:root {
  /* 教育娱乐调性：统一暖背景 + 清晰层次 */
  --bg: #fff0e6; /* 统一背景色（浅桃） */
  --fg: #201a2d;
  --muted: #6b5e7a;
  --brand: #ff6ea7; /* 樱桃粉 */
  --brand-2: #39c7bd; /* 薄荷青（更饱和） */
  --brand-3: #ffcf57; /* 奶油黄（偏金） */
  --surface: rgba(255,255,255,0.72);
  --card-bg: rgba(255,255,255,0.95);
  --card-fg: #201a2d;
  /* Header tones derived from page bg */
  --header-bg: rgba(255, 240, 230, 0.65);     /* slightly stronger for contrast */
  --header-bg-strong: rgba(255, 240, 230, 0.85);
  --header-border: rgba(255, 190, 150, 0.35);
}
/* Force theme overrides via data-theme attribute */
:root[data-theme="light"] {
  --bg: #fff0e6;
  --fg: #201a2d;
  --muted: #6b5e7a;
  --brand: #ff6ea7;
  --brand-2: #39c7bd;
  --brand-3: #ffcf57;
  --surface: rgba(255,255,255,0.72);
  --card-bg: rgba(255,255,255,0.95);
  --card-fg: #201a2d;
  --header-bg: rgba(255, 240, 230, 0.55);
  --header-bg-strong: rgba(255, 240, 230, 0.85);
  --header-border: rgba(255, 190, 150, 0.35);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121017; /* 统一深背景 */
    --fg: #f3eef8;
    --muted: #b6adc8;
    --brand: #ff7fb6;
    --brand-2: #44d8cd;
    --brand-3: #ffd874;
    --surface: rgba(20,18,26,0.55);
    --card-bg: rgba(26,24,32,0.9);
    --card-fg: #f3eef8;
    --header-bg: rgba(18, 16, 23, 0.55);
    --header-bg-strong: rgba(18, 16, 23, 0.85);
    --header-border: rgba(255,255,255,0.08);
  }
}
:root[data-theme="dark"] {
  --bg: #121017;
  --fg: #f3eef8;
  --muted: #b6adc8;
  --brand: #ff7fb6;
  --brand-2: #44d8cd;
  --brand-3: #ffd874;
  --surface: rgba(20,18,26,0.55);
  --card-bg: rgba(26,24,32,0.9);
  --card-fg: #f3eef8;
  --header-bg: rgba(18, 16, 23, 0.55);
  --header-bg-strong: rgba(18, 16, 23, 0.85);
  --header-border: rgba(255,255,255,0.08);
}

/* Webfont: Alimama FangYuanTi Variable (TTF). For best performance, consider WOFF2. */
@font-face {
  font-family: "Alimama FangYuanTi VF";
  src: url("./assets/AlimamaFangYuanTiVF-Thin-2.ttf") format("truetype-variations"),
       url("./assets/AlimamaFangYuanTiVF-Thin-2.ttf") format("truetype");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font: 16px/1.6 "Alimama FangYuanTi VF", "Source Han Rounded SC", "Source Han Rounded", "思源柔黑", "SF Pro Rounded", "Avenir Next Rounded", Nunito, Quicksand, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color: var(--fg);
  background: var(--bg);
}
/* 减少移动端边界回弹导致的抖动 */
html, body { overscroll-behavior-y: contain; }

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 10;
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  background: var(--header-bg);
  border-bottom: 1px solid var(--header-border);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
  transition: background-color .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.site-header.scrolled {
  background: var(--header-bg-strong);
  box-shadow: 0 10px 30px rgba(0,0,0,0.12);
  border-bottom-color: rgba(0,0,0,0.08);
}
.nav {
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 10px 16px;
}
.nav a {
  text-decoration: none;
  opacity: .92;
  border-radius: 12px;
  padding: 6px 10px;
  transition: opacity .25s ease, transform .05s ease;
  background: linear-gradient(120deg, var(--brand), var(--brand-2), var(--brand-3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.nav a:not(.brand):hover { opacity: 1; }
.nav a:not(.brand):active { transform: translateY(1px) scale(0.98); }
.nav .brand {
  font-weight: 800;
  background: linear-gradient(120deg, var(--brand), var(--brand-2), var(--brand-3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: 0.02em;
  background-size: 200% 200%;
  animation: brand-shift 8s ease-in-out infinite alternate;
}

@keyframes brand-shift {
  0% { background-position: 0% 50%; }
  50% { background-position: 50% 50%; }
  100% { background-position: 100% 50%; }
}
.nav .spacer { flex: 1; }

