/* ===== TOKENS ===== */
:root {
  --black: #000;
  --white: #fff;
  --gray: #888;
  --gray-dim: #555;
  --gray-line: #222;
  --gray-card: #111;
  --red: #FF3B30;
  --font: system-ui, -apple-system, "PingFang SC", "Noto Sans SC", "Helvetica Neue", sans-serif;
  --mono: "SF Mono", "Menlo", "Courier New", monospace;
  --ease: cubic-bezier(.4,0,.2,1);
}

/* ===== RESET ===== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);background:var(--white);color:var(--black);
  line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
ul,dl{list-style:none}
button{font:inherit;border:none;background:none;cursor:pointer}

/* ===== REVEAL ===== */
[data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
[data-reveal].revealed{opacity:1;transform:none}

/* ===== HEADER ===== */
.hd{
  position:fixed;top:0;left:0;right:0;z-index:100;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 clamp(20px,5vw,60px);height:56px;
  background:rgba(255,255,255,.9);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid #eee;
}
.sec-dark .hd,.hero~.hd{border-color:var(--gray-line)}
.logo{font-size:1rem;font-weight:800;letter-spacing:.05em}
.hd-nav{display:flex;gap:24px;font-size:.82rem;color:var(--gray)}
.hd-nav a{transition:color .2s}
.hd-nav a:hover{color:var(--black)}
.hd-menu{display:none;width:24px;height:24px;position:relative}
.hd-menu span,.hd-menu::before,.hd-menu::after{
  content:'';position:absolute;left:2px;right:2px;height:1.5px;
  background:var(--black);transition:.3s;
}
.hd-menu span{top:11px}.hd-menu::before{top:6px}.hd-menu::after{top:16px}

/* ===== BUTTONS ===== */
.btn{
  display:inline-block;padding:10px 24px;
  font-size:.85rem;font-weight:600;
  background:var(--black);color:var(--white);
  border-radius:4px;transition:opacity .2s;
}
.btn:hover{opacity:.75}
.btn-o{background:transparent;color:var(--black);border:1.5px solid var(--black)}
.sec-dark .btn{background:var(--white);color:var(--black)}
.sec-dark .btn-o{color:var(--white);border-color:var(--white)}
.sec-dark .btn-o:hover{background:var(--white);color:var(--black)}

/* ===== SECTION ===== */
.sec{
  padding:clamp(60px,10vw,120px) clamp(20px,5vw,60px);
  max-width:1200px;margin:0 auto;
}
.sec-dark{
  max-width:100%;
  background:var(--black);color:var(--white);
}
.sec-dark > *{max-width:1200px}
.sec-dark .sec-head,.sec-dark h2,.sec-dark .md-grid,.sec-dark .work-list,
.sec-dark .ct-sub,.sec-dark .ct-grid,.sec-dark .ct-note{
  padding-left:clamp(20px,5vw,60px);padding-right:clamp(20px,5vw,60px);
  max-width:1200px;margin-left:auto;margin-right:auto;
}
.sec-dark h2{max-width:1200px}

.sec-head{
  display:flex;align-items:center;gap:12px;
  margin-bottom:24px;
}
.sec-n{
  font-family:var(--mono);font-size:.7rem;font-weight:700;
  width:28px;height:28px;border-radius:50%;
  border:1.5px solid currentColor;
  display:inline-flex;align-items:center;justify-content:center;
}
.sec-name{
  font-family:var(--mono);font-size:.75rem;
  letter-spacing:.1em;text-transform:uppercase;
  color:var(--gray);
}
.sec-dark .sec-name{color:var(--gray)}

.sec h2{
  font-size:clamp(1.5rem,3.5vw,2.6rem);
  font-weight:800;line-height:1.35;letter-spacing:-.02em;
  margin-bottom:48px;
}

/* ===== HERO ===== */
.hero{
  min-height:100vh;min-height:100dvh;
  display:flex;flex-direction:column;justify-content:center;
  padding:100px clamp(20px,5vw,60px) 0;
  max-width:1200px;margin:0 auto;
  position:relative;
}
.hero-tag{
  font-family:var(--mono);font-size:.75rem;
  color:var(--gray);letter-spacing:.08em;
  margin-bottom:32px;
}
.hero h1{
  font-size:clamp(2.8rem,8vw,6.5rem);
  font-weight:900;line-height:1.05;letter-spacing:-.03em;
  margin-bottom:48px;
}
.hero-bot{
  display:flex;justify-content:space-between;align-items:flex-end;
  gap:40px;padding-bottom:32px;
}
.hero-bot p{
  max-width:440px;font-size:.92rem;color:var(--gray-dim);line-height:1.8;
}
.hero-actions{display:flex;gap:10px;flex-shrink:0}

