@import url('https://fonts.googleapis.com/css2?family=Nunito+Sans:wght@300;400;500;600;700&family=Varela+Round&display=swap');

/* ===== 重置与基础 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --c-primary: #ff0080;
  --c-accent: #ff00ff;
  --c-dark: #26171f;
  --c-dark2: #1a0f16;
  --c-dark3: #32202b;
  --c-text: #f5e8f0;
  --c-text-muted: #c9a8bc;
  --c-card-bg: rgba(38, 23, 31, 0.72);
  --c-border: rgba(255, 0, 128, 0.18);
  --nav-w: 240px;
  --radius-card: 28px;
  --radius-sm: 12px;
  --font-body: 'Nunito Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-brand: 'Varela Round', 'Nunito Sans', sans-serif;
  --shadow-card: 0 8px 40px rgba(255, 0, 128, 0.18), 0 2px 12px rgba(0,0,0,0.4);
  --shadow-hover: 0 16px 60px rgba(255, 0, 255, 0.28), 0 4px 20px rgba(0,0,0,0.5);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--c-dark2);
  color: var(--c-text);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* ===== 极光渐变背景 ===== */
.aurora-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  background: var(--c-dark2);
}

.aurora-layer {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  mix-blend-mode: screen;
}

.aurora-1 {
  width: 70vw; height: 70vw;
  top: -20%; left: -15%;
  background: radial-gradient(ellipse at center, #ff0080 0%, #ff00ff 45%, transparent 75%);
  animation: aurora-drift1 18s ease-in-out infinite alternate;
}

.aurora-2 {
  width: 60vw; height: 60vw;
  top: 30%; right: -20%;
  background: radial-gradient(ellipse at center, #ff00ff 0%, #8000ff 50%, transparent 75%);
  animation: aurora-drift2 22s ease-in-out infinite alternate;
}

.aurora-3 {
  width: 80vw; height: 40vw;
  bottom: -10%; left: 10%;
  background: radial-gradient(ellipse at center, #ff0080 0%, #ff4d94 40%, transparent 70%);
  animation: aurora-drift3 16s ease-in-out infinite alternate;
}

.mesh-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,0,128,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,0,128,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  animation: grid-shimmer 8s ease-in-out infinite alternate;
}

@keyframes aurora-drift1 {
  0%   { transform: translate(0,0) scale(1); }
  100% { transform: translate(8vw, 6vh) scale(1.15); }
}
@keyframes aurora-drift2 {
  0%   { transform: translate(0,0) scale(1.05); }
  100% { transform: translate(-6vw, -8vh) scale(0.9); }
}
@keyframes aurora-drift3 {
  0%   { transform: translate(0,0) scale(1); }
  100% { transform: translate(-4vw, 5vh) scale(1.1); }
}
@keyframes grid-shimmer {
  0%   { opacity: 0.6; }
  100% { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .aurora-layer, .mesh-grid { animation: none; }
  html { scroll-behavior: auto; }
}

/* ===== 站点骨架 ===== */
.site-wrapper {
  position: relative;
  z-index: 1;
  display: flex;
  min-height: 100vh;
}

/* ===== 左侧固定竖排导航 ===== */
.sidenav {
  position: fixed;
  top: 0; left: 0;
  width: var(--nav-w);
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: rgba(26, 15, 22, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-right: 1px solid var(--c-border);
  z-index: 100;
  overflow-y: auto;
  overflow-x: hidden;
  transition: transform var(--transition);
}

.sidenav-brand {
  padding: 28px 20px 20px;
  border-bottom: 1px solid var(--c-border);
}

.brand-link {
  display: block;
  text-decoration: none;
  min-height: 44px;
  display: flex;
  align-items: center;
}

.brand-logo-img {
  max-width: 160px;
  height: auto;
  display: block;
}

.brand-text-logo {
  font-family: var(--font-brand);
  font-size: 1rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.3;
  display: block;
  white-space: nowrap;
}

.sidenav-menu {
  flex: 1;
  padding: 16px 0;
}

.nav-dl {
  list-style: none;
}

.nav-item {
  margin: 0;
}

.nav-item a {
  display: flex;
  align-items: center;
  padding: 0 24px;
  height: 48px;
  color: var(--c-text-muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  border-left: 3px solid transparent;
  transition: color var(--transition), border-color var(--transition), background var(--transition), padding-left var(--transition);
}

.nav-item a:hover,
.nav-item a:focus-visible {
  color: var(--c-primary);
  border-left-color: var(--c-primary);
  background: rgba(255, 0, 128, 0.08);
  padding-left: 28px;
  outline: none;
}

