/* =========================================================
   디자인 토큰 — 블랙 & 화이트. data-theme 으로 전환.
   (색을 바꾸고 싶으면 여기 변수만 고치면 사이트 전체에 적용됨)
   ========================================================= */
:root{
  --bg:#000000;
  --bg-soft:#0e0e0f;
  --bg-raised:#161617;
  --ink:#f5f5f7;
  --ink-dim:rgba(245,245,247,.62);
  --ink-faint:rgba(245,245,247,.38);
  --line:rgba(255,255,255,.12);
  --line-strong:rgba(255,255,255,.24);
  --invert-bg:#f5f5f7;
  --invert-ink:#000;
  --sans:"Pretendard",system-ui,-apple-system,"SF Pro Display",sans-serif;
  --maxw:1080px;
}
:root[data-theme="light"]{
  --bg:#ffffff;
  --bg-soft:#f5f5f7;
  --bg-raised:#f0f0f2;
  --ink:#1d1d1f;
  --ink-dim:rgba(29,29,31,.62);
  --ink-faint:rgba(29,29,31,.4);
  --line:rgba(0,0,0,.12);
  --line-strong:rgba(0,0,0,.22);
  --invert-bg:#1d1d1f;
  --invert-ink:#fff;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body{
  font-family:var(--sans);
  background:var(--bg);
  color:var(--ink);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  transition:background .4s ease, color .4s ease;
}
a{color:inherit;text-decoration:none}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
section.pad{padding:110px 0}

.eyebrow{
  font-size:13px;letter-spacing:.04em;
  color:var(--ink-faint);margin-bottom:18px;font-weight:500;
}
h2.section-title{
  font-size:clamp(28px,4.5vw,44px);
  font-weight:700;letter-spacing:-.025em;margin-bottom:14px;
}

/* =========================================================
   네비
   ========================================================= */
header.nav{
  position:sticky;top:0;z-index:60;
  background:color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
}
.nav-inner{
  max-width:var(--maxw);margin:0 auto;padding:15px 28px;
  display:flex;align-items:center;justify-content:space-between;
}
.brand{font-weight:700;font-size:17px;letter-spacing:-.01em}
.nav-right{display:flex;align-items:center;gap:26px}
.nav-links{display:flex;gap:24px;font-size:14px;color:var(--ink-dim)}
.nav-links a{transition:color .2s}
.nav-links a:hover,.nav-links a:focus-visible{color:var(--ink)}
@media(max-width:680px){.nav-links{display:none}}
.theme-toggle{
  background:none;border:1px solid var(--line-strong);
  width:34px;height:34px;border-radius:50%;cursor:pointer;
  color:var(--ink);font-size:15px;line-height:1;
  display:grid;place-items:center;transition:.2s;
}
.theme-toggle:hover{background:var(--bg-raised)}

/* =========================================================
   히어로
   ========================================================= */
.hero{padding:140px 0 110px}
.hero h1{
  font-size:clamp(42px,8vw,80px);
  font-weight:700;line-height:1.05;letter-spacing:-.04em;margin-bottom:26px;
}
.hero h1 .dim{color:var(--ink-faint)}
.hero .lede{
  font-size:clamp(18px,2.4vw,22px);color:var(--ink-dim);
  max-width:540px;margin-bottom:38px;letter-spacing:-.01em;
}
.roles{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:42px}
.role{
  font-size:13px;letter-spacing:.01em;color:var(--ink-dim);
  border:1px solid var(--line-strong);border-radius:999px;padding:7px 15px;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:13px}
.btn{
  font-size:15px;font-weight:500;padding:13px 26px;border-radius:999px;
  display:inline-flex;align-items:center;gap:7px;transition:transform .15s,opacity .2s,background .2s,border-color .2s,color .2s;
}
.btn-primary{background:var(--invert-bg);color:var(--invert-ink);font-weight:600}
.btn-primary:hover{transform:translateY(-2px);opacity:.88}
.btn-ghost{border:1px solid var(--line-strong);color:var(--ink)}
.btn-ghost:hover{border-color:var(--ink);transform:translateY(-2px)}

/* =========================================================
   About
   ========================================================= */
.about-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:56px;align-items:start}
@media(max-width:760px){.about-grid{grid-template-columns:1fr;gap:34px}}
.about p{color:var(--ink-dim);font-size:17px;margin-bottom:18px;max-width:54ch}
.about p strong{color:var(--ink);font-weight:600}
.facts{border-left:1px solid var(--line);padding-left:24px}
.fact{margin-bottom:20px}
.fact .k{font-size:12px;letter-spacing:.03em;color:var(--ink-faint);margin-bottom:4px}
.fact .v{font-size:15px;color:var(--ink)}

