/* ==========================================================================
   Juha (Hazel) Choi — portfolio styles
   Concept: "process flow". Petrol teal (solvent) + amber (reaction heat) on
   warm paper; a quiet hexagonal lattice in the hero; the career timeline is
   drawn like a process flow diagram; skills are laid out as a periodic table.
   ========================================================================== */
:root{
  --paper:#FBF8F2; --paper-2:#F3EEE4; --ink:#15202B; --ink-2:#3C4852; --muted:#6B7680;
  --teal:#0F6E6E; --teal-2:#0B5757; --teal-soft:#DCEBEA; --amber:#C8781A; --amber-soft:#F7E6CF;
  --line:#E2DCD0; --card:#FFFFFF; --shadow:0 10px 30px rgba(21,32,43,.08);
  --serif:"Newsreader",Georgia,"Times New Roman",serif;
  --sans:"Inter",-apple-system,"Segoe UI",Roboto,"Noto Sans KR",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --max:1080px; --gutter:clamp(16px,4vw,40px);
  color-scheme:light;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:#0E1419; --paper-2:#141C23; --ink:#ECEFF1; --ink-2:#C5CDD3; --muted:#8B98A3;
    --teal:#5BBDBD; --teal-2:#8ED6D6; --teal-soft:#122A2B; --amber:#E6A04A; --amber-soft:#3A2A14;
    --line:#243039; --card:#141C23; --shadow:0 10px 30px rgba(0,0,0,.35); color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --paper:#0E1419; --paper-2:#141C23; --ink:#ECEFF1; --ink-2:#C5CDD3; --muted:#8B98A3;
  --teal:#5BBDBD; --teal-2:#8ED6D6; --teal-soft:#122A2B; --amber:#E6A04A; --amber-soft:#3A2A14;
  --line:#243039; --card:#141C23; --shadow:0 10px 30px rgba(0,0,0,.35); color-scheme:dark;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 var(--sans);-webkit-font-smoothing:antialiased}
a{color:var(--teal);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
h1,h2,h3{font-family:var(--serif);font-weight:500;letter-spacing:-.01em;margin:0}
.muted{color:var(--muted)}
.skip{position:absolute;left:-999px;top:8px;background:var(--amber);color:#fff;padding:8px 12px;border-radius:6px}
.skip:focus{left:8px;z-index:100}

/* nav */
.nav{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:16px;padding:12px var(--gutter);
     background:color-mix(in srgb,var(--paper) 82%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--serif);font-size:19px;color:var(--ink);white-space:nowrap}
.brand-mark{width:16px;height:18px;background:var(--teal);clip-path:polygon(50% 0,100% 25%,100% 75%,50% 100%,0 75%,0 25%)}
.nav-links{margin-left:auto;display:flex;gap:18px;font-size:14px;overflow-x:auto;scrollbar-width:none}
.nav-links::-webkit-scrollbar{display:none}
.nav-links a{color:var(--ink-2);white-space:nowrap}
.nav-links a.active,.nav-links a:hover{color:var(--teal);text-decoration:none}
.theme-toggle{border:1px solid var(--line);background:var(--card);color:var(--ink);width:36px;height:36px;border-radius:50%;display:grid;place-items:center;cursor:pointer;flex:none}
.theme-toggle .moon{display:none}
:root[data-theme="dark"] .theme-toggle .sun{display:none}
:root[data-theme="dark"] .theme-toggle .moon{display:block}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]) .theme-toggle .sun{display:none}
  :root:not([data-theme="light"]) .theme-toggle .moon{display:block}
}

