:root {
  --bg-gradient-light: linear-gradient(to right, #f0f4ff, #dbe9ff);
  --bg-gradient-dark: linear-gradient(to right, #1a1a1a, #2c2c2c);
  --text-color-light: #333;
  --text-color-dark: #f0f0f0;
  --font-family: 'Segoe UI', sans-serif;
}

[data-theme="light"] {
  --bg-gradient: var(--bg-gradient-light);
  --text-color: var(--text-color-light);
}

[data-theme="dark"] {
  --bg-gradient: var(--bg-gradient-dark);
  --text-color: var(--text-color-dark);
}

body {
  font-family: var(--font-family);
  background: var(--bg-gradient);
  padding: 30px;
  color: var(--text-color);
  transition: background 0.4s ease, color 0.4s ease;
}


h1 {
  font-size: 2em;
  margin-bottom: 10px;
  text-align: center;
}

button {
  background: #0078d7;
  color: white;
  border: 1px solid #005fa3; /* subtle border */
  padding: 10px 20px;
  margin: 5px;
  font-size: 16px;
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.4s ease, box-shadow 0.4s ease;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15); /* soft shadow */
  touch-action: manipulation; /* faster tap response */
}

#controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin: 20px 0;
}

#controls button {
  min-width: 200px;
  text-align: center;
}



button:hover {
  background: #005fa3;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.2);
}

button:active {
  transform: scale(0.98);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

#themeToggle:hover {
  transform: scale(1.1);
  cursor: pointer;
}

#themeToggle {
  background: none;
  border: none;
  font-size: 1.5rem;
  padding: 10px;
  border-radius: 50%;
  transition: background-color 0.3s ease, transform 0.3s ease;
}

#themeIcon {
  display: inline-block;
  transition: transform 0.3s ease;
}
#themeToggle:active #themeIcon {
  transform: rotate(180deg);
}

[data-theme="dark"] #themeIcon {
  color: #00bcd4;
}
[data-theme="light"] #themeIcon {
  color: #0078d7;
}


.favorite {
  color: gold;
  cursor: pointer;
  font-size: 20px;
}

#results {
  opacity: 1;
  transition: opacity 0.5s ease;
}

#results.fade-out {
  opacity: 0;
}

#spinner {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
}

.loader {
  border: 6px solid #f3f3f3;
  border-top: 6px solid #0078d7;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.roll {
  display: inline-block;
  animation: rollIn 0.6s ease-out;
}

@keyframes rollIn {
  0% { transform: translateY(-20px); opacity: 0; }
  100% { transform: translateY(0); opacity: 1; }
}


.line {
  background: #fff;
  padding: 10px;
  margin: 5px 0;
  border-left: 5px solid #0078d7;
  font-weight: bold;
  display: flex;
  justify-content: space-between;
  align-items: center;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

[data-theme="dark"] .line {
  background: #2a2a2a;
  border-left-color: #00bcd4;
}


.line.visible {
  opacity: 1;
  transform: translateY(0);
}

.line span {
  flex-grow: 1;
}


#splash {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: #0078d7;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 2em;
  z-index: 100;
  animation: fadeSplash 2s forwards;
}

@keyframes fadeSplash {
  0% { opacity: 1; }
  100% { opacity: 0; visibility: hidden; }
}

.spinner-fade {
  opacity: 0;
  transition: opacity 0.5s ease;
}

@media (max-width: 600px) {
  body {
    padding: 15px;
  }

  h1 {
    font-size: 1.5em;
  }

  #controls {
    flex-direction: column;
    align-items: center;
  }

  #controls button {
    width: 100%;
    max-width: 300px;
    font-size: 15px;
  }

  .line {
    flex-direction: column;
    align-items: flex-start;
    font-size: 1em;
  }

  .roll {
    margin: 2px;
    padding: 4px 6px;
    font-size: 14px;
  }

  #splash {
    font-size: 1.5em;
    padding: 20px;
    text-align: center;
  }

  .loader {
    width: 30px;
    height: 30px;
    border-width: 4px;
  }
}