/**
 * Base Styles — 基础重置与全局样式
 */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-serif);
  font-size: var(--fs-body);
  color: var(--color-text);
  background-color: var(--color-paper);
  line-height: 1.8;
  overflow-x: hidden;
}

/* ── Selection ── */
::selection {
  background: var(--color-accent-light);
  color: var(--color-ink);
}

/* ── Images ── */
img, canvas {
  display: block;
  max-width: 100%;
}

/* ── Links ── */
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--duration-fast) ease;
}

a:hover {
  color: var(--color-gold);
}

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

/* ── Focus visible (keyboard accessibility) ── */
button:focus-visible,
a:focus-visible,
[tabindex="0"]:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ── Code ── */
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: rgba(0, 0, 0, 0.05);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

/* ── Section base ── */
.section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl) var(--space-md);
}

.section + .section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0.3;
}

.section__inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
}

.section__heading {
  font-family: var(--font-serif);
  font-size: var(--fs-h2);
  font-weight: 700;
  color: var(--color-ink);
  text-align: center;
  margin-bottom: var(--space-xs);
  letter-spacing: 0.05em;
}

.heading-deco {
  display: block;
  font-size: 0.45em;
  color: var(--color-accent);
  font-weight: 400;
  letter-spacing: 0.2em;
  margin-bottom: var(--space-xs);
}

.section__desc {
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--fs-body);
  margin-bottom: var(--space-lg);
}

/* ── Loading Screen ── */
.loading-screen {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--color-paper);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  transition: opacity 0.8s var(--ease-out-expo), visibility 0.8s;
}

.loading-screen.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading-brush {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.loading-char {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--color-ink);
  animation: loading-pulse 1.5s ease-in-out infinite;
}

.loading-text {
  font-size: var(--fs-small);
  color: var(--color-text-muted);
  letter-spacing: 0.15em;
}

/* ── Reveal utility ── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}