/* =========================================================
   BASHAN ASSESSMENT v4.1
   Single authoritative conversation-app layout.
   ========================================================= */

:root {
  --bashan-app-height: 100dvh;
  --bashan-app-offset-top: 0px;
  --bashan-v4-content-width: 920px;
  --bashan-v4-composer-width: 920px;
  --bashan-v4-gap: 12px;
  --bashan-v4-radius: 18px;
}

html.bashan-ai-overlay-open,
body.bashan-ai-overlay-open {
  overflow: hidden !important;
  overscroll-behavior: none !important;
}

/* =========================================================
   FULL-SCREEN APPLICATION SHELL
   ========================================================= */

#bashan-ai-chat.bashan-v4-open {
  position: fixed !important;
  top: var(--bashan-app-offset-top, 0px) !important;
  right: 0 !important;
  bottom: auto !important;
  left: 0 !important;
  width: 100vw !important;
  max-width: none !important;
  height: 100vh !important;
  height: 100dvh !important;
  height: var(--bashan-app-height, 100dvh) !important;
  min-height: 0 !important;
  max-height: none !important;
  margin: 0 !important;
  padding: 0 !important;
  box-sizing: border-box !important;
  overflow: hidden !important;
  z-index: 2147483000 !important;
  grid-template-rows: auto minmax(0, 1fr) auto !important;
  grid-template-columns: minmax(0, 1fr) !important;
  align-items: stretch !important;
  justify-items: stretch !important;
  overscroll-behavior: none !important;
  isolation: isolate;
}

/* =========================================================
   COMPACT HEADER
   ========================================================= */

#bashan-ai-chat .ai-overlay-header {
  position: relative !important;
  width: 100% !important;
  max-width: none !important;
  min-width: 0 !important;
  min-height: 0 !important;
  margin: 0 !important;
  padding: max(8px, env(safe-area-inset-top)) 14px 8px 14px !important;
  box-sizing: border-box !important;
  overflow: hidden !important;
  z-index: 4;
}

#bashan-ai-chat .ai-overlay-header > :not(.bashan-v4-header-bar) {
  display: none !important;
}

#bashan-ai-chat .bashan-v4-header-bar {
  width: min(100%, var(--bashan-v4-content-width)) !important;
  min-height: 42px !important;
  margin: 0 auto !important;
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  gap: 12px !important;
  box-sizing: border-box !important;
}

#bashan-ai-chat .bashan-v4-title {
  min-width: 0;
  font-size: clamp(18px, 2vw, 22px) !important;
  font-weight: 700 !important;
  line-height: 1.15 !important;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

#bashan-ai-chat .bashan-v4-header-actions {
  min-width: 0;
  display: flex !important;
  align-items: center !important;
  justify-content: flex-end !important;
  gap: 10px !important;
}

#bashan-ai-lang-badge {
  width: auto !important;
  max-width: 180px !important;
  margin: 0 !important;
  padding: 0 !important;
  line-height: 1.2 !important;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#bashan-ai-close {
  flex: 0 0 auto !important;
  margin: 0 !important;
}

/* =========================================================
   BODY / PRE-SESSION STAGE
   ========================================================= */

#bashan-ai-chat .ai-overlay-body {
  position: relative !important;
  width: 100% !important;
  max-width: none !important;
  min-width: 0 !important;
  min-height: 0 !important;
  margin: 0 !important;
  padding: 12px 16px !important;
  box-sizing: border-box !important;
  overflow-y: auto !important;
  overflow-x: hidden !important;
  overscroll-behavior: contain !important;
  -webkit-overflow-scrolling: touch;
}

/* Once a session starts, v4 owns the central viewport completely. */
#bashan-ai-chat .ai-overlay-body.bashan-v4-session-active {
  display: flex !important;
  flex-direction: column !important;
  min-height: 0 !important;
  padding: 0 !important;
  overflow: hidden !important;
}

#bashan-ai-chat .ai-overlay-body.bashan-v4-session-active > :not(.bashan-v4-conversation) {
  display: none !important;
}

/* =========================================================
   CONVERSATION VIEWPORT
   ========================================================= */

#bashan-ai-chat .bashan-v4-conversation {
  display: none;
  flex: 1 1 auto !important;
  width: 100% !important;
  min-width: 0 !important;
  min-height: 0 !important;
  box-sizing: border-box !important;
  overflow: hidden !important;
}

#bashan-ai-chat.bashan-v4-session-active .bashan-v4-conversation {
  display: flex !important;
  flex-direction: column !important;
}

#bashan-ai-feed {
  flex: 1 1 auto !important;
  width: min(100%, var(--bashan-v4-content-width)) !important;
  max-width: var(--bashan-v4-content-width) !important;
  height: 100% !important;
  min-width: 0 !important;
  min-height: 0 !important;
  max-height: none !important;
  margin: 0 auto !important;
  padding: 18px 18px 24px 18px !important;
  box-sizing: border-box !important;
  overflow-y: auto !important;
  overflow-x: hidden !important;
  scroll-behavior: smooth;
  overscroll-behavior: contain !important;
  scrollbar-gutter: stable;
  -webkit-overflow-scrolling: touch;
}

