/* =========================================================================
   multipage · Material Design 3 baseline (pure CSS, no build)
   Shared by every page. Tokens + chrome + one block per page layout.
   ========================================================================= */

/* ---- MD3 tokens : LIGHT ---- */
:root,
[data-theme="light"] {
  --primary:#6750A4; --on-primary:#FFFFFF; --primary-container:#EADDFF; --on-primary-container:#21005D;
  --secondary:#625B71; --secondary-container:#E8DEF8; --on-secondary-container:#1D192B;
  --tertiary:#7D5260; --tertiary-container:#FFD8E4;
  --background:#FEF7FF; --on-background:#1D1B20; --surface:#FEF7FF;
  --surface-container:#F3EDF7; --surface-container-high:#ECE6F0; --surface-variant:#E7E0EC;
  --on-surface:#1D1B20; --on-surface-variant:#49454F;
  --outline:#79747E; --outline-variant:#CAC4D0; --error:#B3261E; --success:#2E7D32;
  --elev-1:0 1px 2px rgba(0,0,0,.10),0 1px 3px 1px rgba(0,0,0,.06);
  --elev-2:0 2px 6px 2px rgba(0,0,0,.10),0 1px 2px rgba(0,0,0,.12);
  --elev-3:0 4px 8px 3px rgba(0,0,0,.12),0 1px 3px rgba(0,0,0,.14);
  --radius-sm:8px; --radius:16px; --radius-lg:28px;
  --font-body:"Roboto Flex","Roboto","Noto Sans TC",system-ui,sans-serif;
}
/* ---- MD3 tokens : DARK ---- */
[data-theme="dark"] {
  --primary:#D0BCFF; --on-primary:#381E72; --primary-container:#4F378B; --on-primary-container:#EADDFF;
  --secondary:#CCC2DC; --secondary-container:#4A4458; --on-secondary-container:#E8DEF8;
  --tertiary:#EFB8C8; --tertiary-container:#633B48;
  --background:#141218; --on-background:#E6E0E9; --surface:#141218;
  --surface-container:#211F26; --surface-container-high:#2B2930; --surface-variant:#49454F;
  --on-surface:#E6E0E9; --on-surface-variant:#CAC4D0;
  --outline:#938F99; --outline-variant:#49454F; --error:#F2B8B5; --success:#A5D6A7;
}

/* ---- Reset / base ---- */
* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
  margin:0; font-family:var(--font-body); background:var(--background); color:var(--on-background);
  -webkit-font-smoothing:antialiased; transition:background .2s,color .2s; overflow-x:hidden;
}
a { color:inherit; text-decoration:none; }
.material-symbols-rounded { font-variation-settings:"FILL" 0,"wght" 400,"GRAD" 0,"opsz" 24; line-height:1; user-select:none; }
.skip-link {
  position:absolute; left:-999px; top:8px; z-index:60; background:var(--primary); color:var(--on-primary);
  padding:8px 14px; border-radius:var(--radius-lg);
}
.skip-link:focus { left:12px; }

/* ---- App bar ---- */
.appbar { position:sticky; top:0; z-index:30; background:var(--surface-container); box-shadow:var(--elev-1); }
.appbar__inner { max-width:1100px; margin:0 auto; padding:10px 16px; display:flex; align-items:center; gap:12px; }
.brand { display:flex; align-items:center; gap:8px; font-weight:700; font-size:1.1rem; color:var(--on-surface); min-width:0; overflow:hidden; }
.brand__logo { color:var(--primary); flex:0 0 auto; }
.brand__name { overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.appbar__actions { margin-left:auto; display:flex; align-items:center; gap:8px; flex:0 0 auto; }
.icon-btn { display:inline-flex; align-items:center; gap:4px; border:none; background:transparent; color:var(--on-surface-variant);
  border-radius:var(--radius-lg); padding:8px 10px; cursor:pointer; font:inherit; transition:background .15s; }
.icon-btn:hover { background:var(--surface-container-high); }
.icon-btn__txt { font-size:.85rem; font-weight:500; }

/* ---- Cross-page nav ---- */
.pagenav {
  position:sticky; top:56px; z-index:25; border-bottom:1px solid var(--outline-variant);
  background:color-mix(in srgb,var(--background) 88%,transparent); backdrop-filter:saturate(180%) blur(8px);
}
.pagenav__inner { max-width:1100px; margin:0 auto; padding:8px 12px; display:flex; gap:8px; overflow-x:auto; scrollbar-width:none; }
.pagenav__inner::-webkit-scrollbar { display:none; }
.navpill {
  display:inline-flex; align-items:center; gap:6px; flex:0 0 auto; padding:7px 14px; border-radius:var(--radius-lg);
  font-size:.85rem; font-weight:500; color:var(--on-surface-variant); border:1px solid var(--outline-variant);
  background:transparent; white-space:nowrap; cursor:pointer; transition:background .15s,color .15s,border-color .15s;
}
.navpill .material-symbols-rounded { font-size:18px; }
.navpill:hover { background:var(--surface-container-high); }
.navpill--active { background:var(--secondary-container); color:var(--on-secondary-container); border-color:transparent; }