/* =========================================================
   기술 스택
   ========================================================= */
.stack-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
@media(max-width:760px){.stack-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:440px){.stack-grid{grid-template-columns:1fr}}
.stack-cat{background:var(--bg-soft);border:1px solid var(--line);border-radius:14px;padding:22px}
.stack-cat h3{font-size:14px;color:var(--ink);font-weight:600;margin-bottom:13px}
.stack-cat ul{list-style:none;display:flex;flex-direction:column;gap:8px}
.stack-cat li{font-size:15px;color:var(--ink-dim)}

/* =========================================================
   프로젝트 — 애플 제품 페이지 스타일 풀스크린, 좌우 교차
   배경 이미지: 16:9 가로형으로 통일. cover + center 라서
   어떤 화면 크기에서도 중앙 기준으로 채워짐.
   이미지가 없으면 background-color(검정)가 fallback.
   ========================================================= */
.projects-head{padding:110px 0 10px}
.project{
  position:relative;min-height:88vh;width:100%;
  display:flex;align-items:flex-end;
  background-size:cover;background-position:center;
  background-color:#0a0a0a; /* 이미지 넣기 전/로드 전 fallback */
  overflow:hidden;
}
/* 하단 가독성용 그라데이션 — 모든 프로젝트에 동일 적용 (이미지가 무엇이든 텍스트가 보이게) */
.project::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(to top, rgba(0,0,0,.82) 0%, rgba(0,0,0,.35) 38%, rgba(0,0,0,0) 65%);
}
.project-content{
  position:relative;z-index:2;width:100%;
  max-width:var(--maxw);margin:0 auto;padding:0 28px 64px;
  display:flex;align-items:flex-end;justify-content:space-between;gap:30px;
  color:#fff;
}
.project-content.right{flex-direction:row-reverse;text-align:right}
.project-main{max-width:520px}
.project-content.right .project-main{margin-left:auto}
.p-title{font-size:clamp(38px,6vw,68px);font-weight:700;letter-spacing:-.035em;line-height:1.02;margin-bottom:14px}
.p-desc{font-size:clamp(16px,2vw,20px);color:rgba(255,255,255,.82);line-height:1.5;margin-bottom:12px}
.p-award{
  display:inline-block;font-size:13px;font-weight:600;letter-spacing:.01em;
  color:#fff;border:1px solid rgba(255,255,255,.5);border-radius:999px;padding:5px 13px;
}
/* 기술 나열 (반대편) */
.project-tech{display:flex;flex-direction:column;gap:9px;padding-bottom:6px;min-width:140px}
.project-content.right .project-tech{align-items:flex-start;text-align:left}
.project-content:not(.right) .project-tech{align-items:flex-end;text-align:right}
.project-tech .t-label{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:rgba(255,255,255,.5);margin-bottom:3px}
.project-tech span.t{font-size:15px;color:rgba(255,255,255,.92);font-weight:500}

@media(max-width:680px){
  /* 모바일: 섹션 높이를 낮춰 가로형(16:9) 이미지의 좌우 크롭을 줄이고,
     피사체가 보통 위쪽에 있으므로 살짝 위를 기준으로 보여줌 */
  .project{min-height:72vh;background-position:center 35%}
  .project-content,
  .project-content.right{flex-direction:column;align-items:flex-start;text-align:left;gap:22px;padding-bottom:48px}
  .project-content.right .project-main{margin-left:0}
  .project-content.right .project-tech,
  .project-content:not(.right) .project-tech{align-items:flex-start;text-align:left}
}

/* =========================================================
   수상 · 활동
   ========================================================= */
.activity{display:flex;gap:24px;align-items:baseline;padding:22px 0;border-top:1px solid var(--line)}
.activity:last-child{border-bottom:1px solid var(--line)}
.activity .yr{font-size:14px;color:var(--ink-faint);min-width:80px;font-weight:500}
.activity .desc{font-size:16px;color:var(--ink)}
.activity .desc span{display:block;color:var(--ink-faint);font-size:14px;margin-top:2px}

/* =========================================================
   Contact / 푸터
   ========================================================= */
.contact{text-align:center;padding:120px 0}
.contact h2{font-size:clamp(30px,5vw,50px);font-weight:700;letter-spacing:-.03em;margin-bottom:16px}
.contact p{color:var(--ink-dim);margin-bottom:34px;font-size:17px}
.contact-links{display:flex;justify-content:center;flex-wrap:wrap;gap:13px}
footer{border-top:1px solid var(--line);padding:28px 0;text-align:center}
footer p{font-size:13px;color:var(--ink-faint)}

/* 스크롤 진입 애니메이션 */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}