:root {
  /* Brand — from the Trinity leaf logo */
  --brand-green:      #05800E; /* primary: buttons, header, active — white text OK (5.1:1) */
  --brand-green-dark: #006A08; /* hover / pressed — white text OK (6.9:1) */
  --brand-green-mid:  #298D0C; /* accents / large headings only — NOT body text */
  --brand-lime:       #8CB006; /* decorative accent — never behind text */
  --brand-gold:       #DFCD08; /* decorative accent — never behind text */
  --brand-gradient: linear-gradient(115deg, #05800E 0%, #8CB006 55%, #DFCD08 100%);

  /* Neutrals */
  --bg:           #F7F9F4;
  --surface:      #FFFFFF;
  --surface-tint: #EEF4E6;
  --border:       #DDE6D3;

  /* Text */
  --text:       #20271E;
  --text-muted: #5E6B58;
  --link:       #1C7A0B;
  --link-hover: #006A08;

  --danger:     #B3261E;

  --radius: 12px;
  --shadow:    0 1px 3px rgba(15, 35, 10, 0.04), 0 6px 24px rgba(15, 35, 10, 0.06);
  --shadow-sm: 0 1px 2px rgba(15, 35, 10, 0.06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ========== Landing page ========== */

.page {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 0 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Hero header bar */
.page__hero {
  position: relative;
  background: var(--brand-green);
  color: #fff;
  border-radius: 0 0 16px 16px;
  box-shadow: var(--shadow);
  margin-bottom: 0.25rem;
}
.page__hero-accent {
  height: 5px;
  background: var(--brand-gradient);
  border-radius: 16px 16px 0 0;
}
.page__hero-inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.4rem;
}
.page__logo {
  flex: 0 0 auto;
  width: 64px;
  height: 64px;
  object-fit: contain;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 6px;
}
.page__title-block { min-width: 0; }
.page__title {
  margin: 0;
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.15;
  color: #fff;
}
.page__subtitle {
  margin: 0.2rem 0 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: 0.95rem;
}

/* Card sections */
.page__section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.15rem 1.3rem;
  margin: 0 1rem;
}
.page__section-title {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}
.page__section-note {
  margin: 0 0 0.85rem;
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* Downloads */
.page__download-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}
.download-btn {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-decoration: none;
  color: var(--text);
  transition: border-color 120ms ease, background 120ms ease, transform 120ms ease;
}
.download-btn:hover {
  border-color: var(--brand-green);
  background: var(--surface-tint);
}
.download-btn:active { transform: translateY(1px); }
.download-btn__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px; height: 38px;
  border-radius: 9px;
  background: var(--brand-green);
  color: #fff;
  font-size: 1.15rem;
  flex: 0 0 auto;
  transition: background 120ms ease;
}
.download-btn:hover .download-btn__icon { background: var(--brand-green-dark); }
.download-btn__label { display: flex; flex-direction: column; line-height: 1.25; min-width: 0; }
.download-btn__label strong { font-size: 0.96rem; }
.download-btn__label small { font-size: 0.78rem; color: var(--text-muted); }

/* Chat inside landing card */
.page__chat-wrap { padding: 0.85rem; }
.page__chat-wrap .chat { padding: 0; gap: 0.65rem; }
.page__chat-wrap .chat__messages { min-height: 360px; }

/* AI info card */
.page__info p {
  margin: 0.55rem 0;
  font-size: 0.95rem;
}
.page__info a { color: var(--link); text-decoration: underline; text-underline-offset: 2px; }
.page__info a:hover { color: var(--link-hover); }

.page__footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  padding: 0.25rem 1rem;
  font-style: italic;
}

/* ========== Embed mode ========== */

.embed-body { background: transparent; }
.embed {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 760px;
  margin: 0 auto;
  padding: 0.5rem;
  gap: 0.5rem;
}
.embed .chat { flex: 1; padding: 0; gap: 0.5rem; }
.embed .chat__messages { flex: 1; min-height: 0; }
.embed__disclaimer {
  margin: 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-style: italic;
}

/* ========== Chat (shared) ========== */

.chat {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.chat__messages {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  overflow-y: auto;
  /* Disable browser scroll anchoring: when bubble innerHTML is replaced
     each reveal tick, anchor jumps can pull the reader around. */
  overflow-anchor: none;
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-height: 320px;
}

.chat__intro {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin: auto 0;
  text-align: center;
  padding: 1rem;
}
.chat__intro p { margin: 0 0 0.5rem; }
.chat__intro-examples { font-size: 0.875rem; }
.chat__intro em { color: var(--text); font-style: italic; }

.bubble {
  max-width: 85%;
  padding: 0.7rem 0.95rem;
  border-radius: var(--radius);
  white-space: pre-wrap;
  word-wrap: break-word;
  line-height: 1.5;
  font-size: 0.95rem;
  animation: bubbleIn 180ms ease-out;
}
@keyframes bubbleIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.bubble--user {
  align-self: flex-end;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-bottom-right-radius: 4px;
}
.bubble--assistant {
  align-self: flex-start;
  background: var(--surface-tint);
  color: var(--text);
  border-bottom-left-radius: 4px;
}
.bubble--error {
  background: #FDECEA;
  color: var(--danger);
  border: 1px solid #F5C6C2;
}

