*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* hidden attribute always wins */
[hidden] { display: none !important; }

:root {
  --black:    #111;
  --gray-9:   #222;
  --gray-7:   #555;
  --gray-5:   #888;
  --gray-3:   #bbb;
  --gray-1:   #f2f2f2;
  --white:    #fff;
  --border:   #e0e0e0;
  --success:  #1a7f3c;
  --warning:  #a05000;
  --error:    #c0392b;
  --info:     #1a5fa0;
  --r:        6px;
  --header-h: 58px;
  --nav-h:    52px;
}

html, body {
  height: 100%;
  background: var(--white);
  color: var(--black);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  overflow: hidden;
  -webkit-text-size-adjust: 100%;
}

/* ── App shell ── */
.app {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  overflow: hidden;
}

/* ── Header ── */
.header {
  flex-shrink: 0;
  height: var(--header-h);
  display: flex;
  align-items: center;
  padding: 0 16px;
  border-bottom: 2px solid var(--black);
  background: var(--white);
  gap: 12px;
}
.header__text { flex: 1; min-width: 0; }
.header__title {
  font-size: 0.88rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.header__sub {
  font-size: 0.65rem;
  color: var(--gray-5);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.header__ws {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.65rem;
  color: var(--gray-5);
}
.ws-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--gray-3); flex-shrink: 0;
}
.ws-dot[data-state="connected"]    { background: var(--success); }
.ws-dot[data-state="disconnected"] { background: var(--gray-3); }

/* ── Carousel ── */
.carousel {
  flex: 1;
  display: flex;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.carousel::-webkit-scrollbar { display: none; }

.slide {
  flex: 0 0 100%;
  width: 100%;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* ── Bottom nav: 3 equal tabs ── */
.page-nav {
  flex-shrink: 0;
  height: var(--nav-h);
  display: flex;
  align-items: stretch;
  border-top: 1px solid var(--border);
  background: var(--white);
}
.page-nav__btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  border-top: 2px solid transparent;
  cursor: pointer;
  font-family: inherit;
  color: var(--gray-5);
  padding: 6px 4px;
  -webkit-tap-highlight-color: transparent;
  transition: color 0.15s;
}
.page-nav__btn:hover  { color: var(--black); }
.page-nav__btn.active { color: var(--black); border-top-color: var(--black); }
.page-nav__label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

/* ── Shared button ── */
.btn-secondary {
  background: none;
  color: var(--black);
  border: 2px solid var(--black);
  border-radius: var(--r);
  padding: 10px 22px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
}
.btn-secondary:active { background: var(--black); color: var(--white); }

/* ── Slide 1: Upload ── */
.slide--upload {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 36px 20px;
}
.upload-wrap { width: 100%; max-width: 420px; }

/* Drag-drop zone — hidden on mobile, shown on desktop */
.upload-zone {
  display: none;
  border: 2px dashed var(--gray-3);
  border-radius: var(--r);
  padding: 36px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  user-select: none;
  -webkit-user-select: none;
}
.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--black);
  background: var(--gray-1);
}
.upload-zone__icon  { font-size: 2.4rem; display: block; margin-bottom: 12px; }
.upload-zone__hint  { font-size: 0.82rem; color: var(--gray-5); margin-bottom: 16px; }
.upload-zone__btn {
  display: inline-block;
  background: var(--black); color: var(--white);
  border-radius: var(--r);
  padding: 10px 24px;
  font-size: 0.85rem; font-weight: 600; cursor: pointer;
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
}

/* Mobile upload button — shown on mobile, hidden on desktop */
.upload-mobile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}
.upload-mobile__icon { font-size: 3.6rem; }
.upload-mobile__hint { font-size: 0.88rem; color: var(--gray-5); max-width: 220px; }
.upload-mobile__btn {
  display: inline-block;
  background: var(--black); color: var(--white);
  border-radius: var(--r);
  padding: 15px 40px;
  font-size: 1rem; font-weight: 700; cursor: pointer;
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
}

.upload-file-input { display: none; }

.upload-msg {
  margin-top: 14px;
  font-size: 0.78rem; color: var(--gray-7);
  text-align: center;
  display: none;
}
.upload-msg.visible { display: block; }

.upload-bar {
  height: 3px; background: var(--gray-1);
  margin-top: 10px; border-radius: 2px; overflow: hidden;
  display: none;
}
.upload-bar.visible { display: block; }
.upload-bar__fill {
  height: 100%; background: var(--black);
  border-radius: 2px; transition: width 0.3s;
}

