*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --paper: #faf7ef;
  --paper-dark: #f2edde;
  --ink: #20222e;
  --ink-light: #565a6b;
  --ink-faint: #9095a5;
  --indigo: #3a5fa8;
  --indigo-deep: #2b4880;
  --vermilion: #d94f3d;
  --gold: #d9a441;
  --term-bg: #14161f;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans TC', sans-serif;
  -webkit-font-smoothing: antialiased;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.8;
}
::selection { background: var(--gold); color: var(--ink); }
a { color: var(--indigo); text-underline-offset: 3px; }

/* ===== 頂列 ===== */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 18px;
  padding: 12px 24px;
  background: rgba(250, 247, 239, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(32, 34, 46, .1);
  font-family: 'Fira Code', monospace;
  font-size: 12px;
}
.topbar a { color: var(--ink-light); text-decoration: none; }
.topbar a:hover { color: var(--indigo); }
.topbar .brand { font-weight: 700; color: var(--ink); }
.topbar .spacer { flex: 1; }

/* ===== 版面 ===== */
.wrap { max-width: 760px; margin: 0 auto; padding: 0 24px 100px; }

.hero { padding: 72px 0 40px; text-align: center; }
.hero .kicker {
  font-family: 'Fira Code', monospace;
  font-size: 12px; letter-spacing: .12em;
  color: var(--ink-faint); margin-bottom: 16px;
}
.hero h1 {
  font-family: 'Noto Serif TC', serif;
  font-weight: 900;
  font-size: clamp(32px, 7vw, 52px);
  line-height: 1.3;
  letter-spacing: -.01em;
}
.hero p { margin-top: 18px; font-size: 16px; color: var(--ink-light); }

/* ===== 一格＝一個概念 ===== */
.card {
  margin-top: 56px;
  padding: 36px 32px 40px;
  background: #fff;
  border: 1px solid rgba(32, 34, 46, .1);
  border-radius: 16px;
}
.card .num {
  font-family: 'Fira Code', monospace;
  font-size: 12px; font-weight: 700;
  letter-spacing: .1em;
  color: var(--indigo);
}
.card h2 {
  font-family: 'Noto Sans TC', sans-serif;
  font-weight: 900;
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1.35;
  margin: 8px 0 6px;
}
.card .say {
  font-size: 17px;
  color: var(--ink-light);
  margin-bottom: 26px;
}
.card svg { width: 100%; height: auto; display: block; }

.punch {
  margin-top: 26px;
  padding: 16px 20px;
  background: var(--paper-dark);
  border-radius: 10px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.75;
}
.punch em {
  font-style: normal;
  color: var(--vermilion);
}

.word {
  margin-top: 14px;
  font-family: 'Fira Code', monospace;
  font-size: 13px;
  color: var(--ink-faint);
}
.word b { color: var(--ink); font-weight: 700; }

/* ===== 結尾 ===== */
.end {
  margin-top: 72px;
  text-align: center;
}
.end h2 {
  font-family: 'Noto Serif TC', serif;
  font-weight: 900;
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1.4;
}
.end .cta {
  display: inline-block;
  margin-top: 28px;
  padding: 14px 28px;
  background: var(--indigo);
  color: #fff;
  border-radius: 10px;
  font-weight: 700;
  font-size: 16px;
  text-decoration: none;
  transition: background .15s;
}
.end .cta:hover { background: var(--indigo-deep); color: #fff; }
.end .sub { margin-top: 14px; font-size: 14px; color: var(--ink-faint); }

@media (max-width: 600px) {
  .card { padding: 28px 20px 32px; border-radius: 12px; }
  .hero { padding: 48px 0 24px; }
}

/* 結尾段落裡的行內 code */
.end code {
  font-family: 'Fira Code', monospace;
  font-size: .92em;
  background: var(--paper-dark);
  padding: 2px 7px;
  border-radius: 5px;
}