/* ══════════════════════════════════════════════════════════════
   TANREN MENTAL HEALTH PAGE STYLES
   Swiss design system - research/editorial layout
   ══════════════════════════════════════════════════════════════ */

/* ── Reset ── */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

/* ── Theme Variables ── */
[data-theme="dark"]{
  --bg:#0B0B0B;
  --bg2:#111;
  --bg3:#181818;
  --bg4:#1E1E1E;
  --fg:#E8E8E8;
  --fg2:#999;
  --fg3:#555;
  --fg4:#333;
  --red:#FF2D2D;
  --red-dim:rgba(255,255,255,.04);
  --red-line:rgba(255,255,255,.07);
  --border:#222;
  --border2:#282828;
  --nav-bg:rgba(11,11,11,.92);
  --card-bg:#111;
  --card-hover:#161616;
  --code-bg:#151515;
  --kanji-opacity:.03;
}

[data-theme="light"]{
  --bg:#F0F0F0;
  --bg2:#E6E6E6;
  --bg3:#DADADA;
  --bg4:#D6D5D1;
  --fg:#111;
  --fg2:#555;
  --fg3:#999;
  --fg4:#BBB;
  --red:#D41D1D;
  --red-dim:rgba(0,0,0,.04);
  --red-line:rgba(0,0,0,.07);
  --border:#CCC;
  --border2:#C4C3BF;
  --nav-bg:rgba(240,240,240,.94);
  --card-bg:#E6E6E6;
  --card-hover:#DADADA;
  --code-bg:#E6E5E1;
  --kanji-opacity:.03;
}

/* ── Base ── */
html{scroll-behavior:smooth;scroll-padding-top:5rem}
body{
  font-family:'IBM Plex Mono',monospace;
  background:var(--bg);
  color:var(--fg);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  font-size:13px;
  line-height:1.7;
  transition:background .4s,color .4s;
}

/* ── Selection ── */
::selection{background:var(--red);color:#fff}

/* ── Scrollbar ── */
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--border2);border-radius:0}
::-webkit-scrollbar-thumb:hover{background:var(--fg3)}

/* ── Nav ── */
nav{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:100;
  padding:.8rem 2.5rem;
  display:flex;
  justify-content:space-between;
  align-items:center;
  background:var(--nav-bg);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
  transition:all .4s;
}
.nav-l{
  font-family:'Instrument Serif',serif;
  font-size:1.3rem;
  font-weight:400;
  color:var(--fg);
  display:flex;
  align-items:baseline;
  gap:.6rem;
  text-decoration:none;
}
.nav-l span{
  font-family:'IBM Plex Mono',monospace;
  font-size:.5rem;
  color:var(--fg3);
  letter-spacing:.1em;
}
.nav-r{display:flex;align-items:center;gap:1.2rem}
.nav-r a{
  color:var(--fg3);
  text-decoration:none;
  font-size:.6rem;
  letter-spacing:.1em;
  text-transform:uppercase;
  font-weight:600;
  transition:color .3s;
}
.nav-r a:hover{color:var(--fg)}
.nav-r a.active{color:var(--red)}

/* ── Theme Toggle ── */
.tt{
  width:28px;
  height:28px;
  border:1px solid var(--border);
  background:transparent;
  cursor:pointer;
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--fg3);
  font-size:.7rem;
  transition:all .3s;
}
.tt:hover{border-color:var(--red);color:var(--red)}
[data-theme="dark"] .ts{display:inline}
[data-theme="dark"] .tm{display:none}
[data-theme="light"] .ts{display:none}
[data-theme="light"] .tm{display:inline}

/* ── Language Selector ── */
.lang-sel{position:relative}
.lang-btn{
  background:0;
  border:1px solid var(--border);
  color:var(--fg3);
  padding:.35rem .55rem;
  font-family:'IBM Plex Mono',monospace;
  font-size:.5rem;
  font-weight:600;
  letter-spacing:.1em;
  cursor:pointer;
  display:flex;
  align-items:center;
  gap:.3rem;
  transition:.3s;
}
.lang-btn:hover{border-color:var(--red);color:var(--fg)}
.lang-btn::after{content:'▾';font-size:.5rem;color:var(--fg3)}
.lang-menu{
  position:absolute;
  top:calc(100% + 4px);
  right:0;
  background:var(--bg);
  border:1px solid var(--border);
  min-width:140px;
  display:none;
  flex-direction:column;
  z-index:200;
  transition:all .4s;
}
.lang-menu.open{display:flex}
.lang-opt{
  padding:.5rem .8rem;
  font-family:'IBM Plex Mono',monospace;
  font-size:.55rem;
  color:var(--fg3);
  background:0;
  border:0;
  cursor:pointer;
  text-align:left;
  display:flex;
  align-items:center;
  gap:.5rem;
  transition:all .2s;
  border-bottom:1px solid var(--border);
}
.lang-opt:last-child{border-bottom:none}
.lang-opt:hover{background:rgba(128,128,128,.08);color:var(--fg)}
.lang-opt.active{color:var(--red);font-weight:700}
.lang-native{color:var(--fg3);margin-left:auto;font-size:.5rem}

