/* ===== footer.css ===== */
/* Tách từ footer.html để trình duyệt cache riêng, không phải tải lại mỗi lần render trang (giảm HTML payload, tận dụng HTTP cache) */

/* --- Khối 1: Card lật ảnh (profile picture stack) --- */
button {
  cursor: pointer;
}

:root {
  --pv1d: 0.3;
  --pv11: 1;
  --pv10: 410ms;
  --pvn: cubic-bezier(0.31, 1.84, 0.64, 1);
  --pvo: 610ms;
  --pvh: cubic-bezier(0.22, 1, 0.36, 1);
  --pv-card-bg: #181818;
  --pro-surface-shadow: 0 0 0 1px rgba(0, 0, 0, 0.06), 0 2px 6px rgba(0, 0, 0, 0.05), 0 4px 42px rgba(0, 0, 0, 0.06);
}
.pv1r {
    position: relative;
    width: 85%;
    aspect-ratio: 1;
    flex-shrink: 0;
}
.pv24 {
    appearance: none;
    border: 0;
    padding: 0;
    position: absolute;
    top: 0;
    left: 0;
    width: 90%;
    aspect-ratio: 1;
    border-radius: 12px;
    background: var(--pv-card-bg, #fff);
    box-shadow: var(--pro-surface-shadow);
    overflow: hidden;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    translate: var(--cx) var(--cy);
    rotate: var(--rot);
    scale: 1;
    opacity: var(--card-op, 1);
    transition: translate var(--pvm) var(--pvg), rotate var(--pvm) var(--pvg), scale var(--pvo) var(--pvh), opacity var(--pvm) var(--pvg);
    will-change: translate, rotate, scale, opacity;
}
.pv24 img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    pointer-events: none;
}
@media (hover: hover) {
    .pv1r:hover .pv24 {
        translate: calc(var(--cx) + var(--dx) * var(--pv1d)) calc(var(--cy) + var(--dy));
        rotate: calc(var(--rot) + var(--drot) * var(--pv11));
        opacity: 1;
        transition: translate var(--pv10) var(--pvn), rotate var(--pv10) var(--pvn), scale var(--pvo) var(--pvh), opacity var(--pv10) var(--pvn);
    }
}
@media (hover: hover) {
    .pv24:hover {
        scale: var(--pv1q);
        z-index: 30;
    }
}

/* --- Khối 2: Prompt input (ô nhập chat) --- */
  :root{
    --background: 0 0% 100%;
    --foreground: 240 10% 12%;
    --card: 0 0% 100%;
    --muted: 240 5% 96%;
    --muted-foreground: 240 4% 46%;
    --border: 240 6% 90%;
    --accent: 240 5% 94%;
    --primary: 240 6% 10%;
    --primary-foreground: 0 0% 100%;
    --ring: 240 6% 10%;
  }
  .bg-background{ background-color: hsl(var(--background)); }
  .bg-card{ background-color: hsl(var(--card)); }
  .bg-card\/95{ background-color: hsl(var(--card) / 0.95); }
  .bg-card\/90{ background-color: hsl(var(--card) / 0.9); }
  .bg-muted{ background-color: hsl(var(--muted)); }
  .bg-accent{ background-color: hsl(var(--accent)); }
  .bg-accent\/60{ background-color: hsl(var(--accent) / 0.6); }
  .bg-primary{ background-color: hsl(var(--primary)); }
  .text-foreground{ color: hsl(var(--foreground)); }
  .text-foreground\/50{ color: hsl(var(--foreground) / 0.5); }
  .text-foreground\/70{ color: hsl(var(--foreground) / 0.7); }
  .text-foreground\/80{ color: hsl(var(--foreground) / 0.8); }
  .text-foreground\/85{ color: hsl(var(--foreground) / 0.85); }
  .text-muted-foreground{ color: hsl(var(--muted-foreground)); }
  .text-muted-foreground\/80{ color: hsl(var(--muted-foreground) / 0.8); }
  .text-primary-foreground{ color: hsl(var(--primary-foreground)); }
  .border-border{ border-color: hsl(var(--border)); }
  .from-card{ --tw-gradient-from: hsl(var(--card)); }
  .via-card\/90{ --tw-gradient-via: hsl(var(--card) / 0.9); }

.via-card\/90 {
    --tw-gradient-via-stops: var(--tw-gradient-position), var(--tw-gradient-from) var(--tw-gradient-from-position), var(--tw-gradient-via) var(--tw-gradient-via-position), var(--tw-gradient-to) var(--tw-gradient-to-position);
    --tw-gradient-stops: var(--tw-gradient-via-stops);
}
.bg-gradient-to-b {
    --tw-gradient-position: to bottom in oklab;
    background-image: linear-gradient(var(--tw-gradient-stops));
}
.bg-gradient-to-t {
    --tw-gradient-position: to top in oklab;
    background-image: linear-gradient(var(--tw-gradient-stops));
}

