/*
 * 全局加载页：原版风格的方块世界。
 * 蓝天 + 方块云，中间一块慢慢转动的草方块，下面一排快捷栏依次装满物品、选中框跟着走，
 * 底部是草方块地面。纹理全部来自已登记的方块纹理与物品图标（valley-blocks-v1 /
 * stylized-village-v1 / items），不新增图片。
 *
 * 放在 public/ 由 index.html 直接引入：index.html 里的静态启动页和 React 的 BlockLoading
 * 用同一份样式、同样的标记，JS 加载完换成应用时看不出切换（不再先闪一下旧样式）。
 */

.block-loading {
  --bl-slot: 44px;
  --bl-cube: 72px;
  --bl-ground: 88px;
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  padding: 24px 24px calc(var(--bl-ground) + 20px);
  color: #fff;
  text-align: center;
  background: linear-gradient(180deg, #7ec4f2 0%, #a9dbf7 48%, #d5effb 100%);
  image-rendering: pixelated;
}
.block-loading.is-screen { min-height: 100dvh; }
.block-loading.is-slot {
  --bl-slot: 34px;
  --bl-cube: 54px;
  --bl-ground: 52px;
  position: absolute;
  inset: 0;
  z-index: 5;
  padding: 12px 12px calc(var(--bl-ground) + 10px);
}

/* ── 方块云 ─────────────────────────────────────────────── */
.block-loading-clouds { position: absolute; inset: 0; pointer-events: none; }
.block-loading-clouds i {
  position: absolute;
  top: 12%;
  left: -30%;
  width: 180px;
  height: 28px;
  background: rgba(255, 255, 255, .88);
  box-shadow: 36px -18px 0 rgba(255, 255, 255, .88), 72px -18px 0 rgba(255, 255, 255, .88), 108px 0 0 rgba(255, 255, 255, .88);
  animation: bl-cloud 46s linear infinite;
  animation-delay: var(--bl-elapsed, 0s);
}
.block-loading-clouds i:nth-child(2) { top: 26%; width: 120px; animation-duration: 62s; animation-delay: calc(-24s + var(--bl-elapsed, 0s)); opacity: .8; }
.block-loading-clouds i:nth-child(3) { top: 6%; width: 150px; animation-duration: 54s; animation-delay: calc(-40s + var(--bl-elapsed, 0s)); opacity: .7; }
@keyframes bl-cloud { to { transform: translateX(170vw); } }

/* ── 地面：一排草方块，下面是泥土 ─────────────────────────── */
.block-loading-ground {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: var(--bl-ground);
  background:
    url('/assets/minecraft/valley-blocks-v1/grass_block_side.png') 0 0 / calc(var(--bl-ground) / 2) calc(var(--bl-ground) / 2) repeat-x,
    url('/assets/minecraft/valley-blocks-v1/dirt.png') 0 0 / calc(var(--bl-ground) / 2) calc(var(--bl-ground) / 2) repeat;
  box-shadow: inset 0 6px 0 rgba(255, 255, 255, .12);
}

/* ── 中间：方块 + 标题 + 快捷栏 ──────────────────────────── */
.block-loading-stage {
  position: relative;
  z-index: 1;
  display: grid;
  justify-items: center;
  gap: 14px;
  max-width: min(560px, 100%);
}

.block-loading-cube {
  position: relative;
  width: var(--bl-cube);
  height: var(--bl-cube);
  margin: 6px 0 10px;
  transform-style: preserve-3d;
  animation: bl-spin 9s linear infinite, bl-bob 2.4s ease-in-out infinite alternate;
  animation-delay: var(--bl-elapsed, 0s);
}
.block-loading-cube i {
  position: absolute;
  inset: 0;
  background-size: 100% 100%;
  image-rendering: pixelated;
  backface-visibility: hidden;
}
.block-loading-cube .top { background-image: url('/assets/minecraft/stylized-village-v1/grass_block_top.png'); transform: rotateX(90deg) translateZ(calc(var(--bl-cube) / 2)); }
.block-loading-cube .bottom { background-image: url('/assets/minecraft/valley-blocks-v1/dirt.png'); transform: rotateX(-90deg) translateZ(calc(var(--bl-cube) / 2)); filter: brightness(.6); }
.block-loading-cube .front { background-image: url('/assets/minecraft/valley-blocks-v1/grass_block_side.png'); transform: translateZ(calc(var(--bl-cube) / 2)); filter: brightness(.92); }
.block-loading-cube .back { background-image: url('/assets/minecraft/valley-blocks-v1/grass_block_side.png'); transform: rotateY(180deg) translateZ(calc(var(--bl-cube) / 2)); filter: brightness(.8); }
.block-loading-cube .right { background-image: url('/assets/minecraft/valley-blocks-v1/grass_block_side.png'); transform: rotateY(90deg) translateZ(calc(var(--bl-cube) / 2)); filter: brightness(.74); }
.block-loading-cube .left { background-image: url('/assets/minecraft/valley-blocks-v1/grass_block_side.png'); transform: rotateY(-90deg) translateZ(calc(var(--bl-cube) / 2)); filter: brightness(.86); }
@keyframes bl-spin { from { transform: rotateX(-26deg) rotateY(0deg); } to { transform: rotateX(-26deg) rotateY(360deg); } }
@keyframes bl-bob { from { translate: 0 0; } to { translate: 0 -8px; } }

