/* Clean white theme, subtle gray accents */
:root {
  --bg: #ffffff;
  --text: #0b1220;
  --muted: #657189;
  --border: #e6e9f0;
  --card: #f7f9fc;
  --brand: #111827;
  --accent: #1f6feb; /* tasteful blue */
}
/* Dark theme overrides */
:root.dark {
  --bg: #000000;           /* pure black background */
  --text: #e5e7eb;         /* light gray text for contrast */
  --muted: #9aa4b2;        /* muted text */
  --border: #222222;       /* neutral dark border */
  --card: #0a0a0a;         /* near-black card surfaces */
  --brand: #e5e7eb;        /* brand text color in dark */
  --accent: #8ab4f8;       /* keep tasteful blue accent */
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

/* Nav */
.nav { position: sticky; top: 0; background: rgba(255,255,255,0.8); backdrop-filter: saturate(180%) blur(10px); border-bottom: 1px solid var(--border); z-index: 10; }
.nav__inner { max-width: 1000px; margin: 0 auto; padding: 12px 16px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--brand); }
.brand__logo { height: 32px; width: 32px; border-radius: 8px; display: grid; place-items: center; font-weight: 700; background: #111827; color: #fff; }
.brand__text { font-weight: 600; letter-spacing: -0.01em; }
.nav__right { display: inline-flex; align-items: center; gap: 12px; }
.links { display: none; gap: 16px; }
.link { color: var(--muted); text-decoration: none; font-weight: 500; }
.link:hover { color: var(--text); }
.link--active { color: var(--text); }
@media (min-width: 768px) { .links { display: inline-flex; } }

/* Toggle button */
.toggle { background: var(--card); color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 6px 8px; cursor: pointer; font: inherit; display: inline-flex; align-items: center; justify-content: center; line-height: 0; }
.toggle:hover { filter: brightness(0.98); }

/* Main */
.container { max-width: 800px; margin: 0 auto; padding: 20px 16px 120px; }
.intro { margin: 6px 0 12px; }
.intro__title { font-size: 24px; margin: 0 0 6px; letter-spacing: -0.02em; }
.intro__subtitle { margin: 0; color: var(--muted); }

/* Chat */
.chat { background: transparent; border: none; padding: 0; display: flex; flex-direction: column; }
.thread { padding: 4px; display: grid; gap: 10px; align-content: start; padding-bottom: 96px; }
.msg { display: grid; grid-template-columns: 36px 1fr; gap: 10px; }
.msg__avatar { height: 36px; width: 36px; border-radius: 10px; display: grid; place-items: center; font-weight: 700; }
.msg--user .msg__avatar { background: #111827; color: #fff; }
.msg--bot .msg__avatar { background: #1f6feb; color: #fff; }
.msg__bubble { border: 1px solid var(--border); background: var(--card); padding: 8px 10px; border-radius: 10px; }
.msg__meta { font-size: 12px; color: var(--muted); margin-bottom: 2px; display: flex; align-items: center; gap: 6px; }

/* Copy message button */
.msg__copy {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  padding: 2px;
  border-radius: 4px;
  display: inline-grid;
  place-items: center;
  opacity: 0;
  transition: opacity 0.15s ease;
}
.msg__bubble:hover .msg__copy { opacity: 1; }
.msg__copy:hover { color: var(--text); background: var(--card); }
.msg__copy--done { opacity: 1; color: #22c55e; }

/* Typing indicator */
.typing { display: inline-flex; align-items: center; gap: 6px; height: 16px; }
.typing__dot { width: 6px; height: 6px; border-radius: 50%; background: var(--muted); opacity: 0.4; animation: pmx-typing 1.2s infinite ease-in-out; }
.typing__dot:nth-child(2) { animation-delay: 0.15s; }
.typing__dot:nth-child(3) { animation-delay: 0.3s; }
@keyframes pmx-typing { 0% { transform: translateY(0); opacity: 0.4; } 30% { transform: translateY(-2px); opacity: 0.9; } 60% { transform: translateY(0); opacity: 0.6; } 100% { transform: translateY(0); opacity: 0.4; } }

