/* ============================================================
   CRYSTAL KNOWLEDGE — "The Crystal Library"
   A page layer over lc.css. Four chapters on alternating surfaces:
     I   Crystal Meanings (paper)   — stones by intention
     II  Birthstones (velvet)       — a jeweller's tray, one stone per month
     III Horoscope (paper)          — a ledger of the twelve signs
     IV  Chinese Zodiac (velvet)    — the 2026 Fire Horse certificate + forecasts
   Colours come only from the surface tokens in lc.css.
   ============================================================ */

/* anchors land below the header and the sticky chapter bar */
html { scroll-padding-top: calc(var(--header) + 76px); }

.k-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.k-glyph { width: 1em; height: 1em; fill: none; stroke: currentColor; stroke-width: 1; stroke-linejoin: round; stroke-linecap: round; flex: none; }
.k-amp { font-family: var(--serif); font-style: italic; font-weight: 300; color: var(--accent-text); }
.k-dot { color: var(--accent); margin: 0 0.1em; }

/* ---------- hero ---------- */
.k-hero { min-height: min(88vh, 860px); display: flex; align-items: center; }
.k-hero .wrap { position: relative; }
.k-hero .display { max-width: 9ch; }
.k-hero__lede { margin-top: 1.8rem; }
.k-hero__ornament { opacity: 0.3; width: min(58vw, 700px); right: -8vw; }
.k-hero__ornament .k-spin { transform-box: view-box; transform-origin: 50% 50%; animation: k-turn 180s linear infinite; }
@keyframes k-turn { to { transform: rotate(360deg); } }

/* ---------- sticky chapter bar ---------- */
.k-subnav { transition: background-color 0.5s var(--ease), border-color 0.5s var(--ease); }
.k-subnav a small { color: var(--accent-text); font-size: 0.62rem; margin-right: 0.7rem; }
@media (min-width: 761px) { .k-subnav .subnav__inner { justify-content: center; gap: 0.3rem 3rem; } }

/* ---------- chapters ---------- */
.k-chapter { overflow-x: clip; }   /* clip, not hidden: hidden would break the sticky intention headers */
.k-chapter > .wrap { position: relative; }
.k-numeral {
    position: absolute;
    top: clamp(1.5rem, 4vw, 3.5rem);
    right: var(--gutter);
    font-family: var(--serif);
    font-style: italic;
    font-weight: 300;
    font-size: clamp(7rem, 17vw, 15rem);
    line-height: 1;
    color: transparent;
    -webkit-text-stroke: 1px var(--line-2);
    pointer-events: none;
    user-select: none;
}
.k-chapter__head { position: relative; }

/* ============================================================
   I. CRYSTAL MEANINGS
   ============================================================ */
.k-index { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.k-index .chip { background: var(--card); }
.k-index .chip .k-glyph { width: 15px; height: 15px; color: var(--accent); }
.k-index .chip.is-active { border-color: var(--accent); color: var(--fg); }

.k-intent {
    display: grid;
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: clamp(2rem, 5vw, 6rem);
    padding: clamp(3rem, 6vw, 5rem) 0;
    border-top: 1px solid var(--line);
}
.k-intent:last-child { padding-bottom: 0; }
.k-intent__head { position: sticky; top: calc(var(--header) + 5.4rem); align-self: start; }
.k-intent__glyph {
    width: 54px;
    height: 54px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    color: var(--accent);
    box-shadow: 0 0 0 1px var(--line-2), 0 0 0 5px var(--bg), 0 0 0 6px var(--line);
    margin: 6px 6px 1.8rem;
}
.k-intent__glyph .k-glyph { width: 22px; height: 22px; }
.k-intent__zh { margin-top: 0.9rem; font-size: 1.05rem; color: var(--accent-text); }
.k-intent__desc { margin-top: 1rem; color: var(--fg-2); max-width: 22rem; }

