/* Theme switch — prefer browser-native snapshot (GPU composited) via CSS View Transitions.
   Fallback selector below is scoped to colour-only props + a short tween and omits !important
   so it can't force expensive style recalc across the whole * tree. */
@keyframes vt-fade-out{from{opacity:1}to{opacity:0}}
@keyframes vt-fade-in{from{opacity:0}to{opacity:1}}
::view-transition-old(root){animation:vt-fade-out 180ms var(--motion-standard) both}
::view-transition-new(root){animation:vt-fade-in 180ms var(--motion-standard) both}
/* Fallback tween (only used when View Transitions unsupported): short, colour-only. */
.theme-transitioning *,.theme-transitioning *::before,.theme-transitioning *::after{transition:background-color var(--dur-fast) var(--motion-standard),color var(--dur-fast) var(--motion-standard),border-color var(--dur-fast) var(--motion-standard),fill var(--dur-fast) var(--motion-standard),stroke var(--dur-fast) var(--motion-standard)!important}
[data-theme="light"]{
  --primary:#3D5A6E;--on-primary:#fff;--primary-container:#D4DDE3;--on-primary-container:#1B2A33;
  --surface:#FFFFFF;--surface-container-lowest:#FFFFFF;--surface-container-low:#F8F9FA;
  --surface-container:#F2F3F5;--surface-container-high:#ECEDEF;--surface-container-highest:#E6E7E9;
  --on-surface:#1C1C1E;--on-surface-variant:#4A4D51;--outline:#75787C;--outline-variant:#D4D5D7;
  --cb-bg:#24282d;--cb-text:rgba(255,255,255,.87);--cb-line:rgba(255,255,255,.2);--cb-bar-bg:rgba(255,255,255,.04);--cb-bar-border:rgba(255,255,255,.06);--cb-scroll-thumb:rgba(255,255,255,.12);--cb-scroll-track:rgba(255,255,255,.02);--ripple:rgba(0,0,0,.08);
  --e1:0 1px 2px rgba(0,0,0,.05),0 1px 3px rgba(0,0,0,.03);
  --e2:0 2px 6px rgba(0,0,0,.07),0 1px 3px rgba(0,0,0,.04);
  --e3:0 4px 14px rgba(0,0,0,.09),0 2px 4px rgba(0,0,0,.05);
}
[data-theme="dark"]{
  --primary:#9AB0BF;--on-primary:#1B2A33;--primary-container:#354A54;--on-primary-container:#BFCDD5;
  --surface:#191B1D;--surface-container-lowest:#0C0D0F;--surface-container-low:#1E2022;
  --surface-container:#1E2022;--surface-container-high:#282A2D;--surface-container-highest:#333538;
  --on-surface:#E3E3E6;--on-surface-variant:#A0A3A8;--outline:#6B6F73;--outline-variant:#333739;
  --cb-bg:#24282d;--cb-text:rgba(255,255,255,.87);--cb-line:rgba(255,255,255,.2);--cb-bar-bg:rgba(255,255,255,.04);--cb-bar-border:rgba(255,255,255,.06);--cb-scroll-thumb:rgba(255,255,255,.12);--cb-scroll-track:rgba(255,255,255,.02);--ripple:rgba(255,255,255,.08);
  --e1:0 1px 3px rgba(0,0,0,.2),0 1px 2px rgba(0,0,0,.15);
  --e2:0 2px 6px rgba(0,0,0,.3),0 1px 3px rgba(0,0,0,.2);
  --e3:0 4px 14px rgba(0,0,0,.35),0 2px 4px rgba(0,0,0,.25);
}
:root{
  --shape-xs:4px;--shape-s:8px;--shape-m:12px;--shape-l:16px;--shape-xl:28px;--shape-full:9999px;
  /* Motion tokens — unified easing + duration across the whole UI (avoids
     scattered ad-hoc cubic-bezier / ease literals for consistent rhythm). */
  --motion-standard:cubic-bezier(.4,0,.2,1);       /* neutral, default */
  --motion-standard-decelerate:cubic-bezier(0,0,.2,1); /* fast-in slow-out (entrances) */
  --motion-emphasized:cubic-bezier(.2,0,0,1);      /* expressive, large elements */
  --motion-exit:cubic-bezier(.4,0,1,1);            /* accelerating exit */
  --ease-spring:cubic-bezier(.34,1.56,.64,1);      /* subtle overshoot for taps */
  --dur-fast:140ms;
  --dur-med:220ms;
  --dur-slow:320ms;
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
body{font-family:'Noto Sans SC','PingFang SC',Georgia,serif;background:var(--surface);color:var(--on-surface);line-height:1.75;font-size:16px;overflow-x:hidden;display:flex;flex-direction:column;min-height:100vh}
body.locked{overflow:hidden}
@media(max-width:768px){body.locked{padding-right:0!important}}
a{color:var(--primary);text-decoration:none}
.skip-link{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{position:static;width:auto;height:auto;padding:8px 16px;background:var(--primary);color:var(--on-primary);z-index:9999;font-size:14px;border-radius:var(--shape-s)}
::selection{background:var(--primary-container);color:var(--on-primary-container)}
::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--outline-variant);border-radius:3px}
.spacer{flex:1}.container{max-width:860px;margin:0 auto;padding:0 24px}

/* ── Top Bar ── */
.top-app-bar{position:sticky;top:0;z-index:100;height:56px;display:flex;align-items:center;padding:0 8px 0 24px;background:var(--surface)}
.top-app-bar::after{content:'';position:absolute;inset:0;box-shadow:var(--e1);opacity:0;transition:opacity var(--dur-med) var(--motion-standard);pointer-events:none;z-index:-1}
.top-app-bar.elevated::after{opacity:1}
.logo{font-family:'Cormorant Garamond',Georgia,serif;font-size:20px;font-weight:300;letter-spacing:.12em;color:var(--on-surface);cursor:pointer;user-select:none;padding:4px 8px;border-radius:8px;flex-shrink:0}
.icon-btn{width:40px;height:40px;border-radius:var(--shape-full);border:none;background:none;color:var(--on-surface-variant);display:flex;align-items:center;justify-content:center;cursor:pointer;position:relative;overflow:hidden;transition:transform 200ms var(--motion-standard);flex-shrink:0}
.icon-btn:hover{background:var(--surface-container-high)}
.icon-btn:active{background:var(--surface-container-highest)}
.icon-btn svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.theme-wrap{position:relative;width:22px;height:22px}
.theme-ico{position:absolute;inset:0;transition:transform var(--dur-slow) var(--motion-emphasized),opacity var(--dur-med) var(--motion-standard)}
.theme-ico.off{transform:rotate(-90deg) scale(0);opacity:0}

/* ── Tabs ── */
.page-tabs{position:sticky;top:56px;z-index:99;background:var(--surface);display:flex;border-bottom:1px solid var(--outline-variant);overflow-x:auto;scrollbar-width:none}
.page-tabs::-webkit-scrollbar{display:none}
.tab{flex:1;min-width:0;padding:8px 12px;border:none;background:none;font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;font-weight:400;color:var(--on-surface-variant);cursor:pointer;text-align:center;white-space:nowrap;transition:color var(--dur-med) var(--motion-standard);position:relative;overflow:hidden}
.tab:hover{color:var(--on-surface);background:var(--surface-container-low)}
.tab.active{color:var(--primary)}
.tab-bar{position:absolute;bottom:0;left:0;height:3px;background:var(--primary);border-radius:var(--shape-full) var(--shape-full) 0 0;pointer-events:none;transition:transform var(--dur-slow) var(--motion-emphasized)}

