:root {
  /* Light mode (default) - Modern Tech Theme */
  --qs-primary: #0f4c75;
  --qs-primary-dark: #051f2c;
  --qs-primary-light: #3b82f6;
  --qs-secondary: #00bcd4;
  --qs-accent: #00e5ff;
  --qs-accent-bright: #ffff00;
  --qs-bg-dark: #f8fafc;
  --qs-bg-card: #ffffff;
  --qs-bg-gradient-start: #f8fafc;
  --qs-bg-gradient-end: #e8f1f8;
  --qs-text-main: #0a0e27;
  --qs-text-muted: #4a5568;
  --qs-border: #d4d9e6;
  --qs-code-bg: #f0f4f9;
  --qs-code-text: #0f4c75;
  --qs-success: #10b981;
  --qs-warning: #f59e0b;
  --qs-error: #ef4444;
  --qs-shadow: rgba(15, 76, 117, 0.08);
  --qs-shadow-hover: rgba(15, 76, 117, 0.15);
  --qs-shadow-md: rgba(15, 76, 117, 0.12);
}

[data-bs-theme="dark"] {
  /* Dark mode - Modern Tech Theme */
  --qs-primary: #0f4c75;
  --qs-primary-dark: #051f2c;
  --qs-primary-light: #3b82f6;
  --qs-secondary: #00bcd4;
  --qs-accent: #00e5ff;
  --qs-accent-bright: #ffff00;
  --qs-bg-dark: #0a0e27;
  --qs-bg-card: #0f1419;
  --qs-bg-gradient-start: #0a0e27;
  --qs-bg-gradient-end: #0f1c37;
  --qs-text-main: #f1f5f9;
  --qs-text-muted: #cbd5e1;
  --qs-border: #1e293b;
  --qs-code-bg: #0a0e27;
  --qs-code-text: #00e5ff;
  --qs-success: #34d399;
  --qs-warning: #fbbf24;
  --qs-error: #f87171;
  --qs-shadow: rgba(0, 0, 0, 0.3);
  --qs-shadow-hover: rgba(0, 0, 0, 0.5);
  --qs-shadow-md: rgba(0, 0, 0, 0.4);
}

* {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html {
  scroll-behavior: smooth;
}

body {
  background: linear-gradient(
    135deg,
    var(--qs-bg-gradient-start) 0%,
    var(--qs-bg-gradient-end) 100%
  );
  color: var(--qs-text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
    "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
    sans-serif;
  line-height: 1.6;
  letter-spacing: 0.3px;
  transition: background 0.3s ease, color 0.3s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

.navbar {
  background: linear-gradient(
    135deg,
    var(--qs-primary-dark) 0%,
    var(--qs-primary) 100%
  );
  border-bottom: 1px solid var(--qs-border);
  box-shadow: 0 4px 20px var(--qs-shadow);
  backdrop-filter: blur(10px);
  background-color: rgba(15, 76, 117, 0.95);
}

.navbar-brand {
  font-weight: 800;
  font-size: 1.6rem;
  color: #fff !important;
  letter-spacing: -0.5px;
  transition: transform 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.navbar-brand:hover {
  transform: scale(1.02);
}

.navbar-brand i {
  font-size: 1.8rem;
  animation: pulse-glow 2s infinite;
}

.navbar-brand span {
  background: linear-gradient(
    135deg,
    var(--qs-secondary) 0%,
    var(--qs-accent) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
}

@keyframes pulse-glow {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

/* Theme Toggle Switch */
.theme-toggle {
  position: relative;
  width: 54px;
  height: 28px;
  background: linear-gradient(135deg, #e0e7ff, #f0f4f9);
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 2px solid var(--qs-accent);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 4px;
}

.theme-toggle:hover {
  transform: scale(1.08);
  box-shadow: 0 8px 24px rgba(0, 229, 255, 0.3);
}

[data-bs-theme="dark"] .theme-toggle {
  background: linear-gradient(135deg, #0a0e27, #1a2847);
  border-color: var(--qs-accent);
}

