style.css

:root {
  --bg: #0e1116;
  --bg-soft: #161b22;
  --fg: #e6edf3;
  --fg-dim: #9aa6b2;
  --accent: #7ee787;
  --accent-2: #79c0ff;
  --rule: #21262d;
  --code-bg: #1b2129;
  /* contrast color that sits on top of the bright accent (button text, badges) */
  --on-accent: #0e1116;
  /* faint overlay used for subtle hover fills */
  --overlay: rgba(255, 255, 255, 0.04);
  --danger: #ff8a80;
  /* WeChat badge on the post list */
  --wechat: #52d17f;
  --wechat-soft: rgba(82, 209, 127, 0.10);
  --wechat-line: rgba(82, 209, 127, 0.38);
  --shadow-strong: 0 24px 60px rgba(0, 0, 0, 0.55), 0 6px 14px rgba(0, 0, 0, 0.35);
  --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.45);
  --serif: ui-serif, Georgia, "Times New Roman", serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Helvetica, Arial, sans-serif;
}

/* ---------- Daytime (light) theme — warm beige / 米黄色 paper ---------- */
:root[data-theme="light"] {
  --bg: #f5edda;          /* 米黄色 — warm cream paper */
  --bg-soft: #efe5cd;     /* cards & panels, a shade deeper */
  --fg: #353026;          /* warm ink, near-black */
  --fg-dim: #7c715a;      /* muted sepia */
  --accent: #2f8f57;      /* leaf green */
  --accent-2: #2f6db0;    /* ink blue */
  --rule: #e2d6ba;        /* soft tan rule */
  --code-bg: #ece1c6;     /* parchment code block */
  --on-accent: #fffaf0;   /* light text on the green/blue accents */
  --overlay: rgba(91, 74, 38, 0.06);
  --danger: #c0392b;
  --wechat: #1a9e52;
  --wechat-soft: rgba(26, 158, 82, 0.10);
  --wechat-line: rgba(26, 158, 82, 0.35);
  --shadow-strong: 0 20px 48px rgba(120, 96, 50, 0.22), 0 5px 12px rgba(120, 96, 50, 0.16);
  --shadow-soft: 0 8px 22px rgba(120, 96, 50, 0.18);
  color-scheme: light;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* ---------- Theme toggle button (top-right, all pages) ---------- */
.theme-toggle {
  position: fixed;
  top: 1.1rem;
  right: 1.1rem;
  z-index: 1100;
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  background: var(--bg-soft);
  color: var(--fg-dim);
  border: 1px solid var(--rule);
  border-radius: 999px;
  cursor: pointer;
  box-shadow: var(--shadow-soft);
  transition: color 0.18s ease, border-color 0.18s ease, transform 0.18s ease, background 0.18s ease;
}
.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px) rotate(-8deg);
}
.theme-toggle:active { transform: translateY(0) scale(0.94); }
.theme-toggle svg { display: block; }
/* show the sun in dark mode (click → go light), the moon in light mode */
.theme-toggle .icon-moon { display: none; }
.theme-toggle .icon-sun { display: block; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: block; }

a {
  color: var(--accent-2);
  text-decoration: none;
  border-bottom: 1px dotted rgba(121, 192, 255, 0.4);
}
a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.wrap {
  max-width: 888px;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}
.wrap.post { max-width: 960px; }

/* Hero */
.hero { margin-bottom: 3rem; }
.banner {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 0.78rem;
  line-height: 1.05;
  white-space: pre;
  overflow-x: auto;
  margin: 0 0 1rem;
  opacity: 0.9;
}
.hero h1 {
  font-size: 2.4rem;
  margin: 0.2rem 0 0.3rem;
  letter-spacing: -0.02em;
}
.hero .tagline {
  margin: 0 0 0.6rem;
  color: var(--fg-dim);
  font-family: var(--mono);
  font-size: 0.95rem;
}
.hero .links a {
  font-family: var(--mono);
  font-size: 0.92rem;
}

/* Sections */
section { margin: 2.6rem 0; }
section h2 {
  font-size: 1.15rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--fg-dim);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.4rem;
  margin: 0 0 1.2rem;
}

/* Projects */
.project-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1.1rem;
}
.project-list li {
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  transition: border-color 0.15s ease;
}
.project-list li:hover { border-color: var(--accent); }
.project-list li a {
  font-family: var(--mono);
  font-size: 1rem;
  border-bottom: none;
}
.project-list li code {
  background: transparent;
  padding: 0;
  color: var(--accent);
}
.project-list li p {
  margin: 0.35rem 0 0;
  color: var(--fg-dim);
  font-size: 0.95rem;
}

