/* ============================================================
   sealed.css — 封印之间（画廊内的加密图片区）
   依赖 variables.css 中的羊皮纸 / 墨色 / 光晕变量
   ============================================================ */

/* 滤镜定义：不占位、不可见，仅供 filter: url(#sealed-corrupt) 引用 */
.sealed-defs {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

/* 挂在外形特征画廊之后，归属于同一个区块 */
.sealed-gallery {
    margin-top: 2.5rem;
}

.sealed-title {
    font-family: var(--font-header);
    font-size: clamp(1.05rem, 2.4vw, 1.25rem);
    color: var(--ink-blood);
    letter-spacing: 2px;
    text-align: center;
    margin: 0 0 0.4rem;
}

.sealed-hint {
    font-family: var(--font-body);
    font-style: italic;
    color: var(--ink-sepia);
    text-align: center;
    min-height: 1.6em;
    margin: 0 0 1rem;
}

/* 与 .carousel-main-display 同款的墨色画框 */
.sealed-stage {
    position: relative;
    min-height: 260px;
    padding: 16px;
    background: var(--ink-iron);
    border: 2px solid var(--ink-gold);
    box-shadow:
        0 8px 30px var(--shadow-heavy),
        inset 0 0 20px rgba(184, 134, 11, 0.05);
    overflow: hidden;
}

/* ── 封印：可点击的损坏区域 ─────────────────────────────── */
.sealed-cover {
    -webkit-appearance: none;
    appearance: none;
    position: absolute;
    inset: 0;
    z-index: 3;
    display: grid;
    place-items: center;
    margin: 0;
    padding: 0;
    border: 0;
    border-radius: 0;
    background:
        radial-gradient(circle at 50% 45%, rgba(139, 0, 0, 0.35), transparent 60%),
        var(--ink-iron);
    color: var(--ink-gold);
    font: inherit;
    cursor: pointer;
    filter: url(#sealed-corrupt);      /* 损坏的核心：位移随点击加深 */
    transition: opacity 0.25s ease;
    -webkit-tap-highlight-color: transparent;
}

/* 表面颗粒（噪点用 data URI，不需要额外图片文件） */
.sealed-cover::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0.5;
    mix-blend-mode: overlay;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.sealed-cover:hover .sealed-sigil { color: var(--flow-gold-mid); }
.sealed-cover:active .sealed-sigil { transform: scale(0.96); }
.sealed-cover:focus-visible { outline: 2px dashed var(--ink-gold); outline-offset: -10px; }
.sealed-cover.is-breaking { opacity: 0; pointer-events: none; }

.sealed-sigil {
    position: relative;
    width: clamp(72px, 22vw, 104px);
    height: clamp(72px, 22vw, 104px);
    transition: color 0.2s ease, transform 0.15s ease;
}

.sealed-cracks {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.sealed-crack {
    fill: none;
    stroke: var(--flow-blood-end);
    stroke-width: 1.6;
    stroke-linecap: round;
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
    filter: drop-shadow(0 0 3px var(--flow-blood-mid));
    animation: sealedDraw 0.45s ease-out forwards;
}

@keyframes sealedDraw {
    to { stroke-dashoffset: 0; }
}

/* ── 碎片与闪光（由 JS 动态生成） ───────────────────────── */
.sealed-shard {
    position: absolute;
    inset: 0;
    z-index: 2;
    background: var(--ink-iron);
    pointer-events: none;
}

.sealed-flash {
    position: absolute;
    inset: 0;
    z-index: 5;
    pointer-events: none;
    mix-blend-mode: screen;
    background: radial-gradient(circle,
        rgba(255, 220, 150, 0.85),
        rgba(218, 165, 32, 0.3) 60%,
        transparent 80%);
}

/* ── 解封后的图片 ───────────────────────────────────────── */
.sealed-reveal {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    outline: none;
}

.sealed-reveal[hidden] { display: none; }

.sealed-item { margin: 0; }

.sealed-item img {
    display: block;
    width: 100%;
    height: auto;
    border: 2px solid var(--ink-gold);
    border-radius: 2px;
    box-shadow: 0 6px 18px var(--shadow-heavy);
    cursor: zoom-in;
}

.sealed-item figcaption {
    margin-top: 6px;
    text-align: center;
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--parchment-old);
}

@media (prefers-reduced-motion: reduce) {
    .sealed-crack { animation: none; stroke-dashoffset: 0; }
}