/* =========================================================================
   notes.css — knowledge notes
   Depends on design.css (loaded first) for tokens, aurora, topnav,
   glass primitive, theme + i18n behavior. This file adds:
     - notes index (list page): toolbar, tag filters, note cards, empty state
     - note article (reading page): prose typography for hand-written HTML
   ========================================================================= */

/* ---------- Shared page shell ---------- */

.notes-page main,
.note-page main {
  display: block;
}

.page-hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(110px, 16vh, 170px) var(--pad-x) clamp(28px, 5vw, 48px);
}

.page-hero .eyebrow { margin-bottom: 18px; }

.page-hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  margin: 0 0 0.4em;
}

.page-hero .lede {
  color: var(--text-muted);
  max-width: 60ch;
  font-size: 1.02rem;
}

/* ---------- Notes toolbar (search + tag filters) ---------- */

.notes-toolbar {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 18px;
  margin-bottom: 28px;
}

.notes-search {
  position: relative;
  flex: 1 1 260px;
  max-width: 360px;
}
.notes-search i {
  position: absolute;
  left: 16px; top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  font-size: 0.9rem;
  pointer-events: none;
}
.notes-search input {
  width: 100%;
  padding: 12px 16px 12px 40px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.notes-search input:focus { border-color: var(--accent-2); background: var(--surface-strong); }

.tag-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.tag-filter {
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  cursor: pointer;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.tag-filter:hover { color: var(--text); border-color: var(--border-strong); }
.tag-filter.active {
  background: var(--accent-grad);
  color: #fff;
  border-color: transparent;
}

.notes-count {
  margin-left: auto;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}
@media (max-width: 640px) { .notes-count { margin-left: 0; width: 100%; } }

/* ---------- Notes grid ---------- */

.notes-grid {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad-x) clamp(60px, 10vh, 120px);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
@media (max-width: 980px) { .notes-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .notes-grid { grid-template-columns: 1fr; } }

.note-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 24px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: border-color var(--t-med) var(--ease), background var(--t-med) var(--ease), transform var(--t-med) var(--ease), box-shadow var(--t-med) var(--ease);
}
.note-card::after {
  content: "";
  position: absolute;
  inset-inline: 0; top: 0;
  height: 3px;
  background: var(--accent-grad);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-med) var(--ease);
}
.note-card:hover {
  border-color: var(--border-strong);
  background: var(--surface-strong);
  transform: translateY(-4px);
  box-shadow: 0 24px 50px -28px rgba(168, 85, 247, 0.6);
  color: inherit;
}
.note-card:hover::after { transform: scaleX(1); }

.note-card .note-date {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--accent-1);
  letter-spacing: 0.05em;
}
.note-card .note-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  margin: 10px 0 8px;
  line-height: 1.25;
}
.note-card .note-summary {
  color: var(--text-muted);
  font-size: 0.92rem;
  flex: 1;
  margin: 0 0 16px;
}
.note-card .note-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0; padding: 0;
}
.note-card .note-tags li {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 4px 9px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  color: var(--text);
}
.note-card .note-read {
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--accent-1);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.note-card .note-read .arrow { transition: transform var(--t-fast) var(--ease); }
.note-card:hover .note-read .arrow { transform: translateX(4px); }

/* Empty / loading state */
.notes-empty {
  max-width: var(--max);
  margin: 0 auto;
  padding: 60px var(--pad-x) 120px;
  text-align: center;
  color: var(--text-muted);
}
.notes-empty i { font-size: 2.4rem; color: var(--text-dim); margin-bottom: 16px; }

/* ---------- Note article (reading page) ---------- */

.note-article {
  max-width: 760px;
  margin: 0 auto;
  padding: clamp(100px, 14vh, 150px) var(--pad-x) clamp(60px, 10vh, 110px);
}

.note-article .note-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 26px;
}
.note-article .note-back:hover { color: var(--accent-1); }
.note-article .note-back .arrow { transition: transform var(--t-fast) var(--ease); }
.note-article .note-back:hover .arrow { transform: translateX(-4px); }

.note-article header.note-head {
  margin-bottom: 36px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--border);
}
.note-article .note-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-1);
  letter-spacing: 0.05em;
  margin-bottom: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  align-items: center;
}
.note-article .note-meta .tags { display: inline-flex; gap: 6px; flex-wrap: wrap; }
.note-article .note-meta .tags span {
  padding: 3px 8px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.72rem;
}
.note-article h1 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  margin: 0;
}