/* Posts list */
.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.post-list li {
  padding: 0.45rem 0;
  border-bottom: 1px dashed var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: baseline;
}
.post-list li:last-child { border-bottom: none; }
.post-date {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--fg-dim);
  min-width: 6.5rem;
}
.post-summary {
  color: var(--fg-dim);
  font-size: 0.92rem;
}
/* "微信" badge linking a post to its 公众号 version */
.post-wechat {
  margin-left: auto;
  flex: none;
  font-family: var(--mono);
  font-size: 0.72rem;
  line-height: 1;
  letter-spacing: 0.02em;
  padding: 0.28em 0.6em;
  border: 1px solid var(--wechat-line);
  border-radius: 999px;
  color: var(--wechat);
  background: var(--wechat-soft);
  white-space: nowrap;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}
.post-wechat:hover,
.post-wechat:focus-visible {
  color: var(--on-accent);
  background: var(--wechat);
  border-color: var(--wechat);
  text-decoration: none;
}
.empty {
  color: var(--fg-dim);
  font-style: italic;
}

/* Post page */
.topnav {
  font-family: var(--mono);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}
.post-header h1 {
  font-size: 2rem;
  margin: 0 0 0.3rem;
  letter-spacing: -0.01em;
}
.post-header .meta {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--fg-dim);
  margin: 0 0 2rem;
}

.content h1, .content h2, .content h3, .content h4 {
  margin: 1.6em 0 0.6em;
  letter-spacing: -0.01em;
}
.content h2 {
  font-size: 1.4rem;
  border: none;
  text-transform: none;
  color: var(--fg);
  letter-spacing: -0.01em;
  padding: 0;
}
.content h3 { font-size: 1.15rem; }
.content p { margin: 0.9em 0; }
.content ul, .content ol { padding-left: 1.4em; }
.content blockquote {
  border-left: 3px solid var(--accent);
  margin: 1em 0;
  padding: 0.2em 1em;
  color: var(--fg-dim);
  background: var(--bg-soft);
  border-radius: 0 6px 6px 0;
}
.content code {
  background: var(--code-bg);
  font-family: var(--mono);
  font-size: 0.9em;
  padding: 0.12em 0.4em;
  border-radius: 4px;
  color: var(--accent);
}
.content pre {
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.55;
}
.content pre code {
  background: transparent;
  padding: 0;
  color: var(--fg);
  font-size: inherit;
}
.content table {
  border-collapse: collapse;
  width: 100%;
  margin: 1em 0;
  font-size: 0.92rem;
}
.content th, .content td {
  border: 1px solid var(--rule);
  padding: 0.5em 0.8em;
  text-align: left;
}
.content th { background: var(--bg-soft); }
.content img { max-width: 100%; border-radius: 6px; }
.content hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 2em 0;
}

/* Floating Ask-AI chat widget */
.ai-fab {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 1000;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.1rem 0.7rem 0.9rem;
  background: linear-gradient(135deg, #7ee787 0%, #79c0ff 100%);
  color: #0e1116;
  border: none;
  border-radius: 999px;
  font-family: var(--sans);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45), 0 2px 6px rgba(126, 231, 135, 0.25);
  transition: transform 0.18s ease, box-shadow 0.18s ease, opacity 0.18s ease;
}
.ai-fab:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.55), 0 4px 10px rgba(126, 231, 135, 0.35);
}
.ai-fab:active { transform: translateY(0); }
.ai-fab svg { display: block; }
.ai-fab-label { line-height: 1; }
.ai-fab.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px) scale(0.95);
}

.ai-panel {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 1001;
  width: min(380px, calc(100vw - 2rem));
  height: min(560px, calc(100vh - 3rem));
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 14px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.55), 0 6px 14px rgba(0, 0, 0, 0.35);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  opacity: 0;
  transform: translateY(16px) scale(0.97);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.22s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.ai-panel.open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.ai-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.75rem 0.9rem;
  border-bottom: 1px solid var(--rule);
  background: linear-gradient(180deg, rgba(126, 231, 135, 0.08), transparent);
}
.ai-panel-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  min-width: 0;
}
.ai-panel-head h3 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--fg);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.ai-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 rgba(126, 231, 135, 0.6);
  animation: ai-pulse 2s infinite;
  flex-shrink: 0;
}
@keyframes ai-pulse {
  0% { box-shadow: 0 0 0 0 rgba(126, 231, 135, 0.55); }
  70% { box-shadow: 0 0 0 8px rgba(126, 231, 135, 0); }
  100% { box-shadow: 0 0 0 0 rgba(126, 231, 135, 0); }
}
.ai-panel-actions { display: flex; gap: 0.25rem; }
.ai-icon-btn {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  color: var(--fg-dim);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.ai-icon-btn:hover {
  color: var(--fg);
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--rule);
}

