/* ========== 基础重置 ========== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans SC", "Microsoft YaHei", sans-serif;
  background: radial-gradient(circle at top, #151b2b 0, #05060a 55%, #000 100%);
  color: #f5f7ff;
  -webkit-font-smoothing: antialiased;
}

/* ========== 主题色 ==========
   主色：青蓝 (#00e0ff)
   辅色：电光紫 (#7c5cff)
   危险色：红 (#ff3366) */
:root {
  --xc-bg-main: #05060a;
  --xc-bg-elevated: rgba(14, 18, 32, 0.96);
  --xc-bg-elevated-soft: rgba(20, 26, 48, 0.9);
  --xc-border-subtle: rgba(255, 255, 255, 0.04);
  --xc-border-strong: rgba(0, 224, 255, 0.68);
  --xc-primary: #00e0ff;
  --xc-primary-soft: rgba(0, 224, 255, 0.1);
  --xc-primary-strong: #4dffff;
  --xc-accent: #7c5cff;
  --xc-text-main: #f5f7ff;
  --xc-text-subtle: #a0a4b8;
  --xc-danger: #ff3366;
  --xc-radius-lg: 18px;
  --xc-radius-md: 12px;
  --xc-radius-pill: 999px;
  --xc-shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.65);
  --xc-glow: 0 0 18px rgba(0, 224, 255, 0.6);
}

/* ========== 布局容器 ========== */
.xc-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(circle at top left, rgba(0, 224, 255, 0.12), transparent 55%),
    radial-gradient(circle at bottom right, rgba(124, 92, 255, 0.16), transparent 55%),
    linear-gradient(135deg, #05060a 0%, #050712 40%, #02030a 100%);
}

.xc-page-inner {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 72px 20px 40px;
}

/* ========== 顶部导航（保留原结构） ========== */
.xc-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, rgba(5, 6, 12, 0.96), rgba(5, 6, 12, 0.85));
  border-bottom: 1px solid var(--xc-border-subtle);
}

.xc-header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.xc-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.xc-logo-mark {
  width: 30px;
  height: 30px;
  border-radius: 12px;
  background: radial-gradient(circle at 30% 0, var(--xc-primary), #004b66);
  box-shadow: var(--xc-glow);
  position: relative;
}
.xc-logo-mark::after {
  content: "";
  position: absolute;
  inset: 7px;
  border-radius: inherit;
  border: 1px solid rgba(0, 0, 0, 0.65);
}

.xc-logo-text-main {
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 18px;
}
.xc-logo-text-sub {
  font-size: 11px;
  color: var(--xc-text-subtle);
}

.xc-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 14px;
}

.xc-nav a {
  color: var(--xc-text-subtle);
  text-decoration: none;
  position: relative;
  padding: 4px 0;
  transition: color 0.18s ease;
}

.xc-nav a:hover {
  color: var(--xc-text-main);
}

.xc-nav a.is-active {
  color: var(--xc-primary-strong);
}

.xc-nav a.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--xc-primary), var(--xc-accent));
}

/* 右侧登录/注册快速入口 */
.xc-nav-auth {
  display: flex;
  align-items: center;
  gap: 8px;
}

.xc-nav-auth .xc-btn {
  font-size: 13px;
  padding: 6px 14px;
}

/* ========== 通用按钮 ========== */
.xc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 22px;
  border-radius: var(--xc-radius-pill);
  border: 1px solid transparent;
  font-size: 14px;
  color: var(--xc-text-main);
  text-decoration: none;
  cursor: pointer;
  background: transparent;
  transition: all 0.18s ease;
  white-space: nowrap;
}

.xc-btn-primary {
  background: linear-gradient(135deg, #00e0ff, #7c5cff);
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.45), var(--xc-glow);
}
.xc-btn-primary:hover {
  filter: brightness(1.06);
  transform: translateY(-1px);
}

.xc-btn-outline {
  border-color: rgba(255, 255, 255, 0.16);
  background: radial-gradient(circle at top, rgba(255, 255, 255, 0.05), transparent 60%);
  color: var(--xc-text-main);
}
.xc-btn-outline:hover {
  border-color: var(--xc-primary);
  box-shadow: 0 0 0 1px rgba(0, 224, 255, 0.22);
  transform: translateY(-1px);
}

.xc-link-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--xc-primary-strong);
  text-decoration: none;
}
.xc-link-button::after {
  content: "›";
  font-size: 13px;
}
.xc-link-button:hover {
  text-decoration: underline;
}

/* 页面内登录/注册按钮区 */
.xc-auth-actions {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}
.xc-auth-text {
  font-size: 13px;
  color: var(--xc-text-subtle);
}

/* ========== Hero & Section 通用 ==========
   用 xc-section / xc-hero / xc-section-header 等类名保持统一前缀 */
.xc-hero {
  padding: 42px 0 32px;
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1.2fr);
  gap: 40px;
  align-items: center;
}

.xc-hero-main-kicker {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--xc-primary-strong);
  margin-bottom: 10px;
}

.xc-hero-title {
  font-size: 32px;
  line-height: 1.24;
  margin: 0 0 10px;
}
.xc-hero-subtitle {
  font-size: 14px;
  color: var(--xc-text-subtle);
  max-width: 460px;
}

