/* ============ CSS 变量 ============ */
:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-card: #1c2129;
  --bg-card-hover: #222830;
  --border: #30363d;
  --border-light: #3d444d;

  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;

  --accent: #4ade80;
  --accent-hover: #22c55e;
  --accent-glow: rgba(74, 222, 128, 0.4);

  --orange: #fb923c;
  --red: #f87171;
  --blue: #60a5fa;
  --purple: #c084fc;
  --yellow: #fbbf24;

  --gradient-green: linear-gradient(135deg, #4ade80, #22c55e);
  --gradient-blue: linear-gradient(135deg, #60a5fa, #3b82f6);
  --gradient-purple: linear-gradient(135deg, #c084fc, #a855f7);
  --gradient-orange: linear-gradient(135deg, #fb923c, #f97316);
  --gradient-dark: linear-gradient(135deg, #1a1f2e, #0d1117);

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --glow-green: 0 0 20px rgba(74, 222, 128, 0.3);
  --glow-blue: 0 0 20px rgba(96, 165, 250, 0.3);

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Noto Sans SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}

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

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

body {
  font-family: var(--font);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

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

/* ============ 动态背景 ============ */
.bg-animation {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(74, 222, 128, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(96, 165, 250, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(192, 132, 252, 0.05) 0%, transparent 50%),
    var(--bg-primary);
}

.block {
  position: absolute;
  border-radius: 8px;
  opacity: 0.03;
  animation: float 20s ease-in-out infinite;
}

.block-1 {
  width: 300px;
  height: 300px;
  background: var(--accent);
  top: 10%;
  left: 10%;
  animation-delay: 0s;
}

.block-2 {
  width: 200px;
  height: 200px;
  background: var(--blue);
  top: 60%;
  left: 80%;
  animation-delay: -5s;
}

.block-3 {
  width: 150px;
  height: 150px;
  background: var(--purple);
  top: 80%;
  left: 20%;
  animation-delay: -10s;
}

.block-4 {
  width: 250px;
  height: 250px;
  background: var(--orange);
  top: 30%;
  left: 70%;
  animation-delay: -15s;
}

.block-5 {
  width: 100px;
  height: 100px;
  background: var(--yellow);
  top: 50%;
  left: 50%;
  animation-delay: -8s;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
  }
  25% {
    transform: translateY(-30px) rotate(5deg);
  }
  50% {
    transform: translateY(-10px) rotate(-3deg);
  }
  75% {
    transform: translateY(-40px) rotate(3deg);
  }
}

/* ============ 导航栏 ============ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
}

.logo-sc {
  font-weight: 900;
  font-size: 20px;
  letter-spacing: 1px;
  color: var(--accent);
  margin-right: 16px;
}

.logo-icon {
  font-size: 24px;
  filter: drop-shadow(0 0 8px var(--accent-glow));
}

.logo-text {
  background: var(--gradient-green);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 8px;
}

.nav-link {
  padding: 8px 16px;
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 14px;
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

/* SC资产分组（仅移动端汉堡菜单显示） */
.nav-divider {
  display: none;
  height: 1px;
  background: var(--border);
  margin: 8px 0;
}
.nav-group-title {
  display: none;
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  padding: 10px 16px 4px;
}
.nav-sub-link {
  display: none !important;
  padding-left: 28px !important;
  font-size: 13px !important;
  color: var(--text-muted) !important;
}
.nav-sub-link:hover {
  color: var(--accent) !important;
}

/* 桌面端资产下拉菜单 */
.nav-dropdown-desktop {
  position: relative;
  display: flex;
  align-items: center;
}
.nav-dropdown-trigger {
  cursor: pointer;
  display: flex;
  align-items: center;
}
.nav-dropdown-trigger::after {
  content: '';
  display: inline-block;
  margin-left: 4px;
  transition: transform 0.2s ease;
}
.nav-dropdown-menu-desktop {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  min-width: 160px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
  box-shadow: var(--shadow-lg);
  z-index: 100;
}
.nav-dropdown-menu-desktop::before {
  content: '';
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  width: 10px;
  height: 10px;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  border-top: 1px solid var(--border);
}
.nav-dropdown-desktop:hover .nav-dropdown-menu-desktop {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.nav-dropdown-menu-desktop a {
  display: block;
  padding: 10px 14px;
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
}
.nav-dropdown-menu-desktop a:hover {
  color: var(--accent);
  background: rgba(74, 222, 128, 0.1);
}

@media (max-width: 768px) {
  .nav-dropdown-desktop {
    display: none;
  }
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

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

/* ============ Hero ============ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 80px;
  position: relative;
}

.hero-content {
  text-align: center;
  max-width: 800px;
  width: 100%;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(74, 222, 128, 0.1);
  border: 1px solid rgba(74, 222, 128, 0.3);
  border-radius: 100px;
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 32px;
  animation: fadeInDown 0.8s ease-out;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 5.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 20px;
  animation: fadeInUp 0.8s ease-out 0.1s both;
}

.title-main {
  display: block;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: clamp(1.5rem, 4vw, 2rem);
  margin-bottom: 8px;
}

.title-server {
  display: block;
  background: var(--gradient-green);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 30px var(--accent-glow));
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  margin-bottom: 20px;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

