:root {
  --bg-base: #0d0d0f;
  --bg-surface: #141417;
  --bg-elevated: #1a1a1f;
  --bg-hover: #202027;
  --border: #2a2a35;
  --border-subtle: #1e1e26;
  --accent: #a855f7;
  --accent-dim: #7c3aed;
  --accent-glow: rgba(168, 85, 247, 0.18);
  --accent-soft: rgba(168, 85, 247, 0.08);
  --text-primary: #f0f0f4;
  --text-secondary: #9898a8;
  --text-muted: #5a5a6e;
  --msg-user-bg: #a855f7;
  --msg-user-text: #fff;
  --msg-support-bg: #1e1e27;
  --msg-support-text: #e8e8f0;
  --green: #22c55e;
  --red: #ef4444;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --font: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --shadow-card: 0 24px 64px rgba(0,0,0,0.5), 0 0 0 1px var(--border);
  --shadow-msg: 0 2px 8px rgba(0,0,0,0.25);
}

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

html, body {
  height: 100%;
  font-family: var(--font);
  background: var(--bg-base);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
  -webkit-text-size-adjust: 100%;
}

/* ---- LANDING ---- */
.landing-screen {
  height: 100vh;
  height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-base);
  background-image:
    radial-gradient(ellipse 60% 50% at 50% -10%, rgba(168,85,247,0.12) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 80% 90%, rgba(124,58,237,0.07) 0%, transparent 60%);
}

.landing-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 48px 44px 44px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.logo-wrap {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  overflow: hidden;
  border: 1.5px solid var(--border);
  background: #000;
  margin-bottom: 8px;
}

.logo {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.brand-title {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.brand-sub {
  font-size: 0.88rem;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 28px;
}

.start-form {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.input-group label {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.input-group input {
  background: var(--bg-elevated);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  padding: 13px 16px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  font-family: var(--font);
}

.input-group input::placeholder { color: var(--text-muted); }

.input-group input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.btn-start {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 13px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
  font-family: var(--font);
  letter-spacing: -0.01em;
  margin-top: 4px;
  box-shadow: 0 4px 16px rgba(168,85,247,0.3);
}

.btn-start:hover {
  background: var(--accent-dim);
  box-shadow: 0 6px 24px rgba(168,85,247,0.4);
  transform: translateY(-1px);
}

.btn-start:active { transform: translateY(0); }

.landing-links {
  display: flex;
  gap: 10px;
  width: 100%;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--border-subtle);
}
.landing-link {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 600;
  transition: background 0.18s, border-color 0.18s, color 0.18s, transform 0.1s;
}
.landing-link svg { flex-shrink: 0; }
.landing-link:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
  color: var(--text-primary);
  transform: translateY(-1px);
}
.landing-link.discord:hover {
  color: #fff;
  border-color: #5865f2;
  background: rgba(88, 101, 242, 0.16);
}
.landing-link.discord:hover svg { color: #5865f2; }

@media (max-width: 420px) {
  .landing-links { flex-direction: column; }
}

/* ---- CHAT APP ---- */
.chat-app {
  display: flex;
  height: 100vh;
  height: 100dvh;
  width: 100vw;
  background: var(--bg-base);
  overflow: hidden;
}

.hidden { display: none !important; }

/* SIDEBAR */
.chat-sidebar {
  width: 300px;
  min-width: 300px;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  padding: 0;
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 22px 20px 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.sidebar-logo {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: #000;
  border: 1px solid var(--border);
  object-fit: contain;
}

.sidebar-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-brand {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--green);
}

.status-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 6px var(--green);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.session-info {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px;
  margin: 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.agent-avatar {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.agent-name {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.agent-status {
  font-size: 0.76rem;
  color: var(--text-muted);
}

.sidebar-footer {
  margin-top: auto;
  padding: 16px;
  border-top: 1px solid var(--border-subtle);
}

.sidebar-links {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
.sidebar-link {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 9px 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 600;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.sidebar-link svg { flex-shrink: 0; }
.sidebar-link:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
  color: var(--text-primary);
}
.sidebar-link.discord:hover {
  color: #fff;
  border-color: #5865f2;
  background: rgba(88, 101, 242, 0.16);
}
.sidebar-link.discord:hover svg { color: #5865f2; }