/* ── Page Transitions ── */
.page{display:none;padding-bottom:40px;contain:content}.page.active{display:block;flex:1}
@keyframes slideInRight{from{opacity:0;transform:translateX(52px) scale(.98)}to{opacity:1;transform:translateX(0) scale(1)}}
@keyframes slideInLeft{from{opacity:0;transform:translateX(-52px) scale(.98)}to{opacity:1;transform:translateX(0) scale(1)}}
@keyframes slideOutLeft{from{opacity:1;transform:translateX(0) scale(1)}to{opacity:0;transform:translateX(-36px) scale(.99)}}
@keyframes slideOutRight{from{opacity:1;transform:translateX(0) scale(1)}to{opacity:0;transform:translateX(36px) scale(.99)}}
.page.slide-in-right{animation:slideInRight var(--dur-med) var(--motion-standard-decelerate) both}
.page.slide-in-left{animation:slideInLeft var(--dur-med) var(--motion-standard-decelerate) both}
.page.slide-out-left{animation:slideOutLeft var(--dur-fast) var(--motion-exit) both}
.page.slide-out-right{animation:slideOutRight var(--dur-fast) var(--motion-exit) both}

/* ── Hero ── */
@keyframes heroReveal{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}
.hero{padding:40px 0 28px;min-height:160px}
.hero h1{font-family:'LXGW WenKai','Noto Serif SC','Songti SC','SimSun',serif;font-size:clamp(28px,5vw,40px);font-weight:300;color:var(--on-surface);letter-spacing:.06em;line-height:1.15;margin-bottom:10px;animation:heroReveal var(--dur-slow) var(--motion-standard) both}
.hero p{font-family:'LXGW WenKai','Noto Serif SC','Songti SC','SimSun',serif;font-size:15px;color:var(--on-surface-variant);line-height:1.75;max-width:480px;animation:heroReveal var(--dur-slow) var(--motion-standard) .04s both}
.page-hero{padding:32px 0 18px}
.page-hero h1{font-family:'LXGW WenKai','Noto Serif SC','Songti SC','SimSun',serif;font-size:clamp(26px,4vw,34px);font-weight:300;color:var(--on-surface);letter-spacing:.06em;margin-bottom:6px}
.page-hero p{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;color:var(--on-surface-variant)}

/* ── Filter Bar ── */
@keyframes filterBarIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}
@keyframes filterBarOut{from{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(-8px)}}
.filter-bar{display:none;align-items:center;gap:8px;padding:10px 16px;background:var(--primary-container);color:var(--on-primary-container);border-radius:10px;font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;margin-bottom:14px;box-shadow:var(--e1);opacity:0;transform:translateY(-8px)}
.filter-bar.on{display:flex;opacity:1;transform:translateY(0)}
.filter-bar.out{animation:filterBarOut var(--dur-fast) var(--motion-exit) forwards}
.filter-clear{margin-left:auto;padding:4px 12px;border-radius:var(--shape-full);border:none;background:rgba(0,0,0,.08);color:inherit;font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:12px;font-weight:400;cursor:pointer;position:relative;overflow:hidden}
[data-theme="dark"] .filter-clear{background:rgba(255,255,255,.08)}

/* ── Article Cards ── */
#articleList{scroll-margin-top:104px}
.article-list{padding-bottom:8px}
.card{padding:16px 20px;cursor:pointer;position:relative;overflow:hidden;opacity:0;transform:translateY(8px);contain:content;transition:transform var(--dur-fast) var(--motion-standard),box-shadow var(--dur-fast) var(--motion-standard),background var(--dur-fast) var(--motion-standard)}
@keyframes cardIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.card.show{opacity:1;transform:translateY(0);animation:cardIn var(--dur-med) var(--motion-standard-decelerate) backwards}
.card+.card{border-top:1px solid var(--outline-variant)}
.card:hover{background:var(--surface-container-low);transform:translateY(-2px);box-shadow:var(--e2)}
.card:active{background:var(--surface-container-high);transition-duration:0s}
.card:hover .card-title{color:var(--primary);transition:color var(--dur-med) var(--motion-standard)}
.card-date{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:12px;color:var(--outline);margin-bottom:3px;font-weight:400}
.card-title{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:18px;font-weight:600;color:var(--on-surface);line-height:1.4;margin-bottom:5px;transition:color var(--dur-fast) var(--motion-standard)}
.card-excerpt{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:14px;color:var(--on-surface-variant);line-height:1.75;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{display:flex;align-items:center;gap:10px}
.tag{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:12px;font-weight:400;color:var(--on-primary-container);background:var(--primary-container);padding:2px 10px;border-radius:var(--shape-s);transition:background var(--dur-fast) var(--motion-standard);cursor:pointer}
.tag:hover{background:var(--surface-container-highest)}
.pin-badge{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:11px;font-weight:600;color:var(--primary);margin-left:12px}
.reading-time{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:12px;color:var(--outline)}

/* ── Pagination ── */
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
.no-results{display:none;text-align:center;padding:40px 0;font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:14px;color:var(--outline)}
.no-results.show{display:block;animation:fadeIn var(--dur-slow) var(--motion-standard) both}
.pagination{display:flex;align-items:center;gap:2px;padding:8px 0 0;visibility:hidden;opacity:0;transition:opacity var(--dur-med) var(--motion-standard),visibility var(--dur-med) var(--motion-standard);overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none;justify-content:center;-webkit-overflow-scrolling:touch}
.pagination::-webkit-scrollbar{display:none}
.pagination.show{visibility:visible;opacity:1}
.pg-btn{min-width:36px;height:36px;border-radius:var(--shape-full);border:none;background:none;color:var(--on-surface-variant);font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;font-weight:400;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;transition:color var(--dur-med) var(--motion-standard),background var(--dur-med) var(--motion-standard);position:relative;overflow:hidden;padding:0 4px;flex-shrink:0}
.pg-btn:hover:not(:disabled){background:var(--surface-container-high);transform:scale(1.08)}
.pg-btn:active:not(:disabled){transition-duration:60ms}
.pg-btn.active{background:var(--primary-container);color:var(--on-primary-container);font-weight:600}
.pg-btn:disabled{opacity:.3;cursor:default;pointer-events:none}
.pg-btn svg{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}

/* ── Tags Grid ── */
@keyframes fadeUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.tags-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}
.tag-card{padding:14px 18px;background:var(--surface-container-lowest);border-radius:var(--shape-m);border:1px solid var(--outline-variant);cursor:pointer;transition:transform 180ms var(--motion-standard);position:relative;overflow:hidden;opacity:0;contain:content}
#pageTags.active .tag-card{animation:fadeUp var(--dur-slow) var(--motion-standard) var(--sd,0ms) both}
.tag-card:hover{border-color:var(--primary);box-shadow:var(--e2);transform:translateY(-3px)}
.tag-card:active{transition-duration:60ms}
.tag-card-name{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:14px;font-weight:400;color:var(--on-surface);margin-bottom:2px}
.tag-card-count{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:12px;color:var(--outline)}

