/* ============================================
   基础层：重置、排版、氛围、焦点与动效降级
   ============================================ */

*,
*::before,
*::after {
  box-sizing: border-box;
}

/* hidden 属性必须生效：作者样式的 display 会覆盖 UA 的 [hidden]{display:none} */
[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.7;
  letter-spacing: 0.02em; /* 中文正文放宽字距 */
  font-variant-numeric: tabular-nums;
  min-height: 100vh;
  overflow-x: hidden;
}

/* —— 氛围层：渐变网格 + 颗粒，替代纯色平铺 —— */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(52rem 34rem at 8% -12%, rgba(240, 130, 30, 0.16), transparent 62%),
    radial-gradient(44rem 30rem at 102% 4%, rgba(232, 180, 74, 0.09), transparent 58%),
    radial-gradient(38rem 30rem at 60% 108%, rgba(196, 112, 58, 0.07), transparent 60%);
}

/* 颗粒噪点 */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.045;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.05;
}

h1 {
  font-size: var(--fs-2xl);
}
h2 {
  font-size: var(--fs-xl);
}
h3 {
  font-size: var(--fs-lg);
}

p {
  margin: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

/* —— 等宽数字：所有金额/比率列 —— */
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
}

/* —— 焦点可见性（可访问性硬要求）—— */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* —— 入场序列：一次编排，错峰揭示 —— */
.reveal {
  opacity: 0;
  transform: translateY(22px);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
  transition:
    opacity var(--dur-base) var(--ease-out),
    transform var(--dur-base) var(--ease-out);
}

.reveal[data-d="1"] {
  transition-delay: 70ms;
}
.reveal[data-d="2"] {
  transition-delay: 140ms;
}
.reveal[data-d="3"] {
  transition-delay: 210ms;
}
.reveal[data-d="4"] {
  transition-delay: 280ms;
}
.reveal[data-d="5"] {
  transition-delay: 350ms;
}

/* —— 动效降级 —— */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* —— 滚动条（贴合主题）—— */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg-raise);
}
::-webkit-scrollbar-thumb {
  background: var(--color-surface-3);
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-neutral);
}

::selection {
  background: var(--color-accent);
  color: #14110f;
}