.btn-end {
  width: 100%;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  padding: 10px;
  font-size: 0.84rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font);
}

.btn-end:hover {
  border-color: var(--red);
  color: var(--red);
  background: rgba(239,68,68,0.07);
}

/* CHAT MAIN */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--bg-base);
}

.chat-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.agent-avatar-sm {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.84rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.topbar-name {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.topbar-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.secure-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 5px 12px;
}

/* MESSAGES */
.chat-messages {
  flex: 1 1 0;
  min-height: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  padding: 28px 32px 12px;
  display: flex;
  flex-direction: column;
  gap: 0;
  scroll-behavior: smooth;
}

.chat-messages::-webkit-scrollbar { width: 4px; }
.chat-messages::-webkit-scrollbar-track { background: transparent; }
.chat-messages::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.msg-date-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 8px 0 16px;
}

.msg-date-divider::before,
.msg-date-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-subtle);
}

.msg-date-divider span {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.msg-row {
  display: flex;
  flex-direction: column;
  max-width: min(72%, 720px);
  gap: 4px;
  margin-bottom: 14px;
  animation: msgIn 0.22s ease;
}

.msg-row.grouped {
  margin-top: -10px;
}

@keyframes msgIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.msg-row.user-row {
  align-self: flex-end;
  align-items: flex-end;
}

.msg-row.support-row {
  align-self: flex-start;
  align-items: flex-start;
}

.msg-sender {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 2px;
  padding: 0 6px;
}

.msg-bubble {
  padding: 12px 17px;
  border-radius: var(--radius-md);
  font-size: 0.98rem;
  line-height: 1.55;
  word-break: break-word;
  box-shadow: var(--shadow-msg);
  max-width: 100%;
  white-space: pre-wrap;
}

.msg-row.user-row .msg-bubble {
  background: var(--msg-user-bg);
  color: var(--msg-user-text);
  border-bottom-right-radius: 4px;
}

.msg-row.support-row .msg-bubble {
  background: var(--msg-support-bg);
  color: var(--msg-support-text);
  border-bottom-left-radius: 4px;
  border: 1px solid var(--border-subtle);
}

.msg-time {
  font-size: 0.72rem;
  color: var(--text-muted);
  padding: 0 6px;
  opacity: 0.75;
}

/* System messages */
.msg-system {
  align-self: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 0.76rem;
  color: var(--text-muted);
  margin: 6px 0;
  animation: msgIn 0.22s ease;
}

/* INPUT */
.chat-input-area {
  flex-shrink: 0;
  padding: 18px 32px 22px;
  padding-bottom: calc(22px + env(safe-area-inset-bottom, 0px));
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
}

.message-form { width: 100%; }

.input-row {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: var(--bg-elevated);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  padding: 10px 10px 10px 12px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.btn-attach {
  width: 38px;
  height: 38px;
  min-width: 38px;
  border-radius: var(--radius-md);
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.18s, color 0.18s;
}
.btn-attach:hover:not(:disabled) {
  background: var(--bg-surface);
  color: var(--accent);
}
.btn-attach:disabled { opacity: 0.4; cursor: not-allowed; }

.msg-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  max-width: 360px;
  display: flex;
}
.msg-media a.msg-media-link { display: block; line-height: 0; }
.msg-media-image,
.msg-media-video {
  display: block;
  max-width: 360px;
  max-height: 320px;
  width: auto;
  height: auto;
  object-fit: contain;
  background: #000;
}
.msg-media-file {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  color: var(--text-primary);
  text-decoration: none;
  font-size: 0.88rem;
  min-width: 220px;
  max-width: 360px;
  transition: background 0.15s, border-color 0.15s;
}
.msg-media-file:hover { background: var(--bg-hover); }
.msg-media-file .file-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  flex-shrink: 0;
}
.msg-media-file .file-meta {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.msg-media-file .file-name {
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.msg-media-file .file-sub {
  font-size: 0.76rem;
  color: var(--text-muted);
}

