:root,
.dark {
  --color-bg: #24273a;
  --color-bg-alt: #1e2030;
  --color-bg-card: #363a4f;
  --color-bg-card-hover: #494d64;
  --color-surface: #363a4f;
  --color-border: #5b6078;
  --color-primary: #8aadf4;
  --color-primary-light: #b7bdf8;
  --color-primary-dark: #7dc4e4;
  --color-accent: #8bd5ca;
  --color-accent-light: #91d7e3;
  --color-success: #a6da95;
  --color-warning: #eed49f;
  --color-error: #ed8796;
  --color-text: #cad3f5;
  --color-text-muted: #a5adcb;
  --color-text-dim: #8087a2;
  --color-code-bg: #1e2030;
  --color-code-border: #363a4f;
  --syntax-keyword: #c6a0f6;
  --syntax-type: #8bd5ca;
  --syntax-property: #8aadf4;
  --syntax-variable: #eed49f;
  --syntax-string: #a6da95;
  --syntax-comment: #939ab7;
  --syntax-number: #f5a97f;
  --syntax-iri: #b7bdf8;
  --syntax-punctuation: #939ab7;
  --syntax-name: #cad3f5;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(138, 173, 244, 0.12);
  --nav-bg: rgba(36, 39, 58, 0.85);
  --color-primary-alpha-10: rgba(138, 173, 244, 0.1);
  --color-primary-alpha-15: rgba(138, 173, 244, 0.15);
  --color-primary-alpha-25: rgba(138, 173, 244, 0.25);
  --color-primary-alpha-30: rgba(138, 173, 244, 0.3);
  --color-primary-alpha-40: rgba(138, 173, 244, 0.4);
  --color-accent-alpha-10: rgba(139, 213, 202, 0.1);
  --color-success-alpha-15: rgba(166, 218, 149, 0.15);
  --color-warning-alpha-15: rgba(238, 212, 159, 0.15);
  --color-error-alpha-15: rgba(237, 135, 150, 0.15);
  --color-surface-alpha-03: rgba(255, 255, 255, 0.03);
  --color-surface-alpha-02: rgba(255, 255, 255, 0.02);
  --color-surface-alpha-05: rgba(255, 255, 255, 0.05);
  --color-surface-alpha-06: rgba(255, 255, 255, 0.06);
  --color-surface-alpha-10: rgba(255, 255, 255, 0.1);
  --hero-gradient-1: rgba(138, 173, 244, 0.08);
  --hero-gradient-2: rgba(139, 213, 202, 0.05);
  --dot-red: #ed8796;
  --dot-yellow: #eed49f;
  --dot-green: #a6da95;
  --btn-primary-text: #24273a;
  --graph-bg: #1e2030;
  --graph-concept-fill: rgba(138, 173, 244, 0.12);
  --graph-concept-stroke: #8aadf4;
  --graph-concept-text: #8aadf4;
  --graph-property-fill: rgba(198, 160, 246, 0.12);
  --graph-property-stroke: #c6a0f6;
  --graph-property-text: #c6a0f6;
  --graph-edge-subclass: #8aadf4;
  --graph-edge-has: #c6a0f6;
  --graph-edge-range: #a6da95;
  --graph-field-text: #a5adcb;
  --graph-label-text: #8087a2;
  --graph-sep-stroke: rgba(255,255,255,0.08);
  --graph-reset-bg: #363a4f;
  --graph-reset-border: #5b6078;
  --graph-reset-text: #cad3f5;
}

