// ============================================
// PasteApeart 官网 · 样式表（LESS）
// 设计：Indigo 主色 + Sky 辅色 / 技术文档感
// ============================================

// ---------- Variables ----------
@color-primary: #4f46e5;
@color-primary-light: #6366f1;
@color-primary-dark: #4338ca;
@color-handler: #0ea5e9;
@color-handler-dark: #0369a1;

@color-bg: #ffffff;
@color-bg-alt: #f5f7fa;
@color-surface: #ffffff;

@color-text-primary: #0f172a;
@color-text-secondary: #475569;
@color-text-tertiary: #64748b;

@color-border: rgba(15, 23, 42, 0.08);
@color-success: #22c55e;
@color-danger: #ef4444;

@radius-sm: 6px;
@radius-md: 10px;
@radius-lg: 14px;
@radius-xl: 20px;

@shadow-sm: 0 1px 2px -1px rgba(15, 23, 42, 0.08), 0 1px 3px -1px rgba(15, 23, 42, 0.1);
@shadow-md: 0 10px 30px -10px rgba(15, 23, 42, 0.15);
@shadow-lg: 0 40px 80px -30px rgba(79, 70, 229, 0.25);

@container-width: 1200px;
@nav-height: 72px;
@transition-base: all 0.25s ease;

// ---------- Mixins ----------
.flex-center() {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between() {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-base() {
  background: @color-surface;
  border: 1px solid @color-border;
  border-radius: @radius-lg;
  box-shadow: @shadow-sm;
  transition: @transition-base;

  &:hover {
    transform: translateY(-4px);
    box-shadow: @shadow-md;
    border-color: rgba(79, 70, 229, 0.15);
  }
}

.icon-gradient(@from: #818cf8, @to: @color-primary) {
  background: radial-gradient(120% 120% at 50% 0%, @from 0%, @to 70%);
}

// ---------- Base ----------
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: @nav-height + 8px;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Noto Sans SC", sans-serif;
  color: @color-text-primary;
  background: @color-bg;
  line-height: 1.8;
  overflow-x: hidden;
}

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

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

code {
  font-family: "JetBrains Mono", Consolas, "SFMono-Regular", monospace;
  background: rgba(15, 23, 42, 0.06);
  padding: 2px 6px;
  border-radius: @radius-sm;
  font-size: 0.95em;
  word-break: break-word;
}

.container {
  // 注意：必须用 ~"" 转义，否则 LESS 会把 min() 里的 `100% - 40px` 当成算术计算成 60%
  width: min(@container-width, ~"calc(100% - 40px)");
  margin: 0 auto;
}

// ---------- Header ----------
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  backdrop-filter: saturate(140%) blur(10px);
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid transparent;
  transition: @transition-base;

  &.scrolled {
    border-bottom-color: @color-border;
    background: rgba(255, 255, 255, 0.94);
    box-shadow: 0 1px 0 rgba(15, 23, 42, 0.04);
  }
}

.nav-inner {
  .flex-between();
  height: @nav-height;
  gap: 24px;
}

.logo {
  .flex-center();
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.01em;
  flex-shrink: 0;
}

.logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  .icon-gradient();
  color: #fff;
  .flex-center();
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35), 0 10px 40px -20px @color-primary;

  span {
    font-size: 18px;
    line-height: 1;
  }
}

.logo-text {
  font-size: 18px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 22px);

  a {
    color: @color-text-secondary;
    font-size: 14.5px;
    font-weight: 500;
    padding: 8px 2px;
    position: relative;
    transition: @transition-base;
    white-space: nowrap;

    &::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 4px;
      width: 100%;
      height: 2px;
      border-radius: 2px;
      background: linear-gradient(90deg, transparent, @color-primary, transparent);
      transform: scaleX(0);
      opacity: 0.8;
      transition: @transition-base;
    }

    &:hover,
    &.active {
      color: @color-text-primary;

      &::after {
        transform: scaleX(1);
      }
    }
  }

  @media (max-width: 1080px) {
    position: absolute;
    top: @nav-height;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid @color-border;
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 20px 20px;
    gap: 4px;
    transform: translateY(-10px);
    opacity: 0;
    pointer-events: none;
    transition: @transition-base;
    box-shadow: 0 20px 60px -30px rgba(15, 23, 42, 0.4);
    max-height: calc(100vh - @nav-height);
    overflow-y: auto;

    &.active {
      transform: translateY(0);
      opacity: 1;
      pointer-events: auto;
    }

    a {
      width: 100%;
      padding: 10px 6px;
      font-size: 15px;
    }
  }
}