.theme-toggle-slider {
  position: absolute;
  width: 22px;
  height: 22px;
  background: linear-gradient(135deg, #fff 0%, #f0f4f9 100%);
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
}

[data-bs-theme="dark"] .theme-toggle-slider {
  left: 26px;
  background: linear-gradient(135deg, #00e5ff 0%, #00bcd4 100%);
  box-shadow: 0 2px 8px rgba(0, 229, 255, 0.3);
}

.theme-toggle-slider i {
  font-size: 12px;
  color: #fbbf24;
  transition: all 0.3s ease;
}

[data-bs-theme="dark"] .theme-toggle-slider i {
  color: #fff;
}

.nav-link {
  color: rgba(255, 255, 255, 0.7) !important;
  transition: all 0.3s ease;
  position: relative;
  font-weight: 500;
  letter-spacing: 0.5px;
}

.nav-link:hover,
.nav-link.active {
  color: #fff !important;
}

.nav-link:hover::after,
.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--qs-accent), var(--qs-secondary));
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from {
    width: 0;
    left: 50%;
  }
  to {
    width: 100%;
    left: 0;
  }
}

.hero {
  background: linear-gradient(135deg, #051f2c 0%, #0f4c75 35%, #00bcd4 100%);
  padding: 120px 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: radial-gradient(
      circle at 20% 50%,
      rgba(0, 229, 255, 0.1) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 80%,
      rgba(0, 188, 212, 0.1) 0%,
      transparent 50%
    ),
    url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="1" fill="%23ffffff" opacity="0.05"/></svg>');
  background-size: 100% 100%, 100% 100%, 50px 50px;
  opacity: 1;
  z-index: 0;
}

.hero::after {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(
    circle,
    rgba(0, 229, 255, 0.15) 0%,
    transparent 70%
  );
  border-radius: 50%;
  animation: float 8s ease-in-out infinite;
  z-index: 0;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0px) translateX(0px);
  }
  50% {
    transform: translateY(-20px) translateX(-10px);
  }
}

.hero > * {
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 900;
  line-height: 1.2;
  color: #fff;
  letter-spacing: -1.5px;
  margin-bottom: 1.5rem;
  text-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.hero .lead {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 2.5rem;
  max-width: 600px;
  font-weight: 300;
  line-height: 1.8;
}

.btn-primary {
  background: linear-gradient(
    135deg,
    var(--qs-secondary) 0%,
    var(--qs-accent) 100%
  );
  border: none;
  color: #000;
  padding: 12px 32px;
  font-weight: 600;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  letter-spacing: 0.5px;
}

.btn-primary::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.2);
  transition: left 0.3s ease;
  z-index: -1;
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0, 229, 255, 0.4);
}

.btn-primary:active {
  transform: translateY(-1px);
}

.btn-outline-primary,
.btn-outline-light {
  border-width: 2px;
  padding: 12px 32px;
  font-weight: 600;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  letter-spacing: 0.5px;
}

[data-bs-theme="light"] .btn-outline-light {
  color: var(--qs-primary-dark) !important;
  border-color: var(--qs-primary-dark);
  background-color: transparent;
}

[data-bs-theme="light"] .btn-outline-light:hover {
  background: linear-gradient(135deg, var(--qs-primary-dark) 0%, var(--qs-primary) 100%);
  color: #fff !important;
  transform: translateY(-3px);
  box-shadow: 0 12px 32px var(--qs-shadow-hover);
  border-color: var(--qs-primary);
}

[data-bs-theme="dark"] .btn-outline-light {
  color: var(--qs-accent) !important;
  border-color: var(--qs-accent);
}

[data-bs-theme="dark"] .btn-outline-light:hover {
  background-color: var(--qs-accent);
  color: #000 !important;
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0, 229, 255, 0.3);
}

.card {
  background-color: var(--qs-bg-card);
  border: 1px solid var(--qs-border);
  border-radius: 16px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
  box-shadow: 0 4px 16px var(--qs-shadow);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 24px 48px var(--qs-shadow-hover);
  border-color: var(--qs-accent);
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--qs-secondary), var(--qs-accent));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover::before {
  opacity: 1;
}