/* ---- Page scaffold ---- */
.page { max-width:1100px; margin:0 auto; padding:32px 16px 16px; }
.page-head { margin-bottom:22px; }
.page-head h1 { margin:0 0 6px; font-size:clamp(1.6rem,4vw,2.2rem); font-weight:700; letter-spacing:-.01em; color:var(--on-surface); }
.page-head__sub { margin:0; max-width:62ch; font-size:1rem; line-height:1.5; color:var(--on-surface-variant); }
.empty { color:var(--on-surface-variant); }

/* ---- Hero stats (hub) ---- */
.hero__stats { display:grid; grid-template-columns:repeat(auto-fit,minmax(140px,1fr)); gap:14px; margin:0 0 26px; }
.hero__stat { background:var(--surface-container); border-radius:var(--radius); padding:20px 18px; display:flex; flex-direction:column; gap:4px; border:1px solid var(--outline-variant); }
.hero__stat-value { font-size:2rem; font-weight:700; color:var(--primary); font-variant-numeric:tabular-nums; line-height:1.1; }
.hero__stat-label { font-size:.85rem; color:var(--on-surface-variant); }

/* ---- Cards grid ---- */
.grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(260px,1fr)); gap:16px; }
.card { background:var(--surface-container); border-radius:var(--radius); padding:20px; cursor:pointer;
  border:1px solid transparent; transition:box-shadow .18s,transform .18s,border-color .18s; display:flex; flex-direction:column; gap:10px; }
.card:hover,.card:focus-visible { box-shadow:var(--elev-2); transform:translateY(-2px); border-color:var(--outline-variant); outline:none; }
.card--nav .card__icon { font-size:28px; color:var(--primary); }
.card__title { margin:0; font-size:1.05rem; font-weight:600; color:var(--on-surface); }
.card__summary { margin:0; font-size:.9rem; line-height:1.5; color:var(--on-surface-variant); }
.card__tags { margin-top:auto; display:flex; flex-wrap:wrap; gap:6px; }
.tag { font-size:.72rem; color:var(--on-surface-variant); background:var(--surface-variant); padding:2px 8px; border-radius:var(--radius-sm); }

/* ---- Toolbar / search / chips ---- */
.toolbar { display:flex; flex-wrap:wrap; gap:12px; align-items:center; margin-bottom:14px; }
.search { flex:1 1 220px; min-width:160px; padding:10px 14px; border-radius:var(--radius-lg); border:1px solid var(--outline-variant);
  background:var(--surface-container); color:var(--on-surface); font:inherit; }
.search:focus { outline:2px solid var(--primary); outline-offset:1px; }
.chips { display:flex; flex-wrap:wrap; gap:8px; }
.chip { padding:7px 14px; border-radius:var(--radius-lg); font-size:.85rem; font-weight:500; color:var(--on-surface-variant);
  border:1px solid var(--outline-variant); background:transparent; cursor:pointer; transition:background .15s,color .15s; }
.chip:hover { background:var(--surface-container-high); }
.chip--active { background:var(--secondary-container); color:var(--on-secondary-container); border-color:transparent; }
.result-count { margin:0 0 14px; font-size:.85rem; color:var(--on-surface-variant); }

/* ---- Article ---- */
.reading-progress { position:fixed; top:0; left:0; height:3px; width:0; background:var(--primary); z-index:40; transition:width .1s linear; }
.article-layout { display:grid; grid-template-columns:200px 1fr; gap:32px; align-items:start; }
.toc { position:sticky; top:108px; }
.toc__inner { display:flex; flex-direction:column; gap:4px; border-left:2px solid var(--outline-variant); }
.toc-link { padding:6px 14px; font-size:.9rem; color:var(--on-surface-variant); border-left:2px solid transparent; margin-left:-2px; }
.toc-link:hover { color:var(--on-surface); }
.toc-link--active { color:var(--primary); border-left-color:var(--primary); font-weight:600; }
.prose { max-width:70ch; color:var(--on-surface-variant); }
.prose h2 { color:var(--on-surface); font-size:1.4rem; margin:0 0 12px; scroll-margin-top:120px; }
.prose h3 { color:var(--on-surface); font-size:1.12rem; margin:22px 0 8px; }
.prose p { line-height:1.75; margin:0 0 14px; }
.prose ul { margin:0 0 14px; padding-left:22px; line-height:1.75; }
.prose blockquote { margin:0 0 16px; padding:8px 18px; border-left:4px solid var(--primary); color:var(--on-surface); font-style:italic; }
.prose pre { background:var(--surface-container); padding:14px 16px; border-radius:var(--radius); overflow:auto; border:1px solid var(--outline-variant); }
.prose code { font-family:"Roboto Mono",ui-monospace,monospace; font-size:.85rem; }
.article-section { margin-bottom:28px; }