.nav-actions {
  .flex-center();
  gap: 10px;
  flex-shrink: 0;

  // 窄屏优先保证 logo 与汉堡按钮完整可见，避免横向溢出
  @media (max-width: 768px) {
    .btn-ghost {
      display: none;
    }
  }

  @media (max-width: 420px) {
    .btn {
      padding: 0 12px;
      font-size: 13.5px;
    }
  }
}

.nav-toggle {
  display: none;
  border: 1px solid @color-border;
  background: @color-surface;
  width: 40px;
  height: 40px;
  border-radius: @radius-md;
  .flex-center();
  cursor: pointer;
  color: @color-text-primary;
  font-size: 18px;

  @media (max-width: 1080px) {
    display: flex;
  }
}

// ---------- Buttons ----------
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 40px;
  padding: 0 18px;
  border-radius: @radius-md;
  font-weight: 600;
  font-size: 14.5px;
  border: 1px solid transparent;
  transition: @transition-base;
  white-space: nowrap;
  cursor: pointer;
  font-family: inherit;

  i {
    font-size: 1.05em;
  }

  &:active {
    transform: scale(0.995);
  }
}

.btn-lg {
  height: 48px;
  padding: 0 22px;
  font-size: 15px;
  border-radius: @radius-lg;
}

.btn-primary {
  color: #fff;
  .icon-gradient();
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35), 0 10px 40px -20px @color-primary;

  &:hover {
    filter: brightness(1.03);
    transform: translateY(-1px);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4), 0 14px 50px -20px @color-primary;
  }
}

.btn-ghost {
  color: @color-text-primary;
  background: rgba(255, 255, 255, 0.92);
  border-color: @color-border;
  backdrop-filter: blur(6px);

  &:hover {
    background: #fff;
    transform: translateY(-1px);
  }
}

.btn-white {
  color: @color-primary;
  background: #fff;

  &:hover {
    transform: translateY(-1px);
    box-shadow: 0 14px 50px -20px rgba(255, 255, 255, 0.6);
  }
}

// ---------- Hero ----------
.hero {
  padding: clamp(96px, 12vw, 160px) 0 clamp(48px, 6vw, 88px);
  background:
    radial-gradient(1200px 800px at 50% 0%, rgba(99, 102, 241, 0.08) 0%, rgba(255, 255, 255, 0) 70%),
    radial-gradient(800px 600px at 80% 10%, rgba(14, 165, 233, 0.06) 0%, rgba(255, 255, 255, 0) 70%),
    linear-gradient(180deg, #ffffff 0%, #fbfbff 60%, #ffffff 100%);
  overflow: clip;
}

.hero-inner {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  align-items: center;
  gap: clamp(40px, 6vw, 80px);

  @media (max-width: 992px) {
    grid-template-columns: 1fr;
  }
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: clamp(20px, 3vw, 28px);

  @media (max-width: 992px) {
    align-items: center;
    text-align: center;
  }
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 32px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: @color-primary;
  background: rgba(79, 70, 229, 0.08);
  border: 1px solid rgba(79, 70, 229, 0.15);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.5);

  .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: @color-primary;
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.15);
  }
}

.hero-title {
  font-size: clamp(34px, 5.2vw, 58px);
  line-height: 1.12;
  letter-spacing: -0.04em;
  font-weight: 800;
}

.gradient {
  background: linear-gradient(90deg, #4f46e5 0%, #818cf8 40%, #0ea5e9 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-subtitle {
  color: @color-text-secondary;
  font-size: clamp(15.5px, 2.2vw, 18px);
  max-width: 660px;
  line-height: 1.95;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;

  @media (max-width: 992px) {
    justify-content: center;
  }
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;

  @media (max-width: 992px) {
    justify-content: center;
  }
}

.tag {
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  font-size: 12.5px;
  color: @color-text-secondary;
  background: rgba(15, 23, 42, 0.04);
  border: 1px solid @color-border;
}

// ---------- Hero Visual ----------
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.mockup {
  position: relative;
  width: min(100%, 580px);
  background: @color-surface;
  border: 1px solid @color-border;
  border-radius: @radius-xl;
  box-shadow: @shadow-lg;
  overflow: hidden;
  transform: perspective(1200px) rotateY(-5deg);
  transition: @transition-base;

  &:hover {
    transform: perspective(1200px) rotateY(-3deg) translateY(-4px);
  }

  @media (max-width: 992px) {
    transform: none;