/* ── Categories Grid ── */
.cats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
.cat-card{padding:20px 22px;background:var(--surface-container-lowest);border-radius:var(--shape-m);border:1px solid var(--outline-variant);cursor:pointer;transition:transform 180ms var(--motion-standard);position:relative;overflow:hidden;opacity:0}
#pageCategories.active .cat-card{animation:fadeUp var(--dur-slow) var(--motion-standard) var(--sd,0ms) both}
.cat-card:hover{border-color:var(--primary);box-shadow:var(--e2);transform:translateY(-3px)}
.cat-card:active{transition-duration:60ms}
.cat-dot{width:8px;height:8px;border-radius:50%;margin-bottom:10px}
.cat-name{font-family:'Cormorant Garamond',Georgia,serif;font-size:20px;font-weight:400;color:var(--on-surface);margin-bottom:5px}
.cat-desc{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;color:var(--on-surface-variant);line-height:1.6;margin-bottom:8px}
.cat-count{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:12px;color:var(--outline)}

/* ── Archive ── */
.archive-timeline{padding-bottom:20px;padding-left:48px;position:relative}
.archive-timeline::before{content:'';position:absolute;left:18px;top:0;width:1px;height:100%;background:var(--outline-variant);transform:scaleY(0);transform-origin:top;transition:transform .8s var(--motion-standard)}
.archive-timeline.grow::before{transform:scaleY(1)}
.archive-year-group{margin-bottom:32px}
.archive-year-label{font-family:'Cormorant Garamond',Georgia,serif;font-size:clamp(32px,6vw,48px);font-weight:300;color:var(--on-surface);letter-spacing:.02em;padding:24px 0 16px 12px;line-height:1.1;border-bottom:1px solid var(--outline-variant);margin-bottom:12px;display:flex;align-items:baseline;gap:12px}
.archive-year-count{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;font-weight:400;color:var(--outline)}
@keyframes archiveReveal{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}
.archive-card{display:flex;align-items:center;gap:16px;padding:14px 16px;cursor:pointer;border-radius:var(--shape-m);opacity:0;position:relative;overflow:hidden;transition:transform 200ms var(--motion-standard);border:1px solid var(--outline-variant);margin-bottom:8px}
#pageArchive.active .archive-card{animation:fadeUp var(--dur-slow) var(--motion-standard) var(--arch-d,0ms) both}
.archive-card:hover{border-color:var(--primary);box-shadow:var(--e2);transform:translateY(-3px)}
.archive-card:active{transition-duration:60ms}
.archive-card-date{display:flex;flex-direction:column;align-items:center;min-width:48px;flex-shrink:0}
.archive-card-month{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:10px;font-weight:600;color:var(--primary);letter-spacing:.06em;text-transform:uppercase;line-height:1}
.archive-card-day{font-family:'Cormorant Garamond',Georgia,serif;font-size:24px;font-weight:300;color:var(--on-surface);line-height:1.2}
.archive-card-body{flex:1;min-width:0}
.archive-card-title{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:15px;font-weight:500;color:var(--on-surface);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;transition:color 150ms;line-height:1.4}
.archive-card:hover .archive-card-title{color:var(--primary)}
.archive-card-meta{display:flex;align-items:center;gap:8px;margin-top:4px}
.archive-card-tag{font-family:'JetBrains Mono','SF Mono',monospace;font-size:10px;font-weight:400;color:var(--primary);background:var(--primary-container);padding:2px 8px;border-radius:4px;letter-spacing:.04em}
.archive-card-rt{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:12px;color:var(--outline)}

/* ── Friends Grid ── */
.fl-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:12px}
.fl-card{display:flex;align-items:center;gap:14px;padding:16px 20px;background:var(--surface-container-lowest);border-radius:var(--shape-m);border:1px solid var(--outline-variant);cursor:pointer;transition:transform 180ms var(--motion-standard);text-decoration:none;color:inherit;opacity:0;overflow:hidden}
#pageFriends.active .fl-card{animation:fadeUp var(--dur-slow) var(--motion-standard) var(--sd,0ms) both}
.fl-card:hover{border-color:var(--primary);box-shadow:var(--e2);transform:translateY(-3px)}
.fl-card:active{transform:scale(.97);transition-duration:60ms}
@media(max-width:768px){.fl-card{-webkit-tap-highlight-color:rgba(0,0,0,.06);transition:border-color 200ms}[data-theme="dark"] .fl-card{-webkit-tap-highlight-color:rgba(255,255,255,.08)}}
.fl-avatar{width:48px;height:48px;border-radius:50%;object-fit:cover;flex-shrink:0;background:var(--surface-container);border:1px solid var(--outline-variant)}
.fl-info{flex:1;min-width:0}
.fl-name{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:15px;font-weight:600;color:var(--on-surface);margin-bottom:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.fl-desc{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;color:var(--on-surface-variant);line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ── About ── */
.about-center{text-align:center;padding:40px 0 28px}
/* About: staggered block reveal when the page becomes active */
@keyframes aboutReveal{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}
#pageAbout.active .about-center>*{animation:aboutReveal var(--dur-med) var(--motion-standard-decelerate) both}
#pageAbout.active .about-center>*:nth-child(1){animation-delay:20ms}
#pageAbout.active .about-center>*:nth-child(2){animation-delay:70ms}
#pageAbout.active .about-center>*:nth-child(3){animation-delay:120ms}
#pageAbout.active .about-center>*:nth-child(4){animation-delay:170ms}
#pageAbout.active .about-center>*:nth-child(5){animation-delay:220ms}
#pageAbout.active .about-center>*:nth-child(6){animation-delay:270ms}
#pageAbout.active .about-center>*:nth-child(7){animation-delay:320ms}
#pageAbout.active .about-center>*:nth-child(8){animation-delay:370ms}
#pageAbout.active .about-center>*:nth-child(9){animation-delay:420ms}
#pageAbout.active .about-center>*:nth-child(10){animation-delay:470ms}
#pageAbout.active .about-center>*:nth-child(11){animation-delay:520ms}
#pageAbout.active .about-center>*:nth-child(12){animation-delay:570ms}
.about-mono{width:72px;height:72px;border-radius:36px;background:var(--primary-container);display:flex;align-items:center;justify-content:center;margin:0 auto 16px;overflow:hidden}
.about-mono img{width:100%;height:100%;object-fit:cover}
[data-theme="dark"] .about-mono{background:#D4DDE3}
.about-center h1{font-family:'LXGW WenKai','Noto Serif SC','Songti SC','SimSun',serif;font-size:28px;font-weight:300;letter-spacing:.1em;color:var(--on-surface);margin-bottom:6px}
.about-tagline{font-family:'LXGW WenKai','Noto Serif SC','Songti SC','SimSun',serif;font-size:14px;color:var(--primary);margin-bottom:24px;line-height:1.7}
.about-bio{max-width:460px;margin:0 auto;text-align:left}
.about-bio p{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:15px;line-height:1.85;color:var(--on-surface-variant);margin-bottom:12px}
.about-divider{width:36px;height:1px;background:var(--outline-variant);margin:24px auto}
.about-section-title{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.12em;color:var(--outline);margin-bottom:14px}
.about-skill-list{display:flex;flex-wrap:wrap;justify-content:center;gap:8px}
.about-skill{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;font-weight:400;padding:4px 14px;border-radius:var(--shape-s);border:1px solid var(--outline-variant);color:var(--on-surface-variant);background:var(--surface-container-lowest);transition:border-color 200ms;cursor:default;position:relative;overflow:hidden}
.about-skill:hover{border-color:var(--primary);color:var(--primary)}
.about-stats{display:flex;justify-content:center;gap:36px}
.about-stat{text-align:center}
.about-stat-num{display:block;font-family:'Cormorant Garamond',Georgia,serif;font-size:28px;font-weight:300;color:var(--on-surface);line-height:1.2}
.about-stat-label{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:12px;color:var(--outline)}
.about-links{display:flex;justify-content:center;gap:8px;flex-wrap:wrap}
.about-link{padding:6px 16px;border-radius:var(--shape-full);border:1px solid var(--outline-variant);font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;font-weight:400;color:var(--on-surface-variant);cursor:pointer;background:none;transition:transform 200ms var(--motion-standard);position:relative;overflow:hidden}
.about-link:hover{border-color:var(--primary);color:var(--primary);transform:translateY(-2px)}
.about-link:active{transition-duration:60ms}

