/* ============================================
   青凡工作室官网 - 样式系统
   ============================================ */

/* --- CSS Variables --- */
:root {
  --color-bg: #0a0a0f;
  --color-bg-secondary: #111118;
  --color-bg-card: #16161f;
  --color-bg-card-hover: #1c1c28;
  --color-surface: #1e1e2a;
  --color-border: rgba(255, 255, 255, 0.06);
  --color-border-hover: rgba(255, 255, 255, 0.12);

  --color-text: #e8e8ed;
  --color-text-secondary: #8888a0;
  --color-text-muted: #55556a;

  --color-primary: #6c5ce7;
  --color-primary-light: #a29bfe;
  --color-primary-dark: #5a4bd1;
  --color-accent: #00cec9;
  --color-accent-light: #55efc4;

  --color-gradient-start: #6c5ce7;
  --color-gradient-end: #00cec9;

  --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;
  --font-size-hero: clamp(2.5rem, 6vw, 5rem);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(108, 92, 231, 0.15);

  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-spring: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);

  --container-max: 1200px;
  --container-padding: 1.5rem;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

ul { list-style: none; }

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

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

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 0;
  transition: all var(--transition-base);
  backdrop-filter: blur(0px);
}

.navbar.scrolled {
  padding: 0.6rem 0;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: var(--font-size-lg);
}

.logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 900;
  color: #fff;
}

.logo-text {
  background: linear-gradient(135deg, var(--color-text), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-link {
  padding: 0.5rem 1rem;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gradient-start), var(--color-gradient-end));
  border-radius: 1px;
}

/* Mobile Nav Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(108, 92, 231, 0.15), transparent),
    radial-gradient(ellipse 60% 50% at 80% 80%, rgba(0, 206, 201, 0.08), transparent),
    radial-gradient(ellipse 50% 40% at 20% 60%, rgba(108, 92, 231, 0.06), transparent);
}

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

.hero-particle {
  position: absolute;
  width: 3px;
  height: 3px;
  background: var(--color-primary-light);
  border-radius: 50%;
  opacity: 0;
  animation: floatParticle 8s infinite;
}

@keyframes floatParticle {
  0% { opacity: 0; transform: translateY(100vh) scale(0); }
  10% { opacity: 0.6; }
  90% { opacity: 0.6; }
  100% { opacity: 0; transform: translateY(-10vh) scale(1); }
}

.hero-content {
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: var(--font-size-hero);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.title-line {
  display: block;
  color: var(--color-text);
}

.title-line.accent {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  font-weight: 300;
  letter-spacing: 0.15em;
  margin-bottom: 2.5rem;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 2rem;
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  font-family: inherit;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: #fff;
  box-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(108, 92, 231, 0.45);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border-hover);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--color-primary-light);
  transform: translateY(-2px);
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  letter-spacing: 0.1em;
}

.mouse {
  width: 22px;
  height: 34px;
  border: 2px solid var(--color-text-muted);
  border-radius: 11px;
  position: relative;
}

.mouse::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 8px;
  background: var(--color-primary-light);
  border-radius: 2px;
  animation: scrollMouse 2s infinite;
}

@keyframes scrollMouse {
  0% { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(10px); }
}

/* --- Section Common --- */
.section {
  padding: 6rem 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-tag {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-primary-light);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 900;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--color-text), var(--color-text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

/* --- Games Section --- */
.games-section {
  background: var(--color-bg-secondary);
}

.games-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border-hover), transparent);
}

.games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2rem;
}

.game-card {
  position: relative;
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.game-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.game-cover {
  position: relative;
  width: 100%;
  height: 220px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-accent));
}

.game-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.game-card:hover .game-cover img {
  transform: scale(1.05);
}

.game-cover-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10, 10, 15, 0.8), transparent 60%);
}

.game-status {
  position: absolute;
  top: 1rem;
  right: 1rem;
  padding: 0.3rem 0.8rem;
  font-size: var(--font-size-xs);
  font-weight: 700;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
}