.k-stones { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(2.4rem, 4vw, 3.4rem) clamp(1.8rem, 3.4vw, 3.4rem); }
.k-stone { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 1.5rem; align-items: start; }
.k-stone__medal { --size: 84px; margin: 7px; }
.k-stone__name { font-family: var(--serif); font-weight: 400; font-size: 1.6rem; line-height: 1.12; color: var(--fg); letter-spacing: -0.01em; }
.k-stone__term { margin-top: 0.3rem; color: var(--accent-text); line-height: 1.4; }
.k-stone__pinyin { font-family: var(--serif); font-style: italic; font-size: 1.08rem; }
.k-stone__term .zh { font-size: 0.86rem; }
.k-stone__desc { margin-top: 0.85rem; font-size: 0.95rem; line-height: 1.75; color: var(--fg-2); }
.k-stone__use {
    display: flex;
    align-items: baseline;
    gap: 0.9rem;
    margin-top: 1rem;
    padding-top: 0.85rem;
    border-top: 1px solid var(--line);
    font-size: 0.88rem;
    line-height: 1.6;
    color: var(--fg);
}
.k-stone__use .small-caps { flex: none; font-size: 0.6rem; color: var(--accent-text); }

/* ============================================================
   II. BIRTHSTONES — the tray
   ============================================================ */
.k-months {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
}
.k-month {
    position: relative;
    text-align: center;
    padding: clamp(1.6rem, 3vw, 2.6rem) clamp(0.8rem, 1.6vw, 1.4rem) clamp(1.8rem, 3vw, 2.4rem);
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    transition: background-color 0.6s var(--ease);
}
.k-month:hover { background-color: var(--card); }
.k-month__stone { position: relative; width: min(100%, 168px); aspect-ratio: 1; margin: -0.6rem auto 0.4rem; }
.k-month__photo {
    --size: 58%;
    position: absolute;
    left: 50%;
    top: 46%;
    transform: translate(-50%, -50%);
    transition: opacity 1.2s var(--ease), transform 1.2s var(--ease);
}
.k-month__gem { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; transition: opacity 1.4s var(--ease); }
.k-month.is-cut .k-month__gem { opacity: 1; }
.k-month.is-cut .k-month__photo { opacity: 0; transform: translate(-50%, -50%) scale(0.86); }
.k-month__no { display: block; font-size: 0.62rem; letter-spacing: 0.3em; color: var(--fg-3); margin-bottom: 0.3rem; }
.k-month__name { font-family: var(--serif); font-weight: 300; font-style: italic; font-size: clamp(1.5rem, 2.3vw, 2rem); line-height: 1.1; color: var(--fg); }
.k-month__gemname { margin-top: 0.6rem; font-size: 0.68rem; letter-spacing: 0.24em; text-transform: uppercase; color: var(--accent-text); }
.k-month__virtue { margin-top: 0.35rem; font-size: 0.9rem; color: var(--fg-2); }
.k-month__virtue .k-amp { font-size: 1.15em; }

.k-actions { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 1.4rem 2.4rem; margin-top: clamp(3rem, 6vw, 4.5rem); }

/* ============================================================
   III. HOROSCOPE — a ledger of the signs
   ============================================================ */
.k-signs {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(2rem, 6vw, 6rem);
    border-top: 1px solid var(--line-2);
}
.k-sign {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: clamp(1rem, 2.4vw, 1.8rem);
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--line);
}
.k-sign__glyph {
    width: 58px;
    height: 58px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    margin: 6px;
    font-family: 'Segoe UI Symbol', 'Apple Symbols', 'Noto Sans Symbols', var(--serif);
    font-size: 1.5rem;
    line-height: 1;
    color: var(--accent-text);
    box-shadow: 0 0 0 1px var(--line-2), 0 0 0 5px var(--bg), 0 0 0 6px var(--line);
    transition: box-shadow 0.5s var(--ease);
}
.k-sign:hover .k-sign__glyph { box-shadow: 0 0 0 1px var(--accent), 0 0 0 5px var(--bg), 0 0 0 6px var(--line-2); }
.k-sign__name { font-family: var(--serif); font-weight: 400; font-size: clamp(1.5rem, 2.2vw, 1.85rem); line-height: 1.1; color: var(--fg); }
.k-sign__dates { margin-top: 0.3rem; font-size: 0.66rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--fg-3); }
.k-sign__gems { font-family: var(--serif); font-style: italic; font-size: clamp(1.1rem, 1.5vw, 1.3rem); line-height: 1.3; color: var(--fg); text-align: right; }
.k-sign__gems .k-amp { font-style: normal; }