/* ── Article View ── */
.article-view{position:fixed;inset:0;z-index:200;background:var(--surface);transform:translateY(100%);transition:transform var(--dur-med) var(--motion-standard);overflow-y:auto;overflow-x:hidden;overscroll-behavior:contain;backface-visibility:hidden}
.article-view.open{transform:translateY(0)}
.av-bar{position:sticky;top:0;z-index:10;height:56px;display:flex;align-items:center;padding:0 4px;background:var(--surface)}
.av-bar::after{content:'';position:absolute;inset:0;box-shadow:var(--e1);opacity:0;transition:opacity 150ms;pointer-events:none;z-index:-1}
.av-bar.scrolled::after{opacity:1}
.toc-toggle{display:none}
.rprog{height:2px;background:var(--primary);width:100%;transform:scaleX(0);transform-origin:left;position:sticky;top:56px;z-index:9}
.av-content{max-width:720px;margin:0 auto;padding:0 24px 120px;overflow-x:hidden}
.article-header{padding:28px 0 16px}
.si{opacity:1;transform:none}
.art-meta{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;color:var(--outline);display:flex;align-items:center;gap:8px;margin-bottom:10px;font-weight:400}
.article-header h1{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:clamp(24px,4vw,32px);font-weight:600;color:var(--on-surface);line-height:1.3;margin-bottom:10px}
.art-tags{display:flex;gap:8px;flex-wrap:wrap}
.art-div{width:100%;height:1px;background:var(--outline-variant);margin-top:16px}

/* ── Skeleton Loader ── */
.skel-wrap{padding:28px 0}
@keyframes skelShimmer{0%{transform:translateX(-100%)}100%{transform:translateX(100%)}}
.skel-line{height:14px;border-radius:6px;margin-bottom:12px;background:var(--surface-container-high);position:relative;overflow:hidden}
.skel-line::after{content:'';position:absolute;inset:0;background:linear-gradient(90deg,transparent 0,var(--surface-container) 40%,transparent 80%);animation:skelShimmer 1.6s ease-in-out infinite}
.skel-w60{width:60%}.skel-w70{width:70%}.skel-w75{width:75%}.skel-w80{width:80%}.skel-w85{width:85%}.skel-w90{width:90%}.skel-w95{width:95%}.skel-w100{width:100%}
.skel-gap{height:24px}

/* ── Article Body ── */
.article-body{padding-bottom:100px;overflow-x:hidden;opacity:0}
.article-body.revealed{opacity:1;transition:opacity var(--dur-med) var(--motion-standard)}
.article-body h2{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:22px;font-weight:600;color:var(--on-surface);margin:40px 0 14px;scroll-margin-top:72px;letter-spacing:.02em}
.article-body h3{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:17px;font-weight:600;color:var(--on-surface-variant);margin:28px 0 8px;scroll-margin-top:72px}
.article-body p{font-family:'Noto Sans SC','PingFang SC',sans-serif;margin-bottom:14px;font-size:clamp(15px,1.05vw + 10px,17px);line-height:1.75;color:var(--on-surface)}
.article-body strong{font-weight:600}
.article-body code:not([class*="language-"]){font-family:'JetBrains Mono','SF Mono',monospace;font-size:.85em;background:var(--surface-container-high);color:var(--primary);padding:2px 7px;border-radius:var(--shape-xs)}
.article-body blockquote{border-left:3px solid var(--primary);background:var(--surface-container);padding:12px 16px;margin:18px 0;border-radius:0 var(--shape-m) var(--shape-m) 0}
.article-body blockquote p{font-family:'Noto Sans SC','PingFang SC',sans-serif;color:var(--on-surface-variant);margin-bottom:0;font-size:15px;line-height:1.75}
.article-body ul,.article-body ol{margin:10px 0 16px;padding-left:22px}
.article-body li{font-family:'Noto Sans SC','PingFang SC',sans-serif;margin-bottom:4px;font-size:clamp(15px,1.05vw + 10px,17px);line-height:1.8}.article-body li::marker{color:var(--primary)}
.article-body hr{border:none;height:1px;background:var(--outline-variant);margin:28px 0}
.article-body a:not(.toc-link):not(.toc-drawer-item){color:var(--primary);text-decoration:none;border-bottom:1.5px solid var(--primary-container);padding-bottom:1px;transition:border-color 200ms}
.article-body a:not(.toc-link):not(.toc-drawer-item):hover{border-bottom-color:var(--primary)}
.article-body table{width:100%;border-collapse:collapse;margin:18px 0;border-radius:12px;overflow:hidden;border:1px solid var(--outline-variant);font-size:14px;table-layout:fixed;word-break:break-word;word-wrap:break-word}
.article-body th,.article-body td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--outline-variant);word-break:break-word;word-wrap:break-word;overflow-wrap:break-word;hyphens:auto}
.article-body th:not(:last-child),.article-body td:not(:last-child){border-right:1px solid var(--outline-variant)}
.article-body th{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-weight:600;color:var(--on-surface);background:var(--surface-container)}
.article-body td{font-family:'Noto Sans SC','PingFang SC',sans-serif;color:var(--on-surface-variant);line-height:1.6}
.article-body thead tr{border-bottom:2px solid var(--outline-variant)}
.article-body tbody tr:last-child td{border-bottom:none}
.article-body tbody tr:hover{background:var(--surface-container-low)}
.article-body del{color:var(--outline);text-decoration:line-through}

/* ── Mermaid ── */
.mermaid-block{margin:18px 0;padding:16px;background:var(--surface-container-low);border:1px solid var(--outline-variant);border-radius:var(--shape-m);overflow:hidden;text-align:center;-webkit-overflow-scrolling:touch;position:relative}
.mermaid-block svg{max-width:100%;height:auto;display:inline-block;cursor:pointer;touch-action:auto}
.mermaid-block svg text{-webkit-user-select:text;user-select:text;cursor:text;-webkit-tap-highlight-color:transparent}
.mermaid-block svg text::selection{background:var(--primary-container);color:var(--on-primary-container)}
.mermaid-block svg text::-moz-selection{background:var(--primary-container);color:var(--on-primary-container)}
.mermaid-block.zoomed svg{touch-action:none;cursor:grab}
.mermaid-zoom-btn{width:28px;height:28px;border-radius:6px;border:1px solid var(--outline-variant);background:var(--surface);color:var(--on-surface-variant);cursor:pointer;display:flex;align-items:center;justify-content:center;opacity:0.7;transition:opacity 200ms,transform 100ms}
.mermaid-zoom-btn:hover{opacity:1}
.mermaid-zoom-btn:active{}
.mermaid-zoom-btn svg{width:14px;height:14px;stroke:currentColor;fill:none;stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round}
.mermaid-zoom-panel{position:absolute;top:8px;right:8px;z-index:5;display:flex;flex-direction:column;gap:4px;opacity:0.5;transition:opacity 200ms}
.mermaid-zoom-panel:hover{opacity:1}
.mermaid-block.zoomed{overflow:hidden}
.mermaid-block.zoomed .mermaid-zoom-btn{opacity:1}
.mermaid-block.zoomed svg.panning{cursor:grabbing}
.mermaid-block.mod-ctrl svg{cursor:zoom-in}
.mermaid-block.mod-shift svg{cursor:zoom-out}
.mermaid-block.mod-alt svg,.mermaid-block.mod-alt svg text{cursor:text;-webkit-user-select:text;user-select:text}
.mermaid-block.mod-alt,.mermaid-block:not(.zoomed){user-select:text;-webkit-user-select:text}
.mermaid-loading{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;color:#8E9196;padding:20px 0}