/* Hamburger menu */
.menu-btn { display: none; background: transparent; border: none; font-size: 22px; line-height: 1; padding: 6px 8px; cursor: pointer; color: var(--fg); }
.lang-btn {
  display: inline-block; background: transparent; border: none; font-size: 14px; padding: 6px 8px; cursor: pointer; border-radius: 8px;
  opacity: .92; transition: opacity .25s ease, transform .05s ease;
  background: linear-gradient(120deg, var(--brand), var(--brand-2), var(--brand-3));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lang-btn:hover { opacity: 1; }
.lang-btn:active { transform: translateY(1px) scale(0.98); }

/* Improve nav text contrast in light theme (manual or system) */
:root[data-theme="light"] .nav a,
:root[data-theme="light"] .lang-btn,
:root[data-theme="light"] .theme-btn { text-shadow: 0 0 1px rgba(32,26,45,0.35); }
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) .nav a,
  :root:not([data-theme]) .lang-btn,
  :root:not([data-theme]) .theme-btn { text-shadow: 0 0 1px rgba(32,26,45,0.35); }
}
.theme-btn {
  display: inline-block; background: transparent; border: none; font-size: 14px; padding: 6px 8px; cursor: pointer; border-radius: 8px;
  opacity: .92; transition: opacity .25s ease, transform .05s ease;
  background: linear-gradient(120deg, var(--brand), var(--brand-2), var(--brand-3));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.theme-btn:hover { opacity: 1; }
.theme-btn:active { transform: translateY(1px) scale(0.98); }
.nav-links { display: flex; gap: 10px; }
@media (max-width: 900px) {
  .menu-btn { display: inline-block; }
  .nav .brand { margin-left: 6px; }
  .nav-links { position: absolute; top: 56px; left: 10px; right: 10px; display: none; flex-direction: column; gap: 8px; background: rgba(255,255,255,0.94); backdrop-filter: blur(10px); border-radius: 12px; padding: 10px; box-shadow: 0 14px 28px rgba(0,0,0,0.16); align-items: stretch; }
  :root[data-theme="dark"] .nav-links { background: rgba(18,16,23,0.9); box-shadow: 0 14px 28px rgba(0,0,0,0.35); }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme]) .nav-links { background: rgba(18,16,23,0.9); box-shadow: 0 14px 28px rgba(0,0,0,0.35); }
  }
  .nav-links.open { display: flex; }
  /* 让下拉菜单中的语言/主题按钮与链接在左侧对齐并占满宽度 */
  .nav-links a,
  .nav-links button { display: block; width: 100%; text-align: left; padding: 10px 12px; border-radius: 10px; }
  /* 覆盖桌面端的渐变文字，移动端菜单统一为实色文字 */
  .nav-links a,
  .nav-links button,
  .nav-links a:hover,
  .nav-links button:hover { background: none; -webkit-background-clip: initial; background-clip: initial; color: var(--fg); }
  /* 悬停与激活态的背景反馈（浅色/深色分别处理） */
  .nav-links a:hover,
  .nav-links button:hover { background-color: rgba(0,0,0,0.06); }
  :root[data-theme="dark"] .nav-links a:hover,
  :root[data-theme="dark"] .nav-links button:hover { background-color: rgba(255,255,255,0.08); }
  .nav-links a:active,
  .nav-links button:active { transform: translateY(1px); }
}

/* 移除针对短视口的固定 padding，间距改由脚本按高度动态计算并施加在场景容器上 */

/* 保留 sticky 以呈现动画；小屏滚动稳定性由 svh 与短高策略保证 */

.scene { position: relative; height: 140vh; }
.scene.products { height: 140vh; } /* 缩短停留时间，减轻“卡住”感 */
.scene.vision { height: 140vh; } /* 缩短第三屏高度，减少空白 */
.scene.contact { height: 140vh; } /* 联系页高度更紧凑，减少与 About 的间距 */
.scene .pin {
  position: sticky; top: 0; height: 100vh;
  display: grid; place-items: center;
  padding: clamp(56px, 10vh, 80px) 24px 24px;
  overflow: hidden;
}