/* ── Hero ── */
.hero{
  padding:8rem 2.5rem 4rem;
  max-width:1400px;
  margin:0 auto;
  display:grid;
  grid-template-columns:1fr 380px;
  gap:4rem;
  align-items:end;
  border-bottom:1px solid var(--border);
  position:relative;
}
.hero::after{
  content:'鍛錬';
  position:absolute;
  right:2.5rem;
  top:5rem;
  font-family:'Instrument Serif',serif;
  font-size:18rem;
  color:var(--fg);
  opacity:var(--kanji-opacity);
  line-height:.85;
  pointer-events:none;
  writing-mode:vertical-rl;
}
.hero-main{position:relative;z-index:2}
.hero-tag{
  font-size:.55rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--red);
  font-weight:600;
  margin-bottom:1.5rem;
  display:flex;
  align-items:center;
  gap:.8rem;
}
.hero-tag::before{content:'';width:24px;height:1px;background:var(--red)}
.hero h1{
  font-family:'Instrument Serif',serif;
  font-size:clamp(3rem,7vw,5.5rem);
  font-weight:400;
  line-height:.88;
  letter-spacing:-.03em;
  margin-bottom:1.5rem;
}
.hero h1 em{font-style:italic;color:var(--red)}
.hero-sub{
  font-size:.8rem;
  color:var(--fg2);
  line-height:1.9;
  max-width:520px;
}
.hero-meta{
  position:relative;
  z-index:2;
  border-left:1px solid var(--border);
  padding-left:2rem;
}
.hm-item{
  padding:1.2rem 0;
  border-bottom:1px solid var(--border);
}
.hm-item:last-child{border:none}
.hm-num{
  font-size:2rem;
  font-weight:700;
  color:var(--fg);
  letter-spacing:-.02em;
  line-height:1;
  margin-bottom:.3rem;
}
.hm-num .unit{font-size:.7rem;color:var(--fg3);font-weight:400;margin-left:.2rem}
.hm-label{font-size:.55rem;color:var(--fg3);letter-spacing:.12em;text-transform:uppercase}

/* ── Table of Contents ── */
.toc{
  padding:3rem 2.5rem;
  max-width:1400px;
  margin:0 auto;
  border-bottom:1px solid var(--border);
}
.toc-header{
  font-size:.55rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--fg3);
  margin-bottom:1.5rem;
  font-weight:600;
}
.toc-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:0;
}
.toc-item{
  padding:1rem 1.5rem 1rem 0;
  border-right:1px solid var(--border);
  transition:all .3s;
}
.toc-item:nth-child(4n){border-right:none}
.toc-item:nth-child(n+5){border-top:1px solid var(--border)}
.toc-item a{
  text-decoration:none;
  color:var(--fg);
  display:block;
}
.toc-item:hover{background:var(--red-dim)}
.toc-num{
  font-size:.5rem;
  color:var(--red);
  letter-spacing:.15em;
  font-weight:600;
  margin-bottom:.4rem;
}
.toc-title{
  font-family:'Instrument Serif',serif;
  font-size:1rem;
  font-weight:400;
  line-height:1.2;
  margin-bottom:.3rem;
}
.toc-desc{font-size:.6rem;color:var(--fg3);line-height:1.5}

