:root {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --secondary: #8b5cf6;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --dark: #1e293b;
  --medium: #475569;
  --light: #94a3b8;
  --background: #f8fafc;
  --background-light: #ffffff;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
  --transition: all 0.2s ease;
}

/* =============================== */
/* Global Reset & Base             */
/* =============================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', sans-serif;
  color: var(--dark);
  background: var(--background);
  line-height: 1.5;
}

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

/* =============================== */
/* Navbar                          */
/* =============================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  padding: 1rem 0;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  transition: var(--transition);
}

.navbar.scrolled {
  padding: 0.75rem 0;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

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

.logo {
  display: flex;
  align-items: center;
  font-family: 'Poppins', sans-serif;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--medium);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 0;
  transition: var(--transition);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--primary);
  border-radius: var(--radius-full);
}

.cta-button {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  font-weight: 600;
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* =============================== */
/* Hero Section                    */
/* =============================== */
.hero {
  padding: 4rem 0 2.5rem;
  text-align: center;
  background: linear-gradient(135deg, rgba(59,130,246,0.05), rgba(139,92,246,0.05));
  margin-bottom: 2.5rem;
}

.hero h1 {
  font-family: 'Poppins', sans-serif;
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  color: var(--medium);
  font-size: 1.25rem;
  max-width: 700px;
  margin: auto;
}

/* =============================== */
/* Tool Cards                      */
/* =============================== */

.tools-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px,1fr));
  gap: 1.5rem;
}

.tool-card {
  background: var(--background-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.tool-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.tool-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
  text-align: center;
}

.tool-title {
  font-family: 'Poppins', sans-serif;
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.tool-description {
  color: var(--medium);
}

/* =============================== */
/* Tabs                            */
/* =============================== */

.tool-body {
  padding: 1.5rem;
}

.tool-tabs {
  display: flex;
  gap: 0.25rem;
  padding: 0.25rem;
  background: var(--background);
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
}

.tab-btn {
  flex: 1;
  padding: 0.8rem;
  border: none;
  background: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: 600;
  color: var(--medium);
  transition: var(--transition);
}

.tab-btn.active {
  background: #fff;
  box-shadow: var(--shadow-sm);
  color: var(--primary);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* =============================== */
/* Color Inputs / Pickers          */
/* =============================== */

.color-input-group {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.color-input-wrapper {
  flex: 1;
  min-width: 200px;
}

.color-input-label {
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.color-input {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.color-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.2);
}

/* Preview Box */
.color-preview {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

/* =============================== */
/* Image Upload Area               */
/* =============================== */

.upload-area {
  border: 2px dashed var(--border);
  padding: 2.5rem;
  text-align: center;
  border-radius: var(--radius-md);
  background: var(--background);
  cursor: pointer;
  transition: var(--transition);
}

.upload-area:hover {
  background: #f1f5f9;
  border-color: var(--primary);
}

.upload-icon {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

/* Image Preview */
.image-preview-container {
  margin: 1.5rem 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #f1f5f9;
  box-shadow: var(--shadow-md);
}

.image-preview {
  width: 100%;
  display: block;
  cursor: crosshair;
}

/* =============================== */
/* END CSS                         */
/* =============================== */