/* ---- Dashboard ---- */
.stat-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(160px,1fr)); gap:16px; margin-bottom:20px; }
.stat-card { background:var(--surface-container); border:1px solid var(--outline-variant); border-radius:var(--radius); padding:18px; display:flex; flex-direction:column; gap:6px; }
.stat-label { font-size:.82rem; color:var(--on-surface-variant); }
.stat-value { font-size:1.6rem; font-weight:700; color:var(--on-surface); font-variant-numeric:tabular-nums; }
.stat-unit { font-size:.85rem; font-weight:500; color:var(--on-surface-variant); }
.stat-delta { font-size:.8rem; font-weight:600; }
.stat-delta--up { color:var(--success); }
.stat-delta--down { color:var(--error); }
.panel-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(280px,1fr)); gap:16px; margin-bottom:20px; }
.panel { margin:0; background:var(--surface-container); border:1px solid var(--outline-variant); border-radius:var(--radius); padding:18px; }
.panel figcaption { font-weight:600; color:var(--on-surface); margin-bottom:10px; }
.panel--wide { grid-column:1/-1; }
.chart-wrap { width:100%; }
.chart-wrap svg { width:100%; height:auto; display:block; }
.bar-rect { fill:var(--primary); transition:fill .15s; }
.bar-rect:hover { fill:var(--tertiary); }
.bar-value { fill:var(--on-surface); font-size:13px; font-weight:600; font-family:var(--font-body); }
.bar-label { fill:var(--on-surface-variant); font-size:12px; font-family:var(--font-body); }
.axis-line { stroke:var(--outline-variant); stroke-width:1.5; }
.line-path { stroke:var(--primary); stroke-width:2.5; }
.line-area { fill:var(--primary); opacity:.12; }
.line-dot { fill:var(--primary); }

/* ---- Data table ---- */
.table-wrap { overflow-x:auto; border-radius:var(--radius); border:1px solid var(--outline-variant); }
.data-table,.cmp-table { width:100%; border-collapse:collapse; background:var(--surface-container); font-size:.9rem; }
.data-table th,.data-table td { padding:11px 14px; text-align:left; border-bottom:1px solid var(--outline-variant); color:var(--on-surface); white-space:nowrap; }
.data-table thead th { background:var(--surface-container-high); font-weight:600; color:var(--on-surface-variant); position:sticky; top:0; }
.th-sort { cursor:pointer; user-select:none; }
.th-sort:hover { color:var(--primary); }
.data-table tbody tr:hover { background:var(--surface-container-high); }
.row-link { color:var(--primary); }

/* ---- Timeline ---- */
.timeline { list-style:none; margin:0; padding:0; position:relative; }
.timeline::before { content:""; position:absolute; left:7px; top:6px; bottom:6px; width:2px; background:var(--outline-variant); }
.tl-item { position:relative; padding:0 0 18px 36px; }
.tl-item:last-child { padding-bottom:0; }
.tl-dot { position:absolute; left:0; top:6px; width:16px; height:16px; border-radius:50%; background:var(--primary); border:3px solid var(--background); box-shadow:0 0 0 2px var(--primary); }
.tl-card { background:var(--surface-container); border-radius:var(--radius); padding:14px 18px; border:1px solid var(--outline-variant); }
.tl-date { font-size:.78rem; font-weight:600; letter-spacing:.04em; color:var(--primary); }
.tl-title { margin:4px 0 6px; font-size:1.05rem; color:var(--on-surface); }
.tl-body { margin:0; font-size:.9rem; line-height:1.5; color:var(--on-surface-variant); }

/* ---- Bento ---- */
.bento { display:grid; grid-template-columns:repeat(4,1fr); grid-auto-rows:120px; gap:14px; }
.tile { background:var(--surface-container); border:1px solid var(--outline-variant); border-radius:var(--radius); padding:18px; display:flex; flex-direction:column; gap:6px; overflow:hidden; }
.tile--accent { background:linear-gradient(135deg,var(--primary-container),var(--secondary-container)); border-color:transparent; }
.tile--lg { grid-column:span 2; grid-row:span 2; }
.tile--tall { grid-row:span 2; }
.tile--wide { grid-column:span 2; }
.tile--md { grid-column:span 2; }
.tile__icon { font-size:26px; color:var(--primary); }
.tile__value { font-size:1.7rem; font-weight:700; color:var(--on-surface); }
.tile__title { margin:0; font-size:1rem; color:var(--on-surface); }
.tile__body { margin:0; font-size:.85rem; line-height:1.45; color:var(--on-surface-variant); }

