/* ---------- Design tokens ---------- */
:root {
  --bg-main: #131A26;
  --bg-sidebar: #0E141E;
  --bg-panel: #1B2333;
  --border: #263047;
  --text: #EDEAE0;
  --text-soft: #8B93A7;
  --gold: #C9962E;
  --gold-deep: #A87A1F;
  --user-bubble: #2A3348;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
}

body {
  background: var(--bg-main);
  font-family: var(--font-body);
  color: var(--text);
}

.app {
  display: flex;
  height: 100vh; /* fallback for older browsers */
  height: 100dvh; /* accounts for mobile browser toolbars — prevents the input row being pushed off-screen */
}

/* ===================== Sidebar ===================== */
.sidebar {
  width: 240px;
  flex-shrink: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 16px 12px;
}

.sidebar-top {
  flex-shrink: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px 18px 8px;
}

.brand-mark {
  color: var(--gold);
  font-size: 18px;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: 0.02em;
}

.new-chat-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 9px 12px;
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: 13.5px;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.new-chat-btn:hover {
  background: var(--bg-panel);
  border-color: var(--gold);
}

.new-chat-btn .plus {
  color: var(--gold);
  font-weight: 700;
}

.chat-history {
  flex: 1;
  overflow-y: auto;
  margin-top: 20px;
}

.history-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-soft);
  padding: 4px 8px 8px 8px;
}

.history-item {
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 13.5px;
  color: var(--text-soft);
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 2px;
}

.history-item:hover {
  background: var(--bg-panel);
  color: var(--text);
}

.history-item.active {
  background: var(--bg-panel);
  color: var(--text);
  border-left: 2px solid var(--gold);
}

.sidebar-bottom {
  flex-shrink: 0;
  padding: 10px 8px 2px 8px;
  border-top: 1px solid var(--border);
  margin-top: 8px;
}

.account-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 2px 8px;
}

.logout-link {
  background: transparent;
  border: none;
  color: var(--text-soft);
  font-size: 12px;
  cursor: pointer;
  text-decoration: underline;
  flex-shrink: 0;
}

.logout-link:hover {
  color: var(--text);
}

/* ===================== Login gate ===================== */
.login-gate {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-main);
  background-image:
    radial-gradient(circle at 15% 10%, rgba(255,255,255,0.03), transparent 40%),
    radial-gradient(circle at 85% 90%, rgba(255,255,255,0.03), transparent 40%);
  padding: 20px;
}

.login-gate.hidden {
  display: none;
}

.login-box {
  text-align: center;
  max-width: 320px;
}

.stamp-mark {
  color: var(--gold);
  font-size: 34px;
  margin-bottom: 14px;
}

.login-box h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 26px;
  margin: 0 0 8px 0;
  color: var(--text);
}

.login-box p {
  color: var(--text-soft);
  font-size: 14px;
  margin: 0 0 22px 0;
}

.login-btn {
  background: var(--gold);
  color: var(--navy-deep, #16202E);
  border: none;
  border-radius: 8px;
  padding: 12px 26px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  width: 100%;
}

.login-btn:hover {
  background: var(--gold-deep);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.auth-form input {
  width: 100%;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 11px 14px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 14.5px;
}

.auth-form input:focus {
  outline: 2px solid var(--gold);
  outline-offset: 1px;
}

.auth-toggle {
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-soft);
}

.link-btn {
  background: none;
  border: none;
  color: var(--gold);
  font-size: 13px;
  cursor: pointer;
  text-decoration: underline;
  padding: 0;
  margin-left: 4px;
}

.link-btn:hover {
  color: var(--gold-deep);
}

.auth-error {
  margin-top: 14px;
  font-size: 13px;
  color: #E0765A;
}

.auth-error.hidden {
  display: none;
}

.app.hidden {
  display: none;
}

.settings-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: none;
  color: var(--text-soft);
  padding: 8px;
  font-family: var(--font-body);
  font-size: 13px;
  cursor: pointer;
  border-radius: 6px;
  margin-bottom: 6px;
}