.light {
  --color-bg: #eff1f5;
  --color-bg-alt: #e6e9ef;
  --color-bg-card: #ccd0da;
  --color-bg-card-hover: #bcc0cc;
  --color-surface: #ccd0da;
  --color-border: #acb0be;
  --color-primary: #1e66f5;
  --color-primary-light: #7287fd;
  --color-primary-dark: #209fb5;
  --color-accent: #179299;
  --color-accent-light: #04a5e5;
  --color-success: #40a02b;
  --color-warning: #df8e1d;
  --color-error: #d20f39;
  --color-text: #4c4f69;
  --color-text-muted: #6c6f85;
  --color-text-dim: #8c8fa1;
  --color-code-bg: #e6e9ef;
  --color-code-border: #ccd0da;
  --syntax-keyword: #8839ef;
  --syntax-type: #179299;
  --syntax-property: #1e66f5;
  --syntax-variable: #df8e1d;
  --syntax-string: #40a02b;
  --syntax-comment: #7c7f93;
  --syntax-number: #fe640b;
  --syntax-iri: #7287fd;
  --syntax-punctuation: #7c7f93;
  --syntax-name: #4c4f69;
  --shadow-sm: 0 1px 3px rgba(76, 79, 105, 0.1);
  --shadow-md: 0 4px 20px rgba(76, 79, 105, 0.12);
  --shadow-lg: 0 10px 40px rgba(76, 79, 105, 0.15);
  --shadow-glow: 0 0 30px rgba(30, 102, 245, 0.08);
  --nav-bg: rgba(239, 241, 245, 0.85);
  --color-primary-alpha-10: rgba(30, 102, 245, 0.1);
  --color-primary-alpha-15: rgba(30, 102, 245, 0.15);
  --color-primary-alpha-25: rgba(30, 102, 245, 0.25);
  --color-primary-alpha-30: rgba(30, 102, 245, 0.3);
  --color-primary-alpha-40: rgba(30, 102, 245, 0.4);
  --color-accent-alpha-10: rgba(23, 146, 153, 0.1);
  --color-success-alpha-15: rgba(64, 160, 43, 0.15);
  --color-warning-alpha-15: rgba(223, 142, 29, 0.15);
  --color-error-alpha-15: rgba(210, 15, 57, 0.15);
  --color-surface-alpha-03: rgba(76, 79, 105, 0.04);
  --color-surface-alpha-02: rgba(76, 79, 105, 0.03);
  --color-surface-alpha-05: rgba(76, 79, 105, 0.06);
  --color-surface-alpha-06: rgba(76, 79, 105, 0.08);
  --color-surface-alpha-10: rgba(76, 79, 105, 0.12);
  --hero-gradient-1: rgba(30, 102, 245, 0.06);
  --hero-gradient-2: rgba(23, 146, 153, 0.04);
  --dot-red: #d20f39;
  --dot-yellow: #df8e1d;
  --dot-green: #40a02b;
  --btn-primary-text: #eff1f5;
  --graph-bg: #e6e9ef;
  --graph-concept-fill: rgba(30, 102, 245, 0.07);
  --graph-concept-stroke: #1e66f5;
  --graph-concept-text: #1e66f5;
  --graph-property-fill: rgba(114, 135, 253, 0.07);
  --graph-property-stroke: #7287fd;
  --graph-property-text: #7287fd;
  --graph-edge-subclass: #1e66f5;
  --graph-edge-has: #7287fd;
  --graph-edge-range: #40a02b;
  --graph-field-text: #6c6f85;
  --graph-label-text: #8c8fa1;
  --graph-sep-stroke: rgba(0,0,0,0.1);
  --graph-reset-bg: #ccd0da;
  --graph-reset-border: #acb0be;
  --graph-reset-text: #4c4f69;
}

:root {
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color 0.3s, color 0.3s;
}

a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover {
  color: var(--color-accent-light);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}
@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }
}

.section {
  padding: 6rem 0;
  position: relative;
}
@media (max-width: 768px) {
  .section {
    padding: 4rem 0;
  }
}
@media (max-width: 480px) {
  .section {
    padding: 3rem 0;
  }
}
.section--alt {
  background: var(--color-bg-alt);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}
.section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--color-text), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
@media (max-width: 768px) {
  .section-header h2 {
    font-size: 2rem;
  }
}
@media (max-width: 480px) {
  .section-header h2 {
    font-size: 1.7rem;
  }
}
.section-header p {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 640px;
  margin: 0 auto;
}

