/* ============================================================
   y4ng — working journal · shared stylesheet
   ink-on-paper · serif-led · light default, dark supported
   ============================================================ */

/* ---------- self-hosted coding font: 0xProto ---------- */
@font-face{font-family:"0xProto";font-style:normal;font-weight:400;font-display:swap;
  src:url("fonts/0xProto-Regular.woff2") format("woff2");}
@font-face{font-family:"0xProto";font-style:normal;font-weight:700;font-display:swap;
  src:url("fonts/0xProto-Bold.woff2") format("woff2");}
@font-face{font-family:"0xProto";font-style:italic;font-weight:400;font-display:swap;
  src:url("fonts/0xProto-Italic.woff2") format("woff2");}

/* ---------- tokens ---------- */
:root{
  --paper:#faf9f7;          /* light warm white (user pick) */
  --paper-2:#eae8e1;        /* subtle fill / rails */
  --card:#fbfaf7;           /* raised surface */
  --ink:#1a1f29;            /* deep blue-black */
  --ink-2:#474d59;          /* secondary text */
  --ink-3:#7a808c;          /* tertiary / mono labels */
  --line:rgba(26,31,41,.13);
  --line-2:rgba(26,31,41,.24);
  --accent:#2f3a82;         /* muted indigo-ink */
  --accent-2:#1f2657;

  /* category hues — equal L/C, hue varies (harmonious) */
  --c-code:#41599b;
  --c-ctf:#a35a4e;
  --c-research:#4f8367;
  --c-life:#9a7d44;

  /* English body + display: Newsreader (à la explainers.blog).
     CJK falls through to LXGW WenKai (simplified), so mixed CN/EN body just works. */
  --display:"Newsreader","LXGW WenKai GB","LXGW WenKai","Noto Serif SC",Georgia,serif;
  --serif:"Newsreader","LXGW WenKai GB","LXGW WenKai","Noto Serif SC",Georgia,serif;
  --cn:"LXGW WenKai GB","LXGW WenKai","Noto Serif SC",serif;
  /* UI labels — Latin/digits in Space Mono, any CJK falls through to WenKai
     (Space Mono has no CJK glyphs; without this, Chinese tags / search input /
     summary crumbs / about-page labels drop to a random system font). */
  --mono:"Space Mono","LXGW WenKai GB","LXGW WenKai","Noto Serif SC",ui-monospace,Menlo,monospace;
  /* code — 0xProto for Latin/symbols, CJK in comments falls through to WenKai */
  --code:"0xProto","Space Mono","LXGW WenKai GB","LXGW WenKai","Noto Serif SC",ui-monospace,Menlo,monospace;

  --maxw:1060px;
  --rail:128px;
  --ease:cubic-bezier(.2,.7,.3,1);
}
[data-theme="dark"]{
  --paper:#14171e;
  --paper-2:#1d212a;
  --card:#1b1f27;
  --ink:#e9e7df;
  --ink-2:#aeb3bd;
  --ink-3:#7b818d;
  --line:rgba(233,231,223,.13);
  --line-2:rgba(233,231,223,.24);
  --accent:#9aa6ee;
  --accent-2:#c2caf6;
  --c-code:#7e93cf;
  --c-ctf:#cf9085;
  --c-research:#84b89a;
  --c-life:#c8ab74;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;overflow-x:clip;}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--serif);font-size:18px;line-height:1.6;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  transition:background .5s var(--ease),color .5s var(--ease);
}
a{color:inherit;text-decoration:none;}
::selection{background:var(--accent);color:var(--paper);}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 40px;}