.msg-media-audio-wrap {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px 12px;
}
.msg-media-audio {
  width: 280px;
  max-width: 100%;
  display: block;
}
.msg-media-caption {
  font-size: 0.76rem;
  color: var(--text-muted);
}
.msg-row.user-row .msg-media { align-self: flex-end; }
.msg-row.support-row .msg-media { align-self: flex-start; }

.input-row:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

textarea#messageInput {
  flex: 1;
  min-width: 0;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 16px;
  font-family: var(--font);
  resize: none;
  max-height: 120px;
  overflow-y: auto;
  line-height: 1.5;
  padding: 4px 2px;
}

textarea#messageInput::placeholder { color: var(--text-muted); }

textarea#messageInput::-webkit-scrollbar { width: 3px; }
textarea#messageInput::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.btn-send {
  width: 38px;
  height: 38px;
  min-width: 38px;
  border-radius: 10px;
  background: var(--accent);
  border: none;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, opacity 0.2s;
}

.btn-send:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-send:not(:disabled):hover {
  background: var(--accent-dim);
  transform: scale(1.06);
}

/* MODAL */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(4px);
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal-box {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  max-width: 360px;
  width: 90%;
  text-align: center;
  box-shadow: 0 32px 80px rgba(0,0,0,0.6);
  animation: slideUp 0.25s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.modal-box h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.modal-box p {
  font-size: 0.86rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.5;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.btn-modal-cancel {
  flex: 1;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  padding: 11px;
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font);
}

.btn-modal-cancel:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-modal-confirm {
  flex: 1;
  background: var(--red);
  border: none;
  color: #fff;
  border-radius: var(--radius-sm);
  padding: 11px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font);
}

.btn-modal-confirm:hover {
  background: #dc2626;
}

/* CONNECTING OVERLAY */
.connecting-overlay {
  position: fixed;
  inset: 0;
  background: rgba(13,13,15,0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  backdrop-filter: blur(6px);
}

.connecting-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* SIDEBAR HISTORY */
.sidebar-toggle, .sidebar-show {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s;
}
.sidebar-toggle:hover, .sidebar-show:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}
.sidebar-toggle { margin-left: auto; }
.sidebar-show { display: none; margin-right: 8px; }

.btn-new-chat {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 12px 16px 8px;
  padding: 10px 14px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  transition: background 0.18s, transform 0.1s;
}
.btn-new-chat:hover { background: var(--accent-hover, var(--accent)); filter: brightness(1.08); }
.btn-new-chat:active { transform: scale(0.98); }

.sidebar-section-label {
  padding: 14px 18px 6px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.session-list {
  flex: 1;
  overflow-y: auto;
  padding: 0 8px 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.session-list::-webkit-scrollbar { width: 4px; }
.session-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.session-empty {
  padding: 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
  text-align: center;
}

.session-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  color: var(--text-primary);
  transition: background 0.15s, border-color 0.15s;
}
.session-item:hover {
  background: var(--bg-elevated);
  border-color: var(--border-subtle);
}
.session-item.active {
  background: var(--bg-elevated);
  border-color: var(--accent);
}
.session-item.closed { opacity: 0.78; }

.session-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-top: 6px;
  flex-shrink: 0;
}
.session-dot.live { background: #22c55e; box-shadow: 0 0 0 3px rgba(34,197,94,0.18); }
.session-dot.off { background: var(--border); }

.session-item-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.session-item-title {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.session-item-preview {
  font-size: 0.76rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.session-item-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 2px;
}
.session-item.active .session-status { color: var(--accent); }

.user-pill {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
}
.user-pill-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.92rem;
}
.user-pill-name {
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-end-top {
  background: transparent;
  color: #ef4444;
  border: 1px solid rgba(239,68,68,0.4);
  padding: 6px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 600;
  transition: background 0.15s, border-color 0.15s;
}
.btn-end-top:hover { background: rgba(239,68,68,0.12); border-color: #ef4444; }