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 0;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: all 0.3s;
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  position: relative;
}
.nav__logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text);
}
.nav__logo .logo-icon {
  font-size: 1.8rem;
}
.nav__logo span {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}
.nav__links a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}
.nav__links a:hover {
  color: var(--color-text);
}
@media (max-width: 768px) {
  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
    padding: 0.5rem 2rem 1rem;
    z-index: 10;
  }
  .nav__links li {
    width: 100%;
    padding: 0.65rem 0;
    border-bottom: 1px solid var(--color-border);
  }
  .nav__links li:last-child {
    border-bottom: none;
  }
  .nav__links--open {
    display: flex;
  }
}
.nav__hamburger {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.3rem 0.6rem;
  line-height: 1;
  transition: background 0.2s;
}
.nav__hamburger:hover {
  background: var(--color-surface-alpha-06);
}
@media (max-width: 768px) {
  .nav__hamburger {
    display: flex;
    align-items: center;
  }
}
.nav__cta {
  background: var(--color-primary);
  color: var(--btn-primary-text) !important;
  padding: 0.5rem 1.2rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: background 0.2s, transform 0.2s;
}
.nav__cta:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-surface-alpha-06);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-text-muted);
  font-size: 1.1rem;
  transition: all 0.2s;
  line-height: 1;
}
.theme-toggle:hover {
  background: var(--color-surface-alpha-10);
  color: var(--color-text);
  border-color: var(--color-primary);
}