    &:hover {
      transform: translateY(-2px);
    }
  }
}

.mockup-header {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 44px;
  padding: 0 16px;
  background: linear-gradient(180deg, #ffffff 0%, #f8f9ff 100%);
  border-bottom: 1px solid @color-border;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;

  &.red {
    background: #ff5f56;
  }
  &.yellow {
    background: #ffbd2e;
  }
  &.green {
    background: #27c93f;
  }
}

.mockup-title {
  margin-left: 8px;
  font-size: 12px;
  color: @color-text-tertiary;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mockup-body {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: clamp(14px, 2vw, 18px);
  background:
    radial-gradient(600px 400px at 50% 0%, rgba(99, 102, 241, 0.04) 0%, rgba(255, 255, 255, 0) 70%),
    #ffffff;
}

.pillars-preview {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.pillar-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: @radius-md;
  font-size: 12.5px;
  font-weight: 600;
  border: 1px solid @color-border;
  background: #f8f9ff;
  color: @color-primary;

  &.handler {
    color: @color-handler-dark;
    background: rgba(14, 165, 233, 0.08);
    border-color: rgba(14, 165, 233, 0.25);
  }

  .pillar-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
    flex-shrink: 0;
  }
}

.hosts-preview {
  padding: 10px;
  border: 1px dashed @color-border;
  border-radius: @radius-lg;
  background: rgba(255, 255, 255, 0.96);
}

.hosts-label {
  font-size: 11.5px;
  font-weight: 600;
  color: @color-text-tertiary;
  margin-bottom: 8px;
}

.hosts-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.host-chip {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  color: @color-handler-dark;
  background: rgba(14, 165, 233, 0.1);
  border: 1px solid rgba(14, 165, 233, 0.25);
}

.arch-preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 12px 10px;
  border: 1px dashed @color-border;
  border-radius: @radius-lg;
  background: rgba(255, 255, 255, 0.96);
}

.arch-layer {
  width: 100%;
  min-height: 32px;
  padding: 6px 10px;
  border-radius: 8px;
  .flex-center();
  font-size: 11.5px;
  font-weight: 600;
  text-align: center;
  border: 1px solid @color-border;
  background: #f8f9ff;

  &.handler {
    color: @color-handler-dark;
    background: rgba(14, 165, 233, 0.08);
    border-color: rgba(14, 165, 233, 0.25);
  }
}

.arch-line {
  width: 1px;
  height: 8px;
  background: rgba(15, 23, 42, 0.18);
}

.glow {
  position: absolute;
  inset: -20% -10% -10% -10%;
  background: radial-gradient(600px 400px at 50% 20%, rgba(99, 102, 241, 0.18) 0%, rgba(99, 102, 241, 0) 70%);
  filter: blur(40px);
  pointer-events: none;
  z-index: -1;
}

// ---------- Sections ----------
.section {
  padding: clamp(64px, 8vw, 120px) 0;
}

.section-alt {
  background: @color-bg-alt;
}

.section-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: clamp(12px, 2vw, 18px);
  margin-bottom: clamp(40px, 6vw, 64px);

  h2 {
    font-size: clamp(28px, 4.6vw, 44px);
    line-height: 1.14;
    letter-spacing: -0.04em;
    font-weight: 800;
  }

  p {
    color: @color-text-secondary;
    max-width: 840px;
    font-size: clamp(15px, 2.2vw, 17.5px);
    line-height: 1.95;
  }
}

// ---------- Grid ----------
// 栅格子项的自动最小尺寸是 min-content，若不给 min-width:0，
// 中英混排或代码片段中的长串会把 1fr 轨道撑破，导致窄屏出现横向滚动。
.grid > *,
.pillars-grid > *,
.evolution-grid > *,
.compare > *,
.hosts-grid > *,
.attrs-grid > *,
.event-flow > *,
.steps > *,
.usecases > *,
.ecosystem-grid > *,
.arch-row > *,
.hero-inner > *,
.footer-inner > *,
.footer-links > * {
  min-width: 0;
}

// 兜底：超长不可断词（英文标识、路径、代码）允许在必要时断行
.card,
.compare-item,
.evo-card,
.pillar-card,
.host-card,
.attr-item,
.flow-step,
.step,
.usecase,
.eco-card,
.arch-node,
.footer-col {
  overflow-wrap: break-word;
}

.grid {
  display: grid;
  gap: clamp(18px, 2.5vw, 24px);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);

  @media (max-width: 992px) {
    grid-template-columns: repeat(2, 1fr);
  }
  @media (max-width: 640px) {
    grid-template-columns: 1fr;
  }
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);