.game-status.released {
  background: rgba(85, 239, 196, 0.15);
  color: var(--color-accent-light);
  border: 1px solid rgba(85, 239, 196, 0.3);
}

.game-status.developing {
  background: rgba(108, 92, 231, 0.15);
  color: var(--color-primary-light);
  border: 1px solid rgba(108, 92, 231, 0.3);
}

.game-body {
  padding: 1.5rem;
}

.game-genre {
  font-size: var(--font-size-xs);
  color: var(--color-primary-light);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.game-title {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  margin-bottom: 0.25rem;
}

.game-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.game-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 1.25rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.game-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.game-tag {
  padding: 0.25rem 0.6rem;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.game-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.game-platforms {
  display: flex;
  gap: 0.5rem;
}

.platform-badge {
  padding: 0.2rem 0.5rem;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-sm);
}

.game-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary-light);
  transition: all var(--transition-fast);
}

.game-link:hover {
  color: var(--color-accent-light);
  gap: 0.6rem;
}

.game-link::after {
  content: '→';
  transition: transform var(--transition-fast);
}

/* --- About Section --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-text {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 2.5rem;
}

.about-stats {
  display: flex;
  gap: 3rem;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: var(--font-size-4xl);
  font-weight: 900;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

.about-visual {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.about-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: all var(--transition-base);
}

.about-card:hover {
  border-color: var(--color-border-hover);
  background: var(--color-bg-card-hover);
  transform: translateX(4px);
}

.card-icon {
  font-size: var(--font-size-2xl);
  margin-bottom: 0.75rem;
}

.about-card h3 {
  font-size: var(--font-size-base);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.about-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --- Contact Section --- */
.contact-section {
  background: var(--color-bg-secondary);
}

.contact-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border-hover), transparent);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.contact-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  transition: all var(--transition-base);
}

.contact-card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.contact-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.contact-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.contact-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  word-break: break-all;
}

.contact-link {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary-light);
  padding: 0.4rem 1.2rem;
  border: 1px solid rgba(108, 92, 231, 0.3);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.contact-link:hover {
  background: rgba(108, 92, 231, 0.1);
  border-color: var(--color-primary-light);
}

/* --- Footer --- */
.footer {
  padding: 3rem 0 1.5rem;
  border-top: 1px solid var(--color-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer-tagline {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-top: 0.75rem;
  margin-bottom: 1rem;
}

.social-links {
  display: flex;
  gap: 0.75rem;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.social-link:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.footer-nav h4,
.footer-info h4 {
  font-size: var(--font-size-sm);
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.footer-nav ul,
.footer-info ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-nav a,
.footer-info li {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer-nav a:hover {
  color: var(--color-primary-light);
}

.footer-bottom {
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.footer-bottom p {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* --- Animations --- */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.delay-1 { transition-delay: 0.15s; }
.delay-2 { transition-delay: 0.3s; }
.delay-3 { transition-delay: 0.45s; }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  :root {
    --container-padding: 1rem;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    flex-direction: column;
    background: rgba(10, 10, 15, 0.97);
    backdrop-filter: blur(20px);
    padding: 5rem 2rem 2rem;
    gap: 0.25rem;
    transition: right var(--transition-base);
    border-left: 1px solid var(--color-border);
  }

  .nav-menu.open {
    right: 0;
  }

  .nav-link {
    font-size: var(--font-size-lg);
    padding: 0.75rem 1rem;
    width: 100%;
  }

  .hero-title {
    font-size: clamp(2rem, 8vw, 3.5rem);
  }

  .hero-subtitle {
    font-size: var(--font-size-base);
  }

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

  .section-title {
    font-size: var(--font-size-3xl);
  }

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

  .about-stats {
    gap: 1.5rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .footer-brand {
    grid-column: auto;
  }
}

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 260px;
  }

  .about-stats {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
  }

  .stat-item {
    text-align: left;
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
  }
}

/* --- Utility --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}