/* ------------------------------------------------------------------ */
/*  Jatan AI — design tokens                                           */
/* ------------------------------------------------------------------ */

:root {
  color-scheme: light dark;

  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #eef0f4;
  --text: #16181d;
  --muted: #667085;
  --border: #e4e7ec;
  --border-strong: #cfd4dd;

  --accent: #4f46e5;
  --accent-strong: #4338ca;
  --accent-soft: rgba(79, 70, 229, 0.10);
  --on-accent: #ffffff;
  --user-grad: linear-gradient(135deg, #5b54f0 0%, #4338ca 100%);

  --error: #b42318;
  --error-bg: #fef3f2;
  --error-border: #fecdca;

  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06);
  --shadow-md: 0 4px 16px rgba(16, 24, 40, 0.08);
  --ring: 0 0 0 3px rgba(79, 70, 229, 0.22);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0e13;
    --surface: #161922;
    --surface-2: #1e222d;
    --text: #e7e9ee;
    --muted: #949bab;
    --border: #262b38;
    --border-strong: #353c4e;

    --accent: #6f6af0;
    --accent-strong: #5b54e6;
    --accent-soft: rgba(111, 106, 240, 0.16);

    --error: #f97066;
    --error-bg: rgba(240, 68, 56, 0.09);
    --error-border: rgba(240, 68, 56, 0.35);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.45);
    --ring: 0 0 0 3px rgba(111, 106, 240, 0.30);
  }
}

/* ------------------------------------------------------------------ */
/*  Base                                                               */
/* ------------------------------------------------------------------ */

* {
  box-sizing: border-box;
}

.hidden {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
}

.app {
  max-width: 780px;
  margin: 0 auto;
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: 16px 18px;
  padding-top: max(16px, env(safe-area-inset-top));
  padding-bottom: max(14px, env(safe-area-inset-bottom));
}

/* ------------------------------------------------------------------ */
/*  Header                                                             */
/* ------------------------------------------------------------------ */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  flex: none;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  overflow: hidden;
  background: #fff;
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-sm);
}

.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.brand-text {
  min-width: 0;
}

h1 {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 650;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.subtitle {
  margin: 1px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.01em;
}

.upload-toggle {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 13px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  font-size: 0.83rem;
  font-weight: 550;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease,
    color 0.15s ease;
}

.upload-toggle svg {
  width: 14px;
  height: 14px;
  transition: transform 0.2s ease;
}

.upload-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.upload-toggle[aria-expanded="true"] {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.upload-toggle[aria-expanded="true"] svg {
  transform: rotate(45deg);
}

@media (max-width: 440px) {
  .upload-toggle span {
    display: none;
  }
  .upload-toggle {
    padding: 9px;
  }
  .upload-toggle svg {
    width: 16px;
    height: 16px;
  }
}

/* ------------------------------------------------------------------ */
/*  Upload panel                                                       */
/* ------------------------------------------------------------------ */

.upload-panel {
  margin-top: 12px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow-md);
  animation: panel-in 0.22s ease both;
}

.upload-panel.hidden {
  display: none;
}

@keyframes panel-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.upload-panel-head h2 {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 650;
}

.upload-panel-head p {
  margin: 2px 0 12px;
  font-size: 0.78rem;
  color: var(--muted);
}

.upload-fields {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.upload-fields-category {
  margin-top: 8px;
}

select.field {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23667085' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 16px;
  padding-right: 34px;
}

.field {
  flex: 1;
  min-width: 140px;
  padding: 10px 13px;
  border-radius: 11px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 16px; /* prevents iOS zoom-on-focus */
  font-family: inherit;
}

.field:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--ring);
}

.file-field {
  flex: 1.4;
  min-width: 170px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 13px;
  border-radius: 11px;
  border: 1.5px dashed var(--border-strong);
  background: transparent;
  color: var(--muted);
  font-size: 0.86rem;
  cursor: pointer;
  overflow: hidden;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.file-field:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.file-field.has-file {
  border-style: solid;
  border-color: var(--accent);
  color: var(--text);
  background: var(--accent-soft);
}

.file-field svg {
  flex: none;
  width: 15px;
  height: 15px;
}

.file-field span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-field input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.file-field:focus-within {
  box-shadow: var(--ring);
  border-color: var(--accent);
}

.btn-primary {
  padding: 10px 18px;
  border-radius: 11px;
  border: none;
  background: var(--accent);
  color: var(--on-accent);
  font-size: 0.88rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}

.btn-primary:hover {
  background: var(--accent-strong);
}

.btn-primary:active {
  transform: scale(0.97);
}

/* ------------------------------------------------------------------ */
/*  Chat log                                                           */
/* ------------------------------------------------------------------ */

.chat-log {
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 18px 2px;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

.chat-log::-webkit-scrollbar {
  width: 6px;
}

.chat-log::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 999px;
}

.chat-log::-webkit-scrollbar-track {
  background: transparent;
}

/* Empty state ------------------------------------------------------ */

.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
  animation: msg-in 0.3s ease both;
}

.empty-icon {
  width: 58px;
  height: 58px;
  border-radius: 18px;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid;
  place-items: center;
  margin-bottom: 16px;
}