/* ---------- masthead ---------- */
.site-head{position:sticky;top:0;z-index:40;
  background:color-mix(in srgb,var(--paper) 86%,transparent);
  backdrop-filter:blur(10px) saturate(1.1);
  border-bottom:1px solid var(--line);}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;height:74px;}
.brand{display:flex;flex-direction:column;line-height:1;}
.brand b{font-family:var(--display);font-weight:400;font-size:25px;letter-spacing:.005em;}
.brand small{font-family:var(--mono);font-size:11.5px;letter-spacing:.13em;color:var(--ink-3);margin-top:5px;text-transform:uppercase;}
.nav{display:flex;align-items:center;gap:22px;}
.nav a{font-family:var(--mono);font-size:12.5px;letter-spacing:.02em;color:var(--ink-3);transition:color .2s;}
.nav a:hover{color:var(--ink);}
.nav a.on{color:var(--ink);}
.nav a.on::after{content:"";display:block;height:1.5px;background:var(--accent);margin-top:3px;}
.iconbtn{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;
  border:1px solid var(--line);border-radius:9px;color:var(--ink-2);cursor:pointer;background:transparent;
  transition:border-color .2s,color .2s,background .2s;}
.iconbtn:hover{color:var(--ink);border-color:var(--line-2);}
.head-tools{display:flex;align-items:center;gap:10px;margin-left:8px;}
.head-tools .sep{width:1px;height:18px;background:var(--line-2);}
.ico-moon{display:block;}
.ico-sun{display:none;}
[data-theme="dark"] .ico-moon{display:none;}
[data-theme="dark"] .ico-sun{display:block;}

/* ---------- footer ---------- */
.site-foot{border-top:1px solid var(--line);margin-top:120px;}
.site-foot .wrap{padding-top:34px;padding-bottom:50px;
  display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;
  font-family:var(--mono);font-size:11.5px;color:var(--ink-3);letter-spacing:.02em;}
.site-foot .motto{max-width:46ch;line-height:1.7;}
.site-foot a:hover{color:var(--ink);}
.site-foot-links,.site-foot-legal{display:flex;align-items:center;gap:8px;flex-wrap:wrap;}
.site-foot-legal{margin-left:auto;justify-content:flex-end;}
.site-foot .sep{color:var(--line-2);}
.site-foot-legal a{color:var(--ink-2);}
.site-foot-legal a:hover{color:var(--accent);}

/* ---------- category dot/label ---------- */
.cat{display:inline-flex;align-items:center;gap:7px;font-family:var(--mono);
  font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3);}
.cat::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--dot,var(--ink-3));flex:none;}
.cat[data-c="code"]{--dot:var(--c-code);}
.cat[data-c="ctf"]{--dot:var(--c-ctf);}
.cat[data-c="research"]{--dot:var(--c-research);}
.cat[data-c="life"]{--dot:var(--c-life);}

/* ---------- image placeholder (pill-masked) ---------- */
.ph{position:relative;background:var(--paper-2);overflow:hidden;
  background-image:repeating-linear-gradient(135deg,transparent 0 11px,color-mix(in srgb,var(--ink) 6%,transparent) 11px 12px);
  display:flex;align-items:flex-end;}
.ph cap,.ph .cap{display:block;font-family:var(--mono);font-size:11.5px;color:var(--ink-3);
  letter-spacing:.04em;padding:10px 12px;background:color-mix(in srgb,var(--paper) 70%,transparent);}

/* ---------- scroll reveal ---------- */
@media (prefers-reduced-motion:no-preference){
  .reveal{opacity:0;transform:translateY(14px);transition:opacity .7s var(--ease),transform .7s var(--ease);}
  .reveal.in{opacity:1;transform:none;}
}

/* ============================================================
   HOME
   ============================================================ */
.lede{padding:74px 0 8px;max-width:none;}
.lede p{font-family:var(--serif);font-style:italic;font-size:clamp(24px,3vw,33px);
  line-height:1.42;color:var(--ink);max-width:20ch;margin:0;letter-spacing:-.01em;text-wrap:balance;}
.lede .lede-en{font-style:italic;}
.lede .en{display:block;font-style:italic;color:var(--ink-2);font-size:clamp(16px,1.5vw,19px);
  margin-top:20px;max-width:42ch;line-height:1.6;letter-spacing:0;}

.sec-rule{display:flex;align-items:baseline;gap:14px;margin:64px 0 8px;}
.sec-rule h2{font-family:var(--mono);font-size:12.5px;font-weight:700;letter-spacing:.16em;
  text-transform:uppercase;color:var(--ink-2);margin:0;white-space:nowrap;}
.sec-rule .ln{flex:1;height:1px;background:var(--line);}
.sec-rule .ct{font-family:var(--mono);font-size:11.5px;color:var(--ink-3);}

