/* ============================================================
   Tokens
   ============================================================ */
:root{
  --ink:#0e141b;--ink-2:#3d4757;--muted:#7b8698;--line:#e4e8ef;
  --paper:#f7f9fc;--card:#fff;
  --blue:#2f6bff;--blue-soft:#eaf0ff;--violet:#7a5cff;--mint:#00b389;
  --max:1240px;--pad:max(54px,calc((100vw - var(--max))/2));--head:74px;
  --ease:cubic-bezier(.16,1,.3,1);--ease-io:cubic-bezier(.65,0,.35,1);
  --r-lg:22px;--r-md:16px;
  --shadow:0 8px 30px rgba(20,35,70,.06);
  --shadow-lift:0 22px 50px rgba(20,35,70,.12);
  --t:var(--blue);--t-soft:var(--blue-soft);
}
.track-sec{--t:var(--blue);--t-soft:#eaf0ff}
.track-ai{--t:var(--violet);--t-soft:#f1ecff}
.track-ops{--t:#0a9d7d;--t-soft:#e3f7f1}

*{box-sizing:border-box}
html{
  scroll-behavior:smooth;scroll-snap-type:y mandatory;
  scrollbar-width:none;background:var(--paper);
}
html::-webkit-scrollbar{width:0}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:"Noto Sans KR",system-ui,-apple-system,sans-serif;
  font-size:clamp(14px,1.55vmin,16px);line-height:1.6;letter-spacing:-.015em;word-break:keep-all;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
body.modal-open{overflow:hidden}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;border:0;background:none;cursor:pointer}
h1,h2,h3{margin:0;font-family:"Space Grotesk","Noto Sans KR",sans-serif;font-weight:600;letter-spacing:-.035em;line-height:1.06}
h4{margin:0}
p{margin:0}
img{display:block;max-width:100%}
.material-symbols-outlined{font-size:inherit;line-height:1}
.skip-link{position:fixed;top:-90px;left:18px;z-index:999;padding:12px 18px;border-radius:12px;background:var(--ink);color:#fff;font-weight:600}
.skip-link:focus{top:16px}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:6px}

/* ============================================================
   Backdrop
   ============================================================ */
.backdrop{position:fixed;inset:0;z-index:0;overflow:hidden;pointer-events:none;contain:strict}
/* radial-gradient 자체가 이미 부드럽기 때문에 filter:blur 를 쓰지 않는다 (저사양 GPU에서 가장 비싼 연산) */
.aurora{position:absolute;border-radius:50%;opacity:.72;transition:transform 1.2s var(--ease),opacity 1.2s var(--ease)}
.aurora-1{width:56vw;height:56vw;left:-14vw;top:-18vw;background:radial-gradient(circle,#c9dcff 0,rgba(201,220,255,.55) 38%,rgba(201,220,255,0) 70%);transform:translate3d(calc(var(--pi,0) * 7vw),calc(var(--pi,0) * 4vh),0)}
.aurora-2{width:50vw;height:50vw;right:-12vw;top:14vh;background:radial-gradient(circle,#e3d9ff 0,rgba(227,217,255,.5) 40%,rgba(227,217,255,0) 72%);transform:translate3d(calc(var(--pi,0) * -6vw),calc(var(--pi,0) * -3vh),0)}
.aurora-3{width:44vw;height:44vw;left:30vw;bottom:-20vw;background:radial-gradient(circle,#d6f4ea 0,rgba(214,244,234,.5) 40%,rgba(214,244,234,0) 74%);opacity:.55;transform:translate3d(calc(var(--pi,0) * -4vw),calc(var(--pi,0) * -5vh),0)}
.mesh{position:absolute;inset:0;background-image:radial-gradient(rgba(23,42,86,.09) 1px,transparent 1px);background-size:26px 26px;-webkit-mask-image:radial-gradient(ellipse 80% 70% at 50% 45%,#000 20%,transparent 78%);mask-image:radial-gradient(ellipse 80% 70% at 50% 45%,#000 20%,transparent 78%);opacity:.5}

.scroll-progress{position:fixed;inset:0 0 auto;z-index:120;height:2px}
.scroll-progress i{display:block;height:100%;width:var(--p,0%);background:linear-gradient(90deg,var(--blue),var(--violet));transition:width .25s linear}