.ai-messages {
  flex: 1;
  overflow-y: auto;
  padding: 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  scroll-behavior: smooth;
}
.ai-messages::-webkit-scrollbar { width: 8px; }
.ai-messages::-webkit-scrollbar-thumb { background: var(--rule); border-radius: 4px; }
.ai-messages::-webkit-scrollbar-thumb:hover { background: #2d343d; }

.ai-empty {
  margin: auto 0;
  text-align: center;
  color: var(--fg-dim);
  padding: 1rem;
}
.ai-empty-title {
  margin: 0 0 0.3rem;
  color: var(--fg);
  font-family: var(--mono);
  font-size: 0.88rem;
  letter-spacing: 0.04em;
}
.ai-empty-sub {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.55;
}

.ai-msg {
  display: flex;
  max-width: 100%;
}
.ai-msg-user { justify-content: flex-end; }
.ai-msg-assistant, .ai-msg-error { justify-content: flex-start; }

.ai-bubble {
  max-width: 85%;
  padding: 0.55rem 0.8rem;
  border-radius: 12px;
  font-size: 0.92rem;
  line-height: 1.55;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-wrap: anywhere;
}
.ai-msg-user .ai-bubble {
  background: linear-gradient(135deg, rgba(121, 192, 255, 0.18), rgba(121, 192, 255, 0.10));
  color: var(--fg);
  border: 1px solid rgba(121, 192, 255, 0.25);
  border-bottom-right-radius: 4px;
}
.ai-msg-assistant .ai-bubble {
  background: rgba(126, 231, 135, 0.06);
  color: var(--fg);
  border: 1px solid rgba(126, 231, 135, 0.18);
  border-bottom-left-radius: 4px;
}
.ai-msg-error .ai-bubble {
  background: rgba(255, 138, 128, 0.08);
  color: #ff8a80;
  border: 1px solid rgba(255, 138, 128, 0.25);
}

.ai-dots { display: inline-flex; gap: 4px; padding: 2px 0; }
.ai-dots i {
  width: 6px;
  height: 6px;
  background: var(--fg-dim);
  border-radius: 50%;
  animation: ai-bounce 1.2s infinite ease-in-out;
}
.ai-dots i:nth-child(2) { animation-delay: 0.15s; }
.ai-dots i:nth-child(3) { animation-delay: 0.3s; }
@keyframes ai-bounce {
  0%, 80%, 100% { transform: translateY(0); opacity: 0.4; }
  40% { transform: translateY(-4px); opacity: 1; }
}

.ai-status {
  padding: 0.45rem 0.9rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--fg-dim);
  border-top: 1px solid var(--rule);
  background: rgba(255, 255, 255, 0.02);
}
.ai-status.info { color: var(--accent-2); }
.ai-status.bad { color: #ff8a80; }

.ai-composer {
  display: flex;
  align-items: flex-end;
  gap: 0.5rem;
  padding: 0.6rem 0.7rem 0.7rem;
  border-top: 1px solid var(--rule);
  background: var(--bg);
}
.ai-composer textarea {
  flex: 1;
  resize: none;
  min-height: 38px;
  max-height: 140px;
  padding: 0.55rem 0.7rem;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 8px;
  color: var(--fg);
  font-family: var(--sans);
  font-size: 0.92rem;
  line-height: 1.45;
  outline: none;
  transition: border-color 0.15s ease;
}
.ai-composer textarea:focus { border-color: var(--accent-2); }
.ai-composer textarea:disabled { opacity: 0.6; cursor: not-allowed; }

.ai-send {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: #0e1116;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease, opacity 0.15s ease;
}
.ai-send:hover:not(:disabled) { background: var(--accent-2); }
.ai-send:active:not(:disabled) { transform: scale(0.95); }
.ai-send:disabled { opacity: 0.4; cursor: not-allowed; }