/* featured */
.feat{display:grid;grid-template-columns:1.15fr .85fr;gap:46px;align-items:center;
  padding:30px 0 14px;cursor:pointer;}
.feat .ph{aspect-ratio:4/3;border-radius:26px;align-self:stretch;min-height:280px;}
.featured-cover{display:block;width:100%;height:100%;object-fit:cover;}
.feat-body .cat{margin-bottom:16px;}
.feat-title{font-family:var(--display);font-weight:400;font-size:clamp(34px,4.4vw,52px);
  line-height:1.04;letter-spacing:-.005em;margin:0;color:var(--ink);transition:color .3s var(--ease);}
.feat-title.is-cn{font-family:var(--cn);font-weight:600;line-height:1.18;letter-spacing:0;font-size:clamp(30px,3.8vw,44px);}
.feat:hover .feat-title{color:var(--accent);}
.feat-dek{font-family:var(--serif);font-size:18px;font-style:italic;line-height:1.55;
  color:var(--ink-2);margin:18px 0 0;max-width:40ch;text-wrap:pretty;}
.feat-dek.is-cn{font-family:var(--cn);font-style:normal;font-size:17px;}
.feat-meta{display:flex;align-items:center;gap:14px;margin-top:22px;
  font-family:var(--mono);font-size:11.5px;color:var(--ink-3);letter-spacing:.03em;}
.feat-meta .read::before{content:"·";margin-right:14px;color:var(--line-2);}

/* ledger list */
.ledger{display:flex;flex-direction:column;}
.entry{position:relative;display:grid;grid-template-columns:var(--rail) 1fr;gap:40px;
  padding:38px 0;border-top:1px solid var(--line);text-decoration:none;}
.entry::after{content:"";position:absolute;left:var(--rail);top:0;bottom:0;width:1px;
  background:var(--line);transform:translateX(-20px);}
.entry::before{content:"";position:absolute;inset:0 -20px;border-radius:14px;background:transparent;
  transition:background .25s var(--ease);z-index:-1;}
.entry:hover::before{background:color-mix(in srgb,var(--ink) 3.5%,transparent);}
.rail{display:flex;flex-direction:column;align-items:flex-end;gap:8px;text-align:right;padding-top:7px;}
.rail .date{font-family:var(--mono);font-size:12.5px;color:var(--ink-3);letter-spacing:.02em;
  transition:color .25s var(--ease);}
.entry:hover .rail .date{color:var(--ink);}
.entry-body{min-width:0;}
.entry-body>.cat{display:flex;width:fit-content;margin-bottom:9px;}
.e-title{font-family:var(--display);font-weight:500;font-size:27px;line-height:1.22;
  letter-spacing:-.005em;margin:0;color:var(--ink);transition:color .25s var(--ease);
  display:inline;background-image:linear-gradient(var(--accent),var(--accent));
  background-size:0% 1.5px;background-position:0 99%;background-repeat:no-repeat;
  transition:background-size .35s var(--ease),color .25s var(--ease);padding-bottom:2px;}
.e-title.is-cn{font-family:var(--cn);font-weight:600;font-size:26px;letter-spacing:0;}
.entry:hover .e-title{color:var(--accent);background-size:100% 1.5px;}
.e-dek{font-family:var(--serif);font-size:16px;line-height:1.58;color:var(--ink-2);
  margin:11px 0 0;max-width:54ch;text-wrap:pretty;}
.e-dek.is-cn{font-family:var(--cn);font-size:16px;}
.arrow{position:absolute;right:2px;top:40px;font-family:var(--mono);font-size:18px;color:var(--accent);
  opacity:0;transform:translateX(-8px);transition:all .28s var(--ease);}
.entry:hover .arrow{opacity:1;transform:none;}

.more-row{display:flex;justify-content:center;margin-top:46px;}
.more-row a{font-family:var(--mono);font-size:12.5px;letter-spacing:.04em;color:var(--ink-2);
  border:1px solid var(--line-2);border-radius:999px;padding:11px 26px;transition:all .2s;}
.more-row a:hover{color:var(--accent);border-color:var(--accent);}

