/* ╔══════════════════════════════════════════════╗
   ║  PPT 在线预览 — PowerPoint 风格 UI          ║
   ╚══════════════════════════════════════════════╝ */

:root {
    --ppt-bg: #1a1a2e;
    --ppt-sidebar-bg: #16213e;
    --ppt-surface: #3c3c40;
    --ppt-slide-bg: #ffffff;
    --ppt-accent: #d24726;
    --ppt-accent-hover: #b33a1e;
    --ppt-text: #e0e0e0;
    --ppt-text-dim: #999;
    --ppt-border: #333;
    --ppt-thumb-active: #d24726;
    --ppt-transition: 0.2s ease;
}

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

html, body { height: 100%; overflow: hidden; font-family: "Segoe UI","Microsoft YaHei",sans-serif; font-size: 13px; background: var(--ppt-bg); color: var(--ppt-text); }

.ppt-app { display: flex; flex-direction: column; height: 100vh; }

/* ═══════════════ 1. 上传 ═══════════════ */
.ppt-upload-overlay { flex: 1; display: flex; align-items: center; justify-content: center; background: var(--ppt-bg); }
.ppt-dropzone { width: 480px; padding: 48px 32px; background: var(--ppt-sidebar-bg); border: 2px dashed #444; border-radius: 12px; text-align: center; cursor: pointer; transition: all .3s; }
.ppt-dropzone:hover { border-color: var(--ppt-accent); box-shadow: 0 0 30px rgba(210,71,38,.15); }
.ppt-upload-icon { font-size: 64px; margin-bottom: 16px; }
.ppt-upload-title { font-size: 18px; color: #fff; margin-bottom: 8px; }
.ppt-upload-sub { font-size: 13px; color: var(--ppt-text-dim); margin-bottom: 12px; }
.ppt-upload-btn { display: inline-block; padding: 10px 32px; background: var(--ppt-accent); color: #fff; border: none; border-radius: 6px; font-size: 14px; cursor: pointer; transition: background .2s; }
.ppt-upload-btn:hover { background: var(--ppt-accent-hover); }
.ppt-upload-limit { margin-top: 16px; font-size: 11px; color: var(--ppt-text-dim); }

.ppt-spinner { width: 36px; height: 36px; border: 3px solid #444; border-top-color: var(--ppt-accent); border-radius: 50%; animation: ppt-spin .7s linear infinite; margin: 0 auto 12px; }
@keyframes ppt-spin { to { transform: rotate(360deg); } }

/* ═══════════════ 2. 预览主界面 ═══════════════ */
.ppt-preview-container { flex: 1; display: flex; overflow: hidden; }

/* 主视图 */
.ppt-main { flex: 1; display: flex; align-items: center; justify-content: center; background: var(--ppt-surface); overflow: auto; min-height: 0; }
.ppt-slide-area { position: relative; display: flex; align-items: center; justify-content: center; min-width: 0; min-height: 0; user-select: none; -webkit-user-select: none; }
.ppt-slide-wrapper { overflow: hidden; flex-shrink: 0; }
.ppt-slide-canvas { position: relative; background: #fff; box-shadow: 0 0 0 1px rgba(0,0,0,.12), 0 4px 24px rgba(0,0,0,.35); overflow: hidden; transform-origin: top left; color: #333; border-radius: 3.6px; }

/* 幻灯片元素 */
.ppt-element { position: absolute; pointer-events: none; }
.ppt-element.text-box { display: block; overflow: visible; word-wrap: break-word; overflow-wrap: break-word; white-space: normal; }
.ppt-element.picture img { width: 100%; height: 100%; object-fit: fill; display: block; }
.ppt-element.shape img { width: 100%; height: 100%; }
.ppt-element.chart { background: #fff; border: 1px solid #ddd; border-radius: 4px; padding: 4px; }
.ppt-element.media { pointer-events: auto; cursor: pointer; }
.ppt-element.media video { background: #000; }
.ppt-element.media:hover { filter: brightness(1.1); transition: filter .15s; }

/* ═══════════════ 3. 状态栏 ═══════════════ */
.ppt-status-bar { display: flex; align-items: center; height: 28px; min-height: 28px; background: var(--ppt-sidebar-bg); border-top: 1px solid var(--ppt-border); padding: 0 12px; gap: 8px; font-size: 11px; color: var(--ppt-text-dim); user-select: none; z-index: 10; }
.ppt-status-sep { color: #444; }
.ppt-status-right { margin-left: auto; display: flex; align-items: center; gap: 8px; }

.ppt-anim-btn { padding: 2px 10px; background: var(--ppt-accent); color: #fff; border: none; border-radius: 3px; font-size: 11px; cursor: pointer; transition: background .15s; }
.ppt-anim-btn:hover { background: var(--ppt-accent-hover); }

.ppt-nav-btn { padding: 2px 10px; background: transparent; color: var(--ppt-text-dim); border: 1px solid #444; border-radius: 3px; font-size: 11px; cursor: pointer; transition: all .15s; }
.ppt-nav-btn:hover { background: #333; color: #fff; border-color: #555; }
.ppt-nav-btn:disabled { opacity: 0.35; cursor: default; }
.ppt-nav-btn:disabled:hover { background: transparent; color: var(--ppt-text-dim); border-color: #444; }

.ppt-zoom-control { display: flex; align-items: center; gap: 4px; }
.ppt-zoom-btn { width: 20px; height: 20px; border: 1px solid #444; background: transparent; color: var(--ppt-text-dim); font-size: 14px; cursor: pointer; border-radius: 3px; display: flex; align-items: center; justify-content: center; }
.ppt-zoom-btn:hover { background: #333; color: #fff; }
.ppt-zoom-slider { width: 60px; height: 3px; accent-color: var(--ppt-accent); }
.ppt-zoom-label { min-width: 32px; text-align: center; font-variant-numeric: tabular-nums; }