/* ── Philosophy Banner ── */
.phil{
  padding:5rem 2.5rem;
  max-width:1400px;
  margin:0 auto;
  display:grid;
  grid-template-columns:280px 1fr;
  gap:4rem;
  border-bottom:1px solid var(--border);
}
.phil-left{
  border-right:1px solid var(--border);
  padding-right:2rem;
}
.phil-kanji{
  font-family:'Instrument Serif',serif;
  font-size:5rem;
  line-height:.9;
  color:var(--fg);
  margin-bottom:1rem;
}
.phil-rom{
  font-size:.55rem;
  letter-spacing:.15em;
  text-transform:uppercase;
  color:var(--fg3);
  margin-bottom:1.5rem;
  font-weight:600;
}
.phil-def{
  font-size:.7rem;
  color:var(--fg2);
  line-height:1.8;
}
.phil-def strong{color:var(--fg);font-weight:600}
.phil-right h2{
  font-family:'Instrument Serif',serif;
  font-size:clamp(1.6rem,3vw,2.2rem);
  font-weight:400;
  line-height:1.15;
  margin-bottom:1.5rem;
  letter-spacing:-.02em;
}
.phil-right h2 em{font-style:italic;color:var(--red)}
.phil-body{
  font-size:.75rem;
  color:var(--fg2);
  line-height:2;
  max-width:700px;
  margin-bottom:2rem;
}
.phil-principles{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:0;
  border:1px solid var(--border);
}
.pp{
  padding:1.2rem 1.5rem;
  border-right:1px solid var(--border);
  border-bottom:1px solid var(--border);
  transition:background .3s;
}
.pp:nth-child(2n){border-right:none}
.pp:nth-child(n+3){border-bottom:none}
.pp:hover{background:var(--red-dim)}
.pp-head{
  font-size:.5rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--red);
  font-weight:600;
  margin-bottom:.5rem;
}
.pp-text{font-size:.7rem;color:var(--fg2);line-height:1.7}

/* ── Research Section ── */
.section{
  padding:5rem 2.5rem;
  max-width:1400px;
  margin:0 auto;
  border-bottom:1px solid var(--border);
}
.section-header{
  display:grid;
  grid-template-columns:80px 1fr;
  gap:2rem;
  align-items:start;
  margin-bottom:3rem;
  padding-bottom:2rem;
  border-bottom:1px solid var(--border);
}
.s-num{
  font-family:'Instrument Serif',serif;
  font-size:3.5rem;
  font-weight:400;
  color:var(--red);
  line-height:.85;
  letter-spacing:-.03em;
}
.s-meta{}
.s-tag{
  font-size:.5rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--fg3);
  font-weight:600;
  margin-bottom:.5rem;
}
.s-title{
  font-family:'Instrument Serif',serif;
  font-size:clamp(1.8rem,4vw,2.8rem);
  font-weight:400;
  line-height:1;
  letter-spacing:-.02em;
  margin-bottom:.8rem;
}
.s-finding{
  font-size:.78rem;
  color:var(--fg2);
  line-height:1.9;
  max-width:700px;
  padding-left:1.5rem;
  border-left:2px solid var(--red);
}

/* ── Research Grid ── */
.research-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:0;
  margin-bottom:3rem;
}
.r-card{
  padding:1.5rem;
  border-right:1px solid var(--border);
  border-bottom:1px solid var(--border);
  transition:background .3s;
}
.r-card:nth-child(2n){border-right:none}
.r-card:hover{background:var(--red-dim)}
.r-source{
  font-size:.5rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--red);
  font-weight:600;
  margin-bottom:.6rem;
  display:flex;
  justify-content:space-between;
  align-items:center;
}
.r-year{color:var(--fg3);letter-spacing:.08em}
.r-title{
  font-family:'Instrument Serif',serif;
  font-size:.9rem;
  font-weight:400;
  line-height:1.3;
  margin-bottom:.6rem;
}
.r-title a{
  color:var(--fg);
  text-decoration:none;
  transition:color .3s;
}
.r-title a:hover{color:var(--red)}
.r-desc{font-size:.65rem;color:var(--fg3);line-height:1.7}
.r-desc li{margin-bottom:.2rem;list-style:none;padding-left:1em;position:relative}
.r-desc li::before{
  content:'—';
  position:absolute;
  left:0;
  color:var(--fg4);
}