/* ============================================================
   Header
   ============================================================ */
.site-header{
  position:fixed;inset:0 0 auto;z-index:110;display:flex;align-items:center;justify-content:space-between;
  height:var(--head);padding:0 var(--pad);
  transition:background .4s var(--ease),box-shadow .4s var(--ease)
}
.site-header.scrolled{background:rgba(247,249,252,.88);backdrop-filter:blur(10px);box-shadow:0 1px 0 rgba(16,30,60,.06)}
.brand{display:flex;align-items:center;gap:10px}
.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:11px;background:linear-gradient(135deg,var(--blue),var(--violet));color:#fff;font-size:19px;box-shadow:0 8px 18px rgba(47,107,255,.28)}
.brand-text{display:flex;flex-direction:column;font-family:"Space Grotesk",sans-serif;font-weight:600;font-size:13.5px;letter-spacing:.02em}
.brand-text small{color:var(--muted);font-size:9.5px;letter-spacing:.14em;font-weight:500}
.nav-links{display:flex;align-items:center;gap:clamp(14px,1.9vw,30px)}
.nav-links a{position:relative;color:var(--ink-2);font-size:13.5px;font-weight:600;transition:color .25s}
.nav-links a:not(.nav-cta)::after{content:"";position:absolute;left:0;bottom:-6px;width:100%;height:2px;border-radius:2px;background:var(--blue);transform:scaleX(0);transform-origin:left;transition:transform .45s var(--ease)}
.nav-links a:hover{color:var(--ink)}
.nav-links a:not(.nav-cta):hover::after,.nav-links a.active::after{transform:scaleX(1)}
.nav-links a.active{color:var(--ink)}
.nav-cta{display:inline-flex;align-items:center;gap:6px;padding:9px 16px;border-radius:12px;background:var(--ink);color:#fff!important;font-size:13px;transition:transform .3s var(--ease),box-shadow .3s var(--ease)}
.nav-cta:hover{transform:translateY(-2px);box-shadow:0 10px 22px rgba(14,20,27,.22)}
.nav-cta .material-symbols-outlined{font-size:15px}
.menu-button{display:none;width:40px;height:40px;border-radius:12px}
.menu-button span{display:block;width:18px;height:2px;margin:4px auto;border-radius:2px;background:var(--ink);transition:transform .35s var(--ease)}
.menu-button.open span:first-child{transform:translateY(3px) rotate(45deg)}
.menu-button.open span:last-child{transform:translateY(-3px) rotate(-45deg)}

/* ============================================================
   Section pager
   ============================================================ */
.pager{position:fixed;right:clamp(12px,1.6vw,26px);top:50%;z-index:105;display:flex;flex-direction:column;gap:12px;transform:translateY(-50%)}
.pager button{position:relative;display:grid;place-items:center;width:26px;height:10px;transition:height .45s var(--ease)}
.pager button[aria-current="true"]{height:22px}
.pager button i{display:block;width:7px;height:7px;border-radius:99px;background:rgba(19,32,56,.22);transition:height .45s var(--ease),background .35s}
.pager button:hover i{background:rgba(19,32,56,.45)}
.pager button[aria-current="true"] i{height:22px;background:linear-gradient(180deg,var(--blue),var(--violet))}
.pager button span{
  position:absolute;right:22px;top:50%;padding:5px 10px;border-radius:8px;white-space:nowrap;
  background:var(--ink);color:#fff;font-size:11px;font-weight:600;
  opacity:0;transform:translate(6px,-50%);transition:opacity .3s,transform .3s var(--ease);pointer-events:none
}
.pager button:hover span,.pager button:focus-visible span{opacity:1;transform:translate(0,-50%)}

/* ============================================================
   Page shell — presentation-style slide transition
   ============================================================ */
main{position:relative;z-index:1}
.page{
  position:relative;height:100svh;min-height:600px;display:grid;align-content:center;
  padding:calc(var(--head) + 3vmin) var(--pad) 5vmin;overflow:hidden;perspective:1400px;
  scroll-snap-align:start;scroll-snap-stop:always
}
/* will-change 를 상시로 두면 섹션 6개가 모두 큰 GPU 레이어로 남아 저사양 PC에서 느려진다.
   활성 섹션에만 붙인다. */
.page-inner{width:100%;max-width:var(--max);margin:0 auto}
.js .page-inner{
  opacity:calc(1 - var(--a,0) * 1.25);
  transform:translate3d(0,calc(var(--p,0) * 17vh),0) scale(calc(1 - var(--a,0) * .11)) rotateX(calc(var(--p,0) * 5deg))
}
.js .page.is-active .page-inner{will-change:opacity,transform}

/* headline mask reveal */
.line{display:block;overflow:hidden;padding-bottom:.09em;margin-bottom:-.09em}
.line>i{display:block;font-style:normal}
.js .line>i{transform:translate3d(0,116%,0);transition:transform .7s var(--ease) var(--d,0s)}
.js .page.is-active .line>i{transform:none}
.line:nth-child(2)>i{--d:.12s}
.line:nth-child(3)>i{--d:.24s}

/* staggered reveal */
.js .reveal{opacity:0;transform:translate3d(0,18px,0);transition:opacity .55s var(--ease) var(--d,0s),transform .55s var(--ease) var(--d,0s)}
.js .page.is-active .reveal,.js .reveal.visible{opacity:1;transform:translate3d(0,0,0)}
.d1{--d:.05s}.d2{--d:.1s}.d3{--d:.15s}.d4{--d:.2s}.d5{--d:.26s}.d6{--d:.32s}

/* pointer tilt (declared after reveal so it wins) */
[data-tilt]{transition:transform .5s var(--ease),box-shadow .5s var(--ease),border-color .3s}
.js .page.is-active [data-tilt]{transform:perspective(900px) rotateX(var(--rx,0deg)) rotateY(var(--ry,0deg)) translate3d(0,var(--lift,0px),0)}

