/* ═══════════════════════════════════════════════════════════════
   styles.css  —  arXiv Summary Tool
   Depends on theme.css being loaded first.
   ═══════════════════════════════════════════════════════════════ */

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

body {
  background: var(--background-color);
  color: var(--text-color);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ── App shell ── */
.app-shell {
  max-width: 860px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
}

/* ── Brand / toolbar ── */
.toolbar {
  background: var(--card-bg-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem 1rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
}

.brand {
  display: flex;
  align-items: center;
  gap: .875rem;
  margin-bottom: 1rem;
}

.mark {
  width: 40px; height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 1rem; color: #fff; flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.brand h1 { font-size: 1.1rem; font-weight: 700; letter-spacing: -.01em; color: var(--text-primary); }
.brand p  { font-size: .78rem; color: var(--text-secondary); }

/* ── Mode tabs ── */
.mode-tabs {
  display: flex;
  gap: .5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: .75rem;
  margin-bottom: .25rem;
}

.tab-btn {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: .8rem;
  font-weight: 600;
  padding: .35rem .9rem;
  transition: var(--transition);
}

.tab-btn:hover {
  color: var(--text-color);
  border-color: var(--primary-color);
  background: var(--background-hover);
}
.tab-btn.active {
  background: var(--accent-dim);
  border-color: var(--primary-color);
  color: var(--primary-hi);
}

/* ── Tab panels ── */
.tab-panel {
  background: var(--card-bg-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
}

/* ── Controls / form ── */
.controls { display: flex; flex-direction: column; gap: .875rem; }

.controls label {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  font-size: .75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: .06em;
}

.controls label small { text-transform: none; font-weight: 400; color: var(--text-tertiary); }

.controls input,
.controls textarea {
  background: var(--input-bg-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-color);
  font-size: .88rem;
  font-family: inherit;
  padding: .5rem .75rem;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
  resize: vertical;
}

.controls input:focus,
.controls textarea:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), .2);
}

.controls-row {
  display: flex;
  gap: .75rem;
  align-items: flex-end;
  flex-wrap: wrap;
}
.controls-row label { flex: 1; }

/* ── Chip category input ── */
.control-group { display: flex; flex-direction: column; gap: .3rem; }

.control-label {
  font-size: .75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: .06em;
}

.chip-input-wrap {
  background: var(--input-bg-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  padding: .4rem .6rem;
  cursor: text;
  transition: border-color .15s, box-shadow .15s;
  min-height: 40px;
  align-items: center;
}

.chip-input-wrap:focus-within {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), .2);
}

.chips { display: contents; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  background: var(--tag-bg);
  border: 1px solid var(--border-accent);
  border-radius: 4px;
  color: var(--primary-hi);
  font-size: .72rem;
  font-family: var(--mono);
  font-weight: 600;
  padding: .15rem .5rem;
}

.chip-remove {
  background: none;
  border: none;
  color: var(--primary-hi);
  cursor: pointer;
  font-size: .85rem;
  line-height: 1;
  padding: 0;
  opacity: .6;
  transition: var(--transition);
}
.chip-remove:hover { opacity: 1; color: var(--red-color); }

#categoryTyping {
  background: none;
  border: none;
  color: var(--text-color);
  font-size: .88rem;
  font-family: inherit;
  outline: none;
  flex: 1;
  min-width: 120px;
  padding: 0;
}

.category-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  align-items: center;
  margin-top: .4rem;
}

.sugg-label {
  font-size: .68rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: .06em;
}

.sugg-chip {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: .7rem;
  font-family: var(--mono);
  padding: .15rem .5rem;
  transition: var(--transition);
}
.sugg-chip:hover, .sugg-chip.active {
  border-color: var(--primary-color);
  color: var(--primary-hi);
  background: var(--accent-dim);
}

/* ── Primary button ── */
.btn-primary {
  background: var(--gradient-primary);
  border: none;
  border-radius: var(--radius-sm);
  color: #fff;
  cursor: pointer;
  font-size: .85rem;
  font-weight: 700;
  padding: .55rem 1.4rem;
  transition: opacity .15s, transform .1s, box-shadow .15s;
  white-space: nowrap;
  align-self: flex-end;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover   { opacity: .88; transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-primary:active  { transform: translateY(0); box-shadow: var(--shadow-sm); }
.btn-primary:disabled { opacity: .45; cursor: not-allowed; transform: none; }

/* ── Status row ── */
.status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .5rem 0;
  margin-bottom: .5rem;
}

