/* ============================================================
   Pixel Reveal · 展开卡片面板
   契约：.card-overlay(.show) > .card-expanded(.active, FLIP 由 JS 驱动)
   ============================================================ */

/* 遮罩容器 - 默认隐藏 */
.card-overlay{
  position:fixed;inset:0;z-index:100;
  display:none;align-items:center;justify-content:center;
  perspective:1200px;
}
.card-overlay.show{display:flex}

/* 模糊背景 */
.card-overlay::before{
  content:'';position:absolute;inset:0;
  backdrop-filter:var(--blur-heavy);
  -webkit-backdrop-filter:var(--blur-heavy);
  background:
    radial-gradient(90% 60% at 50% 0%,rgba(var(--accent-rgb),.06) 0%,transparent 60%),
    rgba(4,4,8,.66);
  opacity:0;transition:opacity .4s var(--ease-out);
}
.card-overlay.show::before{opacity:1}

/* ===== 展开卡片 ===== */
.card-expanded{
  display:none;position:relative;
  width:92vw;max-width:980px;
  height:min(600px,86vh);
  min-height:520px;
  border-radius:var(--radius-xl);
  background:linear-gradient(180deg,rgba(22,21,30,.92),rgba(12,12,18,.96));
  border:1px solid var(--border-strong);
  box-shadow:var(--shadow-3),inset 0 1px 0 rgba(255,255,255,.08);
  backdrop-filter:var(--blur);
  -webkit-backdrop-filter:var(--blur);
  flex-direction:column;
  overflow:hidden;
  z-index:101;
  transform-style:preserve-3d;
  will-change:transform;
  transition:transform .15s ease;
}
.card-expanded.active{display:flex}

/* 内层容器：继承 flex 布局，使 body 的 flex:1 真正撑开面板 */
.card-expanded-inner{
  flex:1;
  display:flex;
  flex-direction:column;
  min-height:0;
}

/* 顶部高光条 */
.card-expanded::before{
  content:'';position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(var(--accent-rgb),.5),transparent);
  z-index:103;
}

/* 关闭按钮 */
.card-close-btn{
  position:absolute;top:20px;right:20px;
  width:38px;height:38px;border-radius:50%;
  border:1px solid var(--border);
  background:var(--surface-2);
  color:var(--text-2);
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;
  transition:background .2s ease,color .2s ease,transform .15s ease,border-color .2s ease;
  z-index:102;
}
.card-close-btn:hover{background:var(--surface-3);color:var(--text-1);border-color:var(--border-strong)}
.card-close-btn:active{transform:scale(.9)}
.card-close-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ===== 头部 ===== */
.card-expanded-header{
  display:flex;align-items:center;gap:12px;
  padding:24px 76px 0 28px;flex-shrink:0;
}
.card-expanded-index{
  flex-shrink:0;
  min-width:34px;height:34px;padding:0 8px;
  display:flex;align-items:center;justify-content:center;
  border-radius:10px;
  font-size:14px;font-weight:800;
  color:rgba(var(--accent-rgb),1);
  background:rgba(var(--accent-rgb),.1);
  border:1px solid rgba(var(--accent-rgb),.28);
  letter-spacing:.02em;
}
.card-expanded-title{
  font-size:22px;font-weight:700;color:var(--text-1);
  letter-spacing:-.01em;
}
.card-expanded-cat{
  margin-left:auto;
  padding:5px 12px;border-radius:100px;
  font-size:10px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;
  color:var(--text-2);
  background:var(--surface);
  border:1px solid var(--border);
  white-space:nowrap;
}

/* ===== 主体：左右分栏 ===== */
.card-expanded-body{
  flex:1;display:flex;flex-direction:row;gap:24px;
  padding:18px 28px 28px;overflow:hidden;min-height:0;
}

/* 左侧：预览区 */
.card-expanded-left{
  flex:1;display:flex;align-items:center;justify-content:center;
  min-width:0;min-height:0;
  border-radius:var(--radius-m);
  background:
    radial-gradient(120% 100% at 50% 0%,rgba(255,255,255,.06) 0%,transparent 55%),
    repeating-conic-gradient(rgba(255,255,255,.022) 0% 25%,transparent 0% 50%) 0 0/22px 22px,
    rgba(0,0,0,.3);
  box-shadow:inset 0 0 0 1px var(--border),inset 0 8px 32px rgba(0,0,0,.35);
  overflow:hidden;
}

/* 右侧：控制区 */
.card-expanded-right{
  flex:1;display:flex;flex-direction:column;justify-content:center;gap:14px;
  min-width:0;
}

/* ===== 图片预览 ===== */
.card-img-preview{width:100%;height:100%;display:flex;align-items:center;justify-content:center;position:relative}

.preview-placeholder{
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;
  color:var(--text-3);font-size:13px;font-weight:500;
}
.preview-placeholder svg{opacity:.55}

.card-img-preview .preview-thumb{
  max-width:calc(100% - 32px);max-height:calc(100% - 32px);
  width:auto;height:auto;object-fit:contain;
  border-radius:12px;display:none;
  box-shadow:var(--shadow-2);
}
.card-img-preview .preview-thumb.show{display:block}

/* ===== 右侧控件通用 ===== */
.card-expanded-right .cover-options,
.card-expanded-right .action-row,
.card-expanded-right .progress-wrap{width:100%;max-width:none}