/* section head */
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:22px;margin-bottom:clamp(16px,2.6vmin,34px)}
.section-head h2{font-size:clamp(30px,5.2vmin,56px)}
.eyebrow{color:var(--blue);font-size:clamp(11px,1.35vmin,13px);font-weight:700;letter-spacing:.14em;text-transform:uppercase;margin-bottom:10px}
.section-note{color:var(--muted);font-size:clamp(11px,1.4vmin,13px);font-weight:500;text-align:right;padding-bottom:8px}
.gradient{background:linear-gradient(100deg,var(--blue),var(--violet) 60%,#00b3c4);-webkit-background-clip:text;background-clip:text;color:transparent}

/* buttons */
.button{display:inline-flex;align-items:center;gap:7px;padding:clamp(10px,1.5vmin,14px) clamp(16px,2.2vmin,22px);border-radius:14px;border:1px solid var(--line);background:#fff;font-size:clamp(13px,1.6vmin,14.5px);font-weight:600;transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .3s}
.button .material-symbols-outlined{font-size:17px;transition:transform .35s var(--ease)}
.button:hover{transform:translateY(-3px);box-shadow:var(--shadow-lift);border-color:transparent}
.button.primary{background:linear-gradient(120deg,var(--blue),#5a4bff);color:#fff;border-color:transparent;box-shadow:0 12px 26px rgba(47,107,255,.26)}
.button.primary:hover .material-symbols-outlined{transform:translateY(3px)}
.button.ghost{background:transparent}

/* ============================================================
   01 · Hero
   ============================================================ */
.hero-grid{display:grid;grid-template-columns:minmax(0,1.06fr) minmax(0,.94fr);gap:clamp(20px,4vmin,52px) clamp(28px,4vw,64px);align-items:center}
.status-pill{display:inline-flex;align-items:center;gap:8px;padding:7px 14px;border-radius:99px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);font-size:clamp(11px,1.4vmin,12.5px);font-weight:600;color:var(--ink-2)}
.status-dot{width:7px;height:7px;border-radius:50%;background:var(--mint);box-shadow:0 0 0 0 rgba(0,179,137,.5);animation:ping 2.4s infinite}
@keyframes ping{70%{box-shadow:0 0 0 8px rgba(0,179,137,0)}100%{box-shadow:0 0 0 0 rgba(0,179,137,0)}}
.hero-kicker{margin:clamp(12px,2vmin,22px) 0 clamp(6px,1.2vmin,12px);color:var(--ink-2);font-size:clamp(14px,1.85vmin,17px);font-weight:600}
.hero h1{font-size:clamp(32px,5.9vmin,64px);letter-spacing:-.05em}
.hero-lead{margin-top:clamp(14px,2.2vmin,24px);color:var(--ink-2);font-size:clamp(15px,2vmin,19px);font-weight:500}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:clamp(16px,2.6vmin,30px)}

.hero-visual{position:relative;aspect-ratio:4/4.4;max-height:54svh;margin-left:auto;width:100%;max-width:400px}
.portrait-frame{position:relative;height:100%;border-radius:28px;overflow:hidden;background:#e8edf6;box-shadow:0 30px 70px rgba(24,42,80,.16)}
.portrait-frame::after{content:"";position:absolute;inset:0;background:linear-gradient(190deg,rgba(47,107,255,.14),rgba(122,92,255,.05) 45%,rgba(255,255,255,0))}
.portrait-frame img{height:100%;width:100%;object-fit:cover;object-position:center 18%;filter:saturate(.94) contrast(1.02);transform:scale(calc(1 + var(--a,0) * .05));transition:transform .6s var(--ease)}
.orbit{position:absolute;left:50%;top:50%;border:1px solid rgba(47,107,255,.16);border-radius:50%;transform:translate(-50%,-50%)}
.orbit-a{width:126%;height:88%;animation:spin 34s linear infinite}
.orbit-b{width:88%;height:124%;border-color:rgba(122,92,255,.14);animation:spin 46s linear infinite reverse}
@keyframes spin{to{transform:translate(-50%,-50%) rotate(360deg)}}

.proof-strip{grid-column:1/-1;display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(8px,1.4vmin,16px);padding:clamp(12px,1.9vmin,20px) clamp(14px,2.2vmin,26px);border-radius:var(--r-lg);background:rgba(255,255,255,.8);border:1px solid var(--line);backdrop-filter:blur(10px);box-shadow:var(--shadow)}
.proof-item{display:flex;flex-direction:column;gap:3px;padding-left:14px;border-left:2px solid var(--blue-soft)}
.proof-item strong{font-family:"Space Grotesk",sans-serif;font-size:clamp(13px,1.85vmin,17px);letter-spacing:-.02em}
.proof-item strong b{color:var(--blue);font-weight:inherit;font-variant-numeric:tabular-nums}
.proof-item span{color:var(--muted);font-size:clamp(10.5px,1.35vmin,12.5px)}

.scroll-cue{position:absolute;left:50%;bottom:2.4vmin;display:flex;flex-direction:column;align-items:center;gap:8px;color:var(--muted);font-size:10px;font-weight:700;letter-spacing:.22em;transform:translateX(-50%)}
.scroll-cue i{display:block;width:1px;height:34px;background:linear-gradient(180deg,var(--blue),transparent);animation:cue 2.2s var(--ease-io) infinite}
@keyframes cue{0%{transform:scaleY(.2);transform-origin:top}45%{transform:scaleY(1);transform-origin:top}46%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

