:root{
  --ink:#1a1a2e; --ink-soft:#2d2d44;
  --paper:#f5f2ec; --paper-warm:#ede9e0;
  --gold:#c9a84c; --gold-light:#f5edd8;
  --line:rgba(26,26,46,0.10); --line-strong:rgba(26,26,46,0.18);
  --muted:#6b6b80;
  --p-climate:#2d6a4f; --p-climate-l:#e8f4ee;
  --p-nature:#0f766e; --p-nature-l:#e1f2f0;
  --p-tech:#1d4e89; --p-tech-l:#e4eef8;
  --p-economy:#8b4513; --p-economy-l:#f5ede4;
  --p-human:#7b2d8b; --p-human-l:#f4e8f6;
  --t-aplus:#16325c; --t-a:#2a4d80; --t-bplus:#4a72a8; --t-b:#7b9bc4; --t-cplus:#aec3dc; --t-c:#dde6f0;
  --serif:'Noto Serif SC', serif; --disp:'DM Serif Display', serif; --sans:'Noto Sans SC','DM Sans',sans-serif; --mono:'IBM Plex Mono', monospace;
  --max:1180px;
}
*{box-sizing:border-box; margin:0; padding:0;}
html{scroll-behavior:smooth;}
body{font-family:var(--sans); color:var(--ink); background:var(--paper); line-height:1.7; -webkit-font-smoothing:antialiased; overflow-x:hidden;}
a{color:inherit; text-decoration:none;}
img,svg{display:block; max-width:100%;}
::selection{background:var(--gold-light); color:var(--ink);}
@media (prefers-reduced-motion: reduce){*{animation:none !important; transition:none !important;}}
.wrap{max-width:var(--max); margin:0 auto; padding:0 2rem;}

/* NAV */
nav.top{position:sticky; top:0; z-index:200; background:rgba(26,26,46,0.97); backdrop-filter:blur(12px); border-bottom:1px solid rgba(255,255,255,0.07); padding:0 2rem; display:flex; align-items:center; justify-content:space-between; height:56px;}
.nav-brand{font-family:var(--disp); font-size:1rem; color:#fff; letter-spacing:0.01em; display:flex; align-items:center; gap:0.55rem;}
.nav-brand span{color:var(--gold);}
.nav-icon{height:38px; width:auto; display:block;}
.nav-links{display:flex; gap:0.3rem; list-style:none; flex-wrap:wrap;}
.nav-links a{font-size:0.72rem; letter-spacing:0.04em; color:rgba(255,255,255,0.55); padding:0.5rem 0.7rem; font-weight:500; transition:color .2s;}
.nav-links a:hover{color:#fff;}
.nav-links a.active{color:#fff; border-bottom:2px solid var(--gold);}

.nav-burger{display:none; flex-direction:column; justify-content:center; gap:4px; width:20px; height:20px; background:none; border:none; cursor:pointer; padding:0;}
.nav-burger span{display:block; height:1.6px; width:100%; background:#fff; border-radius:1px; transition:transform .25s ease, opacity .2s ease;}
.nav-burger.open span:nth-child(1){transform:translateY(5.6px) rotate(45deg);}
.nav-burger.open span:nth-child(2){opacity:0;}
.nav-burger.open span:nth-child(3){transform:translateY(-5.6px) rotate(-45deg);}

.nav-panel{display:none; flex-direction:column; background:rgba(26,26,46,0.98); backdrop-filter:blur(12px); border-bottom:1px solid rgba(255,255,255,0.08); max-height:0; overflow:hidden; transition:max-height .28s ease; position:fixed; top:56px; left:0; right:0; z-index:199;}
.nav-panel.open{max-height:400px;}
.nav-panel a{font-size:0.85rem; color:rgba(255,255,255,0.65); padding:0.9rem 1.4rem; border-top:1px solid rgba(255,255,255,0.06); font-weight:500;}
.nav-panel a.active{color:var(--gold);}
.nav-panel a:active{background:rgba(255,255,255,0.04);}

