/* ===================================================
   PULSE CHAT v2.0 — Layout (SPA Pages, Sidebar, Chat)
   =================================================== */

/* ===== PAGE SYSTEM ===== */
.page { display: none; width: 100%; height: 100%; overflow: hidden; }
.page.active { display: flex; }

/* ===== APP GRID ===== */
#page-chat {
  flex-direction: row;
  max-width: 1680px;
  margin: 0 auto;
  width: 100%;
  height: 100vh;
  min-height: 0;
  position: relative;
  overflow: hidden;
  background: var(--bg-0);
}

/* ===== SEARCH ===== */
.search-divider { padding: 10px 16px; font-size: 12px; color: var(--accent); font-weight: 600; background: var(--bg-1); text-transform: uppercase; letter-spacing: 0.5px; }

/* ===== SIDEBAR ===== */
.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  max-width: 100vw;
  height: 100%;
  background: var(--bg-1);
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 10;
  border-right: 1px solid var(--divider);
  flex-shrink: 0;
  transition: background var(--transition);
}

.sidebar-header {
  height: var(--header-h);
  display: flex;
  align-items: center;
  padding: 0 var(--sidebar-header-pad-x);
  gap: var(--space-1);
  flex-shrink: 0;
}

.sidebar-title {
  flex: 1;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
  padding-left: var(--space-2);
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== CHAT LIST ===== */
.chat-list { flex: 1; overflow-y: auto; overflow-x: hidden; }

/* ===== SLIDE MENU (fixed with proper overlay) ===== */
.menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
  -webkit-backdrop-filter: blur(1px);
  backdrop-filter: blur(1px);
}
.menu-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.slide-menu {
  position: fixed;
  top: 0; left: 0;
  width: 300px;
  max-width: 80vw;
  height: 100%;
  background: var(--bg-1);
  z-index: 101;
  transform: translateX(-100%);
  transition: transform var(--transition-slow);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  box-shadow: 4px 0 24px rgba(0,0,0,0.3);
}
.slide-menu.active { transform: translateX(0); }

.menu-header {
  padding: 20px 20px 16px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--divider);
}
.menu-avatar-circle {
  width: 64px; height: 64px; border-radius: 50%;
  background: var(--gradient-accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; font-weight: 700; color: #fff; margin-bottom: 12px;
}
.menu-user-name { font-size: 17px; font-weight: 600; margin-bottom: 2px; }
.menu-user-phone { font-size: 14px; color: var(--text-2); }

.menu-items { padding: 8px 0; }
.menu-item {
  display: flex; align-items: center;
  padding: 12px 24px; gap: 20px;
  min-height: 48px;
  font-size: 15px; cursor: pointer;
  transition: background 0.12s;
  border-radius: 0;
}
.menu-item:hover { background: var(--bg-hover); }
.menu-item:active { background: var(--bg-ripple); }
.menu-item i { width: 24px; text-align: center; color: var(--menu-icon); font-size: 20px; }
.menu-item span { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.menu-divider { height: 1px; background: var(--divider); margin: 8px 0; }
.menu-theme-row { display: flex; align-items: center; padding: 12px 24px; gap: 20px; font-size: 15px; min-height: 48px; }
.menu-theme-row i { width: 24px; text-align: center; color: var(--menu-icon); font-size: 20px; }
.menu-theme-row span { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ===== CHAT VIEW ===== */
.chat-view {
  flex: 1; display: flex; flex-direction: column;
  background: var(--bg-0); min-width: 0; min-height: 0;
  position: relative;
  transition: background var(--transition);
}
/* Subtle dot pattern (TG-like wallpaper) */
.chat-view::before {
  content: ''; position: absolute; inset: 0; opacity: 0.015;
  background-image: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='20' cy='20' r='1' fill='%23888' fill-opacity='0.3'/%3E%3C/svg%3E");
  pointer-events: none; z-index: 0;
}