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 5rem;
  position: relative;
  overflow: hidden;
}
@media (max-width: 768px) {
  .hero {
    min-height: auto;
    padding-top: 5rem;
    padding-bottom: 3rem;
  }
}
.hero__bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, var(--hero-gradient-1) 0%, transparent 70%), radial-gradient(ellipse 60% 50% at 80% 20%, var(--hero-gradient-2) 0%, transparent 60%);
  pointer-events: none;
}
.hero__content {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
@media (max-width: 768px) {
  .hero__content {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}
.hero__text .badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: var(--color-primary-alpha-10);
  border: 1px solid var(--color-primary-alpha-25);
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-primary-light);
  margin-bottom: 1.5rem;
}
.hero__text h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.5rem;
}
@media (max-width: 768px) {
  .hero__text h1 {
    font-size: 2.5rem;
  }
}
@media (max-width: 480px) {
  .hero__text h1 {
    font-size: 2rem;
  }
}
.hero__text h1 .highlight {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero__text p {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  margin-bottom: 2.5rem;
  max-width: 520px;
  line-height: 1.8;
}
@media (max-width: 768px) {
  .hero__text p {
    font-size: 1.05rem;
    max-width: 100%;
  }
}
.hero__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.hero__code {
  background: var(--color-code-bg);
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}
.hero__code .code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 1.2rem;
  background: var(--color-surface-alpha-03);
  border-bottom: 1px solid var(--color-code-border);
}
.hero__code .code-header .dots {
  display: flex;
  gap: 6px;
}
.hero__code .code-header .dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-border);
}
.hero__code .code-header .dots span:nth-child(1) {
  background: var(--dot-red);
}
.hero__code .code-header .dots span:nth-child(2) {
  background: var(--dot-yellow);
}
.hero__code .code-header .dots span:nth-child(3) {
  background: var(--dot-green);
}
.hero__code .code-header .filename {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-text-dim);
}
.hero__code pre {
  padding: 1.5rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.8;
  tab-size: 2;
}
.hero__code pre code {
  color: var(--color-text-muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}
.btn--primary {
  background: var(--color-primary);
  color: var(--btn-primary-text);
  box-shadow: 0 2px 12px var(--color-primary-alpha-30);
}
.btn--primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px var(--color-primary-alpha-40);
}
.btn--secondary {
  background: var(--color-surface-alpha-06);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn--secondary:hover {
  background: var(--color-surface-alpha-10);
  border-color: var(--color-text-dim);
  transform: translateY(-2px);
}
.btn--small {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 600px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all 0.3s;
}
.feature-card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md), 0 0 20px var(--color-primary-alpha-10);
}
.feature-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  font-size: 1.5rem;
  margin-bottom: 1.2rem;
  background: var(--color-primary-alpha-10);
  color: var(--color-primary-light);
}
.feature-card__title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}
.feature-card__desc {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.playground__container {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.playground__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 1.5rem;
  background: var(--color-surface-alpha-02);
  border-bottom: 1px solid var(--color-border);
}
@media (max-width: 600px) {
  .playground__toolbar {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
}
.playground__toolbar .toolbar-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.playground__toolbar .toolbar-left .toolbar-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.playground__toolbar .toolbar-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.playground__editors {
  display: grid;
  grid-template-columns: 1fr 1fr;
  height: 520px;
}
@media (max-width: 768px) {
  .playground__editors {
    grid-template-columns: 1fr;
    height: auto;
  }
}
.playground__pane {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}
@media (max-width: 768px) {
  .playground__pane {
    min-height: 280px;
  }
}
.playground__pane:first-child {
  border-right: 1px solid var(--color-border);
}
@media (max-width: 768px) {
  .playground__pane:first-child {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }
}
.playground__pane .pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  background: var(--color-surface-alpha-02);
  border-bottom: 1px solid var(--color-code-border);
}
.playground__pane .pane-header span {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-text-dim);
  font-weight: 500;
}
.playground__pane .pane-header .pane-tabs {
  display: flex;
  height: 100%;
  align-items: stretch;
  gap: 0;
}
.playground__pane .pane-header .pane-tabs button {
  padding: 0 0.9rem;
  background: none;
  border: none;
  border-right: 1px solid var(--color-code-border);
  color: var(--color-text-dim);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}
.playground__pane .pane-header .pane-tabs button:first-child {
  border-left: 1px solid var(--color-code-border);
}
.playground__pane .pane-header .pane-tabs button:hover {
  color: var(--color-text);
  background: var(--color-surface-alpha-02);
}
.playground__pane .pane-header .pane-tabs button.active {
  color: var(--color-primary);
  background: var(--color-code-bg);
  box-shadow: inset 0 -2px 0 var(--color-primary);
}
.playground__pane textarea,
.playground__pane .output-area {
  flex: 1;
  width: 100%;
  padding: 1.2rem;
  background: var(--color-code-bg);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.8;
  border: none;
  outline: none;
  resize: none;
  tab-size: 2;
}
.playground__pane textarea::placeholder {
  color: var(--color-text-dim);
}
.playground__pane .output-area {
  overflow-y: scroll;
  overflow-x: auto;
  white-space: pre-wrap;
}
.playground__pane .output-area::-webkit-scrollbar {
  width: 8px;
}
.playground__pane .output-area::-webkit-scrollbar-track {
  background: var(--color-code-bg);
}
.playground__pane .output-area::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}
.playground__pane .output-area::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-dim);
}
.playground__pane .output-area--error {
  color: var(--color-error);
}
.playground__pane .output-area--loading {
  color: var(--color-text-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  font-style: italic;
}
.playground__pane .output-area--graph {
  white-space: normal;
  overflow: hidden;
  padding: 0;
  background-color: var(--graph-bg);
}
.playground__pane .output-area--graph .dolfin-svg-graph-container {
  width: 100%;
  height: 100%;
}
.playground__pane .output-area--graph .graph-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  color: var(--color-text-dim);
  font-style: italic;
  font-size: 0.84rem;
}
.playground__pane .output-area--svg {
  white-space: normal;
  overflow: auto;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 1rem;
  background-color: var(--color-bg);
}
.playground__pane .output-area--svg svg {
  max-width: 100%;
  height: auto;
}
.playground__pane .output-area--svg svg rect[clip-path] {
  fill: var(--color-bg);
}
.playground__pane .output-area--svg svg rect:not([fill="#00000000"]) {
  fill: var(--color-bg);
}
.playground__pane .output-area--svg svg rect {
  stroke: var(--color-accent);
}
.playground__pane .output-area--svg svg path[id^=arrow] {
  stroke: var(--color-accent);
}
.playground__pane .output-area--svg svg text {
  fill: var(--color-bg);
}
.playground__pane .output-area--svg svg text tspan {
  fill: var(--color-text);
}
.playground__status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1.5rem;
  background: var(--color-surface-alpha-02);
  border-top: 1px solid var(--color-border);
  font-size: 0.78rem;
  color: var(--color-text-dim);
}
.playground__status .status-indicator {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.playground__status .status-indicator .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-success);
}
.playground__status .status-indicator .dot--error {
  background: var(--color-error);
}
.playground__status .status-indicator .dot--loading {
  background: var(--color-warning);
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.4;
  }
}
.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}
@media (max-width: 768px) {
  .use-cases-grid {
    grid-template-columns: 1fr;
  }
}