.card-header {
  background: linear-gradient(
    135deg,
    var(--qs-primary) 0%,
    var(--qs-primary-light) 100%
  );
  border-bottom: 1px solid var(--qs-border);
  font-weight: 600;
  border-radius: 0 !important;
  color: #fff;
  padding: 1rem 1.5rem;
}

.card-body {
  padding: 1.75rem;
  position: relative;
}

.card-title {
  color: var(--qs-primary);
  font-weight: 700;
  letter-spacing: -0.3px;
  margin-bottom: 0.8rem;
}

[data-bs-theme="dark"] .card-title {
  color: var(--qs-accent);
}

.card-text {
  color: var(--qs-text-muted);
  line-height: 1.7;
}

.feature-icon {
  width: 70px;
  height: 70px;
  background: linear-gradient(
    135deg,
    var(--qs-secondary) 0%,
    var(--qs-accent) 100%
  );
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 2rem;
  color: #000;
  box-shadow: 0 8px 24px rgba(0, 188, 212, 0.3);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-bs-theme="dark"] .feature-icon {
  color: #000;
  box-shadow: 0 8px 24px rgba(0, 229, 255, 0.2);
}

.card:hover .feature-icon {
  transform: scale(1.1) rotate(-5deg);
  box-shadow: 0 12px 32px rgba(0, 188, 212, 0.4);
}

code {
  background-color: var(--qs-code-bg);
  color: var(--qs-code-text);
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 0.9em;
  font-weight: 500;
  letter-spacing: 0.2px;
  word-break: break-word;
}

pre {
  background-color: var(--qs-code-bg);
  border: 1px solid var(--qs-border);
  border-radius: 12px;
  padding: 1.25rem;
  overflow-x: auto;
  box-shadow: 0 4px 16px var(--qs-shadow);
}

pre code {
  background-color: transparent;
  padding: 0;
  color: var(--qs-code-text);
  font-weight: 400;
}

[data-bs-theme="dark"] pre {
  background-color: #0a0e27;
  border-color: #1e293b;
}

[data-bs-theme="dark"] pre code {
  color: #00e5ff;
}

.page-header {
  background: linear-gradient(
    135deg,
    var(--qs-primary-dark) 0%,
    var(--qs-primary) 50%,
    var(--qs-secondary) 100%
  );
  padding: 80px 0;
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--qs-border);
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: radial-gradient(
    circle at 80% 20%,
    rgba(0, 229, 255, 0.1) 0%,
    transparent 40%
  );
  opacity: 1;
}

.page-header > * {
  position: relative;
  z-index: 1;
}

.page-header h1 {
  font-weight: 800;
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.5rem);
  color: #fff;
  letter-spacing: -1px;
}

.breadcrumb {
  background-color: transparent;
  padding: 0 0 0.5rem 0;
}

.breadcrumb-item a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: all 0.3s ease;
  font-weight: 500;
}

.breadcrumb-item a:hover {
  color: var(--qs-accent);
}

.breadcrumb-item.active {
  color: rgba(255, 255, 255, 0.6);
  font-weight: 500;
}

.section-title {
  color: var(--qs-primary);
  font-weight: 800;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--qs-accent);
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  letter-spacing: -0.5px;
  position: relative;
  display: inline-block;
}

[data-bs-theme="dark"] .section-title {
  color: var(--qs-accent);
  border-bottom-color: var(--qs-secondary);
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--qs-secondary), var(--qs-accent));
}

table {
  background-color: var(--qs-bg-card);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 16px var(--qs-shadow);
}

.table {
  color: var(--qs-text-main);
  margin-bottom: 0;
  border-collapse: collapse;
}

.table thead th {
  background: linear-gradient(
    135deg,
    var(--qs-primary) 0%,
    var(--qs-primary-light) 100%
  );
  border-color: var(--qs-border);
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.3px;
  padding: 1rem 1.5rem;
}

.table tbody tr {
  border-color: var(--qs-border);
  transition: all 0.2s ease;
}

.table tbody tr:hover {
  background-color: rgba(0, 188, 212, 0.05);
}

[data-bs-theme="dark"] .table tbody tr:hover {
  background-color: rgba(0, 229, 255, 0.08);
}