/* ============================================================
   02 · Projects — Case Study (팀 / 개인 그룹)
   ============================================================ */
.filter-bar{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:7px}
.chip{position:relative;display:inline-flex;align-items:center;padding:clamp(6px,1vmin,9px) clamp(12px,1.7vmin,17px);border-radius:99px;border:1px solid var(--line);background:#fff;color:var(--ink-2);font-size:clamp(11px,1.4vmin,13px);font-weight:600;cursor:default;user-select:none;overflow:hidden;transition:transform .35s var(--ease),background .45s var(--ease),color .45s var(--ease),border-color .35s,box-shadow .45s var(--ease)}
.chip::after{content:"";position:absolute;left:12px;right:12px;bottom:3px;height:2px;border-radius:2px;background:currentColor;opacity:.4;transform:scaleX(0);transform-origin:left;transition:transform .18s ease}
.chip:hover,.chip:focus-visible{transform:translateY(-2px);border-color:rgba(47,107,255,.35);outline:none}
.chip.is-arming::after{transform:scaleX(1);transition:transform .3s linear}
.chip.is-on{background:var(--ink);border-color:transparent;color:#fff;box-shadow:0 10px 22px rgba(14,20,27,.18)}
.chip.is-on::after{opacity:0}

.project-groups{display:flex;flex-direction:column;gap:clamp(14px,2.2vmin,26px)}
.group-head{display:flex;align-items:baseline;gap:12px;margin-bottom:clamp(9px,1.4vmin,14px)}
.group-head h3{font-size:clamp(13px,1.7vmin,16px);letter-spacing:-.025em}
.group-head i{flex:1;height:1px;background:var(--line)}

.lead-row{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(10px,1.5vmin,18px)}
.b-card{position:relative;display:flex;flex-direction:column;min-height:clamp(190px,26vmin,280px);padding:clamp(16px,2.3vmin,26px);border-radius:20px;background:linear-gradient(165deg,#fff,var(--t-soft));border:1px solid var(--line);cursor:pointer;overflow:hidden;box-shadow:0 4px 16px rgba(20,35,70,.04)}
.b-card::after{content:"";position:absolute;inset:auto -25% -60% -25%;height:150px;background:radial-gradient(circle,var(--t-soft),transparent 70%);opacity:0;transition:opacity .5s}
.b-card:hover{--lift:-6px;border-color:var(--t);box-shadow:0 26px 54px rgba(20,35,70,.14)}
.b-card:hover::after{opacity:1}
.b-top{display:flex;align-items:center;justify-content:space-between;color:var(--t);font-size:clamp(10.5px,1.35vmin,12px);font-weight:700}
.b-top em{font-style:normal;font-family:"Space Grotesk",sans-serif;color:#c3cbd8;font-size:clamp(12px,1.7vmin,15px)}
.b-card>.b-headline{margin-top:clamp(12px,1.9vmin,20px);color:var(--ink-2);font-size:clamp(18px,2.7vmin,27px);font-weight:700;line-height:1.4;letter-spacing:-.04em;word-break:keep-all;text-wrap:balance}
.b-headline mark{white-space:nowrap;padding:0 .08em;color:var(--t);font-weight:800;background:linear-gradient(transparent 56%,color-mix(in srgb,var(--t) 26%,transparent) 0)}
.b-headline mark.num{padding:0 .02em;font-family:"Space Grotesk","Noto Sans KR",sans-serif;font-size:1.8em;line-height:.9;letter-spacing:-.05em;background:none}
.b-headline mark b{font-weight:inherit;font-variant-numeric:tabular-nums}
.b-card h3{margin-top:clamp(12px,1.8vmin,20px);padding-top:clamp(10px,1.5vmin,16px);border-top:1px solid color-mix(in srgb,var(--t) 16%,var(--line));font-size:clamp(13px,1.75vmin,16px)}
.b-card>p{margin-top:6px;color:var(--ink-2);font-size:clamp(11.5px,1.45vmin,13px);line-height:1.55}
.b-open{display:inline-flex;align-items:center;gap:6px;margin-top:auto;padding-top:clamp(10px,1.5vmin,16px);color:var(--t);font-size:clamp(10.5px,1.35vmin,12px);font-weight:700}
.b-open-text{background-size:280% 100%;background-position:0 0}
.b-card:hover .b-open-text,.b-card:focus-visible .b-open-text{background-image:linear-gradient(90deg,#ff4d6d,#ff9f43,#ffd93d,#2ee6a8,#4facfe,#a06cff,#ff4d6d);-webkit-background-clip:text;background-clip:text;color:transparent;animation:rainbow 1.6s linear infinite;filter:drop-shadow(0 0 7px rgba(160,108,255,.3))}
@keyframes rainbow{to{background-position:280% 0}}
.b-open .material-symbols-outlined{font-size:16px;transition:transform .4s var(--ease)}
.b-card:hover .b-open .material-symbols-outlined{transform:translateX(4px)}