/* ---------- responsive ---------- */
@media (max-width:820px){
  .wrap{padding:0 24px;}
  .feat{grid-template-columns:1fr;gap:24px;}
  .feat .ph{order:-1;min-height:200px;}
  .entry{grid-template-columns:1fr;gap:8px;}
  .entry::after{display:none;}
  .rail{flex-direction:row;align-items:center;justify-content:flex-start;gap:12px;text-align:left;}
  .arrow{display:none;}
}

/* ============================================================
   ARCHIVE · SEARCH · ABOUT
   ============================================================ */
.page-head{padding:74px 0 0;}
.page-head .kicker{font-family:var(--mono);font-size:11.5px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--ink-3);}
.page-head h1{font-family:var(--display);font-weight:400;font-size:clamp(40px,6vw,68px);
  line-height:1;margin:16px 0 0;letter-spacing:-.01em;}
.page-head h1.is-cn{font-family:var(--cn);font-weight:600;}
.page-head p{font-family:var(--serif);font-style:italic;font-size:18px;color:var(--ink-2);
  margin:18px 0 0;max-width:46ch;text-wrap:pretty;}
.page-head p.is-cn{font-family:var(--cn);font-style:normal;}

/* filter bar */
.filter-bar{display:flex;gap:9px;flex-wrap:wrap;margin:46px 0 0;
  padding-bottom:22px;border-bottom:1px solid var(--line);}
.fpill{font-family:var(--mono);font-size:12.5px;letter-spacing:.02em;color:var(--ink-3);
  border:1px solid var(--line);border-radius:999px;padding:8px 16px;cursor:pointer;
  background:transparent;display:inline-flex;align-items:center;gap:8px;transition:all .2s var(--ease);}
.fpill[hidden]{display:none;}
.fpill:hover{color:var(--ink);border-color:var(--line-2);}
.fpill .d{width:7px;height:7px;border-radius:50%;background:var(--dot,var(--ink-3));}
.fpill[data-c="code"]{--dot:var(--c-code);} .fpill[data-c="ctf"]{--dot:var(--c-ctf);}
.fpill[data-c="research"]{--dot:var(--c-research);} .fpill[data-c="life"]{--dot:var(--c-life);}
.fpill.on{color:var(--paper);background:var(--ink);border-color:var(--ink);}
.fpill.on .d{box-shadow:0 0 0 1.5px var(--paper);}
.fpill .ct{opacity:.55;}

.year-group{margin-top:18px;}
.year-label{display:flex;align-items:baseline;gap:14px;padding:36px 0 2px;}
.year-label b{font-family:var(--mono);font-weight:700;font-size:13px;letter-spacing:.18em;color:var(--ink);}
.year-label .ln{flex:1;height:1px;background:var(--line);}
.year-label .ct{font-family:var(--mono);font-size:11.5px;color:var(--ink-3);}
.empty{font-family:var(--mono);font-size:13px;color:var(--ink-3);padding:60px 0;text-align:center;}

/* search */
.search-hero{padding:84px 0 0;}
.search-field{display:flex;align-items:center;gap:16px;border-bottom:2px solid var(--ink);
  padding:0 0 14px;}
.search-field svg{color:var(--ink-3);flex:none;}
.search-input{flex:1;border:none;background:transparent;outline:none;color:var(--ink);
  font-family:var(--display);font-weight:400;font-size:clamp(26px,4vw,42px);letter-spacing:-.01em;}
.search-input::placeholder{color:var(--ink-3);opacity:.5;}
.search-status{font-family:var(--mono);font-size:12.5px;color:var(--ink-3);margin:18px 0 0;letter-spacing:.02em;}
.search-status em{font-style:normal;color:var(--ink);}
.search-hint{font-family:var(--mono);font-size:12.5px;color:var(--ink-3);margin-top:14px;display:flex;gap:8px;flex-wrap:wrap;align-items:center;}
.search-hint kbd{font-family:var(--mono);font-size:11.5px;border:1px solid var(--line-2);border-radius:5px;
  padding:2px 7px;color:var(--ink-2);}
.search-results{margin-top:30px;}
mark{background:color-mix(in srgb,var(--accent) 22%,transparent);color:inherit;border-radius:3px;padding:0 1px;}