/* ==========================================
   DevStudy - CSS Styles
   Um guia completo de estudos para HTML & CSS
   ========================================== */

/* ==========================================
   Reset e Base
   ========================================== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  color: #1a202c;
  background-color: #ffffff;
  line-height: 1.6;
  overflow-x: hidden;
}

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

img {
  max-width: 100%;
  height: auto;
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
}

code {
  font-family: "Fira Code", "Consolas", monospace;
}

/* ==========================================
   Utilities
   ========================================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ==========================================
   Header & Navigation
   ========================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
  transition: 0.3s ease;
}

[data-theme="dark"] .header {
  background: rgba(26, 32, 44, 0.95);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  max-width: 1400px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.5rem;
  font-weight: 700;
}

.logo-icon {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-size: 1.8rem;
}

.logo-text {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-link {
  font-weight: 500;
  color: #4a5568;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: 0.15s ease;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: #667eea;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 50%;
  transform: translateX(-50%);
  width: 6px;
  height: 6px;
  background: #667eea;
  border-radius: 50%;
}

/* Link Especial para Desafios */
.nav-link.challenges-link {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white !important;
  -webkit-text-fill-color: white;
  border-radius: 16px;
  padding: 0.5rem 1.5rem;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
  transition: 0.3s ease;
}

.nav-link.challenges-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.theme-toggle {
  background: #edf2f7;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 16px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: 0.3s ease;
}

.theme-toggle:hover {
  background: #f7fafc;
  transform: scale(1.05);
}

.moon-icon {
  display: none;
}

[data-theme="dark"] .sun-icon {
  display: none;
}

[data-theme="dark"] .moon-icon {
  display: inline;
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 0.5rem;
}

.mobile-menu-btn span {
  display: block;
  width: 25px;
  height: 3px;
  background: #1a202c;
  border-radius: 2px;
  transition: 0.3s ease;
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(80px + 4rem) 2rem 4rem;
  background: #f7fafc;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -30%;
  width: 80%;
  height: 150%;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  opacity: 0.05;
  border-radius: 50%;
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0) rotate(0deg);
  }
  50% {
    transform: translateY(-50px) rotate(5deg);
  }
}

.hero-content {
  max-width: 600px;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  background: rgba(102, 126, 234, 0.1);
  color: #667eea;
  padding: 0.5rem 1rem;
  border-radius: 24px;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
  animation: fadeInUp 0.6s ease;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  animation: fadeInUp 0.6s ease 0.1s both;
}

.hero-title .highlight {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.2rem;
  color: #4a5568;
  margin-bottom: 2rem;
  animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  margin-bottom: 3rem;
  animation: fadeInUp 0.6s ease 0.3s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2rem;
  border-radius: 16px;
  font-weight: 600;
  font-size: 1rem;
  transition: 0.3s ease;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.btn-secondary {
  background: transparent;
  color: #1a202c;
  border: 2px solid #edf2f7;
}

.btn-secondary:hover {
  border-color: #667eea;
  color: #667eea;
}

.hero-stats {
  display: flex;
  gap: 3rem;
  animation: fadeInUp 0.6s ease 0.4s both;
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.9rem;
  color: #718096;
}

.hero-visual {
  z-index: 1;
  animation: fadeInRight 0.8s ease 0.3s both;
}

.code-window {
  background: #1e1e2e;
  border-radius: 16px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
  overflow: hidden;
  width: 400px;
  max-width: 90vw;
}

.code-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem;
  background: #181825;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot.red {
  background: #f38ba8;
}
.dot.yellow {
  background: #f9e2af;
}
.dot.green {
  background: #a6e3a1;
}

.file-name {
  color: #cdd6f4;
  font-size: 0.85rem;
  margin-left: 0.5rem;
}

.code-content {
  padding: 1.5rem;
  color: #cdd6f4;
  font-family: "Fira Code", "Consolas", monospace;
  font-size: 0.9rem;
  line-height: 1.8;
  overflow-x: auto;
}

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

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ==========================================
   Sections
   ========================================== */
.section {
  padding: 4rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-badge {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  border-radius: 24px;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.html-badge {
  background: rgba(255, 107, 53, 0.15);
  color: #ff6b35;
}

.css-badge {
  background: rgba(66, 153, 225, 0.15);
  color: #4299e1;
}

.practice-badge {
  background: rgba(72, 187, 120, 0.15);
  color: #48bb78;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  margin-bottom: 1rem;
}

.section-description {
  font-size: 1.1rem;
  color: #4a5568;
  max-width: 600px;
  margin: 0 auto;
}

