/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: #0A0A0A;
  color: #E0E0E0;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
:focus-visible {
  outline: 2px solid #00FFFF;
  outline-offset: 3px;
  border-radius: 4px;
}

/* ===== CSS VARIABLES ===== */
:root {
  --color-primary: #0B1A30;
  --color-accent: #8A2BE2;
  --color-secondary: #C0C0C0;
  --color-bg: #0A0A0A;
  --color-highlight: #00FFFF;
  --color-text: #E0E0E0;
  --color-text-accent: #D4A5FF;
  --color-glass: rgba(11, 26, 48, 0.6);
  --font-title: 'Exo 2', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
  --container-max: 1200px;
  --header-h: 70px;
  --radius: 12px;
  --transition: 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* ===== SKIP LINK ===== */
.pg-skip-link {
  position: fixed;
  top: -100px;
  left: 20px;
  z-index: 9999;
  background: var(--color-highlight);
  color: #0A0A0A;
  padding: 10px 20px;
  border-radius: 0 0 8px 8px;
  font-weight: 600;
  transition: top 0.3s;
}
.pg-skip-link:focus { top: 0; }

/* ===== CONTAINER ===== */
.pg-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== HEADER ===== */
.pg-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-h);
  background: var(--color-glass);
  backdrop-filter: blur(18px) saturate(1.2);
  -webkit-backdrop-filter: blur(18px) saturate(1.2);
  border-bottom: 1px solid rgba(138, 43, 226, 0.25);
  z-index: 1000;
  transition: background var(--transition);
}
.pg-header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.pg-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--color-text-accent);
  letter-spacing: 1px;
  transition: color var(--transition);
}
.pg-logo:hover { color: var(--color-highlight); }
.pg-logo-icon {
  font-size: 1.8rem;
  line-height: 1;
  color: var(--color-accent);
  filter: drop-shadow(0 0 6px rgba(138, 43, 226, 0.5));
}
.pg-logo-text { color: var(--color-text-accent); }

/* ===== NAVIGATION ===== */
.pg-nav-list {
  display: flex;
  align-items: center;
  gap: 6px;
}
.pg-nav-list a {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 30px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-secondary);
  background: transparent;
  border: 1px solid transparent;
  transition: all var(--transition);
  white-space: nowrap;
}
.pg-nav-list a:hover {
  color: var(--color-highlight);
  background: rgba(0, 255, 255, 0.08);
  border-color: rgba(0, 255, 255, 0.2);
}
.pg-nav-list a[aria-current="page"] {
  color: #fff;
  background: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: 0 0 20px rgba(138, 43, 226, 0.35);
}
.pg-nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}
.pg-nav-toggle-line {
  display: block;
  width: 28px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}
.pg-nav-toggle[aria-expanded="true"] .pg-nav-toggle-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.pg-nav-toggle[aria-expanded="true"] .pg-nav-toggle-line:nth-child(2) {
  opacity: 0;
}
.pg-nav-toggle[aria-expanded="true"] .pg-nav-toggle-line:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== MOBILE NAV ===== */
@media (max-width: 768px) {
  .pg-nav-toggle { display: flex; }
  .pg-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: rgba(10, 10, 10, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-left: 1px solid rgba(138, 43, 226, 0.3);
    padding: 80px 30px 30px;
    transition: right 0.4s cubic-bezier(0.22, 1, 0.36, 1);
    box-shadow: -10px 0 40px rgba(0,0,0,0.6);
  }
  .pg-nav[data-open] { right: 0; }
  .pg-nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }
  .pg-nav-list a {
    font-size: 1.05rem;
    padding: 12px 20px;
    text-align: center;
    border-radius: 8px;
  }
}

