:root {
  --tg-bg: #0e1621;
  --tg-panel: #17212b;
  --tg-chat-bg: #0e1621;
  --tg-border: #242f3d;
  --tg-text: #e4e4e4;
  --tg-text-muted: #6d7a89;
  --tg-accent: #5288c1;
  --tg-accent-hover: #6b9bd1;
  --tg-out-msg: #2b5278;
  --tg-in-msg: #182533;
  --tg-input-bg: #242f3d;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

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

body {
  font-family: var(--font);
  background: var(--tg-bg);
  color: var(--tg-text);
  height: 100vh;
  overflow: hidden;
}

.hidden {
  display: none !important;
}

#app {
  height: 100%;
}

/* ——— Login ——— */
#login-screen {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0e1621 0%, #17212b 100%);
}

.login-box {
  background: var(--tg-panel);
  border: 1px solid var(--tg-border);
  border-radius: 12px;
  padding: 2rem;
  width: 320px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

.login-box h1 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  text-align: center;
  color: var(--tg-text);
}

#login-form input {
  display: block;
  width: 100%;
  padding: 12px 14px;
  margin-bottom: 12px;
  border: 1px solid var(--tg-border);
  border-radius: 8px;
  background: var(--tg-input-bg);
  color: var(--tg-text);
  font-size: 1rem;
}

#login-form input::placeholder {
  color: var(--tg-text-muted);
}

#login-form button {
  width: 100%;
  padding: 12px;
  margin-top: 8px;
  border: none;
  border-radius: 8px;
  background: var(--tg-accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

#login-form button:hover {
  background: var(--tg-accent-hover);
}

.error {
  color: #e06c75;
  font-size: 0.9rem;
  margin-top: 10px;
  min-height: 1.2em;
}

/* ——— Main layout (Telegram style) ——— */
#main-screen {
  height: 100%;
  display: flex;
  flex-direction: row;
}

.sidebar {
  width: 360px;
  min-width: 280px;
  max-width: 420px;
  background: var(--tg-panel);
  border-right: 1px solid var(--tg-border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--tg-border);
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 56px;
}

.user-name {
  flex: 1;
  font-weight: 600;
  font-size: 1rem;
}

.btn-icon {
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--tg-text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-icon:hover {
  background: var(--tg-border);
  color: var(--tg-text);
}

.admin-only.hidden {
  display: none !important;
}

.admin-only:not(.hidden) {
  display: flex !important;
}

.search-wrap {
  padding: 8px;
  border-bottom: 1px solid var(--tg-border);
  display: flex;
  gap: 8px;
  align-items: center;
}

#contact-search {
  flex: 1;
  min-width: 0;
  padding: 10px 14px;
  border: none;
  border-radius: 8px;
  background: var(--tg-input-bg);
  color: var(--tg-text);
  font-size: 0.95rem;
}

#contact-search::placeholder {
  color: var(--tg-text-muted);
}

.btn-new-chat {
  flex-shrink: 0;
  padding: 8px 14px;
  border: 1px solid var(--tg-accent);
  border-radius: 8px;
  background: transparent;
  color: var(--tg-accent);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
}

.btn-new-chat:hover {
  background: var(--tg-accent);
  color: #fff;
}

.contact-list {
  list-style: none;
  overflow-y: auto;
  flex: 1;
}

.contact-list li {
  padding: 12px 16px;
  border-bottom: 1px solid var(--tg-border);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: background 0.15s;
}

.contact-list li:hover {
  background: rgba(255,255,255,0.05);
}

.contact-list li.active {
  background: var(--tg-border);
}

.contact-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--tg-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-info {
  flex: 1;
  min-width: 0;
}

.contact-name {
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.contact-login {
  font-size: 0.85rem;
  color: var(--tg-text-muted);
}

/* ——— Chat area ——— */
.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--tg-chat-bg);
  min-width: 0;
}

.chat-placeholder {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--tg-text-muted);
  font-size: 1.1rem;
}

.chat-active {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.chat-header {
  padding: 12px 16px 12px 8px;
  border-bottom: 1px solid var(--tg-border);
  font-weight: 600;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 56px;
}

.btn-back {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--tg-text);
  font-size: 1.4rem;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-back:hover {
  background: var(--tg-border);
}

.chat-header-title {
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.msg {
  max-width: 70%;
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 0.95rem;
  line-height: 1.4;
  word-break: break-word;
}

.msg.out {
  align-self: flex-end;
  background: var(--tg-out-msg);
  border-bottom-right-radius: 4px;
}

.msg.in {
  align-self: flex-start;
  background: var(--tg-in-msg);
  border-bottom-left-radius: 4px;
}

.msg-time {
  font-size: 0.75rem;
  color: var(--tg-text-muted);
  margin-top: 4px;
}

.send-wrap {
  border-top: 1px solid var(--tg-border);
  background: var(--tg-panel);
}

.picker-panel {
  padding: 12px;
  max-height: 200px;
  overflow-y: auto;
  display: grid;
  gap: 6px;
  border-bottom: 1px solid var(--tg-border);
}