/* ── MD TOC ── */
.md-toc{background:var(--surface-container);border:1px solid var(--outline-variant);border-radius:var(--shape-m);padding:16px 20px;margin:18px 0}
.md-toc .toc-title{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.12em;color:var(--outline);margin-bottom:12px}
.toc-auto-list{list-style:none;padding:0;margin:0}
.toc-auto-list li{padding:3px 0}
.toc-auto-list li a{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:14px;color:var(--on-surface-variant);text-decoration:none;transition:color 150ms}
.toc-auto-list li a:hover{color:var(--primary)}
.toc-auto-list li.sub{padding-left:20px}
.footnote-ref a{color:var(--primary);text-decoration:none;font-size:12px;cursor:pointer}
.footnote-ref a:hover{text-decoration:underline}
.footnotes{margin-top:32px;padding-top:16px;border-top:1px solid var(--outline-variant)}
.footnotes ol{padding-left:20px}
.footnotes li{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:14px;color:var(--on-surface-variant);line-height:1.7;margin-bottom:4px}
.footnote-backref{color:var(--primary);text-decoration:none;margin-left:4px;cursor:pointer}
.math-block{margin:18px 0;overflow-x:auto}

/* ── Article Nav ── */
.art-nav{display:flex;gap:12px;padding:28px 0 0;margin-top:28px;border-top:1px solid var(--outline-variant);transition:opacity var(--dur-med) var(--motion-standard),transform var(--dur-med) var(--motion-standard)}

.art-nav:empty{display:none;padding:0;margin:0;border:none}
.art-nav-btn{flex:1;display:flex;align-items:center;gap:14px;padding:18px 20px;min-height:76px;border:1px solid var(--outline-variant);border-radius:var(--shape-m);background:var(--surface-container-lowest);cursor:pointer;text-align:left;position:relative;overflow:hidden;transition:transform 220ms var(--motion-standard)}
.art-nav-btn:hover{border-color:var(--primary);transform:translateY(-4px);box-shadow:var(--e2)}
.art-nav-btn:active{transform:translateY(0) scale(.97);transition-duration:60ms}
.art-nav-btn.next{justify-content:flex-end}
.art-nav-icon{flex-shrink:0;width:36px;height:36px;border-radius:var(--shape-full);background:var(--primary-container);display:flex;align-items:center;justify-content:center;color:var(--on-primary-container);transition:background 200ms,color 200ms,transform 150ms}
.art-nav-btn:hover .art-nav-icon{background:var(--primary);color:var(--on-primary)}
.art-nav-btn.prev:hover .art-nav-icon{transform:translateX(-3px)}
.art-nav-btn.next:hover .art-nav-icon{transform:translateX(3px)}
.art-nav-icon svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.art-nav-info{flex:1;min-width:0}
.art-nav-label{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:11px;font-weight:400;color:var(--outline);letter-spacing:.06em;margin-bottom:3px}
.art-nav-title{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:14px;font-weight:600;color:var(--on-surface);line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ── Code Blocks ── */
.code-block{border-radius:var(--shape-m);overflow:hidden;margin:18px 0;background:var(--cb-bg);border:1px solid var(--outline-variant)}
.cb-bar{display:flex;align-items:center;justify-content:space-between;padding:0 4px 0 16px;height:38px;background:var(--cb-bar-bg);border-bottom:1px solid var(--cb-bar-border)}
.cb-lang{font-family:'JetBrains Mono','SF Mono',monospace;font-size:10px;color:rgba(255,255,255,.35);text-transform:uppercase;letter-spacing:.06em}
.cb-copy{width:36px;height:36px;border-radius:var(--shape-full);border:none;background:none;color:var(--cb-line);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:background 150ms,color 150ms;position:relative;overflow:hidden}
.cb-copy:hover{background:var(--cb-bar-bg);color:var(--cb-text)}.cb-copy.copied{color:#80CBC4}
.cb-copy svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.cb-body{display:flex;background:var(--cb-bg);overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:thin;scrollbar-color:var(--cb-scroll-thumb) var(--cb-scroll-track)}
.cb-body::-webkit-scrollbar{width:6px;height:6px}
.cb-body::-webkit-scrollbar-track{background:var(--cb-scroll-track)}
.cb-body::-webkit-scrollbar-thumb{background:var(--cb-scroll-thumb);border-radius:3px}
.cb-lines{flex-shrink:0;padding:19px 16px 19px 12px;text-align:right;user-select:none;-webkit-user-select:none;position:sticky;left:0;background:var(--cb-bg);z-index:1}
.cb-lines span{display:block;font-family:'JetBrains Mono','SF Mono',monospace;font-size:14px;line-height:1.65;color:var(--cb-line);font-variant-numeric:tabular-nums}
.cb-sep{flex-shrink:0;width:1px;background:var(--cb-bar-border);align-self:stretch}
.cb-pre-wrap{flex:1;min-width:0}
.cb-pre-wrap pre[class*="language-"]{margin:0!important;padding:19px 20px!important;background:transparent!important;border:none!important;border-radius:0!important;font-family:'JetBrains Mono','SF Mono','Fira Code','Noto Sans SC',monospace!important;font-size:14px!important;line-height:1.65!important;white-space:pre!important;word-wrap:normal!important;overflow:visible!important}
.cb-pre-wrap code[class*="language-"]{font-family:'JetBrains Mono','SF Mono','Fira Code','Noto Sans SC',monospace!important;font-size:14px!important;line-height:1.65!important;background:none!important;padding:0!important;color:var(--cb-text)!important;white-space:pre!important;word-wrap:normal!important}

