:root {
  --red: #CD282D;
  --red-deep: #A81C23;
  --gold: #A47A22;
  --cream: #FBF5EC;
  --paper: #FFFFFF;
  --ink: #1E1B1A;
  --ink-soft: #4A4441;
  --line: #E6DAC7;
  --alert-bg: #FBEDEA;
  --alert-line: #E7B9B1;
  --jade: #2D6A57;
  --sans: 'Noto Sans TC', 'PingFang TC', 'Microsoft JhengHei', sans-serif;
  --serif: 'Noto Serif TC', 'Songti TC', serif;
  --brand: 'Fraunces', Georgia, serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--red); text-underline-offset: 3px; }
a:hover { color: var(--red-deep); }
:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; }

.wrap { width: min(1080px, 100% - 40px); margin-inline: auto; }

/* 頁首：紅底，像一張喜帖 */
.hero {
  background: var(--red);
  color: var(--cream);
  padding: 28px 0 96px;
}
.hero a { color: var(--cream); }
.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand svg { width: 44px; height: 44px; }
.brand span { font-family: var(--brand); font-weight: 800; font-size: 26px; letter-spacing: 0.5px; }
.top nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.top nav a { font-size: 15px; }

.hero-body {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  align-items: center;
  gap: 48px;
  margin-top: 72px;
}
.hero h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(40px, 6.4vw, 76px);
  line-height: 1.22;
  letter-spacing: 0.04em;
}
.hero p { margin: 28px 0 0; max-width: 30em; font-size: 19px; opacity: 0.94; }
.hero .launch {
  display: inline-block;
  margin-top: 36px;
  padding: 12px 22px;
  border: 1.5px solid var(--cream);
  border-radius: 999px;
  font-size: 16px;
  text-decoration: none;
}
.hero .launch:hover { background: var(--cream); color: var(--red); }
.seal { justify-self: center; width: min(340px, 80%); }

/* 防詐示範 */
.demo { padding: 96px 0 72px; }
.demo-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; align-items: center; }
h2 { margin: 0; font-family: var(--serif); font-size: clamp(28px, 3.4vw, 40px); line-height: 1.35; }
.demo p { color: var(--ink-soft); max-width: 30em; }

.phone {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 400px;
  justify-self: center;
  width: 100%;
}
.bubble { max-width: 80%; padding: 10px 14px; border-radius: 18px; font-size: 15px; line-height: 1.55; }
.bubble.them { align-self: flex-start; background: var(--cream); border-bottom-left-radius: 6px; }
.bubble.me { align-self: flex-end; background: var(--red); color: var(--paper); border-bottom-right-radius: 6px; }
.alert {
  background: var(--alert-bg);
  border: 1px solid var(--alert-line);
  border-radius: 16px;
  padding: 12px 14px;
  font-size: 14px;
  line-height: 1.6;
}
.alert strong { display: block; color: var(--red-deep); font-size: 15px; margin-bottom: 4px; }
.hidden-note { font-size: 12px; color: var(--ink-soft); padding-left: 6px; }

/* 三個承諾 */
.promises { padding: 24px 0 96px; }
.promises ul { list-style: none; margin: 32px 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 40px; }
.promises li { border-top: 2px solid var(--red); padding-top: 18px; }
.promises h3 { margin: 0 0 6px; font-size: 19px; }
.promises li p { margin: 0; color: var(--ink-soft); font-size: 16px; }

/* 內文頁（隱私政策、刪除帳號） */
.page-head { background: var(--red); color: var(--cream); padding: 28px 0 56px; }
.page-head a { color: var(--cream); }
.page-head h1 { margin: 48px 0 0; font-family: var(--serif); font-size: clamp(32px, 4.4vw, 48px); }
.doc { padding: 56px 0 96px; }
.doc article { max-width: 42em; }
.doc h2 { font-size: 24px; margin-top: 40px; }
.doc li { margin-bottom: 6px; }
.draft {
  background: var(--paper);
  border: 1px dashed var(--gold);
  border-radius: 12px;
  padding: 14px 18px;
  font-size: 15px;
}

footer { border-top: 1px solid var(--line); padding: 28px 0 40px; font-size: 14px; color: var(--ink-soft); }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 28px; justify-content: space-between; }
footer nav { display: flex; flex-wrap: wrap; gap: 20px; }

@media (max-width: 760px) {
  body { font-size: 16px; }
  .hero { padding-bottom: 64px; }
  .hero-body, .demo-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero-body { margin-top: 40px; }
  .seal { width: 180px; justify-self: start; order: -1; }
  .promises ul { grid-template-columns: 1fr; gap: 28px; }
  .demo { padding-top: 64px; }
}