/* ========================================
   DESIGN TOKENS
   ======================================== */

:root {
  /* Color Palette */
  --color-primary: #1ed760;
  --color-primary-hover: #20ee6c;
  --color-background: #0a0a0a;
  --color-surface: #181818;
  --color-surface-elevated: #1f1f1f;
  --color-border: #282828;
  --color-text-primary: #ffffff;
  --color-text-secondary: #b3b3b3;
  --color-error: #f87171;
  --color-streak-active: #f59e0b;
  --color-backdrop: rgba(0, 0, 0, 0.6);

  /* Spacing Scale */
  --space-xs: 0.5rem; /* 8px */
  --space-sm: 0.625rem; /* 10px */
  --space-md: 0.9375rem; /* 15px */
  --space-lg: 1.5rem; /* 24px */
  --space-xl: 2rem; /* 32px */
  --space-2xl: 3rem; /* 48px */
  --space-input: 0.75rem; /* 12px */
  --space-icon: 0.1875rem; /* 3px */

  /* Border Radius */
  --radius-default: 12px;

  /* Typography */
  --font-family-base: "Open Sans", sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.85rem;
  --letter-spacing-tight: 0.5px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;

  /* Layout */
  --container-max-width: 700px;
  --container-width-mobile: 95%;
  --layout-main-offset: 10vh;
  --size-control: 2.5rem; /* 40px */
  --size-album-max: 22.5rem; /* 360px */
  --size-modal-max: 25rem; /* 400px */
  --breakpoint-sm: 32.5rem; /* 520px */
}

/* ========================================
   BASE STYLES
   ======================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
}

/* Typography Reset */
h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 var(--space-sm);
  font-weight: 600;
  line-height: 1.2;
}

p {
  margin: 0;
}

/* Icon Spacing */
i {
  margin-right: var(--space-icon);
}

.skip-link {
  position: absolute;
  top: -2.5rem;
  left: var(--space-sm);
  z-index: 1000;
  padding: var(--space-xs) var(--space-sm);
  color: var(--color-text-primary);
  background-color: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-default);
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-sm);
}

/* ========================================
   LAYOUT
   ======================================== */

header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  position: relative;
  width: 100%;
  margin: 0 auto;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  max-width: min(var(--container-width-mobile), var(--container-max-width));
}

.header__center {
  grid-column: 2;
  justify-self: center;
}

.header__right {
  grid-column: 3;
  justify-self: end;
  width: var(--size-control);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: inherit;
  text-decoration: none;
}

.brand img {
  display: block;
}

.brand:focus-visible {
  outline: 1px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-default);
}

main {
  width: 100%;
  max-width: min(var(--container-width-mobile), var(--container-max-width));
  margin-top: var(--layout-main-offset);
  margin-bottom: auto;
  padding: var(--space-lg);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-default);
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

footer {
  margin-top: var(--space-xl);
  padding-bottom: var(--font-size-base);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

footer a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

footer a:hover {
  color: var(--color-primary);
}

/* ========================================
   FORM COMPONENTS
   ======================================== */

input,
button {
  padding: var(--space-input);
  font-size: var(--font-size-base);
  border-radius: var(--radius-default);
  text-align: center;
  width: 100%;
  font-family: inherit;
}

input {
  background-color: var(--color-background);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary);
}

/* Button Base Styles */
button {
  background-color: var(--color-primary);
  color: var(--color-background);
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: background-color var(--transition-base);
}

button:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

/* Button Variants */
.btn-secondary {
  background-color: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-border);
}

.help-btn {
  margin-right: var(--space-sm);
  width: var(--size-control);
  height: var(--size-control);
  border-radius: 50%;
  display: grid;
  place-items: center;
  background-color: transparent;
  padding: 0;
  font-size: 1.5rem;
  border: none;
}

.help-btn i {
  margin: 0;
  color: var(--color-text-secondary);
}

.help-btn:hover:not(:disabled) {
  background-color: transparent;
}

.help-btn:hover i {
  color: var(--color-primary-hover);
}

/* ========================================
   GAME COMPONENTS
   ======================================== */

/* Container Layouts */
.control-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  width: 100%;
}

.audio-container {
  display: flex;
  justify-content: center;
  align-items: stretch;
  width: 100%;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.button-container {
  display: flex;
  gap: var(--space-md);
}

/* Scoreboard */
.scoreboard {
  display: flex;
  justify-content: space-around;
  gap: var(--space-md);
  padding: var(--space-md);
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-default);
}