.sidenav-toggle {
  display: none;
  position: fixed;
  top: 14px; left: 14px;
  z-index: 200;
  width: 44px; height: 44px;
  background: rgba(26,15,22,0.9);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 10px;
  backdrop-filter: blur(10px);
}

.sidenav-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--c-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ===== 内容区 ===== */
.content-area {
  margin-left: var(--nav-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* ===== Hero ===== */
.hero-block {
  position: relative;
  min-height: 45vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 40px 80px;
  overflow: hidden;
  background: linear-gradient(135deg,
    rgba(255,0,128,0.22) 0%,
    rgba(255,0,255,0.15) 40%,
    rgba(38,23,31,0.1) 100%
  );
}

.hero-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 720px;
}

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--c-primary);
  margin-bottom: 14px;
  display: inline-block;
  padding: 4px 14px;
  border: 1px solid rgba(255,0,128,0.3);
  border-radius: 40px;
  background: rgba(255,0,128,0.08);
}

.hero-h1 {
  font-family: var(--font-brand);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 18px;
  background: linear-gradient(135deg, #fff 0%, var(--c-primary) 50%, var(--c-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% auto;
  animation: shimmer-text 4s linear infinite;
}

@keyframes shimmer-text {
  0%   { background-position: 0% center; }
  100% { background-position: 200% center; }
}

@media (prefers-reduced-motion: reduce) {
  .hero-h1 { animation: none; }
}

.hero-sub {
  font-size: 1rem;
  color: var(--c-text-muted);
  line-height: 1.65;
  max-width: 560px;
  margin: 0 auto;
}

/* 斜切底边色带 */
.hero-arc {
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 60px;
  background: var(--c-dark2);
  clip-path: polygon(0 60px, 100% 0, 100% 60px);
  z-index: 3;
}

/* ===== 主内容 ===== */
.main-content {
  flex: 1;
  padding: 40px 40px 60px;
}

.content-section {
  display: grid;
  grid-template-columns: 1fr 260px;
  grid-template-areas:
    "content aside"
    "figure aside";
  gap: 32px;
  max-width: 1100px;
  margin: 0 auto;
  align-items: start;
}

.page-content-wrap {
  grid-area: content;
  min-width: 0;
}

.content-figure {
  grid-area: figure;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  margin: 0;
}

.prism-card {
  width: 100%;
  max-width: 220px;
  aspect-ratio: 1;
  border-radius: var(--radius-card);
  background: linear-gradient(135deg, rgba(255,0,128,0.3), rgba(255,0,255,0.3));
  border: 1px solid rgba(255,0,255,0.2);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  position: relative;
}

.prism-inner {
  position: absolute;
  inset: 0;
  background: conic-gradient(
    from 0deg at 50% 50%,
    rgba(255,0,128,0.5),
    rgba(255,0,255,0.5),
    rgba(128,0,255,0.4),
    rgba(255,0,128,0.5)
  );
  animation: prism-spin 8s linear infinite;
  filter: blur(8px);
}

@keyframes prism-spin {
  from { transform: rotate(0deg) scale(1.2); }
  to   { transform: rotate(360deg) scale(1.2); }
}

@media (prefers-reduced-motion: reduce) {
  .prism-inner { animation: none; }
}

/* ===== aside 侧边栏 ===== */
.content-aside {
  grid-area: aside;
  position: sticky;
  top: 24px;
  background: var(--c-card-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-card);
  padding: 24px 20px;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.aside-eyebrow {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--c-primary);
  margin-bottom: 6px;
}

.aside-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--c-border);
}

.aside-nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.aside-link {
  display: flex;
  align-items: center;
  padding: 0 12px;
  height: 44px;
  color: var(--c-text-muted);
  text-decoration: none;
  font-size: 0.88rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.aside-link:hover,
.aside-link:focus-visible {
  color: var(--c-primary);
  background: rgba(255,0,128,0.1);
  outline: none;
}

/* ===== page.content 内容样式 ===== */
.page-content-wrap div {
  scroll-margin-top: 80px;
  margin-bottom: 56px;
}

.page-content-wrap h2 {
  font-family: var(--font-brand);
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--c-border);
  position: relative;
}

.page-content-wrap h2::before {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 60px; height: 2px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  border-radius: 2px;
}

.page-content-wrap h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--c-primary);
  margin: 24px 0 12px;
}

.page-content-wrap p {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-text-muted);
  margin-bottom: 16px;
}

