src/style.css

@tailwind base;
@tailwind components;
@tailwind utilities;

/* ── Color tokens ── */
:root {
  /* Light theme (default) */
  --c-bg:        #f5f6f8;
  --c-sf:        #ecedf1;
  --c-card:      #ffffff;
  --c-top:       #f8fbff;
  --c-top-bd:    rgba(148,163,184,0.18);
  --c-top-el:    rgba(255,255,255,0.76);
  --c-top-el-h:  #ffffff;
  --c-side:      #f1f5fb;
  --c-side-bd:   rgba(148,163,184,0.22);
  --c-side-el:   rgba(255,255,255,0.72);
  --c-side-el-h: rgba(255,255,255,0.92);
  --c-side-act:  #ffffff;
  --c-side-act-bd: rgba(96,165,250,0.22);
  --c-side-tx:   #334155;
  --c-side-tx2:  rgba(51,65,85,0.78);
  --c-side-tx3:  rgba(51,65,85,0.52);
  --c-bd:        rgba(0,0,0,0.09);
  --c-bd-hi:     rgba(0,0,0,0.22);
  --c-tx:        #121212;
  --c-tx2:       #3d3d3d;
  --c-tx3:       rgba(0,0,0,0.38);
  --c-txph:      rgba(0,0,0,0.32);
  --c-hi:        rgba(0,0,0,0.08);
  --c-ho:        rgba(0,0,0,0.04);
  --c-ub:        #dbeafe;
  --c-ub-bd:     #bfdbfe;
  --c-utx:       #1d4ed8;
  --c-code:      rgba(0,0,0,0.06);
  --c-scrl:      rgba(0,0,0,0.15);
  --c-scrl-hv:   rgba(0,0,0,0.28);
  --c-prose:     #2d2d2d;
  --c-prose-h:   #0f0f0f;
  --c-prose-a:   #2563eb;
  --c-prose-ah:  #1d4ed8;
  --c-prose-cd:  #1a3a72;
}

.dark {
  --c-bg:        #0b0b0b;
  --c-sf:        #0a0a0a;
  --c-card:      #141414;
  --c-top:       #10161f;
  --c-top-bd:    rgba(148,163,184,0.14);
  --c-top-el:    rgba(255,255,255,0.06);
  --c-top-el-h:  rgba(255,255,255,0.10);
  --c-side:      #131922;
  --c-side-bd:   rgba(148,163,184,0.16);
  --c-side-el:   rgba(255,255,255,0.05);
  --c-side-el-h: rgba(255,255,255,0.08);
  --c-side-act:  rgba(59,130,246,0.16);
  --c-side-act-bd: rgba(96,165,250,0.24);
  --c-side-tx:   #e5ecf6;
  --c-side-tx2:  rgba(226,232,240,0.78);
  --c-side-tx3:  rgba(226,232,240,0.48);
  --c-bd:        rgba(255,255,255,0.07);
  --c-bd-hi:     rgba(255,255,255,0.18);
  --c-tx:        #e2e2e2;
  --c-tx2:       rgba(255,255,255,0.75);
  --c-tx3:       rgba(255,255,255,0.28);
  --c-txph:      rgba(255,255,255,0.22);
  --c-hi:        rgba(255,255,255,0.07);
  --c-ho:        rgba(255,255,255,0.04);
  --c-ub:        rgba(79,142,247,0.13);
  --c-ub-bd:     rgba(79,142,247,0.22);
  --c-utx:       rgba(255,255,255,0.90);
  --c-code:      #0e0e0e;
  --c-scrl:      rgba(255,255,255,0.12);
  --c-scrl-hv:   rgba(255,255,255,0.22);
  --c-prose:     #d8d8d8;
  --c-prose-h:   #ffffff;
  --c-prose-a:   #7dd3fc;
  --c-prose-ah:  #bae6fd;
  --c-prose-cd:  #e2e8f0;
}

* {
  box-sizing: border-box;
}

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

body {
  background: var(--c-bg);
  color: var(--c-tx);
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 5px;
  height: 5px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--c-scrl);
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--c-scrl-hv);
}