.bashan-message {
  width: fit-content;
  max-width: min(78%, 760px) !important;
  margin: 8px 0 !important;
  padding: 11px 14px !important;
  box-sizing: border-box !important;
  border-radius: 16px !important;
  white-space: pre-wrap !important;
  overflow-wrap: anywhere !important;
  word-break: break-word !important;
  line-height: 1.5 !important;
  text-align: start;
}

.bashan-message-user {
  margin-left: auto !important;
  margin-right: 0 !important;
  background: #3898ec !important;
  color: #ffffff !important;
  border-bottom-right-radius: 6px !important;
}

.bashan-message-ai {
  margin-left: 0 !important;
  margin-right: auto !important;
  background: rgba(255, 255, 255, 0.10) !important;
  color: #ffffff !important;
  border-bottom-left-radius: 6px !important;
}

/* =========================================================
   FOOTER / PERSISTENT COMPOSER
   ========================================================= */

#bashan-ai-chat .ai-overlay-footer {
  position: relative !important;
  width: 100% !important;
  max-width: none !important;
  min-width: 0 !important;
  min-height: 0 !important;
  margin: 0 !important;
  padding: 0 !important;
  box-sizing: border-box !important;
  z-index: 5;
}

#bashan-ai-chat .ai-overlay-footer.bashan-v4-session-active {
  padding: 8px 14px max(10px, env(safe-area-inset-bottom)) 14px !important;
}

#bashan-ai-chat .ai-overlay-footer.bashan-v4-session-active > :not(.bashan-v4-composer) {
  display: none !important;
}

#bashan-ai-chat .bashan-v4-composer {
  display: none;
  width: min(100%, var(--bashan-v4-composer-width)) !important;
  max-width: var(--bashan-v4-composer-width) !important;
  min-width: 0 !important;
  margin: 0 auto !important;
  padding: 8px !important;
  box-sizing: border-box !important;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--bashan-v4-radius) !important;
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

#bashan-ai-chat .bashan-v4-composer.bashan-v4-composer-active {
  display: block !important;
}

#bashan-ai-chat .bashan-v4-composer-row {
  display: grid !important;
  grid-template-columns: auto minmax(0, 1fr) auto !important;
  align-items: end !important;
  gap: 8px !important;
  width: 100% !important;
  min-width: 0 !important;
}

#bashan-ai-input.bashan-v4-input {
  display: block;
  width: 100% !important;
  max-width: none !important;
  min-width: 0 !important;
  min-height: 56px !important;
  max-height: 168px !important;
  margin: 0 !important;
  padding: 14px 14px !important;
  box-sizing: border-box !important;
  resize: none !important;
  overflow-x: hidden !important;
  font-size: 16px !important;
  line-height: 1.45 !important;
  border-radius: 14px !important;
}

#bashan-ai-input[dir='rtl'] {
  text-align: right !important;
}

#bashan-ai-input[dir='ltr'] {
  text-align: left !important;
}

#bashan-ai-chat .bashan-v4-control {
  display: inline-flex;
  align-items: center !important;
  justify-content: center !important;
  flex: 0 0 auto !important;
  width: auto !important;
  min-width: 72px !important;
  max-width: 124px !important;
  min-height: 48px !important;
  margin: 0 !important;
  padding: 9px 12px !important;
  box-sizing: border-box !important;
  white-space: nowrap !important;
}

#bashan-ai-chat .bashan-v4-mic-select-mount {
  display: none !important;
  width: 100% !important;
  min-width: 0 !important;
  margin: 0 0 6px 0 !important;
  padding: 0 4px !important;
  box-sizing: border-box !important;
  align-items: center !important;
  justify-content: flex-start !important;
  gap: 7px !important;
}

#bashan-ai-chat .bashan-v4-mic-select-mount.bashan-mic-select-visible {
  display: flex !important;
}

#bashan-ai-chat .bashan-v4-mic-select-mount[dir='rtl'] {
  direction: rtl !important;
}

#bashan-ai-chat .bashan-v4-mic-select-label {
  flex: 0 0 auto !important;
  margin: 0 !important;
  padding: 0 !important;
  color: rgba(255, 255, 255, 0.78) !important;
  font-size: 12px !important;
  font-weight: 600 !important;
  line-height: 1.2 !important;
  white-space: nowrap !important;
}

#bashan-ai-mic-select {
  display: none;
  flex: 0 1 360px !important;
  width: auto !important;
  min-width: 0 !important;
  max-width: 360px !important;
  min-height: 34px !important;
  height: 34px !important;
  margin: 0 !important;
  padding: 5px 30px 5px 10px !important;
  box-sizing: border-box !important;
  border: 1px solid rgba(255, 255, 255, 0.18) !important;
  border-radius: 9px !important;
  background-color: rgba(10, 15, 31, 0.92) !important;
  color: #ffffff !important;
  font-size: 13px !important;
  font-weight: 500 !important;
  line-height: 1.2 !important;
  box-shadow: none !important;
  color-scheme: dark;
}