/* hero */
.hero{position:relative;overflow:hidden;padding:clamp(64px,12vw,140px) var(--gutter) clamp(48px,8vw,96px);border-bottom:1px solid var(--line)}
.lattice{position:absolute;inset:0;width:100%;height:100%;color:var(--teal);opacity:.16;pointer-events:none}
.hero-inner{position:relative;max-width:var(--max);margin:0 auto}
.eyebrow{font:500 12px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--amber);margin:0 0 18px}
.hero-name{font-size:clamp(44px,8vw,88px);line-height:1;font-weight:400}
.hero-alt{color:var(--muted);font-style:italic;font-weight:300;font-size:.5em}
.hero-tagline{font-family:var(--serif);font-size:clamp(20px,2.6vw,28px);font-weight:300;color:var(--ink-2);max-width:34ch;margin:22px 0 30px;line-height:1.3}
.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:999px;border:1px solid var(--line);background:var(--card);color:var(--ink);font-weight:500;font-size:15px}
.btn:hover{text-decoration:none;border-color:var(--teal);color:var(--teal)}
.btn.primary{background:var(--teal);border-color:var(--teal);color:#fff}
.btn.primary:hover{background:var(--teal-2);color:#fff}
.hero-links{display:flex;gap:14px;margin-left:6px;font-size:14px}
.now{margin-top:40px;display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.now .lbl{font:500 11px var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-right:4px}
.chip{font-size:13px;padding:6px 12px;border-radius:999px;background:var(--teal-soft);color:var(--teal-2);border:1px solid color-mix(in srgb,var(--teal) 25%,transparent)}

/* sections */
.section{max-width:var(--max);margin:0 auto;padding:clamp(56px,8vw,96px) var(--gutter) 0}
.section-head{display:grid;grid-template-columns:auto 1fr;column-gap:14px;align-items:baseline;margin-bottom:28px}
.section-head .num{font:500 12px var(--mono);color:var(--amber);letter-spacing:.1em}
.section-head h2{font-size:clamp(28px,4vw,38px)}
.section-head .lede{grid-column:2;margin:6px 0 0;color:var(--muted);max-width:60ch}
.sup{color:var(--amber);font-weight:600}

/* about */
.about-grid{display:grid;grid-template-columns:1.6fr 1fr;gap:40px}
.about-text{font-family:var(--serif);font-size:20px;line-height:1.55;color:var(--ink-2)}
.about-text p{margin:0 0 1em}
.about-side h3{font-size:13px;font-family:var(--mono);font-weight:500;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 10px}
.about-side h3+*{margin-bottom:26px}
.interests{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.interests li{padding-left:18px;position:relative}
.interests li::before{content:"";position:absolute;left:0;top:.62em;width:9px;height:10px;background:var(--amber);clip-path:polygon(50% 0,100% 25%,100% 75%,50% 100%,0 75%,0 25%)}
.facts{margin:0;display:grid;grid-template-columns:auto 1fr;gap:6px 14px;font-size:15px}
.facts dt{color:var(--muted)}
.facts dd{margin:0}
@media (max-width:760px){.about-grid{grid-template-columns:1fr;gap:28px}.about-text{font-size:18px}}

/* cards */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}
.card{position:relative;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:10px;transition:transform .2s,border-color .2s}
.card:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--teal) 40%,var(--line))}
.card .period{font:500 12px var(--mono);color:var(--amber);letter-spacing:.08em}
.card h3{font-size:22px;line-height:1.2}
.card p{margin:0;color:var(--ink-2);font-size:15px}
.card img{width:100%;border-radius:8px;aspect-ratio:16/9;object-fit:cover;border:1px solid var(--line)}
.tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:auto}
.tag{font:500 12px var(--mono);padding:3px 9px;border-radius:6px;background:var(--paper-2);color:var(--ink-2);border:1px solid var(--line)}
.card .links{display:flex;gap:12px;font-size:14px}

/* process-flow timeline */
.flow{position:relative;display:grid;gap:0}
.flow .stage{display:grid;grid-template-columns:72px 1fr;gap:0 22px;position:relative;padding-bottom:30px}
.unit{width:72px;height:62px;display:grid;place-items:center;color:var(--teal);position:relative}
.unit .pipe{position:absolute;left:35px;top:62px;height:calc(100% + 30px - 62px);width:2px;background:repeating-linear-gradient(to bottom,var(--teal) 0 6px,transparent 6px 11px);opacity:.6}
.unit .pipe::after{content:"";position:absolute;left:-5px;bottom:-2px;border:6px solid transparent;border-top:8px solid var(--teal);opacity:1}
.flow .stage:last-child .pipe{display:none}
.unit svg{width:60px;height:56px;overflow:visible}
.unit .k{font:600 11px var(--mono);fill:currentColor}
.stage .body{padding-top:4px}
.stage .when{font:500 12px var(--mono);color:var(--amber);letter-spacing:.08em}
.stage h3{font-size:21px;margin:2px 0 2px}
.stage .where{color:var(--muted);font-size:15px}
.stage ul{margin:8px 0 0;padding-left:18px;color:var(--ink-2);font-size:15px}
.stage li{margin:2px 0}
.stage li::marker{color:var(--amber)}
.stage .kind{display:inline-block;font:500 11px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--teal);background:var(--teal-soft);padding:2px 8px;border-radius:4px;margin-left:8px;vertical-align:middle}
@media (max-width:560px){.flow .stage{grid-template-columns:56px 1fr;gap:0 14px}.unit{width:56px}.unit svg{width:48px}.unit .pipe{left:27px}}