/* ============================================================
   IV. CHINESE ZODIAC
   ============================================================ */
.k-horse {
    max-width: 900px;
    margin: 0 auto clamp(4rem, 8vw, 6.5rem);
    padding: clamp(2.8rem, 6vw, 4.6rem) clamp(1.6rem, 6vw, 4.6rem);
    text-align: center;
}
.k-horse .foil { background-image: linear-gradient(100deg, #6b5518 0%, #b08d35 40%, #d9b95c 52%, #8a6d22 70%, #6b5518 100%); }
.k-horse__badge { display: inline-flex; align-items: baseline; gap: 0.8rem; color: var(--accent-text); }
.k-horse__pinyin { font-size: 0.68rem; letter-spacing: 0.3em; text-transform: uppercase; }
.k-horse__badge .zh { font-size: 1.25rem; color: var(--fg); }
.k-horse__title { margin: 1rem auto 1.3rem; max-width: 16ch; }
.k-horse__sub { max-width: 34rem; margin: 0 auto; }
.k-horse__themes { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.8rem 1.1rem; margin-top: 2.2rem; }
.k-horse__themes li { display: inline-flex; align-items: center; gap: 1.1rem; font-size: 0.7rem; letter-spacing: 0.24em; text-transform: uppercase; color: var(--fg); }
.k-horse__themes .sparkle { width: 0.7em; height: 0.7em; color: var(--accent); }

.k-forecast { max-width: 1120px; margin: 0 auto; }
.k-forecast__bar { display: flex; justify-content: flex-end; margin-bottom: 1rem; min-height: 1.6rem; }

/* the fold row: numeral · name / years · rating · luck · gem · chevron */
.k-animal > summary {
    display: grid;
    grid-template-columns: 3rem minmax(0, 1fr) auto 12px;
    grid-template-areas: "num name meta chev" "num years meta chev";
    align-items: center;
    column-gap: clamp(1rem, 2.4vw, 2rem);
    row-gap: 0.15rem;
    padding: 1.5rem 0.6rem 1.5rem 0;
    transition: background-color 0.5s var(--ease);
}
.k-animal > summary::after { grid-area: chev; margin: 0; justify-self: end; }
.k-animal > summary:hover { background-color: var(--card); }
.k-animal__num { grid-area: num; align-self: center; font-family: var(--serif); font-style: italic; font-size: 1.05rem; color: var(--accent-text); text-align: center; }
.k-animal__name { grid-area: name; font-family: var(--serif); font-weight: 300; font-size: clamp(1.8rem, 3vw, 2.4rem); line-height: 1.05; color: var(--fg); letter-spacing: -0.01em; }
.k-yours {
    display: inline-block;
    margin-left: 0.8rem;
    padding: 0.28rem 0.75rem;
    border: 1px solid var(--line-2);
    border-radius: 100px;
    font-family: var(--sans);
    font-size: 0.58rem;
    font-weight: 400;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    vertical-align: 0.5em;
    font-style: normal;
    color: var(--accent-text);
    white-space: nowrap;
}
.k-animal__years { grid-area: years; font-size: 0.74rem; letter-spacing: 0.06em; color: var(--fg-3); }
.k-animal__meta { grid-area: meta; display: grid; grid-template-columns: 88px 9.5rem 8.5rem; align-items: center; gap: 1.2rem; }
.k-stars { display: inline-flex; gap: 5px; }
.k-stars svg { width: 12px; height: 12px; fill: var(--line); }
.k-stars svg.is-lit { fill: var(--accent); }
.k-animal__luck { font-size: 0.66rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--fg-2); }
.k-animal__gem { font-family: var(--serif); font-style: italic; font-size: 1.25rem; color: var(--fg); }

.k-animal.is-year > summary { background-image: linear-gradient(90deg, rgba(212, 175, 55, 0.08), transparent 65%); }
.k-animal.is-year > summary .k-animal__num { color: var(--accent); }
.k-animal[open] > summary .k-animal__name { font-style: italic; }

.k-animal__body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 2.1fr);
    gap: clamp(1.6rem, 4vw, 3.6rem);
    padding: 0.6rem 0 2.6rem calc(3rem + clamp(1rem, 2.4vw, 2rem));
}
.k-animal[open] .k-animal__body { animation: k-open 0.7s var(--ease) both; }
@keyframes k-open { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: none; } }

.k-rec { text-align: center; align-self: start; }
.k-rec__medal { --size: 86px; margin: 7px auto 1.3rem; }
.k-rec__name { font-family: var(--serif); font-weight: 400; font-size: 1.6rem; line-height: 1.15; color: var(--fg); }
.k-rec__benefit { margin-top: 0.35rem; font-size: 0.64rem; letter-spacing: 0.22em; text-transform: uppercase; color: var(--accent-text); }
.k-rec__benefit .k-amp { font-family: var(--sans); font-style: normal; }
.k-rec__text { margin: 1rem 0 1.3rem; font-size: 0.92rem; line-height: 1.7; color: var(--fg-2); }

