:root {
  --bg: #0b1020;
  --card: rgba(255, 255, 255, 0.05);
  --glass: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.15);
  --text: #e9eefb;
  --muted: #a9b4d0;
  --accent: #7aa2ff;
  --primary-button-bg: #4CAF50;
  --primary-button-hover: #45a049;
  --secondary-button-bg: transparent;
  --secondary-button-text: #7aa2ff;
}

body.light-mode {
  --bg: #f0f4f8;
  --card: rgba(0, 0, 0, 0.05);
  --glass: rgba(0, 0, 0, 0.08);
  --border: rgba(0, 0, 0, 0.15);
  --text: #1a202c;
  --muted: #4a5568;
  --accent: #3182ce;
  --primary-button-bg: #4CAF50;
  --primary-button-hover: #45a049;
  --secondary-button-bg: transparent;
  --secondary-button-text: #3182ce;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  height: 100%;
}
body {
  font-family: system-ui, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: background-color 0.3s, color 0.3s;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.container {
  width: 90%;
  max-width: 1100px;
  margin: auto;
}

.site-header {
  background: var(--glass);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container,
.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
  flex-wrap: wrap;
}

.logo {
  font-size: 20px;
  font-weight: bold;
  color: var(--accent);
  text-decoration: none;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 15px;
}

nav a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
}

nav a:hover {
  color: var(--accent);
}

nav a.active {
  color: var(--accent);
  font-weight: bold;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 3px;
}

.theme-switcher {
  background: transparent;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
  margin-left: 20px;
  padding: 5px;
  line-height: 1;
}

.hero {
  text-align: center;
  padding: 60px 20px;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
}

.subtitle {
  color: var(--muted);
  font-size: 1.2rem;
}

.grid {
  margin-top: 40px;
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
  padding: 20px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--glass);
  text-decoration: none;
  color: var(--text);
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.4);
}

.card h2 {
  margin-bottom: 8px;
  color: var(--accent);
}

.adsense-slot {
  margin: 40px 0;
  text-align: center;
  min-height: 90px;
  background: var(--card);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.page {
  flex: 1;
}

.page h1 {
  margin-bottom: 20px;
  text-align: center;
}

.page h2 {
  font-size: 1.5rem;
  margin: 25px 0 10px;
  color: var(--accent);
}

/* --- Optimized Tool Page Styling --- */
.tool-content {
  text-align: center;
  margin-bottom: 30px;
}

.tool-grid {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.tool-input-section, .tool-preview-section {
  flex: 1;
  min-width: 300px;
  padding: 0;
}

.tool-card-content {
    padding: 20px;
}

textarea {
  width: 100%;
  min-height: 400px;
  font-size: 1rem;
  border-radius: 12px;
  padding: 15px;
  border: 1px solid var(--border);
  background: var(--glass);
  color: var(--text);
  resize: vertical;
  box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.1);
}

.live-preview {
  width: 100%;
  min-height: 400px;
  border: 1px solid var(--border);
  background-color: white;
  border-radius: 12px;
}

.live-preview-box-content {
  width: 100%;
  min-height: 400px;
  overflow: auto;
  padding: 15px;
  background-color: var(--text);
  color: var(--bg);
  border-radius: 12px;
  box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.1);
}

.live-preview-box-content p {
  padding: 0;
  margin: 0;
}

.live-preview-box-content pre {
  white-space: pre-wrap;
  word-wrap: break-word;
  font-family: monospace;
}

/* Buttons and Inputs */
.primary-button, .secondary-button {
  display: block;
  font-size: 1.1rem;
  padding: 14px;
  border-radius: 12px;
  width: 100%;
  border: none;
  cursor: pointer;
  font-weight: bold;
  transition: transform 0.2s, opacity 0.2s;
  margin-top: 15px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.primary-button {
  background-color: var(--primary-button-bg);
  color: white;
}

.primary-button:hover {
  background-color: var(--primary-button-hover);
  transform: translateY(-2px);
}

.secondary-button {
  background-color: var(--secondary-button-bg);
  color: var(--secondary-button-text);
  border: 1px solid var(--border);
}

.secondary-button:hover {
  background-color: var(--glass);
}

button:disabled {
  background: gray;
  cursor: not-allowed;
  box-shadow: none;
}

/* Other Forms & Sections */
form label, form input, form textarea, form button {
  display: block;
  width: 100%;
  margin-bottom: 15px;
}

form input, form textarea {
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--glass);
  color: var(--text);
  width: 100%;
  box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.1);
}

details {
  background: var(--glass);
  padding: 15px;
  border-radius: 10px;
  margin: 15px 0;
  border: 1px solid var(--border);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

summary {
  cursor: pointer;
  font-weight: bold;
  font-size: 1.1rem;
}

summary::marker {
  color: var(--accent);
}

.info-section {
  margin-top: 40px;
}

.info-section ol {
  list-style-type: none;
  padding: 0;
  margin-top: 20px;
}

.info-section ol li {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 15px;
  margin-bottom: 10px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 20px 0;
  margin-top: auto;
  border-top: 1px solid var(--border);
}

@media (max-width: 768px) {
  .site-header .container {
    flex-direction: column;
    text-align: center;
  }
  nav ul {
    margin-top: 10px;
    justify-content: center;
    gap: 10px;
  }
}