/* ── Day Card Snippets ── */
.snippets{margin-bottom:2rem}
.snippets-header{
  font-size:.5rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--fg3);
  font-weight:600;
  margin-bottom:1rem;
  display:flex;
  align-items:center;
  gap:.8rem;
}
.snippets-header::after{content:'';flex:1;height:1px;background:var(--border)}
.snippet-group{margin-bottom:1.5rem}
.sg-label{
  font-size:.55rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--fg2);
  font-weight:600;
  margin-bottom:.6rem;
  display:flex;
  align-items:center;
  gap:.6rem;
}
.sg-dot{width:6px;height:6px;border-radius:50%}
.sg-dot.easy{background:#3B82F6}
.sg-dot.long{background:#8B5CF6}
.sg-dot.hard{background:var(--red)}
.sg-dot.tanren{background:#F59E0B}
.sg-dot.any{background:var(--fg3)}
.sg-dot.morning{background:#F97316}
.sg-dot.rest{background:#10B981}
.sg-dot.interval{background:#EF4444}

.snippet-cards{display:flex;flex-direction:column;gap:.4rem}
.snippet{
  padding:.6rem 1rem;
  background:var(--card-bg);
  border-left:2px solid var(--border);
  font-size:.7rem;
  color:var(--fg2);
  line-height:1.6;
  font-style:italic;
  transition:all .3s;
}
.snippet:hover{
  border-left-color:var(--red);
  background:var(--card-hover);
  color:var(--fg);
}

/* ── Tanren Connection Block ── */
.tanren-block{
  background:var(--red-dim);
  border:1px solid var(--red-line);
  padding:1.5rem 2rem;
  margin-top:1rem;
}
.tb-header{
  font-size:.5rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--red);
  font-weight:600;
  margin-bottom:.8rem;
}
.tb-items{display:flex;flex-direction:column;gap:.3rem}
.tb-item{
  font-family:'Instrument Serif',serif;
  font-size:.85rem;
  font-style:italic;
  color:var(--fg);
  line-height:1.5;
  padding-left:1rem;
  border-left:1px solid var(--red-line);
}

/* ── Implementation Section ── */
.impl{
  padding:5rem 2.5rem;
  max-width:1400px;
  margin:0 auto;
  border-bottom:1px solid var(--border);
}
.impl h2{
  font-family:'Instrument Serif',serif;
  font-size:clamp(1.6rem,3vw,2.2rem);
  font-weight:400;
  line-height:1.1;
  letter-spacing:-.02em;
  margin-bottom:2rem;
}
.impl-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:0;
  border:1px solid var(--border);
  margin-bottom:3rem;
}
.impl-cell{
  padding:1.2rem 1.5rem;
  border-right:1px solid var(--border);
}
.impl-cell:nth-child(4n){border-right:none}
.impl-cell:nth-child(n+5){border-top:1px solid var(--border)}
.ic-type{
  font-size:.5rem;
  letter-spacing:.15em;
  text-transform:uppercase;
  font-weight:700;
  margin-bottom:.5rem;
}
.ic-type.easy{color:#3B82F6}
.ic-type.long{color:#8B5CF6}
.ic-type.tempo{color:#F59E0B}
.ic-type.rest{color:#10B981}
.ic-focus{
  font-family:'Instrument Serif',serif;
  font-size:.85rem;
  font-weight:400;
  line-height:1.3;
  margin-bottom:.4rem;
}
.ic-tone{font-size:.6rem;color:var(--fg3);font-style:italic}

/* ── References Table ── */
.ref-table{
  width:100%;
  border-collapse:collapse;
  margin-bottom:2rem;
}
.ref-table th{
  font-size:.5rem;
  letter-spacing:.15em;
  text-transform:uppercase;
  color:var(--fg3);
  font-weight:600;
  text-align:left;
  padding:.8rem 1rem;
  border-bottom:2px solid var(--border);
}
.ref-table td{
  font-size:.65rem;
  color:var(--fg2);
  padding:.7rem 1rem;
  border-bottom:1px solid var(--border);
  line-height:1.5;
  vertical-align:top;
}
.ref-table tr:hover td{color:var(--fg);background:var(--red-dim)}
.ref-table td:first-child{font-weight:600;color:var(--fg)}
.ref-table td:nth-child(3){color:var(--fg3)}