.mini-row{display:grid;gap:clamp(8px,1.2vmin,12px);margin-top:clamp(8px,1.2vmin,12px)}
.mini-row.cols{grid-template-columns:repeat(8,minmax(0,1fr));margin-top:0}
.b-mini.is-featured{grid-column:span 2;border:1px solid transparent;background:linear-gradient(135deg,#fff 35%,#f1edff) padding-box,linear-gradient(120deg,#7a5cff,#2f6bff 55%,#0a9d7d) border-box;box-shadow:0 10px 26px rgba(122,92,255,.14)}
.b-mini.is-featured em{color:#7a5cff}
.b-mini.is-featured strong{font-size:clamp(13px,1.75vmin,15.5px)}
.b-mini.is-featured:hover{box-shadow:0 18px 38px rgba(122,92,255,.24)}
.b-flag{display:inline-flex;align-items:center;gap:4px;width:fit-content;margin-bottom:5px;padding:2px 8px 2px 6px;border-radius:99px;background:linear-gradient(90deg,#7a5cff,#2f6bff);color:#fff;font-style:normal;font-size:clamp(9px,1.1vmin,10.5px);font-weight:700;letter-spacing:.02em}
.b-flag .material-symbols-outlined{font-size:12px}
.mini-row.cols .b-mini{display:grid;grid-template-columns:1fr auto;grid-template-areas:"num arrow" "body body";align-items:center;gap:4px 8px;padding:clamp(12px,1.7vmin,17px) clamp(12px,1.7vmin,16px)}
.mini-row.cols .b-mini em{grid-area:num}
.mini-row.cols .b-mini>.material-symbols-outlined{grid-area:arrow;margin-left:0;font-size:16px}
.mini-row.cols .b-mini>div{grid-area:body}
.mini-row.cols .b-mini strong{font-size:clamp(11.5px,1.5vmin,13.5px);line-height:1.3}
.mini-row.cols .b-mini>div>span{margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.b-mini{display:flex;align-items:center;gap:12px;padding:clamp(11px,1.6vmin,16px) clamp(13px,1.8vmin,18px);border-radius:14px;background:#fff;border:1px solid var(--line);cursor:pointer;transition:transform .4s var(--ease),border-color .3s,box-shadow .4s var(--ease)}
.b-mini:hover{transform:translateY(-3px);border-color:var(--t);box-shadow:0 14px 30px rgba(20,35,70,.09)}
.b-mini em{flex:none;font-style:normal;font-family:"Space Grotesk",sans-serif;font-size:clamp(11.5px,1.5vmin,13px);color:#c3cbd8}
.b-mini>div{min-width:0}
.b-mini strong{display:block;font-size:clamp(12px,1.6vmin,14px)}
.b-mini>div>span{display:block;color:var(--muted);font-size:clamp(10px,1.25vmin,11.5px);line-height:1.45}
.b-mini>.material-symbols-outlined{margin-left:auto;flex:none;color:var(--muted);font-size:18px;transition:transform .35s var(--ease),color .3s}
.b-mini:hover>.material-symbols-outlined{color:var(--t);transform:translateX(3px)}
.js .project-groups [data-project]{filter:grayscale(0) opacity(1);transition:opacity .55s var(--ease) var(--d,0s),transform .55s var(--ease) var(--d,0s),filter .38s var(--ease),border-color .3s var(--ease),box-shadow .35s var(--ease)}
.project-groups.is-focus [data-project]:not(.is-match){filter:grayscale(1) opacity(.4)}
.project-groups.is-focus [data-project].is-match{border-color:var(--t);box-shadow:0 0 0 3px color-mix(in srgb,var(--t) 20%,transparent),0 16px 36px rgba(20,35,70,.12)}
.project-groups.is-focus .b-mini.is-featured.is-match{box-shadow:0 0 0 3px rgba(122,92,255,.22),0 16px 36px rgba(122,92,255,.2)}

/* ============================================================
   03 · Skills — 세로로 긴 박스 6개를 가로로 배치, 항목도 세로 정렬
   ============================================================ */
.skill-stack{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:clamp(8px,1.2vmin,14px);align-items:stretch}
.skill-row{display:flex;flex-direction:column;padding:clamp(13px,1.9vmin,20px) clamp(12px,1.7vmin,17px);border-radius:18px;background:#fff;border:1px solid var(--line);box-shadow:0 3px 14px rgba(20,35,70,.04);transition:transform .4s var(--ease),box-shadow .4s var(--ease),border-color .3s}
.skill-row:hover{transform:translateY(-4px);border-color:var(--t);box-shadow:0 18px 38px rgba(20,35,70,.1)}
.skill-head{display:flex;flex-direction:column;gap:9px;padding-bottom:clamp(11px,1.6vmin,15px);margin-bottom:clamp(11px,1.6vmin,15px);border-bottom:1px solid var(--line)}
.cluster-icon{display:grid;place-items:center;width:clamp(30px,3.9vmin,36px);height:clamp(30px,3.9vmin,36px);border-radius:11px;background:var(--t-soft);color:var(--t);font-size:clamp(17px,2.2vmin,20px)}
.skill-head h3{font-size:clamp(11.5px,1.5vmin,13.5px);letter-spacing:-.025em;line-height:1.3}
.skill-items{display:flex;flex-direction:column;flex:1;gap:clamp(9px,1.35vmin,14px)}
.skill-item{display:flex;flex-direction:column;flex:1 1 auto;max-height:clamp(46px,7.2vmin,64px)}