/* HERO band (per chapter) */
.hero{background:var(--ink); padding:4.5rem 2rem 3rem; position:relative; overflow:hidden;}
.hero::before{content:''; position:absolute; inset:0; background-image:url("data:image/svg+xml,%3Csvg width='40' height='40' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='20' cy='20' r='0.5' fill='white' opacity='0.04'/%3E%3C/svg%3E"); pointer-events:none;}
.hero-glow{position:absolute; top:-100px; right:-100px; width:480px; height:480px; border-radius:50%; background:radial-gradient(circle, rgba(201,168,76,0.10) 0%, transparent 70%); pointer-events:none;}
.hero-glow2{position:absolute; bottom:-80px; left:-100px; width:420px; height:420px; border-radius:50%; background:radial-gradient(circle, rgba(29,78,137,0.10) 0%, transparent 70%); pointer-events:none;}
.hero-inner{max-width:var(--max); margin:0 auto; position:relative;}
.crumb{display:flex; align-items:center; gap:0.5rem; margin-bottom:1.6rem; font-size:0.66rem; color:rgba(255,255,255,0.32); letter-spacing:0.06em; text-transform:uppercase;}
.crumb span.sep{color:rgba(255,255,255,0.15);}
.crumb span.here{color:rgba(255,255,255,0.65);}
.hero-eyebrow{font-family:var(--mono); font-size:0.68rem; letter-spacing:0.14em; text-transform:uppercase; color:var(--gold); margin-bottom:0.9rem; display:flex; align-items:center; gap:0.6rem;}
.hero-eyebrow::before{content:''; width:20px; height:1px; background:var(--gold);}
h1.hero-title{font-family:var(--serif); font-weight:700; font-size:clamp(1.7rem,3.6vw,2.7rem); line-height:1.28; color:#fff; max-width:780px; letter-spacing:-0.005em;}
.hero-lede{margin-top:1.1rem; font-size:0.92rem; color:rgba(255,255,255,0.55); max-width:660px; line-height:1.85; font-weight:300;}
.hero-stats{display:grid; grid-template-columns:repeat(2,1fr); gap:1px; background:rgba(255,255,255,0.08); max-width:600px; margin-top:2rem; border:1px solid rgba(255,255,255,0.08);}
@media(min-width:640px){.hero-stats{grid-template-columns:repeat(4,1fr);}}
.hero-stat{background:rgba(255,255,255,0.03); padding:0.9rem 1.1rem;}
.hero-stat b{display:block; font-family:var(--disp); font-size:1.5rem; color:#fff; line-height:1;}
.hero-stat span{font-size:0.64rem; color:rgba(255,255,255,0.35); letter-spacing:0.03em;}

/* SECTIONS */
section{padding:3.6rem 0;}
.section-label{font-size:0.66rem; letter-spacing:0.14em; text-transform:uppercase; color:var(--gold-dk,#a3843b); margin-bottom:0.5rem; font-weight:600;}
.section-title{font-family:var(--serif); font-size:clamp(1.25rem,2.2vw,1.6rem); font-weight:700; color:var(--ink);}
.section-title-en{font-family:var(--disp); font-size:0.8rem; font-style:italic; color:var(--muted); margin-top:0.15rem;}
.section-desc{color:var(--muted); margin-top:0.7rem; font-size:0.86rem; line-height:1.8; max-width:720px; font-weight:300;}
.section-head{margin-bottom:1.8rem;}

.band-warm{background:var(--paper-warm); border-top:1px solid var(--line); border-bottom:1px solid var(--line);}
.band-ink{background:var(--ink); color:#fff;}
.band-ink .section-label{color:var(--gold);}
.band-ink .section-title{color:#fff;}
.band-ink .section-title-en{color:rgba(255,255,255,0.35);}
.band-ink .section-desc{color:rgba(255,255,255,0.5);}

p.body-text{font-size:0.88rem; color:var(--ink-soft); line-height:1.9; margin-bottom:0.9rem; font-weight:300; max-width:760px;}
p.body-text b{font-weight:600; color:var(--ink);}