/* ===== 上传按钮 ===== */
.card-upload-btn{
  width:100%;height:58px;border-radius:var(--radius-m);
  border:1.5px dashed rgba(255,255,255,.22);
  background:var(--surface);
  color:var(--text-2);font-size:15px;font-weight:500;gap:10px;
  transition:border-color .25s ease,background .25s ease,color .25s ease,transform .15s ease;
}
.card-upload-btn:hover{
  border-color:rgba(var(--accent-rgb),.5);
  background:rgba(var(--accent-rgb),.06);
  color:var(--text-1);
}
.card-upload-btn:active{transform:scale(.98)}
.card-upload-btn.drag-over{
  border-color:var(--accent);
  background:rgba(var(--accent-rgb),.14);
  color:#fff;
  box-shadow:0 0 24px rgba(var(--accent-rgb),.18);
}
.card-upload-btn svg{opacity:.6;transition:opacity .2s ease}
.card-upload-btn:hover svg{opacity:.9}
.card-upload-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ===== 封面选项（分段控件） ===== */
.card-expanded-body .cover-options{
  width:100%;max-width:none;
  flex-direction:column;align-items:stretch;justify-content:center;
  margin-bottom:0;gap:0;
  border:1px solid var(--border);
  border-radius:var(--radius-m);
  padding:0;overflow:hidden;
  background:var(--surface);
}
.card-expanded-body .cover-label{
  color:var(--text-3);font-size:11px;font-weight:600;
  letter-spacing:.1em;text-transform:uppercase;
  padding:10px 16px;
  background:var(--surface-2);
  border-bottom:1px solid var(--border);
}
.card-expanded-body .cover-btns{display:flex;gap:0;padding:6px}
.card-expanded-body .cover-btn{
  flex:1;height:44px;padding:0 14px;border-radius:11px;
  font-size:13px;font-weight:500;
  background:transparent;color:var(--text-2);border:none;
  transition:background .25s ease,color .25s ease,box-shadow .25s ease;
}
.card-expanded-body .cover-btn.selected{
  background:rgba(var(--accent-rgb),.12);
  color:#fff;font-weight:600;
  box-shadow:inset 0 0 0 1px rgba(var(--accent-rgb),.3);
}
.card-expanded-body .cover-btn:hover:not(.selected){background:var(--surface-3);color:var(--text-1)}
.card-expanded-body .cover-btn:active{transform:scale(.97)}
.card-expanded-body .cover-btn:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}

/* ===== 操作按钮 ===== */
.card-expanded-body .action-row{width:100%;max-width:none;flex-direction:column;gap:10px}

.card-expanded-body .btn-secondary{
  height:48px;border-radius:var(--radius-m);
  font-size:14px;font-weight:500;
  background:var(--surface);color:var(--text-2);
  border:1px solid var(--border);
}
.card-expanded-body .btn-secondary:hover{
  background:var(--surface-3);color:var(--text-1);border-color:var(--border-strong);
}
.card-expanded-body .btn-secondary:active{transform:scale(.98);transition-duration:.08s}

.card-expanded-body .btn-primary{
  height:58px;border-radius:var(--radius-m);
  font-size:16px;font-weight:600;width:100%;
  background:linear-gradient(135deg,var(--accent),color-mix(in srgb,var(--accent),#b8371a 35%));
  color:#fff;border-color:transparent;
  box-shadow:0 6px 20px rgba(var(--accent-rgb),.28),inset 0 1px 0 rgba(255,255,255,.22);
}
.card-expanded-body .btn-primary:hover{
  background:linear-gradient(135deg,color-mix(in srgb,var(--accent),#fff 8%),var(--accent));
  box-shadow:0 8px 28px rgba(var(--accent-rgb),.4),inset 0 1px 0 rgba(255,255,255,.22);
  transform:translateY(-1px);
}
.card-expanded-body .btn-primary:active{transform:scale(.98);transition-duration:.08s}

/* ===== 进度条 ===== */
.card-expanded-body .progress-wrap{width:100%;margin-top:0}
.card-expanded-body .progress-bar{
  height:4px;border-radius:2px;
  background:var(--surface-3);overflow:hidden;
}
.card-expanded-body .progress-fill{
  background:linear-gradient(90deg,var(--accent),var(--accent-2));
  border-radius:2px;
}
.card-expanded-body .progress-text{color:var(--text-3);font-size:11px}

/* ===== 响应式：移动端全屏抽屉 ===== */
@media(max-width:600px){
  .card-overlay{align-items:flex-end}
  .card-expanded{
    width:100%;max-width:none;
    height:auto;
    min-height:0;
    max-height:94dvh;
    border-radius:24px 24px 0 0;
  }
  .card-expanded-header{padding:20px 64px 0 20px}
  .card-expanded-cat{display:none}
  .card-expanded-body{flex-direction:column;padding:16px 20px 24px;gap:14px;overflow-y:auto}
  .card-expanded-left{flex:none;height:220px;border-radius:14px}
  .card-expanded-right{gap:10px}
  .card-expanded-title{font-size:19px}
  .card-upload-btn{height:48px;font-size:14px}
  .card-expanded-body .btn-primary{height:52px;font-size:15px}
  .card-expanded-body .btn-secondary{height:42px;font-size:13px}
  .preview-placeholder svg{width:36px;height:36px}
  .card-close-btn{top:16px;right:16px}
}
@media(min-width:600px) and (max-width:900px){
  .card-expanded{max-width:88vw}
}

/* ===== 减弱动画 ===== */
@media(prefers-reduced-motion:reduce){
  .card-expanded.active{animation-duration:0.01ms!important}
  .card-overlay::before{transition-duration:0.01ms!important}
}