  @media (max-width: 1080px) {
    grid-template-columns: repeat(2, 1fr);
  }
  @media (max-width: 640px) {
    grid-template-columns: 1fr;
  }
}

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

  @media (max-width: 768px) {
    grid-template-columns: 1fr;
  }
}

// ---------- Card ----------
.card {
  .card-base();
  display: flex;
  flex-direction: column;
  gap: clamp(10px, 2vw, 14px);
  padding: clamp(20px, 2.5vw, 28px);

  h3 {
    font-size: clamp(17px, 2vw, 20px);
    letter-spacing: -0.02em;
    line-height: 1.25;
  }

  p {
    color: @color-text-secondary;
    line-height: 1.95;
  }

  &.highlight {
    border-color: rgba(79, 70, 229, 0.25);
    box-shadow: 0 20px 60px -30px rgba(79, 70, 229, 0.35);
  }
}

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  .flex-center();
  color: #fff;
  .icon-gradient();
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4), 0 10px 40px -20px @color-primary;
  flex-shrink: 0;

  i {
    font-size: 20px;
  }

  &.handler {
    .icon-gradient(#38bdf8, @color-handler);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4), 0 10px 40px -20px @color-handler;
  }
}

.feature-card {
  min-height: 230px;
}

// ---------- Pillars ----------
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(20px, 3vw, 28px);

  @media (max-width: 880px) {
    grid-template-columns: 1fr;
  }
}

.pillar-card {
  gap: clamp(16px, 2vw, 20px);
  padding: clamp(24px, 3vw, 32px);

  &.dto {
    background:
      radial-gradient(600px 400px at 50% 0%, rgba(99, 102, 241, 0.05) 0%, rgba(255, 255, 255, 0) 70%),
      #ffffff;
  }

  &.handler {
    background:
      radial-gradient(600px 400px at 50% 0%, rgba(14, 165, 233, 0.05) 0%, rgba(255, 255, 255, 0) 70%),
      #ffffff;
    border-color: rgba(14, 165, 233, 0.25);
  }
}

.pillar-header {
  display: flex;
  align-items: flex-start;
  gap: clamp(14px, 2vw, 16px);
}

.pillar-title {
  display: flex;
  flex-direction: column;
  gap: 6px;

  h3 {
    font-size: clamp(20px, 2.4vw, 24px);
    letter-spacing: -0.02em;
  }
}

.pillar-tag {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  height: 26px;
  padding: 0 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  color: @color-primary;
  background: rgba(79, 70, 229, 0.1);
  border: 1px solid rgba(79, 70, 229, 0.25);

  &.handler {
    color: @color-handler-dark;
    background: rgba(14, 165, 233, 0.1);
    border-color: rgba(14, 165, 233, 0.3);
  }
}

.pillar-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  list-style: none;
  color: @color-text-secondary;

  li {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    line-height: 1.95;

    i {
      color: @color-success;
      margin-top: 5px;
      flex-shrink: 0;
    }
  }
}

// ---------- Evolution ----------
.evolution-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: stretch;
  gap: clamp(16px, 3vw, 24px);

  @media (max-width: 880px) {
    grid-template-columns: 1fr;
  }
}

.evo-card {
  .card-base();
  display: flex;
  flex-direction: column;
  gap: clamp(12px, 2vw, 16px);
  padding: clamp(20px, 3vw, 28px);

  h3 {
    font-size: clamp(18px, 2vw, 21px);
    letter-spacing: -0.02em;
  }

  p {
    color: @color-text-secondary;
    line-height: 1.95;
  }

  &.form {
    background: linear-gradient(180deg, #ffffff 0%, #f8f9ff 100%);
  }

  &.apeart {
    background:
      radial-gradient(600px 400px at 50% 0%, rgba(14, 165, 233, 0.06) 0%, rgba(255, 255, 255, 0) 70%),
      #ffffff;
    border-color: rgba(14, 165, 233, 0.3);
    box-shadow: 0 20px 60px -30px rgba(14, 165, 233, 0.35);
  }
}

.evo-badge {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 700;
  color: @color-primary;
  background: rgba(79, 70, 229, 0.1);
  border: 1px solid rgba(79, 70, 229, 0.25);

  &.apeart {
    color: @color-handler-dark;
    background: rgba(14, 165, 233, 0.12);
    border-color: rgba(14, 165, 233, 0.35);
  }
}

.evo-focus {
  margin-top: auto;
  font-size: 13.5px;
  color: @color-text-tertiary;
  padding: 8px 10px;
  border-radius: @radius-md;
  background: rgba(15, 23, 42, 0.04);
  border: 1px solid @color-border;
}