/* ---- Kanban ---- */
.kanban { display:grid; grid-auto-flow:column; grid-auto-columns:minmax(240px,1fr); gap:14px; overflow-x:auto; padding-bottom:8px; }
.kb-col { background:var(--surface-container-high); border-radius:var(--radius); padding:12px; }
.kb-col__head { display:flex; align-items:center; gap:8px; font-weight:600; color:var(--on-surface); margin-bottom:10px; padding:0 4px; }
.kb-col__count { font-size:.75rem; background:var(--secondary-container); color:var(--on-secondary-container); border-radius:var(--radius-lg); padding:1px 8px; }
.kb-col__body { display:flex; flex-direction:column; gap:10px; }
.kb-card { background:var(--surface); border:1px solid var(--outline-variant); border-radius:var(--radius-sm); padding:12px 14px; display:flex; flex-direction:column; gap:8px; }
.kb-card__title { margin:0; font-size:.95rem; color:var(--on-surface); }
.kb-card__body { margin:0; font-size:.82rem; line-height:1.45; color:var(--on-surface-variant); }

/* ---- Accordion (faq) ---- */
.accordion { display:flex; flex-direction:column; gap:10px; }
.acc-item { background:var(--surface-container); border-radius:var(--radius); border:1px solid var(--outline-variant); overflow:hidden; }
.acc-q { display:flex; align-items:center; justify-content:space-between; gap:12px; padding:16px 18px; cursor:pointer; font-weight:600; color:var(--on-surface); list-style:none; }
.acc-q::-webkit-details-marker { display:none; }
.acc-chevron { transition:transform .2s; color:var(--on-surface-variant); }
.acc-item[open] .acc-chevron { transform:rotate(180deg); }
.acc-a { padding:0 18px 18px; font-size:.92rem; line-height:1.6; color:var(--on-surface-variant); }

/* ---- Comparison ---- */
.cmp-table th,.cmp-table td { padding:14px 16px; text-align:center; border-bottom:1px solid var(--outline-variant); color:var(--on-surface); }
.cmp-table thead th { vertical-align:bottom; }
.cmp-feat { text-align:left !important; font-weight:600; color:var(--on-surface-variant); }
.cmp-plan { font-weight:700; font-size:1.05rem; }
.cmp-price { color:var(--primary); font-weight:600; }
.cmp-note { font-size:.78rem; color:var(--on-surface-variant); }
.cmp-col--hl { background:var(--secondary-container); }
.cmp-yes { color:var(--success); }
.cmp-no { color:var(--outline); }

/* ---- Leaderboard ---- */
.seg { display:inline-flex; gap:4px; background:var(--surface-container-high); border-radius:var(--radius-lg); padding:4px; margin-bottom:18px; }
.seg__btn { border:none; background:transparent; color:var(--on-surface-variant); padding:8px 18px; border-radius:var(--radius-lg); cursor:pointer; font:inherit; font-weight:500; }
.seg__btn--active { background:var(--primary); color:var(--on-primary); }
.lb-list { list-style:none; margin:0 0 18px; padding:0; display:flex; flex-direction:column; gap:8px; }
.lb-row { display:grid; grid-template-columns:auto auto 1fr auto auto; align-items:center; gap:12px; background:var(--surface-container); border:1px solid var(--outline-variant); border-radius:var(--radius); padding:12px 16px; }
.lb-rank { font-variant-numeric:tabular-nums; font-weight:700; color:var(--on-surface-variant); min-width:1.5em; }
.lb-tier { font-weight:700; width:1.8em; height:1.8em; display:inline-grid; place-items:center; border-radius:50%; color:#fff; font-size:.8rem; }
.lb-tier--S { background:#B3261E; } .lb-tier--A { background:#7D5260; } .lb-tier--B { background:#6750A4; }
.lb-tier--C { background:#625B71; } .lb-tier--D { background:#79747E; }
.lb-name { font-weight:600; color:var(--on-surface); }
.lb-meta { font-size:.82rem; color:var(--on-surface-variant); }
.lb-score { font-weight:700; font-variant-numeric:tabular-nums; color:var(--primary); }
.lb-tier-group { margin-bottom:16px; }
.lb-tier-head { display:inline-grid; place-items:center; min-width:2em; height:2em; border-radius:var(--radius-sm); color:#fff; font-weight:700; padding:0 10px; margin-bottom:10px; }

/* ---- Scrolly ---- */
.scrolly { display:grid; grid-template-columns:1fr 1fr; gap:32px; align-items:start; }
.scrolly-sticky { position:sticky; top:120px; height:60vh; display:flex; }
.scrolly-visual { flex:1; display:flex; align-items:center; justify-content:center; background:var(--surface-container); border:1px solid var(--outline-variant); border-radius:var(--radius-lg); padding:24px; }
.scrolly-stat { font-size:2.4rem; font-weight:700; text-align:center; }
.scrolly-steps { display:flex; flex-direction:column; gap:60vh; padding:20vh 0; }
.scrolly-step { background:var(--surface-container); border:1px solid var(--outline-variant); border-radius:var(--radius); padding:20px 22px; opacity:.4; transition:opacity .3s; }
.scrolly-step p { margin:0; font-size:1.1rem; line-height:1.6; color:var(--on-surface); }
.scrolly-step--active { opacity:1; }