/* 白名单提示 */
.whitelist-notice {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: rgba(251, 191, 36, 0.1);
  border: 1px solid rgba(251, 191, 36, 0.3);
  border-radius: 100px;
  color: var(--yellow);
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 32px;
  animation: fadeInUp 0.8s ease-out 0.25s both;
}

.whitelist-notice svg {
  flex-shrink: 0;
}

.qq-group-link {
  color: var(--yellow);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px dashed rgba(251, 191, 36, 0.5);
  transition: var(--transition);
}

.qq-group-link:hover {
  color: #fbbf24;
  border-bottom-color: var(--yellow);
}

/* IP 展示 */
.ip-display {
  margin-bottom: 40px;
  animation: fadeInUp 0.8s ease-out 0.3s both;
}

.ip-label {
  font-size: 13px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.ip-box {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 16px 24px;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  font-family: var(--font-mono);
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.ip-box:hover {
  border-color: var(--accent);
  box-shadow: var(--glow-green);
  transform: translateY(-2px);
}

.ip-text {
  color: var(--text-primary);
}

.ip-sep {
  color: var(--text-muted);
}

.ip-port {
  color: var(--accent);
}

.copy-btn {
  margin-left: 12px;
  padding: 6px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: var(--transition);
  display: flex;
  align-items: center;
}

.copy-btn:hover {
  color: var(--accent);
  background: rgba(74, 222, 128, 0.1);
}

/* Hero 按钮 */
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 15px;
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-green);
  color: #000;
  box-shadow: var(--glow-green);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--accent-glow);
}

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

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

.btn-large {
  padding: 16px 32px;
  font-size: 16px;
}

/* ============ Section 通用 ============ */
.section {
  padding: 100px 24px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

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

.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--accent);
  padding: 4px 12px;
  background: rgba(74, 222, 128, 0.1);
  border-radius: 4px;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* ============ 特色 ============ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-green);
  opacity: 0;
  transition: var(--transition);
  z-index: 0;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--glow-green);
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: rgba(74, 222, 128, 0.1);
  color: var(--accent);
  border-radius: var(--radius);
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 14px;
}

/* ============ 插件 ============ */
.plugins-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.plugin-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
}

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

.plugin-icon {
  font-size: 32px;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border-radius: var(--radius);
}

.plugin-info {
  flex: 1;
  min-width: 0;
}

.plugin-info h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.plugin-info p {
  font-size: 13px;
  color: var(--text-muted);
}

.plugin-tag {
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  background: rgba(96, 165, 250, 0.15);
  color: var(--blue);
  border-radius: 100px;
  white-space: nowrap;
  flex-shrink: 0;
}

/* ============ 加入步骤 ============ */
.join-section {
  background: var(--bg-secondary);
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

.step {
  position: relative;
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.step:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.step-number {
  position: absolute;
  top: -20px;
  left: 32px;
  width: 40px;
  height: 40px;
  background: var(--gradient-green);
  color: #000;
  font-weight: 800;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  box-shadow: var(--glow-green);
}

.step-content h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-content p {
  color: var(--text-secondary);
  font-size: 14px;
}

/* 高亮步骤 (白名单) */
.step-highlight {
  border-color: rgba(251, 191, 36, 0.4);
  background: linear-gradient(135deg, rgba(251, 191, 36, 0.05) 0%, rgba(192, 132, 252, 0.05) 100%);
}

.step-highlight .step-number {
  background: linear-gradient(135deg, #fbbf24 0%, #c084fc 100%);
  box-shadow: 0 4px 20px rgba(251, 191, 36, 0.4);
}

.qq-join-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  padding: 10px 22px;
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
  color: #000;
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  border-radius: var(--radius);
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(251, 191, 36, 0.3);
}

.qq-join-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(251, 191, 36, 0.5);
}

.inline-ip {
  font-family: var(--font-mono);
  color: var(--accent);
  font-weight: 600;
}

.join-box {
  max-width: 600px;
  margin: 0 auto;
}

.join-box-inner {
  text-align: center;
  padding: 48px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  border: 2px solid var(--accent);
  box-shadow: var(--glow-green);
}

.join-label {
  font-size: 13px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 16px;
}

.join-ip {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 1.75rem);
  font-weight: 700;
  margin-bottom: 32px;
}

.join-ip .join-sep {
  color: var(--text-muted);
  margin: 0 4px;
}

.join-ip .join-port {
  color: var(--accent);
}

/* ============ 页脚 ============ */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 64px 24px 0;
}

.footer-container {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 64px;
  padding-bottom: 48px;
}

.footer-brand p {
  color: var(--text-muted);
  margin-top: 16px;
  font-size: 14px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-col a {
  display: block;
  color: var(--text-muted);
  font-size: 14px;
  padding: 6px 0;
  transition: var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 24px;
  text-align: center;
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 13px;
}

/* ============ 动画 ============ */
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* ============ 响应式 ============ */
@media (max-width: 900px) {
  .footer-container {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-secondary);
    padding: 16px;
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-divider,
  .nav-group-title,
  .nav-sub-link {
    display: block !important;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

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

  .nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .section {
    padding: 64px 20px;
  }

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

  .hero {
    padding: 100px 20px 60px;
  }
}

@media (max-width: 480px) {
  .footer-links {
    grid-template-columns: 1fr;
  }

  .ip-box {
    padding: 14px 18px;
  }

  .btn {
    padding: 12px 22px;
    font-size: 14px;
  }
}