#statusText {
  font-size: .78rem;
  color: var(--text-secondary);
  font-family: var(--mono);
}

#summarizeAllBtn {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: .75rem;
  font-weight: 600;
  padding: .3rem .9rem;
  transition: var(--transition);
}
#summarizeAllBtn:not(:disabled):hover {
  border-color: var(--primary-color);
  color: var(--primary-hi);
  background: var(--accent-dim);
}
#summarizeAllBtn:disabled { opacity: .35; cursor: not-allowed; }

/* ── Paper list ── */
.paper-list { display: flex; flex-direction: column; gap: .75rem; }

/* ── Paper card ── */
.paper-card {
  background: var(--card-bg-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color .2s, box-shadow .2s;
  box-shadow: var(--shadow-sm);
}
.paper-card:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-md);
}

.paper-card > header {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.1rem 1.25rem .6rem;
}
.paper-card > header > div { flex: 1; }

.meta {
  font-size: .68rem;
  font-family: var(--mono);
  color: var(--text-tertiary);
  margin-bottom: .3rem;
}

.paper-card h2 {
  font-size: .95rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--text-primary);
}

.authors {
  padding: 0 1.25rem .5rem;
  font-size: .75rem;
  color: var(--text-secondary);
}

.abstract {
  padding: 0 1.25rem .75rem;
  font-size: .82rem;
  color: var(--text-secondary);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  cursor: pointer;
  transition: color .15s;
}
.abstract.expanded { -webkit-line-clamp: unset; }
.abstract:hover { color: var(--text-color); }

.paper-links {
  display: flex;
  gap: .5rem;
  padding: 0 1.25rem .85rem;
}

.paper-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: .75rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: .2rem .7rem;
  transition: var(--transition);
}
.paper-links a:hover {
  color: var(--text-color);
  border-color: var(--text-secondary);
  background: var(--background-hover);
}

/* ── Summarize button (in card) ── */
.summarize-btn {
  background: none;
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
  color: var(--primary-hi);
  cursor: pointer;
  font-size: .73rem;
  font-weight: 700;
  padding: .3rem .8rem;
  white-space: nowrap;
  flex-shrink: 0;
  transition: var(--transition);
}
.summarize-btn:hover {
  background: var(--accent-dim);
  border-color: var(--primary-hi);
  box-shadow: var(--shadow-sm);
}
.summarize-btn:disabled { opacity: .45; cursor: not-allowed; }
.summarize-btn.loading  { opacity: .7; }

/* ── AI panel ── */
.ai-panel {
  background: var(--background-light);
  border-top: 1px solid var(--border-color);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: .65rem;
}

.ai-panel > div {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: .5rem;
  align-items: start;
  opacity: 0;
  transform: translateY(4px);
  animation: fadeUp .25s ease forwards;
}

@keyframes fadeUp { to { opacity: 1; transform: translateY(0); } }

.ai-panel > div:nth-child(1) { animation-delay:   0ms; }
.ai-panel > div:nth-child(2) { animation-delay:  60ms; }
.ai-panel > div:nth-child(3) { animation-delay: 120ms; }
.ai-panel > div:nth-child(4) { animation-delay: 180ms; }
.ai-panel > div:nth-child(5) { animation-delay: 240ms; }

.ai-panel strong {
  font-size: .65rem;
  font-weight: 700;
  letter-spacing: .07em;
  text-transform: uppercase;
  padding-top: .15rem;
  display: block;
}

.ai-panel > div:nth-child(1) strong { color: var(--primary-hi); }
.ai-panel > div:nth-child(2) strong { color: var(--amber-color); }
.ai-panel > div:nth-child(3) strong { color: var(--secondary-color); }
.ai-panel > div:nth-child(4) strong { color: var(--green-color); }
.ai-panel > div:nth-child(5) strong { color: var(--text-secondary); }

.ai-panel p { font-size: .82rem; color: var(--text-color); line-height: 1.6; }

.ai-error {
  color: var(--red-color);
  font-size: .8rem;
  font-family: var(--mono);
}

/* ── Loading / empty ── */
.state-msg {
  text-align: center;
  padding: 3.5rem 1rem;
  color: var(--text-tertiary);
  font-size: .88rem;
}

.spinner {
  width: 32px; height: 32px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary-hi);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  margin: 0 auto .75rem;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Responsive ── */
@media (max-width: 560px) {
  .controls-row { flex-direction: column; }
  .btn-primary { width: 100%; text-align: center; }
  .ai-panel > div { grid-template-columns: 1fr; }
}