@media (prefers-reduced-motion: reduce) {
  .typing__dot { animation: none; opacity: 0.7; }
}

/* Composer */
.composer {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: 8px;
  z-index: 20;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 6px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px;
  align-items: center;
  background: var(--bg);
  backdrop-filter: saturate(180%) blur(6px);
  box-shadow: 0 -6px 16px rgba(0,0,0,0.04);
  width: calc(100% - 32px);
  max-width: 800px;
}
.input { resize: none; border: none; outline: none; padding: 8px 10px; font: inherit; color: var(--text); background: transparent; }
.button { background: var(--text); color: #fff; border: none; padding: 8px 12px; border-radius: 9px; font-weight: 600; cursor: pointer; }
.button--icon { display: inline-grid; place-items: center; padding: 6px; }
.button--icon svg { display: block; width: 16px; height: 16px; }
.button[disabled] { opacity: 0.6; cursor: not-allowed; }
.input:disabled { opacity: 0.5; cursor: not-allowed; background: var(--card); }
.footnote { margin-top: 8px; color: var(--muted); font-size: 12px; text-align: center; }
.msg__billing { margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--border); color: var(--muted); font-size: 11px; font-style: italic; }

/* Actions group in composer */
.actions { position: relative; display: inline-flex; gap: 6px; align-items: center; }
.button--ghost { background: var(--card); color: var(--text); border: 1px solid var(--border); }
.button--ghost:hover { filter: brightness(0.98); }

/* Inference Quality selector */
.quality-selector { display: flex; align-items: center; }
.quality-select {
  font: inherit;
  font-size: 12px;
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px 8px;
  cursor: pointer;
  outline: none;
}
.quality-select:hover { filter: brightness(0.98); }
.quality-select:focus { border-color: var(--accent); }

/* Tools dropdown */
.tools-dropdown { position: relative; }

.tools-menu {
  min-width: 200px;
  max-height: 300px;
  overflow-y: auto;
}

.menu__header {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  padding: 8px 10px 4px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 6px;
}

.category-list {
  display: grid;
  gap: 4px;
  padding: 0 4px 4px;
}

.category-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: transparent;
  border: none;
  border-radius: 6px;
  transition: background 0.15s ease;
  cursor: pointer;
}

.category-item:hover {
  background: var(--card);
}

.category-item__checkbox {
  cursor: pointer;
  width: 14px;
  height: 14px;
  margin: 0;
}

.category-item__info {
  flex: 1;
  cursor: pointer;
  min-width: 0;
}

.category-item__name {
  display: block;
  font-weight: 500;
  font-size: 13px;
}

.category-item--default {
  opacity: 0.6;
}

.category-item--default .category-item__checkbox {
  cursor: not-allowed;
}

.category-item--default .category-item__info {
  cursor: default;
}

.category-item--default .category-item__name::after {
  content: " ✓";
  font-size: 10px;
  color: var(--accent);
}

/* Export menu */
.export { position: relative; }
.menu { position: absolute; right: 0; bottom: calc(100% + 6px); background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: 10px; box-shadow: 0 8px 24px rgba(0,0,0,0.08); min-width: 160px; padding: 6px; z-index: 30; }
.menu__item { display: block; width: 100%; background: transparent; border: none; color: var(--text); text-align: left; padding: 8px 10px; border-radius: 8px; font: inherit; cursor: pointer; }
.menu__item:hover { background: var(--card); }

/* A11y */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

/* Height-constrained screens: tighten vertical rhythm so page fits at 100% zoom */
@media (max-height: 900px) {
  .nav__inner { padding: 8px 12px; }
  .brand__logo { height: 28px; width: 28px; border-radius: 7px; }
  .container { padding: 14px 12px 100px; }
  .intro { margin: 4px 0 8px; }
  .intro__title { font-size: 24px; }
  .intro__subtitle { font-size: 14px; }
  .chat { padding: 0; }
  .thread { padding-bottom: 88px; }
  .msg { grid-template-columns: 32px 1fr; gap: 8px; }
  .msg__avatar { height: 32px; width: 32px; border-radius: 8px; }
  .msg__bubble { padding: 7px 9px; border-radius: 9px; }
  .composer { bottom: 8px; padding: 5px; gap: 5px; border-radius: 9px; }
  .input { padding: 7px 9px; }
  .button { padding: 7px 10px; border-radius: 8px; }
  .footnote { display: none; }
}

