@import url('https://fonts.googleapis.com/css2?family=Caveat:wght@400;500;600;700&family=Quicksand:wght@300;400;500;600;700&display=swap');

/* ============================================================
   CSS 自定义属性
   ============================================================ */
:root {
  --c-primary:   #6514ff;
  --c-secondary: #bf00ff;
  --c-dark:      #1c1726;
  --c-dark-alt:  #251e35;
  --c-dark-soft: #2e2546;
  --c-light:     #f5f0ff;
  --c-text:      #e8e0ff;
  --c-muted:     #a090c8;
  --c-white:     #ffffff;
  --c-accent:    #ff3cac;
  --c-neon:      #d400ff;

  --font-display: 'Caveat', cursive;
  --font-body:    'Quicksand', system-ui, sans-serif;

  --nav-width:    260px;
  --radius-card:  18px;
  --radius-sm:    8px;
  --gap-lg:       64px;
  --gap-md:       48px;
  --gap-sm:       24px;
  --transition:   220ms ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 17px;
  background: var(--c-dark);
  color: var(--c-text);
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

body.home-page { background: var(--c-dark); }

img { display: block; max-width: 100%; height: auto; }
a { color: var(--c-secondary); text-decoration: none; }
a:hover { color: var(--c-accent); }
button { cursor: pointer; font-family: var(--font-body); }

.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;
}

/* ============================================================
   布局骨架
   ============================================================ */
.site-wrapper {
  display: flex;
  min-height: 100vh;
}

.page-body {
  margin-left: var(--nav-width);
  flex: 1;
  min-width: 0;
}

/* ============================================================
   左侧固定导航
   ============================================================ */
.side-nav {
  position: fixed;
  top: 0; left: 0;
  width: var(--nav-width);
  height: 100vh;
  background: var(--c-dark-alt);
  border-right: 2px solid var(--c-primary);
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
  padding: 28px 20px;
  z-index: 200;
  overflow-y: auto;
}

.side-nav__brand { flex-shrink: 0; }

.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  min-height: 48px;
  padding: 4px 0;
}

.brand-text {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.2;
  letter-spacing: .02em;
}

.brand-logo { width: 120px; height: auto; }

/* 搜索框 */
.side-nav__search { flex-shrink: 0; }

.search-form {
  display: flex;
  gap: 6px;
  background: var(--c-dark-soft);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  border: 1px solid var(--c-primary);
  min-height: 48px;
  align-items: center;
}

.search-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 0.9rem;
  min-width: 0;
  min-height: 36px;
}

.search-input::placeholder { color: var(--c-muted); }

.search-btn {
  background: none;
  border: none;
  color: var(--c-secondary);
  font-size: 1rem;
  padding: 0 4px;
  display: flex;
  align-items: center;
  min-height: 40px;
  min-width: 36px;
  justify-content: center;
}

/* 导航链接 —— 结构：nav > p > a */
.side-nav__links nav { flex: 1; }

.side-nav__links nav > p {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.side-nav__links nav > p > a {
  display: flex;
  align-items: center;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--c-text);
  transition: background var(--transition), color var(--transition), transform var(--transition);
  border-left: 3px solid transparent;
  min-height: 44px;
}

.side-nav__links nav > p > a:hover {
  background: var(--c-dark-soft);
  color: var(--c-white);
  border-left-color: var(--c-secondary);
  transform: translateX(4px);
}

/* 汉堡按钮 */
.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 8px;
  align-self: flex-end;
  min-height: 44px;
  min-width: 44px;
  justify-content: center;
  align-items: center;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.hamburger:hover { background: var(--c-dark-soft); }

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--c-secondary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

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

/* ============================================================
   全屏遮罩菜单
   ============================================================ */
.fullscreen-menu {
  position: fixed;
  inset: 0;
  background: linear-gradient(135deg, var(--c-dark) 0%, var(--c-primary) 60%, var(--c-secondary) 100%);
  z-index: 300;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 300ms ease;
}

.fullscreen-menu:not([hidden]) {
  opacity: 1;
  pointer-events: all;
}

.fullscreen-menu[hidden] { display: flex; }

.fullscreen-menu__close {
  position: absolute;
  top: 28px; right: 32px;
  background: none;
  border: 2px solid var(--c-white);
  color: var(--c-white);
  font-size: 1.5rem;
  width: 48px; height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), transform var(--transition);
}