/* ── Search ── */
.search-view{position:fixed;inset:0;z-index:300;background:var(--surface);transform:translateY(-100%);transition:transform var(--dur-med) var(--motion-standard);display:flex;flex-direction:column;overscroll-behavior:contain;backface-visibility:hidden}
.search-view.open{transform:translateY(0)}
.sv-bar{height:56px;display:flex;align-items:center;padding:0 8px;gap:4px;flex-shrink:0;background:var(--surface);transition:background-color 200ms;border-bottom:1px solid var(--outline-variant)}
.sv-input{flex:1;min-width:0;height:100%;background:none;border:none;outline:none;font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:18px;font-weight:400;color:var(--on-surface);padding:0 12px;box-shadow:none;-webkit-appearance:none;appearance:none}
.sv-input:focus{outline:none;border:none;box-shadow:none;-webkit-appearance:none}
#svBack,#svClear{outline:none;border:none}
#svBack:focus,#svClear:focus,#svBack:focus-visible,#svClear:focus-visible{outline:none;border:none}
.sv-input::placeholder{color:var(--outline)}
.sv-results{flex:1;overflow-y:auto;padding:12px 20px 20px;background:var(--surface);scrollbar-width:none;-ms-overflow-style:none}
.sv-results::-webkit-scrollbar{display:none}
.sv-hint{padding:40px 12px;text-align:center;font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;color:var(--outline)}
@keyframes svItemIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
.sv-item{padding:12px 16px;border-radius:var(--shape-m);cursor:pointer;transition:background var(--dur-fast) var(--motion-standard);margin-bottom:2px;opacity:0;animation:svItemIn var(--dur-med) var(--motion-standard-decelerate) var(--sd,0ms) both}
.sv-item:hover{background:var(--surface-container)}
.sv-item-active{background:var(--surface-container-high)!important}
.sv-item-tag{font-family:'JetBrains Mono','SF Mono',monospace;font-size:10px;letter-spacing:.12em;text-transform:uppercase;font-weight:400;color:var(--primary);margin-bottom:4px}
.sv-item-title{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:16px;font-weight:600;color:var(--on-surface);margin-bottom:2px}
.sv-item-excerpt{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;color:var(--on-surface-variant);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.6}
.sv-no-results{padding:40px 12px;text-align:center;font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;color:var(--outline);animation:fadeIn var(--dur-slow) var(--motion-standard) both}
.hl-match{background:var(--primary-container);color:var(--on-primary-container);border-radius:2px;padding:0 2px}

/* ── TOC Sidebar ── */
.toc{position:fixed;top:88px;right:max(calc((100vw - 720px)/2 - 230px),24px);width:190px;max-height:calc(100vh - 140px);overflow-y:auto;z-index:210;opacity:0;transform:translateX(12px);pointer-events:none;scrollbar-width:none;transition:opacity var(--dur-med) var(--motion-standard),transform var(--dur-med) var(--motion-standard)}
.toc::-webkit-scrollbar{display:none}
.toc.visible{opacity:1;transform:none;pointer-events:auto}
.toc-title{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.12em;color:var(--outline);margin-bottom:16px}
.toc-list{list-style:none;padding:0}
.toc-item{padding:4px 0;cursor:pointer;font-weight:400;transform-origin:left center}
.toc-item+.toc-item{margin-top:2px}.toc-item.active{transform:scale(1.04)}
.toc-link{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;color:var(--outline);line-height:1.45;display:block;transition:color 200ms}
.toc-item.active .toc-link{color:var(--primary);font-weight:600}.toc-link:hover{color:var(--on-surface)}
.toc-link.sub{padding-left:14px;font-size:12px;opacity:.6}.toc-item.active .toc-link.sub{opacity:1}

/* ── TOC Drawer (mobile) ── */
.toc-sheet{position:fixed;inset:0;z-index:220;pointer-events:none;display:flex;align-items:flex-end}
.toc-sheet.open{pointer-events:auto}
.toc-scrim{position:absolute;inset:0;background:rgba(0,0,0,.32);opacity:0;transition:opacity var(--dur-med) var(--motion-standard)}
.toc-sheet.open .toc-scrim{opacity:1}
.toc-drawer{position:relative;width:100%;max-height:60vh;background:var(--surface-container-low);border-radius:var(--shape-xl) var(--shape-xl) 0 0;padding:12px 0 28px;transform:translateY(100%);transition:transform var(--dur-med) var(--motion-standard-decelerate);display:flex;flex-direction:column}
.toc-sheet.open .toc-drawer{transform:translateY(0)}
.toc-drawer-handle{width:32px;height:4px;border-radius:2px;background:var(--outline-variant);margin:0 auto 8px;flex-shrink:0}
.toc-drawer-title{padding:8px 24px 12px;font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:14px;font-weight:600;color:var(--on-surface);flex-shrink:0}
.toc-drawer-list{list-style:none;padding:0 0 4px;overflow-y:auto;-webkit-overflow-scrolling:touch;flex:1}
.toc-drawer-item{display:block;padding:14px 24px;font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:14px;color:var(--on-surface-variant);cursor:pointer;transition:background 150ms,color 150ms}
.toc-drawer-item:hover,.toc-drawer-item:active{background:var(--surface-container-high)}
.toc-drawer-item.sub{padding-left:48px;font-size:13px;opacity:.8}
.toc-drawer-item.active{color:var(--primary);font-weight:600}

/* ── FAB ── */
.fab{position:fixed;bottom:24px;right:24px;width:56px;height:56px;border-radius:var(--shape-l);border:none;background:var(--surface-container-high);color:var(--on-surface);cursor:pointer;z-index:250;display:flex;align-items:center;justify-content:center;box-shadow:var(--e3);transform:scale(0);opacity:0;transition:transform var(--dur-med) var(--motion-standard),opacity var(--dur-fast) var(--motion-standard),background var(--dur-fast) var(--motion-standard)}
.fab.visible{transform:scale(1);opacity:1}
.fab-comment{bottom:24px;background:var(--surface-container-high);color:var(--on-surface);transition:transform var(--dur-med) var(--motion-standard),opacity var(--dur-fast) var(--motion-standard),background var(--dur-fast) var(--motion-standard),color var(--dur-fast) var(--motion-standard),bottom var(--dur-med) var(--motion-standard-decelerate)}
.fab-comment:hover{background:var(--surface-container-highest)}
.fab-comment.shifted{bottom:92px}
.fab.idle{opacity:0;pointer-events:none;transition:opacity var(--dur-slow) var(--motion-standard)}
@media(max-width:768px){.fab-comment{bottom:20px;width:48px;height:48px;border-radius:var(--shape-m)}.fab-comment.shifted{bottom:80px}}
.fab:hover{background:var(--surface-container-highest)}
.fab svg{width:24px;height:24px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}

/* ── Ripple ── */
.ripple{position:absolute;border-radius:50%;background:var(--ripple);pointer-events:none;z-index:2;animation:ripExpand var(--dur-slow) var(--motion-standard-decelerate) forwards}
@keyframes ripExpand{0%{transform:scale(0);opacity:1}100%{transform:scale(4);opacity:0}}

/* ── Comment & Footer ── */
.comment-section{margin-top:32px;padding-top:24px;border-top:1px solid var(--outline-variant)}
.comment-section:empty{display:none}
.site-footer{border-top:1px solid var(--outline-variant);padding:16px 24px;text-align:center;background:var(--surface-container-low)}
.footer-nav{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;margin-bottom:8px}
.footer-link{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;font-weight:400;color:var(--on-surface-variant);cursor:pointer;transition:color 200ms;padding:8px 4px;min-height:44px;display:inline-flex;align-items:center;border-radius:var(--shape-full);position:relative;overflow:hidden}
.footer-link:hover{color:var(--primary)}
.footer-copy{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:12px;color:var(--outline)}

/* ── Reduced Motion ── */
@media(prefers-reduced-motion:reduce){
  .ripple,.card,.tag-card,.cat-card,.fl-card,.archive-card,.sv-item,.page.slide-in-right,.page.slide-in-left,.hero h1,.hero p,.filter-bar.on,.no-results.show,.skel-line::after,.about-center>*{animation:none!important}
  .si,.article-body>*,.toc,.toc-drawer,.toc-scrim,.search-view,.article-view,.fab,.fab-comment,.tab-bar,.rprog,.card,.tag-card,.cat-card,.fl-card,.archive-card,.icon-btn,.art-nav-btn,.pg-btn,.sv-item,.footer-link,.about-link{transition:none!important}
  .lightbox-img,.lightbox{transition:none!important}
}