  .ease-spring{ transition-timing-function: cubic-bezier(0.175, 0.885, 0.32, 1.275); }
  .ease-spring-strong{ transition-timing-function: cubic-bezier(0.34, 1.56, 0.64, 1); }

  .prompt-scrollbar::-webkit-scrollbar{ width:4px; height:4px; background:transparent; }
  .prompt-scrollbar::-webkit-scrollbar-track{ background:transparent; }
  .prompt-scrollbar::-webkit-scrollbar-thumb{ background:transparent; border-radius:4px; }
  .prompt-scrollbar:hover::-webkit-scrollbar-thumb{ background: hsl(var(--muted-foreground) / 0.3); }

  @keyframes fadeInZoom{
    from{ opacity:0; transform: scale(0.95); }
    to{ opacity:1; transform: scale(1); }
  }
  .morph-anim{ animation: fadeInZoom 0.3s cubic-bezier(0.175,0.885,0.32,1.275); }

  @keyframes thumbIn{
    from{ opacity:0; transform: translateY(-10px) scale(0.9); }
    to{ opacity:1; transform: translateY(0) scale(1); }
  }
  .thumb-anim{ animation: thumbIn 0.4s cubic-bezier(0.175,0.885,0.32,1.275) backwards; }

  @keyframes instanceIn{
    from{ opacity:0; transform: translateY(8px) scale(0.98); }
    to{ opacity:1; transform: translateY(0) scale(1); }
  }
  .instance-in{ animation: instanceIn 0.35s cubic-bezier(0.175,0.885,0.32,1.275); }

/* --- Khối 3: Bổ sung (reaction, menu...) --- */
/* Base Overlay Bubble List */
.msg-overlay-list-bubble {
  height: calc(100vh - 100px);
  width: 420px;
  box-shadow: 0 0 0 1px rgba(140, 140, 140, 0.2), 0 4px 4px rgba(0, 0, 0, 0.3) !important;
  
  /* Ép trình duyệt tạo Compositor Layer riêng (Hardware Acceleration) */
  will-change: transform, opacity;
  transform: translate3d(0, 0, 0);
  
  animation: fade-in 167ms cubic-bezier(0.4, 0, 1, 1);
  transition: transform 167ms cubic-bezier(0, 0, 0.2, 1);
}

.msg-overlay-list-bubble--is-minimized {
  /* Loại bỏ lệnh trùng lặp, dùng translate3d để bật 3D Context cho GPU */
  transform: translate3d(0, 100%, 0) !important;
  /* Lưu ý: Nếu muốn thu nhỏ chiều rộng, nên animate scaleX thay vì width để không trigger Layout reflow */
  width: 80px !important;
  flex: 0 0 80px !important;
}

/* Conversation Bubble */
.msg-overlay-conversation-bubble {
  height: 600px;
  width: 400px;
  transform: translate3d(0, 0, 0);
}

.msg-overlay-conversation-bubble.msg-overlay-conversation-bubble--is-minimized {
  display: none;
}



/* Responsive breakpoint */
@media (max-width: 1200px) {
  .msg-overlay-list-bubble {
    width: 100% !important;
    height: calc(100dvh);
    min-width: auto !important;
    position: absolute !important;
  }
  
  .msg-overlay-list-bubble--is-minimized {
    /* Dùng display: none thay vì visibility để gỡ hoàn toàn khỏi Render Tree khi ẩn */
    display: none !important;
  }
  
	.msg-overlay-conversation-bubble {
		width: 100%;
		height: calc(100dvh);
	}
}

.msg-overlay-conversation-bubble [data-post-id] {
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
}

#mobile-message-menu-panel {
  animation: mobile-menu-in 167ms cubic-bezier(0, 0, 0.2, 1);
}
@keyframes mobile-menu-in {
  from { transform: translateY(16px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}


.messages_content > * {
  content-visibility: auto;
  contain-intrinsic-size: 0 60px; /* chiều cao ước lượng 1 tin nhắn, tránh nhảy scrollbar */
}
.messages_content > *[data-post-id] { contain-intrinsic-size: 0 90px; }
.messages_content > *:has(.location-msg-thumb),
.messages_content > *:has([data-media-type="image"]),
.messages_content > *:has([data-media-type="video"]) {
  contain-intrinsic-size: 0 200px;
}

.msg-s-message-list {
  contain: content; /* cô lập layout/paint của khung chat, không ảnh hưởng phần còn lại của trang */
  -webkit-overflow-scrolling: touch;   /* bật momentum scroll trên iOS */
  overscroll-behavior: contain;        /* chặn scroll chaining/rubber-band lan ra ngoài */
  touch-action: pan-y;                 /* tránh xung đột gesture với long-press detector */
}

#usersList {
  contain: content;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}