.si-top{display:flex;align-items:baseline;justify-content:space-between;gap:6px}
.si-name{min-width:0;color:var(--ink-2);font-size:clamp(10.5px,1.35vmin,12.5px);font-weight:600;line-height:1.35;overflow-wrap:anywhere}
.si-val{flex:none;color:var(--t);font-family:"Space Grotesk",sans-serif;font-size:clamp(10px,1.3vmin,12px);font-weight:600;font-variant-numeric:tabular-nums}
.si-val::after{content:"%";opacity:.5;font-size:.82em;margin-left:1px}
.si-bar{display:block;height:7px;margin-top:6px;border-radius:99px;background:#edf0f6;overflow:hidden}
.si-bar s{display:block;height:100%;width:0;border-radius:99px;text-decoration:none;background:linear-gradient(90deg,var(--t),color-mix(in srgb,var(--t) 42%,#fff));box-shadow:0 1px 6px rgba(20,35,70,.14);transition:width .9s var(--ease) var(--sd,0s)}
.js .page.is-active .si-bar s,.js .skill-item.visible .si-bar s{width:var(--lvl,0%)}

/* ============================================================
   04 · History
   ============================================================ */
.timeline{position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(10px,1.6vmin,20px);padding-top:34px}
.timeline-rail{position:absolute;left:0;right:0;top:10px;height:2px;border-radius:2px;background:var(--line);overflow:hidden}
.timeline-rail i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--blue),var(--violet));transition:width 1.6s var(--ease) .25s}
.page.is-active .timeline-rail i{width:100%}
.timeline-item{position:relative;padding:clamp(14px,2vmin,22px);border-radius:var(--r-md);background:#fff;border:1px solid var(--line);box-shadow:0 4px 16px rgba(20,35,70,.04);transition:transform .45s var(--ease),box-shadow .45s var(--ease)}
.timeline-item:hover{transform:translateY(-4px);box-shadow:var(--shadow-lift)}
.timeline-item .node{position:absolute;left:24px;top:-28px;width:11px;height:11px;border-radius:50%;background:#fff;border:2px solid var(--blue)}
.timeline-item.current .node{background:var(--blue);box-shadow:0 0 0 0 rgba(47,107,255,.4);animation:ping 2.4s infinite}
.timeline-item time{display:block;color:var(--muted);font-family:"Space Grotesk",sans-serif;font-size:clamp(10.5px,1.35vmin,12px)}
.timeline-item h3{margin:8px 0 6px;font-size:clamp(13.5px,1.9vmin,17px)}
.timeline-item p{color:var(--ink-2);font-size:clamp(11.5px,1.45vmin,13px)}
.timeline-item ul{margin:10px 0 0;padding-left:15px;color:var(--muted);font-size:clamp(11px,1.35vmin,12.5px)}
.timeline-item ul li{margin-top:3px}
.timeline-item.current{background:linear-gradient(150deg,#fff,#eef3ff);border-color:rgba(47,107,255,.22)}

/* ============================================================
   05 · Credentials
   ============================================================ */
.credentials-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(10px,1.6vmin,18px)}
.credential-panel{padding:clamp(16px,2.4vmin,28px);border-radius:var(--r-lg);background:#fff;border:1px solid var(--line);box-shadow:var(--shadow)}
.credential-panel h3{margin-bottom:clamp(12px,1.8vmin,18px);font-size:clamp(14px,1.9vmin,17px)}
.award-list{display:flex;flex-direction:column;gap:clamp(8px,1.3vmin,12px)}
.award-row{display:flex;align-items:center;gap:12px;padding:clamp(10px,1.5vmin,14px);border-radius:13px;background:var(--paper);transition:transform .4s var(--ease),background .3s}
.award-row:hover{transform:translateX(4px);background:var(--blue-soft)}
.award-row .material-symbols-outlined{color:var(--blue);font-size:20px}
.award-row strong{display:block;font-size:clamp(12px,1.6vmin,14px)}
.award-row span{color:var(--muted);font-size:clamp(10.5px,1.3vmin,12px)}
.cert-list{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(7px,1.2vmin,11px)}
.cert-row{display:flex;align-items:center;gap:10px;padding:clamp(9px,1.4vmin,13px) clamp(11px,1.6vmin,15px);border-radius:12px;background:var(--paper);transition:background .3s,transform .4s var(--ease)}
.cert-row:hover{background:var(--blue-soft);transform:translateY(-2px)}
.cert-row time{color:var(--blue);font-family:"Space Grotesk",sans-serif;font-size:clamp(10.5px,1.35vmin,12px);font-weight:600}
.cert-row strong{font-size:clamp(11.5px,1.5vmin,13.5px);font-weight:600}

/* ============================================================
   06 · Contact
   ============================================================ */
.contact-page{text-align:center}
.contact-inner{display:flex;flex-direction:column;align-items:center;gap:clamp(14px,2.2vmin,26px)}
.contact-title{font-size:clamp(24px,4.8vmin,50px)}
.contact-links{display:flex;flex-wrap:wrap;justify-content:center;gap:10px}
.footer-row{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 22px;margin-top:clamp(10px,2vmin,24px);color:var(--muted);font-size:11.5px;letter-spacing:.06em}

