/* style.css – modern responsive theme (light + dark) */
:root{--bg:#f6f9fb;--surface:#fff;--ink:#0f1b2d;--muted:#566178;--line:#dde4ec;--beam:#0a7f8f;--beam-soft:#e0f2f4;--amber:#d98a1f;--soft:#b9ccd2;--shadow:0 10px 30px rgba(15,27,45,.08);--r:16px;--gut:clamp(18px,4vw,32px)}
@media(prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#0b1220;--surface:#121c2e;--ink:#e8eef7;--muted:#9aa7bd;--line:#223049;--beam:#43c3d2;--beam-soft:#12303a;--amber:#f2b457;--soft:#2c3d57;--shadow:0 10px 30px rgba(0,0,0,.35)}}
:root[data-theme="dark"]{--bg:#0b1220;--surface:#121c2e;--ink:#e8eef7;--muted:#9aa7bd;--line:#223049;--beam:#43c3d2;--beam-soft:#12303a;--amber:#f2b457;--soft:#2c3d57;--shadow:0 10px 30px rgba(0,0,0,.35)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;background:var(--bg);color:var(--ink);font:clamp(16px,.35vw + 15px,18px)/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;-webkit-text-size-adjust:100%}
a{color:var(--beam);text-underline-offset:3px}img{max-width:100%;height:auto;display:block}
:focus-visible{outline:3px solid var(--beam);outline-offset:3px;border-radius:6px}
.wrap{width:min(1080px,100% - 2*var(--gut));margin-inline:auto}
.skip{position:absolute;left:-999px;top:8px;background:var(--beam);color:#fff;padding:8px 14px;border-radius:8px;z-index:100}.skip:focus{left:8px}

/* header */
header.site{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;gap:12px;min-height:64px}
.brand{font-weight:700;font-size:1.1rem;letter-spacing:-.01em;color:var(--ink);text-decoration:none;margin-right:auto}
nav ul{list-style:none;margin:0;padding:0}
nav>ul{display:flex;gap:4px;font-size:.95rem}
nav a{display:block;padding:10px 14px;border-radius:10px;color:var(--ink);text-decoration:none;transition:background .2s,color .2s}
nav a:hover{background:var(--beam-soft);color:var(--beam)}
nav a[aria-current]{color:var(--beam);font-weight:600;background:var(--beam-soft)}
.has-sub{position:relative;display:flex;flex-wrap:wrap;align-items:center}
.sub-toggle{display:none}
.sub{display:none;position:absolute;top:100%;left:0;min-width:220px;padding:8px;background:var(--surface);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow)}
.has-sub:hover .sub,.has-sub:focus-within .sub{display:block}.has-sub.closed .sub{display:none!important}
.theme-btn,.menu-btn{width:42px;height:42px;border-radius:12px;border:1px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer;display:grid;place-items:center}
.theme-btn::before{content:"";width:16px;height:16px;border-radius:50%;background:linear-gradient(90deg,currentColor 50%,transparent 50%);border:2px solid currentColor}
.menu-btn{display:none}.menu-btn span,.menu-btn span::before,.menu-btn span::after{display:block;width:18px;height:2px;background:currentColor;border-radius:2px;transition:transform .25s,opacity .25s}
.menu-btn span{position:relative}.menu-btn span::before,.menu-btn span::after{content:"";position:absolute;left:0}.menu-btn span::before{top:-6px}.menu-btn span::after{top:6px}
.menu-btn[aria-expanded="true"] span{background:transparent}.menu-btn[aria-expanded="true"] span::before{transform:translateY(6px) rotate(45deg)}.menu-btn[aria-expanded="true"] span::after{transform:translateY(-6px) rotate(-45deg)}
@media(max-width:860px){
 .menu-btn{display:grid}
 nav{position:absolute;left:0;right:0;top:100%;background:var(--bg);border-bottom:1px solid var(--line);padding:8px var(--gut) 16px;display:none;max-height:calc(100vh - 64px);overflow:auto}
 nav.open{display:block}nav>ul{flex-direction:column;gap:2px}nav a{padding:12px 14px}
 .has-sub>a{flex:1}.sub-toggle{display:block;width:44px;height:44px;border:0;background:none;color:var(--ink);cursor:pointer}
 .sub-toggle::before{content:"";display:block;width:8px;height:8px;margin:auto;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg);transition:transform .25s}
 .sub-toggle[aria-expanded="true"]::before{transform:rotate(225deg)}
 .sub,.has-sub:hover .sub,.has-sub:focus-within .sub{position:static;display:none;width:100%;border:0;box-shadow:none;background:none;padding:0 0 6px 14px}
 .has-sub.expanded .sub{display:block}
}