/* ── Summary Section ── */
.summary{
  padding:6rem 2.5rem;
  max-width:1400px;
  margin:0 auto;
  text-align:center;
}
.summary-tag{
  font-size:.55rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--red);
  font-weight:600;
  margin-bottom:1.5rem;
}
.summary h2{
  font-family:'Instrument Serif',serif;
  font-size:clamp(2rem,5vw,3.5rem);
  font-weight:400;
  line-height:.95;
  letter-spacing:-.03em;
  margin-bottom:2rem;
}
.summary h2 em{font-style:italic;color:var(--red)}
.summary-body{
  font-size:.78rem;
  color:var(--fg2);
  line-height:2;
  max-width:600px;
  margin:0 auto 3rem;
}
.summary-pillars{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:0;
  max-width:900px;
  margin:0 auto 3rem;
  border:1px solid var(--border);
}
.sp{
  padding:2rem 1.5rem;
  border-right:1px solid var(--border);
  text-align:center;
  transition:background .3s;
}
.sp:last-child{border-right:none}
.sp:hover{background:var(--red-dim)}
.sp-icon{
  font-size:1.5rem;
  margin-bottom:.8rem;
  opacity:.6;
}
.sp-label{
  font-size:.5rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--red);
  font-weight:600;
  margin-bottom:.5rem;
}
.sp-text{font-size:.68rem;color:var(--fg2);line-height:1.7}
.summary-kanji{
  font-family:'Instrument Serif',serif;
  font-size:3.5rem;
  color:var(--fg);
  opacity:.15;
  letter-spacing:.2em;
}

/* ── Footer ── */
footer{
  border-top:1px solid var(--border);
  padding:2rem 2.5rem;
  display:flex;
  justify-content:space-between;
  align-items:center;
  max-width:1400px;
  margin:0 auto;
}
.ft-brand{
  font-family:'Instrument Serif',serif;
  font-size:.85rem;
  color:var(--fg3);
}
.ft-links{display:flex;gap:1.5rem}
.ft-links a{
  font-size:.55rem;
  color:var(--fg3);
  text-decoration:none;
  letter-spacing:.1em;
  text-transform:uppercase;
  font-weight:600;
  transition:color .3s;
}
.ft-links a:hover{color:var(--fg)}

/* ── History Section ── */
.history-content{margin-bottom:2rem}
.hist-grid{display:flex;flex-direction:column;gap:0}
.hist-era{
  padding:2rem 0;
  border-bottom:1px solid var(--border);
  display:grid;
  grid-template-columns:200px 1fr;
  gap:2rem;
  align-items:start;
  position:relative;
  overflow:hidden;
}
.hist-era:last-child{border-bottom:none}
.hist-period{
  font-family:'Instrument Serif',serif;
  font-size:1rem;
  font-weight:400;
  line-height:1.2;
  position:sticky;
  top:5rem;
  grid-column:1;
  grid-row:1;
}
.hist-date{
  font-size:.5rem;
  letter-spacing:.15em;
  text-transform:uppercase;
  color:var(--fg3);
  font-weight:600;
  margin-top:.3rem;
  position:sticky;
  top:6.5rem;
  grid-column:1;
  grid-row:2;
}
.hist-body{
  font-size:.72rem;
  color:var(--fg2);
  line-height:2;
  grid-column:2;
  grid-row:1 / span 2;
}
.hist-body strong{color:var(--fg);font-weight:600}

/* ── History Era Backgrounds ── */
.hist-era::before{
  content:'';
  position:absolute;
  right:0;
  top:0;
  width:50%;
  height:100%;
  background-size:cover;
  background-position:center;
  opacity:0.08;
  pointer-events:none;
  filter:grayscale(100%);
  mask-image:linear-gradient(to right, transparent, black 30%);
  -webkit-mask-image:linear-gradient(to right, transparent, black 30%);
  z-index:0;
}
.hist-period,.hist-date{
  z-index:1;
}
.hist-body{
  position:relative;
  z-index:1;
}
.hist-era--heian::before{
  background-image:url('assets/img/histroy-background/Heian%20Period.jpg');
}
.hist-era--muromachi::before{
  background-image:url('assets/img/histroy-background/Muromachi%20Period.jpg');
}
.hist-era--edo::before{
  background-image:url('assets/img/histroy-background/Edo%20Period.jpg');
}
.hist-era--meiji::before{
  background-image:url('assets/img/histroy-background/Meiji–Shōwa%20Period.jpg');
}
.hist-era--modern::before{
  background-image:url('assets/img/histroy-background/Modern.jpg');
}

/* ── Animations ── */
.anim{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .7s cubic-bezier(.25,.46,.45,.94),transform .7s cubic-bezier(.25,.46,.45,.94);
}
.anim.v{opacity:1;transform:none}
.anim-d1{transition-delay:.1s}
.anim-d2{transition-delay:.2s}
.anim-d3{transition-delay:.3s}
.anim-d4{transition-delay:.4s}