/* HTML Section */
.html-section {
  background: #ffffff;
}

/* CSS Section */
.css-section {
  background: #f7fafc;
}

/* ==========================================
   Info Cards
   ========================================== */
.info-card {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  padding: 2rem;
  background: linear-gradient(
    135deg,
    rgba(102, 126, 234, 0.1),
    rgba(118, 75, 162, 0.1)
  );
  border-radius: 16px;
  margin-bottom: 3rem;
  border-left: 4px solid #667eea;
}

.info-card.css-info {
  background: linear-gradient(
    135deg,
    rgba(66, 153, 225, 0.1),
    rgba(49, 130, 206, 0.1)
  );
  border-left-color: #4299e1;
}

.info-icon {
  font-size: 2.5rem;
}

.info-content h3 {
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
}

.info-content p {
  color: #4a5568;
}

/* ==========================================
   Topic Cards
   ========================================== */
.topic-card {
  background: #ffffff;
  border-radius: 16px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
  border: 1px solid #edf2f7;
  transition: 0.3s ease;
}

[data-theme="dark"] .topic-card {
  background: #f7fafc;
  border-color: #edf2f7;
}

.topic-card:hover {
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.topic-card.highlight-card {
  border: 2px solid transparent;
  background:
    linear-gradient(#ffffff, #ffffff) padding-box,
    linear-gradient(135deg, #667eea 0%, #764ba2 100%) border-box;
}

[data-theme="dark"] .topic-card.highlight-card {
  background:
    linear-gradient(#f7fafc, #f7fafc) padding-box,
    linear-gradient(135deg, #667eea 0%, #764ba2 100%) border-box;
}

.topic-card.css-highlight {
  background:
    linear-gradient(#ffffff, #ffffff) padding-box,
    linear-gradient(135deg, #4299e1, #3182ce) border-box;
}

[data-theme="dark"] .topic-card.css-highlight {
  background:
    linear-gradient(#f7fafc, #f7fafc) padding-box,
    linear-gradient(135deg, #4299e1, #3182ce) border-box;
}

.topic-title {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.topic-icon {
  font-size: 1.8rem;
}

.topic-description {
  color: #4a5568;
  margin-bottom: 1.5rem;
}

/* ==========================================
   Tags Grid
   ========================================== */
.tags-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.tag-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem;
  background: #f7fafc;
  border-radius: 8px;
  border: 1px solid #edf2f7;
  transition: 0.3s ease;
  cursor: pointer;
}

[data-theme="dark"] .tag-item {
  background: #edf2f7;
}

.tag-item:hover {
  border-color: #667eea;
  transform: translateY(-2px);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

.tag-item.semantic {
  border-left: 3px solid #667eea;
}

.tag-item code {
  color: #667eea;
  font-size: 0.95rem;
  font-weight: 600;
}

.tag-desc {
  font-size: 0.85rem;
  color: #4a5568;
}

/* ==========================================
   Code Examples
   ========================================== */
.code-example {
  background: #1e1e2e;
  border-radius: 16px;
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.code-example .code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 1rem;
  background: #181825;
}

.code-label {
  color: #a6adc8;
  font-size: 0.85rem;
}

.copy-btn {
  background: transparent;
  border: 1px solid #45475a;
  color: #cdd6f4;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.8rem;
  transition: 0.15s ease;
}

.copy-btn:hover {
  background: #45475a;
}

.code-example pre {
  padding: 1.5rem;
  overflow-x: auto;
  margin: 0;
}

.code-example code {
  color: #cdd6f4;
  font-family: "Fira Code", "Consolas", monospace;
  font-size: 0.9rem;
  line-height: 1.7;
}

.code-example .comment {
  color: #6c7086;
  font-style: italic;
}

.code-example.small {
  margin-bottom: 0;
}

.code-example.small pre {
  padding: 1rem;
}

.code-example.small code {
  font-size: 0.8rem;
}

/* ==========================================
   Live Preview
   ========================================== */
.live-preview {
  background: #f7fafc;
  border-radius: 8px;
  padding: 1.5rem;
  margin-top: 1.5rem;
  border: 1px dashed #edf2f7;
}

[data-theme="dark"] .live-preview {
  background: #edf2f7;
}

.live-preview h4 {
  margin-bottom: 1rem;
  color: #4a5568;
}

.preview-content {
  padding: 1rem;
}

/* ==========================================
   Semantic Visual
   ========================================== */
.semantic-visual {
  margin: 2rem 0;
}

.semantic-layout {
  display: grid;
  gap: 0.5rem;
  max-width: 600px;
  margin: 0 auto;
}

.semantic-layout > div {
  padding: 1rem;
  border-radius: 8px;
  font-family: "Fira Code", "Consolas", monospace;
  font-size: 0.85rem;
  color: white;
  text-align: center;
}

.sem-header {
  background: #ff6b35;
  grid-column: 1 / -1;
}

.sem-nav {
  background: #f7c948;
  color: #333 !important;
  grid-column: 1 / -1;
}