@media (max-width: 600px) {
  .ai-fab { right: 1rem; bottom: 1rem; padding: 0.6rem 0.95rem 0.6rem 0.8rem; }
  .ai-panel {
    right: 0.75rem;
    left: 0.75rem;
    bottom: 0.75rem;
    width: auto;
    height: min(70vh, 560px);
  }
}

/* Pygments / codehilite minimal dark */
.highlight .k, .highlight .kd, .highlight .kn { color: #ff7b72; }
.highlight .s, .highlight .s1, .highlight .s2 { color: #a5d6ff; }
.highlight .c, .highlight .c1, .highlight .cm { color: #8b949e; font-style: italic; }
.highlight .n, .highlight .nx { color: var(--fg); }
.highlight .nf, .highlight .nc { color: var(--accent-2); }
.highlight .mi, .highlight .mf { color: #79c0ff; }
.highlight .o { color: #ff7b72; }

/* Pygments / codehilite — light (warm) overrides */
:root[data-theme="light"] .highlight .k,
:root[data-theme="light"] .highlight .kd,
:root[data-theme="light"] .highlight .kn,
:root[data-theme="light"] .highlight .o { color: #b3261e; }
:root[data-theme="light"] .highlight .s,
:root[data-theme="light"] .highlight .s1,
:root[data-theme="light"] .highlight .s2 { color: #0a7a4a; }
:root[data-theme="light"] .highlight .c,
:root[data-theme="light"] .highlight .c1,
:root[data-theme="light"] .highlight .cm { color: #9a8c6c; font-style: italic; }
:root[data-theme="light"] .highlight .nf,
:root[data-theme="light"] .highlight .nc,
:root[data-theme="light"] .highlight .mi,
:root[data-theme="light"] .highlight .mf { color: #2f6db0; }

/* ---------- Light-theme fixes for hardcoded dark-only colors ---------- */
:root[data-theme="light"] .ai-icon-btn:hover,
:root[data-theme="light"] .notes-icon-btn:hover,
:root[data-theme="light"] .ai-composer-close:hover,
:root[data-theme="light"] .notes-composer-close:hover { background: var(--overlay); }
:root[data-theme="light"] .ai-status { background: var(--overlay); }
:root[data-theme="light"] .ai-status.bad,
:root[data-theme="light"] .ai-msg-error .ai-bubble { color: var(--danger); }
:root[data-theme="light"] .ai-msg-error .ai-bubble { background: rgba(192, 57, 43, 0.07); border-color: rgba(192, 57, 43, 0.25); }
:root[data-theme="light"] .notes-toast.bad { color: var(--danger); border-color: var(--danger); }
:root[data-theme="light"] .notes-node { background: var(--overlay); }
:root[data-theme="light"] .ai-panel,
:root[data-theme="light"] .notes-panel,
:root[data-theme="light"] .notes-toolbar,
:root[data-theme="light"] .notes-composer { box-shadow: var(--shadow-strong); }
:root[data-theme="light"] .ai-fab,
:root[data-theme="light"] .notes-fab,
:root[data-theme="light"] .notes-toast { box-shadow: var(--shadow-soft); }
/* bright-gradient FAB / send / badges keep dark ink for legibility */
:root[data-theme="light"] .ai-fab,
:root[data-theme="light"] .ai-send,
:root[data-theme="light"] .notes-count,
:root[data-theme="light"] .notes-btn-primary { color: #10240f; }

/* Footer */
footer {
  margin-top: 4rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--rule);
  color: var(--fg-dim);
  font-size: 0.85rem;
  font-family: var(--mono);
}

@media (max-width: 600px) {
  .hero h1 { font-size: 1.9rem; }
  .banner { font-size: 0.6rem; }
  .post-list li { flex-direction: column; gap: 0.1rem; }
  .post-date { min-width: 0; }
  /* stacked layout: keep the badge under the title, not floated to the edge */
  .post-wechat { margin-left: 0; align-self: flex-start; margin-top: 0.25rem; }
}