.xc-hero-actions {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.xc-hero-panel {
  border-radius: var(--xc-radius-lg);
  background:
    linear-gradient(135deg, rgba(0, 224, 255, 0.1), rgba(124, 92, 255, 0.02)),
    radial-gradient(circle at top right, rgba(0, 224, 255, 0.3), transparent 55%);
  border: 1px solid rgba(0, 224, 255, 0.35);
  padding: 18px 18px 16px;
  box-shadow: var(--xc-shadow-soft);
  position: relative;
}
.xc-hero-panel-title {
  font-size: 13px;
  color: var(--xc-text-subtle);
  margin-bottom: 6px;
}
.xc-hero-panel-highlight {
  font-size: 22px;
  font-weight: 600;
}
.xc-hero-panel-meta {
  margin-top: 10px;
  font-size: 12px;
  color: var(--xc-text-subtle);
  display: flex;
  justify-content: space-between;
}
.xc-hero-panel-meta strong {
  color: var(--xc-primary-strong);
}

/* 通用 Section */
.xc-section {
  margin: 32px 0 20px;
}

.xc-section-header {
  margin-bottom: 16px;
}

.xc-page-kicker {
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--xc-primary-strong);
  margin-bottom: 4px;
}
.xc-section-header h2 {
  margin: 0 0 6px;
  font-size: 22px;
}
.xc-section-header > p {
  margin: 0;
  font-size: 14px;
  color: var(--xc-text-subtle);
}

/* 通用卡片/网格 */
.xc-grid-3 {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.xc-card,
.xc-feature-card,
.xc-plugin-card,
.xc-server-card {
  border-radius: var(--xc-radius-md);
  background: var(--xc-bg-elevated-soft);
  border: 1px solid var(--xc-border-subtle);
  padding: 16px 16px 14px;
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.65);
}
.xc-card h3,
.xc-feature-card h3,
.xc-plugin-card h3 {
  margin: 0 0 6px;
  font-size: 16px;
}
.xc-card p,
.xc-feature-card p,
.xc-plugin-card p {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--xc-text-subtle);
}

/* 列表、标签 */
.xc-tag {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 2px 9px;
  font-size: 11px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--xc-text-subtle);
}

/* Steps */
.xc-steps-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 10px;
}

.xc-step-card {
  border-radius: var(--xc-radius-md);
  background: var(--xc-bg-elevated-soft);
  border: 1px solid var(--xc-border-subtle);
  padding: 14px 14px 12px;
}
.xc-step-number {
  width: 28px;
  height: 28px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--xc-primary), var(--xc-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 8px;
}
.xc-step-card h4 {
  margin: 0 0 4px;
  font-size: 14px;
}
.xc-step-card p {
  margin: 0;
  font-size: 13px;
  color: var(--xc-text-subtle);
}

/* 单行代码 */
.xc-mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
  font-size: 12px;
  padding: 1px 4px;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* ========== 表单（登录/注册） ========== */
.xc-auth-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.2fr);
  gap: 40px;
  padding: 32px 0 20px;
}

.xc-auth-panel {
  border-radius: var(--xc-radius-lg);
  background: var(--xc-bg-elevated-soft);
  border: 1px solid var(--xc-border-subtle);
  padding: 20px 18px 16px;
  box-shadow: var(--xc-shadow-soft);
}

.xc-auth-panel h1 {
  font-size: 22px;
  margin: 0 0 6px;
}
.xc-auth-panel p {
  margin: 0 0 14px;
  font-size: 13px;
  color: var(--xc-text-subtle);
}

.xc-form-group {
  margin-bottom: 12px;
}
.xc-form-group label {
  display: block;
  font-size: 13px;
  margin-bottom: 4px;
}
.xc-input {
  width: 100%;
  padding: 8px 10px;
  border-radius: 8px;
  background: #050713;
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--xc-text-main);
  font-size: 13px;
}
.xc-input:focus {
  border-color: var(--xc-primary);
  outline: none;
  box-shadow: 0 0 0 1px rgba(0, 224, 255, 0.35);
}

.xc-form-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 8px;
  font-size: 12px;
  color: var(--xc-text-subtle);
}

/* ========== 页脚 ========== */
.xc-footer {
  border-top: 1px solid var(--xc-border-subtle);
  margin-top: auto;
}
.xc-footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 18px 20px 24px;
  font-size: 12px;
  color: var(--xc-text-subtle);
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: 18px;
}
.xc-footer-brand h3 {
  margin: 0 0 6px;
  font-size: 14px;
}
.xc-footer-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px 24px;
}
.xc-footer-links h4 {
  font-size: 12px;
  margin: 0 0 6px;
}
.xc-footer-links a {
  display: block;
  font-size: 12px;
  color: var(--xc-text-subtle);
  text-decoration: none;
  margin-bottom: 2px;
}
.xc-footer-links a:hover {
  color: var(--xc-primary-strong);
}

/* ========== 响应式 ========== */
@media (max-width: 900px) {
  .xc-hero,
  .xc-auth-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .xc-hero {
    padding-top: 28px;
  }

  .xc-grid-3,
  .xc-steps-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .xc-footer-inner {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  .xc-header-inner {
    flex-wrap: wrap;
    gap: 10px;
  }
  .xc-nav {
    flex-wrap: wrap;
    justify-content: flex-end;
  }
}