/* Dark-specific tweaks */
.dark .nav { background: rgba(0,0,0,0.8); }
.dark .toggle { background: #0a0a0a; color: #e5e7eb; border-color: #222222; }
.dark .button { background: var(--accent); color: #0b1220; }
.dark .button--ghost { background: #0a0a0a; color: #e5e7eb; border-color: #222222; }
.dark .menu { background: #0a0a0a; border-color: #222222; box-shadow: 0 8px 24px rgba(0,0,0,0.4); }
.dark .menu__item:hover { background: #111111; }
.dark .quality-select { background: #0a0a0a; color: #e5e7eb; border-color: #222222; }

/* ─────────────────────────────────────────────────────────────────
   Rich Markdown Content Styles (for marked.js rendering)
   ───────────────────────────────────────────────────────────────── */

.msg__content {
  line-height: 1.6;
}

/* Headers */
.msg__content h1,
.msg__content h2,
.msg__content h3,
.msg__content h4 {
  margin: 0.8em 0 0.4em;
  font-weight: 600;
  line-height: 1.3;
}
.msg__content h1 { font-size: 1.4em; }
.msg__content h2 { font-size: 1.2em; }
.msg__content h3 { font-size: 1.1em; }
.msg__content h4 { font-size: 1em; color: var(--muted); }

/* Paragraphs */
.msg__content p {
  margin: 0.5em 0;
}
.msg__content p:first-child { margin-top: 0; }
.msg__content p:last-child { margin-bottom: 0; }

/* Lists */
.msg__content ul,
.msg__content ol {
  margin: 0.5em 0;
  padding-left: 1.5em;
}
.msg__content li {
  margin: 0.25em 0;
}
.msg__content li > p { margin: 0; }

/* Inline code */
.msg__content code {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.15em 0.4em;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 0.9em;
}

/* Code blocks */
.msg__content pre {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  overflow-x: auto;
  margin: 0.75em 0;
  font-size: 0.85em;
  line-height: 1.5;
}
.msg__content pre code {
  background: transparent;
  border: none;
  padding: 0;
  font-size: inherit;
}

/* Tables */
.msg__content table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.75em 0;
  font-size: 0.9em;
}
.msg__content th,
.msg__content td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
}
.msg__content th {
  background: var(--card);
  font-weight: 600;
}
.msg__content tr:nth-child(even) td {
  background: rgba(0,0,0,0.02);
}
.dark .msg__content tr:nth-child(even) td {
  background: rgba(255,255,255,0.02);
}

/* Blockquotes */
.msg__content blockquote {
  margin: 0.75em 0;
  padding: 0.5em 1em;
  border-left: 3px solid var(--accent);
  background: var(--card);
  color: var(--muted);
}
.msg__content blockquote p { margin: 0; }

/* Horizontal rules */
.msg__content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1em 0;
}

/* Links */
.msg__content a {
  color: var(--accent);
  text-decoration: none;
}
.msg__content a:hover {
  text-decoration: underline;
}

/* Strong and emphasis */
.msg__content strong { font-weight: 600; }
.msg__content em { font-style: italic; }

/* Dark mode code blocks */
.dark .msg__content pre {
  background: #0a0a0a;
  border-color: #222;
}
.dark .msg__content code {
  background: #0a0a0a;
  border-color: #222;
}

/* ==================== Credits Badge ==================== */
.credits-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.75rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  margin-right: 0.5rem;
}

.dark .credits-badge {
  background: #1a1a1a;
  border-color: #333;
}

/* ==================== Settings Panel ==================== */
.settings-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 24rem;
  max-width: 90vw;
  height: 100vh;
  background: var(--bg);
  border-left: 1px solid var(--border);
  box-shadow: -4px 0 12px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.settings-panel--open {
  transform: translateX(0);
}