/* ---- Map ---- */
.map-layout { display:grid; grid-template-columns:1fr 300px; gap:18px; align-items:start; }
.map-box { height:460px; border-radius:var(--radius); overflow:hidden; border:1px solid var(--outline-variant); background:var(--surface-container); }
.map-fallback { height:100%; display:flex; align-items:center; justify-content:center; color:var(--on-surface-variant); padding:20px; text-align:center; }
.map-list { list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:8px; max-height:460px; overflow:auto; }
.place { display:flex; flex-direction:column; gap:3px; background:var(--surface-container); border:1px solid var(--outline-variant); border-radius:var(--radius-sm); padding:12px 14px; cursor:pointer; }
.place:hover,.place:focus-visible { border-color:var(--primary); outline:none; }
.place b { color:var(--on-surface); }
.place span { font-size:.82rem; color:var(--on-surface-variant); }

/* ---- Dialog ---- */
.dialog { border:none; border-radius:var(--radius-lg); background:var(--surface-container-high); color:var(--on-surface); max-width:600px; width:calc(100% - 32px); padding:0; box-shadow:var(--elev-3); }
.dialog::backdrop { background:rgba(0,0,0,.5); }
.dialog__bar { display:flex; align-items:center; padding:8px 12px; border-bottom:1px solid var(--outline-variant); position:sticky; top:0; background:var(--surface-container-high); }
.dialog__spacer { flex:1; }
.dialog__body { padding:24px; }
.dialog__body h2 { margin-top:0; color:var(--on-surface); }
.dialog__body p { color:var(--on-surface-variant); line-height:1.65; }
.dialog__body .card__tags { margin:0 0 14px; }

/* ---- Footer ---- */
.footer { text-align:center; padding:32px 16px; margin-top:32px; color:var(--on-surface-variant); font-size:.85rem; border-top:1px solid var(--outline-variant); }

/* ---- Responsive ---- */
@media (max-width:860px) {
  .article-layout { grid-template-columns:1fr; }
  .toc { position:static; }
  .toc__inner { flex-direction:row; flex-wrap:wrap; border-left:none; }
  .scrolly { grid-template-columns:1fr; }
  .scrolly-sticky { position:sticky; top:64px; height:auto; }
  .scrolly-steps { gap:30vh; padding:10vh 0; }
  .map-layout { grid-template-columns:1fr; }
  .map-list { flex-direction:row; max-height:none; }
  .bento { grid-template-columns:repeat(2,1fr); }
  .tile--lg,.tile--wide,.tile--md { grid-column:span 2; }
}
@media (max-width:600px) {
  .grid { grid-template-columns:1fr; }
  .bento { grid-template-columns:1fr; }
  .tile--lg,.tile--wide,.tile--md,.tile--tall { grid-column:span 1; grid-row:span 1; }
  .lb-row { grid-template-columns:auto auto 1fr auto; }
  .lb-meta { display:none; }
  .icon-btn__txt { font-size:.8rem; }
}
@media (max-width:375px) {
  .appbar__inner,.pagenav__inner,.page { padding-left:12px; padding-right:12px; }
  .page-head h1 { font-size:1.4rem; }
}

/* Respect reduced motion */
@media (prefers-reduced-motion:reduce) {
  html { scroll-behavior:auto; }
  * { transition:none !important; }
}

/* =========================================================================
   ✦ PREMIUM LAYER — "Ethereal Glass" tech / marketing skin
   Layered on top of the MD3 baseline above. Overrides tokens, typography,
   background texture, glass surfaces, glow and motion. Trailing source order
   means these win for equal specificity; layout structure is untouched.
   ========================================================================= */

/* ---- fonts (premium grotesk; CN falls back to Noto Sans TC) ---- */
:root {
  --font-body:"Sora","Noto Sans TC",system-ui,sans-serif;
  --font-display:"Space Grotesk","Noto Sans TC",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"Roboto Mono",monospace;
  --ease-spring:cubic-bezier(.22,.61,.36,1);
}

/* ---- DARK : deep OLED base + violet / sky / emerald accents (default) ---- */
[data-theme="dark"] {
  --primary:#b69dff; --on-primary:#1c1140;
  --primary-container:rgba(140,108,255,.18); --on-primary-container:#ece6ff;
  --secondary:#7fd7ff; --secondary-container:rgba(125,211,252,.16); --on-secondary-container:#dcf1ff;
  --tertiary:#48e0a6; --tertiary-container:rgba(52,211,153,.16);
  --background:#06060d; --on-background:#eceaf6; --surface:#06060d;
  --surface-container:rgba(255,255,255,.045);
  --surface-container-high:rgba(255,255,255,.085);
  --surface-variant:rgba(255,255,255,.07);
  --on-surface:#f4f3fb; --on-surface-variant:#a9a7c0;
  --outline:#4a4868; --outline-variant:rgba(255,255,255,.10);
  --error:#ffb4ab; --success:#7ee0a8;
  --elev-1:0 1px 0 rgba(255,255,255,.04) inset, 0 8px 24px -16px rgba(0,0,0,.8);
  --elev-2:0 1px 0 rgba(255,255,255,.06) inset, 0 18px 48px -24px rgba(90,60,200,.55);
  --elev-3:0 1px 0 rgba(255,255,255,.07) inset, 0 32px 80px -28px rgba(80,40,180,.65);
}

