/* Reset & Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background:
    radial-gradient(circle at 20% 30%, color-mix(in srgb, var(--color-accent) 8%, transparent) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, color-mix(in srgb, var(--color-secondary) 6%, transparent) 0%, transparent 50%),
    linear-gradient(135deg, #f5f7fa 0%, #e8ecf1 100%);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--transition-slow);
}

/* App Container */
.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
}

/* Floating Actions */
.floating-actions {
  position: fixed;
  top: var(--spacing-xl);
  right: var(--spacing-xl);
  display: flex;
  gap: var(--spacing-md);
  z-index: 50;
}

.icon-btn {
  width: 48px;
  height: 48px;
  background: var(--color-surface);
  border: none;
  border-radius: var(--radius-full);
  color: var(--color-text-light);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(10px);
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  -webkit-user-select: none;
}

.icon-btn:hover {
  background: var(--color-accent);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.icon-btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-md);
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl) var(--spacing-xl);
  min-height: 100vh;
}

.timer-container {
  text-align: center;
  width: 100%;
  max-width: 520px;
}

/* Mode Display */
.mode-display {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-2xl);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  transition: color var(--transition-base);
  opacity: 0.8;
}

/* Session Counter */
.session-counter {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin: var(--spacing-xl) 0 var(--spacing-md) 0;
  font-weight: 500;
  letter-spacing: 0.05em;
  opacity: 0.7;
}

/* Buttons */
.btn {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  padding: 1rem 2.5rem;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  justify-content: center;
  letter-spacing: 0.02em;
  box-shadow: var(--shadow-md);
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  -webkit-user-select: none;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  box-shadow: none;
}

.btn:not(:disabled):hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn:not(:disabled):active {
  transform: translateY(0);
  box-shadow: var(--shadow-md);
}

.btn-primary {
  background: var(--color-accent);
  color: white;
}

.btn-primary:not(:disabled):hover {
  background: #16A085;
  box-shadow: 0 8px 20px color-mix(in srgb, var(--color-accent) 30%, transparent);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 2px solid rgba(0, 0, 0, 0.08);
}

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

/* Settings and Help buttons - outline style for secondary actions */
#settingsBtn,
#helpBtn,
#fullscreenBtn {
  background: transparent;
  border: 2px solid rgba(0, 0, 0, 0.15);
}

#settingsBtn:not(:disabled):hover,
#helpBtn:not(:disabled):hover,
#fullscreenBtn:not(:disabled):hover {
  background: var(--color-surface);
  border-color: var(--color-accent);
}

/* Timer Controls */
.timer-controls {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  justify-content: center;
  align-items: center;
  margin-top: var(--spacing-lg);
}

.controls-row {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  align-items: center;
}

.btn-icon {
  width: 56px;
  padding: 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-icon svg {
  margin: 0;
}



/* Hide fullscreen button on mobile */
.fullscreen-btn-desktop {
  display: inline-flex;
}

@media (max-width: 768px) {
  .fullscreen-btn-desktop {
    display: none;
  }
}

/* Responsive */
@media (max-width: 640px) {
  .floating-actions {
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    gap: var(--spacing-sm);
  }

  .icon-btn {
    width: 44px;
    height: 44px;
  }

  .main-content {
    padding: var(--spacing-xl) var(--spacing-lg);
  }

  .timer-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    align-items: center;
  }

  .controls-row {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
  }

  .btn {
    padding: 0.875rem 2rem;
  }

  .btn-icon {
    width: 52px;
    height: 52px;
    padding: 0.875rem;
  }
}