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

:root {
  --bg: #ededed;
  --surface: #ffffff;
  --input-bg: #f7f7f7;
  --border: #e5e5e5;
  --text: #191919;
  --text-dim: #b2b2b2;
  --text-secondary: #888888;
  --accent: #07c160;
  --danger: #fa5151;
  --bubble-in: #ffffff;
  --bubble-out: #95ec69;
  --radius: 6px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif;
  background: #ffffff;
  color: var(--text);
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

/* ── Login ── */
#login {
  height: 100vh; height: 100dvh;
  justify-content: center; align-items: center;
  flex-direction: column;
  background: #ffffff;
}
.login-box { text-align: center; }
.login-box h1 {
  font-size: 2rem; margin-bottom: 2rem;
  color: var(--accent); font-weight: 700;
}
.login-box input {
  display: block; width: 280px; padding: 12px 16px; margin-bottom: 16px;
  background: var(--input-bg); border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text); font-size: 1rem; outline: none;
}
.login-box input:focus { border-color: var(--accent); }
.login-box button {
  width: 280px; padding: 12px; background: var(--accent); color: #fff;
  border: none; border-radius: var(--radius); font-size: 1rem; font-weight: 600;
  cursor: pointer;
}
.login-box button:active { opacity: 0.85; }

/* ── App layout ── */
#app {
  flex-direction: column;
  height: 100vh; height: 100dvh;
}

#view-contacts, #view-chat {
  flex-direction: column;
  height: 100vh; height: 100dvh;
}

/* ── Header ── */
.chat-header {
  display: flex; align-items: center; justify-content: center;
  position: relative;
  padding: 14px 16px;
  padding-top: calc(14px + env(safe-area-inset-top));
  background: var(--surface);
  border-bottom: 0.5px solid var(--border);
  flex-shrink: 0;
}
.header-title {
  font-size: 1.05rem; font-weight: 600; color: var(--text);
}
.header-btn {
  position: absolute; right: 12px;
  top: calc(10px + env(safe-area-inset-top));
  background: none; border: none; color: var(--text);
  cursor: pointer; padding: 6px;
  -webkit-tap-highlight-color: rgba(0,0,0,0.1);
}
.header-back {
  position: absolute; left: 12px;
  top: calc(10px + env(safe-area-inset-top));
  background: none; border: none; color: var(--text);
  cursor: pointer; padding: 6px;
  -webkit-tap-highlight-color: rgba(0,0,0,0.1);
}

/* ── Contact list ── */
.contact-list {
  flex: 1; overflow-y: auto;
  background: var(--bg);
  -webkit-overflow-scrolling: touch;
}
.contact-item {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px;
  background: var(--surface);
  border-bottom: 0.5px solid var(--border);
  cursor: pointer;
  -webkit-tap-highlight-color: rgba(0,0,0,0.05);
}
.contact-item:active { background: var(--input-bg); }
.contact-avatar {
  width: 44px; height: 44px;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; font-weight: 600;
  flex-shrink: 0;
}
.contact-info {
  flex: 1; min-width: 0;
}
.contact-top {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 4px;
}
.contact-name {
  font-size: 0.95rem; font-weight: 500; color: var(--text);
}
.contact-time {
  font-size: 0.72rem; color: var(--text-secondary);
  flex-shrink: 0; margin-left: 8px;
}
.contact-bottom {
  display: flex; justify-content: space-between; align-items: center;
}
.contact-preview {
  font-size: 0.85rem; color: var(--text-secondary);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  flex: 1;
}
.contact-badge {
  background: var(--danger); color: #fff;
  font-size: 0.68rem; font-weight: 600;
  min-width: 18px; height: 18px;
  border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  padding: 0 5px;
  flex-shrink: 0; margin-left: 8px;
}
.contact-empty {
  text-align: center; color: var(--text-dim);
  padding: 80px 20px; font-size: 0.93rem; line-height: 1.6;
}

/* ── Chat area ── */
.chat-area {
  flex: 1; overflow-y: auto;
  padding: 10px 14px;
  background: var(--bg);
  -webkit-overflow-scrolling: touch;
  display: flex; flex-direction: column; gap: 8px;
}

/* ── Chat bubbles ── */
.chat-row { display: flex; max-width: 80%; }
.chat-row.incoming { align-self: flex-start; }
.chat-row.outgoing { align-self: flex-end; }

.bubble {
  padding: 10px 14px; border-radius: 8px;
  font-size: 0.93rem; line-height: 1.45;
  white-space: pre-wrap; word-break: break-word;
}
.chat-row.incoming .bubble {
  background: var(--bubble-in);
  border-top-left-radius: 2px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.06);
}
.chat-row.outgoing .bubble {
  background: var(--bubble-out);
  border-top-right-radius: 2px;
  color: #000;
}

.bubble-text { color: inherit; }
.bubble-time {
  font-size: 0.68rem; color: var(--text-secondary);
  margin-top: 4px; text-align: right;
}
.chat-row.outgoing .bubble-time { color: rgba(0,0,0,0.45); }

.chat-date {
  text-align: center; font-size: 0.72rem;
  color: var(--text-secondary); padding: 10px 0 4px;
  align-self: center;
}

.chat-empty {
  text-align: center; color: var(--text-dim);
  padding: 80px 20px; align-self: center;
  font-size: 0.93rem; line-height: 1.6;
}