.fullscreen-menu__close:hover {
  background: var(--c-accent);
  border-color: var(--c-accent);
  transform: rotate(90deg);
}

.fullscreen-menu__nav { z-index: 1; }

.fullscreen-menu__nav > p {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.fullscreen-menu__link {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--c-white);
  text-decoration: none;
  letter-spacing: .04em;
  padding: 10px 32px;
  min-height: 56px;
  display: flex;
  align-items: center;
  border-radius: 999px;
  transition: background var(--transition), color var(--transition), transform var(--transition);
  position: relative;
}

.fullscreen-menu__link::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background: var(--c-white);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
  z-index: -1;
}

.fullscreen-menu__link:hover { color: var(--c-primary); }
.fullscreen-menu__link:hover::before { transform: scaleX(1); }

/* 装饰几何 */
.fullscreen-menu__deco { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }

.geo-circle {
  position: absolute;
  border-radius: 50%;
  border: 3px solid rgba(255,255,255,0.15);
}
.geo-circle--1 { width: 300px; height: 300px; top: -80px; left: -80px; }
.geo-circle--2 { width: 200px; height: 200px; bottom: 60px; right: -40px; border-color: rgba(191,0,255,0.3); }

.geo-tri {
  position: absolute;
  bottom: 120px; left: 10%;
  width: 0; height: 0;
  border-left: 40px solid transparent;
  border-right: 40px solid transparent;
  border-bottom: 70px solid rgba(255,255,255,0.08);
}

/* ============================================================
   Hero 区域
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  scroll-margin-top: 0;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__gradient {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--c-dark) 0%, #2d0a6e 45%, var(--c-primary) 80%, var(--c-secondary) 100%);
}

/* 动态背景图案 */
.hero__pattern {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(101,20,255,0.4) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(191,0,255,0.3) 0%, transparent 45%),
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 40px,
      rgba(255,255,255,0.03) 40px,
      rgba(255,255,255,0.03) 41px
    );
  animation: patternShift 8s ease-in-out infinite alternate;
}

@keyframes patternShift {
  from { background-position: 0% 0%, 100% 100%, 0 0; }
  to   { background-position: 10% 15%, 85% 80%, 40px 40px; }
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  padding: var(--gap-lg) var(--gap-md);
  padding-top: calc(var(--gap-lg) + 40px);
}

.hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--c-white);
  border: 2px solid currentColor;
  min-height: 40px;
}

.badge--pulse {
  background: var(--c-primary);
  border-color: var(--c-primary);
  animation: badgePulse 2s ease-in-out infinite;
}

.badge--float {
  background: transparent;
  border-color: var(--c-secondary);
  color: var(--c-secondary);
  animation: badgeFloat 3s ease-in-out infinite;
}

.badge--glow {
  background: var(--c-accent);
  border-color: var(--c-accent);
  box-shadow: 0 0 18px rgba(255,60,172,0.6);
}

@keyframes badgePulse {
  0%,100% { box-shadow: 0 0 0 0 rgba(101,20,255,0.5); }
  50%      { box-shadow: 0 0 0 8px rgba(101,20,255,0); }
}

@keyframes badgeFloat {
  0%,100% { transform: translateY(0); }
  50%      { transform: translateY(-6px); }
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 5rem);
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.1;
  letter-spacing: .02em;
  margin-bottom: 20px;
  text-shadow: 0 4px 24px rgba(101,20,255,0.5);
}

.hero__sub {
  font-size: 1.15rem;
  color: rgba(232,224,255,0.85);
  max-width: 520px;
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

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

/* ============================================================
   按钮
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .04em;
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
  min-height: 48px;
  cursor: pointer;
}

.btn--primary {
  background: linear-gradient(135deg, var(--c-primary), var(--c-secondary));
  color: var(--c-white);
  border-color: transparent;
  box-shadow: 0 6px 24px rgba(101,20,255,0.4);
}

.btn--primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(191,0,255,0.5);
  color: var(--c-white);
}

.btn--outline {
  background: transparent;
  border-color: var(--c-white);
  color: var(--c-white);
}

.btn--outline:hover {
  background: var(--c-white);
  color: var(--c-primary);
  transform: translateY(-3px);
}

