:root {
  --color-primary: #6366f1;
  --color-primary-dark: #4f46e5;
  --color-primary-light: rgba(99, 102, 241, 0.1);
  --color-accent: #a78bfa;
  --color-gold: #f59e0b;
  --color-space: #0f0b1e;
  --color-space-light: #1a1533;
  --color-surface: #1e1a35;
  --color-text: #c8c5d6;
  --color-text-light: #8b87a0;
  --color-text-bright: #eee9ff;
  --color-border: rgba(99, 102, 241, 0.15);
  --color-card: rgba(30, 26, 53, 0.8);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --container-max: 1200px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-space);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 120px 0;
  position: relative;
}

.section__header {
  text-align: center;
  margin-bottom: 64px;
}

.section__tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  background: var(--color-primary-light);
  padding: 6px 18px;
  border-radius: 100px;
  margin-bottom: 16px;
  border: 1px solid var(--color-border);
}

.section__title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-text-bright);
  margin-bottom: 12px;
  line-height: 1.2;
}

.section__desc {
  font-size: 1.1rem;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 11, 30, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

.header.scrolled {
  border-bottom-color: var(--color-border);
  background: rgba(15, 11, 30, 0.95);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav__logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-bright);
  letter-spacing: 0.02em;
}

.nav__list {
  display: flex;
  gap: 8px;
}

.nav__link {
  display: block;
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-light);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-text-bright);
  background: var(--color-primary-light);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
}

.nav__toggle span {
  display: block;
  height: 2px;
  background: var(--color-text-bright);
  border-radius: 2px;
  transition: var(--transition);
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: radial-gradient(ellipse at 30% 50%, rgba(99, 102, 241, 0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 30%, rgba(167, 139, 250, 0.06) 0%, transparent 50%),
              var(--color-space);
}

.hero__stars {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__star {
  position: absolute;
  width: 2px;
  height: 2px;
  background: #fff;
  border-radius: 50%;
  animation: twinkle var(--duration) ease-in-out infinite;
  opacity: 0;
}

@keyframes twinkle {
  0%, 100% { opacity: 0; }
  50% { opacity: var(--max-opacity); }
}

.hero__container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 60px;
  padding-top: 72px;
  position: relative;
  z-index: 1;
}

.hero__badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  background: var(--color-primary-light);
  border: 1px solid var(--color-border);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 24px;
}

.hero__title {
  font-size: 3.75rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--color-text-bright);
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--color-text-bright) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 1.1rem;
  color: var(--color-text);
  margin-bottom: 40px;
  max-width: 500px;
  line-height: 1.8;
}

.hero__actions {
  display: flex;
  gap: 16px;
}

.hero__visual {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  width: 100%;
  height: 400px;
}

.hero__star-core {
  width: 24px;
  height: 24px;
  background: radial-gradient(circle, var(--color-gold) 0%, var(--color-primary) 60%, transparent 100%);
  border-radius: 50%;
  box-shadow: 0 0 60px 20px rgba(245, 158, 11, 0.3),
              0 0 120px 40px rgba(99, 102, 241, 0.15);
  position: relative;
  z-index: 2;
}

.hero__orbit {
  position: absolute;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  animation: orbit-spin linear infinite;
}

.hero__orbit--1 {
  width: 160px;
  height: 160px;
  animation-duration: 12s;
}

.hero__orbit--2 {
  width: 280px;
  height: 280px;
  animation-duration: 20s;
  animation-direction: reverse;
}

.hero__orbit--3 {
  width: 380px;
  height: 380px;
  animation-duration: 30s;
  border-style: dashed;
  opacity: 0.5;
}

.hero__orbit::after {
  content: '';
  position: absolute;
  top: -4px;
  left: 50%;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--color-accent);
}

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

.hero__scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-text-light);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  z-index: 1;
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: var(--color-text-light);
  animation: scrollDown 2s ease-in-out infinite;
}

@keyframes scrollDown {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 30px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition);
  cursor: pointer;
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: #fff;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.35);
}

.btn--primary:hover {
  box-shadow: 0 6px 28px rgba(99, 102, 241, 0.5);
  transform: translateY(-2px);
}

.btn--ghost {
  border: 1.5px solid var(--color-border);
  color: var(--color-text-bright);
}

.btn--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-primary-light);
}

/* About */
.about__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 60px;
}

.about__card {
  background: var(--color-card);
  padding: 36px 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: var(--transition);
  text-align: center;
  backdrop-filter: blur(8px);
}

.about__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: var(--color-primary);
}

.about__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  color: var(--color-accent);
  border: 1px solid var(--color-border);
}