.table td {
  padding: 1rem 1.5rem;
  vertical-align: middle;
}

.badge {
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  letter-spacing: 0.3px;
  font-size: 0.85rem;
  text-transform: uppercase;
  transition: all 0.3s ease;
}

.badge:hover {
  transform: scale(1.05);
}

.alert {
  border-radius: 12px;
  border-left: 4px solid;
  box-shadow: 0 4px 16px var(--qs-shadow);
  border: none;
}

.alert-info {
  background: linear-gradient(
    135deg,
    rgba(0, 188, 212, 0.1) 0%,
    rgba(0, 229, 255, 0.05) 100%
  );
  color: var(--qs-primary);
  border-left: 4px solid var(--qs-secondary);
}

[data-bs-theme="dark"] .alert-info {
  color: var(--qs-accent);
  border-left-color: var(--qs-accent);
}

.alert-warning {
  background: linear-gradient(
    135deg,
    rgba(245, 158, 11, 0.1) 0%,
    rgba(251, 191, 36, 0.05) 100%
  );
  color: var(--qs-warning);
  border-left: 4px solid var(--qs-warning);
}

.alert-success {
  background: linear-gradient(
    135deg,
    rgba(16, 185, 129, 0.1) 0%,
    rgba(52, 211, 153, 0.05) 100%
  );
  color: var(--qs-success);
  border-left: 4px solid var(--qs-success);
}

.alert-danger {
  background: linear-gradient(
    135deg,
    rgba(239, 68, 68, 0.1) 0%,
    rgba(248, 113, 113, 0.05) 100%
  );
  color: var(--qs-error);
  border-left: 4px solid var(--qs-error);
}

footer {
  background: linear-gradient(
    135deg,
    var(--qs-primary-dark) 0%,
    var(--qs-primary) 100%
  );
  border-top: 1px solid var(--qs-border);
  padding: 60px 0 30px 0;
  margin-top: 80px;
}

footer a {
  color: var(--qs-accent);
  text-decoration: none;
  transition: all 0.3s ease;
  font-weight: 500;
}

footer a:hover {
  color: #fff;
  transform: translateX(2px);
}

footer h5,
footer h6 {
  color: #fff;
  font-weight: 700;
  letter-spacing: -0.3px;
  margin-bottom: 1.5rem;
}

footer .text-muted {
  color: rgba(255, 255, 255, 0.7) !important;
  line-height: 1.8;
}

.nav-pills .nav-link {
  color: var(--qs-text-muted);
  border-radius: 12px;
  padding: 10px 20px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  font-weight: 500;
  letter-spacing: 0.3px;
}

.nav-pills .nav-link:hover {
  background: linear-gradient(
    135deg,
    var(--qs-secondary) 0%,
    var(--qs-accent) 100%
  );
  color: #000;
  transform: translateX(4px);
}

.nav-pills .nav-link.active {
  background: linear-gradient(
    135deg,
    var(--qs-secondary) 0%,
    var(--qs-accent) 100%
  );
  color: #000;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(0, 188, 212, 0.3);
}

.list-group-item {
  background-color: var(--qs-bg-card);
  border-color: var(--qs-border);
  color: var(--qs-text-main);
  transition: all 0.3s ease;
  border-radius: 12px;
  margin-bottom: 0.5rem;
}

.list-group-item:hover {
  background: linear-gradient(
    135deg,
    var(--qs-secondary) 0%,
    var(--qs-accent) 100%
  );
  color: #000;
  transform: translateX(4px);
  border-color: var(--qs-accent);
}

.list-group-item.active {
  background: linear-gradient(
    135deg,
    var(--qs-secondary) 0%,
    var(--qs-accent) 100%
  );
  color: #000;
  border-color: var(--qs-accent);
}

.sdk-card {
  height: 100%;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.sdk-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.1),
    transparent
  );
  transition: left 0.5s ease;
  z-index: 0;
}

.sdk-card:hover::before {
  left: 100%;
}

.sdk-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 16px 40px var(--qs-shadow-hover);
}