#bashan-ai-mic-select[dir='rtl'] {
  text-align: right !important;
  padding-right: 10px !important;
  padding-left: 30px !important;
}

#bashan-ai-mic-select[dir='ltr'] {
  text-align: left !important;
}

#bashan-ai-mic-select.bashan-mic-select-visible {
  display: block !important;
}

#bashan-ai-mic-select:focus {
  outline: 2px solid rgba(56, 152, 236, 0.72) !important;
  outline-offset: 1px !important;
  border-color: rgba(56, 152, 236, 0.88) !important;
}

#bashan-ai-mic-select:disabled {
  opacity: 0.58 !important;
  cursor: not-allowed !important;
}

#bashan-ai-mic-select option {
  background: #0a0f1f !important;
  color: #ffffff !important;
}

/* Compact, transient status text: never a separate control. */
#bashan-ai-status.bashan-v4-status {
  display: none !important;
  width: 100% !important;
  min-height: 0 !important;
  margin: 0 0 6px 0 !important;
  padding: 0 4px !important;
  box-sizing: border-box !important;
  font-size: 13px !important;
  line-height: 1.35 !important;
  opacity: 0.88;
}

#bashan-ai-status.bashan-v4-status.bashan-v4-status-visible {
  display: block !important;
}

/* =========================================================
   MOBILE / TABLET
   ========================================================= */

@media (max-width: 767px) {
  :root {
    --bashan-v4-gap: 8px;
  }

  #bashan-ai-chat .ai-overlay-header {
    padding-top: max(6px, env(safe-area-inset-top)) !important;
    padding-right: 10px !important;
    padding-bottom: 6px !important;
    padding-left: 10px !important;
  }

  #bashan-ai-chat .bashan-v4-header-bar {
    min-height: 38px !important;
  }

  #bashan-ai-chat .bashan-v4-title {
    font-size: 18px !important;
  }

  #bashan-ai-lang-badge {
    max-width: 110px !important;
    font-size: 12px !important;
  }

  #bashan-ai-feed {
    padding: 12px 10px 16px 10px !important;
  }

  .bashan-message {
    max-width: 88% !important;
    margin-top: 6px !important;
    margin-bottom: 6px !important;
    padding: 10px 12px !important;
  }

  #bashan-ai-chat .ai-overlay-footer.bashan-v4-session-active {
    padding-top: 6px !important;
    padding-right: 8px !important;
    padding-bottom: max(7px, env(safe-area-inset-bottom)) !important;
    padding-left: 8px !important;
  }

  #bashan-ai-chat .bashan-v4-composer {
    padding: 6px !important;
    border-radius: 16px !important;
  }

  #bashan-ai-chat .bashan-v4-composer-row {
    gap: 6px !important;
  }

  #bashan-ai-chat .bashan-v4-mic-select-mount {
    gap: 6px !important;
    margin-bottom: 5px !important;
    padding-right: 2px !important;
    padding-left: 2px !important;
  }

  #bashan-ai-chat .bashan-v4-mic-select-label {
    font-size: 11px !important;
  }

  #bashan-ai-mic-select {
    flex-basis: 300px !important;
    max-width: min(300px, calc(100% - 76px)) !important;
    min-height: 32px !important;
    height: 32px !important;
    font-size: 12px !important;
  }

  #bashan-ai-input.bashan-v4-input {
    min-height: 52px !important;
    max-height: 132px !important;
    padding: 12px !important;
  }

  #bashan-ai-chat .bashan-v4-control {
    min-width: 64px !important;
    max-width: 96px !important;
    min-height: 46px !important;
    padding: 8px 9px !important;
    font-size: 14px !important;
  }

  #bashan-ai-status.bashan-v4-status {
    font-size: 12px !important;
    margin-bottom: 5px !important;
  }
}

@media (max-width: 420px) {
  #bashan-ai-chat .bashan-v4-control {
    min-width: 58px !important;
    max-width: 82px !important;
    padding-left: 7px !important;
    padding-right: 7px !important;
    font-size: 13px !important;
  }
}

@media (max-height: 650px) {
  #bashan-ai-chat .ai-overlay-header {
    padding-top: max(4px, env(safe-area-inset-top)) !important;
    padding-bottom: 4px !important;
  }

  #bashan-ai-chat .bashan-v4-header-bar {
    min-height: 34px !important;
  }

  #bashan-ai-feed {
    padding-top: 8px !important;
    padding-bottom: 10px !important;
  }

  #bashan-ai-chat .ai-overlay-footer.bashan-v4-session-active {
    padding-top: 4px !important;
    padding-bottom: max(5px, env(safe-area-inset-bottom)) !important;
  }

  #bashan-ai-input.bashan-v4-input {
    min-height: 48px !important;
    max-height: 108px !important;
  }

  #bashan-ai-chat .bashan-v4-control {
    min-height: 44px !important;
  }
}

/* =========================================================
   ACCESSIBILITY / MOTION
   ========================================================= */

@media (prefers-reduced-motion: reduce) {
  #bashan-ai-feed {
    scroll-behavior: auto;
  }
}