.evo-arrow {
  .flex-center();
  color: @color-text-tertiary;
  font-size: 26px;

  @media (max-width: 880px) {
    transform: rotate(90deg);
  }
}

// ---------- Compare ----------
.compare {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: stretch;
  gap: clamp(16px, 3vw, 24px);

  @media (max-width: 880px) {
    grid-template-columns: 1fr;
  }
}

.compare-item {
  .card-base();
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2vw, 18px);
  padding: clamp(20px, 3vw, 28px);
  background: #fff;

  h3 {
    font-size: clamp(18px, 2vw, 20px);
    letter-spacing: -0.02em;
  }

  ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
    list-style: none;
    color: @color-text-secondary;

    li {
      padding-left: 20px;
      position: relative;
      line-height: 1.95;

      &::before {
        content: "";
        position: absolute;
        left: 0;
        top: 11px;
        width: 6px;
        height: 6px;
        border-radius: 50%;
        background: rgba(15, 23, 42, 0.25);
      }
    }
  }

  &.highlight {
    border-color: rgba(79, 70, 229, 0.25);
    box-shadow: 0 20px 60px -30px rgba(79, 70, 229, 0.4);
    background:
      radial-gradient(600px 400px at 50% 0%, rgba(99, 102, 241, 0.06) 0%, rgba(255, 255, 255, 0) 70%),
      #ffffff;

    h3 {
      color: @color-primary;
    }

    li::before {
      background: @color-primary;
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }
  }
}

.compare-arrow {
  .flex-center();
  color: @color-primary;
  font-size: 28px;

  @media (max-width: 880px) {
    transform: rotate(90deg);
  }
}

// ---------- Architecture ----------
.arch-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(32px, 5vw, 48px);
}

.arch-flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(12px, 2vw, 16px);
  width: min(100%, 780px);
}

.arch-node {
  width: 100%;
  .card-base();
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: clamp(6px, 1.5vw, 8px);
  padding: clamp(18px, 2.5vw, 24px);

  &.handler {
    background:
      radial-gradient(600px 400px at 50% 0%, rgba(14, 165, 233, 0.08) 0%, rgba(255, 255, 255, 0) 70%),
      #ffffff;
    border-color: rgba(14, 165, 233, 0.3);
  }
}

.arch-title {
  font-weight: 700;
  font-size: clamp(16px, 2vw, 18px);
  letter-spacing: -0.02em;
}

.arch-desc {
  color: @color-text-primary;
  max-width: 620px;
  font-weight: 500;
}

.arch-sub {
  color: @color-text-secondary;
  font-size: 14px;
}

.arch-arrow {
  color: @color-text-tertiary;
  font-size: 24px;
}

.arch-note {
  margin-top: 4px;
  font-size: 13.5px;
  color: @color-text-tertiary;
  text-align: center;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.04);
  border: 1px solid @color-border;
}

.arch-table {
  width: 100%;
  border: 1px solid @color-border;
  border-radius: @radius-lg;
  overflow: hidden;
  box-shadow: @shadow-sm;
  background: #fff;
}

.arch-row {
  display: grid;
  grid-template-columns: 1.1fr repeat(3, 1.8fr);
  border-bottom: 1px solid @color-border;

  &:last-child {
    border-bottom: none;
  }

  &.head {
    background: #f8f9ff;
    font-weight: 700;
    font-size: 13.5px;
    color: @color-text-tertiary;
  }

  > div {
    padding: clamp(10px, 2vw, 14px) clamp(12px, 2vw, 16px);
    border-right: 1px solid @color-border;
    line-height: 1.9;

    &:last-child {
      border-right: none;
    }
  }

  @media (max-width: 880px) {
    grid-template-columns: 1fr;

    > div {
      border-right: none;
      border-bottom: 1px solid @color-border;

      &:last-child {
        border-bottom: none;
      }
    }

    &.head {
      display: none;
    }
  }
}

// ---------- Multi-host ----------
.hosts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(16px, 2.5vw, 22px);

  @media (max-width: 992px) {
    grid-template-columns: repeat(2, 1fr);
  }
  @media (max-width: 560px) {
    grid-template-columns: 1fr;
  }
}

.host-card {
  .card-base();
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  padding: clamp(18px, 2.5vw, 24px);
  background:
    radial-gradient(500px 300px at 50% 0%, rgba(14, 165, 233, 0.05) 0%, rgba(255, 255, 255, 0) 70%),
    #ffffff;