.score-item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

/* Points Notification */
.points-notification {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -30px);
  font-size: 1.5rem;
  font-weight: 700;
  opacity: 0;
  pointer-events: none;
  white-space: nowrap;
  transition:
    opacity 0.3s ease,
    transform 0.5s ease;
}

.points-notification.show {
  opacity: 1;
  transform: translate(-50%, -40px);
}

.points-notification.positive {
  color: var(--color-primary);
}

.points-notification.negative {
  color: var(--color-error);
}

.score-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-tight);
}

.score-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.score-item.is-streak-active .score-value {
  color: var(--color-streak-active);
}

/* Album Artwork */
#album-art {
  width: 60%;
  max-width: var(--size-album-max);
  margin: 0 auto;
  border-radius: var(--radius-default);
  display: block;
  aspect-ratio: 1 / 1;
}

#album-art.is-placeholder {
  background-color: var(--color-border);
}

/* Skip Button */
#skip-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1 1 30%;
}

/* Status Message */
#status-msg {
  font-size: var(--font-size-sm);
}

/* Song Information */
#song-title {
  margin-bottom: var(--space-2xl);
}

/* Artist Header Icon */
#current-artist-header i {
  color: var(--color-primary);
}

#new-game-btn {
  margin-top: var(--space-lg);
}

/* ========================================
   MODAL STYLES
   ======================================== */

.modal {
  position: fixed;
  inset: 0;
  background: var(--color-backdrop);
  display: none;
  place-items: center;
  z-index: 1000;
  padding: var(--space-lg);
}

.modal.is-open {
  display: grid;
}

.modal-content {
  background-color: var(--color-surface);
  padding: var(--space-lg);
  border-radius: var(--radius-default);
  border: 1px solid var(--color-border);
  max-width: var(--size-modal-max);
  width: 90%;
  text-align: left;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.45);
  animation: modal-fade-in 0.2s ease;
}

.modal-header {
  text-align: left;
  margin-bottom: var(--space-md);
}

.modal-lead {
  color: var(--color-text-secondary);
}

.modal-steps {
  list-style: none;
  padding: 0;
  margin: var(--space-md) 0 var(--space-lg);
  display: grid;
  gap: var(--space-sm);
}

.modal-steps li {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm);
  background-color: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  line-height: 1.35;
}

.step-icon {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  color: var(--color-primary);
  font-size: 0.95rem;
  flex: 0 0 34px;
  line-height: 1;
}

.step-icon i {
  margin: 0;
  line-height: 1;
}

.modal-meta {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.modal-card {
  padding: var(--space-md);
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: 10px;
}

.modal-card h3 {
  margin-bottom: var(--space-xs);
  font-size: 1rem;
}

.modal-card p {
  color: var(--color-text-secondary);
}

.modal-tips {
  margin: 0;
  padding-left: var(--space-lg);
  color: var(--color-text-secondary);
}

kbd {
  font-family: inherit;
  font-size: 0.85rem;
  padding: 0.1rem 0.35rem;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
}

.close-btn {
  width: 100%;
}

@keyframes modal-fade-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

/* Display Utilities */
.is-hidden {
  display: none !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Text Color Utilities */
.text-secondary,
.is-info {
  color: var(--color-text-secondary);
}

.text-error,
.is-error {
  color: var(--color-error);
}

.text-success,
.is-success {
  color: var(--color-primary);
}

/* ========================================
   THIRD-PARTY OVERRIDES
   ======================================== */

/* Plyr Audio Player Customization */
.plyr {
  --plyr-color-main: var(--color-primary);
  --plyr-audio-controls-background: var(--color-background);
  --plyr-audio-control-color: var(--color-text-secondary);
  flex: 1 1 70%;
}

.plyr--audio {
  border-radius: var(--radius-default);
  border: 1px solid var(--color-border);
}

/* Mobile layout tweaks to stop the Skip button wrapping */
@media (max-width: 32.5rem) {
  .audio-container {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-sm);
  }

  .plyr {
    flex: 1 1 auto;
    width: 100%;
    min-width: 0;
  }

  #skip-btn {
    flex: 0 0 auto;
    width: 100%;
  }

  .modal-meta {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   STATE-DEPENDENT VISIBILITY
   ======================================== */

/* Initially Hidden Elements */
#game-container,
#next-btn,
#album-art,
#song-title,
#song-artist,
#end-game-screen {
  display: none;
}