/* ── Responsive ── */
@media(max-width:1200px){.toc{display:none}.toc-toggle{display:flex}}
@media(max-width:768px){
  .page.slide-in-right,.page.slide-in-left,.page.slide-out-left,.page.slide-out-right{animation:none!important}
  /* 移动端放开首页卡片的交错入场 animation（保留 reduced-motion 下的 429 行禁用保护） */
  .card.show{opacity:1;transform:translateY(0)}
  .mermaid-block svg,.mermaid-block svg text{-webkit-user-select:text;user-select:text;touch-action:auto}
  .mermaid-block.zoomed svg{touch-action:none}
  .mermaid-block svg text::selection{background:var(--primary-container);color:var(--on-primary-container)}
  .mermaid-block svg text::-moz-selection{background:var(--primary-container);color:var(--on-primary-container)}
  .mermaid-block:not(.zoomed){-webkit-user-select:text;user-select:text}
  .top-app-bar{padding:0 4px 0 16px}.page-tabs .tab{padding:14px 10px;font-size:12px}
  .container{padding:0 16px}
  .av-content{padding:0 16px 120px}
  .page{padding-bottom:16px}
  .hero{padding:28px 0 20px}.hero h1{font-size:30px}
  .page-hero{padding:24px 0 14px}.page-hero h1{font-size:26px}
  .card{padding:14px 16px}.card-title{font-size:16px}.card-excerpt{font-size:13px}
  .article-header h1{font-size:24px}
  .article-body h2{font-size:20px;margin-top:32px}.article-body h3{font-size:16px}
  .art-nav{gap:8px}.art-nav-btn{padding:14px 12px;min-height:60px;gap:10px}
  .art-nav-title{font-size:13px;-webkit-line-clamp:1}.art-nav-icon{width:32px;height:32px}
  .art-nav-icon svg{width:16px;height:16px}
  .archive-timeline{padding-left:44px}.archive-timeline::before{left:14px}
  .archive-year-label{padding:32px 0 6px 12px}
  .cb-lines{padding:14px 12px 14px 8px}.cb-lines span{font-size:12px;line-height:1.6}
  .cb-pre-wrap pre[class*="language-"]{padding:14px 14px!important;font-size:12px!important;line-height:1.6!important}
  .cb-pre-wrap code[class*="language-"]{font-size:12px!important;line-height:1.6!important}
  .fab{bottom:20px;right:20px;width:48px;height:48px;border-radius:14px}
  .sv-input{font-size:16px}.tags-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}
  .cats-grid{grid-template-columns:1fr}
  .fl-grid{grid-template-columns:1fr;gap:10px}
  .fl-card{padding:14px 16px;gap:12px}
  .fl-avatar{width:40px;height:40px}
  .filter-bar{margin-top:8px}
  #pageArticles .hero{display:none}
}
@media(max-width:480px){
  .hero{padding:24px 0 16px}.hero h1{font-size:26px}
  .card-title{font-size:15px}.article-header h1{font-size:22px}
  .article-body h2{font-size:18px}
  .art-nav{gap:6px}.art-nav-btn{padding:12px 10px;min-height:54px;gap:8px}
  .art-nav-title{font-size:12px}.art-nav-label{font-size:10px}
  .cb-lines{padding:12px 8px 12px 6px}.cb-lines span{font-size:11px;line-height:1.55}
  .cb-pre-wrap pre[class*="language-"]{padding:12px 12px!important;font-size:11px!important;line-height:1.55!important}
  .cb-pre-wrap code[class*="language-"]{font-size:11px!important;line-height:1.55!important}
  .tags-grid{grid-template-columns:repeat(2,1fr);gap:8px}
}

/* ── Print ── */
@media print{
  .top-app-bar,.page-tabs,.fab,.site-footer,.toc,.toc-sheet,.search-view,.art-nav,.rprog,.toc-toggle{display:none!important}
  .article-view{position:static!important;transform:none!important;overflow:visible!important}
  .article-body>*{opacity:1!important;transform:none!important}
  .si{opacity:1!important;transform:none!important}
  body{background:#fff!important;color:#000!important}
  a{color:#000!important;text-decoration:underline!important}
  .code-block{break-inside:avoid}
}

/* ── Focus ── */
:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.icon-btn:focus-visible,.fab:focus-visible,.tab:focus-visible,.pg-btn:focus-visible,.filter-clear:focus-visible,.art-nav-btn:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:inherit}
.card:focus-visible,.tag-card:focus-visible,.cat-card:focus-visible,.fl-card:focus-visible,.archive-card:focus-visible,.about-link:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.toc-item:focus-visible,.toc-drawer-item:focus-visible,.sv-item:focus-visible,.footer-link:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
:focus:not(:focus-visible){outline:none}

/* Task list */
.task-item{list-style:none;position:relative;padding-left:6px}
.task-item input[type="checkbox"]{margin-right:8px;accent-color:var(--primary);vertical-align:middle}
.task-item.checked{color:var(--on-surface-variant);text-decoration:line-through;opacity:.7}
.task-item.checked code{text-decoration:none}

/* Inline math */
.math-inline{font-style:italic;color:var(--on-surface-variant)}
.math-block{overflow-x:auto;padding:12px 0;font-style:italic;color:var(--on-surface-variant)}

