/* ══════════════════════════════════════════════════════════════
   TANREN TRAINING SCIENCE 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;
  --success:#2E9E82;
  --warning:#D4A843;
}

[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;
  --success:#1E8E72;
  --warning:#9A7520;
}

/* ── 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;
  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:.03;
  line-height:.85;
  pointer-events:none;
  writing-mode:vertical-rl;
}
.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;
  position:relative;
  z-index:2;
}
.hero h1 em{font-style:italic;color:var(--red)}
#trainingTypeWord{
  display:inline-block;
  position:relative;
}
#trainingTypeWord::after{
  content:'';
  display:inline-block;
  width:3px;
  height:0.85em;
  background:var(--red);
  margin-left:0.08em;
  vertical-align:baseline;
  animation:cursor-blink 1s step-end infinite;
}
@keyframes cursor-blink{
  0%,50%{opacity:1}
  51%,100%{opacity:0}
}
.hero-sub{
  font-size:.8rem;
  color:var(--fg2);
  line-height:1.9;
  max-width:700px;
  position:relative;
  z-index:2;
}

/* ── Main Content ── */
.main-content{
  max-width:1400px;
  margin:0 auto;
  padding:0 2.5rem;
}

/* ── Table of Contents ── */
.toc{
  padding:3rem 0;
  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;
  font-size:.7rem;
  line-height:1.4;
}
.toc-item:hover{background:var(--red-dim)}

/* ── Sections ── */
.section{
  padding:4rem 0;
  border-bottom:1px solid var(--border);
}
.section h2{
  font-family:'Instrument Serif',serif;
  font-size:clamp(1.8rem,4vw,2.8rem);
  font-weight:400;
  line-height:1;
  letter-spacing:-.02em;
  margin-bottom:2rem;
  padding-bottom:1rem;
  border-bottom:2px solid var(--red);
}
.section h3{
  font-family:'Instrument Serif',serif;
  font-size:1.2rem;
  font-weight:400;
  color:var(--red);
  margin:2.5rem 0 1rem;
  text-transform:uppercase;
  letter-spacing:.05em;
}
.section h4{
  font-size:.7rem;
  font-weight:600;
  color:var(--fg);
  margin:1.5rem 0 .75rem;
  text-transform:uppercase;
  letter-spacing:.1em;
}
.section p{
  font-size:.75rem;
  color:var(--fg2);
  line-height:2;
  margin-bottom:1rem;
}

/* ── Research Cards Grid ── */
.cards-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:0;
  margin:2rem 0;
  border:1px solid var(--border);
}
.card{
  padding:1.5rem;
  border-right:1px solid var(--border);
  border-bottom:1px solid var(--border);
  transition:background .3s;
}
.card:nth-child(2n){border-right:none}
.card:nth-last-child(-n+2){border-bottom:none}
.card:hover{background:var(--red-dim)}
.card-title{
  font-size:.5rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--red);
  font-weight:600;
  margin-bottom:.6rem;
}
.card p{
  font-size:.7rem;
  line-height:1.7;
  margin-bottom:.5rem;
}
.card em{color:var(--fg);font-style:italic}

/* ── Info Boxes ── */
.info-box{
  background:var(--red-dim);
  border:1px solid var(--red-line);
  padding:1.5rem 2rem;
  margin:2rem 0;
}
.info-box.science{
  border-left:3px solid var(--success);
  background:rgba(46,158,130,.08);
}
.info-box.warning{
  border-left:3px solid var(--warning);
  background:rgba(212,168,67,.08);
}
.info-box.tip{
  border-left:3px solid var(--red);
}
.info-box-title{
  font-size:.5rem;
  letter-spacing:.15em;
  text-transform:uppercase;
  color:var(--fg);
  font-weight:600;
  margin-bottom:.6rem;
}
.info-box p{
  font-size:.7rem;
  margin:0;
  line-height:1.8;
}

/* ── Tables ── */
.table-wrapper{
  overflow-x:auto;
  margin:2rem 0;
  border:1px solid var(--border);
}
table{
  width:100%;
  border-collapse:collapse;
  font-size:.65rem;
}
thead{
  background:var(--bg3);
}
th{
  font-size:.5rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  font-weight:600;
  color:var(--fg);
  padding:1rem;
  text-align:left;
  border-bottom:2px solid var(--border);
}
td{
  padding:.8rem 1rem;
  border-bottom:1px solid var(--border);
  color:var(--fg2);
  line-height:1.5;
}
tbody tr:hover td{
  background:var(--red-dim);
  color:var(--fg);
}
.highlight-cell{
  background:var(--red-dim);
  color:var(--red);
  font-weight:600;
}

/* ── Stats Grid ── */
.stats-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:0;
  margin:2rem 0;
  border:1px solid var(--border);
}
.stat-card{
  padding:1.5rem;
  text-align:center;
  border-right:1px solid var(--border);
}
.stat-card:last-child{border-right:none}
.stat-value{
  font-family:'Instrument Serif',serif;
  font-size:2rem;
  font-weight:400;
  color:var(--red);
  line-height:1;
  margin-bottom:.3rem;
}
.stat-label{
  font-size:.5rem;
  color:var(--fg3);
  text-transform:uppercase;
  letter-spacing:.1em;
}

/* ── Formula/Code Blocks ── */
.formula{
  background:var(--bg3);
  border:1px solid var(--border);
  padding:1.25rem 1.5rem;
  font-family:'IBM Plex Mono',monospace;
  font-size:.75rem;
  margin:1.5rem 0;
  overflow-x:auto;
  color:var(--fg);
}

/* ── Lists ── */
ul,ol{
  margin:1rem 0 1rem 1.5rem;
  font-size:.7rem;
  color:var(--fg2);
  line-height:2;
}
li{margin-bottom:.3rem}
li::marker{color:var(--red)}

/* ── References ── */
.references{
  background:var(--card-bg);
  border:1px solid var(--border);
  padding:1.5rem;
  margin-top:2rem;
}
.references h4{
  font-size:.5rem;
  letter-spacing:.15em;
  text-transform:uppercase;
  color:var(--fg3);
  margin-bottom:1rem;
}
.references ol{
  margin:0 0 0 1.25rem;
  font-size:.65rem;
}

/* ── Footer ── */
footer{
  border-top:1px solid var(--border);
  padding:3rem 2.5rem;
  max-width:1400px;
  margin:0 auto;
  text-align:center;
}
footer p{
  font-size:.6rem;
  color:var(--fg3);
}

/* ── 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}

/* ── 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){
  .cards-grid{grid-template-columns:1fr}
  .card{border-right:none}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .stat-card:nth-child(2n){border-right:none}
  .stat-card:nth-child(-n+2){border-bottom:1px solid var(--border)}
  .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)}
}

@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}
  .main-content{padding:0 1.2rem}
  .toc{padding:2rem 0}
  .toc-grid{grid-template-columns:1fr}
  .toc-item{border-right:none!important}
  .section{padding:3rem 0}
  .stats-grid{grid-template-columns:1fr}
  .stat-card{border-right:none!important;border-bottom:1px solid var(--border)}
  .stat-card:last-child{border-bottom:none}
  footer{padding:2rem 1.2rem}
  .table-wrapper{margin:1.5rem -1.2rem;width:calc(100% + 2.4rem)}
  .science-promo{padding:3rem 1.2rem}
}