.picker-panel.emoji-panel {
  grid-template-columns: repeat(8, 1fr);
}

.picker-panel.sticker-panel {
  grid-template-columns: repeat(4, 1fr);
}

.emoji-btn, .sticker-btn {
  width: 100%;
  aspect-ratio: 1;
  max-width: 44px;
  max-height: 44px;
  margin: 0 auto;
  border: none;
  border-radius: 8px;
  background: transparent;
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sticker-btn {
  font-size: 2rem;
  max-width: 56px;
  max-height: 56px;
}

.emoji-btn:hover, .sticker-btn:hover {
  background: var(--tg-border);
}

.send-form {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  align-items: center;
}

.btn-picker {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border: none;
  border-radius: 50%;
  background: var(--tg-input-bg);
  font-size: 1.3rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-picker:hover {
  background: var(--tg-border);
}

.send-form input {
  flex: 1;
  min-width: 0;
  padding: 12px 16px;
  border: 1px solid var(--tg-border);
  border-radius: 24px;
  background: var(--tg-input-bg);
  color: var(--tg-text);
  font-size: 1rem;
}

.send-form .btn-send {
  padding: 12px 20px;
  border: none;
  border-radius: 24px;
  background: var(--tg-accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  flex-shrink: 0;
}

.send-form .btn-send:hover {
  background: var(--tg-accent-hover);
}

.msg-sticker {
  font-size: 3rem;
  line-height: 1;
  text-align: center;
}

/* ——— Admin modal ——— */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-content {
  background: var(--tg-panel);
  border: 1px solid var(--tg-border);
  border-radius: 12px;
  width: 90%;
  max-width: 480px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 16px 48px rgba(0,0,0,0.5);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--tg-border);
}

.modal-header h2 {
  font-size: 1.2rem;
}

.btn-close {
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--tg-text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
}

.btn-close:hover {
  background: var(--tg-border);
  color: var(--tg-text);
}

.modal-body {
  padding: 16px;
  overflow-y: auto;
}

#admin-add-user {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

#admin-add-user input {
  padding: 10px 12px;
  border: 1px solid var(--tg-border);
  border-radius: 8px;
  background: var(--tg-input-bg);
  color: var(--tg-text);
  font-size: 0.95rem;
}

#admin-add-user input:nth-child(1) { flex: 1; min-width: 100px; }
#admin-add-user input:nth-child(2) { flex: 1; min-width: 100px; }
#admin-add-user input:nth-child(3) { flex: 1 1 100%; }

#admin-add-user button {
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  background: var(--tg-accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

.admin-user-list {
  list-style: none;
}

.admin-user-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--tg-border);
  gap: 12px;
}

.admin-user-list li:last-child {
  border-bottom: none;
}

.admin-user-list .user-login {
  font-weight: 500;
}

.admin-user-list .user-display {
  color: var(--tg-text-muted);
  font-size: 0.9rem;
}

.admin-user-list .user-actions {
  display: flex;
  gap: 6px;
}

.admin-user-list .btn-small {
  padding: 6px 12px;
  border: none;
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  background: var(--tg-border);
  color: var(--tg-text);
}

.admin-user-list .btn-small:hover {
  background: var(--tg-accent);
}

.admin-user-list .btn-small.danger:hover {
  background: #c0392b;
}

.new-chat-search {
  width: 100%;
  padding: 10px 14px;
  margin-bottom: 12px;
  border: 1px solid var(--tg-border);
  border-radius: 8px;
  background: var(--tg-input-bg);
  color: var(--tg-text);
  font-size: 1rem;
}

.new-chat-user-list {
  list-style: none;
  max-height: 320px;
  overflow-y: auto;
}

.new-chat-user-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--tg-border);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
}

.new-chat-user-list li:hover {
  background: rgba(255,255,255,0.05);
}

.new-chat-user-list .user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--tg-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.new-chat-user-list .contact-badge {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--tg-text-muted);
}

/* ——— Mobile ——— */
@media (max-width: 768px) {
  #main-screen {
    position: relative;
    overflow: hidden;
  }

  .sidebar {
    position: absolute;
    inset: 0;
    width: 100%;
    max-width: none;
    z-index: 1;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

  .chat-area {
    position: absolute;
    inset: 0;
    z-index: 2;
    transform: translateX(100%);
    transition: transform 0.2s ease;
    visibility: hidden;
  }

  #main-screen.mobile-chat-open .sidebar {
    transform: translateX(-100%);
    visibility: hidden;
    pointer-events: none;
  }

  #main-screen.mobile-chat-open .chat-area {
    transform: translateX(0);
    visibility: visible;
    pointer-events: auto;
  }

  .send-form .btn-send {
    padding: 10px 14px;
    font-size: 0.9rem;
  }

  .picker-panel.emoji-panel {
    grid-template-columns: repeat(6, 1fr);
  }

  .picker-panel.sticker-panel {
    grid-template-columns: repeat(4, 1fr);
  }
}