/* Kotori*Gallery - fresh white gallery */
:root {
    --bg: #fdfdfb;
    --ink: #3c4a3f;
    --ink-soft: #6d7f70;
    --gold: #b3a06a;
    --frame-line: #ddd6c4;
}

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

body {
    background: var(--bg);
    color: var(--ink);
    font-family: "Hiragino Mincho ProN", "Hiragino Mincho Pro", "Yu Mincho", "YuMincho", serif;
    line-height: 1.9;
    -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }

/* botanical corners */
.botanical {
    position: fixed;
    z-index: 0;
    pointer-events: none;
    mix-blend-mode: multiply;
    opacity: 0.85;
}
.botanical--tr { top: 0; right: 0; width: min(340px, 44vw); }
.botanical--bl { bottom: 0; left: 0; width: min(340px, 44vw); }

main, footer, .site-head { position: relative; z-index: 1; }

/* ---------- Top ---------- */
.hero {
    max-width: 760px;
    margin: 0 auto;
    padding: 15vh 1.5rem 3rem;
    text-align: center;
}
.hero h1 {
    font-size: clamp(2rem, 6vw, 3.2rem);
    font-weight: 500;
    letter-spacing: 0.12em;
}
.hero h1 .star { color: var(--gold); }
.hero__lead {
    margin-top: 2.2rem;
    color: var(--ink-soft);
    font-size: 0.98rem;
}
.hero__note {
    margin-top: 1.6rem;
    font-size: 0.8rem;
    color: var(--ink-soft);
}
.hero__visual {
    margin: 0 auto;
    padding: 0 1.5rem;
    text-align: center;
}

.hero__diamond {
    width: min(320px, 68vw);
    margin: 2.8rem auto 0;
    filter: drop-shadow(0 18px 28px rgba(70, 84, 62, 0.28));
}
.btn {
    display: inline-block;
    margin-top: 2.6rem;
    padding: 0.7rem 2.6rem;
    border: 1px solid var(--gold);
    border-radius: 999px;
    color: var(--ink);
    text-decoration: none;
    letter-spacing: 0.25em;
    font-size: 0.9rem;
    background: rgba(255, 255, 255, 0.7);
    transition: background 0.25s, color 0.25s;
}
.btn:hover { background: var(--gold); color: #fff; }

/* framed picture */
.frame {
    background: #fff;
    padding: 10px 10px 10px;
    border: 1px solid var(--frame-line);
    box-shadow: 0 12px 32px rgba(70, 84, 62, 0.13), inset 0 0 0 4px #fff, inset 0 0 0 5px #eee7d6;
}
.frame img { width: 100%; height: 100%; object-fit: cover; }

/* ---------- Works ---------- */
.site-head {
    max-width: 1080px;
    margin: 0 auto;
    padding: 3.2rem 1.5rem 0.5rem;
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
}
.site-head h1 { font-size: 1.5rem; font-weight: 500; letter-spacing: 0.12em; }
.site-head h1 .star { color: var(--gold); }
.site-head a { color: var(--ink-soft); text-decoration: none; font-size: 0.85rem; letter-spacing: 0.15em; }
.site-head a:hover { color: var(--ink); }

.collage {
    max-width: 1080px;
    margin: 0 auto;
    padding: 1.6rem 1.5rem 5rem;
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    grid-auto-rows: 104px;
    grid-auto-flow: dense;
    gap: 1.3rem;
}
.collage .frame { cursor: zoom-in; }
.collage .s-std    { grid-column: span 3; grid-row: span 2; }
.collage .s-wide   { grid-column: span 4; grid-row: span 2; }
.collage .s-tall   { grid-column: span 2; grid-row: span 3; }
.collage .s-square { grid-column: span 2; grid-row: span 2; }
.collage .s-big    { grid-column: span 3; grid-row: span 3; }
.collage .s-banner { grid-column: span 6; grid-row: span 2; }

@media (max-width: 767px) {
    .collage {
        grid-template-columns: repeat(4, 1fr);
        grid-auto-rows: 76px;
        gap: 0.9rem;
        padding: 1.2rem 1rem 4rem;
    }
    .collage .s-std    { grid-column: span 2; grid-row: span 2; }
    .collage .s-wide   { grid-column: span 4; grid-row: span 2; }
    .collage .s-tall   { grid-column: span 2; grid-row: span 3; }
    .collage .s-square { grid-column: span 2; grid-row: span 2; }
    .collage .s-big    { grid-column: span 4; grid-row: span 3; }
    .collage .s-banner { grid-column: span 4; grid-row: span 1; }
    .frame { padding: 6px; }
}

/* ---------- Lightbox ---------- */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 50;
    display: none;
    align-items: center;
    justify-content: center;
    background: rgba(24, 30, 24, 0.94);
}
.lightbox.is-open { display: flex; }
.lightbox img {
    max-width: 92vw;
    max-height: 86vh;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    background: #fff;
    padding: 8px;
}
.lightbox__btn {
    position: absolute;
    border: 0;
    background: none;
    color: #e8ede6;
    font-size: 2rem;
    cursor: pointer;
    padding: 1rem;
    line-height: 1;
}
.lightbox__close { top: 0.5rem; right: 0.8rem; }
.lightbox__prev { left: 0.4rem; top: 50%; transform: translateY(-50%); }
.lightbox__next { right: 0.4rem; top: 50%; transform: translateY(-50%); }

footer {
    text-align: center;
    padding: 2.5rem 1rem 3rem;
    color: var(--ink-soft);
    font-size: 0.8rem;
    letter-spacing: 0.12em;
}