.sem-main-area {
  display: grid;
  grid-template-columns: 1fr 200px;
  gap: 0.5rem;
  grid-column: 1 / -1;
}

.sem-main {
  background: #48bb78;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  border-radius: 8px;
}

.sem-article {
  background: rgba(255, 255, 255, 0.2);
  padding: 1rem;
  border-radius: 4px;
}

.sem-section {
  background: rgba(255, 255, 255, 0.2);
  padding: 1rem;
  border-radius: 4px;
}

.sem-aside {
  background: #4299e1;
  padding: 1rem;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sem-footer {
  background: #9f7aea;
  grid-column: 1 / -1;
}

/* Details Demo */
.demo-details {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  border-radius: 8px;
  padding: 1rem;
}

.demo-details summary {
  cursor: pointer;
  font-weight: 600;
  padding: 0.5rem;
}

.demo-details p {
  padding: 1rem;
  margin-top: 0.5rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

/* ==========================================
   Lists Demo
   ========================================== */
.lists-demo {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.list-type {
  padding: 1.5rem;
  background: #f7fafc;
  border-radius: 8px;
}

[data-theme="dark"] .list-type {
  background: #edf2f7;
}

.list-type h4 {
  margin-bottom: 1rem;
  font-size: 1rem;
}

.list-type ul,
.list-type ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.list-type ul {
  list-style: disc;
}

.list-type ol {
  list-style: decimal;
}

.list-type li {
  margin-bottom: 0.25rem;
}

.list-type dl {
  margin-bottom: 1rem;
}

.list-type dt {
  font-weight: 600;
}

.list-type dd {
  color: #4a5568;
  margin-left: 1rem;
  margin-bottom: 0.5rem;
}

.list-type code {
  font-size: 0.75rem;
  color: #718096;
  display: block;
  margin-top: auto;
}

/* ==========================================
   Demo Table
   ========================================== */
.demo-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

.demo-table th,
.demo-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid #edf2f7;
}

.demo-table th {
  background: #f7fafc;
  font-weight: 600;
}

[data-theme="dark"] .demo-table th {
  background: #edf2f7;
}

.demo-table tr:hover {
  background: #f7fafc;
}

.demo-table code {
  background: rgba(102, 126, 234, 0.1);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  color: #667eea;
}

/* ==========================================
   Input Types Demo
   ========================================== */
.input-types-demo {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
}

.input-demo {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.input-demo label {
  font-family: "Fira Code", "Consolas", monospace;
  color: #667eea;
  font-size: 0.85rem;
}

.input-demo input {
  padding: 0.5rem;
  border: 1px solid #edf2f7;
  border-radius: 4px;
  font-family: inherit;
  transition: 0.15s ease;
}

.input-demo input:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

/* ==========================================
   Comparison Box
   ========================================== */
.comparison-box {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 1.5rem;
}

.comp-item {
  padding: 1.5rem;
  background: #f7fafc;
  border-radius: 8px;
}

[data-theme="dark"] .comp-item {
  background: #edf2f7;
}

.comp-item h4 {
  margin-bottom: 1rem;
}

.comp-item code {
  font-size: 1.3rem;
  color: #667eea;
}

.comp-item p {
  margin: 1rem 0;
  color: #4a5568;
}

.visual-demo {
  padding: 1rem;
  background: #edf2f7;
  border-radius: 4px;
  margin-top: 1rem;
}

[data-theme="dark"] .visual-demo {
  background: #f7fafc;
}

.div-demo div {
  background: #667eea;
  color: white;
  padding: 0.5rem;
  margin-bottom: 0.5rem;
  border-radius: 4px;
  text-align: center;
}

.span-demo span {
  background: #764ba2;
  color: white;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  margin-right: 0.25rem;
}

.class-box {
  border-left: 4px solid #764ba2;
}

.id-box {
  border-left: 4px solid #667eea;
}

/* ==========================================
   CSS Syntax Visual
   ========================================== */
.css-syntax-visual {
  display: flex;
  justify-content: center;
  margin: 3rem 0;
}

.syntax-diagram {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  background: #1e1e2e;
  padding: 2rem;
  border-radius: 16px;
  font-family: "Fira Code", "Consolas", monospace;
  font-size: 1.2rem;
}

.syntax-selector {
  color: #f9e2af;
  padding: 0.25rem 0.5rem;
  background: rgba(249, 226, 175, 0.1);
  border-radius: 4px;
}

.syntax-bracket {
  color: #cdd6f4;
}

.syntax-declaration {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding-left: 1.5rem;
}

.syntax-property {
  color: #89b4fa;
}

.syntax-colon {
  color: #cdd6f4;
}

.syntax-value {
  color: #a6e3a1;
}

.syntax-semicolon {
  color: #cdd6f4;
}

/* ==========================================
   CSS Methods
   ========================================== */
.css-methods {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.method-card {
  background: #f7fafc;
  padding: 1.5rem;
  border-radius: 16px;
  position: relative;
}

