/* reset & fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --primary: #667eea;
  --text-dark: #2d3748;
  --text-light: #718096;
  --radius: 0 20px 0 20px;
  --transition: all 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Inter", sans-serif;
}

body {
  background: var(--gradient);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.container {
  background: #fff;
  border-radius: 0 1.5rem 0 1.5rem;
  padding: 1.8rem;
  width: 100%;
  max-width: 700px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

h1 {
  text-align: center;
  margin-bottom: 1.2rem;
  color: var(--text-dark);
  position: relative;
  padding-bottom: 0.4rem;
  font: 700 1.75rem/1 "Inter", sans-serif;
  letter-spacing: -0.5px;
}

h1::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), #764ba2);
  border-radius: 2px;
}

#generate-btn {
  background: var(--gradient);
  color: #fff;
  border: none;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 600;
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
  letter-spacing: 0.3px;
  transition: var(--transition);
}

#generate-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 15px rgba(102, 126, 234, 0.4);
}

#generate-btn:active {
  transform: translateY(0);
}

.palette-container {
  /* display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(115px, 1fr)); */

  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.color-box {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
}

.color-box:hover {
  transform: translateY(-8px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.color {
  height: 100px;
  cursor: pointer;
}

.color-info {
  background: #fff;
  padding: 0.6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
}

.hex-value {
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--text-dark);
}

.copy-btn {
  cursor: pointer;
  color: var(--text-light);
  transition: all 0.2s;
  font-size: 0.95rem;
}

.copy-btn:hover {
  color: var(--primary);
  transform: scale(1.1);
}

@media (max-width: 768px) {
  .palette-container {
    grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
  }

  .container {
    padding: 1.2rem;
  }

  h1 {
    font-size: 1.5rem;
  }

  #generate-btn {
    display: block;
    margin: 0 auto 1.5rem auto;
  }
}