.about__icon svg {
  width: 28px;
  height: 28px;
}

.about__card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-bright);
  margin-bottom: 10px;
}

.about__card-desc {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

.about__manifesto {
  text-align: center;
  padding: 48px;
  background: linear-gradient(135deg, var(--color-card) 0%, rgba(99, 102, 241, 0.05) 100%);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.about__manifesto-text {
  font-size: 1.15rem;
  line-height: 1.8;
  color: var(--color-text);
  max-width: 720px;
  margin: 0 auto;
}

.about__manifesto-text strong {
  color: var(--color-accent);
  font-weight: 600;
}

/* Vision */
.vision {
  background: linear-gradient(180deg, var(--color-space) 0%, var(--color-space-light) 50%, var(--color-space) 100%);
}

.vision__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 48px;
}

.vision__card {
  background: var(--color-card);
  padding: 48px 36px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  text-align: center;
  backdrop-filter: blur(8px);
  transition: var(--transition);
}

.vision__card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.vision__symbol {
  font-size: 2.5rem;
  margin-bottom: 20px;
  color: var(--color-gold);
  text-shadow: 0 0 20px rgba(245, 158, 11, 0.3);
}

.vision__card-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text-bright);
  margin-bottom: 12px;
}

.vision__card-desc {
  font-size: 1rem;
  color: var(--color-text);
  line-height: 1.8;
}

.vision__quote {
  text-align: center;
  padding: 40px;
  margin: 0 auto 40px;
  max-width: 800px;
  position: relative;
}

.vision__quote::before {
  content: '\201C';
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 4rem;
  color: var(--color-primary);
  opacity: 0.3;
  line-height: 1;
}

.vision__quote p {
  font-size: 1.1rem;
  font-style: italic;
  color: var(--color-text);
  line-height: 1.9;
}

.vision__goal {
  text-align: center;
  padding: 32px;
  background: var(--color-primary-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  max-width: 800px;
  margin: 0 auto;
}

.vision__goal p {
  font-size: 1rem;
  color: var(--color-text);
  line-height: 1.8;
}

.vision__goal strong {
  color: var(--color-accent);
}

/* Culture */
.culture__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.culture__card {
  background: var(--color-card);
  padding: 40px 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.culture__card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.culture__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: var(--transition);
}

.culture__card:hover::before {
  opacity: 1;
}

.culture__number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-primary);
  opacity: 0.15;
  line-height: 1;
  margin-bottom: 16px;
}

.culture__card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-bright);
  margin-bottom: 12px;
}

.culture__card-desc {
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.8;
}

/* Footer */
.footer {
  background: var(--color-space-light);
  border-top: 1px solid var(--color-border);
  padding: 60px 0 0;
}

.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-border);
}

.footer__logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-bright);
  display: block;
  margin-bottom: 12px;
}

.footer__desc {
  font-size: 0.95rem;
  color: var(--color-text);
  margin-bottom: 4px;
}

.footer__en {
  font-size: 0.8rem;
  color: var(--color-text-light);
  letter-spacing: 0.05em;
}

.footer__heading {
  color: var(--color-text-bright);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer__links ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer__links a,
.footer__links li {
  font-size: 0.875rem;
  color: var(--color-text-light);
  transition: var(--transition);
}

.footer__links a:hover {
  color: var(--color-text-bright);
}

.footer__bottom {
  padding: 20px 0;
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-light);
}

/* Scroll Top */
.scroll-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 99;
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top:hover {
  background: var(--color-primary-dark);
}

.scroll-top svg {
  width: 20px;
  height: 20px;
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 1024px) {
  .hero__title {
    font-size: 2.75rem;
  }

  .about__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .culture__grid {
    grid-template-columns: 1fr;
  }

  .footer__inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 80px 0;
  }

  .section__title {
    font-size: 1.75rem;
  }

  .nav__toggle {
    display: flex;
  }

  .nav__menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-space);
    border-bottom: 1px solid var(--color-border);
    padding: 24px;
    transform: translateY(-120%);
    transition: var(--transition);
    box-shadow: var(--shadow-card);
  }

  .nav__menu.open {
    transform: translateY(0);
  }

  .nav__list {
    flex-direction: column;
    gap: 4px;
  }

  .hero__container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero__title {
    font-size: 2.25rem;
  }

  .hero__subtitle {
    margin: 0 auto 40px;
  }

  .hero__actions {
    justify-content: center;
  }

  .hero__visual {
    display: none;
  }

  .about__grid {
    grid-template-columns: 1fr;
  }

  .vision__grid {
    grid-template-columns: 1fr;
  }

  .culture__grid {
    grid-template-columns: 1fr;
  }

  .footer__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}