/* ---- LIGHT : soft luminous off-white, same accent identity ---- */
:root,
[data-theme="light"] {
  --primary:#6d3df5; --on-primary:#ffffff;
  --primary-container:#ece4ff; --on-primary-container:#22054f;
  --secondary:#1f7ae0; --secondary-container:#e2efff; --on-secondary-container:#06294f;
  --tertiary:#0f9f6e; --tertiary-container:#d7f6e8;
  --background:#f6f5fb; --on-background:#16151f; --surface:#f6f5fb;
  --surface-container:rgba(255,255,255,.72);
  --surface-container-high:#ffffff;
  --surface-variant:#ece9f6;
  --on-surface:#16151f; --on-surface-variant:#56546b;
  --outline:#8a86a3; --outline-variant:#dcd8ec;
  --elev-1:0 2px 10px -6px rgba(70,40,160,.25);
  --elev-2:0 14px 40px -22px rgba(70,40,160,.40);
  --elev-3:0 26px 64px -28px rgba(70,40,160,.45);
}

/* ---- ambient background mesh (fixed, behind everything) ---- */
body::before {
  content:""; position:fixed; inset:0; z-index:-1; pointer-events:none;
  background:
    radial-gradient(48vw 48vw at 12% -6%, rgba(140,108,255,.30), transparent 60%),
    radial-gradient(42vw 42vw at 92% 6%, rgba(46,196,255,.20), transparent 60%),
    radial-gradient(54vw 50vw at 78% 102%, rgba(52,211,153,.16), transparent 62%);
  filter:saturate(120%);
}
[data-theme="light"] body::before {
  background:
    radial-gradient(46vw 46vw at 10% -8%, rgba(140,108,255,.18), transparent 60%),
    radial-gradient(40vw 40vw at 95% 4%, rgba(46,150,255,.14), transparent 60%),
    radial-gradient(52vw 48vw at 82% 104%, rgba(15,180,120,.12), transparent 62%);
}

/* ---- typography ---- */
body { letter-spacing:-.005em; }
.brand__name { font-family:var(--font-display); font-weight:700; letter-spacing:-.02em; }
.brand__logo { color:var(--primary); filter:drop-shadow(0 0 10px color-mix(in srgb,var(--primary) 60%,transparent)); }
.page-head h1 {
  font-family:var(--font-display); font-weight:700; letter-spacing:-.03em;
  font-size:clamp(2rem,5.2vw,3.2rem); line-height:1.05;
}
.page-head__sub { font-size:1.06rem; max-width:64ch; }
.prose h2, .prose h3, .tl-title, .cmp-plan, .tile__title, .kb-col__head { font-family:var(--font-display); letter-spacing:-.01em; }
.prose code, .prose pre { font-family:var(--font-mono); }

/* hub hero headline: gradient ink */
.page--hub .page-head h1 {
  background:linear-gradient(100deg,var(--on-surface) 12%,var(--primary) 54%,var(--secondary) 96%);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}

/* ---- app bar + nav : true glass (blur is fine on sticky chrome) ---- */
.appbar {
  background:color-mix(in srgb,var(--background) 72%,transparent);
  backdrop-filter:saturate(180%) blur(14px); -webkit-backdrop-filter:saturate(180%) blur(14px);
  box-shadow:none; border-bottom:1px solid var(--outline-variant);
}
.pagenav { top:57px; background:color-mix(in srgb,var(--background) 70%,transparent); }
.navpill { transition:background .25s var(--ease-spring),color .25s var(--ease-spring),border-color .25s,box-shadow .25s; }
.navpill--active {
  background:color-mix(in srgb,var(--primary) 18%,transparent); color:var(--on-surface);
  border-color:color-mix(in srgb,var(--primary) 45%,transparent);
  box-shadow:0 0 0 1px color-mix(in srgb,var(--primary) 25%,transparent), 0 6px 20px -10px color-mix(in srgb,var(--primary) 80%,transparent);
}
.icon-btn:hover { background:var(--surface-container-high); }