/* ═══════════════ 4. Toast ═══════════════ */
.ppt-toast { position: fixed; bottom: 48px; left: 50%; transform: translateX(-50%); display: flex; align-items: center; gap: 10px; padding: 10px 20px; background: #fff; border-left: 4px solid #d13438; border-radius: 6px; box-shadow: 0 6px 24px rgba(0,0,0,.3); z-index: 9999; font-size: 13px; color: #333; animation: ppt-toast-in .3s ease; max-width: 400px; }
.ppt-toast .toast-icon { font-size: 18px; }
.ppt-toast .toast-msg { flex: 1; }
.ppt-toast .toast-close { cursor: pointer; font-size: 18px; color: #999; padding: 0 4px; }
@keyframes ppt-toast-in { from { opacity: 0; transform: translateX(-50%) translateY(12px); } }

/* ═══════════════ 5. 动画关键帧 ═══════════════ */
@keyframes ppt-spin-anim { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes ppt-teeter-anim { 0%,100% { transform: rotate(0deg); } 25% { transform: rotate(8deg); } 50% { transform: rotate(-6deg); } 75% { transform: rotate(4deg); } }

/* whip 挥鞭式 */
@keyframes ppt-whip-l { 0%{transform:translateX(100%) rotate(35deg);opacity:0} 55%{transform:translateX(0) rotate(-12deg);opacity:.8} 75%{transform:rotate(5deg);opacity:1} 100%{transform:rotate(0deg);opacity:1} }
@keyframes ppt-whip-r { 0%{transform:translateX(-100%) rotate(-35deg);opacity:0} 55%{transform:translateX(0) rotate(12deg);opacity:.8} 75%{transform:rotate(-5deg);opacity:1} 100%{transform:rotate(0deg);opacity:1} }
@keyframes ppt-whip-t { 0%{transform:translateY(100%) rotate(25deg);opacity:0} 55%{transform:translateY(0) rotate(-8deg);opacity:.8} 75%{transform:rotate(3deg);opacity:1} 100%{transform:rotate(0deg);opacity:1} }
@keyframes ppt-whip-b { 0%{transform:translateY(-100%) rotate(-25deg);opacity:0} 55%{transform:translateY(0) rotate(8deg);opacity:.8} 75%{transform:rotate(-3deg);opacity:1} 100%{transform:rotate(0deg);opacity:1} }

/* fly 飞入 (简化) */
@keyframes ppt-fly-l { 0%{transform:translateX(100%);opacity:0} 100%{transform:translateX(0);opacity:1} }
@keyframes ppt-fly-r { 0%{transform:translateX(-100%);opacity:0} 100%{transform:translateX(0);opacity:1} }
@keyframes ppt-fly-t { 0%{transform:translateY(100%);opacity:0} 100%{transform:translateY(0);opacity:1} }
@keyframes ppt-fly-b { 0%{transform:translateY(-100%);opacity:0} 100%{transform:translateY(0);opacity:1} }

/* zoom */
@keyframes ppt-zoom-in { 0%{transform:scale(0);opacity:0} 100%{transform:scale(1);opacity:1} }
@keyframes ppt-zoom-out { 0%{transform:scale(1);opacity:1} 100%{transform:scale(0);opacity:0} }

/* fade */
@keyframes ppt-fade-in { 0%{opacity:0} 100%{opacity:1} }
@keyframes ppt-fade-out { 0%{opacity:1} 100%{opacity:0} }

/* wipe */
@keyframes ppt-wipe-r { 0%{clip-path:inset(0 100% 0 0)} 100%{clip-path:inset(0 0 0 0)} }
@keyframes ppt-wipe-l { 0%{clip-path:inset(0 0 0 100%)} 100%{clip-path:inset(0 0 0 0)} }
@keyframes ppt-wipe-t { 0%{clip-path:inset(100% 0 0 0)} 100%{clip-path:inset(0 0 0 0)} }
@keyframes ppt-wipe-b { 0%{clip-path:inset(0 0 100% 0)} 100%{clip-path:inset(0 0 0 0)} }

/* pulse */
@keyframes ppt-pulse { 0%,100%{opacity:1} 50%{opacity:.3} }

/* box */
@keyframes ppt-box-in { 0%{clip-path:inset(50% 50%);opacity:0} 100%{clip-path:inset(0 0);opacity:1} }

/* swing bounce */
@keyframes ppt-bounce-in { 0%{transform:translateY(-100%);opacity:0} 60%{transform:translateY(10%);opacity:1} 80%{transform:translateY(-5%)} 100%{transform:translateY(0)} }

/* ═══════════════ 6. 点击光圈 ═══════════════ */
.ppt-click-ripple { position: absolute; pointer-events: none; border-radius: 50%; background: rgba(180,40,20,.5); animation: ppt-ripple .5s ease-out forwards; z-index: 9999; }
@keyframes ppt-ripple { 0% { width: 0; height: 0; opacity: 1; transform: translate(-50%,-50%); } 100% { width: 56px; height: 56px; opacity: 0; transform: translate(-50%,-50%); } }

/* ═══════════════ 7. 通用 ═══════════════ */
.hidden { display: none !important; }
.drag-active .ppt-upload-overlay { background: #1a1a2e; }
.drag-active .ppt-dropzone { border-color: #d24726; box-shadow: 0 0 30px rgba(210,71,38,.3); }