[data-theme="dark"] .method-card {
  background: #edf2f7;
}

.method-number {
  position: absolute;
  top: -10px;
  left: -10px;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.2rem;
}

.method-card h4 {
  margin-bottom: 0.5rem;
  padding-left: 1.5rem;
}

.method-card p {
  color: #4a5568;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.method-card pre {
  background: #1e1e2e;
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
}

.method-card code {
  color: #cdd6f4;
  font-size: 0.85rem;
}

.method-badge {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 500;
}

.method-badge.good {
  background: rgba(72, 187, 120, 0.15);
  color: #48bb78;
}

.method-badge.medium {
  background: rgba(237, 137, 54, 0.15);
  color: #ed8936;
}

.method-badge.bad {
  background: rgba(245, 101, 101, 0.15);
  color: #f56565;
}

/* ==========================================
   Colors Demo
   ========================================== */
.colors-demo {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.color-method {
  padding: 1.5rem;
  background: #f7fafc;
  border-radius: 8px;
  text-align: center;
}

[data-theme="dark"] .color-method {
  background: #edf2f7;
}

.color-method h4 {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.color-method code {
  display: block;
  font-size: 0.8rem;
  margin-bottom: 1rem;
  color: #4a5568;
}

.color-preview {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  margin: 0 auto;
  border: 3px solid white;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* Interactive Color Demo */
.interactive-demo {
  background: #f7fafc;
  padding: 1.5rem;
  border-radius: 16px;
  margin-top: 1.5rem;
}

[data-theme="dark"] .interactive-demo {
  background: #edf2f7;
}

.color-picker-demo {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
}

.color-picker-demo input[type="color"] {
  width: 60px;
  height: 60px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

.color-result {
  flex: 1;
  min-width: 200px;
  padding: 1.5rem;
  border-radius: 8px;
  text-align: center;
  font-weight: 600;
  transition: 0.3s ease;
}

.color-codes code {
  display: block;
  padding: 1rem;
  background: #1e1e2e;
  color: #cdd6f4;
  border-radius: 8px;
}

/* ==========================================
   Background Demos
   ========================================== */
.background-demos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.bg-demo {
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  color: white;
  font-size: 0.85rem;
  text-align: center;
  padding: 1rem;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

/* ==========================================
   Text Demos
   ========================================== */
.text-demos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.text-demos p {
  padding: 1rem;
  background: #f7fafc;
  border-radius: 8px;
  text-align: center;
}

[data-theme="dark"] .text-demos p {
  background: #edf2f7;
}

/* ==========================================
   Box Model Visual
   ========================================== */
.box-model-visual {
  display: flex;
  justify-content: center;
  margin: 3rem 0;
}

.box-margin {
  background: #fbd38d;
  padding: 30px;
  border-radius: 8px;
  position: relative;
}

.box-border {
  background: #fc8181;
  padding: 20px;
  border-radius: 8px;
}

.box-padding {
  background: #68d391;
  padding: 30px;
  border-radius: 8px;
}

.box-content {
  background: #63b3ed;
  padding: 40px 60px;
  border-radius: 8px;
  color: white;
  font-weight: 600;
  text-align: center;
}

.box-label {
  position: absolute;
  top: 5px;
  left: 10px;
  font-size: 0.75rem;
  font-weight: 600;
  color: rgba(0, 0, 0, 0.5);
}

.box-margin .box-label {
  color: #975a16;
}
.box-border .box-label {
  position: relative;
  color: #c53030;
}
.box-padding .box-label {
  position: relative;
  color: #276749;
}

/* Box Sizing Demo */
.box-sizing-demo {
  margin-top: 2rem;
}

.sizing-comparison {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
}

.sizing-box {
  width: 200px;
  padding: 1.5rem;
  border: 5px solid #667eea;
  background: rgba(102, 126, 234, 0.1);
  border-radius: 8px;
  text-align: center;
}

.sizing-box.content-box {
  box-sizing: content-box;
}

.sizing-box.border-box {
  box-sizing: border-box;
}

.sizing-box span {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.sizing-box small {
  font-size: 0.75rem;
  color: #718096;
}

/* ==========================================
   Display Demos
   ========================================== */
.display-demos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.display-type {
  padding: 1.5rem;
  background: #f7fafc;
  border-radius: 8px;
}

[data-theme="dark"] .display-type {
  background: #edf2f7;
}

.display-type h4 {
  margin-bottom: 0.5rem;
  color: #667eea;
}

.display-type p {
  font-size: 0.9rem;
  color: #4a5568;
  margin-bottom: 1rem;
}

.display-visual {
  padding: 1rem;
  background: #edf2f7;
  border-radius: 4px;
  margin-bottom: 0.5rem;
}