/* CARD GRID */
.grid{display:grid; grid-template-columns:1fr; gap:1.1rem;}
.grid.c2{ }
.grid.c3{ }
.grid.c5{ }
@media(min-width:640px){.grid.c2{grid-template-columns:repeat(2,1fr);}}
@media(min-width:760px){.grid.c3{grid-template-columns:repeat(3,1fr);} .grid.c5{grid-template-columns:repeat(5,1fr);}}
.card{background:#fff; border:1px solid var(--line); border-radius:10px; padding:1.3rem 1.35rem;}
.card .tag{font-family:var(--mono); font-size:0.62rem; letter-spacing:0.06em; color:var(--gold-dk,#a3843b); text-transform:uppercase;}
.card h3{font-family:var(--serif); font-size:0.98rem; font-weight:700; margin:0.5rem 0 0.4rem; color:var(--ink);}
.card p{font-size:0.79rem; color:var(--muted); line-height:1.7; font-weight:300;}

/* STAT CARD (data-forward, replaces long paragraphs) */
.stat-card{background:#fff; border:1px solid var(--line); border-radius:10px; padding:1.1rem 1.2rem; position:relative; overflow:hidden;}
.stat-card .rank-dot{position:absolute; top:0; left:0; bottom:0; width:4px;}
.stat-card .sc-label{font-size:0.62rem; letter-spacing:0.06em; text-transform:uppercase; color:var(--muted); margin-bottom:0.3rem;}
.stat-card .sc-name{font-family:var(--serif); font-size:1.05rem; font-weight:700; color:var(--ink);}
.stat-card .sc-val{font-family:var(--disp); font-size:1.3rem; margin-top:0.2rem;}
.stat-row{display:flex; align-items:baseline; justify-content:space-between; gap:0.6rem;}

/* TIER BADGES */
.tier-badge{display:inline-block; font-family:var(--mono); font-weight:600; font-size:0.74rem; padding:0.22rem 0.6rem; border-radius:3px; color:#fff;}
.t-A_2B{background:var(--t-aplus);} .t-A{background:var(--t-a);}
.t-B_2B{background:var(--t-bplus);} .t-B{background:var(--t-b); color:#1a1a2e !important;}
.t-C_2B{background:var(--t-cplus); color:#1a1a2e !important;} .t-C{background:var(--t-c); color:#1a1a2e !important;}

/* TIER BLOCKS (ratings page) */
.tier-block{background:#fff; border:1px solid var(--line); border-radius:12px; padding:1.5rem 1.6rem; margin-bottom:1rem;}
.tier-block-head{display:flex; align-items:baseline; gap:0.9rem; flex-wrap:wrap; margin-bottom:0.7rem;}
.tier-block-head .tname{font-family:var(--serif); font-size:1.05rem; font-weight:700;}
.tier-block-head .tcount{font-size:0.72rem; color:var(--muted); font-family:var(--mono);}
.tier-desc{font-size:0.82rem; color:var(--muted); line-height:1.8; margin-bottom:0.9rem; font-weight:300; max-width:820px;}
.chips{display:flex; flex-wrap:wrap; gap:0.45rem;}
.chip{border:1px solid var(--line-strong); background:var(--paper-warm); font-size:0.74rem; padding:0.32rem 0.7rem; border-radius:20px; color:var(--ink-soft);}

/* CHART CARD */
.chart-card{background:#fff; border:1px solid var(--line); border-radius:12px; padding:1.4rem 1.5rem;}
.bar-row{display:grid; grid-template-columns:110px 1fr 54px; align-items:center; gap:0.7rem; padding:0.32rem 0;}
.bar-row .lbl{font-size:0.72rem; color:var(--ink-soft); white-space:nowrap; overflow:hidden; text-overflow:ellipsis;}
.bar-row .track{height:9px; background:var(--paper-warm); border-radius:5px; overflow:hidden;}
.bar-row .fill{height:100%; border-radius:5px;}
.bar-row .val{font-family:var(--mono); font-size:0.7rem; text-align:right; color:var(--muted);}

/* FIGURE */
figure.report-figure{border:1px solid var(--line); background:#fff; border-radius:12px; padding:1.2rem; margin:0.5rem 0;}
figure.report-figure figcaption{font-family:var(--mono); font-size:0.68rem; color:var(--muted); margin-top:0.8rem; text-align:center;}