/* Markdown inside assistant bubbles */
.bubble--markdown { max-width: 92%; white-space: normal; }
.bubble--markdown > *:first-child { margin-top: 0; }
.bubble--markdown > *:last-child  { margin-bottom: 0; }

.bubble--markdown h1,
.bubble--markdown h2,
.bubble--markdown h3,
.bubble--markdown h4 {
  margin: 0.9rem 0 0.4rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text);
}
.bubble--markdown h1 { font-size: 1.18rem; color: var(--brand-green-mid); }
.bubble--markdown h2 { font-size: 1.06rem; color: var(--brand-green-mid); }
.bubble--markdown h3 { font-size: 0.98rem; }
.bubble--markdown h4 { font-size: 0.95rem; color: var(--text-muted); }
.bubble--markdown p { margin: 0.45rem 0; }
.bubble--markdown ul,
.bubble--markdown ol { margin: 0.45rem 0; padding-left: 1.4rem; }
.bubble--markdown li { margin: 0.2rem 0; }
.bubble--markdown li > p { margin: 0.15rem 0; }
.bubble--markdown strong { font-weight: 700; }
.bubble--markdown em { font-style: italic; }
.bubble--markdown a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.bubble--markdown a:hover { color: var(--link-hover); }
.bubble--markdown blockquote {
  margin: 0.6rem 0;
  padding: 0.5rem 0.95rem;
  border-left: 3px solid var(--brand-green);
  background: rgba(5, 128, 14, 0.06);
  color: var(--text);
  border-radius: 0 6px 6px 0;
  font-style: italic;
}
.bubble--markdown blockquote p { margin: 0.15rem 0; }
.bubble--markdown code {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1px 5px;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
}
.bubble--markdown pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.65rem 0.8rem;
  overflow-x: auto;
  margin: 0.5rem 0;
}
.bubble--markdown pre code {
  background: transparent;
  border: 0;
  padding: 0;
  border-radius: 0;
  font-size: 0.85rem;
}
.bubble--markdown table {
  border-collapse: collapse;
  margin: 0.6rem 0;
  font-size: 0.9rem;
  width: 100%;
  display: block;
  overflow-x: auto;
}
.bubble--markdown th,
.bubble--markdown td {
  border: 1px solid var(--border);
  padding: 0.4rem 0.6rem;
  text-align: left;
  vertical-align: top;
}
.bubble--markdown th {
  background: var(--surface-tint);
  font-weight: 700;
  color: var(--text);
}
.bubble--markdown hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 0.9rem 0;
}

/* Thinking-dots indicator */
.bubble--thinking {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0.9rem 1rem;
  min-width: 60px;
}
.bubble--thinking::before,
.bubble--thinking::after,
.bubble--thinking span {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand-green-mid);
  opacity: 0.4;
  animation: dotPulse 1.2s infinite ease-in-out;
}
.bubble--thinking span { animation-delay: 0.15s; }
.bubble--thinking::after { animation-delay: 0.3s; }
@keyframes dotPulse {
  0%, 80%, 100% { opacity: 0.3; transform: scale(0.85); }
  40%            { opacity: 1;   transform: scale(1); }
}

/* Input form */
.chat__form {
  display: flex;
  gap: 0.5rem;
  align-items: flex-end;
  background: var(--surface);
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.chat__form textarea {
  flex: 1;
  padding: 0.65rem 0.75rem;
  border: 0;
  background: transparent;
  resize: none;
  font: inherit;
  color: var(--text);
  min-height: 2.5rem;
  max-height: 12rem;
}
.chat__form textarea::placeholder { color: var(--text-muted); }
.chat__form textarea:focus { outline: none; }

.chat__send {
  padding: 0.65rem 1.15rem;
  background: var(--brand-green);
  color: #fff;
  border: 0;
  border-radius: 8px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background 120ms ease, transform 120ms ease;
}
.chat__send:hover:not(:disabled) { background: var(--brand-green-dark); }
.chat__send:active:not(:disabled) { transform: translateY(1px); }
.chat__send:disabled,
.chat__form textarea:disabled { opacity: 0.5; cursor: not-allowed; }

.chat__noscript {
  margin: 0;
  padding: 0.75rem 1rem;
  background: #FDECEA;
  color: var(--danger);
  border-radius: 8px;
  text-align: center;
}

/* ========== Mobile ========== */

@media (max-width: 640px) {
  .page { gap: 0.75rem; padding: 0 0 1.25rem; }
  .page__hero-inner { padding: 1rem 1.1rem; gap: 0.85rem; }
  .page__logo { width: 52px; height: 52px; border-radius: 10px; }
  .page__title { font-size: 1.3rem; }
  .page__subtitle { font-size: 0.88rem; }
  .page__section { margin: 0 0.75rem; padding: 0.95rem 1.05rem; }
  .page__download-row { grid-template-columns: 1fr; gap: 0.5rem; }
  .page__chat-wrap .chat__messages { min-height: 300px; }
  .bubble { max-width: 92%; font-size: 0.93rem; }
  .download-btn { padding: 0.75rem 0.85rem; }
  .download-btn__icon { width: 34px; height: 34px; font-size: 1rem; }
}

@media (max-width: 420px) {
  .page__hero-inner { flex-direction: column; text-align: left; align-items: flex-start; }
  .page__title { font-size: 1.2rem; }
}