/* Reset */
* { margin: 0; padding: 0; box-sizing: border-box; }

/* Base */
:root{
  --text: #111;
  --muted: #555;
  --line: #e9e9e9;

  /* green accent */
  --g-ink: #2f8f5b;
  --g-border: #9fd6b4;
  --g-bg: #f4fbf7;
}

body{
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue",
    "Segoe UI", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  background:#fff;
  color: var(--text);
  line-height: 1.75;
}

/* Header */
.site-header{
  background:#fff;
  border-bottom: 1px solid var(--line);
}

.header-inner{
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 24px 56px;
}

.topbar{
  display:flex;
  align-items:center;
  justify-content:flex-start;
}

.brand img{
  height: 86px;
  display:block;
}

/* Hero */
.hero{
  display:grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
  margin-top: 48px;
}

.hero-title{
  font-size: 34px;
  font-weight: 650;
  line-height: 1.35;
  letter-spacing: -0.02em;

  /* ????? */
  word-break: keep-all;
  overflow-wrap: normal;
}

.hero-sub{
  margin-top: 18px;
  font-size: 16px;
  color: var(--muted);
  max-width: 40em;
}

.hero-image img{
  width: 100%;
  border-radius: 14px;
  display:block;
}

/* Main layout */
.container{
  max-width: 1040px;
  margin: 0 auto;
  padding: 72px 24px 120px;
}

/* Sections */
.section{
  margin-bottom: 88px;
}

.section-title{
  font-size: 18px;
  font-weight: 650;
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}

.section-lead{
  color: var(--muted);
  font-size: 15px;
  margin-bottom: 26px;
  max-width: 60ch;
}

/* Compare */
.compare{
  display:grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 28px;
  align-items: start;
  margin-top: 10px;
}

.divider{
  width: 1px;
  background: var(--line);
  height: 100%;
}

/* Column head */
.col-head{ margin-bottom: 14px; }
.pill{
  display:inline-block;
  font-size: 12px;
  letter-spacing: .06em;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid #e6e6e6;
  color: #444;
  background:#fafafa;
}
.col-sub{
  margin-top: 10px;
  font-size: 14px;
  color: #222;
}

/* Flow list */
.flow{
  list-style: none;
  display:flex;
  flex-direction: column;
  gap: 12px;
}

.step{
  border: 1px solid #e6e6e6;
  border-radius: 14px;
  padding: 16px 16px;
  background:#fff;
  display:flex;
  flex-direction: column;
  gap: 6px;
}

.step .label{
  font-size: 12px;
  letter-spacing: .08em;
  color: #666;
}

.step .text{
  font-size: 15px;
  color:#1a1a1a;
}

.step.thinking{
  border-color: var(--g-border);
  background: var(--g-bg);
}

.step.thinking .label{
  color: var(--g-ink);
  font-weight: 700;
}

.step.build{
  background:#fcfcfc;
}

.step.result{
  background:#fafafa;
}

/* Prose */
.prose p{
  font-size: 16px;
  color:#222;
  max-width: 70ch;
  margin-bottom: 18px;
}

.prose .closing{
  margin-top: 10px;
  color: #333;
}

/* Footer */
.footer{
  border-top: 1px solid var(--line);
  padding-top: 18px;
  color: #666;
  font-size: 13px;
}

/* Responsive */
@media (max-width: 960px){
  .hero{
    grid-template-columns: 1fr;
  }
  .hero-text h1{
    font-size: 28px;
  }
  .compare{
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .divider{ display:none; }
}

@media (max-width: 600px){
  .header-inner{ padding: 22px 18px 44px; }
  .container{ padding: 56px 18px 96px; }
  .brand img{ height: 30px; }
}