/* ============================================================
   Project modal — 핵심 성과 → 데모 → 스택 → 역할 → GitHub
   ============================================================ */
.pmodal{position:fixed;inset:0;z-index:200;display:grid;place-items:center;padding:max(16px,3.5vmin)}
.pmodal[hidden]{display:none}
.pmodal-scrim{position:absolute;inset:0;background:rgba(12,19,32,.42);backdrop-filter:blur(6px);opacity:0;transition:opacity .4s var(--ease)}
.pmodal.is-open .pmodal-scrim{opacity:1}
.pmodal-card{
  position:relative;width:min(940px,100%);max-height:min(88svh,880px);overflow:auto;
  padding:clamp(22px,3.2vmin,40px);border-radius:26px;background:#fff;
  box-shadow:0 44px 96px rgba(12,24,48,.3);
  opacity:0;transform:translateY(26px) scale(.975);transition:opacity .42s var(--ease),transform .52s var(--ease)
}
.pmodal.is-open .pmodal-card{opacity:1;transform:none}
.pmodal-card::-webkit-scrollbar{width:14px}
.pmodal-card::-webkit-scrollbar-track{background:transparent;margin:30px 0}
.pmodal-card::-webkit-scrollbar-thumb{background:#d9dfe8;background-clip:padding-box;border:5px solid transparent;border-radius:99px}
.pmodal-card::-webkit-scrollbar-thumb:hover{background-color:#c1c9d6}
@supports (-moz-appearance:none){.pmodal-card{scrollbar-width:thin;scrollbar-color:#d9dfe8 transparent}}
.pmodal-close{position:absolute;top:14px;right:14px;z-index:3;display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:var(--paper);color:var(--ink-2);font-size:20px;transition:background .25s,transform .35s var(--ease)}
.pmodal-close:hover{background:var(--t-soft);color:var(--t);transform:rotate(90deg)}

.pmodal-head{padding-right:46px}
.pmodal-head em{font-style:normal;color:var(--t);font-size:12px;font-weight:700}
.pmodal-head h2{margin:10px 0 10px;font-size:clamp(22px,3.2vmin,32px)}
.pmodal-head p{color:var(--ink-2);font-size:clamp(13px,1.7vmin,15px);line-height:1.75}

.pmodal-impact{display:flex;align-items:center;gap:15px;margin-top:clamp(16px,2.2vmin,22px);padding:clamp(15px,2.1vmin,22px);border-radius:18px;background:linear-gradient(120deg,var(--t-soft),transparent);border:1px solid var(--line)}
.pmodal-impact[hidden]{display:none}
.pmodal-impact>.material-symbols-outlined{display:grid;place-items:center;width:46px;height:46px;flex:none;border-radius:14px;background:var(--t);color:#fff;font-size:23px;box-shadow:0 10px 20px rgba(20,35,70,.16)}
.pmodal-impact h4{margin-bottom:4px;color:var(--t);font-family:"Space Grotesk",sans-serif;font-size:10.5px;font-weight:700;letter-spacing:.14em;text-transform:uppercase}
.pmodal-impact p{font-size:clamp(14px,1.9vmin,18px);font-weight:600;letter-spacing:-.025em;line-height:1.5}