[data-theme="dark"] .display-visual {
  background: #f7fafc;
}

.d-block {
  background: #667eea;
  color: white;
  padding: 0.5rem;
  margin-bottom: 0.25rem;
  border-radius: 4px;
  text-align: center;
}

.d-inline {
  background: #764ba2;
  color: white;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

.d-inline-block {
  display: inline-block;
  background: #f093fb;
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  margin-right: 0.25rem;
}

.display-type code {
  font-size: 0.8rem;
  color: #718096;
}

/* ==========================================
   Flexbox Playground
   ========================================== */
.flex-playground {
  background: #f7fafc;
  padding: 2rem;
  border-radius: 16px;
  margin-top: 1.5rem;
}

[data-theme="dark"] .flex-playground {
  background: #edf2f7;
}

.flex-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.control-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: #4a5568;
}

.control-group select,
.control-group input[type="range"] {
  padding: 0.5rem;
  border: 1px solid #edf2f7;
  border-radius: 4px;
  font-family: inherit;
  background: #ffffff;
}

[data-theme="dark"] .control-group select,
[data-theme="dark"] .control-group input {
  background: #f7fafc;
  border-color: #ffffff;
  color: #1a202c;
}

.flex-demo-container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  min-height: 200px;
  background: #edf2f7;
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

[data-theme="dark"] .flex-demo-container {
  background: #f7fafc;
}

.flex-item {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  font-weight: bold;
  font-size: 1.2rem;
}

.flex-code-output {
  background: #1e1e2e;
  border-radius: 8px;
  padding: 1rem;
}

.flex-code-output code {
  color: #cdd6f4;
  font-size: 0.9rem;
}

/* Flex Examples */
.flex-examples {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.flex-example-item {
  padding: 1.5rem;
  background: #f7fafc;
  border-radius: 8px;
}

[data-theme="dark"] .flex-example-item {
  background: #edf2f7;
}

.flex-example-item h5 {
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.flex-ex {
  display: flex;
  min-height: 100px;
  background: #edf2f7;
  border-radius: 8px;
  margin-bottom: 0.5rem;
  padding: 0.5rem;
}

[data-theme="dark"] .flex-ex {
  background: #f7fafc;
}

.center-demo {
  justify-content: center;
  align-items: center;
}

.centered-box {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.space-between-demo {
  justify-content: space-between;
  align-items: center;
}

.space-between-demo div {
  width: 40px;
  height: 40px;
  background: #667eea;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
}

.grow-demo div {
  padding: 1rem;
  background: #667eea;
  color: white;
  text-align: center;
  border-radius: 4px;
  margin: 0.25rem;
  font-size: 0.75rem;
}

.flex-example-item code {
  font-size: 0.75rem;
  color: #718096;
}

/* ==========================================
   Grid Demo
   ========================================== */
.grid-visual-demo {
  margin-top: 2rem;
}

.grid-demo {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 1rem;
}

.grid-item {
  padding: 2rem;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  text-align: center;
  font-size: 1.5rem;
  font-weight: bold;
  border-radius: 8px;
}

.grid-layout-demo {
  margin-top: 3rem;
}

.grid-areas-demo {
  display: grid;
  grid-template-columns: 150px 1fr 100px;
  grid-template-rows: auto 150px auto;
  grid-template-areas:
    "header header header"
    "nav    main   aside"
    "footer footer footer";
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.grid-areas-demo > div {
  padding: 1rem;
  color: white;
  text-align: center;
  font-family: "Fira Code", "Consolas", monospace;
  font-size: 0.85rem;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ga-header {
  grid-area: header;
  background: #ff6b35;
}
.ga-nav {
  grid-area: nav;
  background: #f7c948;
  color: #333 !important;
}
.ga-main {
  grid-area: main;
  background: #48bb78;
}
.ga-aside {
  grid-area: aside;
  background: #4299e1;
}
.ga-footer {
  grid-area: footer;
  background: #9f7aea;
}

/* ==========================================
   Position Demos
   ========================================== */
.position-demos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.position-type {
  padding: 1.5rem;
  background: #f7fafc;
  border-radius: 8px;
}

[data-theme="dark"] .position-type {
  background: #edf2f7;
}

.position-type h4 {
  color: #667eea;
  margin-bottom: 0.5rem;
}

.position-type p {
  font-size: 0.9rem;
  color: #4a5568;
  margin-bottom: 1rem;
}

.pos-demo {
  background: #edf2f7;
  padding: 1.5rem;
  border-radius: 8px;
  min-height: 80px;
}

[data-theme="dark"] .pos-demo {
  background: #f7fafc;
}

.pos-box {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: #667eea;
  color: white;
  border-radius: 4px;
  font-size: 0.85rem;
}