.btn--sm {
  padding: 10px 22px;
  font-size: 0.9rem;
  min-height: 44px;
}

/* ============================================================
   主内容区 — main > section > div 三层
   ============================================================ */
.main-content {
  display: flex;
  gap: var(--gap-md);
  padding: var(--gap-lg) var(--gap-md);
  max-width: 1280px;
  margin: 0 auto;
  align-items: flex-start;
}

/* ============================================================
   侧边栏（内容区左侧）
   ============================================================ */
.sidebar {
  flex: 0 0 220px;
  position: sticky;
  top: 24px;
}

.sidebar__inner {
  background: var(--c-dark-alt);
  border: 1px solid var(--c-primary);
  border-radius: var(--radius-card);
  padding: 28px 20px;
  position: relative;
  overflow: hidden;
}

.sidebar__inner h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 6px;
}

.sidebar__inner .subtitle {
  font-size: 0.82rem;
  color: var(--c-muted);
  margin-bottom: 20px;
}

.sidebar__inner nav a.sidebar__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--c-text);
  transition: background var(--transition), color var(--transition);
  min-height: 44px;
  margin-bottom: 4px;
}

.sidebar__link::before {
  content: '▸';
  color: var(--c-secondary);
  font-size: 0.8rem;
  flex-shrink: 0;
}

.sidebar__link:hover {
  background: var(--c-dark-soft);
  color: var(--c-white);
}

.sidebar__deco {
  position: absolute;
  bottom: -20px; right: -20px;
  width: 80px; height: 80px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--c-primary) 0%, transparent 70%);
  opacity: .3;
}

/* ============================================================
   正文文章区
   ============================================================ */
.content-article {
  flex: 1;
  min-width: 0;
}

.content-section {
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
}

/* 注入 page.content 的子 div 样式 */
.content-section div {
  background: var(--c-dark-alt);
  border-radius: var(--radius-card);
  padding: var(--gap-md) var(--gap-sm);
  border: 1px solid rgba(101,20,255,0.25);
  scroll-margin-top: 80px;
  position: relative;
  overflow: hidden;
}

.content-section div::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, var(--c-primary), var(--c-secondary));
  border-radius: 4px 0 0 4px;
}

.content-section div h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 8px;
  line-height: 1.2;
}

.content-section div .subtitle,
.content-section div h2 + p:first-of-type {
  color: var(--c-muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

.content-section div h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--c-secondary);
  margin: 28px 0 10px;
}

.content-section div p {
  margin-bottom: 14px;
  color: var(--c-text);
  line-height: 1.8;
  font-size: 1rem;
}

.content-section div ul,
.content-section div ol {
  padding-left: 24px;
  margin-bottom: 14px;
}

.content-section div li {
  margin-bottom: 8px;
  color: var(--c-text);
  line-height: 1.7;
}

.content-section div a {
  color: var(--c-secondary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.content-section div a:hover { color: var(--c-accent); }

.content-section div strong { color: var(--c-white); font-weight: 700; }

.content-section div table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.content-section div th,
.content-section div td {
  padding: 12px 16px;
  border: 1px solid rgba(101,20,255,0.3);
  text-align: left;
}

.content-section div th {
  background: rgba(101,20,255,0.2);
  color: var(--c-white);
  font-weight: 700;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: var(--c-dark-alt);
  border-top: 2px solid var(--c-primary);
  margin-top: var(--gap-lg);
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--gap-md);
  padding: var(--gap-lg) var(--gap-md);
  max-width: 1280px;
  margin: 0 auto;
}

.footer-col h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 6px;
}

.footer-col .subtitle {
  font-size: 0.82rem;
  color: var(--c-muted);
  margin-bottom: 18px;
}

.footer-brand-text {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--c-white);
  display: block;
  margin-bottom: 12px;
}

.footer-desc {
  color: var(--c-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* 页脚导航 nav > p > a */
.footer-col--links nav > p {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-col--links nav > p > a {
  color: var(--c-muted);
  font-size: 0.9rem;
  padding: 8px 0;
  min-height: 44px;
  display: flex;
  align-items: center;
  transition: color var(--transition), transform var(--transition);
}

.footer-col--links nav > p > a:hover {
  color: var(--c-secondary);
  transform: translateX(4px);
}