/* Prose: styles for hand-authored note body inside .prose */
.prose { color: var(--text); font-size: 1.05rem; line-height: 1.78; }
.prose > * + * { margin-top: 1.1em; }

.prose h2 {
  font-size: 1.6rem;
  margin-top: 2em;
  scroll-margin-top: 90px;
}
.prose h3 {
  font-size: 1.25rem;
  margin-top: 1.6em;
  scroll-margin-top: 90px;
}
.prose h2 + p, .prose h3 + p { margin-top: 0.6em; }

.prose a {
  color: var(--accent-1);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: color-mix(in srgb, var(--accent-1) 45%, transparent);
}
.prose a:hover { text-decoration-color: var(--accent-1); }

.prose strong { color: var(--text); font-weight: 600; }

.prose ul, .prose ol { padding-left: 1.4em; }
.prose li { margin-top: 0.4em; }
.prose li::marker { color: var(--accent-2); }

.prose blockquote {
  margin: 1.4em 0;
  padding: 4px 20px;
  border-left: 3px solid var(--accent-2);
  color: var(--text-muted);
  background: var(--surface);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 6px;
}
.prose pre {
  background: #05060f;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.6;
}
[data-theme="light"] .prose pre { background: #0c0f24; color: #f5f5fa; }
.prose pre code { background: none; border: none; padding: 0; font-size: inherit; }

.prose img {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-inline: auto;
}
.prose figure { margin: 1.6em 0; }
.prose figcaption {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-top: 8px;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
.prose th, .prose td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}
.prose th {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.prose hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.4em 0;
}

.prose kbd {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: var(--surface-strong);
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 1px 6px;
}

/* =========================================================================
   Diagram kit — reusable figure components for rich notes.
   All built with plain HTML + CSS so notes stay dependency-free.
   ========================================================================= */

.fig {
  margin: 1.8em 0;
  padding: 22px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
}
.fig > .fig-cap {
  display: block;
  margin-top: 14px;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.84rem;
  font-family: var(--font-mono);
}
.fig-title {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-1);
  margin-bottom: 16px;
}

/* Generic node box */
.node {
  border-radius: 12px;
  border: 1px solid var(--border-strong);
  background: var(--surface-strong);
  padding: 12px 14px;
  font-size: 0.9rem;
  line-height: 1.4;
}
.node .node-h {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.node .node-h i { color: var(--accent-2); }
.node .node-sub { color: var(--text-muted); font-size: 0.8rem; margin-top: 4px; }
.node.accent-1 { border-color: color-mix(in srgb, var(--accent-1) 55%, transparent); }
.node.accent-2 { border-color: color-mix(in srgb, var(--accent-2) 55%, transparent); }
.node.accent-3 { border-color: color-mix(in srgb, var(--accent-3) 55%, transparent); }

/* Vertical layered stack with connectors */
.stack { display: flex; flex-direction: column; gap: 0; align-items: stretch; }
.stack .node { position: relative; }
.stack .node + .node { margin-top: 30px; }
.stack .node + .node::before {
  content: "▼";
  position: absolute;
  top: -25px; left: 50%;
  transform: translateX(-50%);
  color: var(--accent-2);
  font-size: 0.8rem;
}

/* Process-boundary group */
.proc-box {
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  padding: 16px;
  position: relative;
  margin-top: 14px;
}
.proc-box > .proc-label {
  position: absolute;
  top: -10px; left: 14px;
  background: var(--bg-2);
  padding: 1px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-1);
}

/* Horizontal flow of steps */
.flow {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 10px;
}
.flow .flow-step {
  flex: 1 1 0;
  min-width: 120px;
  position: relative;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface-strong);
  padding: 12px;
  font-size: 0.82rem;
}
.flow .flow-step .s-n {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent-1);
  display: block;
  margin-bottom: 4px;
}
.flow .flow-step .s-h { font-weight: 600; font-size: 0.88rem; }
.flow .flow-step .s-d { color: var(--text-muted); margin-top: 3px; font-size: 0.78rem; }
.flow .flow-arrow {
  align-self: center;
  color: var(--accent-2);
  font-size: 1rem;
  flex: 0 0 auto;
}
@media (max-width: 640px) {
  .flow { flex-direction: column; }
  .flow .flow-arrow { transform: rotate(90deg); align-self: center; }
}