/* ── Cross-links ── */
.science-promo{
  padding:5rem 2.5rem;
  border-top:1px solid var(--border);
  background:var(--bg);
}
.science-promo.alt{
  background:var(--bg2);
}
.sp-inner{
  max-width:800px;
  margin:0 auto;
}
.sp-tag{
  font-size:.55rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--red);
  font-weight:600;
  display:flex;
  align-items:center;
  gap:.75rem;
  margin-bottom:1rem;
}
.sp-tag::before{
  content:'';
  width:24px;
  height:1px;
  background:var(--red);
}
.science-promo h2{
  font-family:'Instrument Serif',serif;
  font-size:clamp(2rem,5vw,3.5rem);
  font-weight:400;
  line-height:.95;
  letter-spacing:-.02em;
  margin-bottom:1rem;
}
.science-promo h2 .it{
  font-style:italic;
  color:var(--red);
}
.science-promo p{
  font-size:.8rem;
  color:var(--fg2);
  line-height:1.8;
  margin-bottom:1.5rem;
  max-width:600px;
}
.sp-link{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  font-size:.7rem;
  font-weight:600;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--fg);
  text-decoration:none;
  transition:color .3s;
}
.sp-link:hover{color:var(--red)}
.sp-link span{
  transition:transform .3s;
}
.sp-link:hover span{
  transform:translateX(4px);
}

/* ── Responsive ── */
@media(max-width:1000px){
  .hero{grid-template-columns:1fr;gap:2rem}
  .hero-meta{border-left:none;padding-left:0;border-top:1px solid var(--border);padding-top:2rem;display:grid;grid-template-columns:repeat(3,1fr);gap:0}
  .hm-item{border-bottom:none;border-right:1px solid var(--border);padding:0 1rem}
  .hm-item:last-child{border:none}
  .hero::after{font-size:10rem;top:4rem}
  .toc-grid{grid-template-columns:1fr 1fr}
  .toc-item:nth-child(2n){border-right:none}
  .toc-item:nth-child(n+3){border-top:1px solid var(--border)}
  .phil{grid-template-columns:1fr;gap:2rem}
  .phil-left{border-right:none;border-bottom:1px solid var(--border);padding-right:0;padding-bottom:2rem}
  .research-grid{grid-template-columns:1fr}
  .r-card{border-right:none}
  .impl-grid{grid-template-columns:1fr 1fr}
  .impl-cell:nth-child(2n){border-right:none}
  .impl-cell:nth-child(n+3){border-top:1px solid var(--border)}
  .summary-pillars{grid-template-columns:1fr}
  .sp{border-right:none;border-bottom:1px solid var(--border)}
  .sp:last-child{border-bottom:none}
}

@media(max-width:600px){
  nav{padding:.8rem 1.2rem}
  .nav-r a:not(.active){display:none}
  .hero{padding:7rem 1.2rem 3rem}
  .hero h1{font-size:clamp(2.5rem,10vw,3.5rem)}
  .hero::after{display:none}
  .hero-meta{grid-template-columns:1fr;gap:0}
  .hm-item{border-right:none;border-bottom:1px solid var(--border);padding:.8rem 0}
  .toc{padding:2rem 1.2rem}
  .toc-grid{grid-template-columns:1fr}
  .toc-item{border-right:none!important}
  .toc-item:nth-child(n+2){border-top:1px solid var(--border)}
  .phil{padding:3rem 1.2rem}
  .phil-principles{grid-template-columns:1fr}
  .pp{border-right:none!important;border-bottom:1px solid var(--border)}
  .pp:last-child{border-bottom:none}
  .section{padding:3rem 1.2rem}
  .section-header{grid-template-columns:50px 1fr;gap:1rem}
  .s-num{font-size:2.5rem}
  .impl{padding:3rem 1.2rem}
  .impl-grid{grid-template-columns:1fr}
  .impl-cell{border-right:none!important}
  .summary{padding:4rem 1.2rem}
  footer{flex-direction:column;gap:1rem;text-align:center;padding:1.5rem 1.2rem}
  .ref-table{display:block;overflow-x:auto}
  .hist-era{grid-template-columns:1fr;gap:.5rem}
  .hist-period,.hist-date{position:static}
  .science-promo{padding:3rem 1.2rem}
}