/* ========================================
   星屿科技 · 基础样式
   重置 + 字体 + 浅色背景
   ======================================== */

/* ── Reset ── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: auto; /* Lenis 接管滚动 */
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

html.lenis, html.lenis body {
  height: auto;
}

.lenis.lenis-smooth {
  scroll-behavior: auto !important;
}

.lenis.lenis-smooth [data-lenis-prevent] {
  overscroll-behavior: contain;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--font-regular);
  line-height: var(--leading-normal);
  color: var(--color-text-secondary);
  background: var(--color-bg);
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 无障碍：减少动效 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ── 基础排版 ── */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-primary);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
}

h1 { font-size: var(--text-7xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

p {
  line-height: var(--leading-relaxed);
  max-width: 75ch;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

a:hover {
  color: var(--color-accent-deep);
}

.font-mono {
  font-family: var(--font-mono);
}

/* ── 工具类 ── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.container-narrow {
  max-width: var(--container-narrow);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip to main content (无障碍) */
.skip-link {
  position: fixed;
  top: -100%;
  left: var(--space-4);
  z-index: var(--z-loading);
  padding: var(--space-2) var(--space-4);
  background: var(--color-accent);
  color: var(--color-text-inverse);
  border-radius: var(--radius-sm);
  font-weight: var(--font-semibold);
  transition: top var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
  top: var(--space-4);
}

/* ── 图片 ── */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ── 按钮 ── */
button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
}

/* ── 选区 ── */
::selection {
  background: rgba(14, 165, 233, 0.2);
  color: var(--color-text-primary);
}

/* ── 焦点样式（WCAG 2.4.7） ── */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.15);
}

.nav-links a:focus-visible {
  outline-offset: 4px;
  border-radius: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}