.settings-btn:hover {
  background: var(--bg-panel);
  color: var(--text);
}

.settings-btn .gear {
  color: var(--gold);
}

.user-tag {
  display: block;
  font-size: 12px;
  color: var(--text-soft);
  padding: 2px 8px;
}

/* ===================== History item controls ===================== */
.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
}

.history-item-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history-item-menu {
  flex-shrink: 0;
  background: transparent;
  border: none;
  color: var(--text-soft);
  font-size: 15px;
  padding: 2px 6px;
  cursor: pointer;
  border-radius: 4px;
  opacity: 0;
}

.history-item:hover .history-item-menu {
  opacity: 1;
}

.history-item-menu:hover {
  background: var(--border);
  color: var(--text);
}

/* ===================== Settings modal ===================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 20px;
}

.modal-overlay.hidden {
  display: none;
}

.modal {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  width: 100%;
  max-width: 420px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.modal-header h2 {
  font-family: var(--font-display);
  font-size: 18px;
  margin: 0;
  font-weight: 600;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-soft);
  font-size: 16px;
  cursor: pointer;
  padding: 4px 8px;
}

.modal-close:hover {
  color: var(--text);
}

.modal-body {
  padding: 18px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal .field-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-soft);
  margin-bottom: 6px;
}

.modal select,
.modal textarea {
  width: 100%;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 9px 10px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 14px;
  resize: vertical;
}

.modal select:focus,
.modal textarea:focus {
  outline: 2px solid var(--gold);
  outline-offset: 1px;
}

.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 13.5px;
  color: var(--text);
  cursor: pointer;
}

.checkbox-row input {
  margin-top: 3px;
  accent-color: var(--gold);
}

.modal-footer {
  padding: 14px 18px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.save-btn {
  width: 100%;
  background: var(--gold);
  color: var(--navy-deep, #16202E);
  border: none;
  border-radius: 6px;
  padding: 10px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
}

.save-btn:hover {
  background: var(--gold-deep);
}

/* ===================== Main area ===================== */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  position: relative;
}

/* Empty state, centered */
.greeting-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 20px;
}

.greeting-state.hidden {
  display: none;
}

.greeting-mark {
  color: var(--gold);
  font-size: 30px;
  margin-bottom: 14px;
}

.greeting-state h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 30px;
  margin: 0 0 8px 0;
}

.greeting-sub {
  color: var(--text-soft);
  font-size: 14px;
  margin: 0;
}

/* Message thread */
.chat-log {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 32px 20px 16px 20px;
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
}

.chat-log.hidden {
  display: none;
}

.message {
  display: flex;
  gap: 10px;
}

.message.user {
  justify-content: flex-end;
}

.message.assistant {
  justify-content: flex-start;
}

.avatar {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  margin-top: 2px;
}

.message.assistant .avatar {
  background: transparent;
  border: 1.5px dashed var(--gold);
  color: var(--gold);
  font-size: 13px;
}

.message.user .avatar {
  background: var(--gold);
  color: var(--navy-deep, #16202E);
  order: 2;
}

.message-body {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-width: 78%;
}

.message.assistant .message-body {
  max-width: calc(100% - 38px);
}

.bubble {
  padding: 11px 15px;
  border-radius: 10px;
  font-size: 15px;
  line-height: 1.5;
  white-space: pre-wrap;
}

.message.assistant .bubble {
  background: transparent;
  color: var(--text);
  padding-left: 0;
}

.message.assistant .bubble p {
  margin: 0 0 12px 0;
}

.message.assistant .bubble p:last-child {
  margin-bottom: 0;
}

.message.assistant .bubble ol,
.message.assistant .bubble ul {
  margin: 0 0 12px 0;
  padding-left: 22px;
}

.message.assistant .bubble li {
  margin-bottom: 4px;
}

.message.assistant .bubble strong {
  color: var(--text);
  font-weight: 700;
}

.message.user .bubble {
  background: var(--user-bubble);
  color: var(--text);
}