/* Numbered steps (vertical, big index) */
.steps { list-style: none; margin: 1.4em 0; padding: 0; counter-reset: step; }
.steps > li {
  position: relative;
  padding: 4px 0 18px 56px;
  counter-increment: step;
}
.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0; top: 0;
  width: 38px; height: 38px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  color: #fff;
  background: var(--accent-grad);
}
.steps > li::after {
  content: "";
  position: absolute;
  left: 18px; top: 40px; bottom: 0;
  width: 2px;
  background: var(--border-strong);
}
.steps > li:last-child::after { display: none; }
.steps > li .st-h { font-weight: 600; font-family: var(--font-display); }
.steps > li .st-d { color: var(--text-muted); font-size: 0.92rem; margin-top: 2px; }

/* Callouts */
.callout {
  margin: 1.4em 0;
  padding: 14px 16px 14px 48px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  position: relative;
  font-size: 0.95rem;
}
.callout::before {
  position: absolute;
  left: 16px; top: 15px;
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
}
.callout.info { border-left: 3px solid var(--accent-1); }
.callout.info::before { content: "\f05a"; color: var(--accent-1); }
.callout.tip { border-left: 3px solid #22c55e; }
.callout.tip::before { content: "\f0eb"; color: #22c55e; }
.callout.warn { border-left: 3px solid #f59e0b; }
.callout.warn::before { content: "\f071"; color: #f59e0b; }
.callout.key { border-left: 3px solid var(--accent-2); }
.callout.key::before { content: "\f084"; color: var(--accent-2); }
.callout b, .callout strong { color: var(--text); }

/* KV-cache block grid (PagedAttention viz) */
.blocks { display: flex; flex-wrap: wrap; gap: 6px; margin: 6px 0; }
.blk {
  width: 38px; height: 38px;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  border: 1px solid var(--border-strong);
  background: var(--surface-strong);
  color: var(--text-muted);
}
.blk.a { background: color-mix(in srgb, var(--accent-1) 30%, transparent); color: var(--text); border-color: var(--accent-1); }
.blk.b { background: color-mix(in srgb, var(--accent-2) 30%, transparent); color: var(--text); border-color: var(--accent-2); }
.blk.c { background: color-mix(in srgb, var(--accent-3) 30%, transparent); color: var(--text); border-color: var(--accent-3); }
.blk.free { border-style: dashed; opacity: 0.5; }

/* Two-column comparison */
.cols2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 1.4em 0; }
@media (max-width: 640px) { .cols2 { grid-template-columns: 1fr; } }
.cols2 .col-card { padding: 16px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface); }
.cols2 .col-card h4 { margin: 0 0 8px; font-family: var(--font-display); font-size: 1rem; }
.cols2 .col-card.good { border-top: 3px solid #22c55e; }
.cols2 .col-card.bad { border-top: 3px solid #ef4444; }

/* Mini stat pills inline */
.stat-pill {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--surface-strong);
  border: 1px solid var(--border);
  color: var(--text);
}
.stat-pill b { color: var(--accent-1); }

/* Q&A collapsibles */
.qa { margin: 1.2em 0; }
.qa details {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  margin-bottom: 10px;
  overflow: hidden;
}
.qa details[open] { border-color: var(--border-strong); }
.qa summary {
  cursor: pointer;
  list-style: none;
  padding: 14px 18px 14px 44px;
  font-weight: 600;
  font-family: var(--font-display);
  position: relative;
  color: var(--text);
}
.qa summary::-webkit-details-marker { display: none; }
.qa summary::before {
  content: "Q";
  position: absolute;
  left: 16px; top: 50%;
  transform: translateY(-50%);
  width: 22px; height: 22px;
  border-radius: 6px;
  background: var(--accent-grad);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  display: flex; align-items: center; justify-content: center;
}
.qa summary::after {
  content: "+";
  position: absolute;
  right: 18px; top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.1rem;
}
.qa details[open] summary::after { content: "\2212"; }
.qa .qa-body {
  padding: 0 18px 16px 44px;
  color: var(--text-muted);
  font-size: 0.95rem;
}
.qa .qa-body strong { color: var(--text); }

/* ---------- Print ---------- */

@media print {
  .notes-toolbar, .tag-filters, .notes-search, .note-back { display: none !important; }
  .note-card, .prose pre, .prose blockquote {
    background: #fff !important;
    border: 1px solid #ddd !important;
    box-shadow: none !important;
  }
  .prose pre { color: #111 !important; }
}