:root {
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;

  --chat-max: 1100px;
  --bubble-max: 72ch;
  --bubble-max-mobile: 92%;
  --touch-target: 44px;
}

html,
body {
  height: 100%;
}

body {
  background-color: #f8f9fa;
}

/* App shell: constrain scrolling to message list */
.app-shell {
  height: 100dvh;
  height: calc(var(--vh, 1vh) * 100);
  width: 100%;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  background: #fff;
  border-right: 1px solid #dee2e6;
}

/* Offcanvas width: responsive on mobile, fixed on desktop */
.sidebar.offcanvas {
  width: min(92vw, 360px);
}

@media (min-width: 768px) {
  .sidebar {
    width: 340px;
    min-width: 340px;
    overflow-y: auto;
  }

  .sidebar.offcanvas {
    width: 340px;
    position: static;
    transform: none !important;
    visibility: visible !important;
    height: 100%;
    border-right: 1px solid #dee2e6;
    background: #fff;
  }

  .sidebar.offcanvas .offcanvas-body {
    overflow-y: auto;
  }
}

/* Chat layout */
.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: #fff;
  position: relative;
}

.chat-topbar {
  z-index: 2;
}

.chat-messages {
  flex: 1;
  overflow: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  display: flex;
  justify-content: center;
}

.chat-list {
  width: 100%;
  max-width: var(--chat-max);
  padding: var(--space-4) var(--space-4);
  padding-bottom: calc(var(--space-4) * 1.25);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  min-width: 0;
}

@media (min-width: 768px) {
  .chat-list {
    padding: calc(var(--space-4) * 1.5) calc(var(--space-4) * 1.5);
    padding-bottom: 2rem; /* Increased padding at bottom */
  }
}

@media (max-width: 767.98px) {
  .chat-list {
    padding: var(--space-4) var(--space-3);
    padding-bottom: 2rem; /* Increased padding at bottom */
  }

  /* Mobile: keep meta compact */
  .msg-meta-provider,
  .msg-meta-actions {
    display: none !important;
  }

  /* Mobile: prevent modals from horizontal scrolling */
  .modal-content,
  .modal-body {
    overflow-x: hidden;
  }

  .modal-body pre,
  .modal-body code {
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    word-break: break-word;
  }
}

/* Message rows + bubbles (no margin hacks) */
.msg-row {
  display: flex;
  width: 100%;
  min-width: 0;
}

.msg-row--user {
  justify-content: flex-end;
}

.msg-row--assistant {
  justify-content: flex-start;
}

.msg-row--system {
  justify-content: center;
}

.msg-bubble {
  max-width: min(var(--bubble-max), var(--bubble-max-mobile));
  min-width: 0;
}

@media (min-width: 768px) {
  .msg-bubble {
    max-width: var(--bubble-max);
  }
}

.message-bubble {
  padding: 1.25rem;
  border-radius: 1.25rem;
  line-height: 1.6;
  position: relative;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  margin: 0;
}

.user-msg {
  background: linear-gradient(135deg, #0d6efd, #0a58ca);
  color: #fff;
  border-bottom-right-radius: 0.25rem;
}

.ai-msg {
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  color: #212529;
  border-bottom-left-radius: 0.25rem;
}

/* Metadata row */
.msg-meta {
  border-top: 1px solid #e9ecef;
  margin-top: 1rem;
  padding-top: 0.5rem;
}

.msg-meta-part {
  font-size: 0.875rem;
  line-height: 1.2;
}

.msg-meta-provider {
  cursor: help;
}

.user-msg .msg-meta {
  border-top-color: rgba(255, 255, 255, 0.2);
}

/* Touch targets */
.btn-icon {
  min-width: var(--touch-target);
  min-height: var(--touch-target);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Composer: keyboard + safe area friendly */
.chat-composer {
  background: #fff;
  padding: calc(var(--space-4) * 1.25) var(--space-4);
  padding-bottom: calc(var(--space-4) + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid #dee2e6;
}