/* ---- GitHub star button (top-right) ---- */
.gh-star {
  display:inline-flex; align-items:center; gap:6px;
  padding:7px 12px; border-radius:999px;
  border:1px solid var(--outline-variant); background:var(--surface-container);
  color:var(--on-surface); font-size:.85rem; font-weight:600;
  font-variant-numeric:tabular-nums; line-height:1;
  transition:transform .25s var(--ease-spring),border-color .25s,box-shadow .25s,background .25s;
}
.gh-star:hover {
  transform:translateY(-1px);
  border-color:color-mix(in srgb,#ffc857 55%,transparent);
  box-shadow:0 8px 20px -10px rgba(255,200,87,.6);
}
.gh-star:focus-visible { outline:2px solid color-mix(in srgb,#ffc857 80%,transparent); outline-offset:2px; }
.gh-star__icon { font-size:20px; color:#ffc857; font-variation-settings:"FILL" 1,"wght" 500; filter:drop-shadow(0 0 8px rgba(255,200,87,.55)); }
.gh-star__count:empty { display:none; }
@media (max-width:380px) { .gh-star { padding:7px 9px; } .gh-star__count { display:none; } }

/* ---- hero stats : glowing figures ---- */
.hero__stats { gap:16px; margin-bottom:32px; }
.hero__stat {
  position:relative; padding:24px 20px; border:1px solid var(--outline-variant);
  background:var(--surface-container); border-radius:20px; box-shadow:var(--elev-1);
  overflow:hidden; transition:transform .4s var(--ease-spring),border-color .4s,box-shadow .4s;
}
.hero__stat::after { content:""; position:absolute; inset:0 0 auto 0; height:1px; background:linear-gradient(90deg,transparent,color-mix(in srgb,var(--primary) 60%,transparent),transparent); }
.hero__stat:hover { transform:translateY(-4px); border-color:color-mix(in srgb,var(--primary) 35%,transparent); box-shadow:var(--elev-2); }
.hero__stat-value {
  font-family:var(--font-display); font-size:2.6rem; letter-spacing:-.03em;
  color:var(--primary); text-shadow:0 0 28px color-mix(in srgb,var(--primary) 45%,transparent);
}
.hero__stat-label { font-size:.82rem; letter-spacing:.01em; }

/* ---- cards : translucent glass panels with lift + glow ---- */
.card, .stat-card, .panel, .tl-card, .acc-item, .tile, .kb-card, .lb-row, .scrolly-step, .place {
  border-radius:20px; border:1px solid var(--outline-variant);
  background:var(--surface-container); box-shadow:var(--elev-1);
}
.card { padding:22px; transition:transform .45s var(--ease-spring),box-shadow .45s var(--ease-spring),border-color .45s; }
.card:hover, .card:focus-visible {
  transform:translateY(-5px); box-shadow:var(--elev-3);
  border-color:color-mix(in srgb,var(--primary) 38%,transparent);
}
.card--nav { position:relative; overflow:hidden; }
.card--nav::before {
  content:""; position:absolute; inset:0; opacity:0; transition:opacity .45s var(--ease-spring);
  background:radial-gradient(60% 80% at 0% 0%, color-mix(in srgb,var(--primary) 16%,transparent), transparent 70%);
}
.card--nav:hover::before { opacity:1; }
.card--nav .card__icon { font-size:30px; filter:drop-shadow(0 0 12px color-mix(in srgb,var(--primary) 50%,transparent)); }
.card__title { font-family:var(--font-display); letter-spacing:-.01em; font-size:1.12rem; }

/* tags / chips : pill outlines */
.tag { background:color-mix(in srgb,var(--primary) 12%,transparent); color:var(--on-surface-variant); border:1px solid var(--outline-variant); border-radius:999px; padding:3px 10px; font-size:.72rem; }
.chip { transition:background .25s var(--ease-spring),color .25s,border-color .25s,box-shadow .25s; }
.chip--active {
  background:color-mix(in srgb,var(--primary) 18%,transparent); color:var(--on-surface);
  border-color:color-mix(in srgb,var(--primary) 45%,transparent);
  box-shadow:0 6px 18px -10px color-mix(in srgb,var(--primary) 80%,transparent);
}
.search { border-radius:999px; }
.search:focus { outline:2px solid color-mix(in srgb,var(--primary) 70%,transparent); }

/* ---- dashboard stats + charts ---- */
.stat-card { padding:20px; }
.stat-value { font-family:var(--font-display); letter-spacing:-.02em; }
.panel { border-radius:22px; }
.bar-rect { fill:var(--primary); }
.bar-rect:hover { fill:var(--secondary); }
.line-path { stroke:var(--primary); filter:drop-shadow(0 4px 10px color-mix(in srgb,var(--primary) 40%,transparent)); }
.line-area { fill:var(--primary); opacity:.16; }

/* ---- timeline : glowing rail + dots ---- */
.timeline::before { background:linear-gradient(var(--primary),color-mix(in srgb,var(--secondary) 70%,transparent)); opacity:.5; }
.tl-dot { background:var(--primary); border-color:var(--background); box-shadow:0 0 0 2px var(--primary),0 0 16px color-mix(in srgb,var(--primary) 70%,transparent); }
.tl-card { transition:transform .4s var(--ease-spring),border-color .4s; }
.tl-card:hover { transform:translateX(4px); border-color:color-mix(in srgb,var(--primary) 35%,transparent); }
.tl-date { color:var(--primary); }