/* ---------- Outline notes / comments ---------- */
.notes-fab {
  position: fixed;
  left: 1.5rem;
  bottom: 1.5rem;
  z-index: 1000;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1rem 0.65rem 0.85rem;
  background: var(--bg-soft);
  color: var(--fg);
  border: 1px solid var(--rule);
  border-radius: 999px;
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  transition: transform 0.18s ease, box-shadow 0.18s ease, opacity 0.18s ease, border-color 0.18s ease;
}
.notes-fab:hover {
  transform: translateY(-2px);
  border-color: var(--accent-2);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.55);
}
.notes-fab:active { transform: translateY(0); }
.notes-fab svg { display: block; }
.notes-fab.hidden { opacity: 0; pointer-events: none; transform: translateY(8px) scale(0.95); }
.notes-count {
  background: var(--accent-2);
  color: #0e1116;
  padding: 0.05em 0.5em;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.4;
}

.notes-panel {
  position: fixed;
  left: 1.5rem;
  bottom: 1.5rem;
  z-index: 1001;
  width: min(420px, calc(100vw - 2rem));
  height: min(600px, calc(100vh - 3rem));
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 14px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.55), 0 6px 14px rgba(0, 0, 0, 0.35);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  opacity: 0;
  transform: translateY(16px) scale(0.97);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.22s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.notes-panel.open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}
.notes-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--rule);
  background: linear-gradient(180deg, rgba(121, 192, 255, 0.08), transparent);
}
.notes-panel-title-wrap { display: flex; align-items: center; gap: 0.5rem; min-width: 0; }
.notes-panel-head h3 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--fg);
}
.notes-icon { font-size: 0.95rem; }
.notes-panel-actions { display: flex; gap: 0.25rem; }
.notes-icon-btn {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  color: var(--fg-dim);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.notes-icon-btn:hover {
  color: var(--fg);
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--rule);
}

.notes-tree {
  flex: 1;
  overflow-y: auto;
  padding: 0.85rem;
}
.notes-tree::-webkit-scrollbar { width: 8px; }
.notes-tree::-webkit-scrollbar-thumb { background: var(--rule); border-radius: 4px; }
.notes-tree::-webkit-scrollbar-thumb:hover { background: #2d343d; }
.notes-empty {
  color: var(--fg-dim);
  font-style: italic;
  text-align: center;
  margin: 2rem 0.5rem;
  font-size: 0.9rem;
  line-height: 1.6;
}
.notes-empty b { font-style: normal; color: var(--accent); }

.notes-root-block {
  display: flex;
  flex-direction: column;
}
.notes-root-title {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--fg);
  padding: 0.35rem 0.5rem 0.5rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 0.3rem;
}
.notes-root-icon { font-size: 0.95rem; }
.notes-root-text {
  word-break: break-word;
}

.notes-children {
  list-style: none;
  padding: 0;
  margin: 0;
}
.notes-children.notes-root {
  padding-left: 0.6rem;
  border-left: 2px solid var(--accent);
  margin-left: 0.4rem;
}
.notes-children .notes-children {
  padding-left: 0.9rem;
  margin-top: 0.3rem;
  border-left: 1px solid var(--rule);
}
.notes-node {
  padding: 0.5rem 0.65rem;
  margin: 0.35rem 0;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--rule);
  border-radius: 8px;
  font-size: 0.88rem;
  line-height: 1.55;
  transition: border-color 0.15s ease;
}
.notes-node:hover { border-color: rgba(121, 192, 255, 0.35); }
.notes-quote {
  font-size: 0.78rem;
  color: var(--fg-dim);
  border-left: 2px solid var(--accent);
  padding: 0.05rem 0.55rem;
  margin-bottom: 0.4rem;
  font-style: italic;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  word-break: break-word;
}
.notes-text {
  color: var(--fg);
  white-space: pre-wrap;
  word-break: break-word;
}
.notes-actions {
  margin-top: 0.4rem;
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}
.notes-actions button {
  background: transparent;
  border: 1px solid var(--rule);
  color: var(--fg-dim);
  font-size: 0.74rem;
  padding: 0.18rem 0.55rem;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--sans);
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.notes-actions button:hover {
  color: var(--fg);
  border-color: var(--accent-2);
  background: rgba(121, 192, 255, 0.08);
}
.notes-actions button[data-act="delete"]:hover {
  color: #ff8a80;
  border-color: rgba(255, 138, 128, 0.45);
  background: rgba(255, 138, 128, 0.08);
}

.notes-toolbar {
  position: absolute;
  z-index: 1002;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 0.2rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.55);
}
.notes-tb-btn {
  background: transparent;
  border: none;
  color: var(--fg);
  padding: 0.35rem 0.7rem;
  cursor: pointer;
  font-family: var(--sans);
  font-size: 0.85rem;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.notes-tb-btn:hover {
  background: rgba(126, 231, 135, 0.12);
  color: var(--accent);
}