  &:hover {
    border-color: rgba(14, 165, 233, 0.3);
  }
}

.host-icon {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  .flex-center();
  color: #fff;
  .icon-gradient(#38bdf8, @color-handler);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4), 0 10px 40px -20px @color-handler;

  i {
    font-size: 19px;
  }
}

.host-name {
  font-size: clamp(16px, 2vw, 18px);
  font-weight: 700;
  letter-spacing: -0.01em;
  font-family: "JetBrains Mono", monospace;
  color: @color-handler-dark;
}

.host-desc {
  color: @color-text-secondary;
  font-size: 14.5px;
  line-height: 1.9;
}

.hosts-quote {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  max-width: 860px;
  margin: clamp(28px, 4vw, 40px) auto 0;
  padding: clamp(16px, 2.5vw, 22px) clamp(18px, 3vw, 26px);
  border-radius: @radius-lg;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid @color-border;
  box-shadow: @shadow-sm;

  i {
    font-size: 22px;
    color: @color-handler;
    opacity: 0.6;
    line-height: 1.4;
  }

  p {
    color: @color-text-secondary;
    font-size: clamp(14.5px, 2vw, 16.5px);
    line-height: 1.9;
  }
}

// ---------- Attributes ----------
.attr-toolbar {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: clamp(24px, 3.5vw, 34px);
  flex-wrap: wrap;
}

.attr-search {
  position: relative;
  display: flex;
  align-items: center;
  flex: 1;
  min-width: 240px;
  max-width: 460px;
  height: 44px;
  padding: 0 12px;
  gap: 8px;
  border-radius: @radius-md;
  background: #fff;
  border: 1px solid @color-border;
  box-shadow: @shadow-sm;
  transition: @transition-base;

  &:focus-within {
    border-color: rgba(79, 70, 229, 0.4);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.08);
  }

  > i {
    color: @color-text-tertiary;
    font-size: 15px;
    flex-shrink: 0;
  }

  input {
    flex: 1;
    min-width: 0;
    border: none;
    outline: none;
    background: transparent;
    font-family: inherit;
    font-size: 14.5px;
    color: @color-text-primary;

    &::placeholder {
      color: @color-text-tertiary;
    }
  }
}

.attr-clear {
  border: none;
  background: transparent;
  color: @color-text-tertiary;
  cursor: pointer;
  font-size: 13px;
  padding: 4px;
  border-radius: @radius-sm;
  display: none;
  transition: @transition-base;

  &:hover {
    color: @color-text-primary;
    background: rgba(15, 23, 42, 0.06);
  }

  &.show {
    display: inline-flex;
  }
}

.attr-count {
  font-size: 13.5px;
  color: @color-text-tertiary;

  span {
    font-weight: 700;
    color: @color-primary;
  }
}

.attr-group {
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2vw, 18px);
  margin-bottom: clamp(26px, 3.5vw, 38px);

  &[hidden] {
    display: none;
  }
}

.attr-group-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: clamp(16px, 2vw, 18px);
  font-weight: 700;
  letter-spacing: -0.01em;

  i {
    color: @color-primary;
  }
}

.attrs-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(10px, 1.8vw, 14px);

  @media (max-width: 1080px) {
    grid-template-columns: repeat(3, 1fr);
  }
  @media (max-width: 780px) {
    grid-template-columns: repeat(2, 1fr);
  }
  @media (max-width: 480px) {
    grid-template-columns: 1fr;
  }
}

.attr-item {
  .card-base();
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: clamp(12px, 2vw, 15px);

  &[hidden] {
    display: none;
  }
}

.attr-name {
  font-weight: 700;
  font-family: "JetBrains Mono", monospace;
  font-size: 13.5px;
  letter-spacing: -0.01em;
  color: @color-primary-dark;
}

.attr-desc {
  color: @color-text-secondary;
  font-size: 13.8px;
  line-height: 1.85;
}

.attr-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: clamp(32px, 5vw, 56px) 0;
  color: @color-text-tertiary;

  &[hidden] {
    display: none;
  }

  i {
    font-size: 28px;
    opacity: 0.5;
  }

  p {
    font-size: 15px;
  }
}

.attr-more {
  text-align: center;
  color: @color-text-secondary;

  a {
    color: @color-primary;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;

    &:hover {
      text-decoration: underline;
    }
  }
}

// ---------- Event Model ----------
.event-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  align-items: stretch;
  gap: clamp(10px, 1.8vw, 14px);
  margin-top: clamp(28px, 4vw, 40px);

  @media (max-width: 992px) {
    grid-template-columns: 1fr;
  }
}

.flow-step {
  .card-base();
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 8px;
  padding: clamp(18px, 2.5vw, 24px) clamp(14px, 2vw, 20px);
}