.dark .settings-panel {
  background: #0f0f0f;
  border-left-color: #222;
  box-shadow: -4px 0 12px rgba(0, 0, 0, 0.5);
}

.settings-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.dark .settings-panel__header {
  border-bottom-color: #222;
}

.settings-panel__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0;
  color: var(--text);
}

.settings-panel__content {
  padding: 1.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
}

.input-group {
  display: flex;
  gap: 0.5rem;
}

.form-input {
  flex: 1;
  padding: 0.625rem 0.75rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  font-size: 0.875rem;
  font-family: 'IBM Plex Mono', monospace;
  color: var(--text);
  transition: border-color 0.2s;
}

.form-input:focus {
  outline: none;
  border-color: var(--accent);
}

.dark .form-input {
  background: #1a1a1a;
  border-color: #333;
}

.form-hint {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: var(--muted);
}

.form-actions {
  display: flex;
  gap: 0.75rem;
}

.button--primary {
  background: var(--accent);
  color: white;
  padding: 0.625rem 1.25rem;
  border: none;
  border-radius: 0.375rem;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.2s;
}

.button--primary:hover {
  opacity: 0.9;
}

.button--full-width {
  width: 100%;
  margin-top: 0.75rem;
}

.balance-section {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.dark .balance-section {
  border-top-color: #222;
}

.balance-card {
  padding: 1.25rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
}

.dark .balance-card {
  background: #1a1a1a;
  border-color: #333;
}

.balance-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.balance-amount {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.75rem;
}

/* ==================== Modal ==================== */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 2000;
  align-items: center;
  justify-content: center;
}

.modal--open {
  display: flex;
}

.modal__overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.dark .modal__overlay {
  background: rgba(0, 0, 0, 0.7);
}

.modal__content {
  position: relative;
  width: 90%;
  max-width: 28rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  overflow: hidden;
}

.dark .modal__content {
  background: #0f0f0f;
  border-color: #222;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6);
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.dark .modal__header {
  border-bottom-color: #222;
}

.modal__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0;
  color: var(--text);
}

.modal__body {
  padding: 1.5rem;
}

.modal__description {
  margin: 0 0 1.5rem;
  font-size: 0.875rem;
  color: var(--muted);
}

/* ==================== Package Grid ==================== */
.package-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.package-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1.25rem 1rem;
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all 0.2s;
}

.package-btn:hover {
  border-color: var(--accent);
  background: var(--bg);
  transform: translateY(-2px);
}

.dark .package-btn {
  background: #1a1a1a;
  border-color: #333;
}

.dark .package-btn:hover {
  background: #222;
  border-color: var(--accent);
}

.package-price {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.package-credits {
  font-size: 0.75rem;
  color: var(--muted);
}

.test-info {
  padding: 1rem;
  background: #fff8dc;
  border: 1px solid #ffd700;
  border-radius: 0.375rem;
  font-size: 0.75rem;
  color: #805500;
}

.dark .test-info {
  background: #1a1602;
  border-color: #806d00;
  color: #ffd700;
}

.test-info code {
  padding: 0.125rem 0.375rem;
  background: rgba(0, 0, 0, 0.1);
  border-radius: 0.25rem;
  font-family: 'IBM Plex Mono', monospace;
}

.dark .test-info code {
  background: rgba(255, 255, 255, 0.1);
}

/* ==================== Toast Notifications ==================== */
.toast-container {
  position: fixed;
  bottom: 90px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  pointer-events: none;
}
.toast {
  background: var(--text);
  color: var(--bg);
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 13px;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.2s, transform 0.2s;
  pointer-events: auto;
  white-space: nowrap;
  max-width: 320px;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.toast--show { opacity: 1; transform: translateY(0); }
.toast--success { background: #22c55e; color: #fff; }
.toast--error { background: #ef4444; color: #fff; }

/* ==================== Error Message Styling ==================== */
.msg--error .msg__bubble {
  border-color: #fca5a5;
  background: #fff1f2;
}
.dark .msg--error .msg__bubble {
  border-color: #7f1d1d;
  background: #1a0505;
}
.msg--error .msg__avatar {
  background: #ef4444;
}