.relative-demo .moved {
  position: relative;
  top: 10px;
  left: 20px;
  background: #764ba2;
}

.absolute-demo {
  padding: 0;
}

.pos-parent {
  position: relative;
  background: #f7fafc;
  padding: 2rem;
  border-radius: 8px;
  min-height: 100px;
}

[data-theme="dark"] .pos-parent {
  background: #edf2f7;
}

.pos-absolute {
  position: absolute;
  top: 10px;
  right: 10px;
  background: #f093fb;
  color: white;
  padding: 0.5rem;
  border-radius: 4px;
  font-size: 0.8rem;
}

/* ==========================================
   Pseudo Demo
   ========================================== */
.pseudo-section {
  margin-top: 2rem;
}

.pseudo-section h4 {
  margin-bottom: 1rem;
  color: #667eea;
}

.pseudo-demo {
  margin: 1.5rem 0;
  text-align: center;
}

/* ==========================================
   Transitions Demo
   ========================================== */
.transition-demos {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
  margin: 2rem 0;
}

.trans-box {
  width: 80px;
  height: 80px;
  background: #667eea;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.trans-box.t1:hover {
  background: #764ba2;
}

.trans-box.t2:hover {
  transform: scale(1.3);
}

.trans-box.t3:hover {
  transform: rotate(180deg);
}

.trans-box.t4:hover {
  background: linear-gradient(135deg, #f093fb, #f5576c);
}

/* ==========================================
   Animation Demos
   ========================================== */
.animation-demos {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: center;
  margin: 2rem 0;
}

.anim-box {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 500;
}

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

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

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

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

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

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

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

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-5px);
  }
  75% {
    transform: translateX(5px);
  }
}

/* ==========================================
   Transform Demos
   ========================================== */
.transform-demos {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: center;
  margin: 2rem 0;
  padding: 2rem;
}

.tf-box {
  width: 80px;
  height: 80px;
  background: #667eea;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  font-size: 0.75rem;
  font-weight: 500;
  text-align: center;
}

.tf-translate {
  transform: translate(10px, -10px);
  background: #764ba2;
}

.tf-scale {
  transform: scale(1.2);
  background: #48bb78;
}

.tf-rotate {
  transform: rotate(15deg);
  background: #ed8936;
}

.tf-skew {
  transform: skewX(-10deg);
  background: #f56565;
}

/* ==========================================
   Responsive Demo
   ========================================== */
.responsive-demo {
  margin-top: 2rem;
}

.responsive-box {
  padding: 2rem;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  text-align: center;
  border-radius: 16px;
  font-weight: 600;
}

.screen-size::after {
  content: "Mobile";
}

@media (min-width: 768px) {
  .screen-size::after {
    content: "Tablet (768px+)";
  }
}

@media (min-width: 1024px) {
  .screen-size::after {
    content: "Desktop (1024px+)";
  }
}

@media (min-width: 1440px) {
  .screen-size::after {
    content: "Desktop Grande (1440px+)";
  }
}

/* ==========================================
   Variables Demo
   ========================================== */
.variables-demo {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-top: 1.5rem;
}

.var-box {
  width: 120px;
  height: 120px;
  background: #667eea;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  font-size: 0.75rem;
  text-align: center;
  padding: 0.5rem;
}

/* ==========================================
   Practice Section / Live Editor
   ========================================== */
.practice-section {
  background: #ffffff;
}

.live-editor {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  min-height: 500px;
}

.editor-panel {
  background: #1e1e2e;
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.editor-header {
  display: flex;
  background: #181825;
  padding: 0.5rem;
}

.editor-tab {
  padding: 0.5rem 1.5rem;
  color: #6c7086;
  cursor: pointer;
  border-radius: 4px;
  transition: 0.15s ease;
}

.editor-tab:hover {
  color: #cdd6f4;
}

.editor-tab.active {
  background: #1e1e2e;
  color: #cdd6f4;
}

.code-editor {
  flex: 1;
  background: transparent;
  border: none;
  color: #cdd6f4;
  font-family: "Fira Code", "Consolas", monospace;
  font-size: 0.9rem;
  line-height: 1.6;
  padding: 1.5rem;
  resize: none;
  outline: none;
}

.preview-panel {
  background: #f7fafc;
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid #edf2f7;
}

[data-theme="dark"] .preview-panel {
  background: #edf2f7;
}

.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background: #edf2f7;
  font-weight: 500;
}

[data-theme="dark"] .preview-header {
  background: #f7fafc;
}

.reset-btn {
  background: transparent;
  border: 1px solid #718096;
  color: #4a5568;
  padding: 0.25rem 1rem;
  border-radius: 4px;
  font-size: 0.85rem;
  transition: 0.15s ease;
}

