* {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  background-color: var(--bg, #f3f4f6); 
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

/* Phone Container */
.phone-container {
  width: 18rem; /* iPhone width */
  height: 37rem; /* iPhone height */
  background: linear-gradient(to bottom, var(--bg-phone-start, #dbeafe), var(--bg-phone-end, #bfdbfe));
  border: 2px solid var(--border, #93c5fd);
  border-radius: 3rem;
  box-shadow: 1rem 1rem 6rem rgba(0, 0, 0, 0.4), 0 0 0.1rem rgba(0, 0, 0, 0.4);
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease; /* Smooth theme switch */
}

.phone-screen {
  width: 100%;
  height: 100%;
  background-color: var(--bg-screen, #000); /* Theme-aware */
  border-radius: 3rem;
  padding: 0.5rem;
  box-sizing: border-box;
  position: relative;
}

/* Side Buttons */
.side-button {
  width: 0.25rem;
  height: 3rem;
  background: linear-gradient(to right, var(--side-btn-start, #9ca3af), var(--side-btn-end, #bfdbfe), var(--side-btn-end, #bfdbfe));
  border-right: 1px solid var(--border, #dbeafe);
  box-shadow: inset 2px 0 1px rgba(0, 0, 0, 0.2);
  position: absolute;
  right: -0.25rem;
  transition: all 0.3s ease;
}

.side-button.volume-up { top: 20%; }
.side-button.volume-down { top: 30%; }

.side-button.lock-button {
  width: 0.25rem;
  height: 4rem;
  background: linear-gradient(to left, var(--side-btn-start, #9ca3af), var(--side-btn-end, #bfdbfe), var(--side-btn-end, #bfdbfe));
  border-left: 1px solid var(--border, #dbeafe);
  left: -0.25rem;
  top: 40%;
}

/* Status Bar */
.status-bar {
  width: 100%;
  height: 3rem;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0.5rem 1.3rem;
  color: var(--text-color, #fff);
  font-size: 0.9rem;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 10;
}

/* Island */
.island {
  width: 5rem;
  height: 1.5rem;
  background: rgba(0, 0, 0, 0.916);
  backdrop-filter: blur(10px);
  border-radius: 9999px;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  margin-top: 0.6rem;
  transition: all 0.3s ease;
}