.empty-icon svg {
  width: 27px;
  height: 27px;
}

.empty-state h2 {
  margin: 0 0 6px;
  font-size: 1.05rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.empty-state p {
  margin: 0 0 18px;
  max-width: 380px;
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--muted);
}

/* Messages --------------------------------------------------------- */

.message {
  display: flex;
  align-items: flex-end;
  gap: 9px;
  max-width: 88%;
  animation: msg-in 0.22s ease both;
}

@keyframes msg-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message.user {
  align-self: flex-end;
}

.message.bot,
.message.error {
  align-self: flex-start;
}

.avatar {
  flex: none;
  width: 28px;
  height: 28px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  margin-bottom: 2px;
}

.avatar svg {
  width: 15px;
  height: 15px;
}

.message.bot .avatar {
  background: var(--user-grad);
  color: #fff;
}

.message.error .avatar {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--error);
}

.bubble {
  min-width: 0;
  padding: 11px 15px;
  border-radius: 18px;
  font-size: 0.94rem;
  line-height: 1.5;
}

.message.user .bubble {
  background: var(--user-grad);
  color: var(--on-accent);
  border-bottom-right-radius: 6px;
  box-shadow: var(--shadow-sm);
}

.message.bot .bubble {
  background: var(--surface);
  border: 1px solid var(--border);
  border-bottom-left-radius: 6px;
  box-shadow: var(--shadow-sm);
}

.message.error .bubble {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--error);
  border-bottom-left-radius: 6px;
}

.msg-text {
  white-space: pre-wrap;
  overflow-wrap: break-word;
}

/* Typing indicator ------------------------------------------------- */

.typing-dots {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 0;
}

.typing-dots i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--muted);
  animation: dot-bounce 1.2s infinite ease-in-out;
}

.typing-dots i:nth-child(2) {
  animation-delay: 0.15s;
}

.typing-dots i:nth-child(3) {
  animation-delay: 0.3s;
}

@keyframes dot-bounce {
  0%, 60%, 100% {
    transform: translateY(0);
    opacity: 0.35;
  }
  30% {
    transform: translateY(-4px);
    opacity: 1;
  }
}

.typing-label {
  margin-right: 8px;
  color: var(--muted);
  font-size: 0.88rem;
}

/* Sources ---------------------------------------------------------- */

.sources {
  margin-top: 11px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.sources-label {
  font-size: 0.68rem;
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
  margin-right: 2px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.74rem;
  max-width: 100%;
}

.chip .chip-doc {
  color: var(--text);
  font-weight: 550;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 200px;
}

/* Retrieved context ------------------------------------------------ */

.retrieved {
  margin-top: 12px;
  border-top: 1px solid var(--border);
  padding-top: 10px;
}

.retrieved-label {
  font-size: 0.68rem;
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
  margin-bottom: 7px;
}

.retrieved-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-2);
  overflow: hidden;
}

.retrieved-item + .retrieved-item {
  margin-top: 6px;
}

.retrieved-item summary {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 11px;
  cursor: pointer;
  font-size: 0.8rem;
  color: var(--text);
  list-style: none;
  user-select: none;
}

.retrieved-item summary::-webkit-details-marker {
  display: none;
}

.retrieved-item summary::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: rotate(-45deg);
  transition: transform 0.15s ease;
}

.retrieved-item[open] summary::before {
  transform: rotate(45deg);
}

.retrieved-item summary .doc-name {
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.score-badge {
  flex: none;
  padding: 1px 7px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.7rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.retrieved-body {
  padding: 2px 12px 11px;
  font-size: 0.8rem;
  line-height: 1.55;
  color: var(--muted);
  white-space: pre-wrap;
  overflow-wrap: break-word;
  border-top: 1px dashed var(--border);
  margin-top: 0;
  padding-top: 9px;
}

/* ------------------------------------------------------------------ */
/*  Scope bar                                                          */
/* ------------------------------------------------------------------ */

.scope-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--muted);
}

.scope-bar label {
  flex: none;
}

.scope-bar select {
  flex: none;
  padding: 6px 30px 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background-color: var(--surface);
  color: var(--text);
  font-size: 0.8rem;
  font-weight: 550;
  font-family: inherit;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%234f46e5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  background-size: 15px;
}

.scope-bar select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--ring);
}

/* ------------------------------------------------------------------ */
/*  Composer                                                           */
/* ------------------------------------------------------------------ */

.composer {
  display: flex;
  align-items: center;
  gap: 9px;
  padding-top: 10px;
}

#chat-input {
  flex: 1;
  min-width: 0;
  padding: 13px 18px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 16px; /* prevents iOS zoom-on-focus */
  font-family: inherit;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

#chat-input::placeholder {
  color: var(--muted);
}

#chat-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--ring);
}

#chat-input:disabled {
  opacity: 0.6;
}

.send-btn {
  flex: none;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: var(--on-accent);
  display: grid;
  place-items: center;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: background 0.15s ease, transform 0.1s ease, opacity 0.15s ease;
}

.send-btn svg {
  width: 19px;
  height: 19px;
}

.send-btn:hover {
  background: var(--accent-strong);
}

.send-btn:active {
  transform: scale(0.93);
}

button[type="submit"]:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

/* Focus visibility -------------------------------------------------- */

button:focus-visible,
.retrieved-item summary:focus-visible {
  outline: none;
  box-shadow: var(--ring);
}

/* Reduced motion ---------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}