/* Inline composer: anchored below the user's selection so the article stays visible. */
.notes-composer {
  position: absolute;
  z-index: 2000;
  width: min(360px, calc(100vw - 24px));
  background: var(--bg-soft);
  border: 1px solid var(--accent-2);
  border-radius: 10px;
  padding: 0.55rem 0.6rem 0.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.55), 0 4px 10px rgba(121, 192, 255, 0.18);
}
.notes-composer[hidden] { display: none; }
.notes-composer-close {
  position: absolute;
  top: 0.35rem;
  right: 0.35rem;
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  color: var(--fg-dim);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.notes-composer-close:hover {
  color: var(--fg);
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--rule);
}
.notes-composer-quote {
  font-size: 0.78rem;
  color: var(--fg-dim);
  border-left: 2px solid var(--accent);
  padding: 0.2rem 1.8rem 0.2rem 0.55rem;
  background: rgba(255, 255, 255, 0.02);
  border-radius: 0 4px 4px 0;
  font-style: italic;
  max-height: 64px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
}
.notes-composer textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 6px;
  color: var(--fg);
  padding: 0.45rem 0.55rem;
  font-family: var(--sans);
  font-size: 0.9rem;
  line-height: 1.5;
  resize: vertical;
  outline: none;
  min-height: 60px;
  transition: border-color 0.15s ease;
}
.notes-composer textarea:focus { border-color: var(--accent-2); }
.notes-composer-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.4rem;
}

.notes-reply-composer {
  margin-top: 0.4rem;
  padding-top: 0.4rem;
  border-top: 1px dashed var(--rule);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.notes-reply-composer textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 6px;
  color: var(--fg);
  padding: 0.4rem 0.5rem;
  font-family: var(--sans);
  font-size: 0.86rem;
  line-height: 1.5;
  resize: vertical;
  outline: none;
  min-height: 50px;
  transition: border-color 0.15s ease;
}
.notes-reply-composer textarea:focus { border-color: var(--accent-2); }
.notes-btn-primary {
  background: var(--accent);
  color: #0e1116;
  border: none;
  padding: 0.45rem 1rem;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--sans);
  font-size: 0.9rem;
  transition: background 0.15s ease;
}
.notes-btn-primary:hover { background: var(--accent-2); }
.notes-btn-secondary {
  background: transparent;
  color: var(--fg-dim);
  border: 1px solid var(--rule);
  padding: 0.45rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--sans);
  font-size: 0.9rem;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.notes-btn-secondary:hover { color: var(--fg); border-color: var(--accent-2); }

.wechat-copy-btn {
  display: none;
}

.notes-toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--bg-soft);
  border: 1px solid var(--accent);
  color: var(--fg);
  padding: 0.5rem 1rem;
  border-radius: 999px;
  font-size: 0.85rem;
  z-index: 3000;
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}
.notes-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.notes-toast.bad { border-color: #ff8a80; color: #ff8a80; }

@media (max-width: 600px) {
  .notes-fab { left: 1rem; bottom: 1rem; padding: 0.55rem 0.9rem 0.55rem 0.75rem; }
  .notes-panel {
    left: 0.75rem;
    right: 0.75rem;
    bottom: 0.75rem;
    width: auto;
    height: min(70vh, 600px);
  }

  /* Mobile doesn't support on-device AI (Gemini Nano) — hide widget entirely. */
  .ai-fab, .ai-panel { display: none !important; }

  /* Inline composer becomes a bottom sheet so it never falls off-screen. */
  .notes-composer {
    position: fixed !important;
    top: auto !important;
    left: 0.5rem !important;
    right: 0.5rem !important;
    bottom: 0.5rem !important;
    width: auto !important;
    max-width: none !important;
  }
  .notes-composer-quote { max-height: 80px; }

  /* Selection toolbar: keep within viewport. */
  .notes-toolbar { max-width: calc(100vw - 16px); }

  /* Article page: tighter side padding and prevent long content from overflowing. */
  .wrap.post { padding-left: 1rem; padding-right: 1rem; }
  .post-header h1 { font-size: 1.55rem; word-break: break-word; }
  .content { word-wrap: break-word; overflow-wrap: anywhere; }
  .content pre { font-size: 0.78rem; padding: 0.7rem 0.8rem; }
  .content table { display: block; overflow-x: auto; max-width: 100%; }
  .content img { height: auto; }
}