/* ── Slide 2: Analysis ── */
.slide--analysis {
  display: flex;
  flex-direction: column;
}

/* No-selection state */
.no-selection {
  min-height: calc(100dvh - var(--header-h) - var(--nav-h));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 32px 24px;
  text-align: center;
}
.no-selection__icon  { font-size: 2.8rem; }
.no-selection__title {
  font-size: 0.95rem; font-weight: 600; color: var(--black);
}

/* Processing view */
.processing-view { padding: 20px 16px; }
.processing-view__file {
  font-size: 0.88rem; font-weight: 700;
  margin-bottom: 16px; padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  word-break: break-word;
}
.step-list { list-style: none; }
.step-item {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 7px 0; border-bottom: 1px solid var(--gray-1);
  font-size: 0.8rem;
}
.step-item:last-child { border-bottom: none; }
.step-icon { width: 16px; flex-shrink: 0; font-style: normal; text-align: center; }
.step-icon--done  { color: var(--success); }
.step-icon--run   { color: var(--warning); }
.step-icon--error { color: var(--error); }
.step-icon--wait  { color: var(--gray-3); }
.step-detail { flex: 1; }
.step-step   { font-size: 0.65rem; color: var(--gray-5); margin-top: 1px; font-family: monospace; }

/* Doc view */
.doc-view { flex-shrink: 0; }

.doc-view__head {
  padding: 14px 16px 0;
  border-bottom: 1px solid var(--border);
  background: var(--white);
  position: sticky;
  top: 0;
  z-index: 1;
}
.doc-view__title {
  font-size: 0.9rem; font-weight: 700;
  word-break: break-word; margin-bottom: 3px;
}
.doc-view__meta {
  font-size: 0.72rem; color: var(--gray-5); margin-bottom: 10px;
}

/* Tabs: hidden on mobile, shown on desktop */
.tabs-scroll { display: none; }
.tab-content  { display: none; }

/* Accordion: shown on mobile, hidden on desktop */
.accord-item { border-bottom: 1px solid var(--border); }

.accord-header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 16px;
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  text-align: left;
  -webkit-tap-highlight-color: transparent;
}
.accord-header:active { background: var(--gray-1); }

.accord-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--black);
  flex: 1;
  min-width: 0;
}

.accord-arrow {
  width: 8px; height: 8px;
  flex-shrink: 0;
  border-right: 2px solid var(--gray-5);
  border-bottom: 2px solid var(--gray-5);
  transform: rotate(45deg);
  transition: transform 0.2s;
  margin-left: 14px;
  margin-bottom: 3px;
}
.accord-item.open .accord-arrow {
  transform: rotate(-135deg);
  margin-bottom: -3px;
}

.accord-body  { display: none; }
.accord-item.open .accord-body { display: block; }

.accord-content {
  padding: 4px 16px 16px;
  font-size: 0.83rem; line-height: 1.65;
  white-space: pre-wrap; word-break: break-word;
  color: var(--black);
}

/* Q&A */
.qa-area {
  border-top: 1px solid var(--border);
  padding: 14px 16px 20px;
  background: var(--white);
}
.qa-area__label {
  font-size: 0.65rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--gray-5); margin-bottom: 8px;
}
.qa-row { display: flex; gap: 8px; align-items: flex-end; }
.qa-input {
  flex: 1;
  border: 1px solid var(--border); border-radius: var(--r);
  padding: 10px 12px; font-size: 0.88rem; font-family: inherit;
  resize: none; color: var(--black); background: var(--white);
  -webkit-appearance: none;
  min-height: 48px; max-height: 120px;
  line-height: 1.4;
}
.qa-input:focus { outline: none; border-color: var(--black); }
.qa-btn {
  flex-shrink: 0;
  height: 48px; padding: 0 18px;
  background: var(--black); color: var(--white);
  border: none; border-radius: var(--r);
  font-size: 0.88rem; font-weight: 600; cursor: pointer; font-family: inherit;
  -webkit-tap-highlight-color: transparent;
}
.qa-btn:disabled { background: var(--gray-3); cursor: default; }

.chat {
  margin-top: 12px;
  display: flex; flex-direction: column; gap: 10px;
}
.chat-msg { font-size: 0.83rem; line-height: 1.55; white-space: pre-wrap; word-break: break-word; }
.chat-msg__who {
  font-size: 0.65rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--gray-5); margin-bottom: 4px;
}
.chat-msg--user  { padding: 10px 12px; background: var(--gray-1); border-radius: var(--r); }
.chat-msg--agent { padding: 10px 12px; border: 1px solid var(--border); border-radius: var(--r); }
.chat-msg--error { padding: 10px 12px; border: 1px solid var(--error); border-radius: var(--r); color: var(--error); }
.chat-thinking   { color: var(--gray-5); font-style: italic; }