/* ── Lightbox (Material Design 3) ── */
.lightbox{visibility:hidden;opacity:0;position:fixed;inset:0;z-index:999;display:flex;align-items:center;justify-content:center;transition:visibility var(--dur-med),opacity var(--dur-med) var(--motion-standard)}
.lightbox.open{visibility:visible;opacity:1}
.lightbox-scrim{position:absolute;inset:0;background:rgba(12,14,16,.96);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);z-index:0}
/* — Central glass card holding the image + caption — */
.lb-panel{position:relative;z-index:10;display:flex;flex-direction:column;align-items:center;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);border-radius:var(--shape-l);backdrop-filter:blur(14px) saturate(1.2);-webkit-backdrop-filter:blur(14px) saturate(1.2);box-shadow:0 8px 32px rgba(0,0,0,.4),0 24px 80px rgba(0,0,0,.45);padding:12px}
.lightbox-toolbar{position:absolute;top:12px;left:12px;right:12px;height:56px;display:flex;align-items:center;padding:0 8px 0 16px;z-index:30;pointer-events:none;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:var(--shape-xl);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:var(--e2)}
.lightbox-toolbar>*{pointer-events:auto}
.lightbox-counter{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;font-weight:600;color:rgba(255,255,255,.9);letter-spacing:.03em;padding:0 4px}
.lightbox-close{width:40px;height:40px;border-radius:var(--shape-full);border:none;background:transparent;color:rgba(255,255,255,.9);cursor:pointer;display:flex;align-items:center;justify-content:center;margin-left:auto;flex-shrink:0;transition:background .2s var(--motion-standard);overflow:hidden}
.lightbox-close:hover{background:rgba(255,255,255,.12)}
.lightbox-close:active{background:rgba(255,255,255,.18);transition-duration:60ms}
.lightbox-close svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.lightbox-stage{position:relative;z-index:10;display:flex;align-items:center;justify-content:center;width:100%;height:100%}
.lightbox-img-wrap{position:relative;cursor:zoom-in;user-select:none;-webkit-user-select:none;touch-action:none}
.lightbox-img-wrap.zoomed{cursor:grab}
.lightbox-img-wrap.zoomed.panning{cursor:grabbing}
.lightbox-img-wrap .lb-spinner{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:38px;height:38px;border:3px solid rgba(255,255,255,.2);border-top-color:rgba(255,255,255,.9);border-radius:50%;animation:lbSpin .8s linear infinite;z-index:5}
@keyframes lbSpin{to{transform:translate(-50%,-50%) rotate(360deg)}}
.lightbox-img.loading{visibility:hidden}
.lightbox-img{display:block;max-width:calc(100vw - 128px);max-height:calc(100vh - 160px);width:auto;height:auto;object-fit:contain;border-radius:var(--shape-m);background:#0b0d0f;transition:transform var(--dur-med) var(--motion-standard-decelerate),opacity var(--dur-med) var(--motion-standard);will-change:transform;contain:layout paint}
.lightbox-img.lb-closing{transition:transform var(--dur-med) var(--motion-standard),opacity var(--dur-med) var(--motion-standard);box-shadow:none}
.lightbox-nav{position:absolute;top:50%;transform:translateY(-50%);width:46px;height:46px;border-radius:var(--shape-full);border:1px solid rgba(255,255,255,.12);background:rgba(255,255,255,.08);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);color:rgba(255,255,255,.85);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .2s var(--motion-standard),color .2s,box-shadow .2s;z-index:20;flex-shrink:0;box-shadow:var(--e1)}
.lightbox-nav:hover{background:rgba(255,255,255,.16);color:#fff;box-shadow:var(--e2)}
.lightbox-nav:active{background:rgba(255,255,255,.22);transition-duration:60ms}
.lightbox-nav svg{width:24px;height:24px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.lightbox-prev{left:16px}.lightbox-next{right:16px}
/* — MD3 bottom action bar: frosted pill, capsule counter chip, tonal buttons — */
.lightbox-bottombar{position:absolute;bottom:12px;left:50%;transform:translateX(-50%);height:52px;display:flex;align-items:center;padding:0 8px;z-index:30;pointer-events:none;gap:4px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);border-radius:var(--shape-xl);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:var(--e2)}
.lightbox-bottombar>*{pointer-events:auto}
.lightbox-btn{width:40px;height:40px;border-radius:var(--shape-full);border:none;background:rgba(255,255,255,.06);color:rgba(255,255,255,.85);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .2s var(--motion-standard),color .2s,transform .12s;overflow:hidden;flex-shrink:0}
.lightbox-btn:hover{background:var(--primary-container);color:var(--on-primary-container)}
.lightbox-btn:active{background:color-mix(in srgb,var(--primary-container) 70%,white);transform:scale(.92);transition-duration:60ms}
.lightbox-btn svg{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.lightbox-bottombar .spacer{width:8px;flex:none}
/* — Caption: independently styled pill, fully resolved from glass card, no washout — */
.lb-caption{position:absolute;left:50%;transform:translateX(-50%);bottom:78px;z-index:35;pointer-events:none;display:none;max-width:min(80vw,560px);text-align:center;padding:10px 20px;font-size:14px;line-height:1.55;color:rgba(255,255,255,.96);background:rgba(24,26,28,.72);border:1px solid rgba(255,255,255,.12);border-radius:var(--shape-xl);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:var(--e1);font-family:'Noto Sans SC','PingFang SC',sans-serif;word-break:break-word}
.lb-caption:empty{display:none!important}
@media(max-width:640px){.lb-caption{bottom:74px;font-size:13px;padding:8px 16px;max-width:86vw}}
.zoom-indicator{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(.8);background:rgba(24,26,28,.78);border:1px solid rgba(255,255,255,.14);color:#fff;font-family:'JetBrains Mono','SF Mono',monospace;font-size:16px;font-weight:600;padding:8px 18px;border-radius:var(--shape-full);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);box-shadow:var(--e2);opacity:0;pointer-events:none;z-index:50;transition:opacity .2s,transform .2s}
.zoom-indicator.show{opacity:1;transform:translate(-50%,-50%) scale(1)}
@keyframes fbSlideOutL{from{opacity:1;transform:translateX(0)}to{opacity:0;transform:translateX(-25%)}}
@keyframes fbSlideOutR{from{opacity:1;transform:translateX(0)}to{opacity:0;transform:translateX(25%)}}
@keyframes fbSlideInR{from{opacity:0;transform:translateX(25%)}to{opacity:1;transform:translateX(0)}}
@keyframes fbSlideInL{from{opacity:0;transform:translateX(-25%)}to{opacity:1;transform:translateX(0)}}
@keyframes lbEnterAnim{from{opacity:0;transform:scale(.92)}to{opacity:1;transform:scale(1)}}
[data-theme="dark"] .article-body img{filter:brightness(.85) contrast(1.05)}
[data-theme="dark"] .img-figure img{mix-blend-mode:luminosity}
[data-theme="dark"] .lightbox-toolbar{background:rgba(30,34,38,.55);border-color:rgba(255,255,255,.08);opacity:1}
[data-theme="dark"] .lightbox-bottombar{background:rgba(30,34,38,.6);border-color:rgba(255,255,255,.08);opacity:1}
[data-theme="dark"] .lb-panel{background:rgba(255,255,255,.05);border-color:rgba(255,255,255,.08);box-shadow:0 8px 32px rgba(0,0,0,.5),0 24px 80px rgba(0,0,0,.55)}
[data-theme="dark"] .lightbox-close{color:rgba(255,255,255,.87)}
[data-theme="dark"] .lightbox-close:hover{background:rgba(255,255,255,.1)}
[data-theme="dark"] .lightbox-counter{color:rgba(255,255,255,.7)}
[data-theme="dark"] .lightbox-btn{color:rgba(255,255,255,.75)}
[data-theme="dark"] .lightbox-btn:hover{background:rgba(255,255,255,.1);color:rgba(255,255,255,.95)}
[data-theme="dark"] .lightbox-nav{background:rgba(255,255,255,.08);color:rgba(255,255,255,.65);opacity:1}
[data-theme="dark"] .lightbox-nav:hover{background:rgba(255,255,255,.15);color:rgba(255,255,255,.95)}
[data-theme="dark"] .lightbox-nav:active{background:rgba(255,255,255,.2)}
@media(max-width:768px){
.lightbox-img{max-width:calc(100vw - 80px);max-height:calc(100vh - 56px);width:auto;height:auto;object-fit:contain}
.lightbox-nav{width:40px;height:40px}.lightbox-nav svg{width:20px;height:20px}
.lightbox-prev{left:4px}.lightbox-next{right:4px}
.lightbox-close{width:44px;height:44px}
.lightbox-toolbar{height:48px;padding:0 4px 0 12px}
.lightbox-bottombar{height:44px;padding:0 8px}
}

/* ── Article Images ── */
.article-body img{cursor:zoom-in;display:block;max-width:100%;height:auto;background:var(--surface-container-high);border-radius:var(--shape-m);margin:18px 0;border:1px solid var(--outline-variant)}
.img-figure{margin:18px 0;text-align:center}
.img-figure img{margin:0 auto}
.img-figure figcaption{font-family:'Noto Sans SC','PingFang SC',sans-serif;font-size:13px;color:var(--outline);line-height:1.6;margin-top:8px;padding:0 8px}