:root {
  --brand-red: #d9081d;
  --brand-red-dark: #b50014;
  --ink: #171717;
  --muted: #686868;
  --surface: #ffffff;
  --surface-soft: #f5f5f5;
  --line: #e9e9e9;
  --header-height: 60px;
  --page-pad: clamp(16px, 5vw, 24px);
  --content-max: 640px;
  --shadow: 0 10px 30px rgb(0 0 0 / 8%);
}

*, *::before, *::after { box-sizing: border-box; }
html { overflow-x: hidden; scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--surface);
  font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.65;
}
body.is-menu-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }
button { color: inherit; }
:focus-visible { outline: 3px solid #ffc400; outline-offset: 3px; }

.page-shell {
  width: min(100%, var(--content-max));
  margin-inline: auto;
  padding-inline: var(--page-pad);
}

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  height: var(--header-height);
  padding: 0 max(var(--page-pad), env(safe-area-inset-right)) 0 max(var(--page-pad), env(safe-area-inset-left));
  background: var(--brand-red);
}
.brand { display: inline-flex; align-items: center; min-width: 80px; min-height: 44px; }
.brand img { width: 68px; height: auto; }
.menu-button {
  display: grid;
  place-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}
.menu-button span { display: block; width: 24px; height: 2px; background: #fff; transition: transform 180ms ease, opacity 180ms ease; }
.is-menu-open .menu-button span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.is-menu-open .menu-button span:nth-child(2) { opacity: 0; }
.is-menu-open .menu-button span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.site-drawer {
  position: fixed;
  z-index: 60;
  inset: 0 0 0 auto;
  width: min(82vw, 320px);
  padding: calc(88px + env(safe-area-inset-top)) 24px 32px;
  visibility: hidden;
  transform: translateX(100%);
  background: #fff;
  box-shadow: -16px 0 40px rgb(0 0 0 / 16%);
  transition: transform 220ms ease, visibility 220ms;
}
.is-menu-open .site-drawer { visibility: visible; transform: translateX(0); }
.site-drawer nav { display: grid; }
.site-drawer a { display: flex; align-items: center; min-height: 58px; border-bottom: 1px solid var(--line); font-size: 17px; font-weight: 600; }
.site-drawer a::after { margin-left: auto; color: var(--brand-red); content: "›"; font-size: 24px; }
.drawer-backdrop {
  position: fixed;
  z-index: 55;
  inset: 0;
  visibility: hidden;
  opacity: 0;
  border: 0;
  background: rgb(0 0 0 / 42%);
  transition: opacity 220ms ease, visibility 220ms;
}
.is-menu-open .drawer-backdrop { visibility: visible; opacity: 1; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 11px 22px;
  border: 1px solid transparent;
  border-radius: 4px;
  background: var(--brand-red);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}
.button:hover { background: var(--brand-red-dark); }
.button--secondary { border-color: var(--line); background: #fff; color: var(--ink); }
.button--block { width: 100%; }

.site-footer {
  padding: 32px var(--page-pad) max(24px, env(safe-area-inset-bottom));
  background: #161616;
  color: #bbb;
  font-size: 12px;
  text-align: center;
}
.site-footer nav { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px 20px; margin-bottom: 18px; color: #fff; font-size: 14px; }
.site-footer p { margin: 0; }

[data-reveal] { opacity: 0; transform: translateY(20px); transition: opacity 520ms ease, transform 520ms ease; transition-delay: var(--delay, 0ms); }
[data-reveal].is-visible { opacity: 1; transform: none; }
.image-load-failed { min-height: 160px; background: var(--surface-soft); color: transparent; }
.toast {
  position: fixed;
  z-index: 80;
  left: 50%;
  bottom: max(88px, calc(72px + env(safe-area-inset-bottom)));
  width: max-content;
  max-width: calc(100vw - 32px);
  padding: 11px 16px;
  transform: translate(-50%, 16px);
  opacity: 0;
  border-radius: 4px;
  background: rgb(20 20 20 / 94%);
  color: #fff;
  font-size: 14px;
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
}
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
  [data-reveal] { opacity: 1; transform: none; }
}