.pmodal-sec{margin-top:clamp(18px,2.4vmin,26px)}
.pmodal-sec[hidden]{display:none}
.pmodal-sec>h4,.pmodal-block h4{margin-bottom:10px;color:var(--muted);font-family:"Space Grotesk",sans-serif;font-size:10.5px;font-weight:600;letter-spacing:.14em;text-transform:uppercase}
.demo-frame{position:relative;aspect-ratio:16/10;border-radius:18px;overflow:hidden;border:1px solid var(--line);background:var(--paper)}
.demo-frame iframe{width:100%;height:100%;border:0;display:block}
.demo-frame .demo-open{position:absolute;right:12px;bottom:12px;display:inline-flex;align-items:center;gap:6px;padding:9px 14px;border-radius:11px;background:rgba(14,20,27,.86);color:#fff;font-size:12px;font-weight:600;backdrop-filter:blur(6px);transition:transform .3s var(--ease)}
.demo-frame .demo-open:hover{transform:translateY(-2px)}
.stack{display:flex;flex-wrap:wrap;gap:6px}
.stack span{padding:6px 11px;border-radius:9px;background:var(--t-soft);color:var(--t);font-size:12px;font-weight:600}
.pmodal-meta{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:8px}
.pmodal-meta div{display:flex;justify-content:space-between;gap:10px;padding:9px 13px;border-radius:11px;background:var(--paper);font-size:12.5px}
.pmodal-meta span{color:var(--muted)}
.pmodal-main{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(14px,2vmin,24px);margin-top:clamp(18px,2.4vmin,26px)}
.pmodal-block{padding:clamp(14px,1.9vmin,20px);border-radius:16px;background:var(--paper)}
.pmodal-block.wide{grid-column:1/-1}
.case-list{display:flex;flex-direction:column;gap:8px;margin:0;padding:0;list-style:none}
.case-list li{display:flex;gap:10px;color:var(--ink-2);font-size:clamp(12.5px,1.6vmin,14px);line-height:1.65}
.case-list li::before{content:"";flex:none;width:6px;height:6px;margin-top:.6em;border-radius:50%;background:var(--t)}
.case-flow{display:flex;flex-wrap:wrap;gap:7px}
.case-flow span{display:inline-flex;align-items:center;gap:8px;padding:8px 13px;border-radius:11px;background:#fff;border:1px solid var(--line);font-size:12px;font-weight:600}
.case-flow span:not(:last-child)::after{content:"→";color:var(--muted)}
.pmodal-links{display:flex;flex-wrap:wrap;gap:9px;margin-top:clamp(20px,2.6vmin,30px);padding-top:clamp(16px,2.2vmin,22px);border-top:1px solid var(--line)}
.pmodal-links a{display:inline-flex;align-items:center;gap:8px;padding:12px 19px;border-radius:13px;border:1px solid var(--line);background:#fff;font-size:13px;font-weight:600;transition:transform .35s var(--ease),border-color .3s,background .3s}
.pmodal-links a:hover{transform:translateY(-2px);border-color:var(--t)}
.pmodal-links a.primary{background:var(--ink);color:#fff;border-color:transparent}
.pmodal-links a.primary:hover{background:var(--t)}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-height:770px){
  .skill-items{gap:clamp(7px,1.05vmin,11px)}
  .skill-row{padding:clamp(11px,1.5vmin,15px) clamp(11px,1.5vmin,15px)}
  .skill-head{padding-bottom:9px;margin-bottom:9px}
}
@media (max-height:780px){
  .timeline-item ul{display:none}
  .hero-visual{max-height:44svh}
}
@media (max-width:1080px){
  .credentials-grid{grid-template-columns:1fr}
  .pmodal-main{grid-template-columns:1fr}
  .b-card{min-height:clamp(170px,23vmin,240px)}
  .mini-row.cols{grid-template-columns:repeat(3,1fr)}
  .skill-row{padding:clamp(11px,1.6vmin,16px) clamp(10px,1.4vmin,13px)}
  .skill-head{gap:7px}
  .modal-body{grid-template-columns:1fr}
}
@media (max-width:900px),(max-height:620px){
  :root{--pad:max(20px,calc((100vw - var(--max))/2))}
  html{scroll-snap-type:none;scroll-padding-top:var(--head)}
  .pager{display:none}
  .page{height:auto;min-height:auto;padding:calc(var(--head) + 26px) var(--pad) 56px}
  .js .page-inner{opacity:1;transform:none}
  .scroll-cue{display:none}
  .gauge{opacity:1}
  .gauge b{width:var(--lvl,0%)}
}
@media (max-width:900px){
  .site-header{background:rgba(247,249,252,.9);backdrop-filter:blur(16px)}
  .menu-button{display:block}
  .nav-links{position:fixed;inset:var(--head) 0 auto;flex-direction:column;align-items:stretch;gap:2px;padding:14px var(--pad) 22px;background:rgba(255,255,255,.97);box-shadow:0 20px 40px rgba(16,30,60,.1);opacity:0;visibility:hidden;transform:translateY(-12px);transition:opacity .3s,transform .4s var(--ease),visibility .3s}
  .nav-links.open{opacity:1;visibility:visible;transform:none}
  .nav-links a{padding:12px 4px;font-size:15px}
  .nav-cta{justify-content:center;margin-top:8px}
  .hero-grid,.timeline{grid-template-columns:1fr}
  .skill-stack{grid-template-columns:repeat(2,minmax(0,1fr))}
  .lead-row{grid-template-columns:1fr}
  .mini-row.cols{grid-template-columns:repeat(2,1fr)}
  .hero-visual{margin:0 auto;max-height:none;max-width:340px}
  .proof-strip{grid-template-columns:repeat(2,1fr)}
  .section-head{flex-direction:column;align-items:flex-start;gap:10px}
  .section-note{text-align:left;padding-bottom:0}
  .filter-bar{justify-content:flex-start}
  .timeline{padding-top:0}
  .timeline-rail,.timeline-item .node{display:none}
  .timeline-item ul{display:block}
  .cert-list{grid-template-columns:1fr}
}
@media (max-width:520px){
  .skill-stack{grid-template-columns:1fr}
  .brand-text small{display:none}
  .proof-strip{grid-template-columns:1fr}
}


/* ============================================================
   저사양 자동 모드 — 스크롤 프레임이 계속 느리면 JS가 html.lite 를 붙인다
   ============================================================ */
html.lite .backdrop{display:none}
html.lite .site-header.scrolled{background:rgba(247,249,252,.97);backdrop-filter:none}
html.lite .proof-strip{backdrop-filter:none;background:#fff}
html.lite .orbit,html.lite .status-dot,html.lite .scroll-cue i{animation:none}
html.lite .page{perspective:none}
html.lite .page-inner{transform:none;opacity:calc(1 - var(--a,0) * 1.6)}
html.lite .reveal{transition-duration:.3s}
html.lite .line>i{transition-duration:.35s}
html.lite .project-card::before{display:none}
html.lite .pmodal-scrim{backdrop-filter:none;background:rgba(14,20,27,.55)}
html.lite .b-open-text{animation:none}
html.lite .si-bar s{transition-duration:.3s}
html.lite [data-tilt]{transition-duration:.25s}
html.lite.js .project-groups [data-project]{transition-duration:.3s}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;scroll-snap-type:none}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  .js .reveal,.js .line>i,.js .page-inner{opacity:1!important;transform:none!important}
}