/* strip */
.hero-strip{
  position:absolute;bottom:0;left:0;right:0;
  overflow:hidden;border-top:1px solid #eee;
  padding:12px 0;
}
.strip-track{
  display:flex;gap:48px;white-space:nowrap;
  animation:slide 16s linear infinite;
  font-family:var(--mono);font-size:.7rem;font-weight:600;
  letter-spacing:.15em;color:#ccc;
}
.strip-track span{flex-shrink:0}
@keyframes slide{to{transform:translateX(-50%)}}

/* ===== ABOUT ===== */
.about-split{
  display:grid;grid-template-columns:1.1fr 1fr;gap:48px;
  align-items:start;
}
.about-r p{font-size:.92rem;color:var(--gray-dim);line-height:1.9}
.about-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.about-tags span{
  padding:6px 16px;border-radius:3px;
  border:1px solid #ddd;font-size:.8rem;color:var(--gray-dim);
  transition:.2s;
}
.about-tags span:hover{border-color:var(--black);color:var(--black)}

/* ===== WORK ===== */
.work-title{margin-bottom:56px!important}
.work-list{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--gray-line)}
.wk{background:var(--black);padding:36px}
.wk-top{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.wk-n{
  font-family:var(--mono);font-size:.72rem;font-weight:700;
  color:var(--red);flex-shrink:0;
}
.wk-line{flex:1;height:1px;background:var(--gray-line)}
.wk h3{font-size:1.1rem;font-weight:700;flex-shrink:0}
.wk p{font-size:.88rem;color:var(--gray);line-height:1.75}

/* ===== HOW ===== */
.how-row{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}
.hw{}
.hw-n{
  font-family:var(--mono);font-size:2.5rem;font-weight:900;
  color:#eee;line-height:1;margin-bottom:16px;
}
.hw h3{font-size:1.05rem;font-weight:700;margin-bottom:8px}
.hw p{font-size:.88rem;color:var(--gray-dim);line-height:1.75}

/* ===== METHOD ===== */
.md-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--gray-line)}
.md{background:var(--black);padding:36px}
.md-label{
  display:inline-block;
  font-size:.72rem;font-weight:700;letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--red);
  margin-bottom:12px;
  padding-bottom:8px;
  border-bottom:2px solid var(--red);
}
.md p{font-size:.88rem;color:var(--gray);line-height:1.75}

/* method light variant */
.md-grid-light{background:#eee}
.md-light{background:var(--white)}
.md-label-light{color:var(--black);border-bottom-color:var(--black)}
.md-light p{color:var(--gray-dim)}

/* ===== SCENES ===== */
.sc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.sc-card{
  padding:32px;border:1px solid #ddd;border-radius:6px;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.sc-card:hover{border-color:var(--black);box-shadow:0 2px 12px rgba(0,0,0,.06)}
.sc-card h3{font-size:1.05rem;font-weight:700;margin-bottom:10px}
.sc-card p{font-size:.88rem;color:var(--gray-dim);line-height:1.75}

/* ===== CONTACT ===== */
.ct-sub{font-size:.92rem;color:var(--gray);margin-top:-32px;margin-bottom:40px}
.ct-grid{
  display:grid;grid-template-columns:repeat(3,1fr);
  gap:1px;background:var(--gray-line);
  margin-bottom:32px;
}
.ct-item{background:var(--black);padding:28px}
.ct-item span{display:block;font-size:.75rem;color:var(--gray);margin-bottom:6px;font-family:var(--mono)}
.ct-item strong{font-size:.95rem;font-weight:600}
.ct-note{font-size:.78rem;color:var(--gray-dim)}

/* ===== FOOTER ===== */
.ft{border-top:1px solid #eee;padding:20px clamp(20px,5vw,60px)}
.ft-in{
  max-width:1200px;margin:0 auto;
  display:flex;justify-content:space-between;
  font-size:.75rem;color:var(--gray);
}

/* ===== RESPONSIVE ===== */
@media(max-width:820px){
  .about-split{grid-template-columns:1fr;gap:24px}
  .work-list{grid-template-columns:1fr}
  .how-row{grid-template-columns:1fr;gap:40px}
  .md-grid{grid-template-columns:1fr}
  .sc-grid{grid-template-columns:1fr}
  .ct-grid{grid-template-columns:1fr}
}
@media(max-width:600px){
  .hd-nav{display:none}
  .hd-nav.open{
    display:flex;flex-direction:column;
    position:absolute;top:100%;left:0;right:0;
    background:rgba(255,255,255,.97);backdrop-filter:blur(10px);
    padding:16px clamp(20px,5vw,60px);gap:12px;
    border-bottom:1px solid #eee;
  }
  .hd-menu{display:block}
  .hero h1{font-size:clamp(2rem,10vw,3.5rem)}
  .hero-bot{flex-direction:column;align-items:flex-start;gap:20px}
}