.reset-btn:hover {
  border-color: #667eea;
  color: #667eea;
}

.preview-frame {
  flex: 1;
  border: none;
  background: white;
}

/* ==========================================
   Reference Section
   ========================================== */
.reference-section {
  background: #f7fafc;
}

.reference-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.ref-card {
  background: #ffffff;
  padding: 2rem;
  border-radius: 16px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

[data-theme="dark"] .ref-card {
  background: #edf2f7;
}

.ref-card h3 {
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

.ref-card ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.ref-card li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ref-card code {
  background: rgba(102, 126, 234, 0.1);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  color: #667eea;
  font-size: 0.85rem;
}

.ref-card a {
  color: #667eea;
  transition: 0.15s ease;
}

.ref-card a:hover {
  text-decoration: underline;
}

.color-swatches {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
}

.swatch {
  aspect-ratio: 1;
  border-radius: 8px;
  cursor: pointer;
  transition: 0.15s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

.swatch:hover {
  transform: scale(1.1);
}

/* ==========================================
   Footer
   ========================================== */
.footer {
  background: #1a202c;
  color: white;
  padding: 4rem 0;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.5rem;
  font-weight: 700;
}

.footer-logo .logo-icon {
  font-size: 1.8rem;
}

.footer p {
  color: rgba(255, 255, 255, 0.7);
}

.footer-date {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
}

/* ==========================================
   Back to Top Button
   ========================================== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: 0.3s ease;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  z-index: 1000;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-5px);
}

/* ==========================================
   Media Queries
   ========================================== */
@media (max-width: 1024px) {
  .hero {
    flex-direction: column;
    text-align: center;
    padding-top: 120px;
  }

  .hero-stats {
    justify-content: center;
  }

  .hero-visual {
    margin-top: 3rem;
  }

  .live-editor {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 1.5rem;
  }

  .code-window {
    width: 100%;
  }

  .topic-title {
    font-size: 1.2rem;
  }

  .tags-grid {
    grid-template-columns: 1fr;
  }

  .sem-main-area {
    grid-template-columns: 1fr;
  }

  .grid-areas-demo {
    grid-template-columns: 1fr;
    grid-template-areas:
      "header"
      "nav"
      "main"
      "aside"
      "footer";
  }

  .flex-playground {
    padding: 1rem;
  }

  .flex-controls {
    flex-direction: column;
  }

  .comparison-box {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  :root {
    font-size: 14px;
  }

  .navbar {
    padding: 1rem;
  }

  .section {
    padding: 3rem 0;
  }

  .topic-card {
    padding: 1rem;
  }

  .code-example pre {
    padding: 1rem;
    font-size: 0.8rem;
  }

  .flex-demo-container {
    flex-wrap: wrap;
  }

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

/* ==========================================
   Selection Styles
   ========================================== */
::selection {
  background: #667eea;
  color: white;
}

/* ==========================================
   Scrollbar Styles
   ========================================== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: #f7fafc;
}

::-webkit-scrollbar-thumb {
  background: #667eea;
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: #5a67d8;
}

/* Print Styles */
@media print {
  .header,
  .back-to-top,
  .theme-toggle,
  .copy-btn,
  .live-editor {
    display: none !important;
  }

  .section {
    break-inside: avoid;
    page-break-inside: avoid;
  }
}

/* ==========================================
   Autocomplete / Intellisense Styles
   ========================================== */
.autocomplete-popup {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  background: #ffffff !important;
  border: 1px solid #e0e0e0 !important;
  border-radius: 16px !important;
  box-shadow: 0 10px 50px rgba(0, 0, 0, 0.25) !important;
}

[data-theme="dark"] .autocomplete-popup {
  background: #f7fafc !important;
  border-color: #e0e0e0 !important;
}

.autocomplete-popup::-webkit-scrollbar {
  width: 6px;
}

.autocomplete-popup::-webkit-scrollbar-thumb {
  background: #667eea;
  border-radius: 3px;
}

.autocomplete-item {
  padding: 10px 14px !important;
  border-bottom: 1px solid #e0e0e0 !important;
  transition: all 0.15s ease !important;
}

.autocomplete-item:last-child {
  border-bottom: none !important;
}

.autocomplete-item:hover,
.autocomplete-item.selected {
  background: #667eea !important;
  color: white !important;
}

.autocomplete-item:hover *,
.autocomplete-item.selected * {
  color: white !important;
}

/* Indicador de atalho */
.autocomplete-popup::after {
  content: "?? navegar  ? selecionar  Esc fechar";
  display: block;
  padding: 8px 14px;
  font-size: 0.75rem;
  color: #4a5568;
  background: #edf2f7;
  border-top: 1px solid #e0e0e0;
  text-align: center;
}

