*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: #121213;
    color: #ffffff;
    font-family: 'Clear Sans', 'Helvetica Neue', Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

header {
    width: 100%;
    max-width: 500px;
    border-bottom: 1px solid #3a3a3c;
    padding: 16px;
    text-align: center;
}

h1 {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 0.25rem;
    text-transform: uppercase;
}

.subtitle {
    font-size: 0.75rem;
    color: #818384;
    margin-top: 6px;
    letter-spacing: 0.05rem;
}

.board {
    display: grid;
    grid-template-rows: repeat(6, 62px);
    gap: 5px;
    width: 330px;
}

.row {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 5px;
}

.tile {
    width: 100%;
    height: 62px;
    border: 2px solid #3a3a3c;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2rem;
    font-weight: 700;
    text-transform: uppercase;
    user-select: none;
    color: #ffffff;
}

.tile.state-absent  { background-color: #3a3a3c; border-color: #3a3a3c; }
.tile.state-present { background-color: #b59f3b; border-color: #b59f3b; }
.tile.state-correct { background-color: #538d4e; border-color: #538d4e; }

.guess-row {
    display: flex;
    gap: 10px;
    width: 100%;
    max-width: 330px;
}

#guess-input {
    flex: 1;
    background-color: #1a1a1b;
    border: 2px solid #565758;
    color: #ffffff;
    padding: 12px 14px;
    font-size: 1.25rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.25rem;
    outline: none;
    text-align: center;
    border-radius: 4px;
    transition: border-color 0.15s ease;
}

#guess-input::placeholder {
    color: #565758;
    letter-spacing: 0.1rem;
    font-weight: 400;
}

#guess-input:focus    { border-color: #818384; }
#guess-input:disabled { opacity: 0.4; cursor: not-allowed; }

#submit-button {
    background-color: #538d4e;
    color: #ffffff;
    border: none;
    padding: 12px 18px;
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08rem;
    cursor: pointer;
    border-radius: 4px;
    transition: background-color 0.15s ease;
    white-space: nowrap;
}

#submit-button:hover:not(:disabled) { background-color: #6aaf63; }
#submit-button:disabled             { background-color: #3a3a3c; cursor: not-allowed; }

.error-message {
    font-size: 0.75rem;
    color: #cf4d4d;
    height: 1rem;
    letter-spacing: 0.03rem;
}