// Package shadow provides transliteration between natural language scripts
// and the Shadow Alphabet — a phonetic writing system where one letter
// encodes one sound.
//
// The Shadow Alphabet uses 27 base letters (7 vowels + 20 consonants),
// 3 voiced forms generated by a voicing mark, standard decimal digits,
// and 5 punctuation marks built from short vertical nicks.
package shadow

// Shadow alphabet letters — the canonical representation.
// Inherited Latin/Greek letters keep their uppercase forms.
// New/borrowed letters use their Unicode symbols.
const (
	// Vowels
	A = "A"
	E = "E"
	I = "I"
	O = "O"
	U = "U"
	R = "R"
	Y = "Y"

	// Labial five-way
	P = "P"
	B = "B"
	F = "F"
	V = "V"
	M = "M"

	// Alveolar five-way
	T = "T"
	D = "D"
	S = "S"
	Z = "Z"
	N = "N"

	// Velar three-way
	K  = "K"
	G  = "G"
	Ng = "Ŋ"

	// Dental pair
	Th  = "Θ"
	Dh  = "Ð"

	// Postalveolar pair
	Sh  = "Σ"
	Zh  = "Ζ̌"

	// Affricate pair
	Ch  = "Ч"
	Dzh = "Џ"

	// Singletons
	H = "H"
	L = "L"
	W = "W"

	// Punctuation
	Breath = "|"
	Rest   = ":"
	Rise   = ".'"
	Strike = "!."
	Branch = ":."

	// Accent (placed after the vowel it modifies)
	Accent = "'"

	// Word separator
	Space = " "
)