/* ── Input bar ── */
.input-bar {
  display: flex; gap: 8px; padding: 8px 10px;
  border-top: 0.5px solid var(--border);
  background: var(--input-bg);
  flex-shrink: 0; align-items: center;
  padding-bottom: max(8px, env(safe-area-inset-bottom));
}
.input-bar input {
  flex: 1; padding: 9px 14px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 6px; color: var(--text);
  font-size: 0.95rem; outline: none;
}
.input-bar input:focus { border-color: var(--accent); }
.input-bar input::placeholder { color: var(--text-dim); }

.cmd-menu-btn {
  width: 36px; height: 36px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 6px; color: var(--accent);
  cursor: pointer; flex-shrink: 0;
  font-size: 1.15rem; font-weight: 700;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  -webkit-tap-highlight-color: rgba(0,0,0,0.1);
}
.cmd-menu-btn:active { background: var(--border); }

.send-btn {
  height: 36px; padding: 0 14px;
  background: var(--accent); color: #fff;
  border: none; border-radius: 6px;
  font-weight: 600; font-size: 0.88rem;
  cursor: pointer; flex-shrink: 0;
  -webkit-tap-highlight-color: rgba(0,0,0,0.1);
}
.send-btn:active { opacity: 0.8; }

/* ── Overlay ── */
.overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.35); z-index: 100;
}
.overlay.hidden { display: none; }

/* ── Command panel (bottom sheet) ── */
.cmd-panel {
  position: absolute; bottom: 0; left: 0; right: 0;
  background: var(--surface);
  border-top-left-radius: 14px; border-top-right-radius: 14px;
  padding: 6px 0 max(12px, env(safe-area-inset-bottom));
  max-height: 55vh; overflow-y: auto;
}
.panel-handle {
  width: 36px; height: 4px;
  background: var(--border); border-radius: 2px;
  margin: 6px auto 10px;
}
.panel-title {
  font-size: 0.9rem; font-weight: 600;
  padding: 0 16px 10px; color: var(--text-secondary);
  border-bottom: 0.5px solid var(--border);
}
.cmd-list { padding: 4px 0; }
.cmd-item {
  display: flex; align-items: center;
  padding: 14px 16px; cursor: pointer; gap: 12px;
  -webkit-tap-highlight-color: rgba(0,0,0,0.05);
}
.cmd-item:active { background: var(--input-bg); }
.cmd-name {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  color: var(--accent); min-width: 72px;
  font-size: 0.9rem; flex-shrink: 0; font-weight: 600;
}
.cmd-desc { color: var(--text-secondary); font-size: 0.88rem; }
.cmd-empty {
  padding: 20px 16px; text-align: center;
  color: var(--text-dim); font-size: 0.88rem;
}

/* ── Settings panel (right slide) ── */
.settings-panel {
  position: absolute; top: 0; right: 0; bottom: 0;
  width: 280px; max-width: 80vw;
  background: var(--surface);
  box-shadow: -2px 0 12px rgba(0,0,0,0.1);
}
.settings-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px;
  padding-top: calc(14px + env(safe-area-inset-top));
  font-size: 1rem; font-weight: 600;
  border-bottom: 0.5px solid var(--border);
}
.settings-close {
  background: none; border: none; color: var(--text-secondary);
  font-size: 1.5rem; cursor: pointer; padding: 4px 8px; line-height: 1;
}
.setting-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px; border-bottom: 0.5px solid var(--border);
  font-size: 0.93rem;
}
.setting-item button {
  padding: 7px 16px; background: var(--input-bg); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius);
  cursor: pointer; font-size: 0.85rem;
  -webkit-tap-highlight-color: rgba(0,0,0,0.1);
}
.setting-item button:active { background: var(--border); }
.setting-item .btn-danger { color: var(--danger); border-color: var(--danger); background: #fff; }
.setting-item .btn-danger:active { background: var(--danger); color: #fff; }

/* ── Settings: user management ── */
.settings-section-title {
  font-size: 0.8rem; font-weight: 600; color: var(--text-secondary);
  padding: 12px 16px 6px; text-transform: uppercase; letter-spacing: 0.5px;
}
.settings-input {
  flex: 1; padding: 7px 12px;
  background: var(--input-bg); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text);
  font-size: 0.88rem; outline: none; min-width: 0;
}
.settings-input:focus { border-color: var(--accent); }
.settings-input::placeholder { color: var(--text-dim); }
.user-list { max-height: 240px; overflow-y: auto; }
.user-item {
  padding: 10px 16px;
  border-bottom: 0.5px solid var(--border);
}
.user-item-top {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 4px;
}
.user-item-name { font-size: 0.9rem; font-weight: 500; }
.user-item-role {
  font-size: 0.72rem; color: var(--text-secondary);
  background: var(--input-bg); padding: 1px 6px; border-radius: 4px;
}
.user-item-token {
  font-size: 0.72rem; color: var(--text-secondary);
  font-family: "SF Mono", Menlo, Consolas, monospace;
  word-break: break-all; cursor: pointer;
  padding: 3px 6px; background: var(--input-bg); border-radius: 4px;
  margin-top: 2px;
}
.user-item-token:active { background: var(--border); }
.user-token-toast {
  position: fixed; bottom: 80px; left: 50%; transform: translateX(-50%);
  background: rgba(0,0,0,0.75); color: #fff; padding: 8px 20px;
  border-radius: 20px; font-size: 0.85rem; z-index: 200;
  pointer-events: none; opacity: 0; transition: opacity 0.3s;
}
.user-token-toast.show { opacity: 1; }