/* SOURCE TABLE */
.src-wrap{border:1px solid var(--line); border-radius:12px; overflow:hidden; max-height:420px; overflow-y:auto; background:#fff;}
table.src{width:100%; border-collapse:collapse; font-size:0.76rem;}
table.src th{text-align:left; font-size:0.62rem; text-transform:uppercase; letter-spacing:0.04em; color:var(--muted); padding:0.6rem 0.8rem; border-bottom:1px solid var(--line-strong); background:var(--paper-warm); position:sticky; top:0;}
table.src td{padding:0.55rem 0.8rem; border-bottom:1px solid var(--line);}
table.src td.n{font-family:var(--mono); font-size:0.66rem; color:var(--muted);}

/* STEP LIST */
.steps{counter-reset:step; margin-top:0.5rem;}
.steps li{list-style:none; position:relative; padding-left:2.1rem; margin-bottom:0.9rem; counter-increment:step; font-size:0.82rem; color:var(--muted); line-height:1.8; font-weight:300;}
.steps li::before{content:counter(step,decimal-leading-zero); position:absolute; left:0; top:0; font-family:var(--mono); font-size:0.68rem; color:var(--gold-dk,#a3843b); font-weight:700;}
.steps li b{color:var(--ink); font-weight:600;}

/* DISCLAIMER */
.callout{border:1px solid var(--line-strong); border-left:3px solid var(--gold); padding:1rem 1.2rem; margin-top:1.3rem; background:#fff; border-radius:0 10px 10px 0; font-size:0.78rem; color:var(--muted); line-height:1.8; font-weight:300;}
.callout b{color:var(--ink); font-weight:600;}

/* DIM SUBNAV */
.dim-nav{display:flex; flex-wrap:wrap; gap:0.4rem; margin-top:1.4rem;}
.dim-nav a{border:1px solid rgba(255,255,255,0.15); font-size:0.72rem; padding:0.42rem 0.85rem; color:rgba(255,255,255,0.6); border-radius:20px;}
.dim-nav a.active{background:var(--gold); border-color:var(--gold); color:#1a1a2e; font-weight:600;}
.dim-nav a:hover{border-color:rgba(255,255,255,0.4); color:#fff;}

/* NEXT CHAPTER */
.next-chapter{display:flex; justify-content:space-between; align-items:center; border-top:1px solid var(--line); margin-top:1rem; padding:1.8rem 0; flex-wrap:wrap; gap:0.9rem;}
.next-chapter a{border:1px solid var(--ink); padding:0.7rem 1.3rem; font-size:0.78rem; font-weight:600; border-radius:24px;}
.next-chapter a:hover{background:var(--ink); color:#fff;}

/* COMPARE PAGE */
.selector-row{display:grid; grid-template-columns:1fr; gap:1rem; margin-bottom:2rem;}
@media(min-width:760px){.selector-row{grid-template-columns:1fr 1fr;}}
.select-card{background:#fff; border:1px solid var(--line); border-radius:12px; padding:1.2rem 1.3rem;}
.select-card label{font-size:0.66rem; text-transform:uppercase; letter-spacing:0.06em; color:var(--muted); display:block; margin-bottom:0.5rem;}
.select-card select{width:100%; padding:0.7rem 0.8rem; border:1px solid var(--line-strong); border-radius:8px; font-family:var(--sans); font-size:0.9rem; background:#fff; color:var(--ink);}
.compare-swatch{display:inline-block; width:10px; height:10px; border-radius:50%; margin-right:0.4rem;}

footer.site{background:var(--ink); color:#fff; padding:2.2rem 2rem; text-align:center; border-top:1px solid rgba(255,255,255,0.06);}
footer.site p{font-size:0.72rem; color:rgba(255,255,255,0.32); line-height:1.8;}

@media(max-width:640px){
  .bar-row{grid-template-columns:80px 1fr 44px;}
  .nav-links{display:none;}
  .nav-burger{display:flex;}
  .nav-panel{display:flex;}
}