/* ============================================================
   Chat Screen — Styles (dark, premium, mobile-first)
   ============================================================ */

.chat {
  display: flex;
  flex-direction: column;
  height: 100%;
  width: 100%;
  background-color: var(--surface-0);
}

/* --- Header --- */
.chat-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  padding-top: calc(var(--safe-area-top) + var(--space-md));
  background-color: var(--surface-1);
  border-bottom: 1px solid var(--surface-3);
  flex-shrink: 0;
}

.chat-lock-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background-color: var(--surface-3);
}
.chat-lock-btn svg { width: 18px; height: 18px; fill: var(--text-secondary); }
.chat-lock-btn:active { transform: scale(0.92); }

.chat-header-info { display: flex; flex-direction: column; gap: 2px; }
.chat-partner-name {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
}
.chat-presence { display: flex; align-items: center; gap: 6px; }
.chat-presence-dot {
  width: 8px; height: 8px; border-radius: var(--radius-full);
  background-color: var(--status-offline);
  transition: background-color var(--transition-normal);
}
.chat-presence-dot.online { background-color: var(--status-online); box-shadow: 0 0 6px var(--status-online); }
.chat-presence-text { font-size: var(--font-size-xs); color: var(--text-tertiary); }

/* --- Banner --- */
.chat-banner {
  padding: var(--space-sm) var(--space-md);
  background-color: var(--surface-2);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  text-align: center;
  flex-shrink: 0;
}

/* --- Messages --- */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  -webkit-overflow-scrolling: touch;
}

.chat-empty {
  margin: auto;
  text-align: center;
  color: var(--text-tertiary);
  font-size: var(--font-size-sm);
}
.chat-empty-sub { margin-top: var(--space-xs); font-size: var(--font-size-md); }

.msg-row { display: flex; max-width: 100%; animation: msg-in var(--transition-normal) ease; }
.msg-row.mine { justify-content: flex-end; }
.msg-row.theirs { justify-content: flex-start; }

.msg-bubble {
  max-width: 78%;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-lg);
  word-wrap: break-word;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}
.msg-row.mine .msg-bubble {
  background: linear-gradient(135deg, var(--accent-info), #0066cc);
  color: #fff;
  border-bottom-right-radius: var(--radius-sm);
}
.msg-row.theirs .msg-bubble {
  background-color: var(--surface-3);
  color: var(--text-primary);
  border-bottom-left-radius: var(--radius-sm);
}

.msg-text { font-size: var(--font-size-md); line-height: var(--line-height-normal); }

.msg-meta {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
  margin-top: 2px;
}
.msg-time { font-size: 10px; opacity: 0.7; }
.msg-tick { font-size: 11px; opacity: 0.8; }
.msg-tick.read { color: #8fd0ff; opacity: 1; }
.msg-tick.failed { color: var(--accent-danger); opacity: 1; }

/* --- Typing indicator --- */
.chat-typing {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 var(--space-md) var(--space-sm);
}
.chat-typing .dot {
  width: 7px; height: 7px; border-radius: var(--radius-full);
  background-color: var(--text-tertiary);
  animation: typing-bounce 1.2s infinite ease-in-out;
}
.chat-typing .dot:nth-child(2) { animation-delay: 0.15s; }
.chat-typing .dot:nth-child(3) { animation-delay: 0.3s; }

/* --- Input bar --- */
.chat-input-bar {
  display: flex;
  align-items: flex-end;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  padding-bottom: calc(var(--safe-area-bottom) + var(--space-sm));
  background-color: var(--surface-1);
  border-top: 1px solid var(--surface-3);
  flex-shrink: 0;
}

.chat-action, .chat-send-btn {
  width: 40px; height: 40px;
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-full);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}
.chat-action svg { width: 22px; height: 22px; fill: var(--text-secondary); }
.chat-action:disabled { opacity: 0.35; }
.chat-send-btn { background: linear-gradient(135deg, var(--accent-info), #0066cc); }
.chat-send-btn svg { width: 20px; height: 20px; fill: #fff; }
.chat-send-btn:active:not(:disabled) { transform: scale(0.9); }
.chat-send-btn:disabled { opacity: 0.4; }

.chat-input {
  flex: 1;
  resize: none;
  max-height: 120px;
  padding: var(--space-sm) var(--space-md);
  background-color: var(--surface-3);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-md);
  color: var(--text-primary);
  line-height: var(--line-height-normal);
}
.chat-input::placeholder { color: var(--text-tertiary); }
.chat-input:disabled { opacity: 0.5; }

/* --- Media bubbles --- */
.msg-bubble.media { padding: 4px; }
.msg-image {
  display: block;
  max-width: 240px;
  max-height: 320px;
  border-radius: var(--radius-md);
  cursor: pointer;
  background-color: var(--surface-4);
}
.msg-media-loading {
  width: 200px; height: 140px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-tertiary); font-size: var(--font-size-sm);
  background-color: var(--surface-4); border-radius: var(--radius-md);
}
.msg-voice { display: flex; align-items: center; gap: var(--space-sm); padding: var(--space-xs) var(--space-sm); min-width: 200px; }
.msg-voice audio { width: 200px; height: 36px; }
.msg-voice-dur { font-size: var(--font-size-xs); opacity: 0.8; }

/* emoji-only messages render larger */
.msg-text.jumbo { font-size: 2.6rem; line-height: 1.1; }

/* --- Lightbox --- */
.lightbox {
  position: absolute;
  inset: 0;
  z-index: var(--z-modal);
  background-color: rgba(0, 0, 0, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
}
.lightbox-img { max-width: 96%; max-height: 90%; border-radius: var(--radius-sm); }
.lightbox-close {
  position: absolute; top: calc(var(--safe-area-top) + var(--space-md)); right: var(--space-lg);
  width: 40px; height: 40px; border-radius: var(--radius-full);
  background-color: rgba(255,255,255,0.15); color: #fff; font-size: 20px;
}

/* --- Recording overlay --- */
.rec-overlay {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  padding-bottom: calc(var(--safe-area-bottom) + var(--space-sm));
  background-color: var(--surface-2);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}
.rec-dot { width: 12px; height: 12px; border-radius: var(--radius-full); background-color: var(--accent-danger); animation: rec-pulse 1s infinite; }
.rec-timer { font-variant-numeric: tabular-nums; color: var(--text-primary); }
.rec-hint { font-size: var(--font-size-xs); color: var(--text-tertiary); margin-left: auto; }

@keyframes rec-pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.3; } }

/* --- Animations --- */
@keyframes msg-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes typing-bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.5; }
  30% { transform: translateY(-5px); opacity: 1; }
}