/* ── Slide 3: Documents ── */
.slide--docs {
  display: flex;
  flex-direction: column;
}

.docs-header {
  flex-shrink: 0;
  padding: 12px 16px;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray-5);
  border-bottom: 1px solid var(--border);
  background: var(--white);
  position: sticky;
  top: 0;
  z-index: 1;
}

.doc-list { padding: 4px 8px 8px; }

.doc-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border-radius: var(--r);
  border: 1px solid transparent;
  margin-bottom: 3px;
  transition: background 0.1s, border-color 0.1s;
  -webkit-tap-highlight-color: transparent;
}
.doc-item:not(.doc-item--failed) { cursor: pointer; }
.doc-item:not(.doc-item--failed):hover  { background: var(--gray-1); }
.doc-item.active { background: var(--gray-1); border-color: var(--black); }

.doc-item__body { flex: 1; min-width: 0; }
.doc-item__name {
  font-size: 0.83rem; font-weight: 500;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.doc-item__meta { font-size: 0.7rem; color: var(--gray-5); margin-top: 2px; }
.doc-item__badge {
  display: inline-block;
  font-size: 0.6rem; font-weight: 700; text-transform: uppercase;
  padding: 1px 5px; border-radius: 2px; margin-right: 4px;
  border: 1px solid currentColor;
}
.doc-item__badge--uploaded   { color: var(--info); }
.doc-item__badge--processing { color: var(--warning); }
.doc-item__badge--processed  { color: var(--success); }
.doc-item__badge--failed     { color: var(--error); }

.doc-item__actions { flex-shrink: 0; display: flex; gap: 6px; }
.doc-action {
  padding: 5px 10px;
  font-size: 0.72rem; font-weight: 600;
  border-radius: var(--r);
  cursor: pointer;
  font-family: inherit;
  background: none;
  -webkit-tap-highlight-color: transparent;
}
.doc-action--retry  { color: var(--warning); border: 1px solid var(--warning); }
.doc-action--delete { color: var(--error);   border: 1px solid var(--error); }
.doc-action:active  { opacity: 0.7; }

.doc-list-empty {
  padding: 48px 16px;
  text-align: center;
}
.doc-list-empty__msg { font-size: 0.83rem; color: var(--gray-5); margin-bottom: 16px; }

/* ── Desktop (≥ 768px) ── */
@media (min-width: 768px) {
  .header__title { font-size: 1rem; }
  .header__sub   { font-size: 0.72rem; }

  /* Upload: show drag-drop zone, hide mobile button */
  .upload-zone   { display: block; }
  .upload-mobile { display: none; }
  .slide--upload { padding: 48px 40px; }
  .upload-zone   { padding: 52px 40px; }
  .upload-zone__icon { font-size: 3rem; }
  .upload-wrap   { max-width: 480px; }

  /* Analysis: show tabs, hide accordion */
  .tabs-scroll {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    margin-bottom: -1px;
  }
  .tabs-scroll::-webkit-scrollbar { display: none; }
  .tabs { display: flex; white-space: nowrap; }
  .tab-btn {
    padding: 8px 13px;
    font-size: 0.72rem; font-weight: 600;
    background: none; border: none; border-bottom: 2px solid transparent;
    color: var(--gray-5); cursor: pointer; font-family: inherit;
    transition: color 0.1s; flex-shrink: 0;
    -webkit-tap-highlight-color: transparent;
  }
  .tab-btn:hover  { color: var(--black); }
  .tab-btn.active { color: var(--black); border-bottom-color: var(--black); }

  .tab-content {
    display: block;
    padding: 16px;
    font-size: 0.83rem; line-height: 1.65;
    white-space: pre-wrap; word-break: break-word;
  }
  .tab-content--empty { color: var(--gray-5); font-style: italic; }

  .accordion { display: none; }

  .doc-view__head { padding: 16px 20px 0; }
  .doc-view__title { font-size: 1rem; }
  .doc-list  { padding: 4px 12px 16px; }
  .docs-header { padding: 12px 20px; }
}

/* ── Scrollbar ── */
::-webkit-scrollbar       { width: 4px; height: 4px; }
::-webkit-scrollbar-thumb { background: var(--gray-3); border-radius: 2px; }