/* publications */
.pubgroup{margin-bottom:28px}
.pubgroup h3{font:500 13px var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 12px;padding-bottom:8px;border-bottom:1px solid var(--line)}
.pub{display:grid;grid-template-columns:34px 1fr;gap:12px;padding:12px 0;border-bottom:1px dashed var(--line)}
.pub .idx{font:500 13px var(--mono);color:var(--muted);padding-top:3px}
.pub .authors b{color:var(--ink);font-weight:600}
.pub .title{font-family:var(--serif);font-size:19px;line-height:1.3;margin:2px 0}
.pub .venue{color:var(--ink-2);font-size:15px}
.pub .meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px;align-items:center;font-size:13px}
.badge{font:600 11px var(--mono);letter-spacing:.08em;text-transform:uppercase;padding:3px 8px;border-radius:5px;background:var(--amber-soft);color:var(--amber);border:1px solid color-mix(in srgb,var(--amber) 35%,transparent)}
.badge.status{background:var(--paper-2);color:var(--muted);border-color:var(--line)}
.empty{color:var(--muted);font-style:italic;padding:14px 0}

/* honors */
.honors-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px}
.hcol h3{font:500 13px var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 12px;padding-bottom:8px;border-bottom:1px solid var(--line)}
.hitem{display:grid;grid-template-columns:1fr auto;gap:4px 12px;padding:9px 0;border-bottom:1px dashed var(--line)}
.hitem .t{font-weight:500}
.hitem .s{grid-column:1;color:var(--muted);font-size:14px}
.hitem .d{font:500 12px var(--mono);color:var(--amber);white-space:nowrap}

/* periodic table of skills */
.ptable{display:grid;grid-template-columns:repeat(auto-fill,minmax(112px,1fr));gap:8px}
.ptable .fam{grid-column:1/-1;font:500 12px var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-top:14px}
.ptable .fam:first-child{margin-top:0}
.el{aspect-ratio:1/1;border-radius:8px;padding:9px 10px;display:flex;flex-direction:column;justify-content:space-between;border:1px solid var(--line);background:var(--card);position:relative;overflow:hidden;transition:transform .15s}
.el:hover{transform:translateY(-2px)}
.el::before{content:"";position:absolute;inset:0 0 auto 0;height:4px;background:var(--c)}
.el .z{font:500 10px var(--mono);color:var(--muted)}
.el .sym{font-family:var(--serif);font-size:30px;line-height:1;color:var(--c)}
.el .nm{font-size:11.5px;line-height:1.2;color:var(--ink-2);word-break:break-word}
.langs{margin-top:28px;display:flex;flex-wrap:wrap;gap:12px}
.lang{border:1px solid var(--line);border-radius:10px;padding:10px 14px;background:var(--card);font-size:14px}
.lang b{font-weight:600;margin-right:6px}

/* cv + contact */
.cv-box,.contact-box{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:26px;box-shadow:var(--shadow)}
.cv-box p,.contact-box p{margin:0 0 16px;color:var(--ink-2);font-family:var(--serif);font-size:19px}
.cv-actions,.contact-links{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.contact-links a.btn{font-size:14px}

/* placeholders: anything still marked TODO in profile.yaml, or example entries */
.todo{border-bottom:2px dotted var(--amber);cursor:help}
.example::after{content:"example";position:absolute;top:10px;right:10px;font:600 10px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--amber);background:var(--amber-soft);padding:2px 6px;border-radius:4px}
.example{position:relative}
.hitem.example::after{position:static;grid-column:2;grid-row:2;justify-self:end;align-self:start}
.stage.example::after{top:0;right:0}

.footer{max-width:var(--max);margin:80px auto 0;padding:24px var(--gutter) 40px;border-top:1px solid var(--line);display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:14px}

@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}.card,.el{transition:none}}