:root {
  --color-primary: #0969da;
  --color-primary-hover: #0550ae;
  --color-bg: #ffffff;
  --color-bg-secondary: #f6f8fa;
  --color-text: #1f2328;
  --color-text-secondary: #656d76;
  --color-border: #d0d7de;
  --color-accent: #8250df;
  --color-accent-hover: #6639ba;
  --color-success: #1a7f37;
  --color-warning: #9a6700;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --radius: 6px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
  --transition-speed: 0.3s;
}

[data-theme="dark"] {
  --color-primary: #58a6ff;
  --color-primary-hover: #79c0ff;
  --color-bg: #0d1117;
  --color-bg-secondary: #161b22;
  --color-text: #e6edf3;
  --color-text-secondary: #8b949e;
  --color-border: #30363d;
  --color-accent: #bc8cff;
  --color-accent-hover: #d2a8ff;
  --color-success: #3fb950;
  --color-warning: #d29922;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  color: var(--color-text);
  margin: 0;
  padding: 0;
  line-height: 1.6;
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

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

a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
}


.site-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.site-nav a {
  padding: 6px 12px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  color: var(--color-text);
  transition: background-color var(--transition-speed), color var(--transition-speed);
  white-space: nowrap;
}

.site-nav a:hover {
  background-color: var(--color-border);
  text-decoration: none;
}

.site-nav a.active {
  color: var(--color-primary);
  font-weight: 600;
}

.burger-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  color: var(--color-text);
  font-size: 1.5rem;
  line-height: 1;
}

.burger-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  margin: 5px 0;
  transition: transform var(--transition-speed), opacity var(--transition-speed);
}

.burger-btn[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.burger-btn[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.burger-btn[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 6px 10px;
  font-size: 1rem;
  color: var(--color-text);
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.theme-toggle:hover {
  background-color: var(--color-border);
}

.page-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--spacing-xl);
  min-height: calc(100vh - 200px);
}

.main-content {
  min-width: 0;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.sidebar-block {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.sidebar-block h3 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin: 0 0 var(--spacing-md) 0;
}

.sidebar-nav a {
  display: block;
  padding: 6px 0;
  font-size: 0.875rem;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-nav a:last-child {
  border-bottom: none;
}

.site-footer {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-xl) var(--spacing-lg);
  margin-top: var(--spacing-xl);
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.footer-col h4 {
  margin: 0 0 var(--spacing-md) 0;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
}

.footer-col a {
  display: block;
  padding: 4px 0;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

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

.footer-bottom {
  max-width: 1200px;
  margin: var(--spacing-lg) auto 0;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.card-grid {
  display: grid;
  gap: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  transition: transform var(--transition-speed), box-shadow var(--transition-speed),
    background-color var(--transition-speed), border-color var(--transition-speed);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.card h3 {
  margin: 0 0 var(--spacing-sm) 0;
}

.card p {
  color: var(--color-text-secondary);
  margin: 0;
  font-size: 0.875rem;
}



.data-table th,
.data-table td {
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  text-align: left;
}

.data-table th {
  background-color: var(--color-bg-secondary);
  font-weight: 600;
}

.data-table tbody tr {
  transition: background-color var(--transition-speed);
}

.data-table tbody tr:hover {
  background-color: var(--color-bg-secondary);
}

.demo-box {
  background-color: var(--color-primary);
  color: #fff;
  width: 80px;
  height: 80px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.75rem;
  margin: var(--spacing-md) 0;
}


.anim-bounce {
  animation: bounce 1s ease infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-30px); }
}

.anim-spin {
  animation: spin 2s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.anim-pulse {
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.1); opacity: 0.7; }
}

.anim-slide-in {
  animation: slideIn 0.6s ease forwards;
}

@keyframes slideIn {
  from { transform: translateX(-100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

.anim-fade-in {
  animation: fadeIn 1s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.anim-shake {
  animation: shake 0.5s ease-in-out;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-10px); }
  75% { transform: translateX(10px); }
}


.code-block {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  overflow-x: auto;
  margin: var(--spacing-md) 0;
  line-height: 1.5;
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  margin-bottom: 4px;
  font-size: 0.875rem;
  font-weight: 600;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-main);
  font-size: 0.875rem;
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition-speed);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.15);
}

.form-group input:invalid:not(:placeholder-shown) {
  border-color: #cf222e;
}

.form-group .error-msg {
  color: #cf222e;
  font-size: 0.75rem;
  margin-top: 4px;
  display: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition-speed), transform 0.15s;
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
}

.btn-primary:active {
  transform: scale(0.98);
}

.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--radius);
  margin: var(--spacing-lg) 0;
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.subscribe-form input {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: var(--spacing-sm);
  font-size: 0.8125rem;
  background-color: var(--color-bg);
  color: var(--color-text);
}

.subscribe-form button {
  width: 100%;
  padding: 8px;
  background-color: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.8125rem;
  font-weight: 600;
  transition: background-color var(--transition-speed);
}

.subscribe-form button:hover {
  background-color: var(--color-primary-hover);
}

.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 200;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}

.modal-overlay.active {
  display: flex;
}

.modal-content {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-xl);
  max-width: 500px;
  width: 90%;
  position: relative;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from { transform: translateY(30px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}



.modal-close:hover {
  color: var(--color-text);
}



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

  .sidebar {
    order: 2;
  }

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

  .hero h1 {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  .burger-btn {
    display: block;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: var(--shadow);
  }

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

  .site-nav a {
    padding: 10px 12px;
  }

  .header-inner {
    flex-wrap: wrap;
  }


}