/* User message bubble */
.user-bubble {
  background: var(--c-ub);
  border: 1px solid var(--c-ub-bd);
  border-radius: 18px;
}

/* Prose — markdown content */
.prose-dark {
  color: var(--c-prose);
  line-height: 1.75;
  word-break: break-word;
}
.prose-dark h1,
.prose-dark h2,
.prose-dark h3,
.prose-dark h4 {
  color: var(--c-prose-h);
  font-weight: 600;
  margin: 1em 0 0.5em;
  line-height: 1.3;
}
.prose-dark h1 { font-size: 1.5em; }
.prose-dark h2 { font-size: 1.25em; }
.prose-dark h3 { font-size: 1.1em; }
.prose-dark p {
  margin: 0.6em 0;
}
.prose-dark p:first-child { margin-top: 0; }
.prose-dark p:last-child { margin-bottom: 0; }
.prose-dark a {
  color: var(--c-prose-a);
  text-decoration: underline;
}
.prose-dark a:hover {
  color: var(--c-prose-ah);
}
.prose-dark ul,
.prose-dark ol {
  padding-left: 1.5em;
  margin: 0.5em 0;
}
.prose-dark li {
  margin: 0.2em 0;
}
.prose-dark blockquote {
  border-left: 3px solid var(--c-bd);
  padding-left: 1em;
  color: var(--c-tx3);
  margin: 0.75em 0;
  font-style: italic;
}
.prose-dark hr {
  border: none;
  border-top: 1px solid var(--c-bd);
  margin: 1em 0;
}
.prose-dark table {
  border-collapse: collapse;
  width: 100%;
  margin: 0.75em 0;
  font-size: 0.9em;
}
.prose-dark th,
.prose-dark td {
  border: 1px solid var(--c-bd);
  padding: 0.4em 0.75em;
  text-align: left;
}
.prose-dark th {
  background: var(--c-hi);
  font-weight: 600;
}
.prose-dark code:not(pre code) {
  background: var(--c-code);
  border: 1px solid var(--c-bd);
  border-radius: 3px;
  padding: 0.1em 0.35em;
  font-size: 0.875em;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  color: var(--c-prose-cd);
}
.prose-dark pre {
  background: var(--c-code);
  border: 1px solid var(--c-bd);
  border-radius: 6px;
  padding: 1em;
  overflow-x: auto;
  margin: 0.75em 0;
  position: relative;
}
.prose-dark pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.85em;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  color: var(--c-prose-cd);
}

/* Code block copy button */
.code-block-wrapper {
  position: relative;
}
.copy-btn {
  position: absolute;
  top: 0.5em;
  right: 0.5em;
  background: var(--c-hi);
  border: 1px solid var(--c-bd);
  border-radius: 6px;
  color: var(--c-tx3);
  font-size: 0.7em;
  padding: 2px 8px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s ease;
}
.code-block-wrapper:hover .copy-btn {
  opacity: 1;
}
.copy-btn:hover {
  background: var(--c-ho);
  color: var(--c-tx);
}

/* Message fade-in animation */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.message-enter {
  animation: fadeInUp 0.2s ease forwards;
}

/* Typing indicator */
@keyframes typingDot {
  0%, 60%, 100% { opacity: 0.2; transform: translateY(0); }
  30% { opacity: 1; transform: translateY(-4px); }
}
.typing-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-tx3);
  animation: typingDot 1.2s infinite;
}
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

/* Sidebar transition */
.sidebar-transition {
  transition: transform 0.25s ease, opacity 0.25s ease;
}

/* Input textarea auto-resize */
textarea {
  resize: none;
  overflow-y: auto;
}

/* Dropdown */
.dropdown-enter {
  animation: dropdownFade 0.15s ease forwards;
}
@keyframes dropdownFade {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Modal */
.modal-backdrop {
  animation: modalFadeIn 0.15s ease forwards;
}
@keyframes modalFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
.modal-panel {
  animation: modalSlideIn 0.2s ease forwards;
}
@keyframes modalSlideIn {
  from { opacity: 0; transform: scale(0.96) translateY(-8px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

/* hljs theme overrides */
.hljs {
  background: transparent !important;
}