.use-case-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  gap: 1.5rem;
  transition: all 0.3s;
}
.use-case-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.use-case-card__icon {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  font-size: 1.6rem;
  background: var(--color-accent-alpha-10);
}
.use-case-card__content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.use-case-card__content p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 0.8rem;
}
.use-case-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.use-case-card__tags .tag {
  padding: 0.2rem 0.6rem;
  background: var(--color-primary-alpha-10);
  border-radius: 999px;
  font-size: 0.72rem;
  color: var(--color-primary-light);
  font-weight: 500;
}

.ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.ecosystem-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  transition: all 0.3s;
}
.ecosystem-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.ecosystem-card__header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1rem;
}
.ecosystem-card__header .tool-icon {
  font-size: 1.5rem;
}
.ecosystem-card__header h3 {
  font-size: 1.05rem;
  font-weight: 600;
}
.ecosystem-card__header .tool-badge {
  margin-left: auto;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.ecosystem-card__header .tool-badge--stable {
  background: var(--color-success-alpha-15);
  color: var(--color-success);
}
.ecosystem-card__header .tool-badge--beta {
  background: var(--color-warning-alpha-15);
  color: var(--color-warning);
}
.ecosystem-card__header .tool-badge--alpha {
  background: var(--color-error-alpha-15);
  color: var(--color-error);
}
.ecosystem-card__desc {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 1rem;
}
.ecosystem-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.ecosystem-card__tech .tech-tag {
  padding: 0.15rem 0.5rem;
  background: var(--color-surface-alpha-05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--color-text-dim);
}

.code-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}
@media (max-width: 768px) {
  .code-comparison {
    grid-template-columns: 1fr;
  }
}
.code-comparison__pane {
  background: var(--color-code-bg);
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.code-comparison__pane .pane-label {
  padding: 0.6rem 1rem;
  background: var(--color-surface-alpha-03);
  border-bottom: 1px solid var(--color-code-border);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.code-comparison__pane pre {
  padding: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.8;
  overflow-x: auto;
}
.code-comparison__pane pre code {
  color: var(--color-text-muted);
}
.code-comparison .arrow-divider {
  display: none;
}

.footer {
  padding: 4rem 0 2rem;
  border-top: 1px solid var(--color-border);
}
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}
@media (max-width: 768px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 480px) {
  .footer__grid {
    grid-template-columns: 1fr;
  }
}
.footer__brand h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
}
.footer__brand h3 span {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer__brand p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 320px;
}
.footer__column h4 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-dim);
  margin-bottom: 1rem;
}
.footer__column ul {
  list-style: none;
}
.footer__column ul li {
  margin-bottom: 0.5rem;
}
.footer__column ul li a {
  font-size: 0.88rem;
  color: var(--color-text-muted);
}
.footer__column ul li a:hover {
  color: var(--color-text);
}
.footer__bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--color-text-dim);
}
@media (max-width: 600px) {
  .footer__bottom {
    flex-direction: column;
    gap: 0.5rem;
  }
}

.syntax-keyword {
  color: var(--syntax-keyword);
}
.syntax-type {
  color: var(--syntax-type);
}
.syntax-property {
  color: var(--syntax-property);
}
.syntax-variable {
  color: var(--syntax-variable);
}
.syntax-string {
  color: var(--syntax-string);
}
.syntax-comment {
  color: var(--syntax-comment);
  font-style: italic;
}
.syntax-number {
  color: var(--syntax-number);
}
.syntax-iri {
  color: var(--syntax-iri);
}
.syntax-punctuation {
  color: var(--syntax-punctuation);
}
.syntax-name {
  color: var(--syntax-name);
}

.sample-selector {
  display: flex;
  gap: 0.4rem;
}
.sample-selector button {
  padding: 0.3rem 0.7rem;
  background: var(--color-surface-alpha-05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-dim);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: all 0.2s;
}
.sample-selector button:hover {
  background: var(--color-surface-alpha-10);
  color: var(--color-text);
}
.sample-selector button.active {
  background: var(--color-primary-alpha-15);
  border-color: var(--color-primary);
  color: var(--color-primary-light);
}