.page-content-wrap strong {
  color: var(--c-text);
  font-weight: 600;
}

.page-content-wrap a {
  color: var(--c-primary);
  text-decoration: none;
  border-bottom: 1px solid rgba(255,0,128,0.3);
  transition: color var(--transition), border-color var(--transition);
}

.page-content-wrap a:hover {
  color: var(--c-accent);
  border-bottom-color: var(--c-accent);
}

.page-content-wrap ul,
.page-content-wrap ol {
  padding-left: 1.5em;
  margin-bottom: 16px;
}

.page-content-wrap li {
  color: var(--c-text-muted);
  line-height: 1.7;
  margin-bottom: 6px;
  font-size: 1rem;
}

.page-content-wrap table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 24px;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-content-wrap th {
  background: rgba(255,0,128,0.15);
  color: var(--c-text);
  padding: 12px 16px;
  text-align: left;
  font-size: 0.9rem;
  font-weight: 600;
}

.page-content-wrap td {
  padding: 11px 16px;
  border-top: 1px solid var(--c-border);
  color: var(--c-text-muted);
  font-size: 0.92rem;
}

.page-content-wrap tr:hover td {
  background: rgba(255,0,128,0.05);
}

/* div 卡片感 */
.page-content-wrap div {
  background: var(--c-card-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-card);
  padding: 32px 36px;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: box-shadow var(--transition), transform var(--transition);
}

.page-content-wrap div:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

@media (prefers-reduced-motion: reduce) {
  .page-content-wrap div:hover { transform: none; }
}

/* ===== small 眉题 ===== */
small {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--c-primary);
}

small + h2,
small + h3 {
  margin-top: 6px;
}

/* ===== 页脚 ===== */
.site-footer {
  background: rgba(18, 10, 15, 0.95);
  border-top: 1px solid var(--c-border);
  padding: 48px 40px 0;
}

.footer-row {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
  max-width: 1100px;
  margin: 0 auto;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--c-border);
}

.footer-brand {
  flex: 1;
  min-width: 220px;
}

.footer-logo-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  margin-bottom: 12px;
  min-height: 44px;
}

.footer-desc {
  font-size: 0.88rem;
  color: var(--c-text-muted);
  line-height: 1.65;
  max-width: 340px;
  margin-bottom: 10px;
}

.footer-contact a {
  color: var(--c-primary);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color var(--transition);
}

.footer-contact a:hover { color: var(--c-accent); }

.footer-nav {
  min-width: 180px;
}

.footer-dl {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-dl dt {
  margin: 0;
}

.footer-dl dt a {
  display: flex;
  align-items: center;
  padding: 0 8px;
  height: 44px;
  color: var(--c-text-muted);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color var(--transition), padding-left var(--transition), border-color var(--transition);
  border-left: 2px solid transparent;
}

.footer-dl dt a:hover,
.footer-dl dt a:focus-visible {
  color: var(--c-primary);
  border-left-color: var(--c-primary);
  padding-left: 12px;
  outline: none;
}

.footer-bottom {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 0;
  text-align: center;
}

.footer-copy {
  font-size: 0.8rem;
  color: rgba(201, 168, 188, 0.5);
}

/* ===== scroll-margin-top for sections ===== */
div[id] {
  scroll-margin-top: 24px;
}

/* ===== 通用工具 ===== */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

a:focus-visible {
  outline: 2px solid var(--c-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ===== 移动端响应式 ===== */
@media (max-width: 900px) {
  .content-section {
    grid-template-columns: 1fr;
    grid-template-areas:
      "aside"
      "content"
      "figure";
  }

  .content-figure {
    display: none;
  }

  .content-aside {
    position: static;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-w: 0px;
  }

  .sidenav {
    transform: translateX(-260px);
    width: 260px;
  }

  .sidenav.is-open {
    transform: translateX(0);
  }

  .sidenav-toggle {
    display: flex;
  }

  .content-area {
    margin-left: 0;
  }

  .hero-block {
    padding: 80px 24px 70px;
    min-height: 45vh;
  }

  .main-content {
    padding: 32px 20px 48px;
  }

  .page-content-wrap div {
    padding: 24px 20px;
  }

  .site-footer {
    padding: 40px 20px 0;
  }

  .footer-row {
    flex-direction: column;
    gap: 32px;
  }

  .sidenav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .sidenav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }
  .sidenav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}

@media (max-width: 480px) {
  .hero-h1 { font-size: 1.6rem; }
  .hero-eyebrow { font-size: 0.72rem; }
  .hero-sub { font-size: 0.92rem; }
}