/* ===== FOOTER ===== */
.pg-footer {
  margin-top: auto;
  background: var(--color-primary);
  border-top: 1px solid rgba(138, 43, 226, 0.2);
  padding: 50px 20px 20px;
}
.pg-footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
}
.pg-footer-brand {
  margin-bottom: 36px;
}
.pg-footer-logo {
  font-family: var(--font-title);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-text-accent);
  letter-spacing: 1px;
  transition: color var(--transition);
}
.pg-footer-logo:hover { color: var(--color-highlight); }
.pg-footer-desc {
  margin-top: 8px;
  font-size: 0.9rem;
  color: var(--color-secondary);
  opacity: 0.7;
}
.pg-footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-bottom: 36px;
}
.pg-footer-col-title {
  font-family: var(--font-title);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text-accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 16px;
}
.pg-footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.pg-footer-col a {
  font-size: 0.9rem;
  color: var(--color-secondary);
  opacity: 0.8;
  transition: all var(--transition);
  display: inline-block;
}
.pg-footer-col a:hover {
  color: var(--color-highlight);
  opacity: 1;
  transform: translateX(4px);
}
.pg-footer-contact li {
  font-size: 0.9rem;
  color: var(--color-secondary);
  opacity: 0.8;
  line-height: 1.5;
}
.pg-footer-bottom {
  border-top: 1px solid rgba(192, 192, 192, 0.1);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.8rem;
  color: var(--color-secondary);
  opacity: 0.6;
}
@media (max-width: 768px) {
  .pg-footer-links {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 480px) {
  .pg-footer-links {
    grid-template-columns: 1fr;
  }
  .pg-footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ===== COMMON COMPONENTS ===== */
.pg-glass {
  background: var(--color-glass);
  backdrop-filter: blur(14px) saturate(1.1);
  -webkit-backdrop-filter: blur(14px) saturate(1.1);
  border: 1px solid rgba(138, 43, 226, 0.15);
  border-radius: var(--radius);
}
.pg-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: var(--color-accent);
  color: #fff;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  border-radius: 30px;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 0 15px rgba(138, 43, 226, 0.2);
}
.pg-btn:hover {
  background: #9b3cf5;
  box-shadow: 0 0 30px rgba(138, 43, 226, 0.45);
  transform: translateY(-2px);
}
.pg-btn:focus-visible {
  outline: 2px solid var(--color-highlight);
  outline-offset: 3px;
}
.pg-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}
.pg-card {
  background: var(--color-glass);
  backdrop-filter: blur(10px) saturate(1.1);
  -webkit-backdrop-filter: blur(10px) saturate(1.1);
  border-radius: var(--radius);
  border: 1px solid rgba(138, 43, 226, 0.12);
  padding: 24px;
  transition: all var(--transition);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}
.pg-card:hover {
  border-color: rgba(138, 43, 226, 0.35);
  box-shadow: 0 8px 30px rgba(138, 43, 226, 0.12);
  transform: translateY(-4px);
}
.pg-section-title {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(1.8rem, 4vw, 3rem);
  color: var(--color-text-accent);
  letter-spacing: 1px;
  line-height: 1.15;
}
.pg-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-highlight);
  background: rgba(0, 255, 255, 0.08);
  border: 1px solid rgba(0, 255, 255, 0.15);
  padding: 4px 12px;
  border-radius: 20px;
}
.pg-slash-divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  margin: 24px 0;
  position: relative;
}
.pg-slash-divider::after {
  content: '//';
  position: absolute;
  right: 10px;
  top: -10px;
  font-size: 0.75rem;
  color: var(--color-accent);
  font-weight: 700;
  background: #0A0A0A;
  padding: 0 8px;
}

/* ===== UTILITY ===== */
.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;
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .pg-card:hover { transform: none; }
  .pg-btn:hover { transform: none; }
  .pg-nav { transition: none; }
}

/* ===== RESPONSIVE COMMON ===== */
@media (max-width: 768px) {
  .pg-grid { grid-template-columns: 1fr; }
  .pg-section-title { font-size: 1.6rem; }
}

/* ===== IMAGE PLACEHOLDER BASE ===== */
.pg-img-placeholder {
  width: 100%;
  background: linear-gradient(135deg, rgba(11,26,48,0.6), rgba(138,43,226,0.15));
  border-radius: var(--radius);
  border: 1px solid rgba(138,43,226,0.1);
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-secondary);
  font-size: 0.85rem;
  opacity: 0.7;
}
.pg-img-placeholder::before {
  content: '◈ 视觉介质';
  letter-spacing: 2px;
}

/* ===== MAIN CONTENT ANCHOR ===== */
#main-content {
  scroll-margin-top: calc(var(--header-h) + 16px);
}