/* 联系表单 */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.form-input,
.form-textarea {
  background: var(--c-dark-soft);
  border: 1px solid rgba(101,20,255,0.4);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 0.9rem;
  transition: border-color var(--transition);
  width: 100%;
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--c-secondary);
}

.form-input::placeholder,
.form-textarea::placeholder { color: var(--c-muted); }

.form-textarea { resize: vertical; min-height: 80px; }

/* 底栏：logo + nav + copyright 横排 */
.footer-bottom {
  border-top: 1px solid rgba(101,20,255,0.2);
  padding: 18px var(--gap-md);
}

.footer-bottom__inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom__inner nav > p {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
}

.footer-bottom__inner nav > p > a {
  color: var(--c-muted);
  font-size: 0.85rem;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  transition: color var(--transition);
}

.footer-bottom__inner nav > p > a:hover { color: var(--c-secondary); }

.copyright {
  color: var(--c-muted);
  font-size: 0.85rem;
}

/* ============================================================
   标题装饰：h2 + p.subtitle
   ============================================================ */
h2 + p.subtitle,
h2 + .subhead,
h2 + .desc,
h2 + .lead {
  color: var(--c-muted);
  font-size: 0.9rem;
  margin-top: -4px;
  margin-bottom: 16px;
}

/* ============================================================
   Scroll-margin（固定侧边栏补偿）
   ============================================================ */
div[id] { scroll-margin-top: 40px; }

/* ============================================================
   动效 & Hover Micro-interaction
   ============================================================ */
.content-section div {
  transition: border-color var(--transition), box-shadow var(--transition);
}

.content-section div:hover {
  border-color: rgba(191,0,255,0.45);
  box-shadow: 0 8px 40px rgba(101,20,255,0.18);
}

/* 浮动徽章持续动画 */
@keyframes floatSlow {
  0%,100% { transform: translateY(0) rotate(-3deg); }
  50%      { transform: translateY(-10px) rotate(3deg); }
}

.badge--float { animation: floatSlow 4s ease-in-out infinite; }

/* ============================================================
   prefers-reduced-motion
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

/* ============================================================
   响应式
   ============================================================ */

/* 中等屏幕 */
@media (max-width: 1024px) {
  :root { --nav-width: 220px; }

  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: var(--gap-sm);
  }

  .footer-col--contact { grid-column: 1 / -1; }
}

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

  .site-wrapper { flex-direction: column; }

  .page-body { margin-left: 0; }

  /* 竖排侧边栏改为顶部折叠 */
  .side-nav {
    position: fixed;
    width: 100%;
    height: auto;
    bottom: auto;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
    padding: 12px 16px;
    border-right: none;
    border-bottom: 2px solid var(--c-primary);
    z-index: 200;
    align-items: center;
  }

  .side-nav__links { display: none; }

  .side-nav__brand { flex: 1; }

  .brand-text { font-size: 1.2rem; }

  .side-nav__search { order: 3; width: 100%; }

  .hamburger { order: 2; }

  .hero__content {
    padding: calc(var(--gap-md) + 80px) var(--gap-sm) var(--gap-md);
  }

  .hero__title { font-size: 2.2rem; }

  .main-content {
    flex-direction: column;
    padding: var(--gap-md) var(--gap-sm);
    gap: var(--gap-sm);
  }

  .sidebar {
    flex: none;
    width: 100%;
    position: static;
  }

  .footer-top {
    grid-template-columns: 1fr;
    padding: var(--gap-md) var(--gap-sm);
  }

  .footer-col--contact { grid-column: auto; }

  .footer-bottom { padding: 16px var(--gap-sm); }

  .footer-bottom__inner { flex-direction: column; align-items: flex-start; }

  .fullscreen-menu__link { font-size: 1.6rem; }
}

/* 手机 */
@media (max-width: 480px) {
  html { font-size: 16px; }

  .hero__title { font-size: 1.9rem; }

  .hero__cta { flex-direction: column; }

  .btn { width: 100%; justify-content: center; }

  .content-section div { padding: var(--gap-sm) 16px; }

  .fullscreen-menu__link { font-size: 1.4rem; padding: 10px 20px; }
}

/* 375px 最小屏保险 */
@media (max-width: 375px) {
  .hero__title { font-size: 1.7rem; }
  .hero__badges { gap: 8px; }
  .badge { font-size: 0.85rem; padding: 6px 14px; min-height: 40px; }
}