:root {
  --primary-color: #81C784;
  --secondary-color: #967E76;
  --accent-color: #FF9800;
  --text-color: #333333;
  --light-bg: #F5F5DC;
  --dark-bg: #1A3E3E;
  --highlight: #2196F3;
  --white: #FFFFFF;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Open Sans', Roboto, sans-serif;
}

body {
  background: linear-gradient(135deg, var(--light-bg) 0%, var(--white) 100%);
  color: var(--text-color);
  line-height: 1.6;
  padding: 0;
  margin: 0;
  min-height: 100%;
  overflow-x: hidden;
}

.header {
  background: linear-gradient(rgba(255,255,255,0.9), rgba(255,255,255,0.7)), 
              url('https://images.gptkong.com/demo/sample1.png') right bottom/cover no-repeat,
              url('https://images.gptkong.com/demo/sample2.png') left top/contain no-repeat;
  height: 500px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
  position: relative;
  margin-bottom: 3rem;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 20% 50%, rgba(129, 199, 132, 0.1) 0%, transparent 50%);
  z-index: -1;
}

.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: rgba(255,255,255,0.95);
  box-shadow: 0 2px 15px rgba(0,0,0,0.1);
  z-index: 1000;
  padding: 1rem 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.nav-links a {
  color: var(--secondary-color);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  padding: 0.5rem 1rem;
  border-radius: 4px;
}

.nav-links a:hover {
  color: var(--primary-color);
  background: rgba(129, 199, 132, 0.1);
  transform: translateY(-2px);
}

.container {
  max-width: 1200px;
  margin: 6rem auto 3rem;
  padding: 0 2rem;
}

.article {
  background: var(--white);
  border-radius: 12px;
  box-shadow: 0 5px 25px rgba(0,0,0,0.08);
  padding: 3rem;
  margin-bottom: 3rem;
  position: relative;
  overflow: hidden;
}

.article::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 150px;
  height: 150px;
  background: url('https://images.gptkong.com/demo/sample3.png') no-repeat;
  background-size: contain;
  opacity: 0.1;
  z-index: 0;
}

h1, h2, h3, h4 {
  color: var(--dark-bg);
  margin-bottom: 1.5rem;
  font-weight: 700;
  position: relative;
}

h1 {
  font-size: 2.5rem;
  line-height: 1.2;
}

h2 {
  font-size: 2rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--primary-color);
}

h3 {
  font-size: 1.5rem;
  color: var(--secondary-color);
}

h4 {
  font-size: 1.2rem;
}

p {
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
  color: var(--text-color);
}

pre {
  background: #f8f8f8;
  border-radius: 8px;
  padding: 1.5rem;
  margin: 2rem 0;
  overflow: auto;
  box-shadow: inset 0 0 10px rgba(0,0,0,0.05);
  border-left: 4px solid var(--primary-color);
}

code {
  font-family: 'Courier New', monospace;
  color: #333;
}

.img-container {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin: 2rem 0;
  justify-content: center;
}

.img-card {
  width: 300px;
  height: 300px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 20px rgba(0,0,0,0.1);
  transition: all 0.3s ease;
}

.img-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

.img-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.img-card:hover img {
  transform: scale(1.1);
}

.notice {
  background: rgba(255, 152, 0, 0.1);
  border-left: 4px solid var(--accent-color);
  padding: 1rem;
  margin: 2rem 0;
  border-radius: 0 8px 8px 0;
}

.notice p {
  margin: 0;
  color: var(--accent-color);
  font-weight: 600;
}

.footer {
  background: var(--dark-bg);
  color: var(--white);
  padding: 3rem 0;
  text-align: center;
  margin-top: 3rem;
}

.footer p {
  color: var(--white);
}

@media (max-width: 768px) {
  .header {
    height: 400px;
    padding: 1rem;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .article {
    padding: 2rem;
  }
  
  .img-card {
    width: 100%;
    max-width: 300px;
  }
}

@media (max-width: 480px) {
  .header {
    height: 350px;
  }
  
  .nav-links {
    gap: 1rem;
  }
  
  .container {
    padding: 0 1rem;
  }
  
  .article {
    padding: 1.5rem;
  }
}

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

.floating {
  animation: float 3s ease-in-out infinite;
}

/* Tooltip */
.tooltip {
  position: relative;
  display: inline-block;
  border-bottom: 1px dotted var(--secondary-color);
  cursor: help;
}

.tooltip .tooltiptext {
  visibility: hidden;
  width: 200px;
  background-color: var(--dark-bg);
  color: var(--white);
  text-align: center;
  border-radius: 6px;
  padding: 5px;
  position: absolute;
  z-index: 1;
  bottom: 125%;
  left: 50%;
  margin-left: -100px;
  opacity: 0;
  transition: opacity 0.3s;
}

.tooltip:hover .tooltiptext {
  visibility: visible;
  opacity: 1;
}

/* Accordion */
.accordion {
  background-color: var(--light-bg);
  color: var(--text-color);
  cursor: pointer;
  padding: 1rem;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 1rem;
  transition: 0.4s;
  border-radius: 8px;
  margin-bottom: 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.accordion:hover {
  background-color: rgba(129, 199, 132, 0.2);
}

.accordion:after {
  content: '+';
  font-size: 1.2rem;
  color: var(--primary-color);
  font-weight: bold;
  float: right;
  margin-left: 5px;
}

.active:after {
  content: '-';
}

.panel {
  padding: 0 1rem;
  background-color: white;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease-out;
  border-radius: 0 0 8px 8px;
  margin-bottom: 1rem;
}

/* Button styles */
.button {
  display: inline-block;
  background-color: var(--accent-color);
  color: var(--white);
  padding: 12px 24px;
  border: none;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(255, 152, 0, 0.3);
}

.button:hover {
  background-color: #E68900;
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(255, 152, 0, 0.4);
}

.button:active {
  transform: translateY(1px);
}

/* Card styles */
.card {
  background: var(--white);
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  padding: 2rem;
  margin-bottom: 2rem;
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  padding: 1rem;
  background-color: var(--light-bg);
  border-radius: 8px;
  margin-bottom: 2rem;
}

.breadcrumb li {
  display: inline;
  font-size: 0.9rem;
}

.breadcrumb li+li:before {
  padding: 0 8px;
  color: var(--secondary-color);
  content: ">";
}

.breadcrumb a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s;
}

.breadcrumb a:hover {
  color: var(--accent-color);
  text-decoration: underline;
}

/* Highlight box */
.highlight-box {
  background: linear-gradient(135deg, rgba(129, 199, 132, 0.1) 0%, rgba(255, 255, 255, 0.8) 100%);
  border-radius: 12px;
  padding: 2rem;
  margin: 2rem 0;
  border-left: 5px solid var(--primary-color);
  position: relative;
  overflow: hidden;
}

.highlight-box::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 200%;
  background: radial-gradient(circle, rgba(129, 199, 132, 0.05) 0%, transparent 70%);
  z-index: 0;
}

.highlight-box * {
  position: relative;
  z-index: 1;
}

/* Floating action button */
.fab {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 60px;
  height: 60px;
  background-color: var(--primary-color);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  cursor: pointer;
  transition: all 0.3s ease;
  z-index: 999;
}

.fab:hover {
  background-color: #6BBF7A;
  transform: scale(1.1);
  box-shadow: 0 6px 25px rgba(0,0,0,0.3);
}

/* Pulse animation */
@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

.pulse {
  animation: pulse 2s infinite;
}