.flow-num {
  width: 36px;
  height: 36px;
  border-radius: 999px;
  .flex-center();
  font-weight: 800;
  font-size: 15px;
  color: #fff;
  .icon-gradient();
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4), 0 10px 40px -20px @color-primary;
}

.flow-title {
  font-weight: 700;
  font-size: 15.5px;
  letter-spacing: -0.01em;
}

.flow-desc {
  color: @color-text-secondary;
  font-size: 13.5px;
  line-height: 1.8;
}

.flow-arrow {
  .flex-center();
  color: @color-text-tertiary;
  font-size: 20px;

  @media (max-width: 992px) {
    transform: rotate(90deg);
  }
}

// ---------- Code Block ----------
.code-block {
  margin-top: clamp(28px, 4vw, 40px);
  border: 1px solid @color-border;
  border-radius: @radius-xl;
  box-shadow: @shadow-sm;
  overflow: hidden;
  background: #0f172a;
}

.code-header {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 44px;
  padding: 0 16px;
  background: linear-gradient(180deg, #0f172a 0%, #0b1226 100%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);

  .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
  }
}

.code-title {
  margin-left: 8px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.65);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.code-copy {
  margin-left: auto;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.72);
  width: 30px;
  height: 30px;
  border-radius: @radius-sm;
  .flex-center();
  cursor: pointer;
  font-size: 13px;
  flex-shrink: 0;
  transition: @transition-base;

  &:hover {
    background: rgba(255, 255, 255, 0.14);
    color: #fff;
  }

  &.copied {
    color: #4ade80;
    border-color: rgba(74, 222, 128, 0.4);
  }
}

pre {
  margin: 0;
  padding: clamp(16px, 2.5vw, 24px);
  overflow: auto;
  max-height: 440px;
  background:
    radial-gradient(800px 600px at 50% 0%, rgba(99, 102, 241, 0.15) 0%, rgba(15, 23, 42, 0) 70%),
    #0f172a;
}

code.language-csharp {
  color: #e2e8f0;
  font-size: clamp(12.5px, 1.9vw, 14px);
  line-height: 1.9;
  white-space: pre;
  display: block;
  background: transparent;
  padding: 0;
}

// ---------- Toolchain ----------
.tool-card {
  gap: clamp(14px, 2vw, 18px);
  min-height: 220px;
}

.tool-header {
  display: flex;
  flex-direction: column;
  gap: clamp(10px, 2vw, 12px);
}

.tool-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  list-style: none;
  color: @color-text-secondary;

  li {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    line-height: 1.9;

    i {
      color: @color-success;
      margin-top: 5px;
      flex-shrink: 0;
    }
  }
}

// ---------- Steps ----------
.steps {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: stretch;
  gap: clamp(12px, 2vw, 16px);

  @media (max-width: 992px) {
    grid-template-columns: 1fr;
  }
}

.step {
  .card-base();
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: clamp(10px, 2vw, 14px);
  padding: clamp(20px, 2.5vw, 28px);

  h3 {
    font-size: clamp(16px, 2vw, 18px);
    letter-spacing: -0.02em;
  }

  p {
    color: @color-text-secondary;
    line-height: 1.9;
  }
}

.step-num {
  width: 44px;
  height: 44px;
  border-radius: 999px;
  .flex-center();
  font-weight: 800;
  font-size: 17px;
  color: #fff;
  .icon-gradient();
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4), 0 10px 40px -20px @color-primary;
}

.step-arrow {
  .flex-center();
  color: @color-text-tertiary;
  font-size: 26px;

  @media (max-width: 992px) {
    transform: rotate(90deg);
  }
}

// ---------- Use Cases ----------
.usecases {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(18px, 3vw, 24px);

  @media (max-width: 880px) {
    grid-template-columns: 1fr;
  }
}

.usecase {
  .card-base();
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2vw, 18px);
  padding: clamp(20px, 3vw, 28px);

  h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: clamp(18px, 2vw, 20px);

    i {
      font-size: 22px;
    }
  }

  ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
    list-style: none;
    color: @color-text-secondary;

    li {
      padding-left: 22px;
      position: relative;
      line-height: 1.95;

      &::before {
        content: "";
        position: absolute;
        left: 0;
        top: 11px;
        width: 6px;
        height: 6px;
        border-radius: 50%;
        background: rgba(15, 23, 42, 0.25);
      }
    }
  }