.k-reading__intro { color: var(--fg); }
.k-cats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: 1.8rem; border-top: 1px solid var(--line); }
.k-cat { padding: 1.3rem 1.6rem 1.3rem 0; border-bottom: 1px solid var(--line); }
.k-cat:nth-child(even) { padding: 1.3rem 0 1.3rem 1.6rem; border-left: 1px solid var(--line); }
.k-cat__title { display: flex; align-items: center; gap: 0.6rem; font-family: var(--sans); font-weight: 400; font-size: 0.66rem; letter-spacing: 0.24em; text-transform: uppercase; color: var(--accent-text); margin-bottom: 0.55rem; }
.k-cat__title .k-glyph { width: 16px; height: 16px; color: var(--accent); }
.k-cat p { font-size: 0.93rem; line-height: 1.7; color: var(--fg-2); }

.k-disclaimer__rule { margin-top: clamp(3.5rem, 7vw, 5rem); }
.k-disclaimer { max-width: 40rem; margin: 1.6rem auto 0; text-align: center; font-size: 0.82rem; line-height: 1.85; color: var(--fg-3); }
.k-actions--end { margin-top: 2.6rem; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1080px) {
    .k-months { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .k-stones { grid-template-columns: minmax(0, 1fr); }
    .k-animal__meta { grid-template-columns: 80px 8.4rem 7.4rem; gap: 1rem; }
}

@media (max-width: 860px) {
    .k-intent { grid-template-columns: minmax(0, 1fr); gap: 2.4rem; }
    .k-intent__head { position: static; }
    .k-stones { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .k-signs { grid-template-columns: minmax(0, 1fr); }

    .k-animal > summary {
        grid-template-columns: 2.2rem minmax(0, 1fr) 12px;
        grid-template-areas: "num name chev" "num years chev" "num meta chev";
        row-gap: 0.35rem;
    }
    .k-animal__num { align-self: start; padding-top: 0.5rem; }
    .k-animal__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 0.2rem 1rem; margin-top: 0.4rem; }
    .k-animal__gem { flex-basis: 100%; }
    .k-animal__body { grid-template-columns: minmax(0, 1fr); padding-left: 0; }
    .k-rec { display: grid; grid-template-columns: auto minmax(0, 1fr); column-gap: 1.3rem; text-align: left; }
    .k-rec__medal { grid-row: span 4; margin: 7px; --size: 76px; }
    .k-rec .link { justify-self: start; }
}

@media (max-width: 760px) {
    .k-subnav a small { display: none; }
    .k-subnav .subnav__inner { gap: 0.3rem 1.6rem; }
    .k-subnav .subnav__inner { -webkit-mask-image: linear-gradient(90deg, #000 82%, transparent); mask-image: linear-gradient(90deg, #000 82%, transparent); }
}

@media (max-width: 640px) {
    .k-hero__ornament { width: 110vw; right: -62vw; top: 38%; opacity: 0.16; }
    .k-months { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .k-stones { grid-template-columns: minmax(0, 1fr); gap: 2.4rem; }
    .k-stone { gap: 1.1rem; }
    .k-stone__medal { --size: 68px; }
    .k-stone__name { font-size: 1.45rem; }
    .k-stone__use { flex-direction: column; gap: 0.2rem; }
    .k-cats { grid-template-columns: minmax(0, 1fr); }
    .k-cat, .k-cat:nth-child(even) { padding: 1.1rem 0; border-left: 0; }
    .k-sign { grid-template-columns: auto minmax(0, 1fr); row-gap: 0.4rem; }
    .k-sign__glyph { grid-row: span 2; width: 50px; height: 50px; font-size: 1.3rem; }
    .k-sign__gems { text-align: left; font-size: 1.1rem; }
    .k-horse__title { font-size: clamp(2rem, 9vw, 2.6rem); }
    .k-yours { margin: 0.5rem 0 0; display: table; vertical-align: baseline; }
}

@media (prefers-reduced-motion: reduce) {
    .k-hero__ornament .k-spin { animation: none; }
    .k-animal[open] .k-animal__body { animation: none; }
}