.block-loading-title {
  color: #fff;
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 900;
  letter-spacing: .08em;
  /* 原版文字那种偏移的深色投影，读起来像游戏里的标题 */
  text-shadow: 3px 3px 0 #3f3f3f;
}
.is-slot .block-loading-title { font-size: clamp(16px, 1.8vw, 20px); text-shadow: 2px 2px 0 #3f3f3f; }

/* 快捷栏：原版的深灰槽位 + 立体边；物品依次装进去，选中框跟着走 */
.block-loading-hotbar {
  position: relative;
  display: flex;
  padding: 3px;
  background: rgba(24, 24, 24, .72);
  border: 2px solid #111;
  box-shadow: 0 6px 18px rgba(20, 50, 70, .25);
}
.block-loading-hotbar i {
  position: relative;
  display: grid;
  place-items: center;
  width: var(--bl-slot);
  height: var(--bl-slot);
  background: rgba(139, 139, 139, .35);
  box-shadow: inset 2px 2px 0 rgba(0, 0, 0, .35), inset -2px -2px 0 rgba(255, 255, 255, .22);
}
.block-loading-hotbar img {
  width: 72%;
  height: 72%;
  object-fit: contain;
  image-rendering: pixelated;
  opacity: 0;
  animation: bl-item 4.5s ease-out infinite;
  animation-delay: calc(var(--slot) * .36s + var(--bl-elapsed, 0s));
}
.block-loading-selector {
  position: absolute;
  top: 0;
  left: 0;
  width: calc(var(--bl-slot) + 6px);
  height: calc(var(--bl-slot) + 6px);
  border: 3px solid #fff;
  box-shadow: 0 0 0 1px #111, inset 0 0 0 1px #111;
  animation: bl-select 4.5s infinite;
  animation-timing-function: steps(8, end);
  animation-delay: var(--bl-elapsed, 0s);
}
@keyframes bl-item {
  0% { opacity: 0; transform: scale(.3); }
  6% { opacity: 1; transform: scale(1.2); }
  10% { transform: scale(1); }
  82% { opacity: 1; transform: scale(1); }
  92%, 100% { opacity: 0; transform: scale(.8); }
}
@keyframes bl-select {
  0% { transform: translateX(0); }
  64%, 100% { transform: translateX(calc(var(--bl-slot) * 8)); }
}

.block-loading-hint {
  color: #2f4a3c;
  font-size: clamp(12px, 1.1vw, 14px);
  font-weight: 800;
}

.block-loading-tip {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 2px 0 0;
  padding: 7px 14px;
  background: rgba(24, 24, 24, .55);
  color: #fff;
  font-size: clamp(12px, 1.2vw, 14px);
  font-weight: 700;
}
/* 只在换到下一条时淡入；从启动页接过来的第一条不动，免得闪一下 */
.block-loading-tip.is-rotated { animation: bl-tip .5s ease-out; }
.block-loading-tip span { color: #ffe36b; font-weight: 900; }
@keyframes bl-tip { from { opacity: 0; transform: translateY(4px); } }

@media (max-height: 450px) {
  .block-loading { --bl-slot: 32px; --bl-cube: 48px; --bl-ground: 44px; }
  .block-loading-stage { gap: 8px; }
  .block-loading-cube { margin: 2px 0 6px; }
}
@media (max-width: 480px) {
  .block-loading { --bl-slot: 30px; }
}

@media (prefers-reduced-motion: reduce) {
  .block-loading-cube, .block-loading-clouds i, .block-loading-selector, .block-loading-tip { animation: none; }
  .block-loading-cube { transform: rotateX(-26deg) rotateY(38deg); }
  .block-loading-hotbar img { animation: none; opacity: 1; }
}