/* ---- bento : richer accent tiles ---- */
.bento { gap:16px; }
.tile { border-radius:22px; transition:transform .4s var(--ease-spring),border-color .4s,box-shadow .4s; }
.tile:hover { transform:translateY(-4px); box-shadow:var(--elev-2); border-color:color-mix(in srgb,var(--primary) 30%,transparent); }
.tile--accent {
  background:linear-gradient(140deg,color-mix(in srgb,var(--primary) 30%,var(--surface-container)),color-mix(in srgb,var(--tertiary) 22%,var(--surface-container)));
  border-color:color-mix(in srgb,var(--primary) 30%,transparent);
}
.tile__icon { filter:drop-shadow(0 0 10px color-mix(in srgb,var(--primary) 45%,transparent)); }
.tile__value { font-family:var(--font-display); letter-spacing:-.02em; }

/* ---- accordion / faq ---- */
.acc-item { border-radius:18px; }
.acc-item[open] { border-color:color-mix(in srgb,var(--primary) 32%,transparent); box-shadow:var(--elev-2); }
.acc-q { font-family:var(--font-display); }

/* ---- comparison ---- */
/* wide multi-column tables scroll horizontally inside .table-wrap instead of
   cramming; the wrapper (overflow-x:auto) contains it so the page never overflows */
.cmp-table { border-radius:20px; overflow:hidden; min-width:720px; }
.cmp-table th, .cmp-table td { white-space:nowrap; }
.cmp-feat { white-space:normal !important; }
.cmp-col--hl { background:color-mix(in srgb,var(--primary) 14%,transparent); }
.cmp-price { color:var(--primary); }
.cmp-yes { color:var(--tertiary); filter:drop-shadow(0 0 8px color-mix(in srgb,var(--tertiary) 50%,transparent)); }

/* ---- article : prose polish + terminal-style code ---- */
/* let the 1fr grid track collapse on mobile so a wide <pre> scrolls
   internally instead of pushing the page (min-width:auto -> 0) */
.article-layout, .article-body, .toc, .prose { min-width:0; }
.prose pre { max-width:100%; }
.prose blockquote {
  border-left:3px solid var(--primary); border-radius:0 14px 14px 0;
  background:color-mix(in srgb,var(--primary) 8%,transparent); padding:14px 20px; color:var(--on-surface);
}
.prose pre {
  border-radius:16px; border:1px solid var(--outline-variant);
  background:color-mix(in srgb,#000 35%,var(--surface-container)); box-shadow:var(--elev-1);
}
.toc-link--active { color:var(--primary); border-left-color:var(--primary); }
.reading-progress { background:linear-gradient(90deg,var(--primary),var(--secondary)); box-shadow:0 0 12px color-mix(in srgb,var(--primary) 70%,transparent); }

/* ---- table ---- */
.data-table, .cmp-table { border-radius:18px; }
.row-link { color:var(--primary); }

/* ---- dialog : glass ---- */
.dialog { border-radius:26px; border:1px solid var(--outline-variant); background:color-mix(in srgb,var(--background) 86%,var(--surface-container-high)); backdrop-filter:blur(18px); -webkit-backdrop-filter:blur(18px); }
.dialog::backdrop { background:rgba(4,2,16,.62); backdrop-filter:blur(3px); }
.dialog__body h2 { font-family:var(--font-display); letter-spacing:-.01em; }

/* ---- footer ---- */
.footer { border-top:1px solid var(--outline-variant); }

/* ---- ✦ scroll-reveal (added by app.js when supported & motion allowed) ---- */
.page.has-reveal [data-item] {
  opacity:0; transform:translateY(20px); filter:blur(3px);
  transition:opacity .7s var(--ease-spring), transform .7s var(--ease-spring), filter .7s var(--ease-spring);
  will-change:opacity,transform;
}
.page.has-reveal [data-item].in { opacity:1; transform:none; filter:none; }
/* table rows are excluded from JS reveal — keep them fully visible */
.page.has-reveal tr[data-item] { opacity:1; transform:none; filter:none; }
/* gentle stagger for grid-like collections */
.page.has-reveal .grid [data-item]:nth-child(2),
.page.has-reveal .bento [data-item]:nth-child(2),
.page.has-reveal .stat-grid [data-item]:nth-child(2) { transition-delay:.06s; }
.page.has-reveal .grid [data-item]:nth-child(3),
.page.has-reveal .bento [data-item]:nth-child(3),
.page.has-reveal .stat-grid [data-item]:nth-child(3) { transition-delay:.12s; }
.page.has-reveal .grid [data-item]:nth-child(4),
.page.has-reveal .bento [data-item]:nth-child(4),
.page.has-reveal .stat-grid [data-item]:nth-child(4) { transition-delay:.18s; }

@media (prefers-reduced-motion:reduce) {
  body::before { display:none; }
  .page.has-reveal [data-item] { opacity:1; transform:none; filter:none; }
}