/* --- Reset & base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0f0f1a;
  --surface: #1a1a2e;
  --surface-hover: #222240;
  --primary: #5b8def;
  --primary-dark: #4a7de0;
  --text: #e0e0e8;
  --text-secondary: #9090a8;
  --border: #2a2a45;
  --bubble-self: #2a4a8f;
  --bubble-other: #2a2a45;
  --danger: #e05555;
  --success: #4caf84;
  --warn: #d9a544;
  --radius: 10px;
  --radius-sm: 6px;
  --radius-lg: 16px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --header-h: 52px;
  --input-h: 56px;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

#app {
  height: 100%;
  display: flex;
  flex-direction: column;
  max-width: 800px;
  margin: 0 auto;
  background: var(--surface);
  min-height: 100dvh;
}

.view { display: none; flex-direction: column; flex: 1; height: 100%; }
.view.active { display: flex; }

/* --- Connection banner --- */
.conn-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  text-align: center;
  font-size: 13px;
  padding: 8px 12px;
  background: rgba(217, 165, 68, 0.95);
  color: #1a1a1a;
  font-weight: 600;
}
.conn-banner.hidden { display: none; }

/* --- Home view --- */
.home-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 20px;
  text-align: center;
}
.home-wrapper h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: -0.5px;
}
.subtitle {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 28px;
}
.home-form {
  width: 100%;
  max-width: 340px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

input[type="text"] {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s;
}
input[type="text"]:focus { border-color: var(--primary); }
input[type="text"]::placeholder { color: var(--text-secondary); }

.btn {
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  border: none;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s;
  white-space: nowrap;
}
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn.primary { background: var(--primary); color: #fff; }
.btn.primary:hover:not(:disabled) { background: var(--primary-dark); }
.btn.secondary { background: var(--border); color: var(--text); }
.btn.secondary:hover:not(:disabled) { background: var(--surface-hover); }
.btn.small { padding: 8px 14px; font-size: 13px; border-radius: var(--radius-sm); }
.btn-icon {
  background: none;
  border: none;
  color: var(--primary);
  font-size: 14px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}
.btn-icon:hover { background: var(--surface-hover); }

.divider {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 13px;
  margin: 4px 0;
}
.divider::before, .divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.join-section {
  display: flex;
  gap: 8px;
}
.join-section input {
  flex: 1;
  text-transform: lowercase;
  letter-spacing: 1px;
}

.error-msg {
  color: var(--danger);
  font-size: 13px;
  margin-top: 8px;
  min-height: 20px;
}
.home-tip {
  color: var(--text-secondary);
  font-size: 12px;
  margin-top: 16px;
}

/* --- Invite view --- */
.invite-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 20px;
  text-align: center;
}
.invite-wrapper h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 4px;
}
#qrcode-container {
  margin: 20px 0;
  padding: 16px;
  background: #fff;
  border-radius: var(--radius);
}
#qrcode-container img { display: block; width: 200px; height: 200px; }

.room-link-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  max-width: 340px;
  width: 100%;
}
#room-link-text {
  flex: 1;
  font-size: 13px;
  color: var(--text-secondary);
  word-break: break-all;
  text-align: left;
}
.status-text { margin-top: 20px; color: var(--text-secondary); font-size: 14px; }

/* --- Chat view --- */
.chat-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
  height: var(--header-h);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
#chat-title { flex: 1; font-weight: 600; font-size: 15px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#online-status {
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 12px;
  background: var(--border);
  color: var(--text-secondary);
  flex-shrink: 0;
}
#online-status.online { background: #1a3a2a; color: var(--success); }

.message-list {
  flex: 1;
  overflow-y: auto;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  scroll-behavior: smooth;
}
.message-list::-webkit-scrollbar { width: 4px; }
.message-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.msg-row {
  display: flex;
  flex-direction: column;
  max-width: 80%;
}
.msg-row.self { align-self: flex-end; align-items: flex-end; }
.msg-row.other { align-self: flex-start; align-items: flex-start; }

.msg-sender {
  font-size: 11px;
  color: var(--text-secondary);
  margin-bottom: 2px;
  padding: 0 4px;
}

.msg-bubble {
  padding: 8px 12px;
  border-radius: var(--radius);
  font-size: 15px;
  line-height: 1.5;
  word-break: break-word;
  white-space: pre-wrap;
}
.msg-row.self .msg-bubble {
  background: var(--bubble-self);
  border-bottom-right-radius: 4px;
}
.msg-row.other .msg-bubble {
  background: var(--bubble-other);
  border-bottom-left-radius: 4px;
}

.msg-footer {
  display: flex;
  gap: 6px;
  align-items: center;
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 2px;
  padding: 0 4px;
}
.msg-status { color: var(--text-secondary); }
.msg-row.self .msg-status.ready { color: var(--success); }

.msg-system {
  align-self: center;
  font-size: 12px;
  color: var(--text-secondary);
  padding: 4px 12px;
  border-radius: 10px;
  background: rgba(255,255,255,0.04);
}

.typing-indicator {
  font-size: 12px;
  color: var(--text-secondary);
  padding: 2px 14px 4px;
  font-style: italic;
  flex-shrink: 0;
}
.typing-indicator.hidden { display: none; }

.input-area {
  display: flex;
  gap: 8px;
  padding: 8px 10px;
  padding-bottom: calc(8px + var(--safe-bottom));
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--surface);
}
.input-area input {
  flex: 1;
  border-radius: 20px;
  padding: 10px 16px;
}
.send-btn {
  border-radius: 20px;
  padding: 10px 20px;
}

/* --- Responsive --- */
@media (min-width: 480px) {
  .home-wrapper h1 { font-size: 32px; }
  .home-form { max-width: 400px; }
  .msg-row { max-width: 70%; }
}

@media (min-width: 768px) {
  #app { border-left: 1px solid var(--border); border-right: 1px solid var(--border); }
  .msg-row { max-width: 60%; }
}