.chat-header {
  height: var(--header-h);
  background: var(--bg-1);
  display: flex; align-items: center;
  padding: 0 var(--chat-header-pad-x); gap: var(--space-2);
  flex-shrink: 0; z-index: 2;
  border-bottom: 1px solid var(--divider);
  transition: background var(--transition);
}
.back-btn { display: none; }
.chat-header-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  flex-shrink: 0; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  font-weight: 600; color: #fff;
}
.chat-header-info { flex: 1; min-width: 0; cursor: pointer; }
.chat-header-name { font-size: 15px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chat-header-status { font-size: var(--font-size); color: var(--text-2); }
.chat-header-status.online { color: var(--online); }
.chat-header-actions { display: flex; gap: 2px; }

/* Messages area */
.messages-area { flex: 1; overflow-y: auto; z-index: 1; position: relative; }
.messages-container {
  display: flex;
  flex-direction: column;
  padding: var(--messages-pad-y) var(--messages-pad-x);
  min-height: 100%;
  justify-content: flex-end;
}

/* Input area */
.input-area {
  display: flex;
  align-items: flex-end;
  padding: var(--space-1) var(--space-2);
  padding-bottom: calc(var(--space-1) + var(--safe-bottom));
  background: var(--bg-1);
  border-top: 1px solid var(--divider);
  gap: 0;
  z-index: 2;
  transition: background var(--transition);
  flex-shrink: 0;
  position: relative;
}
.input-wrapper { flex: 1; min-width: 0; }
.input-wrapper textarea {
  width: 100%; max-height: 150px;
  min-height: var(--control-h);
  padding: 10px var(--space-2);
  resize: none;
  font-size: var(--font-size); line-height: 1.35;
  color: var(--text-0); overflow-y: auto;
  border-radius: var(--radius-input);
  transition: border-color var(--dur-150) var(--easing-standard), box-shadow var(--dur-150) var(--easing-standard), background-color var(--dur-150) var(--easing-standard);
}
.input-wrapper textarea::placeholder { color: var(--text-2); }
.input-wrapper textarea:focus-visible { box-shadow: var(--focus-ring); }

/* Reply preview */
.reply-preview {
  display: flex; align-items: center;
  padding: 8px 12px; background: var(--bg-1);
  border-top: 1px solid var(--divider);
  gap: 8px; z-index: 2;
}
.reply-preview-bar { width: 2px; height: 32px; background: var(--accent); border-radius: 1px; flex-shrink: 0; }
.reply-preview-content { flex: 1; min-width: 0; }
.reply-preview-name { font-size: 13px; font-weight: 600; color: var(--accent); }
.reply-preview-text { font-size: 13px; color: var(--text-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.reply-close { width: 32px; height: 32px; border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--text-2); }
.reply-close:hover { background: var(--bg-hover); }

/* ===== MOBILE ===== */
@media (max-width: 768px) {
  .sidebar { width: 100%; position: absolute; top: 0; left: 0; z-index: 10; }
  .chat-view {
    position: absolute; inset: 0; z-index: 20;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
    will-change: transform;
  }
  .chat-view.active { transform: translateX(0); }
  .back-btn { display: flex; }
  .sidebar-title { font-size: 18px; }
  .sidebar-header { padding: 0 4px; }
  .chat-header { padding: 0 var(--space-1); gap: 6px; }
  .chat-header-avatar { width: 36px; height: 36px; }
  .chat-header-name { font-size: 14px; }
  .chat-header-status { font-size: 12px; }
  .input-area { padding: 6px 6px; padding-bottom: calc(6px + var(--safe-bottom)); }
  .input-wrapper textarea { min-height: 42px; padding: 8px 10px; }
}

@media (max-width: 1024px) {
  .slide-menu { width: min(340px, 86vw); }
}

@media (max-width: 380px) {
  .sidebar-title { font-size: 16px; }
  .chat-header-actions .icon-btn { width: 34px; height: 34px; }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .sidebar { width: 300px; }
}

@media (min-width: 1400px) {
  .messages-container { max-width: 900px; margin: 0 auto; }
}

/* ===== Liquid glass pass (subtle, non-structural) ===== */
.chat-view::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(60% 40% at 20% 10%, rgba(106,178,242,0.09), transparent 70%),
    radial-gradient(45% 35% at 85% 85%, rgba(166,149,231,0.08), transparent 70%);
}