@media (max-width: 767.98px) {
  .chat-composer {
    padding: var(--space-4) var(--space-3);
    padding-bottom: calc(var(--space-3) + env(safe-area-inset-bottom, 0px));
  }
}

.composer-wrap {
  width: 100%;
  max-width: var(--chat-max);
  margin: 0 auto;
}

/* Jump to latest pill sits above composer */
.jump-latest {
  position: absolute;
  top: calc(-1 * (var(--touch-target) + var(--space-2)));
  left: 50%;
  transform: translateX(-50%);
}

/* Ensure shadows read consistently on both bubble types */
.user-msg,
.ai-msg {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

/* Thinking indicator (used while generating) */
.thinking-indicator {
  display: inline-flex;
  gap: 0.35rem;
  align-items: center;
}

.thinking-indicator span {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 999px;
  background: rgba(33, 37, 41, 0.35);
  animation: thinking 1.2s infinite ease-in-out;
}

.thinking-indicator span:nth-child(2) {
  animation-delay: 0.15s;
}

.thinking-indicator span:nth-child(3) {
  animation-delay: 0.3s;
}

@keyframes thinking {
  0%,
  80%,
  100% {
    transform: translateY(0);
    opacity: 0.4;
  }
  40% {
    transform: translateY(-3px);
    opacity: 1;
  }
}

textarea:focus {
  box-shadow: none !important;
  border-color: #0d6efd !important;
}

.progress {
  height: 8px;
  border-radius: 4px;
  background-color: #e9ecef;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.05);
}

/* Modal & Utility Polish */
.letter-spacing-1 {
  letter-spacing: 1px;
}

.hover-lift {
  transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.hover-lift:hover {
  transform: translateY(-2px);
}

.modal-content {
  box-shadow: 0 1rem 3rem rgba(0,0,0,.175)!important;
}

/* Nav Pills Polish */
.nav-pills .nav-link {
  color: var(--bs-gray-600);
  transition: all 0.2s;
}

.nav-pills .nav-link:hover {
  background-color: #e9ecef;
}

.nav-pills .nav-link.active {
  background-color: var(--bs-primary);
  color: white;
  box-shadow: 0 2px 12px rgba(13, 110, 253, 0.3);
}

/* Form Polish */
.form-floating > .form-control:focus ~ label {
  color: var(--bs-primary);
}

.form-control:focus, .form-select:focus {
  border-color: var(--bs-primary);
  box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.15);
}

/* WATERMARK STYLES (Clean Flow Layout) */

/* 1. Base Watermark (Hidden by default or for 'Workhop') */
.message-bubble::before {
  content: attr(data-sender);
  display: none; /* Default hidden */
  /* Remove absolute positioning. Flow naturally. */
  font-size: 1rem; /* Same as body text */
  font-weight: 700; /* Bold */
  color: rgba(33, 37, 41, 0.4); /* Faint but readable grey */
  pointer-events: none;
  white-space: nowrap;
  text-transform: none; 
  /* The Discrete Separator: */
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  margin-bottom: 0.75rem;
  padding-bottom: 0.25rem;
}

/* 2. Show Watermark ONLY if sender is NOT 'Workhop' */
.message-bubble:not([data-sender="Workhop"])::before {
  display: block;
}

/* 3. Adjust Text (No extra padding needed now, as ::before is block flow) */
.message-bubble:not([data-sender="Workhop"]) > * {
  /* Just ensure z-index if needed */
  position: relative;
  z-index: 1;
}

/* 4. Special styling for User ('You') to match blue bg */
.user-msg::before {
  color: rgba(255, 255, 255, 0.6);
  border-bottom-color: rgba(255, 255, 255, 0.2);
}

/* 5. Assistant Bubble Spacing (Outer Spacing) */
.msg-row--assistant {
  /* Current padding is absorbed by list gap. Increase margin significantly. */
  margin-bottom: 2rem; 
}

/* 6. Extra Metadata Spacing */
.msg-row--assistant .msg-meta {
  margin-top: 1rem;
}