:root {
  /* Colors */
  --color-primary: #ffdc40;
  --color-background: #000000;
  --color-surface: #000;
  --color-surface-hover: #f7ffd8;
  --color-text-primary: #333333;
  --color-text-on-primary: #000;
  --color-text-on-overlay: #ffdc40;
  --color-text-on-color-surface: #fff;
  --color-overlay-background: rgba(000, 000, 000, 0.8);
  --color-waveform: #10aea6;
  --color-playhead: #e05d4f;

  /* Typography */
  --font-family: sans-serif;
  --header-font-size: 1rem;
  --body-font-size: 1rem;

  /* Sizing */
  --header-height: 2rem;
  --spacing-unit: 1rem;
}

/* ================================================================= */
/* Global & Utilities                                                */
/* ================================================================= */
* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-background);
  color: var(--color-text-primary);
  margin: 0;
}

.hidden {
  display: none !important;
}

/* ================================================================= */
/* Layout                                                            */
/* ================================================================= */
.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 var(--spacing-unit);
  background-color: var(--color-primary);
  color: var(--color-text-on-primary);
}

.header h1 {
  font-size: var(--header-font-size);
  margin: 0;
}

.main-content {
  flex-grow: 1;
  overflow: hidden; /* Ensures the grid doesn't overflow the page */
}

/* ================================================================= */
/* Components                                                        */
/* ================================================================= */

/* --- Overlay --- */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-overlay-background);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  color: var(--color-text-on-overlay);
}

.overlay__content {
  text-align: center;
}

.overlay__title {
  font-size: 2rem;
  margin-bottom: var(--spacing-unit);
}

/* --- Button --- */
.button {
  padding: 0.8em 1.2em;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: var(--body-font-size);
  background-color: var(--color-background);
  color: var(--color-surface);
  margin: 0.5em;
}

.button--primary {
  background-color: var(--color-primary);
  color: var(--color-text-on-primary);
}

/* --- Menu --- */
.menu {
  position: relative;
}

.menu__button {
  background: none;
  border: none;
  color: var(--color-text-on-primary);
  font-size: 1.5rem;
  cursor: pointer;
  outline: none; /* Remove focus outline on click */
}

.menu__dropdown {
  position: absolute;
  top: 100%;
  right: calc(var(--spacing-unit) * -1);
  background-color: var(--color-primary);
  z-index: 100;
  padding: 0.5em;
}

.menu__dropdown .button {
  display: block;
  width: 100%;
  margin: 0 0 0.5em 0;
  text-align: left;
  background-color: var(--color-surface);
  color: var(--color-text-on-color-surface);
  text-decoration: none;
  white-space: nowrap;
}

.menu__dropdown .button:last-child {
  margin-bottom: 0;
}

.menu__dropdown .button .fa-brands {
  margin-right: 0.5em;
  width: 1.2em; /* To align text with other buttons */
}

/* --- Sample Grid --- */
.sample-grid {
  display: grid;
  width: 100%;
  height: calc(100vh - var(--header-height));
  gap: 2px;
  border: none;
  border-radius: 0;
  overflow: hidden;
}

@media (orientation: portrait) {
  .sample-grid {
    grid-template-columns: 1fr;
    grid-template-rows: repeat(4, 1fr);
  }
}

@media (orientation: landscape) {
  .sample-grid {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(2, 1fr);
  }
}

/* --- Sample Item (Dynamically created) --- */
.sample-item {
  background-color: var(--color-surface);
  display: flex;
  flex-direction: column;
}

.waveform {
  flex-grow: 1;
  cursor: pointer;
  transition: background-color 0.2s;
}

.waveform:hover {
  background-color: var(--color-surface-hover);
}

.waveform-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.sample-settings {
  padding: var(--spacing-unit);
  background-color: var(--color-primary);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-unit);
}

.sample-settings > div {
  display: flex;
  align-items: center;
  gap: calc(var(--spacing-unit) / 2);
}

.note-input {
  width: 60px;
}

.sample-select {
  min-width: 180px;
}