/* Miri Learning — 官网样式
   与 app 一致的自闭症友好设计原则：
   - 低饱和、低对比柔和配色（避免感官过载）
   - 圆润造型、留白充足、布局可预期
   - 无闪烁、无自动播放；动效缓慢且尊重 prefers-reduced-motion */

:root {
  --sky-top: #dceefb;        /* 浅天蓝（同启动页天空） */
  --cream: #fff7e8;          /* 暖奶油 */
  --hill-back: #cde7b0;      /* 远山浅绿 */
  --hill-front: #b5dc9c;     /* 近山草绿 */
  --sun-yellow: #ffd98e;     /* 吉祥物暖黄 */
  --belly: #ffebc1;          /* 肚皮浅黄 */
  --ink: #7a5c48;            /* 柔和深棕（代替纯黑） */
  --ink-soft: #6b87a3;       /* 蓝灰正文 */
  --ink-light: #8599b3;
  --leaf: #8fbf71;           /* 嫩芽绿 */
  --pink: #f5b8c9;
  --teal: #57b0a2;
  --orange: #eda95e;
  --purple: #9b8cd0;
  --rose: #e58e8e;
  --card: #ffffff;
  --radius: 28px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  font-family: "Nunito", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink-soft);
  background: linear-gradient(180deg, var(--sky-top) 0%, var(--cream) 100%);
  background-attachment: fixed;
  line-height: 1.7;
  font-size: 17px;
}

h1, h2, h3 { color: var(--ink); line-height: 1.3; }

a { color: var(--teal); }

.container { max-width: 1060px; margin: 0 auto; padding: 0 24px; }

/* —— 顶部导航 —— */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255, 251, 240, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(122, 92, 72, 0.08);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 0;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; font-size: 26px; font-weight: 800;
}
.brand svg { display: block; }
.brand .m1 { color: var(--rose); }
.brand .m2 { color: var(--teal); }
.brand .m3 { color: var(--orange); }
.brand .m4 { color: var(--purple); }
.nav-links { display: flex; gap: 8px; flex-wrap: wrap; }
.nav-links a {
  text-decoration: none; color: var(--ink-soft); font-weight: 700;
  padding: 8px 16px; border-radius: 999px;
  transition: background-color 0.25s ease;
}
.nav-links a:hover, .nav-links a:focus-visible { background: rgba(143, 191, 113, 0.18); }
.nav-links a.active { background: rgba(143, 191, 113, 0.28); color: var(--ink); }
.nav-links a:focus-visible { outline: 3px solid var(--teal); outline-offset: 2px; }

/* —— Hero —— */
.hero { padding: 72px 0 40px; text-align: center; }
.hero .mascot { margin: 0 auto 18px; width: 220px; max-width: 60vw; }
.hero h1 { font-size: clamp(34px, 6vw, 56px); margin: 8px 0 12px; }
.hero .tagline { font-size: clamp(18px, 3vw, 24px); color: var(--ink-soft); margin: 0 0 6px; }
.hero .subline { font-size: 16px; color: var(--ink-light); margin: 0 0 32px; }

.btn-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; text-decoration: none; font-weight: 800; font-size: 17px;
  padding: 14px 32px; border-radius: 999px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.btn:focus-visible { outline: 3px solid var(--ink); outline-offset: 3px; }
.btn-primary {
  background: var(--sun-yellow); color: var(--ink);
  box-shadow: 0 6px 18px rgba(237, 169, 94, 0.35);
}
.btn-secondary {
  background: var(--card); color: var(--ink-soft);
  border: 2px solid rgba(107, 135, 163, 0.25);
}
.btn:hover { transform: translateY(-2px); }

/* —— 分区 —— */
.section { padding: 56px 0; }
.section-title { text-align: center; font-size: clamp(26px, 4vw, 36px); margin: 0 0 10px; }
.section-lead { text-align: center; max-width: 640px; margin: 0 auto 40px; color: var(--ink-soft); }

.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 22px; }
.card {
  background: var(--card); border-radius: var(--radius);
  padding: 30px 26px;
  box-shadow: 0 4px 20px rgba(122, 92, 72, 0.07);
  border-top: 6px solid var(--accent, var(--leaf));
}
.card .icon {
  width: 58px; height: 58px; border-radius: 18px;
  display: flex; align-items: center; justify-content: center;
  font-size: 30px; margin-bottom: 14px;
  background: color-mix(in srgb, var(--accent, var(--leaf)) 18%, white);
}
.card h3 { margin: 0 0 8px; font-size: 20px; }
.card p { margin: 0; font-size: 15.5px; }

/* —— 设计原则条 —— */
.principles { background: rgba(255, 255, 255, 0.6); border-radius: var(--radius); padding: 40px 32px; }
.principle-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 26px; margin-top: 26px; }
.principle { display: flex; gap: 14px; align-items: flex-start; }
.principle .dot {
  flex: none; width: 44px; height: 44px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center; font-size: 22px;
  background: var(--dot, var(--hill-back));
}
.principle h3 { margin: 0 0 4px; font-size: 17px; }
.principle p { margin: 0; font-size: 14.5px; }

/* —— 长文页面 —— */
.prose { max-width: 760px; margin: 0 auto; background: rgba(255,255,255,0.75); border-radius: var(--radius); padding: 44px 40px; }
.prose h1 { font-size: clamp(28px, 5vw, 38px); margin-top: 0; }
.prose h2 { font-size: 22px; margin-top: 36px; }
.prose ul { padding-left: 22px; }
.prose li { margin: 6px 0; }

/* —— 页脚 —— */
.site-footer {
  margin-top: 40px; padding: 36px 0 44px;
  background: var(--hill-front);
  border-radius: 48px 48px 0 0;
  color: #4c6b3c; text-align: center;
}
.site-footer a { color: #3e5c30; font-weight: 700; }
.site-footer .footer-links { display: flex; gap: 22px; justify-content: center; flex-wrap: wrap; margin-bottom: 12px; }
.site-footer p { margin: 4px 0; font-size: 14.5px; }

/* —— 温和的入场动效（尊重 reduced-motion，见顶部媒体查询）—— */
@keyframes gentle-rise {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero .mascot, .hero h1, .hero .tagline, .hero .subline, .hero .btn-row {
  animation: gentle-rise 0.9s ease-out both;
}
.hero h1 { animation-delay: 0.15s; }
.hero .tagline { animation-delay: 0.3s; }
.hero .subline { animation-delay: 0.4s; }
.hero .btn-row { animation-delay: 0.55s; }

@media (max-width: 640px) {
  .nav { flex-direction: column; gap: 10px; }
  .prose { padding: 32px 22px; }
}