  &.fit {
    h3 i {
      color: @color-success;
    }

    li::before {
      background: @color-success;
      box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.15);
    }
  }

  &.notfit {
    h3 i {
      color: @color-danger;
    }

    li::before {
      background: @color-danger;
      box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
    }
  }
}

// ---------- Ecosystem ----------
.ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(14px, 2.5vw, 18px);

  @media (max-width: 880px) {
    grid-template-columns: 1fr;
  }
}

.eco-card {
  .card-base();
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 18px);
  padding: clamp(16px, 2.5vw, 20px);

  &:hover .eco-arrow {
    transform: translateX(4px);
  }
}

.eco-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  .flex-center();
  color: #fff;
  .icon-gradient();
  flex-shrink: 0;

  i {
    font-size: 22px;
  }
}

.eco-content {
  display: flex;
  flex-direction: column;
  gap: 4px;

  h3 {
    font-size: clamp(16px, 2vw, 18px);
    letter-spacing: -0.01em;
  }

  p {
    color: @color-text-secondary;
    line-height: 1.85;
  }
}

.eco-arrow {
  margin-left: auto;
  color: @color-text-tertiary;
  font-size: 20px;
  flex-shrink: 0;
  transition: @transition-base;
}

// ---------- CTA ----------
.cta-section {
  padding-bottom: clamp(64px, 8vw, 96px);
}

.cta-inner {
  .card-base();
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: clamp(16px, 2.5vw, 22px);
  padding: clamp(28px, 5vw, 48px);
  background:
    radial-gradient(1200px 800px at 50% 0%, rgba(99, 102, 241, 0.12) 0%, rgba(255, 255, 255, 0) 70%),
    radial-gradient(800px 600px at 50% 100%, rgba(14, 165, 233, 0.08) 0%, rgba(255, 255, 255, 0) 70%),
    linear-gradient(180deg, #ffffff 0%, #f8f9ff 100%);
  border-color: rgba(79, 70, 229, 0.25);
  box-shadow: 0 40px 90px -40px rgba(79, 70, 229, 0.4);

  &:hover {
    transform: none;
  }

  h2 {
    font-size: clamp(24px, 4.2vw, 40px);
    line-height: 1.14;
    letter-spacing: -0.04em;
    font-weight: 800;
  }

  p {
    color: @color-text-secondary;
    max-width: 780px;
    font-size: clamp(15px, 2.2vw, 17.5px);
    line-height: 1.95;
  }
}

.cta-note {
  font-size: 13.5px;
  color: @color-text-tertiary;
}

// ---------- Footer ----------
.footer {
  background: #0b1226;
  color: rgba(255, 255, 255, 0.88);
  padding-top: clamp(48px, 6vw, 64px);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: clamp(32px, 6vw, 64px);
  padding-bottom: clamp(32px, 5vw, 48px);

  @media (max-width: 880px) {
    grid-template-columns: 1fr;
  }
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2vw, 18px);

  .logo {
    justify-content: flex-start;
  }

  .logo-mark {
    .icon-gradient(#a5b4fc, #818cf8);
  }

  .logo-text {
    color: #fff;
  }
}

.footer-desc {
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.95;
  max-width: 340px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(20px, 3vw, 32px);

  @media (max-width: 640px) {
    grid-template-columns: repeat(2, 1fr);
  }
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: clamp(10px, 2vw, 14px);

  h4 {
    font-size: 14.5px;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: #fff;
  }

  a {
    color: rgba(255, 255, 255, 0.72);
    width: fit-content;
    transition: @transition-base;

    &:hover {
      color: #fff;
    }
  }
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 18px 0;

  p {
    color: rgba(255, 255, 255, 0.56);
    font-size: 14px;
    text-align: center;
  }
}

// ---------- Back to Top ----------
.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 44px;
  height: 44px;
  border-radius: 999px;
  border: 1px solid @color-border;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  box-shadow: @shadow-md;
  .flex-center();
  cursor: pointer;
  font-size: 17px;
  color: @color-text-primary;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: @transition-base;
  z-index: 900;

  &.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  &:hover {
    transform: translateY(-2px);
  }
}

// ---------- Animations ----------
.fade-up {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);

  &.in {
    opacity: 1;
    transform: translateY(0);
  }
}

.delay-1 {
  transition-delay: 0.08s;
}

.delay-2 {
  transition-delay: 0.16s;
}

// ---------- Reduced Motion ----------
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .fade-up,
  .mockup,
  .card,
  .btn,
  .host-card,
  .attr-item {
    transition: none;
    transform: none;
  }

  .fade-up {
    opacity: 1;
  }
}