/* ===== 硬笔书法大通关 · 落地页样式 ===== */

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

:root {
  --paper: #f6f1e4;
  --card: #fffdf7;
  --ink: #2b2b2b;
  --ink-light: #6b6b6b;
  --seal: #b03a2e;
  --seal-dark: #922b21;
}

html,
body {
  height: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 26px;
  padding: 40px 20px;
  font-family: "Noto Serif SC", "STSong", "SimSun", serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 20% 20%, rgba(176, 58, 46, 0.05), transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(43, 43, 43, 0.05), transparent 45%),
    var(--paper);
}

/* ---- 卡片 ---- */
.card {
  position: relative;
  width: 100%;
  max-width: 560px;
  padding: 48px 40px;
  text-align: center;
  background: var(--card);
  border: 1px solid rgba(43, 43, 43, 0.08);
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(43, 43, 43, 0.08);
}

/* ---- 右上角印章装饰 ---- */
.seal {
  position: absolute;
  top: -18px;
  right: 28px;
  width: 44px;
  height: 44px;
  line-height: 44px;
  font-size: 22px;
  color: #fff;
  background: var(--seal);
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(176, 58, 46, 0.4);
  user-select: none;
}

.kicker {
  margin-bottom: 14px;
  font-size: 13px;
  letter-spacing: 6px;
  color: var(--seal);
}

.title {
  margin-bottom: 16px;
  font-size: 28px;
  font-weight: 700;
  line-height: 1.5;
}

.desc {
  margin-bottom: 32px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-light);
}

/* ---- 跳转按钮 ---- */
.btn {
  display: inline-block;
  padding: 14px 44px;
  font-size: 17px;
  font-family: inherit;
  color: #fff;
  text-decoration: none;
  background: linear-gradient(135deg, #c0453a, var(--seal));
  border-radius: 999px;
  box-shadow: 0 6px 16px rgba(176, 58, 46, 0.35);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 22px rgba(176, 58, 46, 0.45);
}

.btn:active {
  transform: translateY(0);
  box-shadow: 0 4px 10px rgba(176, 58, 46, 0.35);
}

.btn.is-clicked {
  background: var(--seal-dark);
}

.hint {
  margin-top: 18px;
  font-size: 12px;
  color: #a09a8c;
}

/* ---- 页脚 ---- */
.footer {
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--ink-light);
}

/* ---- 移动端适配 ---- */
@media (max-width: 480px) {
  .card {
    padding: 36px 22px;
  }

  .title {
    font-size: 22px;
  }

  .btn {
    padding: 13px 34px;
    font-size: 16px;
  }
}