:hover .spread-tag { color: var(--ink); border-color: var(--ink); }
.spread:hover .spread-arrow {
    color: var(--accent);
    transform: translateX(10px);
}

/* ============================================
   FOOTER
   ============================================ */

.foot {
    border-top: 1px solid var(--rule);
    padding: clamp(28px, 5vh, 48px) clamp(20px, 5vw, 60px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    font-size: .72rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--ink-soft);
}

.foot-row { display: flex; align-items: center; gap: 10px; }
.foot a { transition: color .2s; }
.foot a:hover { color: var(--ink); }
.sep { color: var(--ink-faint); }

/* ============================================
   KEYFRAMES
   ============================================ */

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

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 860px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
        align-items: start;
    }
    .hero-figure {
        max-height: 42vh;
        aspect-ratio: 4 / 3;
        margin: 0 auto;
        width: min(100%, 420px);
    }
}

@media (max-width: 640px) {
    .theme-btn { padding: 4px 8px; font-size: .6rem; }

    .hero { padding: 40px 18px 36px; }
    .hero-eyebrow { margin-bottom: 16px; font-size: .62rem; letter-spacing: .18em; }
    .hero-title { font-size: clamp(1.6rem, 7vw, 2.4rem); line-height: 1.2; }
    .hero-title br { display: none; }
    .hero-sub { font-size: .62rem; letter-spacing: .2em; margin-top: 18px; }
    .hero-figure {
        max-height: 36vh;
        aspect-ratio: 4 / 3;
        margin-top: 8px;
    }

    .index { padding: 48px 18px; }
    .index-head { margin-bottom: 26px; gap: 14px; }
    .index-label { font-size: .62rem; letter-spacing: .22em; }

    .spreads {
        grid-template-columns: 1fr;
        row-gap: 28px;
        column-gap: 0;
    }
    .spreads::before { display: none; }
    .spread,
    .spread.spread-offset {
        grid-column: 1;
        margin-top: 0;
        padding: 18px 0;
        border-bottom: 1px solid var(--rule);
    }
    .spread:last-child { border-bottom: 0; }
    .spread-name { font-size: 1.6rem; }
    .spread-desc { font-size: .74rem; margin-top: 10px; max-width: none; }
    .spread-meta { margin-top: 10px; }
    .spread-tag { font-size: .56rem; letter-spacing: .22em; padding: 3px 6px; }

    .foot {
        padding: 22px 18px;
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
        font-size: .6rem;
        letter-spacing: .1em;
    }
}

@media (max-width: 380px) {
    .hero-title { font-size: 1.5rem; }
    .spread-name { font-size: 1.4rem; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: .01ms !important;
        transition-duration: .01ms !important;
    }
    .spread { opacity: 1; transform: none; }
}