[data-theme="dark"] .autocomplete-popup::after {
  background: #ffffff;
}

/* ==========================================
   JavaScript Button & Link Styles
   ========================================== */
.btn-js {
  background: linear-gradient(135deg, #f7df1e 0%, #e6c700 100%);
  color: #1a1a1a !important;
  font-weight: 600;
  border: none;
  padding: 0.875rem 2rem;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
}

.btn-js:hover {
  background: linear-gradient(135deg, #ffe034 0%, #f7df1e 100%);
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(247, 223, 30, 0.3);
}

.highlight-js {
  background: linear-gradient(135deg, #f7df1e, #e6c700);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.js-link {
  position: relative;
}

.js-link::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: #f7df1e;
  transition: width 0.3s ease;
}

.js-link:hover::after {
  width: 100%;
}

/* User Profile in Header */
.user-profile-mini {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: 16px;
  background: #edf2f7;
  cursor: pointer;
  transition: all 0.3s ease;
}

.user-profile-mini:hover {
  background: #667eea;
  color: white;
}

.user-profile-mini .avatar {
  font-size: 1.5rem;
}

.user-profile-mini .level-badge {
  font-size: 0.7rem;
  padding: 0.1rem 0.5rem;
  background: #667eea;
  color: white;
  border-radius: 9999px;
}

.user-profile-mini:hover .level-badge {
  background: white;
  color: #667eea;
}

/* ==========================================
   Section Heroes (HTML & CSS)
   ========================================== */
.section-hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
  padding: 3rem;
  margin-bottom: 3rem;
  border-radius: 24px;
  position: relative;
  overflow: hidden;
}

.html-hero {
  background: linear-gradient(135deg, #e44d26 0%, #f16529 100%);
  color: white;
}

.css-hero {
  background: linear-gradient(135deg, #264de4 0%, #2965f1 100%);
  color: white;
}

.section-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 0L30 60M0 30L60 30' stroke='rgba(255,255,255,0.1)' stroke-width='1'/%3E%3C/svg%3E");
  pointer-events: none;
}

.section-hero-content {
  flex: 1;
  position: relative;
  z-index: 1;
}

.section-hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin: 1rem 0;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.hero-icon {
  font-size: 2.5rem;
}

.section-hero-description {
  font-size: 1.1rem;
  opacity: 0.95;
  max-width: 500px;
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.section-hero-stats {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

.mini-stat {
  text-align: center;
}

.mini-stat-number {
  display: block;
  font-size: 1.75rem;
  font-weight: 800;
}

.mini-stat-label {
  font-size: 0.85rem;
  opacity: 0.9;
}

.section-hero-visual {
  position: relative;
  z-index: 1;
}

/* Floating Tags Animation */
.floating-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  max-width: 250px;
}

.float-tag {
  background: rgba(255, 255, 255, 0.2);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-family: "Fira Code", "Consolas", monospace;
  font-size: 0.9rem;
  animation: float 3s ease-in-out infinite;
  backdrop-filter: blur(5px);
}

.float-tag:nth-child(1) {
  animation-delay: 0s;
}
.float-tag:nth-child(2) {
  animation-delay: 0.5s;
}
.float-tag:nth-child(3) {
  animation-delay: 1s;
}
.float-tag:nth-child(4) {
  animation-delay: 1.5s;
}
.float-tag:nth-child(5) {
  animation-delay: 2s;
}
.float-tag:nth-child(6) {
  animation-delay: 2.5s;
}

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

/* CSS Preview Box */
.css-preview-box {
  padding: 2rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  backdrop-filter: blur(10px);
}

.preview-element {
  min-width: 200px;
  animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%,
  100% {
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
  }
  50% {
    box-shadow: 0 0 40px rgba(255, 255, 255, 0.4);
  }
}

/* Responsive Section Heroes */
@media (max-width: 768px) {
  .section-hero {
    flex-direction: column;
    text-align: center;
    padding: 2rem;
  }

  .section-hero-title {
    font-size: 1.75rem;
    justify-content: center;
  }

  .section-hero-description {
    max-width: 100%;
  }

  .section-hero-stats {
    justify-content: center;
  }

  .floating-tags {
    justify-content: center;
    max-width: 100%;
  }
}

/* ==========================================
   Utility Classes for JS Interactions
   ========================================== */

/* Theme toggle animation */
.theme-toggle.rotating {
  transform: rotate(360deg);
}

/* Header scroll shadow */
.header.scrolled {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

/* Copy button success state */
.copy-btn.copied {
  background: #48bb78;
  border-color: #48bb78;
}

/* Toast slide out animation */
.toast.slide-out {
  animation: slideOut 0.3s ease forwards;
}

/* Fade utilities */
.fade-in {
  display: block;
}

.fade-out {
  display: none;
}

/* Visibility utilities */
.hidden {
  display: none !important;
}

.visible {
  display: block;
}

/* Body overflow control */
body.no-scroll {
  overflow: hidden;
}