/* hero */
.hero{display:grid;grid-template-columns:1.5fr 1fr;gap:clamp(24px,6vw,72px);align-items:center;padding:clamp(36px,8vw,96px) 0 clamp(24px,5vw,56px)}
.eyebrow{margin:0 0 12px;font-size:.85rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--beam)}
h1{font-size:clamp(2.2rem,6vw,3.9rem);line-height:1.05;margin:0 0 14px;letter-spacing:-.03em}
.tagline{font-size:clamp(1.05rem,1.5vw + .6rem,1.3rem);color:var(--muted);margin:0 0 24px;max-width:36em}
.portrait{width:100%;max-width:340px;aspect-ratio:4/5;object-fit:cover;object-position:top;border-radius:28px;justify-self:center;box-shadow:var(--shadow);border:1px solid var(--line)}
@media(max-width:760px){.hero{grid-template-columns:1fr}.portrait{order:-1;max-width:200px;justify-self:start}}
.actions{display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;min-height:44px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font-weight:600;text-decoration:none;transition:transform .2s,box-shadow .2s}
.btn:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.btn.primary{background:var(--beam);border-color:var(--beam);color:#fff}
[data-theme="dark"] .btn.primary{color:#07202a}

/* sections */
section{padding:clamp(28px,5vw,52px) 0;border-top:1px solid var(--line)}
header.page{padding:clamp(32px,6vw,64px) 0 clamp(16px,3vw,28px)}
h2{font-size:.85rem;margin:0 0 20px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--beam)}
h3{margin:0 0 6px;font-size:1.2rem;line-height:1.3}p{margin:0 0 16px}
.prose{max-width:68ch}.prose strong,.entry strong{font-weight:650}
.philosophy{margin:24px 0 0;padding:18px 22px;border-left:4px solid var(--beam);background:var(--beam-soft);border-radius:0 var(--r) var(--r) 0}
.meta{font-size:.9rem;color:var(--muted)}
.cards,.tool-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,250px),1fr));gap:16px;list-style:none;margin:0;padding:0}
.card,.tool-link{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:22px;transition:transform .25s,box-shadow .25s,border-color .25s}
.card:hover,.tool-link:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--beam)}
.tag{display:inline-block;margin-bottom:10px;padding:2px 12px;border-radius:999px;background:var(--beam-soft);color:var(--beam);font-size:.8rem;font-weight:600}
.tool-link{display:flex;align-items:center;gap:18px;height:100%;color:inherit;text-decoration:none}
.tool-text strong{display:block;color:var(--ink);font-size:1.05rem}.tool-text span{display:block;color:var(--muted);font-size:.92rem;line-height:1.45}
.icon{width:48px;height:48px}.icon-large{width:84px;height:84px}
.pills{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:10px}
.pills li{background:var(--surface);border:1px solid var(--line);padding:6px 16px;border-radius:999px;font-size:.92rem;transition:transform .2s,border-color .2s}.pills li:hover{transform:translateY(-3px);border-color:var(--beam)}
ul.plain{padding-left:20px;margin:0 0 16px}ul.plain li{margin-bottom:8px}
.row{display:grid;grid-template-columns:minmax(0,280px) 1fr;gap:clamp(16px,4vw,32px);align-items:center;margin-bottom:28px}
.row img{border-radius:12px;border:1px solid var(--line);width:100%}
@media(max-width:640px){.row{grid-template-columns:1fr}}
.entry{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px 22px;margin-bottom:16px}.entry h3{margin-bottom:10px}
.poster img{border-radius:12px;border:1px solid var(--line);width:100%;max-width:700px;margin-top:12px;transition:transform .3s,box-shadow .3s}.poster:hover img{transform:translateY(-3px);box-shadow:var(--shadow)}
.publication{display:block}.publication img{border-radius:12px;border:1px solid var(--line);width:100%;max-width:600px;margin:12px auto 0;transition:transform .3s,box-shadow .3s}.publication:hover img{transform:translateY(-3px);box-shadow:var(--shadow)}
.page-education section .entry{position:relative;margin-left:22px;border-radius:0 var(--r) var(--r) 0;border-left:3px solid var(--beam)}
.page-education section .entry::before{content:"";position:absolute;left:-31px;top:24px;width:15px;height:15px;border-radius:50%;background:var(--bg);border:3px solid var(--beam)}
footer{padding:28px 0 56px;border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}.foot{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}