.message.status .bubble {
  color: var(--text-soft);
  font-style: italic;
  padding-left: 0;
}

.message.status.error .bubble {
  color: #E0765A;
}

.message-image {
  max-width: 220px;
  border-radius: 10px;
  display: block;
}

/* Copy / action row under assistant messages */
.message-actions {
  display: flex;
  gap: 4px;
}

.action-btn {
  background: transparent;
  border: none;
  color: var(--text-soft);
  font-size: 12px;
  padding: 4px 8px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
}

.action-btn:hover {
  background: var(--bg-panel);
  color: var(--text);
}

/* Input bar */
.chat-input-row {
  flex-shrink: 0;
  display: flex;
  gap: 8px;
  align-items: flex-end;
  max-width: 720px;
  width: calc(100% - 40px);
  margin: 0 auto 24px auto;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 10px 10px 10px 10px;
}

.chat-input-row:focus-within {
  border-color: var(--gold);
}

.attach-btn {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-soft);
  font-size: 17px;
  line-height: 1;
  cursor: pointer;
  margin-bottom: 2px;
}

.attach-btn:hover {
  border-color: var(--gold);
  color: var(--gold);
}

.input-stack {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.attachment-preview {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 4px;
}

.attachment-preview.hidden {
  display: none;
}

.attachment-preview img {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: 6px;
}

.attachment-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px 8px;
  font-size: 12.5px;
  color: var(--text-soft);
}

.attachment-remove {
  background: transparent;
  border: none;
  color: var(--text-soft);
  cursor: pointer;
  font-size: 14px;
  padding: 0 2px;
}

.attachment-remove:hover {
  color: #E0765A;
}

#userInput {
  flex: 1;
  resize: none;
  border: none;
  background: transparent;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  max-height: 160px;
  padding: 6px 0;
}

#userInput:focus {
  outline: none;
}

#userInput::placeholder {
  color: var(--text-soft);
}

#sendBtn {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: none;
  background: var(--gold);
  color: #16202E;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s ease;
}

#sendBtn:hover { background: var(--gold-deep); }

#sendBtn:disabled {
  background: var(--border);
  color: var(--text-soft);
  cursor: not-allowed;
}

#sendBtn:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

/* ===================== Mobile ===================== */
/* ===================== Mobile ===================== */

/* Hidden on desktop — only shown inside the mobile media query below */
.mobile-menu-btn {
  display: none;
}

.sidebar-backdrop {
  display: none;
}

@media (max-width: 720px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 78vw;
    max-width: 280px;
    transform: translateX(-100%);
    transition: transform 0.22s ease;
    z-index: 30;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  /* Dark backdrop behind the open sidebar — tapping it closes the menu */
  .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 25;
  }

  .sidebar-backdrop.hidden {
    display: none;
  }

  /* Small top bar with a menu button, since the sidebar is hidden by default */
  .mobile-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 18px;
    position: fixed;
    top: 14px;
    left: 14px;
    z-index: 15;
    cursor: pointer;
  }

  .main {
    padding-top: 58px;
  }

  .greeting-state h1 { font-size: 22px; }
  .greeting-sub { font-size: 13px; padding: 0 12px; }

  .chat-log { padding: 20px 14px 12px 14px; }
  .bubble { max-width: 88%; font-size: 14.5px; }

  .chat-input-row {
    width: calc(100% - 24px);
    padding: 8px 8px 8px 14px;
  }

  /* Bigger tap targets throughout on touch screens */
  .history-item { padding: 10px; }
  .history-item-menu {
    opacity: 1; /* always visible on mobile — no hover state to reveal it */
    font-size: 18px;
    padding: 6px 10px;
  }
  .new-chat-btn { padding: 11px 12px; }
  .settings-btn { padding: 10px; }

  #sendBtn { width: 38px; height: 38px; }

  .modal { max-width: 100%; margin: 0 8px; }
}