.sdk-logo {
  height: 50px;
  margin-bottom: 1.5rem;
  filter: brightness(0) invert(1);
  opacity: 0.7;
  transition: all 0.3s ease;
}

.sdk-card:hover .sdk-logo {
  opacity: 1;
  transform: scale(1.1);
}

.endpoint-method {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.8rem;
  margin-right: 10px;
  min-width: 75px;
  text-align: center;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  box-shadow: 0 4px 12px var(--qs-shadow);
}

.method-get {
  background: linear-gradient(135deg, #2196f3, #1976d2);
  color: #fff;
}

.method-post {
  background: linear-gradient(135deg, #4caf50, #388e3c);
  color: #fff;
}

.method-put {
  background: linear-gradient(135deg, #ff9800, #f57c00);
  color: #fff;
}

.method-delete {
  background: linear-gradient(135deg, #f44336, #d32f2f);
  color: #fff;
}

.toc {
  position: sticky;
  top: 100px;
  padding: 20px;
  background: var(--qs-bg-card);
  border-radius: 12px;
  border: 1px solid var(--qs-border);
  box-shadow: 0 4px 16px var(--qs-shadow);
}

.toc h6 {
  font-weight: 700;
  color: var(--qs-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: 0.85rem;
}

[data-bs-theme="dark"] .toc h6 {
  color: var(--qs-accent);
}

.toc .nav-link {
  color: var(--qs-text-muted);
  padding: 10px 0;
  border-left: 3px solid transparent;
  padding-left: 1rem;
  transition: all 0.3s ease;
  font-weight: 500;
}

.toc .nav-link:hover,
.toc .nav-link.active {
  color: var(--qs-accent);
  border-left-color: var(--qs-accent);
  background-color: transparent;
  padding-left: 1.25rem;
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero .lead {
    font-size: 1rem;
  }

  .page-header {
    padding: 50px 0;
  }

  .page-header h1 {
    font-size: 2rem;
  }

  .toc {
    position: static;
    margin-bottom: 2rem;
    top: auto;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .btn-primary,
  .btn-outline-primary,
  .btn-outline-light {
    padding: 10px 24px;
    font-size: 0.95rem;
  }
}

/* Additional Polish & Section Styling */
section {
  padding: 60px 0;
}

section:first-of-type {
  padding-top: 40px;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  letter-spacing: -0.5px;
  font-weight: 700;
}

p {
  line-height: 1.8;
}

.lead {
  line-height: 1.9;
  font-weight: 300;
}

/* Enhanced hover effects */
a {
  transition: all 0.3s ease;
}

a:not(.btn):not(.nav-link):not(.breadcrumb-item) {
  color: var(--qs-accent);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

[data-bs-theme="dark"] a:not(.btn):not(.nav-link):not(.breadcrumb-item) {
  color: var(--qs-accent);
}

a:not(.btn):not(.nav-link):not(.breadcrumb-item):hover {
  text-decoration-color: var(--qs-secondary);
}

/* Image styling */
img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
}

/* Better form styling */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
textarea,
select {
  background-color: var(--qs-bg-card);
  color: var(--qs-text-main);
  border-color: var(--qs-border);
  border-radius: 8px;
  transition: all 0.3s ease;
  padding: 0.75rem 1rem;
  font-family: inherit;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="search"]:focus,
textarea:focus,
select:focus {
  background-color: var(--qs-bg-card);
  color: var(--qs-text-main);
  border-color: var(--qs-accent);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.1);
  outline: none;
}

/* Smooth scrollbar */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--qs-bg-gradient-start);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(135deg, var(--qs-secondary), var(--qs-accent));
  border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(135deg, var(--qs-accent), var(--qs-secondary));
}

/* Utility animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

/* Responsive container padding */
@media (max-width: 576px) {
  section {
    padding: 40px 0;
  }

  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .page-header {
    padding: 40px 0;
  }

  .hero {
    padding: 60px 0;
  }
}

/* Print styles */
@media print {
  .navbar,
  footer,
  .theme-toggle,
  .toc {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }
}