:root {
  /* Light Theme */
  --primary: #4361ee;
  --secondary: #3f37c9;
  --accent: #4895ef;
  --text: #2b2d42;
  --background: #f8f9fa;
  --card-bg: #ffffff;
  --input-bg: #ffffff;
  --border: #e9ecef;
  --success: #4cc9f0;
  --error: #f72585;
  --warning: #f8961e;

  /* Dark Theme */
  --dark-primary: #4895ef;
  --dark-secondary: #4361ee;
  --dark-accent: #3f37c9;
  --dark-text: #f8f9fa;
  --dark-background: #121212;
  --dark-card-bg: #1e1e1e;
  --dark-input-bg: #2d2d2d;
  --dark-border: #3d3d3d;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  transition: background-color 0.3s, color 0.3s;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--background);
}

body.dark-mode {
  --primary: var(--dark-primary);
  --secondary: var(--dark-secondary);
  --accent: var(--dark-accent);
  --text: var(--dark-text);
  --background: var(--dark-background);
  --card-bg: var(--dark-card-bg);
  --input-bg: var(--dark-input-bg);
  --border: var(--dark-border);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header Styles */
header {
  background-color: var(--primary);
  color: white;
  padding: 1rem 0;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 600;
}

.logo i {
  font-size: 1.8rem;
}

.theme-toggle {
  background: none;
  border: none;
  color: white;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 5px;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

/* Platform Selector */
.platform-selector {
  margin: 2rem 0 1rem;
}

.platform-tabs {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 10px;
}

.platform-tab {
  padding: 0.8rem 1.2rem;
  background-color: var(--card-bg);
  border-radius: 8px;
  cursor: pointer;
  font-weight: 500;
  white-space: nowrap;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border);
}

.platform-tab.active {
  background-color: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* Input Section */
.input-section {
  background-color: var(--card-bg);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  margin-bottom: 2rem;
  border: 1px solid var(--border);
}

.input-section h2 {
  margin-bottom: 1.5rem;
  color: var(--primary);
}

.input-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

.input-group {
  margin-bottom: 1.2rem;
}

.input-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text);
}

.input-group input,
.input-group select,
.input-group textarea {
  width: 100%;
  padding: 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background-color: var(--input-bg);
  color: var(--text);
  font-size: 1rem;
}

.input-group textarea {
  min-height: 100px;
  resize: vertical;
}

.generate-btn {
  width: 100%;
  padding: 1rem;
  background-color: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: background-color 0.2s;
}

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

/* Output Section */
.output-section {
  margin-bottom: 2rem;
}

.loading {
  display: flex;
  justify-content: center;
  gap: 10px;
  padding: 2rem;
}

.loading-dot {
  width: 12px;
  height: 12px;
  background-color: var(--primary);
  border-radius: 50%;
  animation: bounce 1.4s infinite ease-in-out;
}

.loading-dot:nth-child(2) {
  animation-delay: 0.2s;
}

.loading-dot:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes bounce {
  0%,
  80%,
  100% {
    transform: scale(0);
  }
  40% {
    transform: scale(1);
  }
}

.output-card {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border);
  position: relative;
}

.output-card h3 {
  color: var(--primary);
  margin-bottom: 1rem;
}

.output-card p {
  white-space: pre-line;
  margin-bottom: 1.5rem;
}

.copy-btn,
.save-btn {
  position: absolute;
  right: 1.5rem;
  background-color: var(--background);
  border: none;
  border-radius: 6px;
  padding: 0.5rem 0.8rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  color: var(--text);
}

.copy-btn {
  bottom: 1.5rem;
}

.save-btn {
  bottom: 4rem;
}

.copy-btn:hover,
.save-btn:hover {
  background-color: var(--primary);
  color: white;
}

/* History Section */
.history-section {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border);
}

.history-section h2 {
  color: var(--primary);
  margin-bottom: 1rem;
}

.history-items {
  max-height: 400px;
  overflow-y: auto;
  padding-right: 10px;
}

.history-item {
  background-color: var(--background);
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 0.8rem;
  cursor: pointer;
  border: 1px solid var(--border);
}

.history-item:hover {
  background-color: var(--primary);
  color: white;
}

.history-item h4 {
  margin-bottom: 0.3rem;
}

.history-item p {
  font-size: 0.9rem;
  opacity: 0.8;
}

.toggle-history {
  background: none;
  border: none;
  color: var(--primary);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 5px;
  margin-top: 1rem;
  cursor: pointer;
}

/* Footer */
footer {
  background-color: var(--primary);
  color: white;
  padding: 2rem 0;
  margin-top: 3rem;
}

.footer-content {
  text-align: center;
}

.footer-content .logo {
  justify-content: center;
  margin-bottom: 1rem;
}

.footer-content p {
  margin-bottom: 1rem;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.social-links a {
  color: white;
  font-size: 1.2rem;
}

.copyright {
  font-size: 0.9rem;
  opacity: 0.8;
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: var(--success);
  color: white;
  padding: 1rem 1.5rem;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.3s ease;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
  .input-grid {
    grid-template-columns: 1fr;
  }

  .platform-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .output-card {
    padding: 1.2rem;
  }

  .copy-btn,
  .save-btn {
    position: static;
    display: inline-block;
    margin-top: 1rem;
    margin-right: 0.5rem;
  }
}

.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 15px;
  margin-top: 15px;
}

.option-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 15px;
  position: relative;
}

.option-card p {
  margin-bottom: 25px;
}

.option-card .copy-btn {
  position: absolute;
  bottom: 10px;
  right: 10px;
}

.output-group {
  margin-bottom: 30px;
}

.output-group h2 {
  color: var(--primary);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.hashtags-container {
  background: var(--card-bg);
  padding: 15px;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.tips {
  background: rgba(72, 149, 239, 0.1);
  padding: 15px;
  border-radius: 8px;
}