/* 使用小视口单位(svh)避免移动端地址栏显隐导致的高度跳变；无支持时回退到固定 innerHeight 变量 */
:root { --vh-fixed: 1vh; }
@supports (height: 100svh) {
  .scene { height: 140svh; }
  .scene.products { height: 110svh; }
  .scene.vision { height: 110svh; }
  .scene.contact { height: 110svh; }
  .scene .pin { height: 100svh; }
  .scene .pin { padding: clamp(56px, 10svh, 80px) 24px 24px; }
}
@supports not (height: 100svh) {
  .scene { height: calc(var(--vh-fixed) * 140); }
  .scene.products { height: calc(var(--vh-fixed) * 110); }
  .scene.vision { height: calc(var(--vh-fixed) * 110); }
  .scene.contact { height: calc(var(--vh-fixed) * 110); }
  .scene .pin { height: calc(var(--vh-fixed) * 100); }
  .scene .pin { padding: clamp(56px, calc(var(--vh-fixed) * 10), 80px) 24px 24px; }
}
/* 分屏叠放顺序：保证后续屏不被上一屏背景遮挡 */
.scene { z-index: 0; }
.scene.products { z-index: 2; }
.scene.vision { z-index: 3; }
/* 顶部对齐且不裁切 */
.scene.products .pin { align-items: start; overflow: visible; }
.scene.contact .pin { align-items: start; overflow: visible; }
.scene .bg {
  position: absolute;
  inset: 0;
  /* 统一背景：不再在各场景切换，避免跳变 */
  background: transparent;
  will-change: transform;
  z-index: 0;
}
.scene .overlay {
  position: absolute; inset: 0;
  /* 统一背景色，无叠加渐变，避免切换感 */
  background: transparent;
  pointer-events: none;
  z-index: 0;
}
.scene .content {
  position: relative; z-index: 1;
  max-width: 1000px;
  text-align: center;
}
.scene .content.narrow { max-width: 720px; }
.scene.vision .pin { align-items: start; } /* 顶对齐减少上下空白 */

h1 { font-size: clamp(32px, 6vw, 68px); line-height: 1.1; margin: 0 0 12px; }
h2 { font-size: clamp(24px, 4.5vw, 42px); line-height: 1.2; margin: 0 0 8px; }
p { margin: 0 auto; color: var(--muted); max-width: 720px; }

/* Prefer rounded brand font for headings; fallback to existing stack */
h1, h2 {
  font-family: "Alimama FangYuanTi VF", "Source Han Rounded SC", "Source Han Rounded", "思源柔黑", "SF Pro Rounded", "Avenir Next Rounded", Nunito, Quicksand, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-weight: 700;
}

/* 首屏文案：微调垂直位置至更居中 */
.hero .content { margin-top: -4vh; }
.hero .content h1 { margin-bottom: 18px; }

/* 联系页内容轻微上移，拉近与上一屏距离 */
.contact .content { margin-top: -2vh; }

/* 首屏与后续屏的文字在滚动时有缩放/字距变化的基础设置 */
.hero .content h1, .hero .content p,
.products .content h2, .products .content p,
.vision .content h2, .vision .content p { transform-origin: center; will-change: transform, letter-spacing; }

.actions { display: flex; gap: 12px; justify-content: center; margin-top: 18px; }
.btn {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 16px;
  color: #1e1a23;
  background: var(--brand-3);
  text-decoration: none;
  font-weight: 600;
  box-shadow: 0 6px 18px rgba(0,0,0,0.08);
}
.btn, button, .lang-btn, .theme-btn, .menu-btn { font-family: inherit; }
.btn.ghost { color: #fff; background: linear-gradient(90deg, var(--brand), var(--brand-2)); border: none; }

.site-footer { text-align: center; padding: 40px 16px; color: var(--muted); }

/* Reduced motion: 关闭复杂转场，仅保留淡入 */
@media (prefers-reduced-motion: reduce) {
  .scene .bg, .scene .overlay { position: absolute; inset: 0; }
}

/* 趣味装饰元素（全局光球） */
.decor { position: absolute; border-radius: 999px; filter: blur(24px); opacity: .5; z-index: 1; }
.global-decor { position: fixed; inset: 0; pointer-events: none; z-index: 1; }
.gball { position: absolute; width: 200px; height: 200px; border-radius: 50%; filter: blur(20px) saturate(120%); opacity: 0; will-change: transform; mix-blend-mode: screen; }
.gball.g1 { background: radial-gradient(circle at 30% 30%, var(--brand), rgba(255,105,180,0.4), transparent 70%); }
.gball.g2 { background: radial-gradient(circle at 60% 40%, var(--brand-2), rgba(90,209,201,0.4), transparent 70%); }
.gball.g3 { background: radial-gradient(circle at 50% 50%, var(--brand-3), rgba(255,207,87,0.35), transparent 70%); }
/* 去除按场景切换背景，保持全站一致 */

