@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --bg-color: #09090b;       /* Deep zinc */
  --card-bg: #18181b;        /* Slightly lighter zinc */
  --text-primary: #fafafa;
  --text-secondary: #a1a1aa;
  --accent: #3b82f6;         /* Modern blue */
  --accent-hover: #2563eb;
  --accent-glow: rgba(59, 130, 246, 0.25);
  --border-color: #27272a;
  --border-hover: #3f3f46;
  --input-bg: #09090b;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Navbar */
.navbar {
  background-color: rgba(24, 24, 27, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar .brand {
  color: var(--text-primary);
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.navbar .back-btn {
  margin-right: 15px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 0.2s ease;
}

.navbar .back-btn:hover {
  color: var(--text-primary);
}

/* Main Container & Hero */
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 3rem 2rem;
}

.hero {
  margin-bottom: 3rem;
  animation: fadeUp 0.6s ease-out forwards;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}

.hero p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Homepage Grid */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

/* Tool Cards with subtle hover animations */
.tool-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.75rem;
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  opacity: 0;
  animation: fadeUp 0.6s ease-out forwards;
}

/* Staggered animation delays for cards */
.tool-card:nth-child(1) { animation-delay: 0.1s; }
.tool-card:nth-child(2) { animation-delay: 0.2s; }
.tool-card:nth-child(3) { animation-delay: 0.3s; }
.tool-card:nth-child(4) { animation-delay: 0.4s; }

.tool-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  background-color: #1f1f22;
  box-shadow: 0 10px 30px -10px var(--accent-glow);
}

.tool-card h3 {
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.tool-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* Tool Specific Layouts */
.tool-header {
  margin-bottom: 2rem;
  animation: fadeUp 0.4s ease-out forwards;
}

.tool-layout {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  animation: fadeUp 0.5s ease-out forwards;
}

.tool-panel {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
  flex: 1;
  min-width: 320px;
}

/* Forms and Inputs */
.form-group {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

input[type="text"],
input[type="number"],
textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  background-color: var(--input-bg);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: 8px;
  font-family: 'Inter', monospace;
  font-size: 0.95rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

button {
  background-color: var(--text-primary);
  color: var(--bg-color);
  border: none;
  padding: 0.875rem 1.5rem;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

button:hover {
  background-color: #e4e4e7;
  transform: translateY(-1px);
}

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

/* Secondary Button Style */
button.secondary {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

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

/* Checkbox specific */
.checkbox-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.5rem;
  cursor: pointer;
}

.checkbox-group input {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--accent);
  cursor: pointer;
}

/* Animations */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(15px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}