/* REOPEN BANNER */
.reopen-banner {
  margin: 16px 24px 0;
  padding: 16px 20px;
  background: linear-gradient(135deg, var(--bg-elevated), var(--bg-surface));
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.reopen-text { flex: 1; min-width: 200px; display: flex; flex-direction: column; gap: 4px; }
.reopen-text strong { font-size: 0.95rem; color: var(--text-primary); }
.reopen-text span { font-size: 0.83rem; color: var(--text-muted); }

.btn-reopen {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.18s, transform 0.1s;
  box-shadow: 0 4px 14px var(--accent-soft);
}
.btn-reopen:hover { filter: brightness(1.1); }
.btn-reopen:active { transform: scale(0.98); }

/* EMPTY STATE */
.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  text-align: center;
  gap: 12px;
}
.empty-logo { width: 56px; height: 56px; border-radius: 14px; opacity: 0.85; }
.empty-state h3 { font-size: 1.15rem; color: var(--text-primary); margin: 4px 0 0; }
.empty-state p { font-size: 0.92rem; color: var(--text-muted); margin: 0 0 14px; }
.empty-state .btn-start { width: auto; padding: 10px 20px; }

.hidden { display: none !important; }

/* SIDEBAR COLLAPSED (desktop) */
.chat-app.sidebar-collapsed .chat-sidebar { display: none; }
.chat-app.sidebar-collapsed .sidebar-show { display: flex; }

/* MOBILE BACKDROP (covers main area when sidebar is open on mobile) */
.sidebar-backdrop { display: none; }

/* RESPONSIVE
   - <=1024px (covers iPad portrait): sidebar becomes overlay, chat takes full width
   - <=640px (phones): tighter paddings and full-width media
   - >=1400px (large desktop): cap message column width for readability
*/
@media (max-width: 1024px) {
  .chat-sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 40;
    width: 84vw;
    max-width: 320px;
    box-shadow: 4px 0 24px rgba(0,0,0,0.4);
    transform: translateX(0);
    transition: transform 0.22s ease;
  }
  .chat-app.sidebar-collapsed .chat-sidebar {
    display: flex;
    transform: translateX(-100%);
  }
  .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: 35;
    opacity: 1;
    transition: opacity 0.18s ease;
  }
  .chat-app.sidebar-collapsed .sidebar-backdrop {
    opacity: 0;
    pointer-events: none;
  }
  .sidebar-show { display: flex; }
  .sidebar-toggle { display: flex; }
  .chat-main { width: 100%; min-width: 0; }
  .msg-row { max-width: min(78%, 620px); }
}

@media (max-width: 640px) {
  .chat-messages { padding: 14px 12px 4px; }
  .chat-input-area {
    padding: 10px 12px 14px;
    padding-bottom: calc(14px + env(safe-area-inset-bottom, 0px));
  }
  .chat-topbar { padding: 10px 14px; }
  .input-row { padding: 8px 8px 8px 10px; gap: 6px; }
  .btn-attach, .btn-send { width: 36px; height: 36px; min-width: 36px; }
  .msg-row { max-width: 90%; }
  .msg-bubble { font-size: 0.94rem; padding: 10px 14px; }
  .msg-media, .msg-media-image, .msg-media-video,
  .msg-media-file { max-width: 100%; }
  .msg-media-audio { width: 100%; }
  .msg-media-audio-wrap { padding: 8px 10px; }
  .reopen-banner { margin: 12px 12px 0; padding: 12px 14px; gap: 10px; }
  .btn-reopen { padding: 10px 16px; font-size: 0.88rem; width: 100%; justify-content: center; }
  .empty-state { padding: 24px 16px; }
}

@media (max-width: 380px) {
  .chat-topbar .agent-avatar-sm { display: none; }
  .topbar-name { font-size: 0.88rem; }
  .topbar-sub { font-size: 0.72rem; }
}

@media (min-width: 1400px) {
  .chat-messages,
  .chat-input-area .message-form,
  .reopen-banner {
    max-width: 1100px;
    margin-left: auto;
    margin-right: auto;
  }
  .msg-row { max-width: min(70%, 760px); }
}