/* 产品网格 */
.scene.products .content { max-width: 1100px; }
.scene.products .content h2,
.scene.products .content p {
  opacity: 0;
  transform: translateY(60px);
  letter-spacing: 0.3em;
  will-change: transform, opacity, letter-spacing;
}
.scene.vision .content h2,
.scene.vision .content p {
  opacity: 0;
  transform: translateY(60px);
  letter-spacing: 0.3em;
  will-change: transform, opacity, letter-spacing;
}
.product-grid {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 20px;
}
.card {
  background: var(--card-bg);
  border-radius: 20px;
  padding: 16px;
  text-align: left;
  box-shadow: 0 10px 24px rgba(0,0,0,0.08);
  transform: translateY(40px) scale(0.98);
  opacity: 0; /* 入场时淡入，由动画控制 */
  transition: transform .6s ease, opacity .6s ease, box-shadow .3s ease;
  cursor: pointer;
  display: grid;
  grid-template-columns: 128px 1fr;
  align-items: center;
}
.card h3, .card .desc { color: var(--card-fg); }
.card .icon { display: block; margin: 0 auto; border-radius: 22%; box-shadow: 0 6px 14px rgba(0,0,0,.12); }
.card .meta { padding: 0 8px 0 16px; }
.card h3 { margin: 2px 0 6px; font-size: 20px; font-weight: 800; }
.card .tag { margin: 0 0 10px; color: var(--muted); font-size: 14px; }
.card .desc { margin: 0; opacity: .95; font-size: 14px; line-height: 1.6; }

@media (prefers-color-scheme: dark) {
  .card { box-shadow: 0 8px 18px rgba(0,0,0,0.35); border: 1px solid rgba(255,255,255,0.06); }
}
.card:hover {
  transform: translateY(-6px) scale(1.03) !important;
  box-shadow: 0 14px 32px rgba(0,0,0,0.12);
}
.badges { display: flex; gap: 8px; justify-content: center; }
.store-badge {
  display: inline-block; padding: 8px 10px; border-radius: 12px; font-weight: 700; text-decoration: none;
  box-shadow: 0 4px 10px rgba(0,0,0,0.08);
}
.store-badge.ios { background: var(--brand-2); color: #103c3a; }
.store-badge.gp { background: var(--brand); color: #4c0f26; }

/* 小屏也尽量两列显示 */
@media (max-width: 520px) {
  .card { grid-template-columns: 1fr; text-align: center; }
  .card .meta { padding: 10px 0 0; }
}

@media (prefers-reduced-motion: reduce) {
  .scene.products .content h2,
  .scene.products .content p,
  .scene.vision .content h2,
  .scene.vision .content p,
  .scene.products .card {
    opacity: 1 !important;
    transform: none !important;
    letter-spacing: normal !important;
  }
}

.store-badges { display: flex; gap: 12px; justify-content: center; align-items: center; margin-bottom: 10px; }
/* 统一徽章视觉高度，保持宽高比 */
.store-badges img { display: block; height: 44px; width: auto; }

/* Contact email form */
.contact-cta { display: none; }
.btn.ghost { color: #fff; background: linear-gradient(90deg, var(--brand), var(--brand-2)); border: none; }
.copy-hint { display: block; text-align: center; margin-top: 8px; color: var(--muted); }

/* Inline email inputs */
.email-form { display: grid; gap: 10px; margin: 16px auto 0; max-width: 640px; width: min(600px, calc(100vw - 60px)); }
.email-form label { font-size: 14px; color: var(--muted); }
.email-form input, .email-form textarea {
  width: 100%;
  max-width: 100%;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(0,0,0,0.08);
  background: var(--card-bg);
  color: var(--card-fg);
  font: inherit;
  box-sizing: border-box;
}
.email-form button { justify-self: start; padding: 10px 14px; border-radius: 14px; border: none; cursor: pointer; font-weight: 700; color: #1e1a23; background: var(--brand-3); box-shadow: 0 6px 18px rgba(0,0,0,0.08); }
.email-actions { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.email-actions .btn { min-width: 120px; }

/* Breadcrumb (only on narrow screens) */
.crumb { display: none; }
@media (max-width: 900px) {
  .crumb { display: block; margin: 0 0 12px; }
  .crumb a { color: var(--muted); text-decoration: none; }
  .crumb a:hover { text-decoration: underline; }
}

/* Editor overlay — removed */