:root {
  color-scheme: light dark;
  --header-bg: rgba(248, 248, 248, 0.92);
  --header-border: rgba(0, 0, 0, 0.12);
  --app-bg: #ffffff;
  --text-primary: #000000;
  --text-secondary: #8e8e93;
  --composer-bg: rgba(248, 248, 248, 0.92);
  --input-bg: #ffffff;
  --input-border: #d1d1d6;
  --accent: #0a84ff;
  --accent-text: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --header-bg: rgba(28, 28, 30, 0.92);
    --header-border: rgba(255, 255, 255, 0.12);
    --app-bg: #000000;
    --text-primary: #ffffff;
    --text-secondary: #8e8e93;
    --composer-bg: rgba(28, 28, 30, 0.92);
    --input-bg: #1c1c1e;
    --input-border: #3a3a3c;
    --accent: #0a84ff;
    --accent-text: #ffffff;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  overscroll-behavior: none;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  background: var(--app-bg);
  color: var(--text-primary);
}

.app {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  height: 100dvh;
  background: var(--app-bg);
}

/* Header */
.app-header {
  position: relative;
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding-top: calc(env(safe-area-inset-top, 0px) + 10px);
  padding-bottom: 8px;
  padding-left: env(safe-area-inset-left, 0px);
  padding-right: env(safe-area-inset-right, 0px);
  background: var(--header-bg);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--header-border);
  z-index: 10;
}

.app-header h1 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.app-subtitle {
  margin: 2px 0 0;
  font-size: 12px;
  color: var(--text-secondary);
}

.app-subtitle.online {
  color: #34c759;
}

.logout-button {
  position: absolute;
  right: calc(env(safe-area-inset-right, 0px) + 12px);
  bottom: 8px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--input-border);
  border-radius: 12px;
}

.logout-button:active {
  opacity: 0.6;
}

.background-controls {
  position: absolute;
  left: calc(env(safe-area-inset-left, 0px) + 12px);
  bottom: 8px;
  display: flex;
  gap: 6px;
}

.background-button,
.background-clear-button {
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--input-border);
  border-radius: 12px;
}

.background-button:active,
.background-clear-button:active {
  opacity: 0.6;
}

.app.has-custom-bg .empty-state {
  background: rgba(0, 0, 0, 0.35);
  color: #ffffff;
  padding: 16px 20px;
  border-radius: 16px;
}

/* Notification permission banner */
.notify-banner {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  padding-left: calc(env(safe-area-inset-left, 0px) + 12px);
  padding-right: calc(env(safe-area-inset-right, 0px) + 12px);
  background: var(--header-bg);
  border-bottom: 1px solid var(--header-border);
  font-size: 13px;
  color: var(--text-secondary);
}

.notify-banner[hidden] {
  display: none;
}

.notify-enable-button {
  flex: 0 0 auto;
  padding: 5px 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-text);
  background: var(--accent);
  border: none;
  border-radius: 14px;
}

.notify-enable-button:active {
  opacity: 0.7;
}

/* Conversation area */
.conversation {
  flex: 1 1 auto;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 16px;
  padding-left: calc(env(safe-area-inset-left, 0px) + 16px);
  padding-right: calc(env(safe-area-inset-right, 0px) + 16px);
  display: flex;
  flex-direction: column;
}

.empty-state {
  margin: auto;
  text-align: center;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.5;
}

.empty-state p {
  margin: 0;
}

/* Message bubbles */
.message-row {
  display: flex;
  margin: 3px 0;
}

.message-row.own {
  justify-content: flex-end;
}

.message-row.other {
  justify-content: flex-start;
}

.bubble {
  max-width: 100%;
  padding: 8px 14px;
  border-radius: 20px;
  font-size: 16px;
  line-height: 1.3;
  word-wrap: break-word;
  white-space: pre-wrap;
}

.message-row.own .bubble {
  background: var(--accent);
  color: var(--accent-text);
  border-bottom-right-radius: 6px;
}

.message-row.other .bubble {
  background: var(--input-bg);
  color: var(--text-primary);
  border: 1px solid var(--input-border);
  border-bottom-left-radius: 6px;
}

.message-column {
  display: flex;
  flex-direction: column;
  max-width: 75%;
}

.message-row.own .message-column {
  align-items: flex-end;
}

.message-row.other .message-column {
  align-items: flex-start;
}

.translation-panel {
  display: none;
  margin: 4px 4px 0;
  padding: 8px 12px;
  max-width: 100%;
  border-radius: 12px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-primary);
  font-size: 13px;
  line-height: 1.45;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.translation-panel.open {
  display: block;
}

.translation-panel.loading {
  color: var(--text-secondary);
  font-style: italic;
}

/* Composer */
.composer {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  padding-bottom: calc(env(safe-area-inset-bottom, 0px) + 8px);
  padding-left: calc(env(safe-area-inset-left, 0px) + 12px);
  padding-right: calc(env(safe-area-inset-right, 0px) + 12px);
  background: var(--composer-bg);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--header-border);
}

.message-input {
  flex: 1 1 auto;
  min-width: 0;
  padding: 9px 14px;
  font-size: 16px;
  border-radius: 20px;
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  color: var(--text-primary);
  outline: none;
}

.message-input::placeholder {
  color: var(--text-secondary);
}

.send-button {
  flex: 0 0 auto;
  padding: 9px 16px;
  font-size: 16px;
  font-weight: 600;
  color: var(--accent-text);
  background: var(--accent);
  border: none;
  border-radius: 20px;
  cursor: pointer;
}

.send-button:active {
  opacity: 0.7;
}

/* Login page */
.login-wrap {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  padding-top: calc(env(safe-area-inset-top, 0px) + 24px);
  padding-bottom: calc(env(safe-area-inset-bottom, 0px) + 24px);
  background: var(--app-bg);
}

.login-card {
  width: 100%;
  max-width: 320px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.login-title {
  margin: 0;
  text-align: center;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.login-subtitle {
  margin: 0 0 12px;
  text-align: center;
  font-size: 14px;
  color: var(--text-secondary);
}

.field-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.login-input {
  width: 100%;
  border-radius: 10px;
  margin-bottom: 4px;
}

.login-error {
  min-height: 18px;
  margin: 4px 0 0;
  font-size: 13px;
  color: #ff3b30;
  text-align: center;
}

.login-submit {
  width: 100%;
  margin-top: 8px;
  border-radius: 10px;
  text-align: center;
}